|
Chemical Requirements |
||||
|---|---|---|---|---|
|
Elment |
Composition, % |
|||
|
Grade B |
Grade C |
|||
|
Heat |
Product |
Heat |
Product |
|
|
Carbon, max |
0.2 |
0.22 |
0.22 |
0.24 |
|
Manganese |
1.15-1.50 A |
1.07-1.652 A |
1.15-1.50 |
1.07-1.62 |
|
Phosphorus, max |
0.025 |
0.025 |
0.025 |
0.025 |
|
Sulfur, max |
0.025 |
0.025 |
0.025 |
0.025 |
|
Silicon |
0.15-0.50 |
0.10-0.55 |
0.15-0.50 |
0.10-0.55 |
|
Vanadium |
... |
... |
0.04-0.11 |
0.03-0.12 |
|
Columbium, max |
0.05 |
0.05 |
0.05 |
0.05 |
|
Nitrogen |
... |
... |
0.03 |
0.03 |
A. The maximum manganese may be increased to 1.60% o heat analysis and 1.72% on product analysis, provided that the carbon content on heat analysis does not exceed 0.18%.
Mechanical Requirements
ASTM A737 plates tension test specimens shall conform to the requirements shown in Table 2.
For nominal plate thickness of 3/4 in. [20 mm] and under, when requirements for elongation in 2 in. [50 mm] are to be determined, the 1 1/2 in. [40 mm] wide rectangular specimen may be used for tension test, and the elongation may be determined in a 2 in. [50 mm] gage length that includes the fracture and that shows the greatest elongation.
|
Tensile Requirements |
||
|---|---|---|
|
|
Grade B |
Grade C |
|
Yield strength, min, ksi [MPa] |
50 [345] |
60 [415] |
|
Tensile strength, ksi [MPa] |
70-90 [485-620] |
80-100 [550-690] |
|
Elongation in 8 in. [200 mm], min, % A |
18 |
18 |
|
Elongation in 2 in. [50 mm], min, % A |
23 |
23 |
A See Specification A20/A20M for elongation adjustment.
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