Black hollow square steel pipe parameters:Wall thickness: 0.5mm-16mmLength: 5.5 meters, 5.8 meters, 6 meters, 11.8 meters, 12 meters, etc., other length can be selected according to user requirements.External diameter: 6.5 x6.5mm - 400 x400mmTolerance: wall thickness ± 0.05mm length ±6mm diameter ±

There is no free oxygen in the completely pressed carbon steel alloy.In simple terms, deoxidized or completely killed steels are produced without oxygen by adding a reagent before casting.Therefore, anoxia does not promote gas evolution during alloy solidification.This means that the fully killed ca