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High-temperature-resistant seamless steel pipe and preparation method thereof

A technology for seamless steel pipes and high temperature resistance, which is applied in the field of steel pipes and can solve the problems of complicated preparation process, poor high temperature resistance performance and mechanical strength of seamless steel pipes, etc.

Active Publication Date: 2021-07-13
无锡恒丰祥钢管科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides a high-temperature-resistant seamless steel pipe and its preparation method. The prepared seamless steel pipe has excellent high-temperature resistance and mechanical strength, and also has good oxidation resistance and corrosion resistance. performance, the production and preparation process is simple, suitable for large-scale production, and solves the problems of poor high temperature resistance and mechanical strength of seamless steel and complex preparation process in the prior art

Method used

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  • High-temperature-resistant seamless steel pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The chemical composition and mass percentage of the high temperature resistant seamless steel pipe provided in this example are:

[0019] C: 0.12%, Mn: 0.5%, Si: 0.5%, Cr: 8%, Ni: 22%, Ti: 0.05%, V: 0.02%, Cu: 0.05%, W: 0.18%, Pt: 0.005%, Mo: 0.05%, Os: 0.002%, Nb: 0.005%, Re: 0.005%, Zr: 0.005%, Ta: 0.015%, P: 0.02%, S: 0.005%, and the balance is Fe and unavoidable impurities.

[0020] The specific steps for preparing the above-mentioned high-temperature resistant seamless steel pipe are as follows:

[0021] (1) After the molten iron is pretreated, it is smelted in a converter, alloy components are added, and refining agent is added for refining outside the furnace, and argon is filled during the refining process; then it is vacuum degassed, the vacuum degree is ≤0.1Kpa, and the degassing time is 20 minutes; and then Carry out round tube billet continuous casting, cooling and annealing treatment.

[0022] (2) The obtained round billet is heated by a ring furnace and ...

Embodiment 2

[0025] The chemical composition and mass percentage of the high temperature resistant seamless steel pipe provided in this example are:

[0026] C: 0.15%, Mn: 0.5%, Si: 0.8%, Cr: 10%, Ni: 25%, Ti: 0.08%, V: 0.03%, Cu: 0.1%, W: 0.2%, Pt: 0.008%, Mo: 0.08%, Os: 0.006%, Nb: 0.01%, Re: 0.01%, Zr: 0.01%, Ta: 0.015%, P: 0.005%, S: 0.002%, and the balance is Fe and unavoidable impurities.

[0027] The specific steps for preparing the above-mentioned high-temperature resistant seamless steel pipe are as follows:

[0028] (1) After the molten iron is pretreated, it is smelted in a converter, alloy components are added, refining agent is added and refined outside the furnace, and argon is filled during the refining process; then it is vacuum degassed, the vacuum degree is ≤0.1Kpa, and the degassing time is 30 minutes; and then Carry out round tube billet continuous casting, cooling and annealing treatment.

[0029] (2) The obtained round billet is heated by a ring furnace and then pie...

Embodiment 3

[0032] The chemical composition and mass percentage of the high temperature resistant seamless steel pipe provided in this example are:

[0033] C: 0.18%, Mn: 0.6%, Si: 1%, Cr: 12%, Ni: 28%, Ti: 0.12%, V: 0.04%, Cu: 0.15%, W: 0.23%, Pt: 0.012%, Mo: 0.1%, Os: 0.01%, Nb: 0.02%, Re: 0.015%, Zr: 0.015%, Ta: 0.018%, P: 0.01%, S: 0.005%, and the balance is Fe and unavoidable impurities.

[0034] The specific steps for preparing the above-mentioned high-temperature resistant seamless steel pipe are as follows:

[0035] (1) After the molten iron is pretreated, it is smelted in a converter, alloy components are added, refining agent is added to refine it outside the furnace, and argon is filled during the refining process; then it is vacuum degassed, the vacuum degree is ≤0.1Kpa, and the degassing time is 40 minutes; Carry out round tube billet continuous casting, cooling and annealing treatment.

[0036] (2) The obtained round billet is heated by a ring furnace and then pierced to obt...

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Abstract

The invention relates to the technical field of steel pipes, in particular to a high-temperature-resistant seamless steel pipe and a preparation method thereof. The high-temperature-resistant seamless steel pipe comprises the chemical components in percentage by mass: 0.12%-0.22% of C, 0.5%-0.8% of Mn, 0.5%-1.5% of Si, 8%-12% of Cr, 22%-30% of Ni, 0.05%-0.15% of Ti, 0.02%-0.05% of V, 0.05%-0.2% of Cu, 0.18%-0.25% of W, 0.005%-0.02% of Pt, 0.05%-0.1% of Mo, 0.002%-0.01% of Os, 0.005%-0.05% of Nb, 0.005%-0.02% of Re, 0.005%-0.02% of Zr, 0.015%-0.02% of Ta, smaller than or equal to 0.02% of P, smaller than or equal to 0.005% of S and the balance of Fe and inevitable impurities. The seamless steel pipe prepared by the method is excellent in high-temperature resistance and mechanical strength, also has better oxidation resistance and corrosion resistance, the method is simple in production and preparation process and suitable for large-scale production, and the problems of poor high-temperature resistance and mechanical strength and complex preparation process of seamless steel in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of steel pipes, in particular to a high-temperature resistant seamless steel pipe and a preparation method thereof. Background technique [0002] Steel pipe can not only be used to transport fluid and powdery solids, exchange heat, manufacture mechanical parts and containers, it is also an economical steel, widely used in ventilation and heating equipment, engineering structures, thermal equipment, petrochemical, machinery manufacturing, geological drilling , high voltage equipment, national defense and aerospace and many other fields. With the continuous advancement of power production technology and the continuous improvement of people's living standards, the quality requirements for steel pipes are also getting higher and higher. Not only are they required to have higher strength, hardness, corrosion resistance, wear resistance, high temperature resistance, Bending and impact resistance, but also need to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D8/10C22C33/04
CPCC22C38/02C22C38/04C22C38/50C22C38/46C22C38/42C22C38/44C22C38/48C22C38/002C22C33/04C21D8/105
Inventor 张义山张仁杰
Owner 无锡恒丰祥钢管科技有限公司
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