The strict quality control of NM400 material use for tower processing

In determining the type of NM400 material use for tower, stainless steel products to be selected, the main considerations are the required aesthetic standards, the corrosivity of the local atmosphere and the cleaning system to be adopted. For example, 304 stainless steel is widely used in curtain wall, side wall, roof and other building applications, but in the corrosive industrial or marine atmosphere, it is better to use 316 stainless steel.

The alloying principle of low alloy high strength steel plate mainly uses solid volume strengthening, fine grain strengthening and precipitation strengthening produced by alloy elements to improve the strength of low alloy high strength steel plate, NM400 material use for tower. At the same time, the effect of fine grain strengthening on the reduction of ductile brittle transition temperature of low alloy high strength steel platel is used to offset the adverse effect of carbon nitride precipitation strengthening on the rise of ductile brittle transition temperature of steel, so that low alloy high strength steel plate can obtain high strength while maintaining good low temperature performance.

Tempering the important NM400 material use for tower welding structure often use high temperature tempering to remove residual weld stress. Classification: high temperature tempering above 400 ℃, medium temperature tempering 250 ~ 400 ℃, low temperature tempering 150 ~ 250 ℃, Quenching +Tempering is improve NM400 material use for tower strength, plasticity and toughness.

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