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A low-carbon alloy steel, SCM 420, is a member of the family of chromium-molybdenum steels. Its exceptional strength, hardness, and wear resistance make it a popular choice for various applications due to its remarkable properties. As a result of its excellent mechanical properties and heat treatment capabilities, SCM 420 offers superior performance and reliability in demanding conditions.
“SCM 420” stands for “Structural Carbon Steel with Molybdenum.” Molybdenum is added to structural carbon steel as a metal alloying element to increase the strength and toughness of the material. As you can see, the carbon content of SCM 420 is relatively low, typically ranging from 0.18% to 0.23%. Due to the low carbon content of the steel, it is not only weldable and easy to fabricate but also solid and hardenable.
Because of its high hardenability, SCM 420 can be effectively hardened by heat treatment processes such as quenching and tempering due to its high hardenability. Manufacturers can achieve desired hardness levels and mechanical properties by adjusting the hardness levels and mechanical properties based on the application’s specific requirements. As a result of proper heat treatment, SCM 420 exhibits excellent strength, toughness, and wear resistance, making it ideal for applications involving heavy loads, impact, and abrasion, and the material is also corrosion-resistant.
Adding chromium improves the corrosion resistance and wear resistance of SCM 420. It is known that chromium forms a protective oxide layer on the steel surface that prevents it from reacting with the environment and reduces the risk of corrosion. Because SCM 420 has this unique feature, it is particularly suitable for applications involving moisture, chemicals, or corrosive elements.
SCM 420 alloy steel is used in a variety of industries. In automotive applications, gears, shafts, and other components related to transmissions and drivetrain systems are commonly manufactured with SCM 420 alloy steel. The material’s strength and wear resistance ensures reliable performance when subjected to high torques and heavy loads. As part of the oil and gas industry, SCM 420 is also used to manufacture drill collars and mud motors.
As well as being used in the automotive and oil and gas industries, SCM 420 is also used in the machinery and tooling industries. For heavy machinery to function correctly, gears, crankshafts, and other critical components must be durable and resistant to wear and tear. In addition to its excellent hardness and wear resistance, SCM 420 is frequently used in manufacturing cutting tools, dies, and molds due to its excellent properties.
SCM 420 alloy steel generally has excellent mechanical properties and can withstand the heat treatment. As a result of its strength, toughness, wear resistance, and corrosion resistance, it is one of the most valuable materials for a wide range of automotive, oil and gas, machinery, and tooling applications. Whether handling heavy loads, resisting wear, or ensuring reliable performance in challenging environments, the SCM 420 delivers outstanding performance and durability.
An SCM420 alloy steel has high hardenability, temper brittleness, good weldability, a low cold cracking tendency, good machinability, and a high cold plastic strain. In general, SCM420 is used for parts that require high wear resistance, such as gears, shafts, high-pressure pipes, and fasteners. Structural steel is carburized.
Addition To Other Grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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Scm420 Alloy Steel Round Bar Specification
SCM420 Alloy Steel Round Bar
Scm420 Chemical Composition
Mechanical Properties Of Aisi Alloy Scm420
|Tensile strength||517 MPa|
|Yield strength||365 MPa|
|Bulk modulus (typical for steel)||140 GPa|
|Shear modulus (specific for steel)||80.0 GPa|
|Elastic modulus||190-210 GPa|
|Elongation at break (in 50 mm)||33.00%|
|Reduction of area||63.70%|
|Hardness, Knoop (converted from Brinell hardness)||156|
|Hardness, Rockwell B (converted from Brinell hardness)||75|
|Hardness, Vickers (converted from Brinell hardness)||143|
|Machinability (hot rolled and cold drawn, based on 100 machinabilities for AISI 1212 steel)||60|
Products And Size Range
160mm x 160mm,
200mm x 200mm,
240mm x 280mm / 160mm, 200mm, 220mm (Rounds)
5.5 to 34 mm
20 mm to 160 mm Rounds,
23.5 mm to 48 mm A/F Hex
75 mm to 182 mm (Round Corner Squares)
As rolled, Soft Annealed
Spheroidised Annealed Normalized
As rolled, Annealed, Spheroidised Annealed, Normalized,
Machine straightened, Hardened, and tempered
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Thermal conductivity [W/m.K]: 20.0
Forging of ASTM Grade 4118 Steel
Hot forming temperature: 1100-850oC.
Conditions Of Heat Treatment
Annealing: 850℃ Furnace Cooling
Normalization: 850~900℃ Air Cooling
Hardening: 850~900℃ 1st Oil Cooling, 800~850℃ 2rd Oil Cooling
Tempering: 150~200℃ Air Cooling
Criterion For Heat Treating Conditions Revise:
GB 20CrMo, JIS SCM420, ASTM 4118, DIN 25CrMo4.
Tensile strength (kg/mm²): ≧95
Elongation (%): ≧14
Cross-section reduction rate (%): ≧40
Impact value (J/cm2): ≧6
Hardness (Hb): 352~362
850~900℃ 1st Oil Cooling, 800~850℃ 2nd Oil Cooling.
150~200℃ Air Cooling.
Thermal conductivity [W/m.K]: 20.0
Hot forming temperature: 1100-850℃
After the final cold drawing, t stress relief heat treatment is in a controlled atmosphere.
850~900℃ Air Cooling
850℃ Furnace Cooling
Density [g/cm3]: 7.85
Machinability (hot rolled and cold drawn, based on 100 machinabilities for AISI 1212 steel)
The weldability of AISI 4118 steel is also excellent, with excellent machining or cutting properties.
Scm420 Alloy Steel Round Bar Application
- Oil and gas pipeline
- Chemical industry
- Oil & Gas Industry
- Water supply systems
- Paper & Pulp Industry
- Power plant
- Fabrication industry
- Food processing industry
- Structural pipe
- Heat exchangers