ASME SA285 Grade B (SA285GR.B) carbon steel plates are a low- to intermediate-tensile strength material specified for fusion-welded pressure vessels and boilers, offering good ductility for forming and moderate resistance to stress.This grade is equivalent to ASTM A 285 Grade B, emphasizing weldability without alloys, making it economical for non-corrosive services. Compared to ASTM A 285 Grade A, it provides higher strength for slightly elevated pressures, with astm a285 grade equivalent material often being EN P265GH for similar low-pressure uses.
Steel Standard:ASME SA285/SA285M
Rolling Type:Boiler steel plate,Pressure vessel steel plate
Thickness:5mm-300mm
Width:1500mm-4200mm
Length:3000mm-18000mm
Heat Treatment:As Rolled/Normalised/Stress relieved
Mechnical property for SA285 Grade B boiler steel plate:
| Yield strength (≥Mpa) | Tensile strength (Mpa) | Elongation in ≥,% | |
| 185 | 345-485 | 200mm | 50mm |
| 25 | 28 | ||
Chemical composition for SA285 Grade B boiler steel plate (Product Analysis Max%)
| Main chemical elements composition of SA285 Grade B | ||||
| C | Si | Mn | P | S |
| 0.22 | 0.08-0.45 | 0.98 | 0.035 | 0.035 |
Applications and Advantages in Pressure Vessel Systems
SA285 Grade B is applied in low- to moderate-pressure tanks, boilers, and exchangers, offering easy welding without preheating.
In India, it's popular for refinery vessels due to moderate cost. Advantages include affordability over higher-strength steels and good ductility in mild conditions.
