ASTM A803/A803M-16(2021)
(Specification)Standard Specification for Seamless and Welded Ferritic Stainless Steel Feedwater Heater Tubes
Standard Specification for Seamless and Welded Ferritic Stainless Steel Feedwater Heater Tubes
ABSTRACT
This specification covers standard requirements for welded ferritic stainless steel feedforward heater tubes including those bent, if specified, into the form of U-tubes for application in tubular feed-water heaters. All finished straight tubing or straight tubing ready for U-bending shall be furnished in the solution-annealed condition. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium. The material shall also conform to tensile properties such as tensile strength, yield strength, and elongation. The steel shall meet the specified values for Brinell and Rockwell hardness. The steel shall undergo mechanical tests such as tension test, hardness test, reverse flattening test, flange test, pressure test, hydrostatic test, and air underwater test. Corrosion resisting properties of the sample tube shall also be determined.
SCOPE
1.1 This specification covers seamless and welded ferritic stainless steel feedwater heater tubes including those bent, if specified, into the form of U-tubes for application in tubular feedwater heaters.
1.2 The tubing sizes covered shall be 5/8 to 1 in. [15.9 to 25.4 mm] inclusive outside diameter, and average or minimum wall thicknesses of 0.028 in. [0.7 mm] and heavier.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A803/A803M −16 (Reapproved 2021)
Standard Specification for
Seamless and Welded Ferritic Stainless Steel Feedwater
Heater Tubes
This standard is issued under the fixed designationA803/A803M; 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.
1. Scope A1016/A1016MSpecification for General Requirements for
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
1.1 This specification covers seamless and welded ferritic
Steel Tubes
stainless steel feedwater heater tubes including those bent, if
specified, into the form of U-tubes for application in tubular
3. Terminology
feedwater heaters.
3.1 Definitions—For definitions of terms used in this
1.2 Thetubingsizescoveredshallbe ⁄8to1in.[15.9to25.4
specification, refer to Terminology A941.
mm] inclusive outside diameter, and average or minimum wall
thicknesses of 0.028 in. [0.7 mm] and heavier.
4. Ordering Information
1.3 The values stated in either SI units or inch-pound units
4.1 It is the responsibility of the purchaser to specify all
are to be regarded separately as standard. Within the text, the
requirements that are necessary for material under this speci-
SI units are shown in brackets. The values stated in each
fication.Suchrequirementsmayinclude,butarenotlimitedto,
system may not be exact equivalents; therefore, each system
the following:
shall be used independently of the other. Combining values
4.1.1 Quantity (length or number of pieces),
from the two systems may result in non-conformance with the
4.1.2 Material description (seamless or welded),
standard.
4.1.3 Dimensions (outside diameter, wall thickness (mini-
1.4 This international standard was developed in accor-
mum or average wall), and length),
dance with internationally recognized principles on standard-
4.1.4 Grade (chemical composition) (Table 1), and
ization established in the Decision on Principles for the
4.1.5 U-bend requirements, if order specifies bending,
Development of International Standards, Guides and Recom-
U-bend schedules or drawings shall accompany the order.
mendations issued by the World Trade Organization Technical
4.2 Optional Requirements—Purchaser shall specify
Barriers to Trade (TBT) Committee.
whether annealing of the U-bends is required or whether tubes
are to be hydrotested or air-tested (see 10.6).
2. Referenced Documents
4.3 Supplementary Requirements—Purchaser shall specify
2.1 ASTM Standards:
onthispurchaseorderifmaterialistobeeddy-currenttestedin
A480/A480MSpecification for General Requirements for
accordance with Supplementary Requirement S1 or S2, and if
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
specialtestreportsarerequired,underSupplementaryRequire-
Sheet, and Strip
ment S3, and,
A763Practices for Detecting Susceptibility to Intergranular
Attack in Ferritic Stainless Steels
4.4 Any additional special requirements.
A941TerminologyRelatingtoSteel,StainlessSteel,Related
Alloys, and Ferroalloys
5. General Requirements
5.1 Material furnished to this specification shall conform to
the applicable requirements of the latest published edition of
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Specification A1016/A1016M unless otherwise provided
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
herein.
