ASTM A511/A511M-15

Standard Specification for Seamless Stainless Steel Mechanical Tubing

ABSTRACT
This specification covers seamless stainless tubing for use in mechanical applications where corrosion-resistant or high-temperature strength is needed. The steel may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The tubes shall be made by a seamless process and by either cold working or hot working as specified. Seamless steel tubing is a tubular product made without a welded seam. It is usually manufactured by hot working steel and then cold finishing the hot-worked tubing to produce the desired shape, dimensions and properties All austenitic tubes shall be furnished in the annealed condition. An analysis of each heat of steel shall be made to determine the percentages of the elements specified. If secondary melting processes are employed, the heat analysis shall be obtained from one remelted ingot or the product of one remelted ingot of each primary melt.
SCOPE
1.1 This specification covers seamless stainless tubing for use in mechanical applications where corrosion-resistant or high-temperature strength is needed. The grades covered are listed in Table 1, Table 2, and Table 3. (A) For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040 % carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness).(B) Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements.(C) The range of (Al + Ti) shall be within 0.85–1.20 %.  (A) MT446-2 is a lower carbon version of MT446-1, that has a lower tensile strength but improved ductility and toughness.(B) Carbon plus nitrogen = 0.025 max %.  (A) Maximum, unless a range or minimum is indicated. Where ellipses (…) appear in this table, there is no requirement and analysis for the element need not be determined or reported.(B) % Cr + 3.3 X % Mo + 16X % N ≥ 40.  
1.2 This specification covers seamless cold-finished mechanical tubing and seamless hot-finished mechanical tubing in sizes up to 123/4 in. [325 mm] in outside nominal diameter (for round tubing) with wall thicknesses as required.  
1.3 Tubes shall be furnished in one of the following shapes, as specified by the purchaser: round, square, rectangular, or special.  
1.4 Optional supplementary requirements are provided and when desired, shall be stated in the order.  
1.5 The values stated in inch-pound units are to be regarded as the standard. Within the text, the SI units are shown in square brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.

General Information

• Status: Historical
• Publication Date: 31-Dec-2014
• ICS: 23.040.10 - Iron and steel pipes
• ICS: 23.040.40 - Metal fittings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.10 - Stainless and Alloy Steel Tubular Products

Relations

• Replaces: ASTM A511/A511M-12 - Standard Specification for Seamless Stainless Steel Mechanical Tubing
• Effective Date: 01-Jan-2015
• Replaced By: ASTM A511/A511M-15a - Standard Specification for Seamless Stainless Steel Mechanical Tubing
• Effective Date: 01-May-2015
• Referred By: ASTM A182/A182M-23 - Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
• Effective Date: 01-Jan-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A511/A511M −15
StandardSpecification for
Seamless Stainless Steel Mechanical Tubing
This standard is issued under the fixed designationA511/A511M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* of Chemical Composition (Withdrawn 1996)
2.2 Military Standards:
1.1 This specification covers seamless stainless tubing for
MIL-STD-129 Marking for Shipment and Storage
use in mechanical applications where corrosion-resistant or
MIL-STD-163SteelMillProductsPreparationforShipment
high-temperature strength is needed. The grades covered are
and Storage
listed in Table 1, Table 2, and Table 3.
2.3 Federal Standard:
1.2 This specification covers seamless cold-finished me-
Fed. Std. No. 123Marking for Shipments (CivilAgencies)
chanicaltubingandseamlesshot-finishedmechanicaltubingin
sizes up to 12 ⁄4 in. [325 mm] in outside nominal diameter (for
3. Ordering Information
round tubing) with wall thicknesses as required.
3.1 Orders for material under this specification should
1.3 Tubes shall be furnished in one of the following shapes,
include the following as required to describe the desired
as specified by the purchaser: round, square, rectangular, or
material adequately:
special.
3.1.1 Quantity (feet, mass, or number of pieces),
1.4 Optional supplementary requirements are provided and 3.1.2 Name of material (seamless stainless steel mechanical
tubing),
when desired, shall be stated in the order.
3.1.3 Form (round, square, rectangular, special, see Section
1.5 The values stated in inch-pound units are to be regarded
1),
as the standard. Within the text, the SI units are shown in
3.1.4 Dimensions (round, outside diameter and wall
square brackets.The values stated in each system are not exact
thickness, see Section 9; square and rectangular, outside
equivalents;therefore,eachsystemshallbeusedindependently
dimensions and wall thickness, see Section 10; other, specify),
of the other.
