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Home > Technical Information > Chemical Composition For Stud Bolts |
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Chemical Composition For Stud Bolts |
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| Grade of alloy steel for Stud-Bolts to BS 1750 , ASTM A 193 and A 320 |
| 1 |
SYMBOL |
B7 |
B7M |
B16 |
B8 |
B8M |
B8T |
L7 / L7M |
L43 |
| 2 |
Type |
Ferritic |
Ferritic |
Austenitic |
Austenitic
Unstabilized |
Asutenitic |
Austenitic Stabilized |
Ferritic |
Ferritic |
| 3 |
Service conditions |
High Temp. |
High Temp. |
High Temp. |
High Low. Temp. |
High Low. Temp. |
High Low. Temp. |
Low Temp. |
Low Temp. |
| 4 |
Material specification
ASTM |
A193 |
A193 |
A193 |
A193 |
A193 |
A193 |
A320 |
A320 |
| Grade B7 |
Grade B7M |
Gr. B16 |
Grade B8 |
Grade B8M |
Grade B8T |
Grade L7 |
GradeL43 |
| 5 |
Chemical composition |
% |
% |
% |
% |
% |
% |
% |
% |
| |
C. |
0.37---0.49 |
0.37---0.49 |
0.36---0.47 |
0.08 max. |
0.08 max. |
0.08 max. |
0.38---0.48 |
0.38---0.43 |
| |
Mn. |
0.65---1.10 |
0.65---1.10 |
0.45---0.70 |
2.00 max. |
2.00 max. |
2.00 max. |
0.75---1.00 |
0.60---0.85 |
| |
Si. |
0.15---0.35 |
0.15---0.35 |
0.15---0.35 |
1.00 max. |
1.00 max. |
1.00 max. |
0.15---0.35 |
0.15---0.35 |
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P. |
0.035 max. |
0.035 max. |
0.035 max. |
0.045 max. |
0.045 max. |
0.045 max. |
0.035 max. |
0.040 max. |
| |
S. |
0.04 max. |
0.04 max. |
0.04 max. |
0.030 max. |
0.030 max. |
0.030 max. |
0.040 max. |
0.040 max. |
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Cr. |
0.75---1.20 |
0.75---120 |
0.80---1.15 |
18.00---20.00 |
16.00---18.00 |
17.00---9.00 |
0.80---1.10 |
0.70---0.90 |
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Ni. |
--- --- |
--- --- |
--- --- |
8.00---10.50 |
10.00---14.00 |
9.00---12.00 |
--- --- |
1.65---2.00 |
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Mo. |
0.15---0.25 |
0.15---0.25 |
0.50---0.65 |
--- --- |
2.00---3.00 |
--- --- |
0.15-0.25 |
0.20---0.30 |
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V. |
--- --- |
--- --- |
0.25---0.35 |
--- --- |
--- --- |
--- --- |
--- --- |
--- --- |
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Ti. |
--- --- |
--- --- |
--- --- |
--- --- |
--- --- |
5xCMIN |
--- --- |
--- --- |
| 6 |
Brinell Hardness |
Not applicable |
max. 20 RC |
Not applicable |
223 B.H.N. max. |
223 B.H.N. max. |
223 B.H.N. max. |
Not applicable |
Not applicable |
| 7 |
Impact Value |
Not applicable |
Not applicable |
Not applicable |
Not applicable |
Not applicable |
Not applicable |
20 ft. lbf.
at 1500 F |
20 ft. lbf.
1500F min |
| 8 |
Physicalas per ASTM A 193 & B.S. 1506-621 & B.S. 4882. |
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U.T.S. |
88kg/MM2min |
70.3 min. |
88kg/MM2min |
52.75/MM2min |
52.75kg/MM2 |
52.75kg/MM2 |
88kg/MM2 |
88kg/MM2 |
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Elongation |
16% min |
18% min |
18% min |
30% min |
30% min |
30% min |
16% min |
16% min |
| |
Yield |
70.39kg/MM2 |
56.26 min. |
73.8kg/MM2 |
21.1kg/MM2min |
21.1kg/MM2 |
21.1kg/MM2 |
73.8kg/MM2 |
73.8kg/MM2 |
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Reduction area |
50% min |
50% min |
50% min |
50% min |
50% min |
50% min |
50% min |
50% min |
| 9 |
Heat treatment |
Oil quenched & tempered |
Oil quenched & tempered |
Oil quenched & tempered |
Carbide solution treated |
Carbide solution treated |
Carbide solution treated |
Oil quenched & tempered |
Oil quenched & tempered |
| 10 |
Tempering temperature |
11000F min 5930C |
11500F min 6200C |
12000F min 6500C |
--- --- |
--- --- |
--- --- |
11000F min 5930C min |
11000F min 5930C min |
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