40CrNiMo Round Bar

 

 

 

Standards	GB	AISI	JIS
Material	40CrNiMoA	4340	SNCM439(SNCM8)
C	0.37~0.44	0.38~0.43	0.36~0.43
Si	0.17~0.37	0.15~0.35	0.15~0.35
Mn	0.50~0.80	0.60~0.80	0.60~0.90
P	≤0.025	≤0.035	≤0.030
S	≤0.025	≤0.040	≤0.030
Cr	0.60~0.90	0.70~0.90	0.60~1.00
Ni	1.25~1.65	1.65~2.00	1.60~2.00
Mo	0.15~0.25	0.20~0.30	0.15~0.30

 

 

Mechanical Properties

Yield strength: ≥ 835 MPa

Tensile strength: ≥ 980 MPa

Elongation: ≥12%

Rate of reduction in area: ≥55%

Impact absorbing energy: ≥ 78 J

Material Brinell Hardness: ≤ 269 (Annealed or high temperature tempered steel rod)

Sample size: 25mm

 

Heat treatment specification

First quenching heating temperature: 850 °C (Quenchant– oil)

Tempering heating temperature: 600 °C (Quenchant– water, oil)

• Mechanical properties: The 40CrNiMo round bar exhibits high strength and toughness. It possesses excellent tensile strength, yield strength, and elongation. The material can withstand heavy loads and impacts, making it suitable for applications in machinery and equipment that demand high strength and durability. It also has good fatigue resistance and can endure repeated loading and unloading without significant degradation. Additionally, the steel has good hardness and wear resistance, ensuring a long service life in demanding environments.

 

The 40CrNiMo round bar has a wide range of applications due to its excellent properties.

This type of round bar is widely used in the manufacturing of various mechanical parts and components. For instance, it is commonly employed in the production of gears, shafts, and bolts. In the automotive industry, 40CrNiMo round bars can be found in engine parts and transmission systems. The high strength and toughness of this material make it ideal for withstanding the harsh operating conditions within an engine. It provides reliable performance and durability, ensuring the smooth operation of vehicles.

In the field of machinery manufacturing, 40CrNiMo round bars are utilized for making heavy-duty machinery parts. These parts need to endure high loads and stresses, and the superior mechanical properties of 40CrNiMo make it a perfect choice. It can withstand the rigors of continuous operation and is resistant to wear and fatigue.

Moreover, this material is also suitable for applications in the oil and gas industry. It can be used in the construction of pipelines and drilling equipment. The corrosion resistance and strength of 40CrNiMo ensure the safety and reliability of these critical infrastructure components.

In general, the 40CrNiMo round bar plays an important role in various industries. Its combination of high strength, toughness, wear resistance, and corrosion resistance makes it a versatile and reliable material for a wide range of applications. Whether it's in the automotive, machinery, or oil and gas sectors, 40CrNiMo round bars are trusted for their outstanding performance and durability.

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