Austenitic stainless steel resistant to high temperature and high-concentration sulfuric acid
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A high-concentration austenitic stainless steel technology, applied in the field of austenitic corrosion-resistant steel, can solve the problems of high leakage rate, long manufacturing period, and cracking of steel shells in towers lined with acid-resistant ceramic tiles, and achieve the improvement of comprehensive machinery Improvement of performance and acid resistance, and improvement of yield
Inactive Publication Date: 2018-05-29
YONGXING SPECIAL STAINLESS STEEL
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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.
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Embodiment 1
[0047] An austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, including the following components: Cr 13.3wt%, Ni 15.2wt%, Si 5.9wt%, Cu 0.98wt%, Mo 0.9wt%, C0.014wt%, Mn1.1wt% %, S 0.002wt%, P0.022wt%, Al 0.05wt%, N 0.015wt%, B 0.004wt%, rare earth 0.03wt%, Bi 0.001wt%, As0.002wt%, Pb 0.002wt%, Sn 0.005% , Sb 0.002 wt%, the balance is Fe; and the sum of the five elements of Bi, As, Pb, Sn, Sb <0.05wt%.
Embodiment 2
[0049] An austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, including the following components: Cr 13.6wt%, Ni 15.7wt%, Si 6.05wt%, Cu 0.95wt%, Mo 1.0wt%, C 0.012wt%, Mn 1.0wt% %, S 0.001wt%, P0.020wt%, Al 0.03wt%, N 0.018wt%, B 0.004wt%, rare earth 0.03wt%, Bi 0.001wt%, As0.002wt%, Pb 0.002wt%, Sn 0.004% , Sb 0.001 wt%, the balance is Fe; and the sum of Bi, As, Pb, Sn, Sb five elements <0.05wt%.
Embodiment 3
[0051] An austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, including the following components: Cr 17.8wt%, 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%, Sn 0.005%, Sb 0.002 wt%, the balance is Fe; and the sum of Bi, As, Pb, Sn, Sb five elements <0.05wt%.
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Abstract
The invention relates to an austenitic stainless steel resistant to high temperature and high-concentration sulfuric acid and belongs to the technical field of austenitic stainless steel. The austenitic stainless steel resistant to high temperature and high-concentration sulfuric acid comprises, by weight, 13-19.5% of Cr, 13-22% of Ni, 4.5-6.5% of Si, 0.30-1.5% of Cu, 0.75-2.5% of Mo, 0.07% or less of C, 2% or less of Mn, 0.015% or less of S, 0.03% or less of P, 0.3% or less of Al, inevitable impurities, and the balance Fe. Among steel varieties in the prior art, Zecor, Saramet35 and sandvik SX developed by foreign companies are similar to the austenitic stainless steel on the aspects of material design and overall performance, and compared with the steel of foreign countries, the austenitic stainless steel has more obvious advantages on the aspects of material manufacturing process, yield improvement, corrosion resistance and the like.
Description
technical field [0001] The invention relates to an austenitic corrosion-resistant steel, in particular to an austenitic stainless steel resistant to high temperature and high concentration of sulfuric acid, belonging 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: first, the tower body lined wi...
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