ASTM A731 - A 731M - 91 scan

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ASTM A73L/A731M 91 m 0759510 oo7qgso 4 m

Designation: A 731/A 731M - 91

Standard Specification For

Seamless, Welded Ferritic, and Martensitic Stainless Steel

Pipe’

This standard is issued under the fixed designation A 73 l/A 73 IM, 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 (e) indicates an editorial change since the last revision or reapproval.

Scope

1.1 This specification2 covers seamless, welded ferritic,

and martensitic stainless steel pipe intended for high-temper-

ature and general corrosive service.

1.2 Most of the grades are commonly known as the

straight chromium type and are characterized as being

ferromagnetic.

1.3 High-chromium, ferritic alloys are highly sensitive to

notch brittleness on slow cooling to ordinary temperatures.

This feature should be recognized in the use of this material

in the as-welded condition in sections thicker than 0.250 in.

[6.3.mm].

1.4 Optional supplementary requirements are provided

for pipe where a greater degree of testing is desired. These

supplementary requirements call for additional tests to be

made and, when desired, one or more of these may be

specified in the order.

1.5 The values stated in either inch-pound units or SI

units are to be regarded separately as standard. Within the

text, the SI units are shown in brackets. The values stated in

each system are not exact equivalents; therefore, each system

must be used independently of the other. Combining values

from the two systems may result in nonconformance with

the specification. The inch-pound units shall apply unless the

“M” designation of this specification is specified in the order.

NOTE

l-The dimensionless designator NPS (nominal pipe size) has

been substituted in this standard for such traditional terms as “nornina

diameter, ” “size,” and “nominal size.”

2. Referenced Documents

2.1 ASTM Standards:

A 530/A 530M Specification for General Requirements

for Specialized Carbon and Alloy Steel Pipe3

A763 Practices for Detecting Susceptibility to Inter-

granular Attack in Ferritic Stainless Steels4

E 340 Method for Macroetching Metals and Alloys5

E 527 Practice for Numbering Metals and Alloys3

2.2 ANSI Standards?

f This specification is under the jurisdiction of ASTM Committee A-l on Steel,

Stainless Steel, and Related Alloys, and is the direct responsibility of Subcom-

mittee A01.10 on Tubing,

Current edition aooroved July 15. 1991. Published September 199l.OriginaIIy

published as A 731 L 79. Last pmvious edition A 731- g8.

s For ASME Boiler and Pressure Vessel Code applications see related Specift-

cation SA-731 in Section II of that Code.

3 Annual Book of ASTM Standards,

Vol 0 1 .O 1.

Annual Book of ASTM

Standards,

Vol 0 1.03.

Annual Book ofASTM Standards,

VolO3.0 1.

6 Available from American National Standards Institute, 11 West 42nd St.,

13th Floor, New York, NY 10036.

B 1.20.1 Pipe Threads, General Purpose

B36.10 Welded and Seamless Wrought Steel Pipe

B36.19 Stainless Steel Pipe

3. General Requirements

3.1 Material furnished under this specification shall con-

form to the applicable requirements of the current edition of

Specification A 530/A 530M, unless otherwise provided

herein,

4. Ordering Information

4.1 Orders for material under this specification should

include the following, as required, to describe the desired

material adequately:

4.1-l Quantity (feet, metres, or number of lengths),

4.1.2 Name of material (fenitic stainless steel pipe),

4.1.3 Process (seamless or welded),

4.1.4 Grade (see Table I),

4.1.5 Size (NPS or outside diameter and schedule number

or average wall thickness),

4.1.6 Length (specific or random, Section 1 l), and

4.1.7 End finish (see Section on Ends of Specification

A 530/A 530M),

4.1.8 Optional requirements (Section 10, and Supplemen-

tary Requirements Sl to S6),

4.1.9 Test report required (see Section on Certification of

Specification A 530/A 530M),

4.1.10 Specification designation, and

4.1.11 Special requirements.

5. Materials and Manufacture

5.1 Manyfacture:

5.1.1 The pipe shall be made by the seamless or by an

automatic welding process, with no addition of filler metal in

the welding operation.

5.1.2 The pipe shall be pickled free from scale.

5.2 Heat Treatment-As a final heat treatment, pipe shall

be heated to a temperature of 1400°F [76o”C] or higher and

cooled (as appropriate for the grade) to meet the require-

ments of this specification.

5.2.1 The martensitic grade UNS S41500 shall be heated

to a temperature of 950°F (510°C) or higher and cooled as

appropriate to meet the requirements of this specification.

6. Chemical Composition

6.1 The steel shaIl conform to the requirements as to

chemical composition prescribed in Table 1.