3.1.5 Length (specific or random, see 9.3),
3.1.6 Manufacture (cold- or hot-finished, see 4.5),
2. Referenced Documents
3.1.7 Grade (Section 6),
2.1 ASTM Standards:
3.1.8 Condition (annealed, as cold worked, or with special
A262Practices for Detecting Susceptibility to Intergranular
heat treatment, controlled microstructural characteristics, or
Attack in Austenitic Stainless Steels
other condition as required, see Section 5),
A370Test Methods and Definitions for Mechanical Testing
3.1.9 Surface finish (special pickling, shot blasting, or
of Steel Products
polishing, as required, see Supplementary Requirement S5),
A1016/A1016MSpecification for General Requirements for
3.1.10 Specification designation,
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
3.1.11 Report of ChemicalAnalysis, if required (Sections 7
Steel Tubes
and 8),
E59Practice for Sampling Steel and Iron for Determination
3.1.12 Individual supplementary requirements, if required,
3.1.13 End use,
3.1.14 Packaging,
3.1.15 Special marking (see 15.2),
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
3.1.16 Special packing (see 16.2), and
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.10 on Stainless and Alloy Steel Tubular Products.
3.1.17 Special requirements.
Current edition approved Jan. 1, 2015. Published January 2015. Originally
approved in 1964. Last previous edition approved in 2012 as A511/A511M–12.
DOI: 10.1520/A0511_A0511M-15.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A511/A511M−15
TABLE 1 Chemical Requirements of Austenitic Stainless Steels
Composition, %
Phos- Sul-
Other
Grade
Manga- pho- fur, Silicon,
Carbon Nickel Chromium Molybdenum Titanium Columbium Selenium Iron Elements
nese, max rus, max max
max
MT 302 0.08 to 0.20 2.00 0.040 0.030 1.00 8.0–10.0 17.0–19.0 . . . . . .
MT 303 0.15 max 2.00 0.20 0.15 min 1.00 8.0–10.0 17.0–19.0 . . . . . .
MT 303Se 0.15 max 2.00 0.040 0.040 1.00 8.0–11.0 17.0–19.0 . . . 0.12–0.2 . .
MT 304 0.08 max 2.00 0.040 0.030 1.00 8.0–11.0 18.0–20.0 . . . . . .
A
MT 304L 0.035 max 2.00 0.040 0.030 1.00 8.0–13.0 18.0–20.0 . . . . . .
MT 305 0.12 2.00 0.040 0.030 1.00 10.0–13.0 17.0–19.0 . . . . . .
MT 309S 0.08 max 2.00 0.040 0.030 1.00 12.0–15.0 22.0–24.0 . . . . . .
MT 310S 0.08 max 2.00 0.040 0.030 1.00 19.0–22.0 24.0–26.0 . . . . . .
MT 316 0.08 max 2.00 0.040 0.030 1.00 11.0–14.0 16.0–18.0 2.0–3.0 . . . . .
A
MT 316L 0.035 max 2.00 0.040 0.030 1.00 10.0–15.0 16.0–18.0 2.0–3.0 . . . . .
MT 317 0.08 max 2.00 0.040 0.030 1.00 11.0–14.0 18.0–20.0 3.0–4.0 . . . . .
MT 321 0.08 max 2.00 0.040 0.030 1.00 9.0–13.0 17.0–20.0 . 5XC – . . . .
0.60
MT 347 0.08 max 2.00 0.040 0.030 1.00 9.0–13.0 17.0–20.0 . . 10XC – 1.00 . . .
