CN103276317A

CN103276317A - Production method of two-phase stainless steel

Info

Publication number: CN103276317A
Application number: CN 201310191179
Authority: CN
Inventors: 庄红芳
Original assignee: JIANGSU QIDI ALLOY CO Ltd
Current assignee: JIANGSU QIDI ALLOY CO Ltd
Priority date: 2013-05-22
Filing date: 2013-05-22
Publication date: 2013-09-04

Abstract

The invention discloses a production method of a two-phase stainless steel. The two-phase stainless steel comprises the following chemical components in percentage by weight: not more than 0.002% of C, not more than 3% of Mn, not more than 0.02% of S, not more than 0.02% of P, 30%-40% of Cr, 8.5%-9.5% of Ni, 3.0%-4.0% of Mo, not more than 0.52% of AI, not more than 3% of Cu and the balance of Fe. The two-phase stainless steel obtained by the production method disclosed by the invention has high strength, good plasticity and forming performance and excellent local corrosion resistance, and is a material which is resistant to neutral chloride local corrosion; the content of Cr and Ni is improved, so that the corrosion resistance of the two-phase stainless steel is greatly strengthened, and the service life of the two-phase stainless steel while being used on the devices including a seawater heat exchange device and a hot salt brine axial-flow pump and the like is prolonged.

Description

A kind of production method of duplex stainless steel

Technical field

The present invention relates to stainless steel and make the field, especially about a kind of production method of super diphase stainless steel welding material.

Background technology

The comprehensive mechanical property excellence of duplex stainless steel tubing has higher intensity and fatigue strength, and its yield strength is the twice of 18-8 steel; In the operating mode of chlorion high concentration, as having good anti-pitting/anti-corrosion at a seam/stress corrosion resistant ability in high temperature seawater/high-temp chlorination thing solution; Its welding region hot cracking tendency is less, and solderability is good.The two-way stainless steel of Ocr25Ni6Mo3CuN was developed by SUMITOMO CHEMICAL metal industry company in the seventies in 20th century, the characteristics of this steel grade are at Gao Ge, add tungsten on the basis of molybdenum, elements such as copper are in order to improve the slit and corrosion resistant performance of steel, be adapted to hot sea water, ambient conditions such as bittern water, compare with 300 series austenitic stainless steel, has high strength, good plasticity and plasticity, outstanding local corrosion performance is arranged, it is the material of an anti-neutral muriate local corrosion, included the ASTM standard in, the A790 standard, and list the UNS standard in the S31260 trade mark, and successfully be applied on the parts such as seawater heat exchange and hot bittern water propeller pump.But the price of this steel is higher, and the timeliness cover sample SCC resistance of steel can be relatively poor.

Summary of the invention

Day by day apply widely in order to adapt to duplex stainless steel, reinforcement is to the development of the universal and supporting welding material of duplex stainless steel welding technique, the object of the present invention is to provide a kind of super diphase stainless steel welding material and production method thereof, be on the two-way stainless basis of Ocr25Ni6Mo3CuN, add the add-on of rare earth material and control copper, make it have better mechanics and corrosion resistant welding material, to improve lumber recovery.

Technical scheme of the present invention realizes in the following manner: a kind of duplex stainless steel by weight percentage, its chemical ingredients is: C≤0.002%, Mn≤3%, S≤0.02%, P≤0.02%, Cr 30-40%, Ni 8.5-9.5%, Mo 3.0-4.0%, AI≤0.052%, Cu≤3%, all the other are Fe.

Its production method may further comprise the steps: 1) select materials, 2) melting, 3) cogging forges, 4) annealing, 5) pickling, 6) figure layer and coating configuration, 7) drawing, 8) prick head, 9) clean annealing, 10) check.

The present invention, has high strength, good plasticity and plasticity, outstanding local corrosion performance is arranged, it is the material of an anti-neutral muriate local corrosion, owing to improved the content of Cr and Ni, strengthened its corrosion resistance nature greatly, improved the employed life-span on the components such as seawater heat exchange and hot bittern water propeller pump.

Embodiment

A kind of duplex stainless steel by weight percentage, its chemical ingredients is: C≤0.03%, Mn≤1%, Si≤1%, S≤0.02%, P≤0.02%, Cr 27-29%, Ni 7.5-9.5%, Mo 3.0-4.0%, all the other are Fe.

A kind of production method of duplex stainless steel may further comprise the steps:

1, selects materials;

2, melting;

3, cogging is forged;

4, annealing;

5, pickling;

6, figure layer and coating configuration;

7, drawing;

8, prick head;

9, clean annealing;

10, check.

Claims

1. duplex stainless steel, by weight percentage, its chemical ingredients is: C≤0.002%, Mn≤3%, S≤0.02%, P≤0.02%, Cr 30-40%, Ni 8.5-9.5%, Mo 3.0-4.0%, AI≤0.052%, Cu≤3%, all the other are Fe.

2. the production method of a duplex stainless steel according to claim 1 is characterized in that: may further comprise the steps: 1) select materials, 2) melting, 3) cogging forges, 4) annealing, 5) pickling, 6) figure layer and coating configuration, 7) drawing, 8) prick head, 9) clean annealing, 10) check.