ASME SA387 and ASTM A387 Chrome Moly Plate for Boiler
Most commonly used steel specifications for Chrome Moly plate are ASME SA387 and ASTM A387
- Chemical and mechanical properties of the ASME and ASTM specifications are the same.
- Brown McFarlane supplies Chrome Moly plates to ASME SA387 and ASTM A387 both from stock and, where required by the customer, cut to size and shape.
- SA387 and A387 are described as a “Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum.
Chemical Requirements
| GR. 2 | GR. 12 | GR. 11 | GR. 22 | GR. 22L | GR. 21 | GR. 21L | GR. 5 | GR. 9 | GR. 91* | |
| C | 0.05-0.21 | 0.05-0.17 | 0.05-0.17 | 0.05-0.15 | 0.10 | 0.05-0.15 | 0.10 | 0.15 | 0.15 | 0.08-0.12 |
| Mn | 0.55-0.80 | 0.40-0.65 | 0.40-0.65 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 |
| P | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.020 |
| S | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.010 |
| Si | 0.15-0.40 | 0.15-0.40 | 0.50-0.80 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 1.00 | 0.20-0.50 |
| Cr | 0.50-0.80 | 0.80-1.15 | 1.00-1.50 | 2.00-2.50 | 2.00-2.50 | 2.75-3.25 | 2.75-3.25 | 4.00-6.00 | 8.00-10.00 | 8.00-9.50 |
| Mo | 0.45-0.60 | 0.45-0.60 | 0.45-0.65 | 0.90-1.10 | 0.90-1.10 | 0.90-1.10 | 0.90-1.10 | 0.45-0.65 | 0.90-1.10 | 0.85-1.05 |
| V | – | – | – | – | – | – | – | – | 0.04 | 0.18-0.25 |
Tensile Requirements
Class 1 Plates
| GRADE | TENSILE (MPA) | YIELD (MPA) | ELONG. (50MM) | REDUC’N OF AREA* |
| 2, 12 | 380 – 550 | 230 min | 22% min | – |
| 11 | 415 – 585 | 240 min | 22% min | – |
| 22, 21, 5, 9 | 415 – 585 | 205 min | 18% min | 40% min |
| 21L, 22L | 415 – 585 | 205 min | 18% min | 40% min |
Class 2 Plates
| GRADE | TENSILE (MPA) | YIELD (MPA) | ELONG. (50 MM) | REDUC’N OF AREA* |
| 2 | 485 – 620 | 310 min | 22% min | – |
| 11 | 515 – 690 | 310 min | 22% min | – |
| 12 | 450 – 585 | 275 min | 22% min | – |
| 22, 21, 5, 9 | 515 – 690 | 310 min | 18% min | 40% min |
| 91 | 585 – 760 | 415 min | 18% min | – |
