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High-toughness and corrosion-resistant TWIP steel and preparation method thereof

A corrosion-resistant, high-strength technology, applied in coatings, metal material coating processes, hot-dip plating processes, etc., can solve problems such as insufficient corrosion resistance and engineering application limitations

Active Publication Date: 2021-08-20
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, due to the existence of a large amount of active Mn elements (15-30wt.%), the corrosion resistance of TWIP steel is insufficient, resulting in serious restrictions on its engineering application in some strong corrosive environments.

Method used

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  • High-toughness and corrosion-resistant TWIP steel and preparation method thereof
  • High-toughness and corrosion-resistant TWIP steel and preparation method thereof
  • High-toughness and corrosion-resistant TWIP steel and preparation method thereof

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preparation example Construction

[0029] Such as figure 1 Shown, a kind of preparation method of high-strength toughness, corrosion-resistant TWIP steel can comprise the following steps:

[0030] Step 1, pre-plating surface treatment: before hot-dip aluminum plating of TWIP steel, cold deformed TWIP steel (this cold deformed TWIP steel can adopt TWIP steel plate and / or TWIP steel wire through cold deformation treatment, for example: cold rolled TWIP steel Thin plate, cold-drawn TWIP steel wire) to degrease and derust the surface to obtain TWIP steel with a clean surface to ensure the integrity of the coating. The pre-plating surface treatment may specifically include the following operations:

[0031](1) Chemical degreasing: use the hot alkali solution method to remove surface oil stains on the cold deformed TWIP steel at a temperature of 80-90°C. The degreasing solution used in the hot alkali solution method is 80g / L NaOH, 30g / L Na 2 CO 3 , 30g / L Na 3 PO 4 and 8g / L Na 2 SiO 3 .

[0032] (2) Pickling:...

Embodiment 1

[0042] Such as figure 1 Shown, a kind of preparation method of high-strength toughness, corrosion-resistant TWIP steel is used for preparing high-strength toughness, corrosion-resistant Fe-30Mn-3Al-3Si TWIP steel sheet, specifically comprises the following steps:

[0043] Step a1, surface treatment before plating: degreasing and derusting the surface of the Fe-30Mn-3Al-3Si cold-rolled TWIP steel sheet with a thickness of 0.5mm to obtain a TWIP steel sheet with a clean surface. The pre-plating surface treatment specifically includes the following procedures:

[0044] (1) Chemical degreasing: use the hot alkali solution method at a temperature of 80°C to remove surface oil stains on the Fe-30Mn-3Al-3Si cold-rolled TWIP steel sheet with a thickness of 0.5mm. The solution is 80g / L NaOH, 30g / L Na 2 CO 3 , 30g / L Na 3 PO 4 and 8g / L Na 2 SiO 3 .

[0045] (2) pickling: the use of HCl and 3g / L urotropine (corrosion inhibitor) with a concentration of 25wt.% at a temperature of 30...

Embodiment 2

[0050] Such as figure 1 Shown, a kind of preparation method of high-strength toughness, corrosion-resistant TWIP steel is used for preparing high-strength toughness, corrosion-resistant Fe-30Mn-3Al-3Si TWIP steel wire, specifically comprises the following steps:

[0051] Step b1, surface treatment before plating: the Φ2.2mm Fe-30Mn-3Al-3Si cold-drawn TWIP steel wire is subjected to surface degreasing and rust removal treatment to obtain TWIP steel wire with a clean surface. The pre-plating surface treatment specifically includes the following procedures:

[0052] (1) Chemical degreasing: Use the hot alkali solution method to remove the surface oil stains on the Φ2.2mm Fe-30Mn-3Al-3Si cold drawn TWIP steel wire at a temperature of 80°C. The hot alkali solution method used for degreasing The solution is 80g / L NaOH, 30g / L Na 2 CO 3 , 30g / L Na 3 PO 4 and 8g / L Na 2 SiO 3 .

[0053] (2) pickling: the use of HCl and 3g / L urotropine (corrosion inhibitor) with a concentration o...

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Abstract

The invention discloses high-toughness and corrosion-resistant TWIP steel and a preparation method thereof. The preparation method comprises the steps that cold deformation TWIP steel is subjected to surface oil removal and rust removal treatment, and the TWIP steel with the clean surface is obtained; the TWIP steel with the clean surface is immersed in a plating assistant solution at the temperature of 70 to 85 DEG C for 1 to 2 min, then drying treatment is performed, and the drying temperature is 80 to 140 DEG C; and next, the dried TWIP steel is immersed in molten aluminum at the temperature of 700 to 800 DEG C for hot dipping, the hot dipping time is 0.5 to 2 min, and the leading-out speed of the TWIP steel from the molten aluminum is 1 to 5 m / min, so that the high-toughness and corrosion-resistant TWIP steel is obtained. According to the method, strengthening and toughening heat treatment of the TWIP steel and preparation of an aluminum metal corrosion-resistant protective layer can be synchronously achieved, so that the TWIP steel has the comprehensive performance of high toughness, corrosion resistance and the like, and the production efficiency of products such as TWIP steel high-performance thin plates and wires is greatly improved.

Description

technical field [0001] The invention relates to the field of TWIP (Twinning-induced plasticity, twinning-induced plasticity) steel, in particular to a high-strength, tough, corrosion-resistant TWIP steel and a preparation method thereof. Background technique [0002] Twinning-induced plasticity (Twinning-induced plasticity, TWIP) steel has high strength (tensile strength Rm: 550-1200MPa) and extremely high plasticity (elongation A: 60-110%), and the strong-plastic product is more than 50GPa·% , is a major breakthrough in the comprehensive properties of steel such as strength and ductility, and has extremely important application value in aerospace, vehicle engineering, rail transit, petrochemical and other fields. [0003] The high strength and toughness of TWIP steel originates from the formation of twins in austenite grains during its deformation process. Strain induces a large number of deformation twins, continuously divides and refines grains, hinders dislocation slipp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12C23C2/02C23C2/38C23C2/40
CPCC23C2/12C23C2/02C23C2/38C23C2/40Y02P10/20
Inventor 王幸福韩福生史子木赵莫迪梁驹华
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI