A709Gr50 low-alloy high-strength structural steel plate

A709Gr50 low-alloy high-strength structural steel plate is widely used in engineering structures, such as construction steel structures, construction machinery, mining and mountain machinery, trucks, bridges, pressure vessels, etc., especially for construction and engineering machinery parts that require good weldability and toughness.

Chemical composition and melting analysis of A709Gr50 steel plate:

Grade	C	Si	Mn	P	S	Nb
A709Gr50	≤0.20	≤0.40	≤1.50	≤0.04	≤0.05	0.005-0.05

Mechanical properties of A709Gr50 steel plate:

Grade	σs，MPa	σb，MPa	δ200，%	0℃ Akv，J
A709Gr50	≥345	≥450	≥18	≥34

Note: Charpy impact test should be carried out in accordance with customer requirements.

A709Gr50 low-alloy high-strength structural steel plate smelting method:
Converter / electric furnace steelmaking → LF furnace refining → VD furnace vacuum degassing → continuous casting / die casting / electroslag → cleaning and heating → rolling → flaw detection → heat treatment → steel plate finishing → sampling → performance inspection.