7. Product Analysis

7.1 At the request of the purchaser, an analysis of either

ASTN

A731/A731M

0759530

0079453

1 Grade

Element

Carbon, max, %

Manganese, max, %

Phosphorus, max, %

Sulfur, max, %

Silicon, max, %

Nickel,P max, 56

Chromium, %

Molybdenum, 36

Alumlnum, max, 4;

Copper, max, %

Nitrogen, max, 96

Tftanlum, %

Columbium, %

18Cr-2Mo

0.025

ii40

0:030

1 ,oo

1 .oo

17.5-l 9.5

1.75-2.50

. . .

.I.

0.035

TI + Cb =

0.20 + 4 x

(C + N)

min; 0.80 max

#j) A 731/A 731M

TABLE 1 Chemical Requirements

TP XM-33

S44626

0.06

0.75

0.04

0.02

0.75

0.50

25.0-27.0

0.75-i .50

. . .

0.20

0.040

7 x (C + N)

but no less

than 0.20

min; 1 .OO

max

TP XM-27

S44627

0.01 o

0.40

0.02

0.40

0.50

25.0-27.5

0.75-i .50

* . *

0.20

0.015

. . .

0.05-0.20

TP 439

0.20 + 4 x

(C + N)

min; 1 .I.0 max

0.05

0.05-l .o

0.03

0.06

3.5-5.5

11.5-14.0

0.5-l .o

. . .

0.010

0.30

0.025

0.020

0.20

0.15 max

28.0-30.0

3.5-4.2

, . .

0.15

0.020E

* . .

0.010

0.30

0.025

0.020

0.20

2.0-2.5

28.0-30.0

3.5-4.2

.a.

0.030

1.00

0.040

0.030

1 .oo

1 *o-3.50

25.0-28.0

3.0-3.50

* . .

. . .

0.040

(Tl + Cb) =

0.20-100 and 6 x

(C + NJ

min

A New designation established in accordance with ASTM E 527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS).

a Plate version of CAGNM.

c For small-diameter piping, where many reduction passes may be required, a carbon maximum of 0.015 % is necessary. Small-diameter pipes are defined as those less

than I .315 in. [33.4 mm] in outside diameter.

P Nickel plus copper.

E Carbon plus nitrogen = 0.025 % max.

one billet, one length of flat-rolled stock, or one tube shall be

made from each heat. The chemical composition thus

determined shall conform to the requirements specified.

7.2 The results of these analyses shall be reported to the

purchaser or the purchaser’s representative, and shall con-

form to the requirements specified in Section 6.

7.3 If the original test for product analysis fails, retests of

two additional billets, lengths of flat-rolled stock, or tubes

shall be made. Both retests for the elements in question shall

meet the requirements of this specification; otherwise all

remaining material in the heat or lot shall be rejected or, at

the option of the producer, each billet or tube may be

individually tested for acceptance. Billets, lengths of flat-

rolled stock, or tubes that do not meet the requirements of

this specification shall be rejected.

7.3.1 The lot size for the same NPS of each heat of steel

shall be as follows:

NPS Designator Lengths of Pipe in Lot

Under 2

400 or fraction thereof

2 to 5 200

or fraction thereof

6 and over 100 or fraction thereof

8. Tensile Requirements

8.1 The material shall conform to the tensile requirements

prescribed in Table 2.

9. Mechanical Requirements

9.1 Transverse or Longitudinal Tension Test-The ten-

sion test shall be performed on 1 % of the pipe from each lot.

NO-K 2-The term “lot” for mechanical tests

applies to

all

pipe

the same

nominal

size and wall thickness (or schedule) that is produced

from the same heat of steel and subjected to the same finishing

treatment: (I) in a continuous heat treatment furnace, or (2) in a

batch-type, heat-treatment furnace, in which case the lot shall include

only that pipe heat treated in the same batch furnace charge.

9.2 Flattening Test-For material heat treated in a batch-

type furnace, flattening tests shall be made on 5 % of the pipe

from each heat-treated lot. For material heat treated by the

continuous process, this test shall be made on a sufficient

number of pipe to constitute 5 % of the lot, but in no case

less than two lengths of pipe.

9.3 Hydrostatic Test-Each length of finished pipe shall

be subjected to the hydrostatic test.

10. Lengths

10.1 Pipe lengths shall be in accordance with the fol-

lowing regular practice:

10.1.1 Unless otherwise agreed upon, all sizes are gener-

ally available in a length up to 24 ft (Note 3) with the

permissible range of 15 to 24 ft (Note 3). Short lengths are

acceptable; however, the number and minimum length shall

be agreed upon between the manufacturer and the purchaser.

