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High-strength seamless steel pipe with good fatigue resistance and manufacturing method thereof

A technology of seamless steel pipes and manufacturing methods, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as grinding cracks and quenching cracks, achieve good anti-torsion fatigue life, good room temperature mechanical properties, and broad application prospects Effect

Active Publication Date: 2022-08-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention patent uses high C, Mn, Cr and controls the ratio of Ti / B / N to achieve high strength and hardenability, but too high C is prone to problems such as quenching cracks and grinding cracks in the quenching and tempering process

Method used

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  • High-strength seamless steel pipe with good fatigue resistance and manufacturing method thereof
  • High-strength seamless steel pipe with good fatigue resistance and manufacturing method thereof
  • High-strength seamless steel pipe with good fatigue resistance and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-15 and comparative example 1-5

[0067] The high-strength seamless steel pipes with good fatigue resistance of Examples 1-15 and the comparative seamless steel pipes of Comparative Examples 1-5 were prepared by the following steps:

[0068] (1) According to the chemical composition shown in Table 1 below, use an electric furnace or a converter for smelting and refining and casting to obtain a tube blank, and then continuous casting and cutting to obtain a tube blank of the desired size.

[0069] (2) Heating, piercing, hot rolling and sizing to obtain a hot-rolled tube: heat the tube blank at 1180-1300 °C for 2-6 hours, and then perform high-temperature piercing, hot-rolling and sizing at 950-1250 °C It is deformed at high temperature and processed into Ф52~76mm×4.5~8.5mm hot-rolled tubes.

[0070] (3) Intermediate heat treatment: control the hot-rolled tube to be annealed in the temperature range of 680 to 900 °C, and keep it for 0.25 to 3 hours.

[0071] (4) Cold drawn or cold rolled.

[0072] (5) Normaliz...

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Abstract

The invention discloses a high-strength seamless steel tube with good fatigue resistance. The high-strength seamless steel tube further comprises the following chemical elements in percentage by mass besides Fe and inevitable impurities: 0.28 to 0.38 percent of C, less than or equal to 0.35 percent of Si, 0.5 to 1.0 percent of Mn, 0.6 to 1.6 percent of Cr, 0.1 to 0.35 percent of Mo, 0.0035 to 0.0085 percent of N, 0.020 to 0.055 percent of Al and 0.0005 to 0.005 percent of Ca. In addition, the invention also discloses a manufacturing method of the high-strength seamless steel tube, which comprises the following steps: (1) preparing a tube blank; (2) heating, perforating, hot-rolling and sizing to obtain a hot-rolled pipe; (3) intermediate heat treatment; (4) cold drawing or cold rolling; and (5) normalizing or annealing heat treatment.

Description

technical field [0001] The invention relates to a seamless steel pipe and a manufacturing method thereof, in particular to a high-strength seamless steel pipe and a manufacturing method thereof. Background technique [0002] In recent years, with the tightening of environmental protection regulations and policies in my country, the market and users have higher and higher requirements for energy conservation and emission reduction of automobiles. Auto parts, such as drive shaft products, which account for a small proportion of the weight of the vehicle, are also included in the weight reduction. It is a general trend to replace solid bars and forgings with hollow tubes. [0003] Components such as drive shafts for automobiles are very important safety components that transmit engine torque to the drive wheels. Since the drive shaft needs to bear a huge torsional moment, as well as the traction force and braking force from the wheels, the force it bears includes longitudinal f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C21D1/25C21D1/26C21D1/28C21D6/00C21D8/10C21D9/08
CPCC22C38/02C22C38/04C22C38/22C22C38/001C22C38/06C22C38/002C21D1/28C21D1/26C21D1/25C21D6/002C21D6/005C21D6/008C21D8/105C21D9/085C21D2211/005C21D2211/009
Inventor 骆素珍刘慧芳刘文灏翟国丽
Owner BAOSHAN IRON & STEEL CO LTD
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