Material – BS 621
Standard Specification for Low Alloyed CrMo Steel; Steels for Pressure Purposes Plates
Group - Ferrous Mild Steel Alloys
Sub Group - BS 621 Low Alloyed CrMo Steel; Steels for Pressure Purposes Plates
Application - Intended for Valve, Pump, General Engineering, Automotive and Other Industries
Grade Belongs to the Industry - Plate
| Chemical Composition | ||
|---|---|---|
| Carbon | C % | 0.090 - 0.170 |
| Silicon | Si % | 0.500 - 0.800 |
| Manganese | Mn % | 0.400 - 0.650 |
| Phosphorus | P % | 0.025 max. |
| Sulphur | S % | 0.015 max. |
| Chromium | Cr % | 1.000 - 1.500 |
| Nickel | Ni % | 0.300 max. |
| Molybdenum | Mo % | 0.450 - 0.600 |
| Aluminium | Al % | 0.020 max. |
| Copper | Cu % | 0.300 max. |
| Iron | Fe % | Balance |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| Heat Treatment |
|---|
| Normalising or Annealing or Hardening + Tempering |
| Mechanical Properties | |
|---|---|
| Tensile Strength in Mpa | 420 - 690 |
| Yield Strength in Mpa | 275 min. |
| Elongation in % | 16 min. |
| Reduction of Area in % | - |
| Hardness in HB | 140 - 212 |
| Impact in Joule | 140 - 212 J @ RT |
Cross Reference Table
| Material | Standard | Country | Grade Belong to the Industry |
|---|---|---|---|
| 369 G-17 CrMo 5-5 | SFS | Finland | Casting |
| J12073 | UNS | USA | Casting |
| A541 G. 11 Class 4 | ASTM | USA | Forging |
| G 17 CrMo 5-5 | UNI | Italy | Casting |
| A217 WC11 | ASTM | USA | Casting |
| A217 WC6 | ASTM | USA | Casting |
| A356 6 | ASTM | USA | Casting |