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

Active Publication Date: 2016-04-20
BEIJING TAIPU INT PIPE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problem to be solved by this application is to provide a seamless steel pipe for truck axles, so as to solve the cracks after being pushed out in the seamless steel pipes for automobile axles produced according to "Seamless Steel Pipes for Automobile Semi-hanging Axles" YB / T4203-2009 and quality problems of fatigue test cracks

Method used

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  • Seamless steel pipe for vehicle shaft and manufacturing method
  • Seamless steel pipe for vehicle shaft and manufacturing method
  • Seamless steel pipe for vehicle shaft and manufacturing method

Examples

Experimental program
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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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Abstract

The invention discloses a seamless steel pipe for a vehicle shaft. The seamless steel pipe is characterized in that a material forming the seamless steel pipe comprises the chemical components of Fe, C, Si, Mn, P, S, Al, Mo, Cr, Ni and Cu, wherein the mass percentages of the chemical components are as follows: 0.19-0.23% of C, 0.17-0.37% of Si, 1.50-1.70% of Mn, P not more than 0.020%, S not more than 0.010%, 0.025-0.045% of Al, Mo not more than 0.10%, Cr not more than 0.10%, Ni not more than 0.10%, and Cu not more than 0.20%. The seamless steel pipe for the vehicle shaft, provided by the invention, has better performances than a steel pipe staged by the black metallurgical industry standard of the People's Republic of China-seamless steel pipe for vehicle semitrailer shaft YB / T4203-2009, and solves the technical problems of generation of cracks in the square pushing process of an integral bearing square shaft and generation of cracks in the square pushing and expanding process of a drive axle shell in a seamless steel pipe produced according to the black metallurgical industry standard of the People's Republic of China-seamless steel pipe for vehicle semitrailer shaft YB / T4203-2009.

Description

technical field [0001] The invention relates to a seamless steel pipe and a manufacturing method, in particular to a seamless steel pipe for an automobile shaft and a manufacturing method. Background technique [0002] The demand for light trucks, heavy trucks and their trailers is increasing in the modern automobile transportation industry, and seamless steel pipes for shafts that are lightweight, overload-resistant, and long-lasting are essential components for manufacturing automobiles. The existing People's Republic of China's ferrous metallurgical industry standard "Seamless Steel Tubes for Automobile Semi-hanging Shafts" YB / T4203-2009 only makes some regulations on the production of seamless steel pipes for automobile axles, but there are many in North China, East China and South China. When axle manufacturing enterprises carry out industrialized production, the seamless steel pipes for automobile axles produced according to the above standards have problems such as cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C33/04C21D9/08C21D1/18F16L9/02
CPCC21D1/18C21D9/085C22C33/04C22C38/02C22C38/04C22C38/06F16L9/02
Inventor 张子夜张宁凯朱荣辉
Owner BEIJING TAIPU INT PIPE CO LTD
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