BS 1501 PART 2 621 gr. A,B steel plate/sheet, BS 1501 PART 2 621 gr. A,B steel plate/sheet, under BS 1501 PART 2 standard, we can regard 621 gr. A,B steel plate/sheet for steel with Cr., Mo.,Cr-Mo steels used for high temperature and pressure vessels.
621 gr. A,B steel plate is a kind of steel which with Cr., Mo., Cr-Mo that mainly applied for high temperature and pressure vessels. The steel grade 621 gr. A,B is according to BS 1501 PART 2 standard which with the yield strength of 228MPa.The followings are the chemical composition and mechanical properties of BS 1501 PART 2 621 gr. A,B steel plate.
621 gr. A,B steel chemical composition
| Grades | C | Mn | S | P | Si | Cr | Ni | Cu | Mo | Nb+V+Ti |
| 621 gr. A,B | 0.05- 0.17 |
0.40- 0.65 |
0.035 max |
0.035 max |
0.50- 0.80 |
1.0- 1.5 |
- | - | 0.45- 0.60 |
- |
621 gr. A,B steel Mechanical properties
| Grade |
Permissible yield point ratio |
Yield Strength MPa(min) |
Tensile Strength MPa |
Elongation % (min) |
| 621 gr. A,B | - | 228 | 380-550 | 22 |
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