Soft austenitic stainless steel and preparation method thereof

A technology of austenitic stainless steel and molten steel, applied in the field of stainless steel, to achieve the effect of excellent corrosion resistance and good deep processing performance

Active Publication Date: 2012-07-11
BAOSTEEL DESHENG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its deep processing performance and corrosion resistance still need further improvement.

Method used

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  • Soft austenitic stainless steel and preparation method thereof

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Embodiment 1-4

[0036] According to the composition of the austenitic stainless steel according to the present invention, see Table 1. Electric furnace + AOD + LF is used for smelting, and the slagging is carried out after the reduction of the refining station. %; After secondary slagging, add 3-10Kg of 70% pure TiFe powder per ton of molten steel to the tapping ladle; add low-carbon synthetic slag for slag replacement after tapping, and add 70 % purity TiFe wire 40-250Kg, the Ti content is controlled at 0.10-0.25%, and after stirring, it is cast into a 200mm thick continuous casting slab, and the nitrogen content of the finished product after casting is controlled below 0.020%; after the continuous casting slab is heated and rolled Pickling to get 3-60mm thick plate;

[0037] For comparison, EAF+AOD+LF smelting is also carried out on the current general-purpose 304L (comparative example 1). Obviously, if its Md30 is obviously higher than the composition of the present invention, a furnace o...

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Abstract

The invention relates to a soft austenitic stainless steel which comprises the following components by weight: less than or equal to 0.025% of C, less than or equal to 0.020% of N, more than or equal to 6C of Ti, 10.00-12.00% of Ni, 18.00-19.00% of Cr, less than or equal to 2% of Mn, less than or equal to 0.40% of Si, less than or equal to 0.015% of S, less than or equal to 0.045% of P, and the balance of Fe and inevitable impurities. The high-temperature ferrite delta content of the austenitic stainless steel is less than 5%. The invention also relates to a preparation method of the soft austenitic stainless steel. The preparation method comprises the following steps of: skimming slags after completing the reduction at a refining station; after skimming slags, adding lime and fluorite in each ton of liquid steel, and performing slagging at least twice, with the N content being controlled within the range of 0.015-0.025%; after two slaggings, adding TiFe powder into each ton of liquid steel till tapping ladle; after tapping, adding low-carbon synthetic slag so as to perform a slag exchanging operation and further absorb TiN impurities; when the liquid steel reaches an LF (ladle furnace) refining furnace for refining, adding a certain quantity of TiFe wires, thereby causing Ti to be more than or equal to 6C; and casting after stirring, wherein the nitrogen content of an end product after being cast is less than or equal to 0.020%. The soft austenitic stainless steel provided by the invention is applied to the field with higher demand on forming property and corrosion resistance.

Description

technical field [0001] The invention relates to a stainless steel, in particular to a soft austenitic stainless steel and a preparation method thereof, which can effectively control the nitrogen content. The stainless steel has excellent formability and good corrosion resistance. In addition to replacing existing materials, it can also be used in fields that require high formability of materials, especially multi-pass forming. Background technique [0002] 18-8 series austenitic stainless steel, such as SUS304 and SUS304L, have good corrosion resistance, mechanical properties, formability and welding performance at high and low temperatures, and are widely used in chemical industry, energy, construction machinery, kitchen utensils, products, etc. each field. Because it is a metastable austenitic structure, martensite will be produced during processing and deformation, so that the strength can be improved by cold work hardening, which is also one of the advantages of this ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C21C7/076
CPCY02P10/20
Inventor 淮凯文庄伟刘尚潭陆斌罗明
Owner BAOSTEEL DESHENG STAINLESS STEEL
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