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Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof

A technology for austenitic stainless steel and its manufacturing method, which is applied in the field of nitrogen-containing nickel-free austenitic stainless steel and its manufacturing, and can solve the problems of reducing corrosion resistance and negative corrosion resistance

Active Publication Date: 2013-11-13
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Cr content in these patented composition systems is generally lower than 18% in 304 austenitic stainless steel, which reduces the corrosion resistance; on the other hand, a higher content of Mn is added, and the impact of Mn on corrosion resistance is negative , also reduces the corrosion resistance

Method used

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  • Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof
  • Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof
  • Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof

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Embodiment 1

[0048] The alloy metallographic diagram of embodiment 1 is as figure 1 As shown (austenite structure at room temperature), the sample was electrolytically corroded, the etchant was saturated oxalic acid solution, and the corrosion current was 0.2-0.4A / cm 2 . Table 2 shows the mechanical properties and corrosion properties of the steels of the present invention and comparative steels. The mechanical properties are taken from the hot-rolled annealed sheet, which is processed and tested according to JIS 13B standard. The pitting corrosion resistance equivalent is calculated according to the general formula PREN=Cr%+3.3Mo%+30N%-Mn%.

[0049] The composition unit of table 1 embodiment and comparative example: weight percent

[0050]

[0051]

[0052] The performance of table 2 embodiment and comparative example

[0053]

[0054] Note: Comparative examples 1, 2, 3, and 4 are respectively CN101148740, CN101381852, CN101509104, and 304 austenitic s...

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Abstract

The invention discloses molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and a manufacturing method thereof. The molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance contains: by weight, 0.03 to 0.10% of C, 0.2 to 1.0% of Si, 4.0 to 9.0% of Mn, 16.5 to 18.0% of Cr, 1.5 to 3.5% of Ni, 0.15 to 0.35% of N, 0.2 to 0.8% of Mo, 0.01 to 2.5% of Cu, less than or equal to 0.1% of one or more of V, Nb, Ca and B, and the balance Fe and unavoidable impurities. Through the manufacturing method, Ni content is controlled in a rang of 1.5 to 3.5%, and Mn and N elements are added to replace precious metal Ni to be utilized for austenitizing, so that a microstructure of room-temperature austenite is obtained. The manufacturing method adopts 0.2 to 0.8% of Mo and utilizes a synergistic effect of Cr, Mo and N to improve corrosion resistance. Through the manufacturing method, the pitting-resistance equivalent number of the molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance is great than or equal to 18 and the pitting potential is great than or equal to 330mV, wherein the properties of the molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance are equivalent to or superior to corresponding properties of 304 austenitic stainless steel.

Description

technical field [0001] The invention relates to a nitrogen-containing nickel-sparing austenitic stainless steel and a manufacturing method thereof, in particular to a molybdenum-containing nickel-sparing austenitic stainless steel with excellent corrosion resistance and a manufacturing method thereof. The PREN of the material is greater than or equal to 18. Background technique [0002] The most widely used 300-series austenitic stainless steel usually contains 8% to 12% nickel, and the cost of nickel element accounts for about 80% of the cost of raw materials. Since 2005, the price of nickel, an important alloying element in stainless steel, has continued to rise, leading to an increase in the cost of raw materials for stainless steel production. At the same time, it is predicted that the shortage of rare and precious metal nickel has a certain long-term nature. This makes reducing the cost of stainless steel production a key issue for the development of iron and steel ente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58
Inventor 张伟胡锦程江来珠王治宇宋红梅韩俭
Owner BAOSTEEL DESHENG STAINLESS STEEL
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