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A kind of low chromium and low nickel duplex stainless steel and preparation method thereof

A technology of duplex stainless steel and steel ingot, applied in the field of iron and steel materials, can solve the problems of poor thermoplasticity of duplex stainless steel, and achieve the effect of solving poor thermoplasticity, good weldability and cost reduction

Inactive Publication Date: 2021-02-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solved the problem of poor thermoplasticity of duplex stainless steel

Method used

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  • A kind of low chromium and low nickel duplex stainless steel and preparation method thereof
  • A kind of low chromium and low nickel duplex stainless steel and preparation method thereof
  • A kind of low chromium and low nickel duplex stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The low-chromium and low-nickel duplex stainless steel of this embodiment has the following composition by mass percentage: C 0.01%, Si 0.3%, Mn 10%, P≤0.01%, S≤0.01%, Al 0.5%, Cr15%, Ni 0.4 %, B 0.01%, the balance is Fe and unavoidable impurities, the equilibrium phase diagram of the duplex stainless steel is calculated by Thermo-Calc software as follows figure 1 shown.

[0040] The preparation method of the low-chromium and low-nickel duplex stainless steel comprises the following steps:

[0041] After comprehensive measurement and calculation and melting of ingredients, it is cast into steel ingots; the steel ingots are hot forged at 1120°C into 40mm thick forging billets, and cooled to room temperature in water; the forging billets are homogenized at 1250°C for 6 hours; the homogenized billets are Hot rolling at 1200°C, the final rolling temperature is 1050°C, ensuring that the single-pass reduction rate of hot rolling is not more than 30%, forming a hot-rolled she...

Embodiment 2

[0043] The low-chromium and low-nickel duplex stainless steel of this embodiment has the following composition by mass percentage: C 0.02%, Si 0.3%, Mn 10%, P≤0.01%, S≤0.01%, Al 0.8%, Cr19%, Ni 0.4 %, B 0.01%, the balance is Fe and unavoidable impurities, the equilibrium phase diagram of the duplex stainless steel is calculated by Thermo-Calc software as follows figure 2 shown.

[0044] The preparation method of the low-chromium and low-nickel duplex stainless steel comprises the following steps:

[0045] After comprehensive measurement and calculation and melting of ingredients, it is cast into steel ingot; the steel ingot is hot-forged at 1050°C to form a 60mm thick forging billet, and then water-cooled to room temperature; the forging billet is homogenized at 1200°C for 8 hours; Hot rolling at 1150°C, the final rolling temperature is 950°C, ensuring that the reduction rate of a single pass of hot rolling is not more than 30%, forming a hot-rolled sheet with a thickness of...

Embodiment 3

[0047] The low-chromium and low-nickel duplex stainless steel of this embodiment has the following composition by mass percentage: C 0.03%, Si 0.3%, Mn 8%, P≤0.01%, S≤0.01%, Al 1.1%, Cr16%, Ni 0.5 %, B 0.01%, the balance is Fe and unavoidable impurities, the equilibrium phase diagram of the duplex stainless steel is calculated by Thermo-Calc software as follows image 3 shown.

[0048] The preparation method of the low-chromium and low-nickel duplex stainless steel comprises the following steps:

[0049] After comprehensive measurement and calculation and melting of ingredients, it is cast into steel ingot; the steel ingot is hot-forged at 1070°C to form a 55mm thick forging billet, and water cooled to room temperature; the forging billet is homogenized at 1220°C for 7 hours; Hot rolling at 1180°C, the final rolling temperature is 1000°C, ensuring that the reduction rate of a single pass of hot rolling is not more than 30%, forming a hot-rolled sheet with a thickness of 4.2mm...

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Abstract

A low-chromium-low-nickel duplex stainless steel and a preparation method thereof of the present invention belong to the technical field of iron and steel materials. The steel includes components and mass percentages: C 0.01-0.2%, Si 0.3-0.8%, Mn 8-15%, P≤0.02%, S≤0.01%, Ni≤0.5%, Al 0.5-2%, Cr 12-19%, B 0.001-0.01%, and the balance is Fe and unavoidable impurities. The preparation process is as follows: smelt the raw materials according to the ratio, and cast them into steel ingots; after hot forging at 1050-1150°C into forging billets, cool to room temperature, and homogenize the forging billets at 1200-1250°C for 6-8 hours to homogenize The treated forged billet is hot rolled at 1150-1200°C, and the final rolling temperature is 950-1050°C. After cooling the hot-rolled sheet to room temperature, it is annealed at 780-1000°C for 5-10 minutes, and the annealed hot-rolled sheet is passed through After pickling, it is cold-rolled to produce low-chromium and low-nickel duplex stainless steel. The stainless steel has simple composition, low cost, excellent performance, yield strength ≥ 520MPa, tensile strength ≥ 850MPa, elongation ≥ 60%, and its weldability and corrosion resistance meet service requirements.

Description

Technical field: [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a low-chromium and low-nickel duplex stainless steel and a preparation method thereof. Background technique: [0002] Duplex stainless steel has a two-phase structure of ferrite and austenite, so its performance has the characteristics of both austenitic stainless steel and ferritic stainless steel, and has excellent comprehensive performance. Duplex stainless steel has been successfully and widely used in many fields such as petroleum, chemical industry, shipbuilding, papermaking, seawater desalination, transportation, nuclear power, bridges, and building curtain walls. However, due to the poor thermoplasticity of duplex stainless steel, hot forming is the key factor restricting its successful production, and the high cost of duplex stainless steel due to the shortage of nickel resources also directly restricts the development of the industry. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/54C22C38/06C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D2211/001C21D2211/005C22C38/002C22C38/02C22C38/06C22C38/54C22C38/58
Inventor 潘明明陈勇夏博张晓明苏祥斌
Owner NORTHEASTERN UNIV LIAONING
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