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316L stainless steel and preparation method thereof

A technology of stainless steel and tons of steel, which is applied in the field of preparation of 316L stainless steel, can solve the problems of stainless steel plasticity decline, cracks, increase, etc., and achieve the effect of improving high temperature plasticity and calendering performance, low alkalinity, and ensuring desulfurization effect

Active Publication Date: 2021-02-09
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the sulfur content in steel is high, sulfide inclusions such as MnS and NiS also increase, which reduces the plasticity of stainless steel at the inclusions, resulting in cracks during rolling.

Method used

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  • 316L stainless steel and preparation method thereof
  • 316L stainless steel and preparation method thereof
  • 316L stainless steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] This embodiment provides a kind of 316L stainless steel, which is prepared through the following steps, and the specific process is as follows figure 1 Shown:

[0034] The temperature of the EAF soup (EAF raw materials are generally waste stainless steel, ferrochrome, nickel cold wash, lime) is 1540°C. After the molten soup is loaded into the transfer ladle, it enters the slag removal station for slag removal. After the slag removal is complete, the molten soup is loaded into the AOD refining furnace body.

[0035] After the start of AOD refining, pre-desulfurization treatment is carried out first, fluorite: 4kg / ton of steel is added in sequence, lime is added in batches of 3 times: a total of 20kg / ton of steel, silicon carbide: 5kg / ton of steel, bottom blowing and stirring for 20 minutes, pre- After the desulfurization is completed, S≤500ppm, reduce the desulfurization pressure in the later stage of AOD.

[0036] After the AOD pre-desulfurization treatment, oxygen bl...

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Abstract

The invention provides 316L stainless steel and a preparation method thereof. The preparation method comprises the steps that EAF coarse smelting is conducted on on a mixed material of 316L stainlesssteel; AOD pre-desulfurization is conducted on the mixed material subjected to EAF coarse smelting; AOD refining is conducted on the mixed material subjected to AOD pre-desulfurization; LT slagging-off treatment is conducted on the mixed material subjected to AOD refining; VOD vacuum desulfurization is conducted on the mixed material subjected to LT slagging-off treatment; and continuous casting is conducted on the mixed material subjected to VOD vacuum desulfurization to obtain the 316L stainless steel. The 316L stainless steel prepared through the method can effectively overcome the line scale defect of the edge portion of a cold (hot) rolled plate.

Description

technical field [0001] The invention relates to a method for preparing stainless steel, in particular to a method for preparing 316L stainless steel, and belongs to the technical field of metallurgy. Background technique [0002] 316L stainless steel is a stainless steel with higher corrosion resistance developed on the basis of 304 stainless steel. It is widely used in pressure vessels, transportation, technical products, machinery manufacturing, decoration, welded pipes and other fields. Therefore, the surface quality requirements of 316L stainless steel cold-rolled plates higher. [0003] Edge line scale defects are a type of surface defects with a higher probability of occurrence in cold-rolled sheets, and they also occur more frequently on the surface of hot-rolled sheets, which have a greater impact on product quality and genuine product rate. The content of S in the continuous casting slab has a great correlation with the line scale defects on the surface of the cold...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C1/02C21C7/064C21C7/10C22C38/02C22C38/04C22C38/44C22C38/58
CPCC22C33/06C22C38/02C22C38/04C22C38/58C22C38/002C22C38/44C21C7/064C21C1/02C21C7/10
Inventor 崔宏亮高磊袁震刘杰
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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