CN103757559B

CN103757559B - There is the economical diphase stainless steel of phase transformation plasticization effect

Info

Publication number: CN103757559B
Application number: CN201410000448.3A
Authority: CN
Inventors: 肖学山; 冉庆选; 李昆坊; 刘庆; 李钧; 徐裕来; 余海峰; 江来珠
Original assignee: University of Shanghai for Science and Technology
Current assignee: TAIZHOU XINLONGXIANG METAL PRODUCT CO., LTD.
Priority date: 2014-01-02
Filing date: 2014-01-02
Publication date: 2016-08-17
Anticipated expiration: 2034-01-02
Also published as: CN103757559A

Abstract

The present invention relates to a kind of nickel-saving type and there is the economical diphase stainless steel of phase transformation plasticization effect, belong to steel alloy material technical field.The composition of this two phase stainless steel and mass percent: C≤0.03%, S≤0.03%, P≤0.03%, Cr:19.0～21.0%, Mn:8～12%, Ni:0.1～0.5%, N:0.15 ~ 0.35%, Si≤1.0%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, remainder is ferrum.This material uses the smelting process that tradition is conventional, after comprehensive dispensing is founded, moulding by casting, and through forge hot, cold rolling, then through suitable solution treatment, final preparing has the phase transformation particularly preferred diphase stainless steel alloy material of plasticization effect elongation percentage.

Description

There is the economical diphase stainless steel of phase transformation plasticization effect

Technical field

The present invention relates to one and there is the phase transformation particularly preferred two phase stainless steel of plasticization effect elongation percentage, belong to steel alloy material Technical field.

Background technology

Two phase stainless steel is made up of austenite and ferrite.The main component of two phase stainless steel is chromium, nickel, molybdenum, in order to drop Low cost, reduces the content of nickel in steel, can use the interpolation alloying element such as nitrogen, manganese.Along with domestic rustless steel production capacity with apparent disappear Taking the further sustainable growth of demand, the problem of chromium and Mo resource has emerged and the most prominent, the most existing economical double It is high with the contradiction of plasticity difference, its hot-working difficulty is big and thin plate elongation percentage is low that mutually stainless extensive application yet suffers from intensity Problem, in this context, for the deficiency of existing two phase stainless steel, is highly desirable to new generation and has phase-change induced plastic (TRIP) two phase stainless steel of the particularly preferred resource-conserving of effect elongation percentage, this series products cold and hot working performance is better than existing double Phase rustless steel, has low cost and excellent corrosion resisting property simultaneously, substitutes tradition rustless steel kind, and be widely used in household electrical appliances, The field such as goods and solar energy, to promote variety structure optimization and the technological progress of China's stainless steel industry further, and significantly Reduce noble alloy resource interdependency, make for national resources saving and should have contribution.

Summary of the invention

It is an object of the invention to provide one and there is phase transformation plasticization effect and the particularly preferred economical two-phase of elongation percentage not Rust steel.

The economical diphase stainless steel of the present invention, it is characterised in that have following composition and mass percent: C≤ 0.03%, S≤0.03%, P≤0.03%, Cr:19.0～21.0%, Mn:8～12%, Ni:0.1～0.5%, N:0.15 ~ 0.35%, Si≤1.0%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, surplus is ferrum.

The preparation method of the economical diphase stainless steel alloy material with TRIP effect of the present invention, it is characterised in that: Use the smelting process that tradition is conventional, before casting, rare earth intermediate alloy put into, prepare the most in advance need to centre Alloy；Intermediate alloy is made up of ferrum and rare earth metal, selects Fe-Ce or Fe-Y intermediate alloy；Both compositions are respectively as follows: Fe- In Ce intermediate alloy, the weight/mass percentage composition of Ce is 23.5%；In Fe-Y intermediate alloy, the weight/mass percentage composition of Y is 15%；Through comprehensive After dispensing is founded, moulding by casting, through forge hot, cold rolling, then through solution treatment, final prepare the two-phase stainless with TRIP effect Steel.Steel in this composition range is coexistence region 850～1300 DEG C of scopes, and austenite content about changes, through heat in 30～60% Forging is with cold rolling, then through uniform temperature solution treatment, the tensile break strength of room temperature is in 800～1000Mpa scopes, and yield strength exists 500～700Mpa scopes, fracture elongation is 55～75% scope.