A01.10 on Stainless and Alloy Steel Tubular Products.
Current edition approved March 1, 2021. Published April 2021. Originally
approved in 1982. Last previous edition approved in 2016 as A803/A803M–16.
6. Materials and Manufacture
DOI: 10.1520/A0803_A0803M-16R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6.1 Thetubingshallbemanufacturedbyeithertheseamless
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
or welded process.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.2 Seamless Tubing:
*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
A803/A803M−16 (2021)
TABLE 1 Chemical Requirements
Grade UNS UNS S 43035 UNS UNS S 44626 UNS S 44635 UNS S 44660 UNS UNS UNS S 44400 UNS S 44735
S 40900 TP439 S 44627 TP XM-33 25-4-4 26-3-3 S 44700 S 44800 18-2 29-4C
TP409 TP XM-27 29-4 29-4-2
Element Composition, %
A
C, max 0.08 0.07 0.01 0.06 0.025 0.030 0.010 0.010 0.025 0.030
Mn, max 1.00 1.00 0.40 0.75 1.00 1.00 0.30 0.30 1.00 1.00
P, max 0.045 0.040 0.02 0.040 0.040 0.040 0.025 0.025 0.040 0.040
S, max 0.030 0.030 0.02 0.020 0.030 0.030 0.020 0.020 0.030 0.030
Si, max 1.00 1.00 0.40 0.75 0.75 1.00 0.20 0.20 1.00 1.00
B
Ni 0.50 max 0.50 max 0.5 max 0.50 max 3.5–4.5 1.0–3.5 0.15 max 2.0–2.5 1.00 max 1.00 max
Cr 10.5– 17.0–19.0 25.0–27.5 25.0–27.0 24.5–26.0 25.0–28.0 28.0–30.0 28.0–30.0 17.5–19.5 28.0–30.0
11.7
Mo . . . . . . 0.75–1.50 0.75–1.50 3.5–4.5 3.0–4.0 3.5–4.2 3.5–4.2 1.75–2.50 3.6–4.2
Al . 0.15 max . . . . . . . .
Cu . . . . . . 0.20 max 0.20 max . . . . . . 0.15 max 0.15 max . . . . . .
N . . . 0.04 max 0.015 0.040 max 0.035 0.040 max 0.020 0.020 0.035 max 0.045 max
max
C C
max max
D D D D
Ti 6×C 0.20+4(C+ . 7×(C+N)but (Ti + Nb )= Ti + Nb =6× (Ti + Nb )= Ti + Nb =6×
0.2+4(C+N) (C + N) but no 0.20+4(C+ (C + N) but no
min; 0.75 N) min; 1.10 no less than
min; 0.80 less than 0.20 N) min; 0.80 less than 0.20
max max 0.20 min;
min; min; 1.00 max
1.00 max max 1.00 max max
D
Nb . . . . . . 0.05–0.20 . . . . . . . . . . . . . . . . . . . . .
A
For small diameter or thin walls, or both, tubing, where many drawing passes are required, a carbon maximum of 0.015 % is necessary. Small outside diameter tubes
are defined as those less than 0.500 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.2 mm] in average wall thickness (0.040 in. [1
mm] in minimum wall thickness).
B
Nickel + copper.
C
Carbon + nitrogen = 0.025 max.
D
The term Niobium (Nb) and Columbium (Cb) are alternate names for the same element.
6.2.1 Seamless tubing shall be supplied from a cold finish material to a temperature of 1200°F [650°C] or higher and
process.Hotfinishingasthefinalsizingprocessisnotallowed. cooling (as appropriate for the grade) to meet the requirements
of this specification.
