ASTM A790 / ASME SA790 / Welded Unannealed Ferritic Stainless Steel Tubing supplier & distributor in India

ASTM A790M-89

ASME SA 790 SEAMLESS AND WELDED FERRITIC/AUSTENTIC STAINLESS STEEL PIPE1

This standard is issued under the fixed designation A 790; 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 ( ε) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This specification² covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stree corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

1.2 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplememtary requirements call for additional tests to be made and when desired, one or more of these may be specified in the order.

1.3 Table X1.1 of this specification lists the dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.

1.4 The values stated in either inch-pound units or SI units are to be regarede 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 valuses 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 1-The dimensionless designator NPS (nominal pipe size)has been substituted in standard for such traditional terms as "nominal diameter,""size,"and "nominal size."

TABLE 1 Heat Treatment

UNS Designation	Temperature	Quench
S310803	1870-2010? [1020-1100?]	Rapid cooling in air or water
S31500	1800-1900? [980-1040?]	Rapid cooling in air or water
S32500	1900? [1040?]min	Rapid cooling in air or water
S31200	1920-2010? [1050-1100?]	Rapid cooling in water
S31260	1870-2010? [1020-1100?]	Rapid cooling in water
S32304	1700-1920? [925-1050?]	Rapid cooling in air or water
S32750	1920-2060? [1025-1125?]	Rapid cooling in air or water
S32900	1700-1750? [925-955?]	Rapid cooling in air or water
S32950	1820-1880? [990-1025?]	Air cool

At the request of the purchaser's inspector, an analysis of one billet or one length of flat-rolled stock from each heat,
or two pipes from each of flat-rolled stock from each heat, or two pipe from each lot shall be made by the manufacturer.
A lot of pipe shall consist of the following number of lengths of the same size andn wall thickness from any one heat of steel :

NPS Designator	Lengths of Pipe in Lot
Under 2	400 of fraction thereof
2 to 5, incl	200 or fraction thereof
6 and over	100 or fraction thereof

TABLE 2 Chemical Requirements

UNS Desi- gnationA	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu	Others
S310803	0.030max	2.0max	0.030max	0.020max	1.0max	4.50-6.50	21.0-23.0	2.50-3.50	0.08-0.20	...	...
S31500	0.030max	1.20 -2.00	0.030max	0.030max	1.40 -2.00	4.25-5.25	18.0-19.0	2.50-3.00	0.02-0.1	...	...
S32500	0.040	1.5max	0.040max	0.030max	1.0max	4.50-6.50	24.0-27.0	2.90-3.90	0.10-0.25	1.5 -2.5	...
S31200	0.030max	2.0 max	0.045max	0.030max	1.0max	5.50-6.50	224.0-26.0	1.20-2.00	0.14-0.20	...	...
S31260	0.030max	1.00max	0.030max	0.030max	0.75max	5.50-7.50	24.0-26.0	2.50-3.50	0.10-0.30	0.20 -0.80	W0.10 -0.50
S32304	0.030max	2.50max	0.040max	0.040max	1.0max	3.0-5.5	21.5-24.5	0.05-0.60	0.05-0.20	0.05 -0.06	...
S32750	0.030max	1.2max	0.035max	0.020max	0.8max	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.5max	...
S32900	0.08max	1.00max	0.040max	0.030max	0.75max	2.50-5.00	23.00-28.00	1.00-2.00	...	...	...
S32950	0.03max	2.00 max	0.035max	0.010max	0.60max	3.50-5.20	26.00-29.00	1.00-2.50	0.15-0.35	...	...

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

TABLE 3 Tensile and Hardness Requirements

UNS Designation	Tensile Strength, min, ksi [MPa]	Yield Strength, min, ksi [MPa]	Elongation in 2in. or 50mm min, %	Hardness, max
UNS Designation	Tensile Strength, min, ksi [MPa]	Yield Strength, min, ksi [MPa]	Elongation in 2in. or 50mm min, %	Brinell	Rockwell C
S31803	90[620]	65[450]	25	290	30.5
S31500	92[630]	64[440]	30	290	30.5
S32550	110[760]	80[550]	15	297	31.5
S31200	100[690]	65[450]	25	280	...
S31260A	100[690]	65[450]	25	...	...
S32304	87[600]	58[400]	25	290	30.5
S32750	116[800]	80[550]	15	310	32
S32900	90[620]	70[485]	20	271	28
S32950B	100[690]	70[480]	20	290	30.5

APrior to A 789/A 789M-87, the values for S31260 were : 92 ksi tensile strength,

54 ksi yield strength, and 30% elongation.

