32CrMo12 | 31CrMo12 | DIN 1.7361

32CrMo12 steel is a nitriding steel which has at least 2.8Cr%,0.3%Mo as strengthening elements as per EN10250 standard.Similar with 30CrMo12,31CrMo12, it has a high tensile strength 880 – 1230 MPa after QT.32CrMo12 has high surface hardness and wear resistance after nitrided,but this material is difficult to weld and should therefore not be used in welded constructions.

32CrMo12 Steel Supply Form & Size & Tolerance

Hot rolled round bar:Φ20-Φ120mm,Length:3000-9000mm

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface Finish	Black-Forged	Black-Rolled	Turned	Grinding	Polished	Peeled	Cold Drawn
Tolerance	(0，+5mm)	(0，+1mm)	(0，+3mm)	Best h9	Best h11	Best H11	Best H11

32CrMo12 Steel Chemical Composition

Grade	C	Si	Mn	P	S	Cr	Ni	Mo
32CrMo12/1.7361	0.28-0.35	≤ 0.4	0.40-0.70	≤ 0.035	≤ 0.035	2.8-3.3	≤ 0.6	0.3-0.5

32CrMo12 Steel Relevant Standards

Europe	France	UK	Sweden
31CrMo12/1.8515	30CD12	722M24	2240

32CrMo12 Steel Mechanical Property

Thickness of ruling section T,mm		≤160	160-330	≥330
Yield Strength Mpa		≥680	≥630	≥490
Tensile Strength Mpa		≥900	≥850	≥700
Elongation, %	longitudinal	≥12	≥13	≥15
Elongation, %	transverse	≥8	≥9	≥11
Impact,J	longitudinal	≥35	≥35	≥35
Impact,J	transverse	≥20	≥20	≥20

32CrMo12 Steel Physical Property

Density: 7.8 g/cm3
Mean coefficient of expansion in m/m.°C:
– between 20 °C and 100 °C:11.3 x 10-6
– between 20 °C and 500 °C:13.6 x 10-6
Critical points:
– Ac 1: 780 °C
– Ac 3: 835 °C
Modulus of elasticity ：210GMpa

32CrMo12 Steel Forging

32CrMo12 steel forging temperature:900 – 1100°C ,cooling as slowly as possible in sand after forged.

32CrMo12 Steel Heat Treatment

Normalizing: 880 – 920°C,Cooling in air
Soft Annealing:650 – 700°C,Cooling in furnace,Hardness:max 248 HB
Hardening:890 – 940°C,water or oil quench
Tempering:550 – 740°C,Cooling in air
Nitriding: 480-570°C. Hardness after nitridng is 480-570 HV1.

32CrMo12 Steel Application

32CrMo12 is used in automotive and general mechanical engineering components which requires high hardness and wear resistance,also suitable for gear wheels, cylinders, drills, connecting rods, shafts, extruders, quides, thread gauges with relatively large-cross section.