ASTM A512-06(2012)
(Specification)Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
ABSTRACT
This specification covers cold-drawn buttweld carbon steel tubes for use as round, square, rectangular or special shape mechanical tubing. The carbon steel can be made unless a specific type of melting process is required by the purchaser. Heat and product analysis shall be made to determine the specified percentages of chemical elements to which steel tubes shall conform to. The tubing shall be free of injurious defects and shall have a workmanlike finish. Unless otherwise specified, both outside and inside surfaces of the tubing shall be coated with a film of rust-retarding oil before shipping.
SCOPE
1.1 This specification covers cold-drawn buttweld carbon steel tubes for use as mechanical tubing.
1.2 This specification covers round, square, rectangular, and special shape mechanical tubing.
1.3 Round tube size ranges covered are outside diameters up to 3 1/2 in. (88.9 mm) and wall thickness from 0.035 to 0.500 in. (0.89 to 12.70 mm).
1.4 Optional supplementary requirements are provided and, when desired, shall be so stated in the order.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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Standards Content (Sample)
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Designation:A512 −06 (Reapproved 2012)
Standard Specification for
Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
This standard is issued under the fixed designation A512; 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 Department of Defense.
1. Scope* 2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
1.1 This specification covers cold-drawn buttweld carbon
steel tubes for use as mechanical tubing.
3. Ordering Information
1.2 This specification covers round, square, rectangular, and
3.1 Orders for material under this specification should
special shape mechanical tubing.
include the following, as required, to describe the required
1.3 Roundtubesizerangescoveredareoutsidediametersup
material adequately:
to 3 ⁄2 in. (88.9 mm) and wall thickness from 0.035 to 0.500
3.1.1 Quantity(feet,weight(Note1),ornumberoflengths),
in. (0.89 to 12.70 mm).
NOTE 1—The term “weight” is temporarily used in this specification
1.4 Optional supplementary requirements are provided and,
because of established trade usage.The word is used to mean both “force”
when desired, shall be so stated in the order.
and “mass,” and care must be taken to determine which is meant in each
case (SI unit for force = newton and for mass = kilogram).
1.5 The values stated in inch-pound units are to be regarded
3.1.2 Name of material (buttweld carbon steel mechanical
as standard. The values given in parentheses are mathematical
tubing),
conversions to SI units that are provided for information only
3.1.3 Form (round, square, rectangular, special shape),
and are not considered standard.
3.1.4 Condition, description and code letters (Section 5),
2. Referenced Documents
3.1.5 Grade, if required (Section 6),
3.1.6 Dimensions (round, Section 9 or square and
2.1 ASTM Standards:
rectangular, Section 10),
A370 Test Methods and Definitions for Mechanical Testing
3.1.7 Length (round length, 9.2; square and rectangular
of Steel Products
length, 10.5),
A1040 Guide for Specifying Harmonized Standard Grade
3.1.8 Burr removal (Section 11),
Compositions for Wrought Carbon, Low-Alloy, andAlloy
3.1.9 Report of chemical analysis and products analysis, if
Steels
required,
E59 Practice for Sampling Steel and Iron for Determination
3.1.10 Individual supplementary requirements if required
of Chemical Composition (Withdrawn 1996)
(S1 through S5),
2.2 Military Standards:
3.1.11 Special requirements,
MIL-STD-129 Marking for Shipment and Storage
3.1.12 End use,
MIL-STD-163 Steel Mill Products Preparation for Shipment
3.1.13 Specification designation,
and Storage
3.1.14 Special marking (Section 15), and
3.1.15 Special packaging (Section 16).
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4. Materials and Manufacture
A01.09 on Carbon Steel Tubular Products.
Current edition approved March 1, 2012. Published November 2012. Originally
4.1 The steel shall be made by any process.
approved in 1964. Last previous edition approved in 2006 as A512 – 06. DOI:
4.2 If a specific type of melting is required by the purchaser,
10.1520/A0512-06R12.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
it shall be as stated on the purchase order.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.3 The primary melting may incorporate separate degas-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
sing or refining, and may be followed by secondary melting,
The last approved version of this historical standard is referenced on
such as electroslag or vacuum-arc remelting. If secondary
www.astm.org.
melting is employed, the heat shall be defined as all of the
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. ingots remelted from a single primary heat.
