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High-carbon, sulfur-containing and easy-cutting type ferritic stainless steel and production method thereof

A production method and ferrite technology, which are applied to high-carbon sulfur-containing ferritic free-cutting stainless steel and its production field, can solve the problems of free-cutting stainless steel, surface scarring, low sulfur content, etc., and achieve good machinability and production. The effect of low cost and lower production cost

Inactive Publication Date: 2017-04-26
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ferritic free-cutting stainless steel with high carbon content is prone to production accidents such as splitting, piled steel and surface scarring in the existing production process
Publication No. CN105132812A provides a ferritic free-cutting stainless steel. The sulfur content of this steel is low. Although the production difficulty is small, the machinability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The present high-carbon and sulfur-containing ferritic free-cutting stainless steel is produced by the following method.

[0017] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, its composition by weight percentage is: C 0.112%, Mn 1.16%, Si 0.39%, P 0.025%, S 0.31%, Cr 17.19%, Ni 0.08 %, the rest is iron and unavoidable impurity elements, manganese-sulfur ratio Mn / S=3.74.

[0018] (2) Heating process: heat the billet in the heating furnace, the temperature in the preheating section is 830°C, the heating temperature is 1070°C, the soaking temperature is 1110°C, and the time in the furnace is 130min.

[0019] (3) Rolling process: The billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, and 8 passes of finish rolling. 900°C, sizing temperature 950°C, coiling temperature 950°C.

[0020] (4) Cooling process: the wire rod enters the cooling roller tabl...

Embodiment 2

[0022] Embodiment 2: The present high-carbon and sulfur-containing ferritic free-cutting stainless steel is produced by the following method.

[0023] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, its composition by weight percentage is: C 0.106%, Mn 1.10%, Si 0.34%, P 0.020%, S 0.30%, Cr 17.10%, Ni 0.06 , the rest are iron and unavoidable impurity elements, the ratio of manganese to sulfur is 3.67.

[0024] (2) Heating process: heat the billet in the heating furnace, the temperature in the preheating section is 800°C, the heating temperature is 1090°C, the soaking temperature is 1110°C, and the time in the furnace is 150min.

[0025] (3) Rolling process: the steel billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, and 8 passes of finish rolling, in which the head temperature of the steel billet is ≥1000°C when the billet passes through the first six rolling mills i...

Embodiment 3

[0028] Embodiment 3: The present high-carbon and sulfur-containing ferritic free-cutting stainless steel is produced by the following method.

[0029] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, its composition by weight percentage is: C 0.111%, Mn 1.15%, Si 0.37%, P 0.020%, S 0.28%, Cr 17.15%, Ni 0.06 %, the rest is iron and unavoidable impurity elements, the ratio of manganese to sulfur is 4.1.

[0030] (2) Heating process: heat the billet in the heating furnace, the temperature in the preheating section is 850°C, the heating temperature is 1085°C, the soaking temperature is 1130°C, and the time in the furnace is 140min.

[0031] (3) Rolling process: the billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, and 8 passes of finish rolling, in which the temperature at the head of the six racks in the rough rolling stage is ≥1040°C; the temperature of entering and fin...

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Abstract

The invention discloses high-carbon, sulfur-containing and easy-cutting type ferritic stainless steel and a production method thereof. The production method comprises a heating process, a rolling process and a cooling process; a steel billet used in the production method comprises the following chemical components in percentage by mass: 0.080-0.130% of C, not less than 0.50% and not greater than 1.25% of Mn, not greater than 1.00% of Si, not greater than 0.045% of P, not less than 0.15% and not greater than 0.35% of S, 15.00-20.00% of Cr, not greater than 0.60% of Ni, and the balance Fe and inevitable impurity elements, wherein the ratio of anganese to sulfur is not less than 3. Phi 5.5-38mm high-carbon and easy-cutting type ferritic stainless steel can be produced through the method, is high in yield and high in surface quality, and also has a good effect on controlling the shape of inclusions; the product of a ferritic structure; the grain size of the product is beyond grade 8; the hot rolling strength is 450 to 550MPa; the elongation percentage is 15-30%; and the reduction of area is 60-80%. With the adoption of the method, production accidents such as splitting and steel heaping in rolling can be effectively avoided; the yield is more than 97%; the percent of pass is beyond 95%. Therefore, the production cost can be greatly decreased.

Description

technical field [0001] The invention relates to a stainless steel and a production method thereof, in particular to a high-carbon and sulfur-containing ferrite free-cutting stainless steel and a production method thereof. Background technique [0002] As China has become the largest consumer of stainless steel in the world, the application fields of stainless steel continue to expand. Correspondingly, the demand for free-cutting stainless steel is also increasing year by year. At present, the domestic free-cutting stainless steel starts relatively late, and only a few large-scale enterprises start production, especially the high-efficiency and environmentally friendly free-cutting stainless steel is still in the exploration stage. The core technology and production process of free-cutting stainless steel, especially high-end free-cutting stainless steel, are mastered by foreign iron and steel enterprises, and its production process is extremely confidential, and there are f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/02C22C38/04C22C38/40C21D8/02
CPCC22C38/60C21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/40
Inventor 张荣兴郭键白李国徐建平焦克强孔令波刘维魏巧灵薛正国贾育华张孟昀马祥锋赵俊岭宋云霞吕海瑶
Owner XINGTAI IRON & STEEL
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