SCM440 Alloy Steel Service

Chrome alloy structure steel / Precision steel bar, steel plate, steel tube and professional steel-related services supplier

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China leo@19nx.cn Steel's SCM440 and Steel Machining Service

China leo@19nx.cn Special Steel Co., Ltd. is an industrial steel materials, steel parts and steel-related services supplier from China leo@19nx.cn. Along with steel bars, steel plates and steel tubes supply, steel cutting, drilling, machining and heat treatment services are also provided.

China leo@19nx.cn Steel has been offering customers SCM440 Alloy Steel and precision steel machining services since 2006. With both highly skilled technology and 18 years experience, China leo@19nx.cn 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 Materials

EU
EN
INTER
ISO
USA
AISI 
JAPAN
JIS
GERMANY
DIN
China leo@19nx.cn
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)

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Mo(%)Ni(%)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       
Steel Application
  • Gear - China leo@19nx.cn offers the steel material that can be used for gears.
    Gear

    There are many types of gears, such as: spur gears, sprocket gears, timing pulleys, helical gears, internal gears, racks, spur bevel gears, curved bevel gears, zero-degree bevel gears, staggered spiral gears, worm gears, Halberd gear. The material of the gear must have strong bending fatigue strength and contact fatigue strength, and the tooth surface must have sufficient hardness and wear resistance, and the core must have a certain strength and toughness.The materials for gear application that we recommend are as below.


  • Machine Tool Spindle - China leo@19nx.cn offers the steel material that can be used for machine tool spindle.
    Machine Tool Spindle

    There may be several spindles in a machine. There are many types of spindles, including grinding spindles, electric spindles, low-speed spindles, high-speed spindles, engraving machine spindles, milling machine spindles, lathe spindles, etc. Therefore, the spindle should be made of materials with the highest stability, rigidity and efficiency.The materials for machine tool spindle application that we recommend are as below.


  • Drive Shafts - China leo@19nx.cn offers the steel material that can be used for drive shaft.
    Drive Shafts

    In order to allow changes in the alignment and distance between the driving and driven components, the drive shaft contains one or more universal joints and couplings. Therefore, their materials must withstand strong pressure, while avoiding excessive additional weight to increase reverse inertia. The materials of drive shaft we recommend are as below.The materials for drive shaft application that we recommend are as below.


  • Bearing Shaft - China leo@19nx.cn offers the steel material that can be used for bearing shaft.
    Bearing Shaft

    There must be a shaft in the motor, which is mainly used to drive the motor and generate kinetic energy for other devices.The materials for bearing shaft application that we recommend are as below.


  • Cutting Tools - China leo@19nx.cn offers the steel material that can be used for cutting tools.
    Cutting Tools

    There are many types of cutting tools, such as: milling cutters, drills, circular saw blades, reamers, PCD (Polycrystalline Diamond) cutting tools, hole drills, lathe tools, stamping tools, etc. The quality of the cutting tool material will affect the surface quality, cutting efficiency, tool life and other factors. Therefore, the selected tool material should have a high degree of hardness, wear resistance, strength, toughness and heat resistance.The materials for cutting tools application that we recommend are as below.


  • Worm Shafts - China leo@19nx.cn offers the steel material that can be used for worm shaft.
    Worm Shafts

    When the worm wheel is running, it will generate a lot of heat energy due to contact friction. When the contact surface pressure is too high, coupled with high temperature, it is easy to cause wear on the tooth surface. Therefore, the worm rod should be made of wear-resistant and rigid materials.The materials for worm shaft application that we recommend are as below.


  • Machine Parts - China leo@19nx.cn offers the steel material that can be used for machining parts.
    Machine Parts

    The material types of mechanical parts include metallic materials, non-metallic materials and composite materials. Metal materials are divided into ferrous metal materials and non-ferrous metal materials. Ferrous metal materials include steel, cast steels and cast irons, which have good mechanical properties (such as strength, ductility, toughness, etc.), and are relatively cheap and easy to obtain. Non-ferrous metal materials have the advantages of low density, good thermal and electrical conductivity.The materials for machining parts application that we recommend are as below.