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Manufacturing method of oversized continuous casting slab of nickel stainless steel

A manufacturing method and super-large-scale technology, applied in the field of metal material stainless steel smelting technology, can solve the problems of undetected continuous casting large round billets and blooms, super large cross-section nickel stainless continuous casting billets, difficulty in production, complex process parameters, etc.

Active Publication Date: 2016-08-17
DONGBEI SPECIAL STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of nickel stainless continuous casting slabs with super large cross-sections is difficult, and the process parameters are complicated. The casting of blooms and blooms also belongs to the blank field, and no relevant valuable information on continuous casting blooms and blooms, and related research work have been found in domestic and foreign literature searches

Method used

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  • Manufacturing method of oversized continuous casting slab of nickel stainless steel
  • Manufacturing method of oversized continuous casting slab of nickel stainless steel
  • Manufacturing method of oversized continuous casting slab of nickel stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Steel type: 022Cr19Ni10 (304L)

[0065] Furnace number: 15113052909, continuous casting slab finished product specification: Φ600mm.

[0066] Process flow: UHP→AOD→ (VD)→LF→continuous casting→finishing→packaging.

[0067] 1. Steelmaking process

[0068] (1) The actual chemical composition of 022Cr19Ni10 (304L) steel, see Table 10,

[0069] Table 10 Chemical composition of 022Cr19Ni10 (304L) steel

[0070]

[0071] ⑵Electric furnace process

[0072] Furnace loading capacity is 55 tons, and the furnace materials are selected from high-quality 300 series returned scrap steel, high-carbon ferrochrome, and nickel-containing pig iron. Among them, the amount of 300 series returned scrap steel is 35 tons, the amount of nickel-containing pig iron is 10 tons, and high-carbon ferrochrome is 8 tons; Tapping temperature (T): 1630°C, part of the high-carbon alloy material is used to adjust the composition when tapping; eccentric bottom tapping, slag tapping cannot be controlle...

Embodiment 2

[0100] Steel type: 022Cr17Ni12Mo2 (316L)

[0101] Furnace number: 15116012920; Specifications of the finished billet: 380*490mm.

[0102] Process flow: UHP→AOD→ (VD)→LF→continuous casting→finishing→packaging.

[0103] 1. Steelmaking process

[0104] (1) The actual chemical composition of 022Cr17Ni12Mo2 (316L) steel, see Table 14,

[0105] Table 14 Chemical composition of 022Cr17Ni12Mo2 (316L) steel

[0106]

[0107] ⑵ Electric furnace process

[0108] Furnace loading capacity is 53 tons, and the charge is selected from high-quality 300 series returned scrap steel, high-carbon ferrochrome, and nickel-containing pig iron. Among them, the amount of 300 series returned scrap steel is 40 tons, the amount of nickel-containing pig iron is 10 tons, and the amount of high-carbon ferrochrome is 5 tons; Tapping temperature (T): 1620°C, part of the high-carbon alloy material is used to adjust the composition when tapping; eccentricity is low for tapping, and slag tapping cannot be ...

Embodiment 3

[0137] Steel type: 06Cr19Ni10 (304)

[0138] Furnace number: 16114050446, continuous casting slab finished product specification: Φ600mm.

[0139] Process flow: UHP→AOD→ (VD)→LF→continuous casting→finishing→packaging;

[0140]1. Steelmaking process

[0141] ⑴ The actual chemical composition of 06Cr19Ni10 (304) steel is shown in Table 18.

[0142] Table 18 Chemical composition of 304 steel

[0143]

[0144] ⑵Electric furnace process

[0145] Furnace loading capacity is 54 tons, and the furnace materials are high-quality 300 series returned scrap steel, high-carbon ferrochrome, and nickel-containing pig iron, of which 35 tons of 300-series returned scrap steel, 10 tons of nickel-containing pig iron, and 9 tons of high-carbon ferrochrome are used; Tapping temperature (T): 1630°C, part of the high-carbon alloy material is used to adjust the composition when tapping; eccentric bottom tapping, slag tapping cannot be controlled; 5 minutes before tapping, reduce the oxygen inte...

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Abstract

The invention discloses a manufacturing method of an oversized continuous casting slab of nickel stainless steel and aims to achieve the purpose of improving surface and inner quality of the continuous casting slab. To achieve the purpose, two key technical measures are taken, on one hand, reasonable chemical ingredient design is conducted, a scientific and reasonable smelting process is formulated, and it is guaranteed that the nitrogen / oxygen content in steel is lowered, and oxide inclusion in steel is reduced; on the other hand, the reasonable continuous casting pouring temperature, the casting speed and secondary cooling water distribution parameters are determined, secondary oxidation is reduced in the pouring process, contamination of steel liquid is prevented, meanwhile a reasonable process is controlled, and segregation of chemical ingredients is reduced while the surface quality of the continuous casting slab is improved. Continuous casting production changes a process route that steelmaking, die casting and forging are mainly conducted of traditional large stainless steel forging products, blank in the production field both home and abroad is filled up, production efficiency is greatly improved, the yield is raised, and the production cost is lowered.

Description

technical field [0001] The invention belongs to the field of stainless steel smelting technology for metal materials, and discloses a method for manufacturing high-quality stainless steel super-sized continuous casting slabs (round billet specifications Φ600mm, Φ700mm, Φ800mm; square billet specifications 380mm×490mm), mainly used for the production of nickel stainless steel billets . Background technique [0002] At present, domestic nickel stainless steel super-large section billets are mostly produced by die casting billets, even if the continuous casting process is used, only continuous casting round billets below Φ600 mm and square billets below 350 mm can be produced. With the continuous increase in the amount and scale of ring forgings for gas turbines and wind power, there are higher and higher expectations for the cross-sectional size, variety and quality of continuous casting round billets. Compared with traditional steel ingots, the use of continuous casting larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/40C22C38/02C22C38/04C22C38/44C21C5/52C21C7/00C21C7/10B22D11/116B22D11/117B22D11/18
CPCB22D11/116B22D11/117B22D11/18C21C5/52C21C7/00C21C7/10C22C38/001C22C38/02C22C38/04C22C38/40C22C38/42C22C38/44Y02P10/20
Inventor 周一玲孙启斌陈长西李忠之吕学飞姜文宝于全功聂显飞杨庆敏崔金鹏窦毅民于岩吴鹏周伟基路辉马玉民蒋大伟袁洪岷胡永才
Owner DONGBEI SPECIAL STEEL GROUP
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