Superaustenitic stainless steel and preparing method thereof

A kind of austenitic stainless steel, super technology, applied in the field of super austenitic stainless steel and its preparation, can solve the problems that the continuous casting slab production process has yet to be developed

Active Publication Date: 2017-08-18
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] my country needs to import this type of steel plate from abroad in batches. According to the previous market research, the domestic product is mainly round steel, and Consteel electric furnace plus intermediate frequency furnace is used to smelt super austenitic stainless steel mother liquor → AOD → LF → continuous casting The slab production process is yet to be developed

Method used

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  • Superaustenitic stainless steel and preparing method thereof

Examples

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preparation example Construction

[0037] A preparation method of super austenitic stainless steel, the steps are as follows:

[0038] (1), Consteel electric furnace and intermediate frequency furnace together smelt super austenitic stainless steel mother liquor;

[0039] The composition of Consteel electric furnace mother liquor is as follows according to weight percentage: C>0.5%, Si≤1.0%, Cr: 1-5%, Ni: 25-35%, P<0.007%, and the balance is Fe; the tapping temperature is controlled at 1490 ~1550°C; Consteel electric furnace mother liquor can be made of stainless steel waste, high-quality scrap steel, and ferronickel. Before smelting, the raw materials can be preheated to 500-600°C to reduce smelting costs. During the smelting process, oxygen can be blown and lime and white clouds can be added appropriately. The proportion of stone and adding appropriate calcium fluoride slag to reduce the content of P.

[0040] The intermediate frequency furnace is used to smelt ferrochromium and ferromolybdenum alloys. The c...

Embodiment example 1

[0045] The implementation examples are described below.

[0046] The composition of Consteel electric furnace mother liquor is as follows according to weight percentage: C: 1.39%, Si: 0.08%, P: 0.005%, Cr: 1.25%, Ni: 28.9%, the balance is Fe, and the tapping temperature is controlled at 1510°C. Through oxygen blowing decarburization in AOD furnace, nitrogen blowing and composition adjustment, LF furnace refining and microalloy addition, the composition of molten iron is finally adjusted to: C: 0.015%, Cr: 20.1%, Si: 0.55%, Ni: 25.4% , Mn: 1.35%, Mo: 4.2%, N: 0.056%, P: 0.018%, O: 0.0035%, S: 0.0075%, Al: 0.003%, Ca: 0.015%, B: 0.018%, Cu: 1.31% , the balance being Fe. The tapping temperature of the AOD furnace is 1510°C, the weak blowing time of the LF furnace is 32min, the feeding SiCa line is 380m, the B line is 22m, the hanging ladle temperature is 1450°C, the continuous casting tundish temperature is controlled at 1425°C, the penetration nozzle depth is 125mm, and the con...

Embodiment example 2

[0048] The implementation examples are described below.

[0049] The composition of Consteel electric furnace mother liquor is as follows according to weight percentage: C: 1.41%, Si: 0.06%, P: 0.006%, Cr: 1.15%, Ni: 28.5%, the balance is Fe, and the tapping temperature is controlled at 1505°C. Through oxygen blowing decarburization in AOD furnace, nitrogen blowing and composition adjustment, LF furnace refining and microalloy addition, the composition of molten iron is finally adjusted according to weight percentage: C: 0.014%, Cr: 20.8%, Si: 0.45, Ni: 25.6%, Mn: 1.25%, Mo: 4.15%, N: 0.046%, P: 0.017%, O: 0.0036%, S: 0.0065%, Al: 0.0032%, Ca: 0.018%, B: 0.022%, Cu: 1.35%, The balance is Fe. AOD tapping temperature is 1515°C, LF furnace weak blowing time is 35min, feeding SiCa line is 400m, B line is 25m, hanging ladle temperature is 1445°C, continuous casting tundish temperature is controlled at 1426°C, penetration nozzle depth is 125mm, continuous casting speed is 0.85m / mi...

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Abstract

The invention provides superaustenitic stainless steel and a preparing method thereof. The superaustenitic stainless steel is prepared in the following percent by weight: smaller than or equal to 0.020% of C, smaller than or equal to 1.00% of Si, smaller than or equal to 2.00% of Mn, smaller than or equal to 0.045% of P, smaller than or equal to 0.035% of S, smaller than or equal to 0.1% of N, 19.0-23.0% of Cr, 1.2-2.0% of Cu, 4.0-5.0% of Mo, 23.0-28.0% of Ni, smaller than or equal to 0.0050% of O, smaller than or equal to 0.010% of Al, smaller than or equal to 0.020% of Ca, smaller than or equal to 0.030% of B and the balance of Fe. The method adopts a protection process of smelting superaustenitic stainless steel mother liquid by adopting a Consteel electric furnace and an intermediate frequency furnace, AOD, LF and continuous casting of a sheet billet, and can smelt the high-Ni, high-Cr, high-Mo, Cu-containing and low-C superaustenitic stainless steel, and both the surface quality and internal quality of the continuous casting billet are good.

Description

technical field [0001] The invention relates to a super austenitic stainless steel and a preparation method thereof. Background technique [0002] High nickel, high molybdenum, containing copper, nitrogen, and the base metal microstructure is a typical 100% austenite stainless steel called super austenitic stainless steel, such as the Chinese patent application number 200580047196.9. [0003] Because super austenitic stainless steel has high chromium, nickel, molybdenum content and low carbon content, and at the same time, in order to improve its hot processing plasticity in the future, the content of phosphorus and sulfur is extremely low, so it is relatively difficult to melt, and it has segregation and cracking. Disadvantages, so super austenitic stainless steel is the most demanding and difficult variety in stainless steel production technology, and it is the concentrated expression of steel factory technology. [0004] my country needs to import this type of steel plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/42C22C38/58C22C38/54C22C38/02C22C38/04C22C38/06C22C33/04C22C30/02B22D11/00
Inventor 杨振颜海涛申鹏杨赛朱叶伟刘晓亚孙广申金军丁以林
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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