Economical JIS G4105 SCM440 SCM420 Steel Pipes
We are leading manufacturer and stockiest of SCM440 SCM420 STEEL PIPES in China.
SCM440 is a Chrome alloy structure steel. It contains 0.9-1.2% Cr, usual use in gears, pump shafts and tool holders. The standard Hardness is 18-22HRc.
Chemical composition of SCM440 SCM420 STEEL PIPES
JIS SCM440 is commonly used in oil and gas sector. Typical applications as Connecting rod, Pin seam jacketed conveyor, gears, stem assembly, pump shaft and the tool holder.
At 1200°C start forging, keep the forging temperature no below 850°C
Heat to 850°C slowly, ensure heat thoroughly. Then cool in the furnace.
SCM440 steel usually supply at 18-22HRc, if need Hardening. Heat SCM440 to 840-870°C, then quench in oil until to room temperature.
Heat SCM440 steel to suitable Tempering temperature, Tempering temperature between 250-375°C.
According different use requirement, SCM440 heat treatment is different. We advice you contact your heat treatment supplier get more details data.
●Density of SCM440: 7.85 kg/cm3
●Thermal expansion co-efficient: 12.2 µm/m°C at 0-100°C
●Thermal conductivity: 42.6 W/mK @100°C.
●Tensile: 100-130 KSI
●0.2% Proof stress: 80-110 KSI
●Reduction of Area: 40% Min
●hardness: 18-22HRc / 217-235 HBS
*All test at room temperature 25°C and heat treatment SCM440 steel to 18-22HRc.
Quality Assured and Certification:
All SCM440 Steel quality by our ISO 9001:2008 quality management system. Material MTC Certification fllow to order delivery to Customers.
GB 42CrMoA, JIS SCM440, ASTM 4140, 4142, DIN 42CrMo4, 42CrMoS4. SCM440 are commonly used for the fasten parts with high strength, such as engine, die, motor, gear, transmission parts, shaft, gear, arm, cold forging parts, screw, and so on. SCM440 have the advantages of the stable composition, less harmful elements, high purity, less decarburization layer, less surface defects, easy spheroidized annealing, low cold heading cracking rate, steady heat treating quality, and uniform hardness.
SCM440 SCM420 STEEL PIPES materials are alloy steel with high harden ability, temper brittleness, well weld ability, less cold cracking tendency, good machinability, and great cold plastic strain. SCM420 generally are used for the parts which need high wear resistance, such as gears, shafts, high-pressure pipes, all kinds of fasteners, and so on.
Type of SCM440 SCM420 STEEL PIPES
SCM440 , 42CrMoA , SCM440 , 4140 , 4142 , 42CrMo4 , 42CrMoS4.
Applications of SCM440 SCM420 STEEL PIPES
SCM440 are widely used in high toughness alloy structural steel. SCM420 is widely used in general structural steel.
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.
Conditions of heat treatment
●Annealing: 830℃ Furnace Cooling
●Normalization: 830~880℃ Air Cooling
●Hardening: 830~880℃ Oil Cooling
●Tempering: 530~630℃ Rapid Cooling
●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:
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
Tensile strength (kgf/mm²): ≧95
Elongation (%): ≧14
Cross section reduction rate (%): ≧40
Impact value (J/cm2): ≧6
Hardness (Hb) : 352~362
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Types of SCM440 SCM420 STEEL PIPES
40Cr steel pipes tubes
Economical SCM440 STEEL tubes
42CrMo | AISI4140 Alloy Steel Round Bar
JIS F 0014:2000 Glossary of terms for shipbuilding (hull part -piping)
JIS F 0301:1990 Schemes of thermal insulation of piping for small ships
JIS F 0414:1996 Shipbuilding - internal wiring and piping of engine control console
JIS F 0506:1996 Shipbuilding - applications of copper pipes
JIS F 0507:1992 Small ships - steel pipes - application
JIS F 2007:1976 Mooring pipes
JIS F 2030:1978 Single point mooring pipes
JIS F 3993:1996 Discharge pipes for dredger
JIS F 3994:1996 Floaters of discharge pipes for dredger
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JIS G 3448:2004 Light gauge stainless steel tubes for ordinary piping
JIS G 3451:1987 Fittings of coated steel pipes for water service
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JIS F 7008:1996 Standard specification of thermal insulation for piping
JIS F 7101:1993 Pipes of ship's machinery - standard velocity of flow
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