ASTM International - ASTM A268/A268M-20

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

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Organization: ASTM International
Publication Date: 1 March 2020
Status: active
Page Count: 7
ICS Code (Iron and steel pipes): 23.040.10
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 0.010 0.030 0.025 0.030 0.015

C

0.03 0.03 0.08 0.030
Mn, max 1.00 1.00 0.5-1.0 1.00 0.40 0.75 1.00 0.30 0.30 1.00 1.00 1.00 0.5 1.50 1.00 1.00 1.00
P, max 0.040 0.040 0.03 0.040 0.02 0.040 0.040 0.025 0.025 0.040 0.040 0.040 0.020 0.040 0.040 0.045 0.040
S, max 0.030 0.030 0.03 0.030 0.02 0.020 0.030 0.020 0.020 0.030 0.030 0.030 0.005 0.015 0.015 0.030 0.030
Si, max 1.00 1.00 0.60 1.00 0.40 0.75 1.00 0.20 0.20 1.00 0.75 1.00 0.50 1.00 1.00 1.00 1.00
Ni 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
Cr 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 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        
Mo ... ... 0.5-1.0 ... 0.75-1.50 0.75-1.50 1.75-2.50 3.5-4.2 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 0.15 . . . ... ... ... ... ... ... ... ... ... . . . . . . . . . . . . . . .
Cu, max ... ... . . . ... 0.2 0.20 ... 0.15 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

0.020

E

0.040 0.035 0.045 0.020 0.030 . . . . . . 0.030
Ti 0.20 + 4 (C   . . . 5 × C min; ... 7 × (C + N) (Ti + Cb) ... ... (Ti + Cb) = (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 ×          
             min; 1.00  min; 0.80      (C + N)  min to  (C+ N)          
             max  max      min  0.80 max  min          
                                   
Cb ...   . . . ... 0.05-0.20 ... ... ... ... ... ... ... 0.15-
0.50

F

. . . (3 × %C + 0.30) min . . . 0.10-0.60
                                  (Ti + Cb) =
                                  0.20 +4(C+N)
                                  min;0.80 max

1.2 An optional supplementary requirement is provided, and when desired, shall be so stated in the order.

1.3 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 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. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

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.

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... View More

Document History

ASTM A268/A268M-20
March 1, 2020
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
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...
September 1, 2016
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
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...
April 1, 2010
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
September 1, 2005
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
March 1, 2005
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
September 1, 2004
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
May 1, 2004
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
September 10, 2003
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
March 10, 2001
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
March 10, 2001
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
1.1 This specification 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...
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
A description is not available for this item.
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