Seamless steel pipe for automobile steering device connecting rod, and preparation method thereof
A technology of automobile steering gear and seamless steel pipe, applied in the direction of pipe/pipe joint/pipe fitting, pipe, rigid pipe, etc., can solve the problems of low fatigue resistance, torsion resistance and shock resistance, and achieve excellent fatigue resistance, The effect of saving processing time and resources
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Embodiment 1
[0018] A method for preparing a seamless steel pipe for an automobile steering gear connecting rod, the preparation steps of the method are as follows:
[0019] (1) Smelting of tube blanks: the smelted tube blanks consist of C: 0.038 parts, Si: 0.02 parts, Mn: 0.45 parts, W: 0.65 parts, S: 0.01 parts, Al: 0.058 parts, V: 0.032 parts, Cu: 0.007 parts, Zr: 0.002 parts, Fe: 86 parts of these chemical components;
[0020] (2) Rolling of steel pipes: rolling the tube blanks into seamless steel pipes, the finish rolling temperature is 1200°C;
[0021] (3) Heat treatment of seamless steel pipes: the tempering temperature is 800°C, the heating time is 20min, and then tempered and air-cooled, and sizing and heat straightening are adopted at a high temperature of 500°C to obtain seamless steel pipes for automobile steering gear connecting rods .
Embodiment 2
[0023] A method for preparing a seamless steel pipe for an automobile steering gear connecting rod, the preparation steps of the method are as follows:
[0024] (1) Smelting of tube blanks: the smelted tube blanks are composed of C: 0.048 parts, Si: 0.03 parts, Mn: 0.72 parts, W: 1.05 parts, S: 0.03 parts, Al: 0.083 parts, V: 0.05 parts, Cu: 0.015 parts, Zr: 0.005 parts, Fe: 108 parts of these chemical components; rolling of steel pipes:
[0025] (2) Rolling the tube billet into a seamless steel tube, the finish rolling temperature is 1250°C;
[0026] (3) Heat treatment of seamless steel pipes: the tempering temperature is 900°C, the heating time is 60min, then tempered and air-cooled, and 680°C high temperature sizing and heat straightening are used to obtain seamless steel pipes for automobile steering gear connecting rods .
Embodiment 3
[0028] A method for preparing a seamless steel pipe for an automobile steering gear connecting rod, the preparation steps of the method are as follows:
[0029] (1) Smelting of tube blanks: the smelted tube blanks consist of C: 0.042 parts, Si: 0.023 parts, Mn: 0.55 parts, W: 0.78 parts, S: 0.016 parts, Al: 0.068 parts, V: 0.038 parts, Cu: 0.009 parts, Zr: 0.003 parts, Fe: 90 parts of these chemical components;
[0030] (2) Rolling of steel pipes: rolling the tube blanks into seamless steel pipes, the finish rolling temperature is 1220°C;
[0031] (3) Heat treatment of seamless steel pipes: the tempering temperature is 850°C, the heating time is 40min, and then tempered and air-cooled, and 600°C high-temperature sizing and heat straightening are used to obtain seamless steel pipes for automobile steering gear connecting rods .
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