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High-strength duplex stainless steel and heat-treatment technology thereof

A duplex stainless steel, high-strength technology, applied in the field of stainless steel and its heat treatment, high-strength duplex stainless steel and its heat treatment process, can solve the problems of sensitivity to intergranular corrosion, poor pitting corrosion resistance, poor low temperature toughness, etc. The effect of high temperature tempering brittleness, high corrosion resistance and high tensile strength

Inactive Publication Date: 2017-05-24
ENG EQUIP CO LTD SUZHOU SAI SIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can achieve high strength, there are also many shortcomings, such as: coarse grains, poor low temperature toughness, sensitive to intergranular corrosion, poor pitting corrosion resistance, poor processability, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The above-mentioned high-strength duplex stainless steel provided in this embodiment, the mass percentage of its chemical composition is: C≤0.03%, Cr: 16.0%, Ni: 2.1%, Mn: 0.31%, Mo: 1.2%, Co: 0.24%, Si: 0.39%, Nb: 0.14%, Ti: 0.17%, Ge: 0.12%, Cu: 0.52%, V: 0.25%, Ca: 0.05%, Re: 0.15%, Se: 0.17%, S: 0.015%, P: 0.021%, rare earth elements: 5.5%, the rest are Fe and inevitable impurities;

[0040] The component mass percentages of the rare earth elements are: cerium: 11%, praseodymium: 17%, neodymium: 5%, gadolinium: 3%, samarium: 16%, dysprosium: 8%, the balance is lanthanum, the above components The sum is 100%;

[0041] In the stainless steel, the first phase is austenite, the second phase is ferrite, the volume percentage of the second phase from the surface to 1 / 4 thickness is 3.9%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 5.9% ; The average austenite grain diameter of the stainless steel from the surface to 1 / 4 thickness is...

Embodiment 2

[0048] The high-strength duplex stainless steel provided in this embodiment has the following chemical components by mass percentage: C≤0.03%, Cr: 16.3%, Ni: 2.8%, Mn: 0.33%, Mo: 1.7%, Co: 0.26% , Si: 0.40%, Nb: 0.15%, Ti: 0.18%, Ge: 0.14%, Cu: 0.53%, V: 0.27%, Ca: 0.06%, Re: 0.17%, Se: 0.18%, S: 0.018% , P: 0.022%, rare earth elements: 5.9%, the rest are Fe and inevitable impurities;

[0049] The component mass percentages of the rare earth elements are: cerium: 13%, praseodymium: 18, neodymium: 6%, gadolinium: 5%, samarium: 17%, dysprosium: 9%, the balance is lanthanum, and the above components are and is 100%;

[0050] In the stainless steel, the first phase is austenite, the second phase is ferrite, the volume percentage of the second phase from the surface to 1 / 4 thickness is 4.0%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 6.1% ; The average austenite grain diameter of the stainless steel from the surface to 1 / 4 thickness is 4.5 μ...

Embodiment 3

[0057] The high-strength duplex stainless steel provided in this embodiment has the following chemical composition mass percentages: C≤0.03%, Cr: 16.5%, Ni: 3.3%, Mn: 0.35%, Mo: 2.2%, Co: 0.31% , Si: 0.41%, Nb: 0.16%, Ti: 0.19%, Ge: 0.15%, Cu: 0.54%, V: 0.31%, Ca: 0.07%, Re: 0.19%, Se: 0.19%, S: 0.025% , P: 0.023%, rare earth elements: 6.6%, the rest are Fe and inevitable impurities;

[0058] The component mass percentages of the rare earth elements are: cerium: 14%, praseodymium: 19%, neodymium: 7%, gadolinium: 7%, samarium: 18%, dysprosium: 10%, the balance is lanthanum, the above components The sum is 100%;

[0059] In the stainless steel, the first phase is austenite, the second phase is ferrite, the volume percentage of the second phase from the surface to 1 / 4 thickness is 4.1%, and the volume percentage of the second phase from 1 / 4 thickness to the center is 6.2% ; The average austenite grain diameter of the stainless steel from the surface to 1 / 4 thickness is 4.7 μm, ...

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Abstract

The invention discloses a high-strength duplex stainless steel. The high-strength duplex stainless steel comprises the following chemical components in percentage by mass: C which is smaller than or equal to 0.03%, 16.0-16.5% of Cr, 2.1-3.3% of Ni, 0.31-0.35% of Mn, 1.2-2.2% of Mo, 0.24-0.31% of Co, 0.39-0.41% of Si, 0.14-0.16 of Nb, 0.17-0.19% of Ti, 0.12-0.15% of Ge, 0.52-0.54% of Cu, 0.25-0.31% of V, 0.05-0.07% of Ca, 0.15-0.19% of Re, 0.17-0.19% of Se, 0.015-0.025% of S, 0.021-0.023% of P, 5.5-6.6% of rare earth elements, and the balance of Fe and inevitable impurities. An corrosion-resistant plate made of the high-strength stainless steel disclosed by the invention not only is high in tensile strength and yield strength, but also high in corrosion resistance; and the rare earth elements are added, so that the interaction between a corrosive medium and the stainless steel is avoided, and besides, the extensibility of the stainless steel plate is improved, the functions of eliminating bubbles caused by hydrogen in steel ingots and reducing cracks in steel billets are added, and particles are refined.

Description

Technical field [0001] The invention relates to a stainless steel and a heat treatment method thereof, specifically a high-strength duplex stainless steel and a heat treatment process thereof, and belongs to the technical field of metal smelting and treatment. Background technique [0002] The reason why stainless steel has excellent rust resistance and corrosion resistance is that Cr on the surface of stainless steel easily reacts with oxygen in the atmosphere to form Cr. 2 O 3 The dense passive oxide film blocks water vapor and oxygen in the atmosphere, protecting the substrate from being corroded by oxidation. Even if the material itself is damaged by external force or chemical means, Cr 2 O 3 It can also be regenerated quickly. In addition to corrosion resistance, stainless steel also has the advantages of heat resistance, high temperature corrosion resistance, high temperature strength, etc. On the other hand, although the mechanical properties of stainless steel are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/60C21D1/18
CPCC22C38/004C21D1/18C21D2211/001C21D2211/005C22C38/002C22C38/005C22C38/02C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/60
Inventor 顾建强陈平
Owner ENG EQUIP CO LTD SUZHOU SAI SIDE
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