ASTM A387 Grade 12 Class 2
A387 Grade 12 Class 2 is a high quality chrome molybdenum steel which is ideal for elevated temperature service and offers excellent anti corrosion characteristics.
The steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.
Equivalents
| BS | EN | ASTM/ASME | DIN |
|---|---|---|---|
| 620B | 13CrMo45 | A/SA387-12-2 | 13CrMo44 |
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) | Nominal Molybdenum Content (%) |
|---|---|---|
| A387 Grade 12 | 1.00% | 0.50% |
Tensile Requirements for Class 2 Plates
| Designation | Requirement | Grade 12 |
|---|---|---|
| A387 Grade 12 | Tensile strength, ksi [MPA] | 65 to 85 [450 to 585] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 40 [275] | |
| Elongation in 8 in. [200mm], min % | 19 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % |
Chemical Requirements:
| Carbon (C) | % |
| Heat Analysis: Product Analysis: | 0.05 - 0.17 0.04 - 0.17 |
| Manganese (Mn) | % |
| Heat Analysis: Product Analysis: | 0.40 - 0.65 0.35 - 0.73 |
| Phosphorus (P) | % |
| Heat Analysis: Product Analysis: | 0.035 0.035 |
| Sulphur (S) (Max) | % |
| Heat Analysis: Product Analysis: | 0.035 0.035 |
| Silicon (Si) | % |
| Heat Analysis: Product Analysis: | 0.15 - 0.40 0.13 - 0.45 |
| Chromium (Cr) | % |
| Heat Analysis: Product Analysis: | 0.80 - 1.15 0.74 - 1.21 |
| Molybdenum (Mo) | % |
| Heat Analysis: Product Analysis: | 0.45 - 0.60 0.40 - 0.65 |