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Sulfur-containing and bismuth-containing free cutting stainless steel and preparation method thereof

An easy-cutting, stainless steel technology, applied in the direction of furnace types, furnaces, electric furnaces, etc., can solve the problems of poor steel processing performance and failure to mass produce

Inactive Publication Date: 2019-05-31
宝钢特钢长材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since no Bi is added, the cutting performance basically meets the requirements, and it has also been tried to increase the S content to improve the cutting performance, but it has not been mass-produced due to the poor processing performance of the steel.

Method used

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  • Sulfur-containing and bismuth-containing free cutting stainless steel and preparation method thereof
  • Sulfur-containing and bismuth-containing free cutting stainless steel and preparation method thereof

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Embodiment Construction

[0014] The sulfur-containing and bismuth-containing free-cutting stainless steel (303CuB) of the present invention, by weight percentage, comprises:

[0015] C: ≤0.08%, Si: 0.5~1.0%, Mn: 2.0~3.0%, P≤0.06%, S: 0.20~0.35%, Ni: 8.5~1.0%, Cr: 17.0~19.0%, Cu: 2.0~ 3.0%, Bi: 0.02-0.2%, N: ≤0.07%, and the rest are iron and unavoidable impurities.

[0016] Among them, carbon is an element that strongly forms austenite in austenitic stainless steel, which can stabilize and expand the austenite phase region and increase the hot workability of austenitic stainless steel. High carbon can significantly improve the solid solution of austenitic stainless steel Strength increases the tendency of pitting corrosion of austenitic stainless steel, so C is controlled at 0-0.08%.

[0017] Chromium can promote the passivation of austenitic stainless steel and maintain a stable passivation state, improve the resistance of steel to oxidizing media and acid chloride media, and improve the resistance o...

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Abstract

The invention discloses a sulfur-containing and bismuth-containing free cutting stainless steel. The sulfur-containing and bismuth-containing free cutting stainless steel comprises less than or equalto 0.08% of C, 0.5-1.0% of Si, 2.0-3.0% of Mn, less than or equal to 0.06% of P, 0.20-0.35% of S, 8.5-1.0% of Ni, 17.0-19.0% of Cr, 2.0-3.0% of Cu, 0.02-0.2% of Bi, less than or equal to 0.07% of N and the balance of iron and inevitable impurities according to the weight percentage. The invention further discloses a preparation method of the sulfur-containing and bismuth-containing free cutting stainless steel. According to the sulfur-containing and bismuth-containing free cutting stainless steel, by using a method of adding a bismuth element, the cutting performance of a material is improved;by reducing the sulfur content and using an intermediate slab online heating and dry head rolling technology during rolling, a problem that the hot-working character becomes poor due to the adding ofbismuth is solved; solid solution adopts 1050 degrees centigrade complete solid solution process; before acid pickling of a steel wire rod, a problem that the acid pickling surface is easy to be superacid after high temperature treatment is solved through salt bath treatment.

Description

technical field [0001] The invention relates to free-cutting steel, more specifically to a sulfur-containing and bismuth-containing free-cutting stainless steel and a preparation method thereof. Background technique [0002] With the development of the stainless steel market, it is necessary to further improve the processing performance of the material. At present, the largest amount of free-cutting stainless steel is 303CuS2. The free-cutting element of this steel is mainly sulfur. Although high sulfur can increase the machinability of the steel, it has a great impact on the cold and hot workability of the steel. Therefore, the sulfur element There is an upper limit requirement. For a long time, a special steel company has used an electric furnace to produce 303CuS2 steel, with a Cu content of 2.0-2.5%, a Mn content of 2.0-3.0%, and a sulfur content of 0.25-0.30%. Since no Bi is added, the cutting performance basically meets the requirements, and it has also been tried to...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/42C22C38/58C22C33/04C21C5/52C21C7/00C21D8/06
CPCY02P10/20
Inventor 臧震罗晓青邵健翔
Owner 宝钢特钢长材有限公司
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