N08020 0.070 max 2.00 0.045 0.035 1.00 32.0–38.0 19.0–21.0 2.00–3.00 . 8XC – 1.00 . . Cu 3.00–4.00
N08367 0.030 max 2.00 0.040 0.030 1.00 23.5–25.5 20.0–22.0 6.00–7.00 . . . . N 0.18–0.25
Cu 0.75
B
N08800 0.10 max 1.50 0.045 0.015 1.00 30.0–35.0 19.0–23.0 . 0.15–0.60 . . 39.5 min Al 0.15–0.60
Cu 0.75
B
N08810 0.05–0.10 1.50 0.045 0.015 1.00 30.0–35.0 19.0–23.0 . 0.15–0.60 . . 39.5 min Al 0.15–0.60
Cu 0.75
C B C
N08811 0.06–0.10 1.50 0.045 0.015 1.00 30.0–35.0 19.0–23.0 . 0.25–0.60 . . 39.5 min Al 0.25–0.60
Cu 0.75
N08904 0.020 max 2.00 0.040 0.030 1.00 23.0–28.0 19.0–23.0 4.0–5.0 . . . . N 0.10
Cu 1.00–2.00
N08925 0.020 max 1.00 0.045 0.030 0.50 24.0–26.0 19.0–21.0 6.0–7.0 . . . . N 0.10–0.20
Cu 0.80–1.50
N08926 0.020 max 2.00 0.030 0.010 0.50 24.0–26.0 19.0–21.0 6.0–7.0 . . . . N 0.15–0.25
Cu 0.40–1.50
A
For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040 % carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those
under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness).
B
Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements.
C
The range of (Al + Ti) shall be within 0.85–1.20 %.

A511/A511M−15
TABLE 2 Chemical Requirements of Ferritic and Martensitic Stainless Steels
Composition, %
Manga- Phos- Sulfur,
Grade
Silicon, Molyb-
Carbon, max nese, phorus, max Nickel Chromium Aluminum Copper Nitrogen Selenium
max denum
max max
Martensitic
MT 403 0.15 1.00 0.040 0.030 0.50 0.50 max 11.5–13.0 0.60 max
MT 410 0.15 1.00 0.040 0.030 1.00 0.50 max 11.5–13.5 . . . . .
MT 414 0.15 1.00 0.040 0.030 1.00 1.25–2.50 11.5–13.5 . . . . .
MT 416Se 0.15 1.25 0.060 0.060 1.00 0.50 max 12.0–14.0 . . . . 0.12–0.20
MT 431 0.20 1.00 0.040 0.030 1.00 1.25–2.50 15.0–17.0 . . . . .
MT 440A 0.60 to 0.75 1.00 0.040 0.030 1.00 . 16.0–18.0 0.75 max . . . .
Ferritic
MT 405 0.08 1.00 0.040 0.030 1.00 0.50 max 11.5–14.5 . 0.10–0.30 . . .
MT 429 0.12 1.00 0.040 0.030 1.00 0.50 max 14.0–16.0 . . . . .
MT 430 0.12 1.00 0.040 0.030 1.00 0.50 max 16.0–18.0 . . . . .
MT 443 0.20 1.00 0.040 0.030 1.00 0.50 max 18.0–23.0 . . 0.90–1.25 . .
MT 446–1 0.20 1.50 0.040 0.030 1.00 0.50 max 23.0–30.0 . . . 0.25 max .
A
MT 446–2 0.12 1.50 0.040 0.030 1.00 0.50 max 23.0–30.0 . . . 0.25 max .
29-4 0.010 0.30 0.025 0.020 0.20 0.15 max 28.0–30.0 3.5–4.2 . 0.15 max 0.020 max .
B
29-4-2 0.010 0.30 0.025 0.020 0.20 2.0–2.5 28.0–30.0 3.5–4.2 . 0.15 max 0.020 max .
A
MT446-2 is a lower carbon version of MT446-1, that has a lower tensile strength but improved ductility and toughness.
B
Carbon plus nitrogen = 0.025 max %.
A
TABLE 3 Chemical Requirements of Austenitic-Ferritic Stainless Steels
Grade Composition, %
Carbon Manganese, Phosphorus, Sulfur, max Silicon, max Nickel Chromium Molybdenum Nitrogen Copper Others
max max
S31260 0.030 1.00 0.030 0.030 0.75 5.5–7.5 24.0–26.0 2.5–3.5 0.10–0.30 0.20–0.80 W 0.10–0.50
S31803 0.030 2.00 0.030 0.020 1.00 4.5–6.5 21.0–23.0 2.5–3.5 0.08–0.20 . .
S32101 0.040 4.0–6.0 0.040 0.030 1.00 1.35–1.70 21.0–22.0 0.10–0.80 0.20–0.25 0.10–0.80 .
S32205 0.030 2.00 0.030 0.020 1.00 4.5–6.5 22.0–23.0 3.0–3.5 0.14–0.20 . {
S32304 0.030 2.50 0.040 0.040 1.00 3.0–5.5 21.5–24.5 0.05–0.60 0.05–0.20 0.05–0.60 .
