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.