Is carbon steel 20#? Carbon steel means that alloy elements are not specially added into the steel, which is divided into ordinary carbon structural steel and high-quality carbon structural steel. The grades of ordinary carbon structural steel are Q195, Q215, Q235 and Q275. The grades of high quality carbon structural steels are: 10#, 20#, 45#, 15Mn, 20Mn, 25Mn, 30Mn, 35Mn, 40Mn, 45Mn, 65Mn, etc. It can be seen that A572 grade 60 ms steel coil, 20# steel is carbon steel, but carbon steel means more than 20# steel.
Cold formed hot rolled automotive structural steel QSTE420TM plate Material/brand: QSTE420TM Executive standard: Q/BQB 310 Chemical composition (melting analysis)% Carbon: ≤0.12, Silicon: ≤0.35, Manganese: ≤1.50, Phosphorus: ≤0.05, S: ≤0.025, Titanium: ≤0.22, Niobium: ≤0.09, Aluminum: ≥0.01 Mechanical properties Yield strength MPa: ≥420 Tensile strength MPa: 480-620 Elongation: ≥21
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