| Quantity: | |
|---|---|
| Category | Parameter | Value |
| Chemical Composition | Carbon (C) | 0.38–0.43 |
| Silicon (Si) | 0.15–0.35 | |
| Manganese (Mn) | 0.60–0.85 | |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.040 | |
| Chromium (Cr) | 0.90–1.20 | |
| Molybdenum (Mo) | 0.15–0.30 | |
| Nickel (Ni) | ≤0.25 | |
| Copper (Cu) | ≤0.30 | |
| Mechanical Properties | Tensile Strength | ≥100 kgf/mm² |
| Yield Strength | ≥85 kgf/mm² | |
| Elongation | ≥12% | |
| Reduction of Area | ≥45% | |
| Impact Value | ≥6 J/cm² | |
| Hardness | 285–352 Hb | |
| Heat Treatment | Normalizing Temperature | 850–900°C |
| Cooling Method (Normalizing) | Air Cooling | |
| Annealing Temperature | 850°C | |
| Cooling Method (Annealing) | Furnace Cooling | |
| Forging | Initial Forging Temperature | 1150°C |
| Final Forging Temperature | 850°C | |
| Forging Ratio | ≥4:1 | |
| Post-Forging Treatment | Slow Cooling in Sand |
1. Exceptional Corrosion Resistance: One of the most notable features of many alloy steels is their outstanding corrosion resistance. Steels alloyed with chromium, for example, form a thin, passive oxide layer on the surface that acts as a barrier against moisture, oxygen, and other corrosive agents. Stainless steel, a well - known type of alloy steel with a chromium content of at least 10.5%, is highly resistant to rust and staining, making it ideal for applications in the food and beverage industry, marine environments, and medical equipment. Other alloying elements like nickel and molybdenum can further enhance corrosion resistance, enabling the steel to withstand even more aggressive chemical environments.
2. High Strength and Toughness: Alloy steels are designed to offer significantly higher strength and toughness compared to carbon steel. By adding elements such as manganese, vanadium, and nickel, the steel's microstructure can be modified to increase its tensile strength, yield strength, and impact resistance. This makes alloy steel suitable for applications where components need to bear heavy loads, resist deformation, and absorb energy without fracturing. For instance, in the aerospace industry, alloy steels are used for critical components like landing gear, engine parts, and structural frames, where failure is not an option.
3. Heat Resistance: Many alloy steels are engineered to perform well at elevated temperatures. Elements like chromium, molybdenum, and tungsten form stable carbides and other compounds that prevent the steel from softening and losing its strength when exposed to high heat. This heat - resistant property makes alloy steel essential in applications such as power plant boilers, gas turbines, and automotive exhaust systems, where components are subjected to extreme thermal conditions.
4. Wear Resistance: Alloy steels can be formulated to have excellent wear resistance. By incorporating elements like chromium, vanadium, and tungsten, the steel can develop a hard and durable surface that resists abrasion, erosion, and galling. This is crucial in applications such as manufacturing cutting tools, gears, and bearings, where components are in constant contact with other surfaces and need to maintain their integrity over long periods of use.
1. Aerospace Industry: In the aerospace sector, alloy steel is used extensively due to its high strength - to - weight ratio, heat resistance, and corrosion resistance. Components such as landing gear, which need to support the weight of the aircraft during takeoff, landing, and taxiing, are made from high - strength alloy steels. Engine parts, including turbine blades and shafts, must withstand high temperatures and mechanical stresses, and alloy steels with heat - resistant properties are the materials of choice. The aerospace industry also relies on alloy steels for structural components to ensure the safety and reliability of aircraft in flight.
2. Oil and Gas Industry: The oil and gas industry operates in some of the harshest environments on earth, and alloy steel is essential for its equipment and infrastructure. Pipelines transporting oil and gas need to resist corrosion from the fluids they carry as well as the surrounding soil and water. Alloy steels with high corrosion resistance, such as those containing chromium and molybdenum, are used for pipeline construction. Drilling equipment, including drill bits, casings, and tubing, also requires alloy steels with high strength, wear resistance, and the ability to withstand high pressures and temperatures.
3. Medical Equipment Manufacturing: In the medical field, alloy steels like stainless steel are widely used for manufacturing surgical instruments, implants, and medical devices. The corrosion resistance of stainless steel ensures that the equipment remains hygienic and does not react with bodily fluids. Its strength and biocompatibility make it suitable for implants such as hip and knee replacements, where long - term reliability and compatibility with the human body are essential.
A: SCM440 is widely used in automotive, machinery, and oil & gas industries for high-strength components like gears, shafts, and bolts.
A: It offers high tensile strength (≥100 kgf/mm²), excellent elongation (≥12%), and good impact resistance.
A: SCM440 is usually supplied in a quenched and tempered condition to optimize its strength and ductility.
A: Yes, it has good machinability and weldability after appropriate heat treatment.
