20MNCR5

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

China/GB 3077 USA/ASTM A29 Japan/JIS G4053 France/AFNOR NF A 35-551 Germany/DIN 17210
20CrMn 5120 SMnC420 20MC5 20MnCr5

Addition to other grades

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTMSA-105, SAE1018, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.

Our Supply Range

We supply to automotive ancillaries and OEM customers. The products we manufacture are used as input for manufacturing of automotive and general engineering components. These components are further assembled into systems fitted in automobiles and other engineering applications.

Product Type Size Range
Forged Round Bars 140mm Dia and above
Rolled Round Bars 12mm Dia and above
Forged Flat Bars Thickness: 32mm to 510mm, Width: 65mm to 1050mm
Rolled Flat Bars Thickness: 6mm to 110mm, Width: 25mm to 810mm

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

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.

Hardness

150-250HB

Hardening

Hardening °C – 780-820

Thermal Properties

46.6

Forging Properties

Hot Forming temperature: 1100-850 °C.

Stress Relieving

Stress-relief annealing °C – 550-600

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

Physical Properties

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

Tempering

Tempering °C – at least twice 150-200

Normalizing

850-880 °C, air cool

Annealing

Heat to 650-700 oC.

Density

Density (×1000 kg/m3)
7.7-8.03
25

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.

Supply Cities

Ambattur, Bangalore, Chennai, Coimbatore, Chengalpattu, Dindigul, Guindy, Nellore, Hyderabad, Hosur, Tiruvallur, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukkottai, Nagapattinam.

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