Special Supply: Chemical Composition and Mechanical Properties of 40Cr Steel Pipes According to GB/T 3077-2008
The chemical composition of 40Cr steel pipes (by mass fraction, %) is as follows: carbon (C) ranges between 0.37% and 0.44%, silicon (Si) falls between 0.17% and 0.37%, manganese (Mn) is between 0.50% and 0.80%, chromium (Cr) is within 0.80% to 1.10%, and nickel (Ni) is limited to no more than 0.30%.
For a blank size of 25 mm, the mechanical properties of the 40Cr steel pipe can be described as follows:
- First quenching heating temperature: 850°C, using oil as the cooling medium.
- Second quenching heating temperature: tempering at 520°C, with water or oil used for cooling.
- Tensile strength (σb) reaches approximately 980 MPa.
- Yield point (σs) is around 785 MPa.
- Elongation after fracture (δ5) is about 9%.
- Area reduction (ψ) is approximately 45%.
- Impact absorption energy (Aku2) is around 47 J.
- Brinell hardness (HBS100/3000), when in an annealed or high-temperature tempered state, measures about 207.
These details regarding the 40Cr steel pipe come from comprehensive technical documentation and industry standards. It’s worth noting that these properties are subject to slight variations depending on specific manufacturing processes and final heat treatment conditions. Additionally, the mechanical properties listed here are averages based on typical production practices, ensuring optimal performance in structural applications such as gears, shafts, and other critical components where both strength and toughness are essential.
Understanding these specifications helps engineers and manufacturers select materials that meet their exact requirements, balancing cost efficiency with performance demands. If you're working on projects involving 40Cr steel pipes, always refer to the latest standards and consult with suppliers to ensure compliance with your project's needs.
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