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Chapter 7
Steel Fasteners
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CHEMICAL COMPOSITION OF STEEL
BOLTING FOR HIGH TEMPERATURE SERVICEe
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ASTM A 193 |
AISI |
C |
Mn |
Si |
Cr |
Ni |
Mo |
Others |
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Ferritic Steels |
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B5 |
501 |
0.10c |
1.00 |
1.00 |
4.00-6.00 |
--- |
0.40-0.65 |
--- |
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B6, B6X |
410 |
0.15 |
1.00 |
1.00 |
11.50-13.50 |
--- |
--- |
--- |
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B7, B7M |
4140a |
0.37-0.49d |
0.65-1.10 |
0.15-0.35 |
0.75-1.20 |
--- |
0.15-0.25 |
--- |
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B16 |
--- |
0.36-0.47 |
0.45-0.70 |
0.15-0.35 |
0.80-1.15 |
--- |
0.50-0.65 |
0.25-0.35 V |
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Austenitic Steels |
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B8, B8A |
304 |
0.08 |
2.00 |
1.00 |
18.00-20.00 |
8.00-10.50 |
--- |
--- |
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B8C, B8CA |
347 |
0.08 |
2.00 |
1.00 |
17.00-19.00 |
9.00-13.00 |
--- |
Cb = 10 X Cc |
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B8M, B8MA, |
316 |
0.08 |
2.00 |
1.00 |
16.00-18.00 |
10.00-14.00 |
2.00-3.00 |
--- |
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B8M2, B8M3 |
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B8N, B8NA |
304N |
0.08 |
2.00 |
1.00 |
18.00-20.00 |
8.00-10.50 |
--- |
0.10-0.16 N |
|
B8MN, B8MNA |
316N |
0.08 |
2.00 |
1.00 |
16.00-18.00 |
10.00-14.00 |
2.00-3.00 |
0.10-0.16 N |
|
B8P, B8PA |
305b |
0.08 |
2.00 |
1.00 |
17.00-19.00 |
10.50-1300 |
--- |
--- |
|
B8MLCuN |
--- |
0.02 |
1.00 |
0.80 |
19.50-20.50 |
17.50-18.50 |
6.00-6.50 |
0.18-0.22 n, |
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B8MLCuNA |
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0.50-1.00 Cu |
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B8T, B8TA |
321 |
0.08 |
2.00 |
1.00 |
17.00-19.00 |
9.00-12.00 |
--- |
Ti = 5 X Cc |
|
B8R, B8RA |
--- |
0.06 |
4.00-6.00 |
1.00 |
20.50-23.50 |
11.50-13.50 |
1.50-3.00 |
0.20-0.40 N, |
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0.10-0.30 V, |
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0.10-0.30 Cu+Ta |
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B8S, B8SA |
--- |
0.10 |
7.00-9.00 |
3.50-4.50 |
16.00-18.00 |
8.00-9.00 |
--- |
0.08-0.18 n |
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B8LN, B8LNA |
340Nb |
0.30 |
2.00 |
1.00 |
18.00-20.00 |
8.00-10.50 |
--- |
0.10-0.16 n |
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Austenitic Steels |
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B8MLN, B8MLNA |
316Nb |
0.30 |
2.00 |
1.00 |
16.00-18.00 |
10.00-14.00 |
2.00-3.00 |
0.10-0.16 n |
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a. Also includes AISI types 4142, 4145, 4140H, 4142H, 4145H. |
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b. AISI type as designated, with restricted carbon content. |
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c. Minimum value. |
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d. For bar sizes 3.5" and over, carbon content may be 0.50% max. For
B7M grade, a minimum carbon content of 0.28 % is permitted, |
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provided that the required tensile properties are met in the section
sizes involved; the use of AISI 4130 0r 4130H is allowed. |
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Single values are maximums, unless otherwise specified. |
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