CN102041351A

CN102041351A - Slag conditioning method for refining chromium-nickel austenite stainless steel with argon-oxygen furnace

Info

Publication number: CN102041351A
Application number: CN 201010537083
Authority: CN
Inventors: 王贵平; 范光伟; 刘春来; 李志斌; 张继猛
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2010-11-07
Filing date: 2010-11-07
Publication date: 2011-05-04
Anticipated expiration: 2030-11-07
Also published as: CN102041351B

Abstract

The invention discloses a slag conditioning method for refining chromium-nickel austenite stainless steel with an argon-oxygen furnace, which belongs to the technical field of alloy steel refining. The method is characterized by providing a slag conditioning agent containing 35-50% of Al, 14-23% of Ca and 28-45% of Si. The slag conditioning agent is refined by the following steps: (1) removing over 80% of the reducing slag in the argon-oxygen furnace, and leaving 25-40 kg of slag per ton of steel in the furnace; (2) adding 0.5-2 kg of the slag conditioning agent per ton of steel into the furnace; and (3) adding 4-8 kg of lime and 1.5-3 kg of fluorite per ton of steel into the furnace; meanwhile, blowing argon into the furnace through a side blowing port and stirring; refining for 4-8 minutes; and controlling the slag alkalinity to 2.0-2.8. The method has the advantages that the total oxygen content in the obtained steel is reduced by over 20 ppm, and the sulphur content is reduced by over 30 ppm.

Description

A kind of residue adjustment method of argon oxygen stove refining Chromiumnickel Austenite Stainless Steel

Technical field:

The invention belongs to refined alloy steel technical field, be specifically related to a kind of residue adjustment method of argon oxygen stove refining Chromiumnickel Austenite Stainless Steel.

Technical background:

Development along with economy and technology, in the society stainless application quantity is enlarged year by year, stainless purity is required also constantly improving, products such as particularly ornamental cold rolled sheet, tubing and wire rod, also more and more stricter to the requirement of oxide compound in the steel and sulfide inclusion thing content.

In stainless steel is produced, argon oxygen stove is that the AOD stove is one of topmost refining unit, contain the easy oxidation elemental chromium more than 17% in the austenitic stainless steel, the deoxidation difficulty, the reductive agent consumption is very big, simultaneously, and when argon oxygen stove is smelted chromium nickel stainless steel, the general ferrosilicon that adopts is made reductive agent, and the reduction quantity of slag that causes is bigger.

At present, both at home and abroad when adopting argon oxygen stove to smelt chromium nickel stainless steel, the normal method that adopts has the slag of raising degree, suitably improves silicone content in the steel, increase the quantity of slag, suitably reduce reduction temperature etc., be that the ladle furnace that partial desulfurization task with argon oxygen stove has moved on to after the tapping of argon oxygen stove is that the LF stove goes to finish in addition, but the amplitude of the reduction of argon oxygen stove reduction temperature is limited.Above-mentioned the whole bag of tricks all can make the ton slag amount of argon oxygen stove increase, and is so both uneconomical, also do not meet environmental protection requirement.

Summary of the invention:

The object of the invention provides a kind of not increasing under ton situation of slag amount, the whole oxygen amount in the tapping of reduction AOD stove and the refining treatment method of sulphur content.

The present invention is achieved in that provides a kind of new slag supplying agent, its component than for contain Al35%～50%, contain Ca14%～23%, contain Si28%～45%.Concrete operation method is:

Kilogram; (optimum range be stay the quantity of slag in the stove be that steel per ton stays slag (30～40) kilogram)

2. in stove, add above-mentioned slag supplying agent (0.5～2) kilogram by molten steel per ton on the top of the slag; (optimum range is to add above-mentioned slag supplying agent (0.6～1.6) kilogram by molten steel per ton on the top of the slag in stove)

3. shake positive shaft, in stove, add lime steel per ton (4～8) kilogram, (optimum range is to add lime steel per ton (6～8) kilogram in stove), fluorite steel per ton (1.5～3) kilogram, (optimum range is fluorite steel per ton (2～a 3) kilogram), basicity of slag reaches 2.0～2.8 in the control stove, simultaneously, in stove, continue to be blown into argon gas in the side-blown air port, and stir, refining (4～8) minute.

Advantage of the present invention and positively effect are that the entire oxygen content in the steel amount after argon oxygen stove is tapped is on average reduced more than the 20ppm, and sulphur content on average reduces more than the 30ppm.

Embodiment:

1. producing the AISI304L austenitic stainless steel with argon oxygen stove refining furnace is example for 45 tons.

Provide slag supplying agent for containing Al40%, contain Ca18%, containing Si38%.

Working method is:

1. the total quantity of slag after the reduction of argon oxygen stove is 6.9 tons, takes 80% off, and the residue quantity of slag is 1.38 tons in the stove;

2. in stove, add 50 kilograms of slag supplying agents on the top of the slag;

3. shake positive shaft, in stove, add 300 kilograms in lime, 100 kilograms in fluorite, simultaneously, in stove, be blown into argon gas from the side-blown air port, and stir from high hopper, refining 6 minutes, the control basicity of slag reaches 2.4 tappings.

The result compares:

	Whole oxygen amount (ppm)	Sulphur content (ppm)	Total quantity of slag (ton)
				Existing method	77	65	7.5
The inventive method	56	33	7.3

2. producing the AISI316L austenitic stainless steel with argon oxygen decarburizing furnace is example for 45 tons.

Provide slag supplying agent for containing Al50%, contain Ca15%, containing Si32%.

Working method is:

1. the total quantity of slag after the reduction of argon oxygen stove is 7.2 tons, claws more than 80%, and the residue quantity of slag is 1.44 tons in the stove;

2. adding slag supplying agent on the top of the slag in stove is 60 kilograms;

3. shake positive shaft, add 300 kilograms in lime, 100 kilograms in fluorite in stove, simultaneously, be blown into argon gas from the side-blown air port in stove, and stir, continue refining 4 minutes, the control basicity of slag reaches 2.4 tappings.

The result compares:

	Whole oxygen amount (ppm)	Sulphur content (ppm)	Total quantity of slag (ton)
				Existing method	83	58	8.0
The inventive method	55	24	7.6

Claims

1. the residue adjustment method of an argon oxygen stove refining Chromiumnickel Austenite Stainless Steel, it is characterized in that providing a kind of Al35% of containing～50%, contain Ca14%～23%, contain the slag supplying agent of Si28%～45%, carry out refining, working method is: 1. the reducing slag in the argon oxygen stove is taken off more than 80%, stayed the quantity of slag to be controlled at steel per ton in the stove and stay slag (25～40) kilogram; 2. in stove, add slag supplying agent (0.5～2) kilogram by molten steel per ton on the top of the slag; 3. shake positive shaft and in stove, add lime steel per ton (4～8) kilogram, fluorite steel per ton (1.5～3) kilogram, basicity of slag reaches 2.0～2.8 in the control stove, simultaneously, continues to be blown into argon gas in the side-blown air port in stove, and stir refining (4～8) minute tapping.