20MNCR5

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Grade Introduction:

20MnCr5 steel is a low alloyed engineering case hardening steel for parts that require core tensile strength of 1000 – 1300 N/mm² and good wearing resistance.

This steel is carburizing steel used for components requiring high wear resistance surface, coupled with tough cores to resist shock loads and strength to give large service life.

Grade Application:

20MnCr5|1.7147 gearing steel is widely used for a variety of applications in the used to the gearings in rotating machinery. Typical applications such as valve bodies, pumps, and fittings, the high load of the wheel, bolts, double-headed bolts, gears, internal combustion engine. Electric locomotives, machine tools, tractors, steel rolling equipment, boring machine, railway vehicle, and mining machinery transmission shaft on the steel ball, roller and shaft sleeve, etc.

Equivalent grades: 

ASTM A29/A29M DIN EN 10083/3 JIS G4053 DIN DIN/T DIN17210

Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.

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Chemical composition:

The following table shows the chemical composition of 20MNCR5 steel:

Element	C	Si	Mn	P	S	Cr
Content (%)	0.17～0.22	≤0.40	1.10～1.40	≤0.035	≤0.035	1.00～1.30

Mechanical Properties:

The mechanical properties of annealed DIN 20MnCr5/1.7131 gearing steel (typical for steel) are outlined in the table below:

Tensile	Yield	Bulk modulus	Shear modulus	Poisson’s ratio	Thermal conductivity
MPa	Mpa	Gpa	Gpa		W/mK
520	415 Min	140	80	0.27-0.30	46.6

Hardness:

 218

Heat treatment:

When hardening 20MnCr5 heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each steel component. Other considerations during heat treatment include the type of furnace, quenching medium and work piece transfer facilities. Please consult a heat treatment specialist for full guidance on heat treatment of 20MnCr5 steel.

Hardening:

Hardening °C – 780-820

Tempering:

Tempering °C – at least twice 150-200

Physical Properties:

Thermal Conductivity at °C	20	350	700
W/(m*K)	11.7	12.8	13.5

Thermal Properties:

46.6

Forging Properties:

Hot Forming temperature: 1100-850 °C.

Stress Reliving:

Stress-relief annealing °C – 550-600

Normalizing:

850-880 °C, air cool

Annealing:

Heat to 650-700 oC.

Density:

Density (×1000 kg/m3)

7.7-8.03

25

Machinability:

Welding:

20MnCr5 Steel is defined as Mn-Cr case hardening steel as per EN10084 Standard. Compared with 20MnCr5 has a little higher on Carbon, Manganese, and Chromium, both of them have good hardenability, machinability, and wear resistance, but poor in weldability.

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