SA387 Grade 11 Class 2 pressure vessel steel plate

SA387 Grade 11 Class 2 steel plate is an American standard ASTM pressure vessel steel plate. It belongs to the chrome-molybdenum alloy steel plate for pressure vessels. It has the performance of preventing hydrogen embrittlement, hydrogen corrosion, hydrogen stripping and sulfide corrosion in the medium temperature (350-480℃) hydrogen environment, and has good low backfire brittleness. It uses special smelting means to reduce the content of phosphorus so that SA387 has high brittleness resistance and good impact toughness under low temperature environment. Therefore, SA387 steel plate is widely used in the pressure vessel manufacturing industry.

SA387 Grade 11 Class 2 pressure vessel steel plate chemical composition:
Carbon C: 0.05-0.17
Manganese Mn: 0.40-0.65
Phosphorus P: 0.035
Sulfur S: 0.035
Silicon Si: 0.50-0.80
Chromium Cr: 1.00-1.50
Mo: 0.45-0.65

SA387 Grade 11 Class 2 steel plate mechanical properties:
tensile strength σb (MPa):≥440(45)
yield strength σs (MPa):≥295(30)
elongation δ5 (%):≥22
Reduction of area ψ(%):≥60
Impact energy Akv (J): ≥ 94
Impact toughness value αkv (J/cm2):≥118(12)
Hardness: ≤ 179HB
Sample size: sample blank size is 30mm.

Heat treatment specification and metallographic structure: heat treatment specification: quenching 900 ℃, air cooling; Tempering 650 ℃, air cooling.

SA387 Grade 11 Class 2 pressure vessel steel plate delivery status: controlled rolling, normalizing rolling, normalizing, tempering, normalizing and tempering, rapid cooling, quenching and tempering, etc. PS: The specific delivery status shall be indicated in the contract.