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Sn-containing austenitic stainless steel and manufacturing method thereof

A kind of technology of austenitic stainless steel and manufacturing method, which is applied in the field of Sn-containing austenitic stainless steel, can solve the problems of unsuitable environment for sulfuric acid corrosion resistance, poor sulfuric acid corrosion resistance, severe corrosion, etc., so as to improve sulfuric acid corrosion resistance, good The effect of mechanical properties, good plasticity and toughness

Inactive Publication Date: 2013-07-17
BAOSTEEL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the common defect of the above-mentioned Sn-containing martensitic and ferritic stainless steels is that they are severely corroded in sulfuric acid, and their corrosion resistance to sulfuric acid is very poor, so they cannot be used in environments resistant to sulfuric acid corrosion.

Method used

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  • Sn-containing austenitic stainless steel and manufacturing method thereof
  • Sn-containing austenitic stainless steel and manufacturing method thereof
  • Sn-containing austenitic stainless steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Adopt the steel of chemical composition shown in embodiment 1 in the vacuum furnace smelting table 2, mold cast into steel ingot, Sn is with Fe 60 sn 40 The alloy is added; the steel ingot is opened into a 50mm thick square ingot, and the heating furnace is heated to 1250°C with the furnace and then kept for 1 hour. , air cooling; the hot-rolled sheet was solution annealed at 1050°C for 3 minutes, cooled to room temperature in water, and then descaled by scale breaking, shot blasting, electrolytic pickling, and mixed acid pickling; the pickled sheet was cold-rolled to a thickness of 1mm, The rolled sheet was solution annealed at 1080°C for 1 min, and then water-cooled to room temperature; the cold-rolled annealed sheet was descaled, shot blasted, electrolytic pickling, mixed acid pickling and other processes to remove scale and obtain Sn-containing austenitic stainless steel.

[0050] The tensile properties of the Sn-containing austenitic stainless steel obtained in th...

Embodiment 2

[0052] Adopt electric furnace, AOD duplex to smelt the steel of chemical composition shown in embodiment 2 in table 2, continuously cast into 200mm thick billet, Sn is with Fe 60 sn 40 The way of alloy is added in AOD; the continuous casting slab is added into the furnace, heated to 1260°C and kept for 2.5h, hot rolled to 4mm thick, the final rolling temperature is 950°C, then laminar water cooling to 700°C coiling, air cooling; hot rolled plate Solution annealing at 1080°C for 5 minutes, water cooling to room temperature, and then remove the scale by scale breaking, shot blasting, electrolytic pickling, mixed acid pickling and other processes; the pickled plate is cold rolled to a thickness of 1.5mm, and the cold rolled plate is solidified at 1100°C Solution annealing for 1.5min, water cooling to room temperature; scale breaking, shot blasting, electrolytic pickling, mixed acid pickling and other processes to remove scale on the cold-rolled annealed sheet to obtain Sn-contain...

Embodiment 3

[0055] The steel with the chemical composition shown in Example 3 in Table 2 was smelted by electric furnace, AOD, and VOD three-step method. During VOD, Fe-Sn alloy wire was fed, and continuous casting was made into a 180mm thick billet; the continuous casting billet was added to the furnace and heated to 1220°C After heat preservation for 2 hours, hot rolling to 2mm thickness, the final rolling temperature is 950°C, then laminar water cooling to 670°C coiling, air cooling; hot-rolled sheet is solution annealed at 1080°C for 3 minutes, water cooled to room temperature, and then subjected to scale breaking and shot blasting , electrolytic pickling, mixed acid pickling and other processes to remove scale, and obtain Sn-containing austenitic stainless steel hot-rolled annealed sheets.

[0056] The tensile properties of the Sn-containing austenitic stainless steel obtained in this example are tested according to GB / T228-2002, and the mechanical properties fully meet the product st...

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Abstract

The invention discloses Sn-containing austenitic stainless steel and a manufacturing method thereof. The Sn-containing austenitic stainless steel is chemically composed of, by weight, < / =0.030% of C, < / =1.00% of Si, < / =2.00% of Mn, < / =0.045% of P, < / =0.030% of S, 10.00-15.00% of Ni, 16.00-18.50% of Cr, 2.00-3.00% of Mo, < / =0.10% of N, 0.01-1.00% of Sn, < / =1.2% of Cu, and the balance Fe and unavoidable impurities. On the basis of existing 316L stainless steel, resistance to reducing sulfuric acid corrosion is improved through Sn micro-alloying, and better effect is obtained by compositely adding a small amount of Cu. On the basis of maintaining original low cost and mechanical performance, resistance to sulfuric acid corrosion is remarkably improved, and the Sn-containing austenitic stainless steel is suitable for SOx-containing corrosive environments more demanding in corrosion resistance.

Description

technical field [0001] The invention relates to a Cr-Ni-Mo type austenitic stainless steel, in particular to a Sn-containing austenitic stainless steel with excellent corrosion resistance, which can be applied to engine EGR systems and power plant flue gas desulfurization with strict corrosion resistance requirements Contain SO x corrosive environment. Background technique [0002] 300 series austenitic stainless steel is widely used because of its excellent corrosion resistance, formability and mechanical properties, and 304 and 316L steel types account for more than 80% of the total 300 series stainless steel. 304 belongs to Cr-Ni type austenitic stainless steel, which is widely used in household products, food industry, medical appliances, water heaters, boilers, auto parts, building materials, etc. in general corrosion-resistant environment; 316L belongs to Cr-Ni-Mo type austenitic stainless steel , due to its higher Ni content and adding a certain Mo content, it has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/44C21D8/02
Inventor 罗明骆素珍江来珠余海峰
Owner BAOSTEEL STAINLESS STEEL
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