The special supply of 40Cr steel pipes adheres to the standards outlined in GB/T 3077-2008. According to this specification, the chemical composition of 40Cr steel pipes is as follows: carbon (C) ranges between 0.37% and 0.44%, silicon (Si) falls within 0.17% to 0.37%, manganese (Mn) is between 0.50% and 0.80%, chromium (Cr) ranges from 0.80% to 1.10%, and nickel (Ni) is capped at 0.30% or less.
For a blank size of 25 mm, the mechanical properties of 40Cr steel pipes can be achieved through specific heat treatment processes. First, the quenching process requires heating the material to 850°C, followed by cooling using oil. Subsequent treatments include a secondary quenching step with an oil bath heated to an unspecified temperature, then tempering at 520°C, with cooling done either in water or oil. After these processes, the tensile strength (σb) reaches approximately 980 MPa, while the yield point (σs) is around 785 MPa. The elongation after fracture (δ5) is roughly 9%, the area shrinkage (ψ) is about 45%, and the impact absorption work (Aku2) is measured at 47 J. When annealed or tempered at high temperatures, the Brinell hardness (HBS100/3000) typically measures 207.
This information regarding 40Cr steel pipes is derived from comprehensive technical studies and industry standards. Understanding these properties is crucial for applications requiring high strength and durability, such as in automotive components, gears, and structural parts. Additional research into the exact yield point and other specific values could provide even more precise data for engineering purposes.
While the provided data offers a solid foundation for evaluating 40Cr steel pipes, further testing under controlled conditions might yield more detailed insights into their performance across various industrial applications. This understanding can help optimize manufacturing processes and ensure compliance with stringent quality requirements.
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