aisi 4140 alloy steel metal guide: chemical, properties, application
aisi 4140 alloy steel comprehensive introduction
what is 4140 alloy steel
4140 alloy steel is a type of low-alloy steel that is commonly used in various industries due to its high tensile strength, toughness, and excellent mechanical properties. It is often referred to as AISI 4140 steel or alloy 4140. The chemical composition of 4140 steel includes chromium and molybdenum, which provide good hardness and high strength. The steel is typically available in round bar form and can be machined easily in the annealed condition. Heat treatment can be performed to further enhance its hardness and strength.
The high tensile strength of 4140 steel makes it suitable for applications such as axles, spindles, shafts, and machine components that require high strength and durability. It also has good machinability, especially when cold-drawn. In addition to its physical properties, 4140 steel also exhibits high fatigue strength and torsional strength, making it suitable for high-stress applications.
Comparison purposes can be made with other steels such as 8620 steel, which has similar properties but lower carbon content. The steel in the annealed or heat-treated condition can be welded with appropriate techniques. The corrosion resistance of 4140 steel can be improved through the addition of manganese or other elements. Forging is also a common method used to shape 4140 alloy steel due to its ductility.
If you are looking to buy 4140 alloy steel, it is commonly available in various forms such as round bars and is often referred to as chrome-molybdenum or chrome-moly steel. It is important to consider the required hardness, tensile strength, and other mechanical properties for the specific application. The chemical composition and heat treatment should also be taken into account to ensure optimal performance.
chemical component of 4140 alloy steel
Element | Composition [%] |
Carbon (C) | 0.38 – 0.43 |
Chromium (Cr) | 0.80 – 1.10 |
Molybdenum (Mo) | 0.15 – 0.25 |
Manganese (Mn) | 0.75 – 1.00 |
Silicon (Si) | 0.15 – 0.30 |
Sulfur (S) | 0.04 |
Phosphorus (P) | 0.035 |
Iron (Fe) | Balance |
mechanical properties of 4140 alloy steel
Property | Value |
Density [g/cm3] | 7.85 |
Yield Strength [MPa] | 415 |
Hardness (Brinell) | 197 |
Magnetism | Magnetic |
What Are Equivalents of 4140 Alloy Steel?
Country Standard | Equivalent Grade |
China GB/T 3077 | 42CrMo |
Germany DIN 17200 | 1.7225/ 42crmo4 |
Great Britain BS 970 | 42CrMo4 |
Japan JIS G4105 | SCM440 |
USA ASTM A29 | 4140 |
What Are the Advantages of Using 4140 Alloy Steel?
4140 alloy steel is a high tensile steel that offers a range of advantages. One of the main advantages is its excellent toughness, making it suitable for applications that require high-strength steel. The high chromium content of 4140 provides good hardness and wear resistance, as well as good hardness penetration. This makes it ideal for tool and die applications, where hardness and wear resistance are crucial. Another advantage of 4140 alloy steel is its weldability. While some tool steels can be difficult to weld, 4140 can be successfully welded with the right procedures and precautions. Additionally, 4140 can be hardened and heat treated to increase its strength. By heating it to a specific temperature and then quenching it in still air or oil, the steel can be hardened to a Rockwell C hardness of around 26-32. The steel can then be tempered at a lower temperature, typically around 538°C (1000°F), to improve its ductility and toughness.
Heat Treatment of 4140 Alloy Steel
The heat treatment of 4140 alloy steel involves several steps to achieve the desired properties. The steel is typically cold drawn or cold rolled to improve its ductility and dimensional accuracy. The chromium content in the alloy provides good hardness, while the carbon content provides good hardness penetration. This makes 4140 ideal for applications that require good fatigue strength and abrasion resistance. The steel is often used in chain links, collars, and other components that require a combination of strength and toughness.
