CN103276316A - Austenitic stainless steel and manufacturing method thereof - Google Patents
Austenitic stainless steel and manufacturing method thereof Download PDFInfo
- Publication number
- CN103276316A CN103276316A CN2013101851923A CN201310185192A CN103276316A CN 103276316 A CN103276316 A CN 103276316A CN 2013101851923 A CN2013101851923 A CN 2013101851923A CN 201310185192 A CN201310185192 A CN 201310185192A CN 103276316 A CN103276316 A CN 103276316A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- austenitic stainless
- content
- steel
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses austenitic stainless steel which comprises the chemical elements in percentage by weight: 0.03%-0.12% of C, 0.3%-1% of Si, 6.0%-8.5% of Mn, 16.0%-18.0% of Cr, 1.0%-2.0% of Ni, 0.10%-0.25% of N, 2.0%-3.5% of Cu, 0.1-0.5% of Mo, more than or equal to 10*10<-4>% and less than or equal to 30*10<-4>% of B, more than or equal to 30*10<-4>% and less than or equal to 60*10<-4>% of Ca, and the balance of Fe and inevitable impurities. The invention further discloses a manufacturing method for the austenitic stainless steel. On the premise of lowering the manufacturing cost of products, the austenitic stainless steel has good mechanical property, and excellent corrosion resistance property and cold machining performance, and is suitable to be applied in the fields of home appliances, building decoration, containers and the like, thus having wide market application prospects.
Description
Technical field
The present invention relates to a kind of metal alloy and manufacture method thereof, relate in particular to a kind of stainless steel and manufacture method thereof.
Background technology
304, austenitic stainless steels such as 316 are widely used in the every field of national economy because of its good mechanical property and corrosion resistance nature.The big ups and downs of nickel price have in recent years brought huge risk for the production of nickelic content austenitic stainless steels such as 304,316.Joint nickel even the austenitic stainless steel exploitation of not having nickel have been subjected to showing great attention to of people.There have been a plurality of nickel-saving type austenitic stainless steel products fields such as electrical article, freight container of being in to obtain widely using at present.But in order to reach the purpose that balances each other, nickel-saving type austenitic stainless steel tends to reduce the chromium element of certain content when composition designs, and this can make stainless corrosive nature be affected, and increases use cost.In addition, nickel-saving type austenitic stainless steel belongs to the meta austenitic stainless steel, and a large amount of strain-induced martensites makes the cold-forming property variation of material, has increased the manufacturing cost of product.
Open day on August 19th, 2009, publication number is CN101509104A, the Chinese patent literature that name is called " a kind of austenitic stainless steel with low content of nickel " relates to a kind of austenitic stainless steel with low content of nickel, and the one-tenth of this low nickel content austenitic stainless steel is grouped into and comprises: Cr:13～16.2%, Ni≤1.0%, Cu:1.0～2.2%, Mn:8.0～11.2%, N:0.1～0.2%, C:0.05～0.1%, Si:0.3～0.6%, surplus are Fe and other inevitable elements.The present invention is by the manganese with low price, and nitrogen comes the high price nickel element of instead of part, guarantees when reducing cost greatly that austenitic stainless steel has solidity to corrosion and cold and hot working performance preferably; Can also further improve stainless cold and hot working by adding a certain amount of B and Ca, avoid limit in the course of hot rolling to split appearance with M type defective.
Date of publication is on June 9th, 2010, publication No. is CN101724790A, the Chinese patent literature that name is called " a kind of low-nickel austenitic stainless steel and manufacture method thereof " discloses a kind of low-nickel austenitic stainless steel, and its chemical component weight degree is: C:0.05%～0.15%, Si≤1.0%, Mn:9.0%～10.0%, Cr:14%～16%, Ni:0.5%～1.0%, N:0.15%～0.25%, Cu:1.5%～2.0%, B:10 * 10
-4%～30 * 10
-4%, Ca:1 * 10
-4%～50 * 10
-4%, P＜0.03%, S＜0.02%, surplus is Fe and inevitable other impurity.
