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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