6.3 Welded Tubing:
6.3.1 The tube shall be made from flat-rolled steel by an 8.2 If heat treatment of U-bends is specified, it shall satisfy
automatic welding process with no addition of filler metal. the annealing procedure described in 8.1 and shall be done as
follows:
6.4 Surface contaminants may have detrimental effects on
8.2.1 The heat treatment shall be applied to the U-bend area
high temperature properties or corrosion resistance of tubing.
plus approximately 6 in. [150 mm] of each leg beyond the
Contamination by copper, lead, mercury, zinc, chlorides, or
tangent point of the U-bend.
sulfur may be detrimental to stainless steels.The manufacturer
8.2.2 If the heat treatment specified in 8.2 is accomplished
shall employ techniques which minimize surface contamina-
by resistance-heating methods wherein electrodes are clamped
tion by these elements.
to the tubes, the clamped areas shall be visually examined for
7. Cleaning Before Annealing arc burns. Burn indications shall be cause for rejection unless
they can be removed by local polishing without encroaching
7.1 All lubricants or coatings used in the manufacture of
upon minimum wall thickness.
straight-lengthtubeorinthebendingshallberemovedfromall
8.2.3 Temperature control shall be accomplished through
surfaces prior to any annealing treatments. U-bends on which
the use of optical or emission pyrometers, or both. No
a lubricant had been applied to the inside surface during
temperature-indicating crayons, lacquers, or pellets shall be
bending shall have the cleanness of their inside surface
used.
confirmed by blowing close-fitting acetone-soaked felt plugs
8.2.4 Theinsideofthetubeshallbepurgedwithaprotective
through10%ofthetubesofeachbendradius.Dry,oil-freeair
oraninertgasatmosphereduringheatingandcoolingtobelow
or inert gas shall be used to blow the plugs through the tubes.
700°F [370°C] to prevent scaling of the inside surface. The
If the plugs blown through any tube show more than a light
atmosphere should be noncarburizing.
graydiscoloration,alltubesthathavehadalubricantappliedto
the inside surface during bending shall be recleaned. After
9. Chemical Composition
recleaning 10% of the tubes of each bend radius whose inside
surface had been subjected to bending, lubricants shall be
9.1 Product Analysis:
retested.
9.1.1 The steel shall conform to the chemical composition
in Table 1.
8. Heat Treatment
9.1.2 When specified on the purchase order, a product
8.1 All finished straight tubing or straight tubing ready for analysis shall be supplied from one tube or coil of steel per
U-bending shall be furnished in the solution-annealed condi- heat. The product analysis tolerance of Specification A480/
tion. The annealing procedure shall consist of heating the A480M shall apply.
A803/A803M−16 (2021)
A
TABLE 3 Minimum Elongation Values
9.1.3 If the original test for product analysis fails, retests of
Elongation in 2 in. or 50 mm,
two additional lengths of flat-rolled stock or tubes shall be B
Wall Thickness
min, %
made. Both retests, for the elements in question, shall meet the
in. mm 29-4C All Other
requirements of this specification; otherwise all remaining
material in the heat or lot shall be rejected or, at the option of
⁄16 (0.312) 8 18 20
the producer, each length of flat-rolled stock or tube may be
⁄32 (0.281) 7.2 17 19
⁄4 (0.250) 6.4 16 18
individually tested for acceptance. Lengths of flat-rolled stock
⁄32 (0.219) 5.6 15 17
or tubes that do not meet the requirements of this specification
⁄16 (0.188) 4.8 14 16
shall be rejected.
⁄32 (0.156) 4 13 15
⁄8 (0.125) 3.2 13 14
⁄32 (0.094) 2.4 12 13
10. Mechanical Requirements
⁄16 (0.062) 1.6 11 12
10.1 Tensile Properties: 0.062 to 0.035, excl 1.6 to 0.9 10 12
0.035 to 0.022, excl 0.9 to 0.6 10 11
10.1.1 The material shall conform to the tensile properties
0.022 to 0.015, excl 0.6 to 0.4 10 11
shown in Table 2.
A
Calculation elongation shall be rounded to the nearest whole number.
10.1.2 Onetensiontestshallbemadeonaspecimenforlots
B
Where the wall thickness lies between two values shown above, the minimum
of not more than 50 tubes. Tension tests shall be made on
elongation value shall be determined by the following equation:
specimens from two tubes for lots of more than 50 tubes.
Grade Equation
10.1.3 Table 3 gives the computed minimum elongation
29-4C E = 28.8t + 9.00
values for each ⁄32 in. [0.8 mm] decrease in wall thickness.