S32506 0.030 1.00 0.040 0.015 0.90 5.5–7.2 24.0–26.0 3.0–3.5 0.08–0.20 . W 0.05–0.30
S32550 0.040 1.50 0.040 0.030 1.00 4.5–6.5 24.0–27.0 2.9–3.9. 0.10–0.25 1.50–2.50 .
S32707 0.030 1.50 0.035 0.010 0.50 5.5–9.5 26.0–29.0 4.0–5.0 0.30–0.50 1.0 Co 0.5–2.0
S32750 0.030 1.20 0.035 0.020 0.80 6.0–8.0 24.0–26.0 3.0–5.0 0.24–0.32 0.50 .
B
S32760 0.05 1.00 0.030 0.010 1.00 6.0–8.0 24.0–26.0 3.0–4.0 0.20–0.30 0.50–1.00 W 0.50–1.00
S32906 0.030 0.80-1.50 0.030 0.030 0.80 5.8–7.5 28.0–30.0 1.50–2.60 0.30–0.40 0.80 .
S32808 0.030 1.10 0.030 0.010 0.50 7.0–8.2 27.0–27.9 0.80–1.20 0.30–0.40 { W 2.10–2.50
S32950 0.030 2.00 0.035 0.010 0.60 3.5–5.2 26.0–29.0 1.00–2.50 0.15–0.35 . .
S39274 0.030 1.00 0.030 0.020 0.80 6.0–8.0 24.0–26.0 2.5–3.5 0.24–0.32 0.20–0.80 W 1.50–2.50
A
Maximum, unless a range or minimum is indicated. Where ellipses ({) appear in this table, there is no requirement and analysis for the element need not be determined
or reported.
B
%Cr+3.3X%Mo+16X%N$ 40.
4. Materials and Manufacture finishing the hot-worked tubing to produce the desired shape,
dimensions, and properties.
4.1 The steel may be made by any process.
4.2 Ifaspecifictypeofmeltingisrequiredbythepurchaser, 5. Condition
it shall be as stated on the purchase order.
5.1 Roundseamlessstainlessmechanicaltubingisgenerally
4.3 The primary melting may incorporate separate degas- supplied in the cold-worked and annealed condition (see 5.2
sing or refining and may be followed by secondary melting, through 5.5). Square, rectangular, or other shapes of tubing are
such as electroslag remelting or vacuum-arc remelting. If generallysuppliedannealedpriortofinalcoldshaping.Ifsome
secondary melting is employed, the heat shall be defined as all otherconditionisdesired,detailsshallbeincludedintheorder.
of the ingots remelted from a single primary heat.
5.2 The thermal treatment for ferritic and martensitic steels
4.4 Steel may be cast in ingots or may be strand cast.When shall be performed by a method and at a temperature selected
steel of different grades is sequentially strand cast, identifica- by the manufacturer unless otherwise specified by the pur-
tion of the resultant transition material is required. The chaser.
producer shall remove the transition material by an established
5.3 Unless otherwise specified, all austenitic tubes shall be
procedure that positively separates the grades.
furnishedintheannealedcondition.Unlessotherwisespecified
4.5 The tubes shall be made by a seamless process and by in Table 4, the anneal shall consist of heating the material to a
eithercoldworkingorhotworkingasspecified.Seamlesssteel minimum temperature of 1900 °F [1040 °C] and quenching in
tubing is a tubular product made without a welded seam. It is water or rapidly cooling by other means.Alternatively, imme-
usually manufactured by hot working steel and then cold diately following hot forming while the temperature of the
A511/A511M−15
TABLE 4 Heat Treatment of Austenitic Stainless Steels
Grade Temperature °F [°C] Quench
A,B
N08020 1700–1850 [925–1010] quenched in water or rapidly cooled by other means
A
N08367 2025 [1105] quenched in water or rapidly cooled by other means
A
N08810 2050 [1120] quenched in water or rapidly cooled by other means
A
N08811 2100 [1150] quenched in water or rapidly cooled by other means
A
N08904 2000 [1100] quenched in water or rapidly cooled by other means
A
N08925 2010–2100 [1100–1150] quenched in water or rapidly cooled by other means
A
N08926 2010–2100 [1100–1150] quenched in water or rapidly cooled by other means
A
Quenched in water or rapidly cooled by other means, at a rate sufficient to prevent re-precipitation of carbides, as demonstrable by the capability of tubes, heat treated
by either separate solution annealing or by direct quenching, passing Practices A262, Practice E. The manufacture is not required to run the test unless it is specified on
the purchase order. Note that Practices A262 requires the test to be performed on sensitized specimens in the low-carbon and stabilized types and on specimens
representative of the as-shipped condition for other types. In the case of low-carbon types containing 3 % or more molybdenum, the applicability of the sensitizing treatment
prior to testing shall be a matter for negotiation between the seller and the purchaser.
