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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
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
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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