Steel for high-pressure oil pipe, high-pressure oil pipe and preparation method of high-pressure oil pipe

A technology for high-pressure oil pipes and steel pipes, which is applied in the fields of steel for oil pipes, steel pipes and their preparation. It can solve the problems of being unsuitable for high-pressure oil pipes, achieve good toughness, low production costs, and avoid cracking.

Active Publication Date: 2018-03-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the structure is tempered martensite, it is not suitable for the production of small-diameter high-pressure oil pipes

Method used

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  • Steel for high-pressure oil pipe, high-pressure oil pipe and preparation method of high-pressure oil pipe
  • Steel for high-pressure oil pipe, high-pressure oil pipe and preparation method of high-pressure oil pipe
  • Steel for high-pressure oil pipe, high-pressure oil pipe and preparation method of high-pressure oil pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 7

[0045] The high-pressure oil pipe material described in Embodiment 1-7 of the present invention is obtained by the following method, wherein the mass percentage ratio of chemical elements of the steel pipe is shown in Table 1, A1-A7 corresponds to Embodiment 1-7 of the present invention, and B1-B4 corresponds to Scale 1-4.

[0046] Examples 1 to 7 prepared a high-pressure oil pipe, using steel for high-pressure oil pipes, and the mass percentage ratio of chemical elements of its material components is:

[0047] C: 0.11-0.17%; Si: 0.1-0.5%; Mn: 1.2-1.7%; Al: 0.01-0.05%; Nb: 0.01-0.06%; V: 0.02-0.09%; : 0.0005-0.003; Ti: ≤0.03%; Cr: ≤0.2%; Ni: ≤0.2%; Cu: ≤0.3%; Ca: 0.001-0.01%; the balance is Fe and other unavoidable impurities; and chemical composition Satisfy the relationship 44 <12, the symbol of each element in the relational expression represents the quality of the corresponding element composition as a material component. The inevitable impurities of the steel for high-p...

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Abstract

The invention discloses steel for a high-pressure oil pipe, the high-pressure oil pipe and a preparation method of the high-pressure oil pipe. The steel for the high-pressure oil pipe is composed of the chemical components of, by mass, 0.11%-0.17% of C, 0.1%-0.5% of Si, 1.2%-1.7% of Mn, 0.01%-0.05% of Al, 0.01%-0.06% of Nb, 0.02%-0.09% of V, 0.05%-0.2% of Mo, 0.0005%-0.003% of B, not larger than 0.03% of Ti, not larger than 0.2% of Cr, not larger than 0.2% of Ni, not larger than 0.3% of Cu, 0.001%-0.01% of Ca and the balance Fe and other inevitable impurities, wherein the chemical components meet the relationship expression that 4<(B*Mo)/(C*Mn)*10<4> <12. The structure of the steel for the high-pressure oil pipe is ferrite + dispersive distribution carbide + tempered sorbite, the steel forthe high-pressure oil pipe can reach the high performance grade of 670 MPa and over, and the performance cost ratio of the steel for the high-pressure oil pipe is high .

Description

technical field [0001] The invention relates to a high-strength steel material, a steel pipe and a preparation method thereof, in particular to a steel for an oil pipe, a steel pipe and a preparation method thereof, which are applied to high-pressure oil pipe equipment of a high-pressure common rail fuel system and structural steel pipe equipment for engineering machinery in the technical field . Background technique [0002] There is a demand for more than one million medium and heavy engines every year in our country. With the aggravation of the world's energy crisis and environmental pollution, in order to save energy and reduce emissions, new engines must use high-pressure common rail systems. Common rail technology has remarkable fuel economy and low emission characteristics. In the common rail fuel system, the high-pressure fuel is delivered to the common fuel supply pipe by the high-pressure oil pump, and the oil pressure in the public fuel supply pipe is precisely c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/58C22C38/46C22C38/48C22C38/44C22C38/54C22C38/50C22C38/42C21D1/32C21D1/18C21D9/08
CPCC21D1/18C21D1/32C21D9/08C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 田青超陆建
Owner SHANGHAI UNIV
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