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Preparation method of austenitic stainless steel resisting high-temperature and high-concentration sulfuric acid

An austenitic stainless steel, high-concentration technology, applied in the field of austenitic stainless steel, can solve the problems of complicated construction, long manufacturing period, heavy tower body with steel shell lining bricks, etc.

Inactive Publication Date: 2018-06-05
YONGXING SPECIAL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Years of production practice have shown that this structure has many disadvantages: first, the tower body lined with acid-resistant ceramic tiles has a high leakage rate, and safety accidents such as steel shell expansion and cracking are prone to occur; second, the tower body lined with steel shell bricks is very heavy and the construction is complicated , long manufacturing period, high operation and maintenance costs
For example, foreign companies have successively developed brands such as Zecor (similar to ASTM S38815), Saramet35, and sandvik SX (similar to ASTM S32615), but due to reasons such as processing technology, performance, and cost, they have not been widely used in China.

Method used

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  • Preparation method of austenitic stainless steel resisting high-temperature and high-concentration sulfuric acid

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Experimental program
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Effect test

Embodiment 1

[0064] An austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, comprising the following components: Cr 13.3wt%, Ni15.2wt%, Si5.9wt%, Cu 0.98wt%, Mo 0.9wt%, C0.014wt%, Mn1.1wt% %, S 0.002wt%, P 0.022wt%, Al 0.05wt%, N 0.015wt%, B 0.004wt%, rare earth 0.03wt%, Bi 0.001wt%, As 0.002wt%, Pb0.002wt%, Sn0.005 %, Sb 0.002wt%, the balance is Fe; and the sum of Bi, As, Pb, Sn, Sb five elements <0.05wt%.

[0065] In this embodiment, the preparation method of austenitic stainless steel is as follows:

[0066] (1) Ingredients: Raw materials are prepared according to the chemical composition and burning loss of austenitic stainless steel. The main raw materials include but are not limited to low-phosphorus carbon steel, low-phosphorus ferrochrome, ferronickel, nickel plate, ferromolybdenum, metal copper, and ferrosilicon , metal silicon; send the raw materials into the electric arc furnace to melt into molten steel, add 28kg / t of slagging agent...

Embodiment 2

[0074] An austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, including the following components: Cr 13.6wt%, Ni15.7wt%, Si6.05wt%, Cu 0.95wt%, Mo 1.0wt%, C 0.012wt%, Mn 1.0wt% %, S 0.001wt%, P 0.020wt%, Al 0.03wt%, N 0.018wt%, B 0.004wt%, rare earth 0.03wt%, Bi 0.001wt%, As 0.002wt%, Pb0.002wt%, Sn0.004 %, Sb 0.001wt%, the balance is Fe; and the sum of Bi, As, Pb, Sn, Sb five elements <0.05wt%.

[0075] In this embodiment, the preparation method of austenitic stainless steel is as follows:

[0076] (1) Ingredients: Raw materials are prepared according to the chemical composition and burning loss of austenitic stainless steel. The main raw materials include but are not limited to low-phosphorus carbon steel, low-phosphorus ferrochrome, ferronickel, nickel plate, ferromolybdenum, metal copper, and ferrosilicon , metal silicon; send the raw materials into the electric arc furnace to melt into molten steel, add 30kg / t of slagging age...

Embodiment 3

[0084] An austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, including the following components: Cr17.8wt%, Ni 20.wt%, Si5.4wt%, Cu 0.92wt%, Mo 1.95wt%, C 0.015wt%, Mn 1.1 wt%, S 0.002wt%, P0.022wt%, Al 0.04wt%, N≤0.016wt%, B 0.003wt%, rare earth 0.02wt%, Bi 0.001wt%, As0.002wt%, Pb 0.002wt%, Sn0 .005%, Sb 0.002wt%, the balance is Fe; and the sum of Bi, As, Pb, Sn, Sb five elements <0.05wt%.

[0085] In this embodiment, the preparation method of austenitic stainless steel is as follows:

[0086] (1) Ingredients: Raw materials are prepared according to the chemical composition and burning loss of austenitic stainless steel. The main raw materials include but are not limited to low-phosphorus carbon steel, low-phosphorus ferrochrome, ferronickel, nickel plate, ferromolybdenum, metal copper, and ferrosilicon , metal silicon; send the raw materials into the electric arc furnace to melt into molten steel, add 32kg / t slagging agent lim...

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Abstract

The invention relates to a preparation method of austenitic stainless steel, in particular to the preparation method of the austenitic stainless steel resisting high-temperature and high-concentrationsulfuric acid and belongs to the technical field of the austenitic stainless steel. The method sequentially comprises the process steps of burdening, oxygen blowing decarburization, reduction, steeltapping, ladle refining, casting, cogging, hot rolling and the like. The invention discloses the austenitic stainless steel resisting the high-temperature and high-concentration sulfuric acid. By query and comparison, steel grades in the prior art, namely Zecor, Saramet35 and sandvik SX developed by foreign companies are similar to a steel grade disclosed by the invention in material design and overall performance; compared with the foreign steel grades, the steel grade disclosed by the invention has more obvious advantages in the aspects of a material preparation process, yield improvement, corrosion resistance and the like.

Description

technical field [0001] The invention relates to a method for preparing austenitic stainless steel, in particular to a method for preparing austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, and belongs to the technical field of austenitic stainless steel. Background technique [0002] Sulfuric acid, as an important industrial raw material, is also known as the mother of industry. It can be used to manufacture fertilizers, medicines, explosives, pigments, detergents, batteries, etc. It is also widely used in industries such as purification of petroleum, metal smelting, and dyes. It can be used as a chemical reagent, and can be used as a dehydrating agent and sulfonating agent in organic synthesis. [0003] Drying towers and absorption towers in the sulfuric acid production process are generally made of steel shells lined with acid-resistant tiles. Years of production practice have shown that this structure has many disadvantages...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/068C21C7/072C22C38/42C22C38/44C22C38/58C22C38/04C22C38/02C22C38/06C22C38/54C22C38/60C22C30/02C22C30/04
CPCC21C7/0006C21C7/068C21C7/072C21D2211/001C22C30/02C22C30/04C22C33/04C22C38/001C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/54C22C38/58C22C38/60Y02P10/20
Inventor 王建勇顾晓暾杜雯雯陈根保吴明华慎琪琦张跃良邹伟民
Owner YONGXING SPECIAL STAINLESS STEEL
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