3120, 4130, 4140, 5140, 6150, 8620 Alloy Steel Bar Rod Cold Drawn

1. What is an alloy steel AISI4140 bar/rod?

High-strength composite steel known as AISI4140 is frequently used in the production of machinery, vehicles, aircraft, and other industries.

Iron, carbon, chromium, molybdenum, manganese, silicon, and other elements make up its structure. It resists heat well and has strong mechanical qualities.

Due to its durability, high fatigue strength, wear resistance, and impact resistance, it is a popular material choice in many industries.

    The quenched and tempered state is where the AISI 4140 steel rod is most frequently utilized. It is used to create impact-resistant, high-strength parts, large-section pipe fittings, and other stress-bearing parts, such as the crankshaft of a forging press, the horizontal eccentric shaft of a horizontal forging press, etc.

alloy steel AISI4140 bar/rod heat treatment

Cutting: Workability In the annealed state, 1.7225 alloy tool steel has good cutting workability.

Shaping: DIN 1.7225 steel has high ductility. It can be formed using conventional techniques under annealed conditions. Because it is tougher than regular carbon steel, it requires more pressure or force to form.

Welding: 1.7225 alloy steel can be welded using all advanced techniques. However, welding under heat treatment will affect its mechanical properties, and post-weld heat treatment should be performed.

Heat Treatment: 1.7225 tool steel is heated at 845°C (1550°F) and then quenched in oil. Prior to hardening, it can be normalized by prolonged heating at 913°C (1675°F), followed by air cooling.

Forging: Forged at 926 to 1205°C (1700 to 2200°F)

Thermal Processing: 4140 Steel can be thermally processed at 816 to 1038°C (1500 to 1900°F)

Cold working: 1.7225 steel can be cold worked in the annealed condition using conventional methods.

Annealing: Heat to 800℃~850℃, keep warm until the cross-section temperature is uniform, and then cool in the furnace.

Normalizing: Heat the 1.7225 alloy steel to 870℃~900℃, keep it warm until the cross-section temperature is uniform, soak it for 10~15 minutes, and let it cool in the air.

Tempering: DIN 1.7225 steel can be tempered at 205 to 649°C (400 to 1200°F), depending on the desired hardness level. If the tempering temperature is lower, the hardness of the steel can be increased. For example, a tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), while a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).

2. Chemical composition of alloy steel 4140 bar/rod

Iron, carbon, chromium, molybdenum, manganese, silicon, and other elements make up the majority of the chemical makeup of 4140 alloy steel. In them, the carbon content ranges from 0.38 to 0.43 percent, the chromium ranges from 0.80 to 1.10 percent, and the molybdenum ranges from 0.15 to 0.25 percent. These additional components enhance the strength, toughness, and wear resistance of 4140 alloy steel.

3. Mechanical properties of alloy steel 4140 bar/rod

AISI4140 yield strength σs (MPa): ≥930(95) AISI4140 tensile strength σb (MPa): ≥1080(110) AISI4140 elongation δ5 (%): ≥12 AISI4140 area shrinkage ψ (%): ≥45 AISI4140 impact energy Akv (J): ≥63 AISI4140 impact toughness value αkv (J/cm2): ≥78(8) AISI4140 Hardness: ≤217HB

4140 alloy steel has excellent mechanical properties. Its yield strength is 655 MPa, tensile strength is 1080 MPa, and elongation is 20%. Its strength and heat resistance are also excellent in high-temperature environments. Therefore, it is widely used in fields that require high strength and high-temperature resistance.

The high strength of alloy steel 4140

Due to the presence of certain alloying elements, alloy steel 4140 has higher yield and tensile strengths than regular carbon steel. One of the most crucial metrics for assessing the effectiveness of alloy steel 4140 devices is its strength index. Due to its great strength, alloy steel 4140 is frequently utilized in the automotive, aerospace, and aviation industries.

The high wear resistance of alloy steel 4140

The alloy elements in alloy steel 4140 can be used in different proportions to increase the hardness and wear resistance of alloy steel 4140. These alloying elements can form high-hardness compounds in steel, thereby increasing the hardness and wear resistance of alloy steel 4140. This high wear resistance makes alloy steel 4140 widely used in engineering machinery, mining equipment, ships, and other fields.

High toughness of alloy steel 4140

alloy steel 4140's high toughness is a reference to its strong anti-fracture and anti-brittleness, or how difficult it is to break under force and load. Steel alloy is frequently used in the production of machinery, the oil industry, shipbuilding, and other industries. Among these, ship safety has significantly increased.

High-temperature resistance of alloy steel 4140

alloy steel 4140 alloy components may keep their mechanical properties at high temperatures and exhibit good high-temperature stability. alloy steel 4140 can be utilized in high-temperature situations such as aerospace engines, stoves, and other sectors that require great stability in such environments since it can keep mechanical attributes like strength, hardness, and wear resistance there.

4. Physical properties of alloy steel 4140 bar/rod

Density, thermal conductivity, linear expansion coefficient, and other characteristics of alloy steel 4140 are physical characteristics. alloy steel 4140 has a lower heat conductivity and a lower linear expansion coefficient than regular steel, but it has a higher density and a proportionally smaller degree of expansion.

5. Specifications of alloy steel 4140 bar/rod

Being a trustworthy alloy steel 4140 bar/rod manufacturer and supplier, Shanghai Yinggui Metal Pbaructs Company aims to make manufacturing easier for our business partners. Shanghai Yinggui Metal offers 3120, 3150, 4130, 4140, 4340, 5120, 5140, 6150, 8620 etc.

6. Applications and characteristics of alloy steel 4140 bar/rod

Performance characteristics of alloy steel 4140 bar/rod steel

In the production of machinery, as well as in autos, aircraft, and other industries, 140 alloy steel is frequently employed. High-strength gears, bearings, machine tools, and other parts are frequently produced in the equipment manufacturing industry. It is utilized in the automotive industry to make suspension systems, transmissions, and components for engines. It is employed in the aerospace industry to produce components for rocket engines, aircraft structural elements, etc.

Since the elemental composition of alloy steel 4140 is more complex, its heat treatment performance is also relatively higher. The strength, toughness, corrosion resistance, and processability of alloy steel 4140 can be improved through targeted heat treatment processes.

7. Main alloy steel product brand list