Grade EQ70
Classification Alloy Steel
Properties Weldability
EQ70 Chemical Element Composition Content (%)
  Component C Si Mn P S Cr Ni Cu Mo N Ti V Nb B Al Ca More
TM Minimum Value - - 1 - - - - - - - - - - - 0.02 - Nb+V+Ti≤0.26*;Mo+Cr≤0.65*
Maximum Value 0.14 0.6 1.7 0.02 0.01 0.5 3.5 0.55 0.5 0.025 0.05 0.12 0.05 0.005 - 0.005
  Component C Si Mn P S Cr Ni Cu Mo N Ti V Nb B Al Ca More
QT Minimum Value - - - - - - - - - - - - - - 0.018 -  
Maximum Value 0.18 0.8 1.7 0.02 0.01 2 3.5 0.5 0.7 0.015 0.05 0.12 0.06 0.005 - 0.005
EQ70 Mechanical Properties
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Impact Energy Absorption
KV2
J
770~940 ≥690 ≥14 -40°C:
Longitudinal ≥69
Transverse ≥46

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