SCM440

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JFS Steel's SCM440 and Steel Machining Service

Ju Feng Special Steel Co., Ltd. is an industrial steel materials, steel parts and steel-related services supplier from Taiwan. Along with steel bars, steel plates and steel tubes supply, steel cutting, drilling, machining and heat treatment services are also provided.

JFS Steel has been offering customers SCM440 Alloy Steel and precision steel machining services since 2006. With both highly skilled technology and 47 years experience, JFS Steel always makes sure to meet each customer's demand.


SCM440

Alloy Steel

SCM440 is medium carbon chromium molybdenum alloy steel, which is an alloy steel containing chromium and molybdenum. It has the advantages of stable composition, low harmful elements, high steel purity, small decarburization layer and few surface defects. It is easy to be spheroidized and has low cold cracking rate. It is usually hardened and tempered. The ultimate tensile strength is 850-1000 Mpa. This material achieves a very good balance between strength, toughness and wear resistance. The chromium content of the alloy provides good hardness permeability, and the molybdenum element imparts average hardness and high strength.

SCM440 reacts well in heat treatment and it is easy to process under heat treatment conditions. This material provides many desirable properties such as good strength and wear resistance, excellent toughness, good ductility and resistance to high-temperature stresses.

Chrome alloy structure steel

Purpose

SCM440 are widely used in high toughness alloy structural steel.

Product Features:

1. High strength and toughness.
2. Great property of quenching and can be deep hardened.
3. Less tempering brittleness tendency.
4. Great machining performance under high temperature and nice appearance after machining.
5. Good performance in weld ability.
6. Excellent performance in impact absorption, such as where the hammer may bounce back and has barely any damage caused upon impact.

International Comparison of Meterials

EU
EN
INTER
ISO
USA
AISI 
JAPAN
JIS
GERMANY
DIN
CHINA
GB
FRANCE
AFNOR
42CrMoS4
42CrMo4
42CrMo44140
4142
SCM44042CrMo442CrMo42CD4
42CD4u

ITALY
UNI
SPAIN
UNE
Sweden
SS
Finland
SFS
Russia
GOST
England
BS
42CrMo440CrMo41
40CrMo4
F1252
224442CrMo435KHM
38KHM
708M40
CFS11

**This comparison table is for reference only. The standards and grades of various countries have slightly different chemical compositions. Please refer to the database for details.**

Chemical Composition(JIS G4051)

碳(C)%矽(Si)%錳(Mn)%磷(P)%硫(S)%鉻(Cr)%鉬(Mo)%鎳(Ni)%銅(Cu)%
0.38-0.430.15-0.350.6-0.850≦0.030≦0.030.9-1.20.15-0.30≦0.250≦0.3

Conditions of heat treatment

  • Annealing: 830℃ Furnace Cooling
  • Normalization: 830~880℃ Air Cooling
  • Hardening: 830~880℃ Oil Cooling
  • Tempering: 530~630℃ Rapid Cooling

Criterion for heat treating conditions revise:

  • Ac: 750~790℃
  • Ar: 740~690℃
  • Ms: 310℃

Mechanical properties

Tensile strength (kgf/mm²): ≧100
Yield strength (kgf/mm²): ≧85
Elongation (%): ≧12
Cross section reduction rate (%): ≧45
Impact value (J/cm2): ≧6
Hardness (Hb) : 285~352

Size Range

ShapeSize(mm)
Round Bar131415161718192021222425
262830323436384042444546
48505560657075859095100105
110115120130135140145150160170180190
200210220230240250260270280290300315
325335345355365375385395405415425435
445455465475485495505515525535545555
565575585595605