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Chrome Molybdenum Steel - ASTM A387 Grade 91 Class 2
The high quality A387 Grade 91 Class 2 is produced at some of the finest steel mills in the world. This chrome–molybdenum alloy has excellent resistance to high working temperatures, which make it perfect for use in the chemical, power generation, oil and gas industry applications. Masteel supplies to fabricators who serve these industries on a global basis.
Masteel’s plates can be supplied either directly from the mill or from its own stockholding – all plates come with individual stampings and mill test certification. Third party testing can also be arranged at the customers request.
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) | Nominal Molybdenum Content (%) |
|---|---|---|
| A387 Grade 91 | 9.00% | 1.00% |
Tensile Requirements for Class 2 Plates
| Designation | Requirement | Grade 91 |
|---|---|---|
| A387 Grade 91 | Tensile strength, ksi [MPA] | 85 to 110 [585 to 760] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 60 [415] | |
| Elongation in 8 in. [200 mm], min % | ||
| Elongation in 2 in. [50 mm], min, % | 18 | |
| Reduction of area, min % |
Chemical Requirements
| . | . |
|---|---|
| Carbon (C) | % |
| Heat Analysis:Product Analysis: | 0.08 - 0.120.06 - 0.15 |
| Manganese (Mn) | % |
| Heat Analysis:Product Analysis: | 0.30 - 0.600.25 - 0.66 |
| Phosphorus (P) | % |
| Heat Analysis:Product Analysis: | 0.0200.025 |
| Sulphur (S) (Max) | % |
| Heat Analysis:Product Analysis: | 0.0100.012 |
| Silicon (Si) | % |
| Heat Analysis:Product Analysis: | 0.20 - 0.500.18 - 0.56 |
| Chromium (Cr) | % |
| Heat Analysis:Product Analysis: | 8.00 - 9.507.90 - 9.60 |
| Molybdenum (Mo) | % |
| Heat Analysis:Product Analysis: | 0.85 - 1.050.80 - 1.10 |
| Nickel (Ni) | % |
| Heat Analysis:Product Analysis: | 0.400.43 |
| Vanadium (Vn) | % |
| Heat Analysis:Product Analysis: | 0.18 - 0.250.16 - 0.27 |
| Columbium (Nb) | % |
| Heat Analysis:Product Analysis: | 0.06 - 0.100.05 - 0.11 |
| Nitrogen (N) | % |
| Heat Analysis:Product Analysis: | 0.030 - 0.0700.025 - 0.080 |
| Aluminium (Al) | % |
| Heat Analysis:Product Analysis: | 0.020.02 |
| Titanium (Ti) | % |
| Heat Analysis:Product Analysis: | 0.010.01 |
| Zirconium (Zr) | % |
| Heat Analysis:Product Analysis: | 0.010.01 |
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