B
Material shall be supplied in stabilized annealed condition.
tubesisnotlessthanthespecifiedminimumsolutiontreatment specified. When requested in the order or contract, a report of
temperature, tubes may be individually quenched in water or this analysis shall be furnished to the purchaser.
rapidly cooled by other means. This anneal shall precede final
8. Product Analysis
cold work, when cold-worked tempers are required.
8.1 Ananalysisofeitheronebilletoronetubeshallbemade
5.4 All austenitic-ferritic tubes shall be furnished in the
for each heat of steel. Samples for chemical analysis, except
annealed condition as prescribed in Table 5. Alternatively,
spectrochemical analysis, shall be taken in accordance with
immediately following hot forming, while the temperature of
Method E59. The chemical composition thus determined shall
the tubes is not less than the specified minimum solution
conform to the requirements specified in Section 6.
treatment temperature, tubes may be individually quenched in
8.2 If the original test for product an
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A511/A511M − 12 A511/A511M − 15
Standard Specification for
Seamless Stainless Steel Mechanical Tubing
This standard is issued under the fixed designation A511/A511M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers seamless stainless tubing for use in mechanical applications where corrosion-resistant or
high-temperature strength is needed. The grades covered are listed in Table 1, Table 2, and Table 3.
1.2 This specification covers seamless cold-finished mechanical tubing and seamless hot-finished mechanical tubing in sizes up
to 12 ⁄4 in. [325 mm] in outside nominal diameter (for round tubing) with wall thicknesses as required.
1.3 Tubes shall be furnished in one of the following shapes, as specified by the purchaser: round, square, rectangular, or special.
1.4 Optional supplementary requirements are provided and when desired, shall be stated in the order.
1.5 The values stated in inch-pound units are to be regarded as the standard. Within the text, the SI units are shown in square
brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the
other.
2. Referenced Documents
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel
Tubes
E59 Practice for Sampling Steel and Iron for Determination of Chemical Composition (Withdrawn 1996)
2.2 Military Standards:
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Shipment and Storage
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Ordering Information
3.1 Orders for material under this specification should include the following as required to describe the desired material
adequately:
3.1.1 Quantity (feet, mass, or number of pieces),
3.1.2 Name of material (seamless stainless steel mechanical tubing),
3.1.3 Form (round, square, rectangular, special, see Section 1),
3.1.4 Dimensions (round, outside diameter and wall thickness, see Section 9; square and rectangular, outside dimensions and
wall thickness, see Section 10; other, specify),
3.1.5 Length (specific or random, see 9.3),
3.1.6 Manufacture (cold- or hot-finished, see 4.5),
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.10
on Stainless and Alloy Steel Tubular Products.
Current edition approved March 1, 2012Jan. 1, 2015. Published April 2012January 2015. Originally approved in 1964. Last previous edition approved in 20112012 as
A511/A511M–11.–12. DOI: 10.1520/A0511_A0511M-12.10.1520/A0511_A0511M-15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A511/A511M − 15
TABLE 1 Chemical Requirements of Austenitic Stainless Steels
Composition, %
Phos- Sul- Columbium
Grade
Manga- pho- fur, Silicon, plus Selenium
Carbon Nickel Chromium Molybdenum Titanium
nese, max rus, max max Tantalum
max
MT 302 0.08 to 0.20 2.00 0.040 0.030 1.00 8.0–10.0 17.0–19.0 . . . .
MT 303 0.15 max 2.00 0.20 0.15 min 1.00 8.0–10.0 17.0–19.0 . . . .
