Gear Steel And Bearing Steel

SCM440 Steel Bar

SCM440 Steel Bar
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Product Details

SCM440 is a type of medium-carbon Cr-Mo alloy steel specified in Japanese standards. Chromium provides good hardness permeability and Molybdenum gives hardness uniformity and high strength. The steel has good ductility and resistance to high-temperature stress, is characterized by structural stability, low harmful elements, small decarburization layer, fewer surface defects, etc.

SCM440 has better strength and good comprehensive mechanical properties after heat treatment, and is easier to process under heat treatment. It has excellent quenchability, can be deeply quenched and the temper brittleness tendency is less, widely used in the production of high strength steel fasteners such as engine, mold, motor, gear, transmission parts, shaft, arm, cold forging parts, screw, etc..

 

Standards: JIS G4051, JIS G4053

Size: φ15 - 200mm

Forms: Round bar

Delivery condition: Cold drawing, hot rolling, forging

 

The Equivalent Standards:

EN

ISO

AISI

DIN

GB

42CrMoS4
   42CrMo4

42CrMo4

4140

42CrMo4

42CrMo

 

Chemical composition

C

Si

Mn

Cr

Mo

Ni

P

S

0.38-0.43

0.15-0.35

0.6-0.85

0.9-1.2

0.15-0.3

≦0.25

≦0.03

≦0.03

 

The Mechanical Properties

Tensile     Strength (kgf/mm²)

Yield     Strength 0.2% (MPa)

Elongation   -% in 50 mm (min.)

Hardness,   HB

≥1080(110)

≥930(95)

17

285~352

 

Heat Treatment Condition

• Annealing: furnace cooling at 830℃

• Normalization: air cooling at room temperature of 830~880℃

• Quenching: 830~880℃ oil cooling

• Tempering: 530~630℃ rapid cooling

 

World iron&steel is a professional supplier of alloy steel rods and bars. We manufacture and distribute high quality SCM440 steel round bar for gear application in accordance with JIS G4053 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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