[E = 1.13t + 9.00]
All other E = 32t + 10.00
10.2 Hardness:
[E = 1.25t + 10.00]
10.2.1 Thetubesshallhaveahardnessnumbernottoexceed
where:
thoseprescribedinTable4.Thishardnessrequirementisnotto
E = elongation in 2 in. or 50 mm, %, and
apply to the bend area of U-bend tubes which are not heat
t = actual thickness of specimen, in. [mm].
treated after bending.
10.2.2 Brinell or Rockwell hardness tests shall be made on
specimens from two tubes from each lot.
TABLE 4 Hardness Requirements
10.3 Reverse Flattening Test (for Welded Product)—One
Brinell Hardness, Rockwell Hardness,
reverse flattening test shall be made on a specimen from each
max B Scale,
Grade
1500 ft [460 m] of finished tubing. max
10.4 Flange Test (for Welded Product)—Flange tests shall
TP 409 207 95
be made on specimens from each end of one finished tube, not
TP 439 207 95
the one used for the flattening test, from each lot. P XM-27 241 100
TP XM-33 241 100
A
10.5 Flaring Test (for Seamless Tubes)—One test shall be
25-4-4 270 27
A
26-3-3 265 25
made on specimens from one end of one tube from each lot of
29-4 241 100
finished tubes. The minimum expansion of the inside diameter
29-4-2 241 100
shall be 10%.
18-2 217 95
29-4C 241 100
10.6 Pressure Test—Each straight tube, or each U-tube after
A
Rockwell Hardness, C scale.
completion of the bending and post-bending heat treatment,
shall be pressure-tested in accordance with one of the follow-
ing paragraphs as specified by the purchaser:
10.6.1 Hydrostatic Test—Each tube shall be given an inter-
TABLE 2 Tensile Requirements
nal hydrostatic test in accordance with Specification A1016/
A
Elongation
A1016M.
Tensile Strength, Yield Strength,
in2in.
Grade
or 50 mm, 10.6.2 Pneumatic Test—Each tube shall be examined by a
min, ksi [MPa] min, ksi [MPa]
min, %
pneumatic test (either air underwater or pneumatic leak test) in
TP 409 55 [380] 30 [205] 20
accordance with Specification A1016/A1016M.
TP 439 60 [415] 30 [205] 20
TP XM-27 65 [450] 40 [275] 20
10.7 Lot Definitions:
TP XM-33 68 [470] 45 [310] 20
10.7.1 For flange and flaring test requirements, the term
25-4-4 90 [620] 75 [515] 20
26-3-3 85 [585] 65 [450] 20
“lot” applies to 125 tube groupings, prior to cutting to length,
29-4 80 [550] 60 [415] 20
ofthesamenominalsizeandwallthickness,producedfromthe
29-4-2 80 [550] 60 [415] 20
same heat of steel and annealed in a continuous furnace.
18-2 60 [415] 35 [240] 20
29-4C 75 [515] 60 [415] 18
10.7.2 Fortensionandhardnessrequirements,theterm“lot”
A
For longitudinal strip tests, a deduction of 0.90 % for 29-4C and 1 % for all other applies to all tubes, prior to cutting to length, of the same
grades shall be made from the basic minimum elongation for each ⁄32 in. [0.8 mm]
nominal diameter and wall thickness, produced from the same
decrease in wall thickness below ⁄16 in.[8mm]. Table 3 gives the computed
heat of steel and annealed in a continuous furnace at the same
minimum values.
temperature, time at temperature, and furnace speed.
A803/A803M−16 (2021)
11. Corrosion Resisting Properties greater, neither the major nor minor diameter of the tube shall
deviate from the nominal diameter prior to bending by more
11.1 One full section sample 1 in. [25 mm] long from the
than 10%. If less than 2 × D is specified, tolerances could be
center of a sample tube of the smallest radius bend that is heat
greater.
treated shall be tested in the heat treated condition in accor-
dance with the appropriate practice in Practices A763 for the 12.2 Permissible Variations from the Specified Wall Thick-
specified grade, or as agreed upon for TP409.
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