Heat treatment process and purpose of weldability of nm400 plate

ASTM A572 Grade 50, used in large-scale construction, weldability of NM400 plate is an extremely strong alloy with a yield strength of 65,000 psi, an allowable bending stress of 39,000 psi and a future as the high-performance replacement of ASTM A36 steel.

Just as weldability of NM400 plate, the boiler steel plate also has strict control of chemical composition for the material, especially harmful elements such as phosphorus and sulfur, and residual elements such as chromium, nickel, and copper; during smelting, good deoxidation and removal of non-metallic inclusions should be carried out to ensure good quality, plasticity and toughness. The organizational structure requires uniformity, and the grain size is controlled within a certain range; there are also strict requirements for surface quality and internal defects. In addition, the boiler steel plate mechanical properties at room temperature and high temperature must be guaranteed.

Weathering steel generally adopts the process route of fine material into the furnace-smelting (converter, electric furnace-microalloying treatment-argon blowing-LF refining-low superheat continuous casting (feeding rare earth wire)-controlled rolling and cooling. The scrap steel is added into the furnace together with the charge, and smelted according to the conventional process. After the weldability of NM400 plate steel is tapped, deoxidizers and alloys are added. After the molten steel is treated with argon blowing, the molten steel is cast. By adding rare earth elements to the steel, the weldability of NM400 plate weathering steel is purified and the content of inclusions is greatly reduced.

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Our company will accept the product quality objection registration record, pass it to the weldability of NM400 plate production unit and relevant departments, and timely coordinate the supervision of product weldability of NM400 plate quality objection. Our company coordinates the relevant department personnel to the customer unit to carry on the investigation, the processing.