Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes

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1.1 This specification covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes, designated Grades T5, TP304, etc. These steels are listed in Tables 1 and 2.

1.2 Grades containing the letter, H, in their designation, have requirements different from those of similar grades not containing the letter, H. These different requirements provide higher creep-rupture strength than normally achievable in similar grades without these different requirements.

1.3 The tubing sizes and thicknesses usually furnished to this specification are ¹/₈ in. [3.2 mm] in inside diameter to 5 in. [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm], inclusive, in minimum wall thickness or, if specified in the order, average wall thickness. Tubing having other diameters may be furnished, provided such tubes comply with all other requirements of this specification.

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

TABLE 1 Chemical Composition Limits, %^A, for Low Alloy Steel

Grade	UNS Designation	Composition, %
		Carbon	Manga- nese	Phospho- rus	Sul- fur	Silicon	Nickel	Chromium	Molybdenum	Vana- dium	Boron	Niobium	Nitrogen	Aluminum	Tungsten	Other Elements
T2	K11547	0.10-0.20	0.30-0.61	0.025	0.025^B	0.10-0.30	...	0.50-0.81	0.44-0.65	...	...	...	...	...	...	...
T5	K41545	0.15	0.30-0.60	0.025	0.025	0.50	...	4.00-6.00	0.45-0.65	...	...	...	...	...	...	...
T5b	K51545	0.15	0.30-0.60	0.025	0.025	1.00-2.00	...	4.00-6.00	0.45-0.65	...	...	...	...	...	...	...
T5c	K41245	0.12	0.30-0.60	0.025	0.025	0.50	...	4.00-6.00	0.45-0.65	...	...	...	...	...	...	Ti 4xC-0.70
T9	K90941	0.15	0.30-0.60	0.025	0.025	0.25-1.00	...	8.00-10.00	0.90-1.10	...	...	...	...	...	...	...
T11	K11597	0.05-0.15	0.30-0.60	0.025	0.025	0.50-1.00	...	1.00-1.50	0.44-0.65	...	...	...	...	...	...	...
T12	K11562	0.05-0.15	0.30-0.61	0.025	0.025^B	0.50	...	0.80-1.25	0.44-0.65	...	...	...	...	...	...	...
T17	K12047	0.15-0.25	0.30-0.61	0.025	0.025	0.15-0.35	...	0.80-1.25	...	0.15	...	...	...	...	...	...
T21	K31545	0.05-0.15	0.30-0.60	0.025	0.025	0.50-1.00	...	2.65-3.35	0.80-1.06	...	...	...	...	...	...	...
T22	K21590	0.05-0.15	0.30-0.60	0.025	0.025	0.50	...	1.90-2.60	0.87-1.13	...	...	...	...	...	...	...
T23	K40712	0.04-0.10	0.10-0.60	0.030	0.010	0.50	...	1.90-2.60	0.05-0.30	0.20-0.30	0.0005- 0.006	0.02-0.08	0.03	0.030	1.45-1.75	...
T24	K30736	0.05-0.10	0.30-0.70	0.020	0.010	0.15-0.45	...	2.20-2.60	0.90-1.10	0.20-0.30	0.0015- 0.007	...	0.012	0.02	...	Ti 0.06-0.10
T36	K21001	0.10-0.17	0.80-1.20	0.030	0.025	0.25-0.50	1.00-1.30	0.30	0.25-0.50	0.02	...	0.015-0.045	0.02	0.050	...	Cu 0.50-0.80
T91	K90901	0.07-0.14	0.30-0.60	0.020	0.010	0.20-0.50	0.40	8.0-9.5	0.85-1.05	0.18-0.25	...	0.06-0.10	0.030- 0.070	0.02	...	Ti 0.01 Zr 0.01
T92	K92460	0.07-0.13	0.30-0.60	0.020	0.010	0.50	0.40	8.5-9.5	0.30-0.60	0.15-0.25	0.001- 0.006	0.04-0.09	0.030- 0.070	0.02	1.5-2.00	Ti 0.01 Zr 0.01
T122	K91271	0.07-0.14	0.70	0.020	0.010	0.50	0.50	10.0-11.5	0.25-0.60	0.15-0.30	0.0005- 0.005	0.04-0.10	0.040- 0.100	0.02	1.50-2.50	Cu 0.30-1.70 Ti 0.01 Zr 0.01
T911	K91061	0.09-0.13	0.30-0.60	0.020	0.010	0.10-0.50	0.40	8.5-9.5	0.90-1.10	0.18-0.25	0.0003- 0.006	0.06-0.10	0.040- 0.090	0.02	0.90-1.10	Ti 0.01 Zr 0.01

^A Maximum, unless range or minimum is indicated. Where ellipses (...) appear in this table, there is no requirement, and analysis for the element need not be determined or reported.

^B It is permissible to order T2 and T12 with a sulfur content of 0.045 max. See 15.3.

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