SNCM420 Alloy Steel Service

A nickel, chromium, molybdenum case hardening steel / Precision steel bar, steel plate, steel tube and professional steel-related services supplier

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China Steel's SNCM420 and Steel Machining Service

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

China Steel has been offering customers SNCM420 Alloy Steel and precision steel machining services since 2006. With both highly skilled technology and 18 years experience, China Steel always makes sure to meet each customer's demand.


Alloy Steel

Equivalent Grades: JIS SNCM420 and ASTM 4320. SNCM420 is mainly used for railway bearings, drive shafts, gears, screws, cutting tools and other products which need impact resistance and wear resistance.
SNCM420 is a kind of alloy carburizing steel as SNCM220. The mechanical properties between SNCM420 and SNCM220 are almost the same. The surface of SNCM420 is high hardness and has good performance in abrasion resistance and contact fatigue strength. Its core which has high toughness can withstand high impaction. There are two differences between SNCM420 and SNCM220 which are the standard and the amount of Ni content. The Ni content of SNCM420 is more than the one of SNCM220.

A nickel, chromium, molybdenum case hardening steel


SNCM420 is widely used in high toughness alloy structural steel.

International Comparison of Materials




**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)


Conditions of heat treatment

  • Hardening: 860~900℃ 1ST Oil Cooling, 780~820℃ 2RD Oil Cooling
  • Tempering: 150~200℃ Air Cooling

Mechanical properties

Tensile strength (kgf/mm²): ≧100
Elongation (%): ≧13
Cross section reduction rate (%): ≧45
Impact value (J/cm2): ≧8

Size Range

Round Bar13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 45, 46, 48, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 160, 170, 180, 190.
Steel Application
  • Gear - China offers the steel material that can be used for gears.

    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 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 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 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 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 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 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.