Seamless steel pipe for vehicle shaft and manufacturing method
A technology for seamless steel pipes and manufacturing methods, applied in the direction of manufacturing tools, pipes, rigid pipes, etc., can solve problems such as cracks in fatigue test cracks, and achieve the effects of mild implementation conditions, good safety performance, and improved performance
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Embodiment 1
[0032] The present embodiment 1 provides a seamless steel pipe for automobile shaft, which is characterized in that the chemical composition of the seamless steel pipe includes Fe, C, Si, Mn, P, S, Al, Mo, Cr, Ni, Cu, wherein C, The mass percentages of Si, Mn, P, S, Al, Mo, Cr, Ni, Cu are: C0.19~0.23%; Si0.17~0.37%; Mn1.50~1.70%; P≤0.020%; S≤ 0.010%; Al0.025~0.045%; Mo≤0.10%; Cr≤0.10%; Ni≤0.10%; Cu≤0.20%.
[0033] The following describes the role of the main alloying elements in seamless steel pipes for axles:
[0034] C: 0.19-0.23%. Carbon is a carbide-forming element that can increase the strength of steel. If it is too low, the effect is not obvious, and if it is too high, it will greatly reduce the toughness of steel. In the axle tube, the strength index cannot be guaranteed if it is less than 0.19%, and the plasticity index cannot be guaranteed if it is higher than 0.23%.
[0035] Si: 0.17-0.37%. Silicon can improve the strength, wear resistance and oxidation resistance...
Embodiment 2
[0046] This embodiment 2 provides a seamless steel pipe for the load-bearing axle of a load-bearing automobile, which is characterized in that the chemical composition of the material constituting the seamless steel pipe is: C0.19-0.23%; Si0.17-0.37%; Mn1.50 ~1.70%; P≤0.020%; S≤0.010%; Al0.025~0.045%; Mo≤0.10%; Percentages add up to 100%.
[0047] Preferably, the seamless steel pipe for the automobile shaft is a seamless steel pipe (CZ20Mn2) for the automobile bearing shaft, and its mechanical properties meet the following requirements:
[0048] After heat treatment: heat preservation at 880±10°C for 30 minutes, quenching, water quenching; heat preservation at 550±10°C for 60 minutes, tempering, air cooling, tensile strength ≥ 685MPa, yield strength ≥ 590MPa, yield ratio ≤ 0.92, elongation after fracture ≥ 10 %, impact absorbed energy ≥ 60KV2 / J;
[0049] Hot-rolled state: elongation ≥ 20%, surface hardness 150-187HBW. There are strict mechanical performance requirements, an...
Embodiment 3
[0059] This embodiment 3 provides a seamless steel pipe for automobile drive shafts, which is characterized in that the chemical components constituting the seamless steel pipe include Fe, C, Si, Mn, P, S, Al, Mo, Cr, Ni, Cu, wherein The mass percentages of C, Si, Mn, P, S, Al, Mo, Cr, Ni, Cu are: C0.19~0.23%; Si0.17~0.37%; Mn1.50~1.70%; P≤0.020%; S≤0.010%; Al0.025~0.045%; Mo≤0.10%; Cr≤0.10%; Ni≤0.10%; Cu≤0.20%.
[0060] Preferably, the seamless steel pipe for the automobile shaft is a seamless steel pipe (QD20Mn2) for the automobile drive axle housing, and its mechanical properties meet the following requirements:
[0061] After heat treatment: heat preservation at 870±10°C for 30 minutes, quenching, water quenching; heat preservation at 530±10°C for 60 minutes, tempering, after air cooling, tensile strength ≥ 735MPa, yield strength ≥ 590MPa, yield ratio ≤ 0.92, elongation after fracture ≥ 15 %, impact absorption energy ≥ 60KV2 / J, steel pipe surface hardness 200-240HBW;
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