NOTE

3-This value(s) applies when the inch-pound designation of

this specification is the basis of purchase. When the “M” designation of

this specification is the basis of purchase, the corresponding metric

value(s) shall be agreed upon between the manufacturer and purchaser.

TABLE 2 Tensile Requirements

Grade

18Cr-2Mo TPXM-33,

TPXM-27 TP439 26-3-3

Tensile strength, min, psi [MPa] 60 000 [415] 65 000 [450] 60 000 [415] 115 [795] 80 000 [550] 85 [585]

Yield strength min, psi [MPa] 40 000 [275] 40 000 [275] 30 000 [205] 90 [620] 60 000 [415] 65 [450]

Elongation In 2 In. or 59mm (or 20 20 20 15 20 20

40) min, 96

ASTM A73l,/A731M =lL - 0759530 0079452 I, m

0 A 731/A 731M

10.1.2 If definite cut lengths are desired, the lengths

required shall be specified in the order. No pipe shall be

under the specified length and not more than */4 in. [6 mm]

over that specified.

10.1.3 No jointers are permitted unless otherwise speci-

tied.

11. Finish

11.1 The finished pipes shall be straight to within s/16 in.

[5 mm] maximum bow in any 6 ft [2 m] as measured with a

6-ft [2-m] straight edge. Imperfections may be removed by

grinding provided the outside diameter or the wall thickness

are not decreased to less than that permitted, in accordance

with the Section on Permissible Variations in Wall Thickness

or the Table on Permissible Variations in Outside Diameter

of Specification A 530/A 530M.

12. Product Marking

12.1 In addition to the marking specified in Specification

A 530/A 530M, the marking shall include the manu-

facturer’s private identifying mark and whether the material

is seamless or welded.

12.2 The marking shall also include the heat number and

heat-treatment lot identification. If specified in the purchase

order, the marking for pipe larger than NPS 4 shall include

the mass.

SUPPLEMENTARY REQUIREMENTS FOR PIPE REQUIRING SPECIAL

CONSIDERATION

The supplementary requirements in Sections S 1 to S6 shall not be considered unless specified in the order.

Those specified in the order shall be made at the mill, unless otherwise agreed upon, and may be witnessed

by the purchaser’s inspector before shipment of the material.

Sl. Product Analysis

Sl. 1 For all pipe NPS 5 and larger there shall be one

product analysis made of a representative sample from one

piece for each ten lengths or fraction thereof from each heat

of steel.

S1.2 For pipe smaller than NPS 5 there shall be one

product analysis made from ten lengths per heat of steel or

from 10 % of the number of lengths per heat of steel,

whichever number is smaller.

S 1.3 Individual lengths failing to conform to the chemical

requirements specified in Section 6 shall be rejected.

S2. Transverse Tension Tests

S2.1 There shall be one transverse tension test made from

one end of 10 % of the lengths furnished per heat of steel,

This applies only to NPS 8 and larger.

S2.2 If a specimen from any length fails to conform to the

tensile properties specified, that length shall be rejected.

S3. Flattening Test

S3.1 The flattening test shall be made on specimens from

one end of each length of pipe. Crop ends may be used. If the

specimen from any length fails to conform to the specified

requirement, that length shall be rejected.

S4. Etching Tests

S4.1 An etching test shall be made on a transverse section

from one end of each length and shall show sound, homoge-

neous, and reasonably uniform material, free from injurious

laminations, cracks, and similar objectionable defects. An

etching test in accordance with Method E 340 shall be made.

If the specimen of any length shows objectionable defects,

one retest shall be permitted from the same end. If this fails,

the length shall be rejected. The rings for the flattening tests

(Supplementary Requirement S3) may be used for etch tests

either before or after flattening.

S5. Nondestructive Electric Test

S5.1 Each seamless or welded pipe shall be subjected to a

nondestructive electric test as agreed upon between the

manufacturer and purchaser.

S6. Intergranular Corrosion Test

S6.1 When specified in the purchase order, intergranular

corrosion tests shall be run on ferritic stainless steel speci-

mens as described in Practices A 763. The particular corro-

sion test to be used shall be as specified in Practices A 763.

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本页面提供ASTM A731 - A 731M - 91标准的扫描版本，该标准主要规范了用于高温或腐蚀性环境的无缝及焊接铁素体不锈钢管的技术要求。内容涵盖材料化学成分、力学性能、制造工艺、热处理条件、尺寸公差及试验方法等关键参数。该版本为1991年发布的历史版本，适用于需要追溯或参考早期技术要求的工程分析、合规验证或文献研究。用户可通过本扫描文档快速查阅原始规格细节，确保设计、采购或质检过程中对标准的准确引用。

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