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A kind of duplex stainless steel and preparation method thereof

A duplex stainless steel and steel billet technology, applied in the field of duplex stainless steel, can solve the problems of corrosion resistance and thermoforming performance, difficulty in ensuring the stability of the two-phase structure, and increasing the difficulty of thermal processing, so as to improve thermal processing performance, Increase the content of nitrogen and the effect of grain refinement

Active Publication Date: 2020-08-21
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the content of nickel in the element components of the above two technical solutions is reduced, there is no corresponding increase in the content of manganese, so it is difficult to ensure the stability of the two-phase structure, which in turn increases the difficulty of thermal processing
[0006] In summary, the content of nickel in the duplex stainless steel in the prior art has been reduced, and the cost has also been reduced to a certain extent, but the corrosion resistance and thermoforming performance still need to be improved

Method used

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  • A kind of duplex stainless steel and preparation method thereof
  • A kind of duplex stainless steel and preparation method thereof
  • A kind of duplex stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The duplex stainless steel of this embodiment is composed of the following elements by weight: C: 0.01%, Cr: 26%, Ni: 0.8%, Mo: 4.9%, Mn: 0.5%, N: 0.6%, Ce: 0.18% , Co: 0.2%, Si: 0.5%, P: 0.02%, S: 0.02%, and the balance is Fe and unavoidable impurity elements, wherein the weight percentage of impurity elements is 0.008%.

[0051] In this example, the ratio of Cr equivalent to Ni equivalent is 1.64, where Cr eq =Cr wt.%+Mo wt.%+1.5×Si wt.%+0.5×Nb wt.%=26%+4.9%+1.5×0.5%+0.5×0=31.65%; Ni eq =Ni wt.%+30×(C wt.%+N wt.%)+0.5×Mn wt.%=0.8%+30×(0.01%+0.6%)+0.5×0.5%=19.35%. The PREN value of the duplex stainless steel in this example is 51.77, and the PREN value is Cr%+3.3×Mo%+16×N%=26%+3.3×4.9%+16×0.6%=51.77%.

Embodiment 2

[0053] The duplex stainless steel of this embodiment is composed of the following elements by weight: C: 0.01%, Cr: 27%, Ni: 0.8%, Mo: 5%, Mn: 0.5%, N: 0.6%, Ce: 0.18% , Co: 0.3%, Si: 0.5%, P: 0.02%, S: 0.02%, and the balance is Fe and unavoidable impurity elements, wherein the weight percentage of impurity elements is 0.08%.

[0054] In this example, the ratio of Cr equivalent to Ni equivalent is 1.69, where Cr eq =Cr wt.%+Mo wt.%+1.5×Si wt.%+0.5×Nb wt.%=27%+5%+1.5×0.5%+0.5×0=32.75%; Ni eq=Ni wt.%+30×(C wt.%+N wt.%)+0.5×Mn wt.%=0.8%+30×(0.01%+0.6%)+0.5×0.5%=19.35%. The PREN value of the duplex stainless steel in this example is 53.1, and the PREN value=Cr%+3.3×Mo%+16×N%=27%+3.3×5%+16×0.6%=53.1%.

Embodiment 3

[0056] The duplex stainless steel of this embodiment is composed of the following elements by weight: C: 0.01%, Cr: 27%, Ni: 1.5%, Mo: 5.6%, Mn: 0.6%, N: 0.63%, Ce: 0.18% , Co: 0.4%, Si: 0.6%, P: 0.02%, S: 0.02%, and the balance is Fe and unavoidable impurity elements, wherein the weight percentage of impurity elements is 0.08%.

[0057] In this example, the ratio of Cr equivalent to Ni equivalent is 1.6, where Cr eq =Cr wt.%+Mo wt.%+1.5×Si wt.%+0.5×Nb wt.%=27%+1.5×0.6%+0.5×0=33.5%; Ni eq =Ni wt.%+30×(Cwt.%+N wt.%)+0.5×Mn wt.%=1.5%+30×(0.01%+0.63%)+0.5×0.6%=21. The PREN value of the duplex stainless steel in this example is 55.56, and the PREN value=Cr%+3.3×Mo%+16×N%=27%+3.3×5.6%+16×0.63%=55.56%.

[0058] Example 1 of the preparation method of duplex stainless steel

[0059] The elements and weight percentages in the stainless steel prepared in the preparation method of the duplex stainless steel in this embodiment are the same as in Example 1 of the duplex stainless steel....

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Abstract

The invention relates to duplex stainless steel and a preparation method thereof and belongs to the technical field of duplex stainless steel. The duplex stainless steel is composed of following elements including, by weight percentage, 0.01-0.03% of C, 24-27% of Cr, 0.5-2% of Ni, 4-6% of Mo, 0.5-1.5% of Mn, 0.6-0.75% of N, 0.15-0.3% of Ce, 0.1-0.5% of Co, 0.4-1% of Si, smaller than or equal to 0.03% of P, smaller than or equal to 0.03% of S and the balance Fe and inevitable impurities. According to the duplex stainless steel, the content of N is increased to replace some expensive Ni, the production cost can be reduced, Ce is added to refine texture crystal grain, the proper amount of alloy element Co is added to reduce precipitation of an intermetallic compound, thus the comprehensive performance of the stainless steel is improved remarkably, and the duplex stainless steel has the advantages of being good in heat formability, high in corrosion resistant performance, high in strengthand the like.

Description

technical field [0001] The invention relates to a duplex stainless steel and a preparation method thereof, belonging to the technical field of duplex stainless steel. Background technique [0002] Duplex stainless steel has high strength and excellent corrosion resistance, and is widely used in production and life. At present, it is mainly used in the fields of oil and gas, chemical industry, food, energy, and construction. The main components of duplex stainless steel are chromium, nickel, and molybdenum. Among them, nickel and molybdenum are precious metals, which are expensive, and nickel resources in my country are relatively scarce. my country is rich in rare earth resources. As the microalloying effect of rare earths in stainless steel has been paid more and more attention, rare earths have also played an increasingly important role in the performance of duplex stainless steels. The development of duplex stainless steel can be divided into three generations: the first...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/52C21D8/00C22C33/04
Inventor 熊毅姚怀岳赟陈艳娜路妍周甜贺甜甜曹伟马景灵刘玉亮张凌峰任凤章
Owner HENAN UNIV OF SCI & TECH
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