China · GB

ML30

GB/T 6478:2001 — Steels for cold heading and cold extruding

Chemical composition

wt% · log scale
0.010.11C0.27 – 0.34Cr0.2Cu0.2Mn0.3 – 0.6Ni0.2P0.035S0.035Si0.2
  • min – max range
  • typical value

Mechanical properties

value range by condition
Yield strength Rp0.2≤295 MPaTensile strength Rm≤490 MPaElongation A≤21 %Reduction of area Z≤50 %steel bars, wire, Heat treatedHardness线材  Heat treatedsteel bars, HB

Chemical composition

ElementminmaxSimilarRemarks
C0.270.34
Cr0.2
Cu0.2
Mn0.30.6
Ni0.2
P0.035
S0.035
Si0.2

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
steel bars, wire, Heat treated≤295≤490≤21≤50
steel bars, HB线材  Heat treated 179

Heat treatment

Type34
Heat-treatment processNormalizedAC3+30℃~50℃