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Chemical composition
Standard Steel Chemical Composition
C Si Mn S P
    DIN2391              ST35 ≤0.17 ≤0.35 ≥0.40 ≤0.025 ≤0.025
ST37 ≤0.17 ≤0.35 ≥0.40 ≤0.025 ≤0.025
ST37.4 ≤0.17 ≤0.35 ≥0.40 ≤0.025 ≤0.025
ST45 ≤0.21 ≤0.35 ≥0.40 ≤0.025 ≤0.025
ST44 ≤0.21 ≤0.35 ≥0.40 ≤0.025 ≤0.025
ST52 ≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.025
EN 10305 E235 ≤0.17 ≤0.35 ≤1.20 ≤0.025 ≤0.025
E255 ≤0.21 ≤0.35 0.40-1.10 ≤0.025 ≤0.025
E355 ≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.025
   GB/T3639    10# 0.07-0.13 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035
20# 0.17-0.23 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035
Q345 ≤0.20 ≤0.55 1.00-1.60 ≤0.035 ≤0.035
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