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Novel tin-containing duplex stainless steel

A duplex stainless steel, a new type of technology, applied in the field of new tin-containing duplex stainless steel, to achieve good corrosion resistance, good mechanical properties and processing performance

Inactive Publication Date: 2018-05-04
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these are the addition of Sn to ferritic or austenitic stainless steel, and there are very few reports on Sn-containing dual-phase steel at home and abroad.

Method used

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  • Novel tin-containing duplex stainless steel
  • Novel tin-containing duplex stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, a new type of tin-containing duplex stainless steel is composed by mass percentage: Cr: 22.19%, Ni: 5.33%, Si: 0.51%, C: 0.028%, Mn: 1.42%, N: 0.17%, P: 0.021%, S: 0.0006%, Mo: 3.12%, Sn: 0.31%, Ti: 0.3%, V: 0.9%, rare earth elements: 0.006%, and the balance is Fe.

[0038] The traditional conventional electric furnace smelting process is adopted, and Fe60Sn40 master alloy is added in the smelting process. After electric furnace→AOD→LF→continuous casting→rolling.

[0039] Cr eq =22.19+1.5×0.51+3.12+0.5×0.31+1.5×0.3+1.5×0.9=28.03,

[0040] Ni eq =5.3+0.5×1.42+30×(0.028+0.17)=11.95,

[0041] according to figure 1 It can be seen that the steel is A+F and the ferrite content is about 40%. After treatment at a solid solution temperature of 1100°C, the ferrite content was measured to be 47%. After spot corrosion by ferric chloride at 35°C, soaked for 24 hours, the corrosion rate is 0.12mg / (dm 2 .d).

Embodiment 2

[0043] In this example, a new type of tin-containing duplex stainless steel is composed by mass percentage: Cr: 22.24%, Ni: 5.51%, Si: 0.44%, C: 0.028%, Mn: 1.42%, N: 0.15%, P: 0.02%, S: 0.0003%, Mo: 3.16%, Sn: 0.34%, Ti: 0.8%, rare earth elements: 0.008%, and the balance is Fe.

[0044] The traditional conventional electric furnace smelting process is adopted, and Fe60Sn40 master alloy is added in the smelting process. After electric furnace→AOD→LF→continuous casting→rolling.

[0045] Cr eq =22.24+1.5×0.44+3.16+0.5×0.34+1.5×0.8=27.43

[0046] Ni eq =5.51+0.5×1.42+30×(0.028+0.15)=11.56

[0047] according to figure 1 It can be seen that the steel is A+F, and the ferrite content is 53% after being treated at a solution temperature of 1080°C. After spot corrosion by ferric chloride at 35°C, soaked for 24 hours, the corrosion rate is 0.08mg / (dm 2 .d).

Embodiment 3

[0049] In this example, a new type of tin-containing duplex stainless steel is composed by mass percentage: Cr: 22.1%, Ni: 5.58%, Si: 0.51%, C: 0.028%, Mn: 1.45%, N: 0.17%, P: 0.021%, S: 0.0005%, Mo: 3.2%, Sn: 0.41%, Nb: 0.17%, Ti: 0.56%, rare earth elements: 0.007%, and the balance is Fe.

[0050] The traditional conventional electric furnace smelting process is adopted, and Fe60Sn40 master alloy is added in the smelting process. After electric furnace→AOD→LF→continuous casting→rolling.

[0051] Cr eq =22.1+1.5×0.51+3.2+0.5×0.41+1.5×(0.17+0.56)=27.365

[0052] Ni eq =5.58+0.5×1.45+30×(0.028+0.17)=12.245

[0053] according to figure 1 It can be seen that the steel is A+F, and the ferrite content is 44% after being treated at a solution temperature of 1080°C. After spot corrosion by ferric chloride at 35°C, soaked for 24 hours, the corrosion rate is 0.21mg / (dm 2 .d).

[0054] Examples 4-10 of the present invention are shown in the following table 2, and each component i...

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Abstract

The invention provides novel tin-containing duplex stainless steel with the advantages of high corrosion resistance and excellent mechanical property and processability. The novel tin-containing duplex stainless steel is characterized by comprising, by mass, 22%-23% of Cr, 4.5%-6.5% of Ni, less than 1% of Si, less than 0.03% of C, less than 2% of Mn, 0.14%-0.2% of N, less than 0.03% of P, less than 0.02% of S, 3%-3.5% of Mo, 0.2%-0.5% of Sn, 0.005%-0.01% of rare earth element as well as at least one of the following elements: 0-2% of Nb, 0-1% of Ti, 0-2% of Ta, 0-0.15% of Zr, 0-1.5% of V and the balance Fe.

Description

technical field [0001] The invention relates to a novel tin-containing duplex stainless steel. Background technique [0002] At present, more and more stainless steel is used in pollution prevention equipment and mechanical equipment, petrochemical equipment, power generation equipment, copper smelting, food processing, marine, impeller, casing, casing front cover, desulfurization equipment, etc. However, stainless steel is prone to corrosion and corrosion in high-temperature and high-concentration sulfuric acid environments, chloride ions and other halogen atmospheres, petroleum, acid environments, lime gypsum and other environments, and pitting corrosion is prone to occur in industrial water and seawater applications. [0003] In the duplex stainless steel, the ferrite phase and the austenite phase account for about half of the solid solution structure, and the content of the general minor phase also needs to reach 30%. In the case of low C content, the Cr content is 18%~...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/44C22C38/48C22C38/50C22C38/46
CPCC22C38/02C22C38/001C22C38/005C22C38/008C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 杨赛颜海涛杨振申鹏李杰
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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