*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
A512−06 (2012)
A
TABLE 2 Chemical Requirements for Other Carbon Grades
4.4 Steel may be cast in ingots or may be strand cast. When
Grade Chemical Composition Limits, %
steel of different grades is sequentially strand cast, identifica-
Desig-
Phospho-
tion of the resultant transition material is required. The
B
Carbon Manganese Sulfur, max
nation
rus, max
producer shall remove the transition material by an established
1008 0.10 max 0.30–0.50 0.040 0.045
procedure that positively separates the grades.
1010 0.08–0.13 0.30–0.60 0.040 0.045
1012 0.10–0.15 0.30–0.60 0.040 0.045
4.5 Tubes shall be made by the furnace buttweld process.
1015 0.13–0.18 0.30–0.60 0.040 0.045
1016 0.13–0.18 0.60–0.90 0.040 0.045
4.6 Tubes shall be cold finished, either externally only
1018 0.15–0.20 0.60–0.90 0.040 0.045
(sunk) or externally and internally (mandrel drawn).
1019 0.15–0.20 0.70–1.00 0.040 0.045
1020 0.18–0.23 0.30–0.60 0.040 0.045
5. Condition
1021 0.18–0.23 0.60–0.90 0.040 0.045
1025 0.22–0.28 0.30–0.60 0.040 0.045
5.1 The purchaser shall specify in the order one of the
1026 0.22–0.28 0.60–0.90 0.040 0.045
following conditions: 1030 0.28–0.34 0.60–0.90 0.040 0.045
1035 0.32–0.38 0.60–0.90 0.040 0.045
MD (Mandrel Drawn)—No final thermal treatment
C
1110 0.08–0.13 0.30–0.60 0.040 0.130
SD (Sink Drawn)—No final thermal treatment C
1115 0.13–0.20 0.60–0.90 0.040 0.130
C
MDSR—Mandrel Drawn and Stress Relieved 1117 0.14–0.20 1.00–1.30 0.040 0.130
A
SDSR—Sink Drawn and Stress Relieved
Rimmed or capped steels which may be used for the above grades are
characterized by a lack of uniformity in their chemical composition, and for this
MDSA—Mandrel Drawn and SoftAnnealed or normalized
reason product analysis is not technologically appropriate unless misapplication is
SDSA—Sink Drawn and Soft Annealed or normalized
clearly indicated.
B
NORM-MD-SR—Normalized, Mandrel Drawn, and Stress
Other analyses are available.
C
Grades 1110, 1115, and 1117 shall contain 0.08 min % sulfur.
Relieved
NORM-SD-SR—Normalized, Sink Drawn, and Stress Re-
lieved
TABLE 3 Tolerances for Product Analysis for Steels Shown in
Table 1
6. Chemical Composition
Limit, or Maximum Variation, Over Maximum Limit or
Element
6.1 The steel shall conform to the requirements as to
of Specified Under Minimum Limit
Range, %
chemical composition prescribed in Table 1 or Table 2 (see
Under min, % Over max, %
Specification A1040) and Table 3.
Carbon To 0.15, incl 0.02 0.03
Over 01.5 0.03 0.04
6.2 When a grade is ordered under this specification, sup-
Manganeses To 0.60, incl 0.03 0.03
plying an alloy grade that specifically requires the addition of Over 0.60 0.04 0.04
Phosphorus . . 0.01
any element other than those listed for the ordered grade in
Sulfur . . 0.01
Table 1 or Table 2 is not permitted.
