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34CrMo4-steel

34CrMo4 / 1.7220 Steel

34CrMo4 / 1.7220 steel is a heat treatable steel  which contains at least 0.9%Cr,0.15%Mo as strengthening elements which is similiar like Chinese grade 35CrMo.It has good repeated impact resistance,good fatigue properties in alternating bend stress,but poor in weldability,this steel grade can be welded only with suitable procedure.This material is generally used in the quenched and tempered condition.

34CrMo4 / 1.7220 Steel Supply Form & Size & Tolerance

  • Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm
  • Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm
  • Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm
Surface Finish Tolerance
Black For Forged condition (0,+5mm)
Black For Rolled condition (0,+1mm)
Rough Turned (0,+3mm)
Grinding Best h9
Polished Best h11
Peeled Best H11
Cold Drawn Best H11

34CrMo4 / 1.7220 Steel Chemical Composition per EN 10083-3

GRADE NUMBER C Si Mn P S Cr Mo
34CrMo4 1.7220 0.30-0.37 ≤ 0.40 0.60-0.90 ≤ 0.025 ≤ 0.035 0.90-1.20 0.15-0.30

 

34CrMo4 / 1.7220 Steel Relevant Standards

USA UK China France
4135/4137 708A37 35CrMo 34CD4

34CrMo4 / 1.7220 Steel Mechanical Property

Diameter d mm ≤ 16 16-40 40-100 100-160 160-250
Thickness t mm < 8 8-20 20-60 60-100 100-160
Yield Strength Mpa ≥800 ≥650 ≥550 ≥500 ≥450
Tensile Strength Mpa 1000-1200 900-1100 800-950 750-900 700-850
Elongation, % ≥11 ≥12 ≥14 ≥15 ≥15
Reduction of area ,% ≥45 ≥50 ≥55 ≥55 ≥60
impact,J ≥40 ≥45 ≥45 ≥45
Hardness,HB 298-359 271-331 240-286 225-271 213-253

 

34CrMo4 / 1.7220 Steel Forging

34CrMo4 forging temperature:900 – 1100°C

34CrMo4 / 1.7220 Steel Heat Treatment

  • Normalizing:  850 – 880°C,Cooling in air
  • Soft Annealing:650 – 680°C,Cooling in furnace,maximum hardness 223HB
  • Hardening:830 – 890°C,Quenching in oil or water
  • Tempering:540 – 680°C,Cooling in air

34CrMo4 / 1.7220 Steel Application

34CrMo4 heat treatable steel with a typical tensile strength of 800 – 1100N/mm². For automotive and aircraft components with high toughness as crankshafts, axles, axle journals, tyres,gears and any components subject to fatigue stresses.

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