Description
42CrMo4 – Bright Bar Overview:
42CrMo4 is a high-grade alloy steel commonly used in the engineering sector, containing chromium and molybdenum as its main alloying elements. It is classified as a low-alloy steel, known for its high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. This steel can be subjected to various heat treatments to enhance its mechanical properties, making it suitable for a wide range of industrial applications.
42CrMo4 – Bright Bar Applications:
42CrMo4 bright bars are widely used in industries for manufacturing:
- Gears
- Bolts
- Shafts
- Axles
- Drill collars
- Spindles
- Dies
- Other machine components that require high strength and toughness
42CrMo4 – Bright Bar Equivalent Grades:
- AISI 4140
- SAE 4140
- 42CrMoS4
- Din 1.7225
Addition to Other Grades:
- MS
- EN1A
- EN3B
- EN8, EN8D, EN9
- EN24, EN31, EN32B, EN36C, EN41B, EN43B
- EN47, EN353
- IS2062
- 42CrMo4
- HCHCR, D2, D3, H-11, H-13, CW-1, OHNS
- M2, M35, M42
- DIN-1.2714
- P20, P20+S, P20+Ni
- SCM420
- ASTM SA-36, ASTM SA-105
- SAE1018, SAE1010, SAE8620, SAE52100
- 16MnCr5, 20MnCr5
- C20, C45, C50, C60, CK45
- 20C8, 40C8, 45C8, 55C8
- C55Mn75, S40C
- S355J2G3
Chemical Composition of 42CrMo4 Steel:
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.38-0.45 |
| Silicon (Si) | Max 0.40 |
| Manganese (Mn) | 0.60-0.90 |
| Sulfur (S) | Max 0.035 |
| Phosphorus (P) | Max 0.035 |
| Chromium (Cr) | 0.90-1.20 |
| Molybdenum (Mo) | 0.15-0.30 |
Mechanical Properties of 42CrMo4 – Bright Bar:
42CrMo4 offers high strength, toughness, and hardness in its heat-treated condition. Specific mechanical properties depend on the heat treatment process.
Hardness of 42CrMo4 – Bright Bar:
Hardness can vary based on the treatment process, typically achieving a hardness between 230-290 HBW (Brinell hardness) in its normalized condition.
42CrMo4 – Bright Bar Heat Treatment:
Heat treatment processes like hardening, tempering, and annealing can be applied to 42CrMo4 to enhance specific properties:
- Hardening: This involves heating to around 820-880°C and quenching in oil or water, followed by tempering.
- Tempering: Tempering is performed between 540°C and 680°C to balance hardness and toughness.
42CrMo4 – Bright Bar Physical Properties:
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
Thermal Properties of 42CrMo4 – Bright Bar:
The thermal properties include good heat resistance, and it is suitable for parts exposed to varying temperatures during use.
Forging Properties of 42CrMo4 – Bright Bar:
42CrMo4 can be forged at temperatures ranging from 850°C to 1050°C. After forging, it is recommended to cool it in sand or a furnace to avoid stresses.
Stress Relieving of 42CrMo4 – Bright Bar:
Stress relieving is done by heating the steel to around 550°C – 650°C for a period of time, followed by slow cooling. This helps reduce the stresses induced by machining or heat treatment.
Normalizing of 42CrMo4 – Bright Bar:
Normalizing involves heating to around 870°C – 900°C, followed by air cooling. This improves machinability and refines the grain structure.
Annealing of 42CrMo4 – Bright Bar:
Annealing is performed by heating to around 680°C to 720°C, followed by slow cooling. This process helps to improve machinability and relieve internal stresses.
Machinability of 42CrMo4 – Bright Bar:
42CrMo4 has good machinability in both the annealed and normalized condition, making it suitable for precision parts and components. High-speed steel or carbide tools are typically used for machining this grade.
Welding of 42CrMo4 – Bright Bar:
Welding 42CrMo4 requires preheating to 200-300°C, followed by post-weld heat treatment to avoid cracking and improve weld integrity. The recommended filler material should match the base composition.
