How to deal with iron oxide residual problem of S275M steel

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40B steel plate is alloy structural steel plate formed by adding boron to the carbon structural steel with a carbon content of 0.40%. S275M steel, 40B steel plate has high hardness, toughness and hardenability, and has good comprehensive mechanical properties after quenching and tempering, which can be used instead of 40Cr steel. 40B steel plate chemical elements: C: 0.37-0.44, Si: 0.17-0.37, Mn: 0.60-0.90, B: 0.0005-0.0035. 40B steel plate is used to manufacture parts with larger section and higher performance requirements.

QSTE380TM material is a cold-formed hot-rolled pickled automotive structural steel.chemical compositionC: ≤0.12, Si: ≤0.35, Mn: ≤1.40, P: ≤0.03, S: ≤0.025, Alt: ≥0.01Mechanical propertiesYield strength MPa: ≥380Tensile strength MPa: 450-590Elongation: ≥23

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