MT 303Se 0.15 max 2.00 0.040 0.040 1.00 8.0–11.0 17.0–19.0 . . . 0.12–0.2
MT 304 0.08 max 2.00 0.040 0.030 1.00 8.0–11.0 18.0–20.0 . . . .
A
MT 304L 0.035 max 2.00 0.040 0.030 1.00 8.0–13.0 18.0–20.0 . . . .
MT 305 0.12 2.00 0.040 0.030 1.00 10.0–13.0 17.0–19.0 . . . .
MT 309S 0.08 max 2.00 0.040 0.030 1.00 12.0–15.0 22.0–24.0 . . . .
MT 310S 0.08 max 2.00 0.040 0.030 1.00 19.0–22.0 24.0–26.0 . . . .
MT 316 0.08 max 2.00 0.040 0.030 1.00 11.0–14.0 16.0–18.0 2.0–3.0 . . .
A
MT 316L 0.035 max 2.00 0.040 0.030 1.00 10.0–15.0 16.0–18.0 2.0–3.0 . . .
MT 317 0.08 max 2.00 0.040 0.030 1.00 11.0–14.0 18.0–20.0 3.0–4.0 . . .
B
MT 321 0.08 max 2.00 0.040 0.030 1.00 9.0–13.0 17.0–20.0 . . .
C
MT 347 0.08 max 2.00 0.040 0.030 1.00 9.0–13.0 17.0–20.0 . . .
TABLE 1 Chemical Requirements of Austenitic Stainless Steels
Composition, %
Phos- Sul-
Other
Grade
Manga- pho- fur, Silicon,
Carbon Nickel Chromium Molybdenum Titanium Columbium Selenium Iron Elements
nese, max rus, max max
max
MT 302 0.08 to 0.20 2.00 0.040 0.030 1.00 8.0–10.0 17.0–19.0 . . . . . .
MT 303 0.15 max 2.00 0.20 0.15 min 1.00 8.0–10.0 17.0–19.0 . . . . . .
MT 303Se 0.15 max 2.00 0.040 0.040 1.00 8.0–11.0 17.0–19.0 . . . 0.12–0.2 . .
MT 304 0.08 max 2.00 0.040 0.030 1.00 8.0–11.0 18.0–20.0 . . . . . .
A
MT 304L 0.035 max 2.00 0.040 0.030 1.00 8.0–13.0 18.0–20.0 . . . . . .
MT 305 0.12 2.00 0.040 0.030 1.00 10.0–13.0 17.0–19.0 . . . . . .
MT 309S 0.08 max 2.00 0.040 0.030 1.00 12.0–15.0 22.0–24.0 . . . . . .
MT 310S 0.08 max 2.00 0.040 0.030 1.00 19.0–22.0 24.0–26.0 . . . . . .
MT 316 0.08 max 2.00 0.040 0.030 1.00 11.0–14.0 16.0–18.0 2.0–3.0 . . . . .
A
MT 316L 0.035 max 2.00 0.040 0.030 1.00 10.0–15.0 16.0–18.0 2.0–3.0 . . . . .
MT 317 0.08 max 2.00 0.040 0.030 1.00 11.0–14.0 18.0–20.0 3.0–4.0 . . . . .
MT 321 0.08 max 2.00 0.040 0.030 1.00 9.0–13.0 17.0–20.0 . 5XC – . . . .
0.60
MT 347 0.08 max 2.00 0.040 0.030 1.00 9.0–13.0 17.0–20.0 . . 10XC – 1.00 . . .
N08020 0.070 max 2.00 0.045 0.035 1.00 32.0–38.0 19.0–21.0 2.00–3.00 . 8XC – 1.00 . . Cu 3.00–4.00
N08367 0.030 max 2.00 0.040 0.030 1.00 23.5–25.5 20.0–22.0 6.00–7.00 . . . . N 0.18–0.25
Cu 0.75
B
N08800 0.10 max 1.50 0.045 0.015 1.00 30.0–35.0 19.0–23.0 . 0.15–0.60 . . 39.5 min Al 0.15–0.60
Cu 0.75
B
N08810 0.05–0.10 1.50 0.045 0.015 1.00 30.0–35.0 19.0–23.0 . 0.15–0.60 . . 39.5 min Al 0.15–0.60
Cu 0.75
C B C
N08811 0.06–0.10 1.50 0.045 0.015 1.00 30.0–35.0 19.0–23.0 . 0.25–0.60 . . 39.5 min Al 0.25–0.60
Cu 0.75
N08904 0.020 max 2.00 0.040 0.030 1.00 23.0–28.0 19.0–23.0 4.0–5.0 . . . . N 0.10
Cu 1.00–2.00
N08925 0.020 max 1.00 0.045 0.030 0.50 24.0–26.0 19.0–21.0 6.0–7.0 . . . . N 0.10–0.20
Cu 0.80–1.50
N08926 0.020 max 2.00 0.030 0.010 0.50 24.0–26.0 19.0–21.0 6.0–7.0 . . . . N 0.15–0.25
Cu 0.40–1.50
A
For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040 % carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those
under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness).
