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Middle-chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel and manufacturing method thereof

A manufacturing method, ferrite technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc.

Inactive Publication Date: 2008-03-26
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application number CN98801478 discloses a ferritic stainless steel plate with good deep drawing resistance and wrinkle-like deformation resistance and its manufacturing method. The content of main elements in stainless steel is limited. The content of Nb mainly limits the heating temperature of steel slab and the temperature range of hot rough rolling in the manufacturing method. The invention patent does not involve the addition of rare earths, and the effect on rare earth elements is not involved.
[0004] Chinese patent application number CN200610012416 discloses medium chromium copper-containing ferrite antibacterial anti-wrinkle stainless steel strip and its manufacturing method. The invention makes ordinary medium chromium ferrite by adding rare earth, Cu element and bell furnace annealing process of hot rolled strip Stainless steel has the function of antibacterial and anti-wrinkle, and does not involve high-purity ferritic stainless steel with poorer anti-wrinkle, and does not involve the continuous annealing process of hot-rolled strips and the addition of rare earth elements

Method used

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  • Middle-chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 1. Smelting and casting

[0073] The time between adding the rare earth alloy and casting steel is controlled to be 50 seconds, the casting temperature is controlled at 1560° C., and the ratio of equiaxed crystals in the solidification structure of the slab reaches 40% through the addition of the rare earth alloy.

[0074] 2. Ingot or slab opening

[0075] The ingot or slab can be forged or continuously cast and rolled. When forging is used, the heating temperature of the ingot or slab is 1100°C, the final forging temperature is 950°C, and it is slowly cooled.

[0076] 3. Hot rolling

[0077] The ingot or slab is heated to 1100°C after opening, and rolled into a hot-rolled strip with a thickness of 4.0mm. The final rolling temperature is 870°C and air-cooled.

[0078] 4. Annealing and pickling after hot rolling

[0079] The strip after hot rolling is pickled by continuous annealing, the annealing temperature is maintained at 1000°C, and the holding time is 2 minutes....

Embodiment 2

[0085] 1. Smelting and casting

[0086] The time between adding the rare earth alloy and casting steel is controlled to be 40 seconds, the casting temperature is controlled at 1550° C., and the ratio of equiaxed crystals in the solidification structure of the slab reaches 42% through the addition of the rare earth alloy.

[0087] 2. Ingot or slab opening

[0088] The ingot or slab can be forged or continuously cast and rolled. When forging is used, the heating temperature of the ingot or slab is 1080°C, the final forging temperature is 950°C, and it is slowly cooled.

[0089] 3. Hot rolling

[0090] The ingot or slab is heated to 1080°C after opening, and rolled into a hot-rolled strip with a thickness of 4.0mm. The final rolling temperature is 850°C and air-cooled.

[0091] 4. Annealing and pickling after hot rolling

[0092] The strip after hot rolling is pickled by continuous annealing, the annealing temperature is maintained at 1050°C, and the holding time is 1 minute. ...

Embodiment 3

[0098] 1. Smelting and casting

[0099] The time between adding the rare earth alloy and casting steel is controlled to be 30 seconds, the casting temperature is controlled at 1540° C., and the proportion of equiaxed crystals in the solidification structure of the slab reaches 43% through the addition of the rare earth alloy.

[0100] 2. Ingot or slab opening

[0101] The ingot or slab can be forged or continuously cast and rolled. When forging is used, the heating temperature of the ingot or slab is 1060°C, the final forging temperature is 950°C, and it is slowly cooled.

[0102] 3. Hot rolling

[0103] The ingot or slab is heated to 1060°C after opening, and rolled into a hot-rolled strip with a thickness of 4.0mm. The final rolling temperature is 850°C and air-cooled.

[0104] 4. Annealing and pickling after hot rolling

[0105] The strip after hot rolling is pickled by continuous annealing, the annealing temperature is kept at 970°C, and the holding time is 5 minutes. ...

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Abstract

The RE-containing medium Cr wrinkling resistant ferritic stainless steel has the chemical components including C not more than 0.02 wt%, N not more than 0.02 wt%, Si not more than 0.50 wt%, Mn not more than 0.50 wt%, P not more than 0.03 wt%, S not more than 0.02 wt%, Cr 16-20 wt%, Ni not more than 1.00 wt%, Mo not more than 2.00 wt%, Ti not more than 0.30 wt%, Nb not more than 0.40 wt%, O not more than 0.015 wt%, RE 0.01-0.20 wt%, and Fe and inevitable impurity for the rest. The ferritic stainless steel features low C and N contents, medium Cr content, containing RE, high wrinkling resistance, etc. It is suitable for punching formation to make product.

Description

technical field [0001] The invention belongs to the field of stainless steel products and its manufacture, and mainly relates to medium chromium-containing rare earth ferritic wrinkle-resistant stainless steel and a manufacturing method thereof. Background technique [0002] Ferritic stainless steel, especially high-purity or ultra-pure ferritic stainless steel with low C and N content is more and more popular, because it is different from traditional ferrite with high C and N content. Compared with solid stainless steel, the corrosion resistance and processing performance are greatly improved, and its comprehensive performance is no less than that of nickel-containing austenitic stainless steel in many applications. However, in the stamping products industry with thin thickness, high-purity or ultra-pure ferritic stainless steel with low C and N content, the wrinkling phenomenon after processing and forming is relatively serious, which affects the forming performance and ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/28C22C38/50C22C33/04B21B1/46B21B37/00B21J1/06B22D11/114B22D11/116C21D8/00C21D11/00
Inventor 徐军余海峰戚国平
Owner BAOSHAN IRON & STEEL CO LTD
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