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Dual-phase steel tube for low-temperature pressure vessel and preparation method of dual-phase steel tube

A pressure vessel, dual-phase steel technology, applied in the field of pressure vessels

Inactive Publication Date: 2018-06-01
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the emergence of high-demand and high-performance equipment, the performance of duplex stainless steel still needs to be improved to meet the needs of the design, especially in terms of low temperature resistance and corrosion resistance

Method used

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  • Dual-phase steel tube for low-temperature pressure vessel and preparation method of dual-phase steel tube
  • Dual-phase steel tube for low-temperature pressure vessel and preparation method of dual-phase steel tube
  • Dual-phase steel tube for low-temperature pressure vessel and preparation method of dual-phase steel tube

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preparation example Construction

[0035] According to the second aspect of the present invention, the present invention provides a method for preparing the dual-phase steel pipe for low-temperature pressure vessels, the method comprising the following steps:

[0036] 1) Steel refining: smelting raw materials;

[0037] 2) Steel pipe forming: the pipe blank is manufactured by continuous casting or die casting, and then formed by rolling;

[0038] 3) Heat treatment: The delivery state of the formed steel pipe is solid solution.

[0039] Among them, the concept of solid solution is well known to those skilled in the art, specifically, solid solution is to heat steel and alloy to the temperature of single-phase solid solution and through sufficient heat preservation, so that certain components in steel and alloy dissolve into the matrix In the tissue, and form a uniform solid solution, and then rapidly cooled, so that the dissolved composition is preserved in the solid solution, this heat treatment is called solid...

Embodiment 1

[0047] This embodiment is used to illustrate the dual-phase steel pipe for low-temperature pressure vessel and its preparation method of the present invention.

[0048] 1) Steel refining: the raw materials are initially smelted in an electric arc furnace, and then refined outside the LF furnace;

[0049] 2) Steel pipe forming: the pipe blank is manufactured by continuous casting process, and then formed by hot rolling method to obtain a steel pipe with a specification of Φ325×15. The chemical composition of the steel pipe is shown in Table 1;

[0050] 3) Heat treatment: The delivery state of the formed steel pipe is solid solution, the solid solution temperature is 1075°C, and the cooling is accelerated by air cooling at a rate of 10°C / s.

Embodiment 2

[0052] This embodiment is used to illustrate the dual-phase steel pipe for low-temperature pressure vessel and its preparation method of the present invention.

[0053] The implementation mode is the same as that in Example 1, wherein the chemical composition of the prepared steel pipe is shown in Table 1, the solid solution temperature is 1105°C, and the cooling rate is 5°C / s.

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Abstract

The invention provides a dual-phase steel tube for a low-temperature pressure vessel and a preparation method of the dual-phase steel tube. In terms of the total weight of the steel tube, the steel tube is prepared from chemical components in percentage by weight as follows: smaller than or equal to 0.03% of C, smaller than or equal to 1.0% of Si, smaller than or equal to 1.0% of Mn, smaller thanor equal to 0.010% of S, smaller than or equal to 0.025% of P, 6.0%-8.5% of Ni, 24.0%-26.0% of Cr, 3.0%-4.0% of Mo, 0.5%-1.0% of W, 0.25%-0.35% of N, smaller than or equal to 1.0% of Cu, 0.005%-0.1% of Re and the balance of Fe and inevitable impurities; the content of each component is not 0. The dual-phase steel tube for the low-temperature pressure vessel has good room temperature mechanical performance, the impact absorption energy KV2 larger than or equal to 120 J at subzero 40 DEG C or below, good low temperature resistance, excellent alkali corrosion resistance and higher hardness.

Description

technical field [0001] The invention relates to the field of pressure vessels used in petrochemical and coal chemical industries, and in particular to a dual-phase steel pipe for low-temperature pressure vessels and a preparation method thereof. Background technique [0002] With the increasing number of domestic LNG projects and the increasing demand for clean energy, a large number of oil refining and coal chemical plants have also been launched. These devices sometimes encounter low temperature and high pressure conditions. With the enlargement of the device, the diameter of the pressure vessel and the pressure pipe are getting larger and larger, resulting in a corresponding increase in wall thickness. For some media, nickel-containing low-temperature low-alloy steel cannot be used, but stainless steel must be used. However, the allowable stress of 18-8 stainless steel is generally low at present, resulting in too thick wall thickness of pressure vessels and pressure pipe...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/42C22C38/04C22C38/02C22C38/50C22C38/52C21D8/10
CPCC22C38/44C21D8/105C22C38/001C22C38/005C22C38/02C22C38/04C22C38/42C22C38/50C22C38/52
Inventor 王金光
Owner SINOPEC ENG
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