ASTM A268 / A268M - 20 Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

ASTM A268 / A268M - 20

Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Active Standard ASTM A268 / A268M | Developed by Subcommittee: A01.10

Book of Standards Volume: 01.01

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Abstract

This guide covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service. 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 number of tubes in a lot heat treated by the continuous process shall be determined from the size of the tubes. The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation. The tubes shall have a hardness number that will not exceed the prescribed Brinell and Rockwell hardness values. Several mechanical tests shall be conducted, namely: tension test; flaring test (for seamless tubes); flange test (for welded tubes); hardness test; reverse flattening test; intergranular corrosion test; and hydrostatic or nondestructive electric test.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification2 covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic. Two of these grades, TP410 and UNS S 41500 (Table 1), are amenable to hardening by heat treatment, and the high-chromium, ferritic alloys are sensitive to notch-brittleness on slow cooling to ordinary temperatures. These features should be recognized in the use of these materials.

TABLE 1 Continued

Grade

TP439

. . .

TP430 Ti

TP
XM-27

TP
XM-33^A

18Cr-2Mo

29-4

29-4-2

26-3-3

25-4-4

...

. . .

TP468

UNS
Designation

S43035

S43932

S41500^B

S43036

S44627

S44626

S44400

S44700

S44800

S44660

S44635

S44735

S32803

S40977

S43940

S42035

S46800

Element

Composition, %

C, max

0.07

0.030

0.05

0.10

0.01^A

0.06

0.025

0.010

0.030

0.025

0.030

0.015^C

0.03

0.08

0.030

Mn, max

1.00

0.5–1.0

1.00

0.40

0.75

1.00

0.30

1.00

0.5

1.50

1.00

P, max

0.040

0.03

0.040

0.02

0.040

0.025

0.040

0.020

0.040

0.045

0.040

S, max

0.030

0.03

0.030

0.02

0.020

0.030

0.020

0.030

0.005

0.015

0.030

Si, max

1.00

0.60

1.00

0.40

0.75

1.00

0.20

1.00

0.75

1.00

0.50

1.00

0.50 max

0.50

3.5–5.5

0.75 max

0.5^D max

0.50 max

1.00 max

0.15 max

2.0–2.5

1.0–3.50

3.5–4.5

1.00 max

3.0–4.0

0.30–1.00

. . .

1.0–2.5

0.50

17.00–

17.0–19.0

11.5–14.0

16.00–

25.0–27.5

25.0–27.0

17.5–19.5

28.0–30.0

25.0–28.0

24.5–26.0

28.00–

28.0–
29.0

10.50–
12.50

17.50–
18.50

13.5–
15.5

18.00–
20.00

19.00

19.50

30.00

...

0.5–1.0

...

0.75–1.50

1.75–2.50

3.5–4.2

3.0–4.0

3.5–4.5

3.60–4.20

1.8–2.5

. . .

0.2–1.2

. . .

Al, max

0.15

. . .

...

. . .

Cu, max

...

. . .

...

0.2

0.20

...

0.15

...

. . .

N, max

0.04

0.030 (Ti + Cb) {0.20 + 4 (C + N)} min.; 0.75 max

. . .

...

0.015

0.040

0.035

0.020^E

0.040

0.035

0.045

0.020

0.030

. . .

0.030

0.20 + 4 (C

. . .

5 × C min;

...

7 × (C + N)

(Ti + Cb)

...

(Ti + Cb) =

. . .

0.10–0.60

0.30–0.50

0.07–0.30

+ N) min;

0.75 max

but no less

0.20 + 4

0.20–1.00

0.20 + 4

0.20–1.00

1.10 max

than 0.20

(C + N)

and 6 ×

(C + N)

and 6 ×

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

A763 Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels

A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes

E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing

E273 Practice for Ultrasonic Testing of the Weld Zone of Welded Pipe and Tubing

ICS Code

ICS Number Code 23.040.10 (Iron and steel pipes)

Referencing This Standard

Link Here

Link to Active (This link will always route to the current Active version of the standard.)

DOI: 10.1520/A0268_A0268M-20

Citation Format

ASTM A268 / A268M-20, Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service, ASTM International, West Conshohocken, PA, 2020, www.astm.org