B
The titanium content shall be not less than five times the carbon content and not more than 0.60 %. Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements.

A511/A511M − 15
C
The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.00 %.range of (Al + Ti) shall be within 0.85–1.20 %.

A511/A511M − 15
TABLE 2 Chemical Requirements of Ferritic and Martensitic Stainless Steels
Composition, %
Manga- Phos- Sulfur,
Grade
Silicon, Molyb-
Carbon, max nese, phorus, max Nickel Chromium Aluminum Copper Nitrogen Selenium
max denum
max max
Martensitic
MT 403 0.15 1.00 0.040 0.030 0.50 0.50 max 11.5–13.0 0.60 max
MT 410 0.15 1.00 0.040 0.030 1.00 0.50 max 11.5–13.5 . . . . .
MT 414 0.15 1.00 0.040 0.030 1.00 1.25–2.50 11.5–13.5 . . . . .
MT 416Se 0.15 1.25 0.060 0.060 1.00 0.50 max 12.0–14.0 . . . . 0.12–0.20
MT 431 0.20 1.00 0.040 0.030 1.00 1.25–2.50 15.0–17.0 . . . . .
MT 440A 0.60 to 0.75 1.00 0.040 0.030 1.00 . 16.0–18.0 0.75 max . . . .
Ferritic
MT 405 0.08 1.00 0.040 0.030 1.00 0.50 max 11.5–14.5 . 0.10–0.30 . . .
MT 429 0.12 1.00 0.040 0.030 1.00 0.50 max 14.0–16.0 . . . . .
MT 430 0.12 1.00 0.040 0.030 1.00 0.50 max 16.0–18.0 . . . . .
MT 443 0.20 1.00 0.040 0.030 1.00 0.50 max 18.0–23.0 . . 0.90–1.25 . .
MT 446–1 0.20 1.50 0.040 0.030 1.00 0.50 max 23.0–30.0 . . . 0.25 max .
A
MT 446–2 0.12 1.50 0.040 0.030 1.00 0.50 max 23.0–30.0 . . . 0.25 max .
29-4 0.010 0.30 0.025 0.020 0.20 0.15 max 28.0–30.0 3.5–4.2 . 0.15 max 0.020 max .
B
29-4-2 0.010 0.30 0.025 0.020 0.20 2.0–2.5 28.0–30.0 3.5–4.2 . 0.15 max 0.020 max .
A
MT446-2 is a lower carbon version of MT446-1, that has a lower tensile strength but improved ductility and toughness.
B
Carbon plus nitrogen = 0.025 max %.
A
TABLE 3 Chemical Requirements of Austenitic-Ferritic Stainless Steels
Grade Composition, %
Carbon Manganese, Phosphorus, Sulfur, max Silicon, max Nickel Chromium Molybdenum Nitrogen Copper Others
max max
S31260 0.030 1.00 0.030 0.030 0.75 5.5–7.5 24.0–26.0 2.5–3.5 0.10–0.30 0.20–0.80 W 0.10–0.50
S31803 0.030 2.00 0.030 0.020 1.00 4.5–6.5 21.0–23.0 2.5–3.5 0.08–0.20 . .
S32101 0.040 4.0–6.0 0.040 0.030 1.00 1.35–1.70 21.0–22.0 0.10–0.80 0.20–0.25 0.10–0.80 .
S32205 0.030 2.00 0.030 0.020 1.00 4.5–6.5 22.0–23.0 3.0–3.5 0.14–0.20 . {
S32304 0.030 2.50 0.040 0.040 1.00 3.0–5.5 21.5–24.5 0.05–0.60 0.05–0.20 0.05–0.60 .
