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Manufacturing method of antioxidant high-strength duplex stainless steel pipe

A technology of duplex stainless steel and a manufacturing method, applied in the field of stainless steel pipe processing, can solve the problems of resistance to sales and promotion of stainless steel pipes, narrow the application range of stainless steel pipes, shorten the service life of stainless steel pipes, etc. The effect of improving antioxidant strength

Pending Publication Date: 2022-05-27
NANJING WORLD SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After retrieval, Chinese Patent No. CN201810788186.X discloses a duplex stainless steel pipe and its manufacturing method. Although the target yield strength is achieved and the overall manufacturing efficiency is improved, the degree of oxidation resistance is low, thus shortening the service life of the stainless steel pipe, and The strength of general stainless steel pipes is low, which limits the use of stainless steel pipes, thereby reducing the application range of stainless steel pipes, bringing resistance to the sales and promotion of the stainless steel pipes, and bringing the problem of defects in the production method

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  • Manufacturing method of antioxidant high-strength duplex stainless steel pipe

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Embodiment 1

[0026] see figure 1 , the present invention provides a technical solution: a method for manufacturing an anti-oxidation high-strength duplex stainless steel tube, the method for manufacturing a high-strength duplex stainless steel tube with oxidation resistance includes the following preparation steps: manufacturing an ingot or billet of duplex stainless steel - a forging ingot Raw material or blank - making tube blank - heat treatment - straightening - inspection - packaging and storage, the chemical composition and mass percentage of this anti-oxidation high-strength duplex stainless steel tube are: C: 0.03%, Mn: 1.7%, Si: 0.6% , P: 0.01%, S: 0.022%, Cr: 16.0%, Ni: 4.0%, Mo: 3.0%, N: 0.1%, the balance is Fe and inevitable impurity elements;

[0027] The process of manufacturing duplex stainless steel ingots or billets: place the metal iron in an electric arc furnace, melt it to obtain blast furnace molten iron, put the alloy into an intermediate frequency furnace to obtain a...

Embodiment 2

[0034] see figure 1 , The present invention provides a technical solution: a method for manufacturing an anti-oxidation high-strength duplex stainless steel tube, the method for manufacturing an anti-oxidative high-strength duplex stainless steel tube includes the following preparation steps: manufacturing an ingot or billet of duplex stainless steel - a forging ingot Raw material or blank - manufacturing tube blank - heat treatment - straightening - inspection - packaging and storage, the chemical composition and mass percentage of the oxidation-resistant high-strength duplex stainless steel tube are: C: 0.04%, Mn: 1.8%, Si: 0.8% , P: 0.02%, S: 0.026%, Cr: 19.0%, Ni: 5.0%, Mo: 4.0%, N: 0.12%, the balance is Fe and inevitable impurity elements;

[0035]The process of manufacturing duplex stainless steel ingots or billets: place the metal iron in an electric arc furnace, melt it to obtain blast furnace molten iron, put the alloy into an intermediate frequency furnace to obtain ...

Embodiment 3

[0042] see figure 1 , the present invention provides a technical solution: a method for manufacturing an anti-oxidation high-strength duplex stainless steel tube, the method for manufacturing a high-strength duplex stainless steel tube with oxidation resistance includes the following preparation steps: manufacturing an ingot or billet of duplex stainless steel - a forging ingot Raw material or blank - making tube blank - heat treatment - straightening - inspection - packaging and storage, the chemical composition and mass percentage of the oxidation-resistant high-strength duplex stainless steel tube are: C: 0.06%, Mn: 2.0%, Si: 0.9% , P: 0.03%, S: 0.030%, Cr: 23.0%, Ni: 7.0%, Mo: 5.0%, N: 0.14%, the balance is Fe and inevitable impurity elements;

[0043] The process of manufacturing duplex stainless steel ingots or billets: place the metal iron in an electric arc furnace, melt it to obtain blast furnace molten iron, put the alloy into an intermediate frequency furnace to obt...

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Abstract

The invention discloses a manufacturing method of an anti-oxidation high-strength duplex stainless steel pipe, and belongs to the technical field of stainless steel pipe machining. The manufacturing method of the antioxidant high-strength duplex stainless steel pipe comprises the following manufacturing procedures of manufacturing an ingot material or a blank material of duplex stainless steel, forging the ingot material or the blank material, manufacturing a pipe blank, performing heat treatment, straightening, inspecting, packaging and warehousing, and the procedure of manufacturing the ingot material or the blank material of the duplex stainless steel comprises the steps of putting metal iron into an electric arc furnace; according to the method, the oxidation resistance of the stainless steel pipe can be effectively improved, so that the service life of the stainless steel pipe can be fully prolonged, the use cost of a user is greatly reduced, the strength and toughness of the stainless steel pipe can be improved, and the service life of the stainless steel pipe is prolonged. The use limitation of the stainless steel pipe is avoided, and the application range of the stainless steel pipe is expanded, so that the stainless steel pipe is easy to sell and popularize.

Description

technical field [0001] The invention relates to the technical field of stainless steel pipe processing, in particular to a method for manufacturing an oxidation-resistant high-strength duplex stainless steel pipe. Background technique [0002] Duplex stainless steel pipe has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is neither like the welding heat affected zone of ferritic stainless steel. Unlike austenitic stainless steel, it is more sensitive to welding hot cracks, so it is widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines and papermaking machinery, and has good development prospects. [0003] After retrieval, Chinese Patent No. CN201810788186.X discloses duplex stainless steel pipe and its manufacturing method. Although the target yield strength is achieved and the overall manufacturing efficiency is improved, the degree of oxidation resistance is low, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C22C38/02C22C38/58C22C38/44C22C33/06B22D1/00C21D8/10C21D1/18B21J1/02B21J1/06B21J5/00
CPCB21C37/06C22C38/02C22C38/58C22C38/44C22C38/001C22C33/06B22D1/00C21D8/105C21D1/18B21J5/002B21J1/02B21J1/06C21D2211/005C21D2211/001Y02P10/20
Inventor 王爵樑严加琦魏素辉袁梅芳
Owner NANJING WORLD SPECIAL STEEL
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