7. Heat Analysis
requested in the order or contract, a report of such analyses
7.1 An analysis of each heat of steel shall be made by the
shall be furnished to the purchaser.
steel manufacturer to determine the percentages of the ele-
ments specified; if secondary melting processes are used, the
7.2 A report of this analysis shall be furnished only when
heat analysis shall be obtained from one remelted ingot or the
requested on the order.
product of one remelted ingot of each primary melt. The heat
analysis shall conform to the requirements specified, except 8. Product Analysis
that where the heat identity has not been maintained or where
8.1 When requested on the purchase order, a product analy-
the analysis is not sufficiently complete to permit conformance
sis shall be made by the manufacturer. The chemical compo-
to be determined, the chemical composition determined from a
sition thus determined shall conform to the requirements
product analysis made by the tubular manufacturer shall
prescribed in Table 1 or Table 2 as modified by Table 3.
conform to the requirements specified for heat analysis. When
8.2 The product analysis limits shown for carbon are not
normally applicable to the MT grades.
A
TABLE 1 Chemical Requirements
8.3 The number and source of samples for such product
Chemical Composition Limits, %
Grade analysis shall be based on the individual heat or lot identity of
Phospho-
Designation
Carbon Manganese Sulfur, max
one of the following forms of material.
rus, max
8.3.1 Heat Identity Maintained—One product analysis per
MT 1010 0.05–0.15 0.30–0.60 0.04 0.045
heat on either a billet, a length of flat rolled stock, or a tube.
MT 1015 0.10–0.20 0.30–0.60 0.04 0.045
MT X 1015 0.10–0.20 0.60–0.90 0.04 0.045
8.3.2 Heat Identity Not Maintained—One product analysis
MT 1020 0.15–0.25 0.30–0.60 0.04 0.045
from one tube per 2000 ft (610 m) or less for sizes over 3 in.
MT X 1020 0.15–0.25 0.70–1.00 0.04 0.045
(76.2 mm), or one product analysis from one tube per 5000 ft
A
Rimmed or capped steels which may be used for the above grades are
(1524 m) or less for sizes under 3 in. (76.2 mm).
characterized by a lack of uniformity in their chemical composition, and for this
reason product analysis is not technologically appropriate unless misapplication is
8.4 If the original test for product analysis fails, retests of 2
clearly indicated.
additional billets, 2 lengths of flat rolled stock, or 2 tubes shall
A512−06 (2012)
TABLE 5 Permissible Variations in Length—Round Tubing
be made. Both retests for the elements in question shall meet
the requirements of this specification; otherwise all remaining Lengths 4 ft (1.2 m) and under—up to 2 in. (50.8 ± ⁄32 in. (0.8 mm)
mm) diameter
material in the heat or lot shall be rejected, or at the option of
Lengths 4 ft (1.2 m) and under—over 2 in. (50.8 ± ⁄64 in. (1.2 mm)
the producer, each billet, length, flat rolled stock, or tube may
mm) diameter
be individually tested for acceptance. Lengths 4 ft to 10 ft (1.2 to 3.0 m), incl—up to 2 ± ⁄64 in. (1.2 mm)
in. (50.8 mm) diameter
8.5 Samples for product analysis, except for spectrochemi-
Lengths 4 ft to 10 ft (1.2 to 3.0 m), incl—over 2 ± ⁄16 in. (1.6 mm)
in. (50.8 mm) diameter
cal analysis, shall be taken in accordance with Practice E59,
Lengths 10 ft to 24 ft (3.0 to 7.3 m), incl—all ± ⁄8 in. (3.2 mm)
and the composition thus determined shall correspond to the
diameters
A
requirements in applicable section or table.
Lengths over 24 ft (7.3 m)—all diameters ± ⁄8 in. (3.2 mm)
A
Plus an additional tolerance of ± ⁄16 (1.6 mm) for each 10 ft (3.0 m) or fraction
9. Permissible Variations in Dimensions of Round Tubing
over 24 ft (7.3 m).
9.1 Diameter and Wall Thickness :
9.1.1 Variations in outside diameter, inside diameter, and
9.3.1 Aroundtubeshallbeconsideredstraightprovidedthat
wallthicknessshallnotexceedtheamountsprescribedinTable
no 3-ft (0.9-m) section departs from a straight line by more
4.
than 0.030 in. (0.76 mm).
9.1.2 These variations apply to round, unannealed, and
9.3.2 The straightness of round tubes shorter than 3 ft (0.9
stress-relieved tubing.
m) shall be proportionate to 0.010 in./ft (0.8 mm/m).
