SAE5140 Steels, 41Cr4, DIN 1.7035 Alloy Machinery Steels (Treatment Steels)
PRODUCT DESCRIPTION
SAE 5140 Steel (41Cr4, DIN 1.7035) is a medium-carbon chromium alloy offering high strength, wear resistance, and machinability for heavy-duty applications.PRODUCT TYPES
SAE 5140 Steel Overview
5140 steel, also known as 41Cr4 in the European standard (DIN 1.7035), is a medium-carbon chromium steel alloy that is widely used for manufacturing parts subjected to heavy loads and wear. It offers a good combination of tensile strength, toughness, and wear resistance, making it suitable for applications in the automotive, machinery, and engineering industries. It is commonly used in the production of gears, shafts, and crankshafts.
5140 steel has high hardenability and is usually heat-treated to improve its mechanical properties, making it ideal for parts that must withstand high stresses and wear. The steel is also known for its ability to be easily welded and machined, provided that suitable techniques and parameters are used.
Chemical Composition (in %)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Silicon (Si) | 0.20 – 0.35 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Nickel (Ni) | 0.25 max |
Physical Properties
- Density: 7.85 g/cm³ (or 7850 kg/m³)
- Tensile Strength (Rm): 850–1000 MPa
- Yield Strength (Rp0.2): 655 MPa (min)
- Elongation (A): ≥ 20% (for thickness up to 20 mm)
- Hardness (HB): 255–330 (depending on heat treatment)
Machinability
5140 steel exhibits good machinability. It can be easily machined using conventional methods such as turning, drilling, and milling. However, when hardened, the material becomes harder to machine, requiring appropriate cutting tools and conditions to avoid excessive tool wear.
Weldability
5140 steel is weldable using traditional welding methods (MIG, TIG, arc welding). Preheating and post-weld heat treatment (PWHT) are often required to minimize the risk of cracking in thicker sections. It is recommended to use low-hydrogen electrodes for optimal weld quality.
Applications
5140 steel is commonly used in high-stress, heavy-duty applications. Its primary uses include:
- Automotive Industry: Gear shafts, crankshafts, axles, and connecting rods.
- Machine Building: Components like gears, shafts, and heavy-duty parts.
- Heavy Equipment Manufacturing: Parts for construction and mining equipment.
- Oil & Gas: Parts that need high fatigue and impact resistance.
Industries Using 5140 Steel
- Automotive: Gears, crankshafts, and other high-load components.
- Machine Building: Bearings, shafts, and other mechanical components.
- Heavy Equipment: Construction and mining machinery parts.
- Oil & Gas: Equipment exposed to high stress and wear.
Key Advantages of 5140 Steel
- High Strength: Capable of withstanding high stress and heavy loads.
- Wear Resistance: Excellent resistance to wear and abrasion.
- Good Toughness: Suitable for dynamic loads and high-impact applications.
- Versatility: Widely used across various industries, including automotive and machinery.