PLATES steel, low alloy high strength steel, after heat treatment, good mechanical properties, high strength, adequate toughness, hardenability, weldability, and processing are good, but the low corrosion resistance and oxidation resistance. low-temperature tempering or austempering. 

 The PLATES steel hardenability, good material, After appropriate heat treatment can be obtained strength, hardness, toughness and fatigue strength of good mechanical properties, can adapt to the more complicated working conditions in coal production. 

 Chemical composition: 
 Carbon C: 0.32 ~ 0.39 PLATES alloy structural steel 
 Silicon Si: 1.10 ~ 1.40 
 Mn Mn: 0.80 ~ 1.10 
 Sulfur S: Allow the residual content of ≤ 0.025 
 Phosphorus P: Allow the residual content of ≤ 0.025 
 Chromium Cr: 1.10 ~ 1.40 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.025 

 Mechanical properties: 

 Tensile strength σb (MPa): ≥ 1620 (165) 
 Yield strength σs (MPa): ≥ 1275 (130) 
 Elongation δ5 (%): ≥ 9 
 Reduction of area ψ (%): ≥ 40 
 Impact energy Akv (J): ≥ 31 
 The impact toughness αkv (J/cm2): ≥ 39 (4) 
 Hardness: ≤ 241HB