9.1.3 Diameter tolerance includes ovality.
9.3.3 These straightness tolerances do not apply to soft-
9.1.4 Sink tubing is normally ordered by outside diameter
annealed tubing nor to long lengths of small diameter tubing.
and nominal wall. Mandrel-drawn tubing is normally ordered
byoutsidediameterandinsidediameterandmaybeorderedby
10. Permissible Variations in Dimensions of Square and
outside diameter or inside diameter and wall thickness but not
Rectangular Tubing
by all three dimensions.
10.1 OutsideDimensionsandWallThickness—Variations in
9.2 Length—Randomlengthsbetweenacceptablelimitswill
largest outside dimensions across flats and wall thickness shall
befurnished,utilizingthefullmilllength.Tubingwillbecutin
not exceed the amounts prescribed in Table 6.
half if specified. Full length random tubing will have a spread
10.2 Corner Radii—The corners of square and rectangular
not exceeding 7 ft (2.1 m). Half-length random tubing will
tubes shall be slightly rounded inside and slightly rounded
have a spread not exceeding 4 ft (1.2 m). Not more than 10 %
outside consistent with wall thickness. The outside corners
of the total footage of a shipment may be furnished in lengths
may be slightly flattened. The radii of corners for square and
shorter than the minimum specified but not less than 6 ft (1.8
rectangular cold-finished buttweld tubes shall be in accordance
m).
with Table 7. Special radii may be obtained.
9.2.1 Whenspecified,multiplelengthswillbefurnishedand
shouldincludeallowancesmadeforthecustomer’scuttingtool 10.3 Squareness Tolerance—Permissible variations for the
width and grippage. Maximum and minimum lengths may be side of square and rectangular tube shall be determined by the
specifiedwiththeunderstandingthatnotmorethan10 %ofthe
following equation:
total footage in a shipment may be furnished in individual
6b 5c 30.006, in. ~mm!
multiples cut to the customer’s specifications.
where:
9.2.2 Variations from the specified length shall not exceed
the amounts prescribed in Table 5. b = tolerance for out-of-square, and
c = largest external dimensions across flats, in. (mm).
9.3 Straightness:
TABLE 4 Diameter and Wall Thickness Tolerances for Round Tubing
Outside Diameter, in. (mm) Inside Diameter, in. (mm) Wall Thickness, %
Outside Diameter Range, in. (mm)
Over Under Over Under Over Under
Sunk
A
Up to ⁄2 (12.7), excl 0.004 (0.10) 0 . . . . . . 15 15
1 1 A
⁄2 to 1 ⁄2 (12.7 to 38.1), excl 0.005 (0.13) 0 . . . . . . 10 10
A
1 ⁄2 to 3 (38.1 to 76.2), incl 0.010 (0.25) 0 . . . . . . 10 10
Mandrel Drawn
Less than 0.156 (3.96) wall:
1 1 1
Up to ⁄2 (12.7), excl 0.004 (0.10) 0 0 0.010 (0.25) 12 ⁄2 12 ⁄2
B
1 1
⁄2 to 1 ⁄2 (12.7 to 38.1), excl 0.005 (0.13) 0 0 0.005 (0.13) 10 10
0.156 (3.96) wall and over:
B
1 1
⁄2 to 1 ⁄2 (12.7 to 38.1), excl 0.005 (0.13) 0 0 0.005 (0.13) 77
Under 0.156 (3.96) wall:
1 ⁄2 (38.1) and over 0.010 (0.25) 0 . . . 0.010 (0.25) 10 10
0.156 (3.96) wall and over:
1 ⁄2 (38.1) and over 0.010 (0.25) 0 0 0.010 (0.25) 7 7
A
Except at the weld line, where the weld pad may exceed this figure.
B
Tubes with an inside diameter under ⁄2 in. (12.7 mm) may require more than 0.005 in. (0.13 mm) inside diameter tolerance and the producer should be consulted.
A512−06 (2012)
TABLE 6 Outside Dimension and Wall Th
...
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