42CrMo4 is a commonly used alloy structural steel, which belongs to the category of French standard AFNOR 42CD4, German standard DIN 1.7225, American standard ASTM A29/A29M-04 and ISO standard ISO 683-17. It has the characteristics of high strength, high hardness, high wear resistance, high toughness, easy processing and good comprehensive mechanical properties. It is widely used in the manufacture of large gears, bearings, chucks, universal joints, motorcycle chains, and auto parts. Mechanical parts with high load, high temperature, high pressure and high speed operation. Its chemical composition is roughly: carbon 0.38%-0.45%, silicon 0.17%-0.37%, manganese 0.50%-0.80%, sulfur ≤ 0.025%, phosphorus ≤ 0.035%, chromium 0.90%-1.20%, molybdenum 0.15%-0.25% .

What is the chemical composition of 42CrMo4 steel?

The chemical composition of 42CrMo4 steel is roughly: carbon (C) 0.38%-0.45%, silicon (Si) 0.17%-0.37%, manganese (Mn) 0.50%-0.80%, sulfur (S) ≤ 0.025%, phosphorus (P) ≤0.035%, chromium (Cr) 0.90%-1.20%, molybdenum (Mo) 0.15%-0.25%. In addition, it also contains a small amount of other elements, such as copper (Cu), nickel (Ni), titanium (Ti) and aluminum (Al), the content of these elements is usually below 0.03%. The control of these chemical components can make the steel have high strength, high toughness, high wear resistance and other excellent properties, so 42CrMo4 steel is widely used in the field of machinery manufacturing.

What are the mechanical properties of 42CrMo4 steel?

The mechanical properties of 42CrMo4 steel are as follows:

Tensile strength (σb): 980-1200 MPa

Yield strength (σs): ≥785 MPa

Elongation (δ5): ≥9%

Hardness: 197-241 HBW

In general, 42CrMo4 steel has high strength, high hardness, high toughness and good wear resistance. These excellent mechanical properties make it widely used in the manufacture of large gears, bearings, chucks, universal joints, motorcycle chains, auto parts and other high-load, high-temperature, high-pressure, high-speed mechanical parts.

What are the physical properties of 42CrMo4 steel?

The physical properties of 42CrMo4 steel are as follows:

Density: 7.85 g/cm³

Melting point: 1420-1460°C

Coefficient of linear expansion: 11.7×10^-6/°C (20-100°C)

Thermal conductivity: 46.6 W/(m K) (100°C)

The density of 42CrMo4 steel is the same as that of ordinary carbon structural steel, and its high melting point makes it suitable for high temperature environments. When the temperature changes, its coefficient of linear expansion is very stable, and its thermal conductivity is high, indicating its good thermal conductivity. These physical properties are also one of the reasons why 42CrMo4 steel is widely used in the field of manufacturing high-temperature, high-pressure and high-speed mechanical parts.

What are the performance characteristics of 42CrMo4 steel?

The performance characteristics of 42CrMo4 steel are as follows:

High strength: 42CrMo4 steel has high strength, the tensile strength is about 980-1200 MPa, and the yield strength is ≥785 MPa.

Good toughness: Although 42CrMo4 steel has high strength, it has good toughness and fracture toughness due to its chemical composition and optimization of heat treatment process.

High hardness: Due to the high content of chromium and molybdenum in the steel and proper heat treatment, a hard oxide film is formed on the surface, so 42CrMo4 steel has high hardness.

Significant wear resistance: 42CrMo4 steel exhibits good wear resistance, which is due to its alloy structure and the compaction of the structure caused by the oil quenching heat treatment process.

Good low temperature processing performance: 42CrMo4 steel can still maintain good processing performance at low temperature, which makes it easier to handle in the process of manufacturing mechanical parts.

To sum up, 42CrMo4 steel has a variety of excellent properties, making it widely used in high-load and high-speed operation fields such as aviation, automobiles, and machinery manufacturing.

What is the corrosion resistance of 42CrMo4 steel?

42CrMo4 steel is not a material with good corrosion resistance, because it contains high chromium and molybdenum elements, these elements can improve the hardness, strength and wear resistance of steel, but at the same time it will also affect its corrosion resistance. If 42CrMo4 steel is exposed to a humid, acidic or alkaline environment for a long time, it is prone to corrosion and hydrogen embrittlement. Therefore, in the application field where the corrosion resistance of steel needs to be considered, it is recommended to choose materials such as stainless steel with better corrosion resistance. If 42CrMo4 steel needs to be used in a specific corrosion-resistant environment, its corrosion resistance can be improved by surface treatment or coating.

What are the uses of 42CrMo4 steel in automobile manufacturing?

42CrMo4 steel is a commonly used low-alloy high-strength steel, which is widely used in automobile manufacturing. The following are the main uses of 42CrMo4 steel in automobile manufacturing:

Engine: 42CrMo4 steel can be used for key parts of the engine, such as crankshaft, connecting rod, etc.

Gearbox: 42CrMo4 steel can be used for gearbox gears, bearings and other moving parts.

Brake system: 42CrMo4 steel can be used for brake discs and other brake system parts.

Suspension system: 42CrMo4 steel can be used for various parts of the suspension system, such as steering arms, ball studs, etc.

Chassis: 42CrMo4 steel can be used for important parts of the chassis structure, such as frame, front and rear axles, etc.

In short, 42CrMo4 steel has good mechanical properties and wear resistance, and is widely used in the manufacture of various important parts in automobile manufacturing.

How does 42CrMo4 steel make car shifting gear plates?

42CrMo4 steel is a commonly used low-alloy high-strength steel, which can be used to make various mechanical parts, including automotive gear plates. The following steps are usually required when making a car shifting gear plate:

Preliminary design: Determine the size and shape of the gear plate according to the requirements and technical parameters of the car.

Material selection: choose suitable materials, generally choose 42CrMo4 steel or similar low-alloy high-strength steel.

Cutting and processing: cut the raw material into proper size, and then process it precisely by machining, milling, drilling and other methods to make tooth plate parts that meet the design requirements.

Heat treatment: Carry out heat treatment on the tooth plate, mainly quenching, tempering and surface carburizing to improve its hardness, strength and wear resistance.

Inspection and assembly: Strictly inspect the gear plate to ensure its quality meets the standard requirements, then assemble it and install it on the car for use.

It should be noted that the production of the car shifting gear plate requires certain professional knowledge and skills, and it is recommended to be completed by a professional machining factory or manufacturer.

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