16MnCr5 Steel | DIN 1.7131 Case Hardening Steel

16MnCr5/DIN 1.7131 steel is a typical low carbon alloy (chromium-manganese series) case hardening steel as per European standard EN10084.

As a surface-hardened engineering steel, 16MnCr5 steel has good hardenability and machinability. After heat treatment, it can obtain higher surface hardness, good wear resistance and low-temperature impact toughness.

16MnCr5 steel is mainly used to manufacture gears, worm gears, seal sleeves, bolts and other mechanical engineering parts after carburizing and quenching.

16MnCr5 STEEL CHEMICAL COMPOSITION

Grade	C	Si	Mn	P	S	Cr
16MnCr5/1.7131	0.14-0.19	≤ 0.4	1.0-1.3	≤ 0.025	≤ 0.035	0.8-1.1

16MnCr5 STEEL RELATED STANDARD & EQUIVALENT GRADE

CHINA:15CrMn

USA:5120

France:16MC5

UK:590M17

16MnCr5 STEEL PHYSICAL PROPERTY

Density, g/cm3	7.89
Melting point,℃	1445
Specific heat capacity，(0~100℃),J/(kg.k)	481
Linear expansion coefficient,10^-6/k	12.59
Poisson’s ratio	0.28
Elastic Modulus,Mpa	211000
Shear modulus,Mpa	82600
Thermal conductivity,W/(m.K)	41(101℃)

16MnCr5 STEEL FORGING

Initial Forging Temperature：1150℃
Final Forging Temperature：>800℃
Forging Ratio：above 4:1
Cooling Method After Forged:As low carbon alloy steel,16MnCr5 steel is generally treated by slow cooling in sands after forging.

16MnCr5 STEEL HEAT TREATMENT

Critical Temperature for Heat Treatment of 16MnCr5 Steel

Ac1:750℃
Ac3:845℃
Ms:400℃

Temperature Selection for Different Types of Heat treatment for 16MnCr5 steel

Normalizing: 880 – 900°C,Cooling in air
Annealing:860 – 900°C,Cooling in furnace,hardness below 179HBW
Carburizing:880-980°C
Core-hardening:860-900°C
Case-hardening:780-820°C
Tempering:150-200°C

16MnCr5 Steel Hardenability Limits

Jominy Quenching Test Curve For 16MnCr5 Steel

Quenching at 870°C

X:Distance from quenched end,in mm

Y:Hardness,HRC

1: HH level

2: HL level

3: H level

Distance from quenched end mm		1.5	3	5	7	9	11	13	15	20	25	30	35	40
16MnCr5+H	HRC Max	47	46	44	41	39	37	35	33	31	30	29	28	27
16MnCr5+H	HRC Min	39	36	31	28	24	21	–	–	–	–	–	–	–

16MnCr5 Steel Mechanical Property with Quenched and Tempered Condition

Quenching Temperature,ºC	Tempering Temperature,ºC	Tensile Strength Mpa	Yield Strength Mpa	Elongation %	Reduction of Area %	Impact Charpy-V J
880ºC, Oil Quench	200ºC	≥785	≥590	≥12	≥50	≥47