A: While not stainless, it has moderate corrosion resistance, which can be improved with coatings or alloying.
| Category | Parameter | Value |
| Chemical Composition | Carbon (C) | 0.38–0.43 |
| Silicon (Si) | 0.15–0.35 | |
| Manganese (Mn) | 0.60–0.85 | |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.040 | |
| Chromium (Cr) | 0.90–1.20 | |
| Molybdenum (Mo) | 0.15–0.30 | |
| Nickel (Ni) | ≤0.25 | |
| Copper (Cu) | ≤0.30 | |
| Mechanical Properties | Tensile Strength | ≥100 kgf/mm² |
| Yield Strength | ≥85 kgf/mm² | |
| Elongation | ≥12% | |
| Reduction of Area | ≥45% | |
| Impact Value | ≥6 J/cm² | |
| Hardness | 285–352 Hb | |
| Heat Treatment | Normalizing Temperature | 850–900°C |
| Cooling Method (Normalizing) | Air Cooling | |
| Annealing Temperature | 850°C | |
| Cooling Method (Annealing) | Furnace Cooling | |
| Forging | Initial Forging Temperature | 1150°C |
| Final Forging Temperature | 850°C | |
| Forging Ratio | ≥4:1 | |
| Post-Forging Treatment | Slow Cooling in Sand |
1. Exceptional Corrosion Resistance: One of the most notable features of many alloy steels is their outstanding corrosion resistance. Steels alloyed with chromium, for example, form a thin, passive oxide layer on the surface that acts as a barrier against moisture, oxygen, and other corrosive agents. Stainless steel, a well - known type of alloy steel with a chromium content of at least 10.5%, is highly resistant to rust and staining, making it ideal for applications in the food and beverage industry, marine environments, and medical equipment. Other alloying elements like nickel and molybdenum can further enhance corrosion resistance, enabling the steel to withstand even more aggressive chemical environments.
2. High Strength and Toughness: Alloy steels are designed to offer significantly higher strength and toughness compared to carbon steel. By adding elements such as manganese, vanadium, and nickel, the steel's microstructure can be modified to increase its tensile strength, yield strength, and impact resistance. This makes alloy steel suitable for applications where components need to bear heavy loads, resist deformation, and absorb energy without fracturing. For instance, in the aerospace industry, alloy steels are used for critical components like landing gear, engine parts, and structural frames, where failure is not an option.
3. Heat Resistance: Many alloy steels are engineered to perform well at elevated temperatures. Elements like chromium, molybdenum, and tungsten form stable carbides and other compounds that prevent the steel from softening and losing its strength when exposed to high heat. This heat - resistant property makes alloy steel essential in applications such as power plant boilers, gas turbines, and automotive exhaust systems, where components are subjected to extreme thermal conditions.
4. Wear Resistance: Alloy steels can be formulated to have excellent wear resistance. By incorporating elements like chromium, vanadium, and tungsten, the steel can develop a hard and durable surface that resists abrasion, erosion, and galling. This is crucial in applications such as manufacturing cutting tools, gears, and bearings, where components are in constant contact with other surfaces and need to maintain their integrity over long periods of use.
1. Aerospace Industry: In the aerospace sector, alloy steel is used extensively due to its high strength - to - weight ratio, heat resistance, and corrosion resistance. Components such as landing gear, which need to support the weight of the aircraft during takeoff, landing, and taxiing, are made from high - strength alloy steels. Engine parts, including turbine blades and shafts, must withstand high temperatures and mechanical stresses, and alloy steels with heat - resistant properties are the materials of choice. The aerospace industry also relies on alloy steels for structural components to ensure the safety and reliability of aircraft in flight.
2. Oil and Gas Industry: The oil and gas industry operates in some of the harshest environments on earth, and alloy steel is essential for its equipment and infrastructure. Pipelines transporting oil and gas need to resist corrosion from the fluids they carry as well as the surrounding soil and water. Alloy steels with high corrosion resistance, such as those containing chromium and molybdenum, are used for pipeline construction. Drilling equipment, including drill bits, casings, and tubing, also requires alloy steels with high strength, wear resistance, and the ability to withstand high pressures and temperatures.
3. Medical Equipment Manufacturing: In the medical field, alloy steels like stainless steel are widely used for manufacturing surgical instruments, implants, and medical devices. The corrosion resistance of stainless steel ensures that the equipment remains hygienic and does not react with bodily fluids. Its strength and biocompatibility make it suitable for implants such as hip and knee replacements, where long - term reliability and compatibility with the human body are essential.
A: SCM440 is widely used in automotive, machinery, and oil & gas industries for high-strength components like gears, shafts, and bolts.
A: It offers high tensile strength (≥100 kgf/mm²), excellent elongation (≥12%), and good impact resistance.
A: SCM440 is usually supplied in a quenched and tempered condition to optimize its strength and ductility.
A: Yes, it has good machinability and weldability after appropriate heat treatment.
A: While not stainless, it has moderate corrosion resistance, which can be improved with coatings or alloying.