During the heat treatment process, the steel is heated to a relatively high temperature and then cooled at a controlled rate. This process helps to refine the grain structure and enhance the mechanical properties of the steel. The steel is also tempered at a specific temperature to further improve its toughness and ductility. It is important to carefully control the heating and cooling rates to avoid the risk of distortion or cracking.
quenched and tempered of 4140 alloy steel
Quenched and tempered of 4140 alloy steel is a common process used to increase the hardness and strength of the material. The 4140 alloy steel, which contains chromium, offers good hardness due to its chromium content. It is typically used in various industrial applications, thanks to its customization abilities and good ductility. The quenching process involves rapidly cooling the work piece, typically by immersing it in water or oil, to achieve a hardened state. This hardened state provides the desired hardness and strength, but it can also result in increased brittleness. To reduce this brittleness, the material is then tempered, which involves heating it to a specific temperature and then cooling it slowly. The tempering temperature and duration can be adjusted to achieve the desired balance between hardness and ductility. However, it should be noted that the opinions expressed in newsletters you may receive or sponsored content are not always reliable sources of information.
Machinability of 4140 Alloy Steel
The machinability of 4140 alloy steel is highly influenced by the chromium content which provides good hardness. 4140 alloy steel is a popular choice for various applications due to its excellent combination of toughness, strength, and fatigue resistance. It is commonly used for making machine parts, automotive components, and tools. The sae 4140 include both carbon steels and alloy steels, with different percentages of carbon and other elements. One of the key factors that affects machinability is the weld heat affected zone in which the material softens and becomes more ductile. This can lead to higher cutting forces and requires more pressure during machining. The machinability of 4140 also depends on the thickness of the material being machined. Thicker sections may pose challenges due to the wide field range of hardness properties. Overall, the machinability of 4140 can be optimized through proper tool selection, cutting parameters, and cooling methods to achieve desired editorial highlights along the entire value chain. The determination of machinability can be assessed with the help of NMR techniques.
Forged of 4140 Alloy Steel
Forged of 4140 Alloy Steel is a high-quality alloy steel that is commonly used in different industries due to its superior strength and durability. This type of steel is classified as an alloy steel, which means it is composed primarily of iron, but with significant amounts of other elements, including chromium. The chromium content in 4140 Alloy Steel provides good hardness, making it suitable for applications that require resistance against wear, abrasion, and impact. Additionally, 4140 Alloy Steel is known for its excellent toughness and high tensile strength, making it an ideal choice for making components and parts that need to withstand heavy loads and extreme conditions. Whether it is for manufacturing tools, machinery parts, or even automotive components, 4140 Alloy Steel, with its 41l40 grade, is widely regarded as a reliable and versatile material in the industry.
About 4140 L80 Grade:
The 4140 L80 Grade is an alloy steel that is known for its high hardness. This grade contains chromium content that enhances its hardness. Chromium is a key element in the composition of this alloy steel, providing it with excellent strength and durability. The presence of chromium also improves the corrosion resistance of the 4140 L80 Grade. This alloy steel is widely used in various industries, including the oil and gas sector, where its hardness and strength are highly valued. The combination of its chromium content and other alloying elements makes the 4140 L80 Grade a reliable and versatile material for different applications. With its excellent hardness, this grade of alloy steel can withstand heavy loads and high-stress conditions.
About 4140 P110 Grade:
4140 P110 Grade is an alloy steel that contains a chromium content, which provides good hardness. Chromium is a key element in this type of steel, as it enhances its overall strength and toughness. The presence of chromium in the steel helps to improve its resistance to wear, corrosion, and high temperatures. The alloy steel composition of 4140 P110 Grade also includes other elements such as carbon, manganese, and molybdenum, which further contribute to its strength and durability. This particular grade of steel is commonly used in various applications, including the manufacturing of tools, machinery parts, and oil and gas drilling equipment. Its combination of hardness, toughness, and resistance to different forms of damage make it a reliable and versatile choice for demanding industries.
AISI 4140 Steel in Oil Field:
AISI 4140 Steel is widely utilized in the oil field industry due to its exceptional properties. This alloy steel contains a significant amount of chromium, which gives it good hardness. The chromium content in AISI 4140 Steel provides excellent resistance against wear and abrasion, making it ideal for applications in harsh environments encountered in the oil field. Its high strength and toughness also add to its popularity in this industry. The presence of chromium in the alloy steel enhances its corrosion resistance, ensuring its durability in oil field operations. AISI 4140 Steel is often used in the production of drill collars, line pipes, and drilling components. Its reliability and quality make it a preferred choice among engineers and manufacturers working in the oil field.