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SCM440 Forged Alloy Steel
 SCM440 is a kind of steel commonly used in the production of high strength fasteners. The product has the advantages of stable composition, low harmful elements, high purity of steel, small decarburization layer, few surface defects and so on. It is easy to make spidizing annealing, low cold heading cracking rate, stable heat treatment quality and uniform hardness, and is widely used in engine, mold and other industries.

Material Name: Alloy Structural Steel

Brand number: SCM440(Japanese brand, see standard JIS G4053-2008

 

Application:

It belongs to medium hardenability steel. After heat treatment, it has good strength, good comprehensive mechanical properties, good technability and high yield of finished products.The highest operating temperature is 427℃.Can be used as steam turbine fasteners.

Characteristics and application

1.Good quenching property, can be deep quenching, rather than the market anti-saw lock surface quenching

2.Less tendency to temper brittleness

3.Good high temperature processing, beautiful after processing

4.Good welding

5.The absorption performance of the impact is good, the hammer hit it will have a sense of rebound, unable to carry out violent destruction advantages:

(1) Good processability

(2). Good shock absorption performance

(3). Welding is easy

Chemical Composition

C: 0.38 to 0.43

Si: 0.15 to 0.35

Mn: 0.60 to 0.85

P: 0.03 or less

S: 0.03 or less

Cu: 0.30 or less

Ni: 0.25 or less

Cr: 0.90 to 1.20

Mo: 0.15 to 0.30

Ni: 0.25 or less

Cu: 0.30 or less

 

Mechanical Properties of SCM440:

Tensile strength σb (MPa) : ≥1080(110) Yield strength σs (MPa) : ≥930(95)

Elongation Δ5 (%) : ≥12

Section shrinkage ψ(%) : ≥45

Impact work AKV (J) : ≥63

Impact toughness value α kV (J/ Cm&SUP 2;)A: 78 (8) or

Hardness: 217 HB or less