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ASTM A268/A268M-24

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 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
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Most recent

ASTM A268/A268M-24

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

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