S32506 0.030 1.00 0.040 0.015 0.90 5.5–7.2 24.0–26.0 3.0–3.5 0.08–0.20 . W 0.05–0.30
S32550 0.040 1.50 0.040 0.030 1.00 4.5–6.5 24.0–27.0 2.9–3.9. 0.10–0.25 1.50–2.50 .
S32707 0.030 1.50 0.035 0.010 0.50 5.5–9.5 26.0–29.0 4.0–5.0 0.30–0.50 1.0 Co 0.5–2.0
S32750 0.030 1.20 0.035 0.020 0.80 6.0–8.0 24.0–26.0 3.0–5.0 0.24–0.32 0.50 .
B
S32760 0.05 1.00 0.030 0.010 1.00 6.0–8.0 24.0–26.0 3.0–4.0 0.20–0.30 0.50–1.00 W 0.50–1.00
S32906 0.030 0.80-1.50 0.030 0.030 0.80 5.8–7.5 28.0–30.0 1.50–2.60 0.30–0.40 0.80 .
S32808 0.030 1.10 0.030 0.010 0.50 7.0–8.2 27.0–27.9 0.80–1.20 0.30–0.40 { W 2.10–2.50
S32950 0.030 2.00 0.035 0.010 0.60 3.5–5.2 26.0–29.0 1.00–2.50 0.15–0.35 . .
S39274 0.030 1.00 0.030 0.020 0.80 6.0–8.0 24.0–26.0 2.5–3.5 0.24–0.32 0.20–0.80 W 1.50–2.50
A
Maximum, unless a range or minimum is indicated. Where ellipses ({) appear in this table, there is no requirement and analysis for the element need not be determined
or reported.
B
% Cr + 3.3 X % Mo + 16X % N $ 40.
3.1.7 Grade (Section 6),
3.1.8 Condition (annealed, as cold worked, or with special heat treatment, controlled microstructural characteristics, or other
condition as required, see Section 5),
3.1.9 Surface finish (special pickling, shot blasting, or polishing, as required, see Supplementary Requirement S5),
3.1.10 Specification designation,
3.1.11 Report of Chemical Analysis, if required (Sections 7 and 8),
3.1.12 Individual supplementary requirements, if required,
3.1.13 End use,
3.1.14 Packaging,
3.1.15 Special marking (see 15.2),
3.1.16 Special packing (see 16.2), and
3.1.17 Special requirements.
4. Materials and Manufacture
4.1 The steel may be made by any process.
4.2 If a specific type of melting is required by the purchaser, it shall be as stated on the purchase order.
4.3 The primary melting may incorporate separate degassing or refining and may be followed by secondary melting, such as
electroslag remelting or vacuum-arc remelting. If secondary melting is employed, the heat shall be defined as all of the ingots
remelted from a single primary heat.
A511/A511M − 15
4.4 Steel may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification
of the resultant transition material is required. The producer shall remove the transition material by an established procedure that
positively separates the grades.
4.5 The tubes shall be made by a seamless process and by either cold working or hot working as specified. Seamless steel tubing
is a tubular product made without a welded seam. It is usually manufactured by hot working steel and then cold finishing the
hot-worked tubing to produce the desired shape, dimensions, and properties.
5. Condition
5.1 Round seamless stainless mechanical tubing is generally supplied in the cold-worked and annealed condition (see 5.2
through 5.5). Square, rectangular, or other shapes of tubing are generally supplied annealed prior to final cold shaping. If some
other condition is desired, details shall be included in the order.
5.2 The thermal treatment for ferritic and martensitic steels shall be performed by a method and at a temperature selected by
the manufacturer unless otherwise specified by the purchaser.
5.3 Unless otherwise specified, all austenitic tubes shall be furnished in the annealed condition. The Unless otherwise specified
in Table 4, the anneal shall consist of heating the material to a minimum temperature of 1900 °F [1040 °C] and quenching in water
or rapidly cooling by other means. Alternatively, immediately following hot forming while the temperature of the tubes is not less
than the specified minimum solution treatment temperature, tubes may be individually quenched in water or rapidly cooled by other
means. This anneal shall precede final cold work, when cold-worked tempers are required.
5.4 All austenitic-ferritic tubes shall be furnished in the annealed condition as prescribed in Table 45. Alternatively, immediately
following hot forming, while the temperature of the tubes is not less than the specified minimum solution treatment t
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