Gear Steel And Bearing Steel

JIS G4051 SNCM220 Steel Bar

JIS G4051 SNCM220 Steel Bar
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Product Details

SNCM 220 is a commonly used alloy for gear and bear application. After carburizing, the steel has relatively high hardness, abrasion resistance and contact fatigue strength, while the core still retains good toughness and can withstand high impact load. SNCM220 is mainly used for railway bearing and other impact and wear resistant parts.

 

Standards: JIS G4051

Type: Round bar

Size: 13-190 mm

Finish: Peeled, Hot Rolled, Turned and Polished, Centreless Ground.

 

 

The Equivalent Standards:

JIS

AISI

GB

ГOCT

DIN

ISO

JIS   G4051

8615
  8617
  8620

20CrNiMo

20XH2M

20NiCrMo2-2

20NiCrMo2
  20NiCrMoS2

 

The Chemical Composition

C

Si

Mn

Ni

Cr

Mo

P

S

0.17-0.23

0.15-0.35

0.6-0.9

1.6-2.0

0.40-0.7

0.15-0.3

≦0.03

≦0.03

 

The Mechanical Properties

Tensile   Strength (kgf/mm²)

Yield   Strength 0.2% (MPa)

Elongation   -% in 50 mm (min.)

Hardness,   HB

≥85

≥100

17

≤341

 

 

Heat treatment:

Annealing: 850℃ furnace cold

Normalization: air cooling at room temperature of 850~900℃

Quenching: 850~880℃ first oil cooling, 800~850℃ second oil cooling

Tempering: air cooling at room temperature of 150~200℃

 

Applications:

SNCM220 steel rod is generally used in the condition of quenching and tempering or carburizing. It is used to manufacture high-pressure pipe and various fasteners and advanced carburizing parts, such as gears and shafts, which work in the working temperature below 250℃ and in the non-corrosive environment, such as medium containing nitrogen and hydrogen mixture.

 

World iron&steel is a professional supplier of alloy steel rods and bars. We manufacture and distribute high quality SNCM220 Gear steel round bar in accordance with JIS G4051 standards, specified delivery conditions and final customer specifications for industrial and commercial applications. Special sizes of steel bars and delivery issues can be further negotiated and we provide a wide range of solutions for purchasing departments to select alternative grades, contact us today!

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