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High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip

A technology of high-strength steel and a manufacturing method, which is applied in the field of steel materials, seamless steel pipes and their manufacturing, can solve the problems of machinability limiting tensile performance and improvement of torsional fatigue performance, etc., achieve excellent quenching performance, avoid pipe bending , the effect of high strength and strong plastic product

Active Publication Date: 2015-10-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of Mn≤2.0%, the machinability of this technical solution limits the improvement of the tensile performance and torsional fatigue performance of the finished product

Method used

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  • High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip
  • High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip
  • High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip

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Experimental program
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Effect test

Embodiment A1-A10 and comparative example B1-B6

[0069] According to the following steps, high-strength plastic seamless steel pipes A1-A10 and comparative examples B1-B6 for automobile transmission half shafts according to the present invention are manufactured, and the steps are as follows:

[0070] (1) Manufacture tube blank, control its chemical element mass percentage distribution ratio as shown in Table 1;

[0071] (2) Heat the tube billet to 1200°C-1250°C in an annular heating furnace, and soak for 20-30min;

[0072] (3) Use a vertical conical hot piercer for hot piercing, with a piercing temperature of 1170-1200°C and continuous rolling;

[0073] (4) After reheating, use a three-roll tension reducer to reduce the diameter and wall thickness of the tube billet. The cooling bed is cooled by natural cooling without air cooling, and it is annealed in time at 550-850 ° C for 30-60 minutes;

[0074] (5) Phosphating and saponification after pickling;

[0075] (6) Use cold drawing or cold rolling to carry out cold processi...

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Abstract

The invention discloses high-strength steel. The high-strength steel comprises the following chemical elements in percentage by mass: 0.07% to 0.15% of C, 0.1% to 1.0% of Si, 2.0% to 2.6% of Mn, 0.05% to 0.6% of Ni, 0.2% to 1.0% of Cr, 0.1% to 0.6% of Mo, 0.001% to 0.006% of B, 0.05% to 0.50% of Cu, 0.015% to 0.060% of Al, 0.02% to 0.1% of Nb, 0.02% to 0.15% of V, and the balance Fe and unavoidable impurities. Correspondingly, the invention further discloses a high-strength plastic seamless steel pipe for automotive driver shafts. The high-strength plastic seamless steel pipe for the automotive driver shafts is manufactured by the high-strength steel. In addition, the invention further discloses a manufacturing method of the high-strength plastic seamless steel pipe for the automotive driver shafts. The high-strength plastic seamless steel pipe for the automotive driver shafts is high in strength, high in strength and ductility product and good in anti-torsion fatigue performance.

Description

technical field [0001] The invention relates to a steel material, a seamless steel pipe and a manufacturing method thereof, in particular to a high-strength plastic seamless steel pipe and a manufacturing method thereof. Background technique [0002] With the current society's requirements for energy saving and emission reduction, the requirements for lightweight automobile bodies are getting higher and higher. The shaft products for automobiles, especially the circular transmission products that bear torsional moment, when they are subjected to torsional moment, the farther they are from the center of the circle, the greater the torsional moment they will bear, and the torsion moment received at the center of the circle is zero, so Using hollow steel pipe instead of solid bar as the transmission shaft can greatly reduce the weight of the vehicle body on the one hand, but on the other hand, it will not cause too much impact on its use. [0003] Specifically speaking, the ax...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21D8/10
Inventor 翟国丽王起江田青超张清廉
Owner BAOSHAN IRON & STEEL CO LTD
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