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The Main JIS Standard Alloy Steel Material For Structure

Shannxi Shew-E Steel Pipe Co.,Ltd | Updated: Dec 13, 2018

Alloy steel is iron based with alloying elements added, commonly adding elements including: Nickel, Chromium, Molybdenum, Zirconium, Vanadium, Cobalt, Aluminum, Silicon, Manganese, Tungsten, Titanium and so on. These alloying elements change the mechanical properties and physical properties of carbon steel, can obtain high strength and toughness, better wear resistance, corrosion resistance, low temperature resistance and high temperature resistance.

The main advantage of structural alloy steels for mechanical manufacturing is that they are easy to quench and their mechanical properties are significantly improved after tempering. Not only has good mechanical properties such as tensile strength, elastic limit, elongation, impact value, fatigue limit. In addition, It have excellent workability such as casting, forging and machinability, can be used in the manufacture of all kinds of mechanical parts such as axle, gear, screws, nuts, automobile, motorcycle parts, machinery parts, and wear-resistant parts surface carburizing and hardening application. The most commonly used in JIS standard alloy structural steel mainly including:


  • SCM415 alloy steel

The corresponding standards of SCM415 are GB 15CrMo and DIN 15CrMo5. Carburized and hardened SCM415 alloy steel is intended for use with cylinders, pistons, spindles, gears, bolts, shafts, etc. where require high toughness or wear resistance.

The replaceable materials of SCM420 are GB 20CrMo, ASTM 4118 and DIN 25CrMo4. SCM420 alloy structural steel has high hardenability, good weldability, good machinability and cold strain plasticity, without tempering brittleness and not easy to form cold crack. It is used for manufacturing various special wear-resisting parts of automobile and aircraft, such as gears, shafts, high-pressure pipes and various fasteners.

  • SCM440 alloy steel

SCM440 is a kind of medium carbon-chromium-molybdenum alloy steel. The chromium content provides good hardness permeability, and the molybdenum element gives hardness uniformity and high strength. The alloy balanced the strength, toughness and wear resistance well. It has the following advantages: stable composition, low harmful elements, high steel purity, small decarbonization layer, less surface defects, etc., and is easy to process under heat treatment conditions, with good ductility and resistance to high temperature stress. This material is widely used in the production of high strength steel fasteners, such as engine, mold, motor, gear, transmission parts, shaft, gear, arm, cold forging parts, screw products.

  • SNCM220 alloy steel

SNCM220’s corresponding steel material is GB 20CrNiMo, ASTM 8615, 8617, 8620, 8622, DIN 20MoCr4. SNCM220 is a commonly used alloy carburized steel and bearing steel, carburized surface has a fairly high hardness, wear resistance and contact fatigue strength, while the centre still retains good toughness and can withstand high impact pressure. SNCM220 is mainly used as the material of impact and wear resistant parts of automobile bearings, transmission shafts, gears, screws, tool parts, etc.

  • SNCM420 alloy steel

The alloy steel JIS SNCM420 can be replaced by ASTM 4320. SNCM420 is also a carburized steel. Its mechanical properties are similar as SNCM220, both has relatively high hardness, abrasion resistance and contact fatigue strength after carburizing on the surface. SNCM420 is mainly used as railway bearing, transmission shaft, gear, screw, tool parts and other parts that can withstand impact and wear.

  • SNCM439 alloy steel

The corresponding material of SNCM439 are GB 40CrNiMoA, 45CrNiMoVA, ASTM 4340, 9840. SNCM439 is a kind of tempered steel with high hardness and toughness. It is suitable for manufacturing screws, gears, shafts, nuts, pistons or parts that need toughness for motor vehicles.

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