The mechanism of the present invention is as described below:

According to alloying principle, with Mn and N for nickel, stable austenite, reduce precious metal nickel content.According to phase-change induced The principle of plasticity (TRIP) effect, lot of experiments finds, this economical diphase stainless steel controls suitable composition with suitable Solution treatment, and suitable cold and hot roll process, make two phase stainless steel produce a certain amount of martensitic phase in deformation process Become, thus effectively improve its plasticity so that it keeps the most stable elongation percentage in draw-texture process.

Detailed description of the invention

After now the specific embodiment of the present invention being described in.

Embodiment 1

In the present embodiment, use the composition of two phase stainless steel and mass percent as follows:

Cr 19.8%

Ni 0.3%

Mn 8.5%

C 0.026%

Rare-Earth Ce 0.10%

N 0.206%

S 0.004%

Si 0.5%

P 0.006%

B 0.001%

Fe surplus

Use the smelting process that tradition is conventional, before casting, rare earth intermediate alloy is put into.Calculate through comprehensive metering After founding with dispensing, moulding by casting, through forge hot and cold rolling, then through certain solution treatment, final preparing has the double of TRIP effect Phase stainless steel alloy material, the room temperature tensile fracture strength of this material is more than 850MPa, and yield strength is more than 500MPa, and fracture is prolonged Rate of stretching is more than 55%.

Embodiment 2

Cr 20.1%

Ni 0.3%

Mn 10.2%

C 0.028%

Rare-Earth Ce 0.10%

N 0.261%

Si 0.8%

S 0.002%

P 0.009%

B 0.002%

Fe surplus

Use the smelting process that tradition is conventional, before casting, rare earth intermediate alloy is put into.Calculate through comprehensive metering After founding with dispensing, moulding by casting, through forge hot, cold rolling, then through suitable solution treatment, final preparing has the double of TRIP effect Phase rustless steel, its room temperature tensile fracture strength is more than 850MPa, and yield strength is more than 500MPa, and fracture elongation is more than 65%.

Embodiment 3

Cr 20.8%

Ni 0.3%

Mn 11.5%

C 0.021%

Rare-Earth Ce 0.10%

N 0.35%

Si 0.5%

S 0.003%

P 0.007%

B 0.0015%

Fe surplus

Use the smelting process that tradition is conventional, before casting, rare earth intermediate alloy is put into.Calculate through comprehensive metering After founding with dispensing, moulding by casting, through forge hot and cold rolling, then through certain solution treatment, final preparing has the double of TRIP effect Phase stainless steel alloy material, its room temperature tensile fracture strength is more than 900MPa, and yield strength is more than 500MPa, and fracture elongation is big In 65%.

Such two-phase stainless Steel material have excellence plasticity, there is excellent corrosion resisting property simultaneously, can serve as automobile, The aspects such as general instruments engineering, are the optimal candidate materials replacing 304 series, the cost of raw material and minimizing can be greatly lowered Material usage.It addition, this material has preferable hot-workability in 850～1300 DEG C, there is the cold-workability of excellence simultaneously Energy.

Claims

1. an economical diphase stainless steel with phase transformation plasticization effect, it is characterised in that this two phase stainless steel has following Composition and mass percent: C≤0.03%, S≤0.03%, P≤0.03%, Cr:19.0～21.0%, Mn:8～12%, Ni: 0.1～0.5%, N:0.15 ~ 0.35%, Si≤1.0%, B:0.001～0.01%, Rare-Earth Ce or Y:0.005～0.20%, surplus For ferrum；This two phase stainless steel uses conventional smelting process, after dispensing is founded, moulding by casting, through forge hot, cold rolling, then Through solution treatment, the final prepared economical diphase stainless steel with phase transformation plasticization effect.