4140 Steel
Basic Info
4140 steel is a general alloy steel composed mainly of iron, carbon, chromium, and manganese, and usually also contains small amounts of silicon, phosphorus, and sulfur. Its chemical composition includes approximately 0.38% to 0.43% carbon, 0.75% to 1.00% chromium, 0.15% to 0.30% silicon, 0.80% to 1.10% manganese, and small amounts of sulfur and phosphorus. This alloy steel obtains its excellent mechanical properties through heat treatment.
4140 steel has good strength, toughness, and wear resistance, making it suitable for manufacturing high-demand mechanical parts and tools, such as bearings, shafts, gears, pins, bolts, etc. It is also commonly used to make materials in shapes such as steel pipes, steel plates, and steel rods.
The properties of 4140 steel can be adjusted through a variety of heat treatment processes, such as normalizing, quenching, and tempering, to meet different application needs. This steel has a wide range of applications in the engineering field and has become one of the preferred materials in many industries due to its good workability and weldability.
4140 Steel Data Sheet
Specifications
Comparison Table of Steel Production Standards
Chemical Composition
Mechanical Performance Comparison Table
Specifications
For Plates, the specifications include:
- Thickness: 1-600 mm
- Width: 2200-2400 mm
- Length: 9500 mm, 10000 mm, 11000 mm, or custom millimeter sizes.
For Rods, the specifications include:
- Diameter: 5-1400 mm
- Production methods: rolling, cold drawing, forging.
For Pipes, the specifications include:
- Diameter: 57-508 mm
- Wall thickness: 8-130 mm.
Comparison Table of Steel Production Standards
GB/T 3077: 42CrMo
- British Standard: BS:708M40 (En19)
- American Standard: ASTM A29:4140
- European Standard: EN/DIN: 42CrMo4 (1.7225)
- Japanese Standard: JIS: SCM440
GB/T 8162: 42CrMo
- British Standard: BS:709M40
- American Standard: ASTM A322:4140
- Japanese Standard: JIS: SCM4
- GB/T 3078: 42CrMo
- American Standard: ASTM A331:4140
GB/T 11251: 42CrMo
- American Standard: ASTM A505:4140
GB/T 3077-2015: 42CrMo
- American Standard: ASTM A513:4140
- American Standard: ASTM A519:4140
- American Standard: ASTM A466:4140
- American Standard: ASTM A752:4140
- American Standard: ASTM A829:4140
- American Standard: AMS 6381:4140
- American Standard: AMS 6382:4140
- American Standard: AMS 6390:4140
- American Standard: AMS 6349:4140
- American Standard: AMS 6529:4140
Chemical Composition
Carbon (C):
- 0.38% – 0.43%
Silicon (Si):
- 0.15% – 0.35%
Manganese (Mn):
- 0.75% – 1.00%
Phosphorus (P):
- Maximum 0.035%
Sulfur (S):
- Maximum 0.040%
Chromium (Cr):
- 0.80% – 1.10%
Molybdenum (Mo):
- 0.15% – 0.25%
Nickel (Ni):
- Maximum 0.25%
Copper (Cu):
- Maximum 0.35%
Mechanical Performance Comparison Table
Steel Number: 4140
- Yield Strength (MPa): 850-1000
- Tensile Strength (MPa): 980-1100
- Elongation (%): 12-15
- Hardness (HB): 28-32
Introduction
4140 steel is a high-quality alloy steel known for its excellent mechanical properties and diverse applications. To realize its full potential, 4140 steel typically requires a carefully designed heat treatment process. The following is a detailed introduction to its heat treatment process and applications:
Heat Treatment Process
The heat treatment process of 4140 steel mainly includes solution treatment, quenching, and tempering. First, the alloying elements are dissolved by heating the steel to the solid solution temperature (usually about 815°C to 870°C), and then rapidly cooling to form a martensite structure, which is quenching. Quenched steel typically has high strength and hardness, but is also prone to embrittlement. To increase its toughness and adjust its hardness, it is then tempered, usually at temperatures between 150°C and 700°C, for a time depending on the desired properties. This heat treatment process allows 4140 steel to perform optimally in different applications.
Application
4140 steel is widely used in many fields due to its excellent properties. It is commonly used in the manufacture of high-strength components such as bearings, gears, bolts, and pins, and plays an important role in the manufacture of mechanical parts, tools, and molds. Its high strength and good wear resistance make it ideal for industries such as automotive, aerospace, energy, and mining. 4140 steel is also commonly used to manufacture components that operate in high-load and high-temperature environments, such as engine parts, shafts, and turbine components.
The 4140 steel we provide is made of excellent material and undergoes a precise heat treatment process to ensure it achieves optimal performance and reliability. Whether you need high-strength, high-hardness materials, or have special requirements for wear resistance and toughness, we can provide you with customized solutions.