Date of publication is on January 12nd, 2011, publication No. is CN101942612A, the Chinese patent literature that name is called " a kind of low-nickel austenitic stainless steel with good corrosion resistance energy " discloses a kind of low-nickel austenitic stainless steel with good corrosion resistance energy, and the weight percent of its chemical ingredients (%) is: C:0.05～0.08; Si:0.3～0.6; Mn:8～10; Cr:14～16; Ni:2～3; S:0～0.01:P:0～0.045; N:0.1～0.15; Cu:1～2; Mo; 0.5～1.5; B:15～40ppm; Ca:10～30ppm, all the other are Fe and unavoidable impurities element.
Summary of the invention
One of purpose of the present invention provides a kind of austenitic stainless steel, this austenitic stainless steel is reducing under the prerequisite of adding the expensive alloys metal significantly, by to Mn, Cr, Ni, the composition design of alloying element such as N and Cu wishes that acquisition has the stainless steel of the single austenite structure of good cold working quality and good corrosion resistance energy.
Another object of the present invention provides a kind of manufacture method of austenitic stainless steel, it designs by reasonable component, be aided with means such as total oxygen content control, inclusion modification, be intended to reduce the quantity of hard inclusions thing in the steel, thereby improve the surface quality of cold-rolled products, improve the corrosion resistance nature of product simultaneously.
In order to reach the foregoing invention purpose, the invention provides a kind of austenitic stainless steel, its chemical element quality percentage composition is: C:0.03～0.12%; Si:0.3～1%; Mn:6.0～8.5%; Cr:16.0～18.0%; Ni:1.0～2.0%; N:0.10～0.25%; Cu:2.0～3.5%; Mo:0.1～0.5%; 10 * 10
-4%≤B≤30 * 10
-4%; 30 * 10
-4%≤Ca≤60 * 10
-4%; Surplus is Fe and other unavoidable impurities.
Each chemical composition design principle of austenitic stainless steel of the present invention is as follows:
(1) C:C is strong formation, the element of stablizing and enlarge the austenitic area, forms austenite structure under the room temperature of C and plays an important role.But, when C content is too high, can reduce stainless plasticity; And it is unfavorable to stainless solidity to corrosion.So C will have suitable percentage composition, so in the technical program content of C element is designed to 0.03～0.12wt%.
(2) Si:Si adds as reductor in the low-nickel austenitic stainless steel smelting process.When converter smelting, the content that keeps certain reduction Si in the steel is the effective measure that reduce total [O] content in the steel, the contriver is by discovering: when Si content greater than 0.3% the time, total [O] content in the molten steel can be reduced to below the 50ppm, can obtain the higher molten steel of purity.But Si is again ferrite former in stainless steel, at room temperature forms single-phase austenite structure in order to ensure stainless steel, the restriction that Si content is must be in addition certain.Therefore the technical program controls Si content at 0.3～1.0wt%.
(3) Mn:Mn is more weak austenite former.But be strong austenite structure stable element in stainless steel, and can improve the solubleness of N in steel.In low nickle type austenitic stainless steel, elements compounding effects such as C, N in Mn and the steel, part replaces Ni and guarantees that stainless steel at room temperature is austenite structure.But the solidity to corrosion of the austenitic stainless steel of Mn has negative impact, so Mn content can not be too high, so in the technical program content of Mn element is controlled to be 6.0～8.5wt%.
(4) Cr:Cr is most important alloying element in the stainless steel, is to obtain stainless rustless property and corrosion proof assurance.In the technical program, in 16～18wt% scope, making Cr content can not too high reason be in order to obtain austenite structure single under the room temperature with the control of Cr content.
(5) Ni:Ni forms and the mutually most important element of stable austenite, and can strengthen the ability of the anti-reductinic acid of stainless steel, and improves stainless processing characteristics.But because Ni is precious metal, in order to reduce production costs, thereby need reduce the design content of Ni greatly.The stainless steel that the technical program relates to is the nickel-saving type stainless steel, and Ni content is controlled at 1～2wt%.