BPrior to A 789/A 789M-89, the tensile strength value was 90 ksi for UNS S32950.

APPENDIX X1. TABLE X1.1 IS BASED ON TABLE 1 OF THE AMERICAN NATIONAL STANDARD FOR

STAINLESS STEEL PIPE (ANSI B36.19-1965)

TABLE X1.1 Dimensions of Welded and Seamless Stainless Steel Pepe

NOTE - The decimal thickness listed for the respective pipe sizes represents nominal or average wall dimensions.

NPS Deisgnator	Outside Diameter				Norminal Wall Thickness
	in.	mm	Schedule 5SA		Schedule 10SAS		Schedule 40S		Schedule 80S
	in.	mm	in.	mm	in.	mm	in.	mm	in.	mm
1/8	0.405	10.29	...	...	0.049B	1.25	0.068	1.73	0.095	2.41
1/4	0.540	13.72	...	...	0.065B	1.65	0.088	2.24	0.119	3.02
3/8	0.675	17.15	...	...	0.065B	1.65	0.091	2.31	0.123	3.20
1/2	0.840	21.34	0.065B	1.65	0.083B	2.11	0.109	2.77	0.147	3.73
3/4	1.050	26.67	0.065B	1.65	0.083B	2.11	0.113	2.87	0.154	3.91
1.0	1.315	33.40	0.065B	1.65	0.109B	2.77	0.133	3.38	0.179	4.55
1 1/4	1.660	42.16	0.065B	1.65	0.109B	2.77	0.140	3.56	0.191	4.85
1 1/2	1.900	48.26	0.065B	1.65	0.109B	2.77	0.145	3.68	0.200	5.08
2	2.375	60.33	0.065B	1.65	0.109B	2.77	0.154	3.91	0.218	5.54
2 1/2	2.875	73.03	0.083	2.11	0.120B	3.05	0.203	5.16	0.276	7.01
3	3.500	88.90	0.083	2.11	0.120B	3.05	0.216	5.49	0.300	7.62
3 1/2	4.000	101.60	0.083	2.11	0.120B	3.05	0.226	5.74	0.318	8.08
4	4.500	114.30	0.083	2.11	0.120B	3.05	0.237	6.02	0.337	8.56
5	5.563	141.30	0.109B	2.77	0.134B	3.40	0.258	6.55	0.375	9.52
6	6.625	168.28	0.109	2.77	0.134B	3.40	0.280	7.11	0.432	10.97
8	8.625	219.08	0.109B	2.77	0.134B	3.76	0.322	8.18	0.500	12.70
10	10.750	273.05	0.134B	3.40	0.065B	4.19	0.365	9.27	0.500B	12.70B
12	12.750	323.85	0.156B	3.96	0.080B	4.57	0.375B	9.52B	0.500B	12.70B
14	14.000	355.60	0.156B	3.96	0.188	4.78	...	...	...	...
16	16.000	406.40	0.165B	4.19	0.188	4.78	...	...	...	...
18	18.000	457.20	0.165B	4.19	0.188	4.78	...	...	...	...
20	20.000	508.00	0.188B	4.78	0.218B	5.54	...	...	...	...
22	22.000	558.80	0.188B	4.78	0.218B	5.54	...	...	...	...
23	24.000	609.60	0.218B	5.54	0.250	6.35	...	...	...	...
30	30.000	762.00	0.250	6.35	0.312	7.92	...	...	...	...

ASchedules 5S and 10S wall thicknesses do not permit threadingn in accordance with the American National Standard

for Pipe Treads (ANSI B1.20.1)/ BThese do not conform to the American National Standard for Welded and Seacless

Wrought Steel Pipe (ANSI B36.10-1979).

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