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ASTM A826-88 / ASME SA 826

AUSTENITIC AND FERRITIC STAINLESS STEEL DUCT TUBES FOR BREEDER
REACTOR CORE COMPONENTS

This standard is issued under the fixed designation A 826; 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 specification covers seamless, annealed or cold worked, austenitic or ferritic stainless steel 
duct tubes of 2 to 7-in. (50 to 178-mm) outside dimensions with wall thickness breeder reactor plants.

1.2 The values stated in inch-pound units are to be regarded as the standard.

Chemical composition

Grade Mfg. Process Chemical composition(%)
C Si Mn P S Ni Cr Mo Others
TP316 S 0.040~0.060 0.50~0.75 1.00~2.00 0.040Max 0.010Max 13.0~14.0 17.0~18.0 2.00~3.00 Cb 0.50Max Ta 0.20Max N 0.010Max Al 0.050Max As 0.030Max B 0.0020Max Co 0.050Max Cu 0.04Max V 0.05Max
S38660 S 0.030~0.050 0.50~1.00 1.65~2.35 0.040Max 0.010Max 14.5~16.5 12.5~14.5 1.50~2.50 Cb 0.050Max Ta 0.20Max N 0.005Max Al 0.0050Max As 0.030Max B 0.020Max Co 0.050Max Cu 0.04Max V 0.05Max
S42100 S 0.17~0.23 0.20~0.30 0.40~0.70 0.040Max 0.010Max 0.30~0.80 11.0~12.5 0.80~1.25 Cb 0.05Max W 0.40~0.60 Al 0.050Max V 0.25~0.35
T91 S 0.08~0.12 0.20~0.50 0.30`0.60 0.020Max 0.010Max 0.040Max 8.00~9.50 0.85~1.05 Cb 0.06~0.10 N 0.030~0.070 Al 0.040Max V 0.18~0.25




Mechanical Properties 

Grade   Tensile Test MPa or N/mm2 Remaks (Similar to JIS) Possibility Temperature
Min Yield point Tensile Strength
TP316 585~795 690~895 -
S38660 - - -
S42100 - - -
T91 - - -




TABLE 1 Chemical Reuqirements of Duct Tubes 

Grade
UNS Designation		 TP 316
S31600		 ...
S38660		 ...
S42100		 T91
...
Carbon 0.40-0.060 0.30-0.050 0.17-0.23 0.08-0.12
Manganese 1.00-2.00 1.65-2.35 0.40-0.70 0.30-0.60
Phosphorus, max 0.040 0.040 0.040 0.020
Sulfur, max 0.010 0.010 0.010 0.010
Silicon 0.50-0.75 0.50-1.00 0.20-0.30 0.20-0.50
Nickel 13.0-14.0 14.5-16.5 0.30-0.80 0.40max
Chromium 17.0-18.0 12.5-14.5 11.0-12.5 8.00-9.50
Molybdenum 2.00-3.00 1.50-2.50 0.80-1.20 0.85-1.05
Titanium ... 0.10-0.40c ... ...
Columbium 0.05max 0.050max 0.050max 0.06-0.10
Tantalum, max 0.020 0.020 ... ...
Tungsten ... ... 0.40-0.60 ...
Nitrogen 0.010max 0.005max ... 0.030-0.070
Aluminum, max 0.050 0.050 0.050 0.04
Arsenic, max 0.030 0.030 ... ...
Boron, max 0.0020 0.0020 .... ...
Cobalt, max 0.050 0.050 .... ...
Copper, max 0.04 0.04 .... ...
Vanadium 0.05max 0.05max 0.25-0.35 0.18-0.25


AAim for 0.25

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