(6) N:N is the element that forms, stablizes and enlarge the austenitic area very consumingly in stainless steel.N except substituting valuable alloying element, outside Ni, can also improve the intensity of material significantly under the prerequisite of not obvious reduction material plasticity and toughness in stainless steel,, rustless property and solidity to corrosion, and delay separating out of carbide in the stainless steel.But because the solubleness of N in stainless steel is limited, subsurface bubble appears in process of setting for fear of stainless steel, N content must be flux matched to guarantee that N exists with solid solution condition with containing of other alloying element, and in the technical program, the N element also needs to guarantee that with other alloying element compound action stainless steel at room temperature is single-phase austenite structure.Therefore, the content of N element is 0.10～0.25wt% in the technical program.
(7) Cu:Cu is the element that can improve the stainless steel cold-forming property.Along with the raising of Cu content, stainless cold working hardening index obviously descends.Cu content should remain on higher content in technical scheme, and Cu content is controlled to be 2.0～3.5wt%.
(8) Mo:Mo also is the important element that improves corrosion resistance nature in the stainless steel.Because the present invention need keep the Cr of certain content, therefore need carry out the Mo microalloying and handle and further improve corrosion resistance nature.In addition, the contriver finds that by a large amount of experiments the Mo of suitable content, the compound synergy of N element have a significant effect to improving stainless corrosion resistance nature, based on this, in the technical program Mo content are controlled to be 0.1～0.5wt%.
(9) Ca: molten steel is carried out the Ca processing can play Al in the steel
2O
3The effect of high-melting-point inclusion modification makes Al
2O
3Inclusion changes CaO-Al into
2O
3-SiO
2Compound inclusion.The contriver is by discovering: when the mass percent of CaO in the compound inclusion greater than 20% the time, the modified effect of steel inclusion is apparent in view.Therefore, according to the calculating of Al content in the molten steel, when the content of Ca element is above greater than 30ppm, can obtain ideal effect.In addition, the Ca element can not be too high, otherwise can cause CaO type impurity too much in the steel.So, Ca content is controlled to be 30 * 10
-4%～60 * 10
-4%.
(10) B: add a certain amount of B element and handle carrying out microalloying in the steel, can further improve hot workability and the polishing performance of product.Thereby the B constituent content is designed to 10 * 10 in the technical program
-4%～30 * 10
-4%.
Generally speaking, owing to reduced the content of Ni element in the austenitic stainless steel of the present invention significantly, therefore in order to improve cold-forming property, need the collaborative interpolation by Cu, Mn, three kinds of elements of N, make Md30/50 (α ') be down to (Md30/50 (α ') refers to that the cold deformation of true strain amount 30% produces the martensitic temperature of formation 50% α ') below 20 ℃.Meanwhile, in order to improve the solubleness of N element in the steel, thereby improve the anti-pitting attack performance of product, need to add a certain amount of Cr, Mn element.But in order to guarantee that stainless steel forms single austenite structure, Cr content can not be too high, so Cr, Mn, three elements of N also must collaboratively add.
Correspondingly, the present invention also provides the manufacture method of above-mentioned austenitic stainless steel, and wherein: in the external refining step, guarantee that refining time is no less than 40min, the soft churning time of argon gas is no less than 10min, and adopts Ca to handle and carry out modification.
In the external refining step, guarantee refining and the soft churning time of argon gas of enough time, can impel the abundant come-up of inclusion in the molten steel, improve the molten steel purity.And for the high-melting-point Al that may exist in the steel
2O
3Be mingled with, handle by Ca and carry out modification, can reduce the high-melting-point inclusion to the influence of properties for follow, improve the surface quality of finished product, be conducive to improve corrosion resistance nature.
Compared with prior art, austenitic stainless steel of the present invention is significantly reducing under the prerequisite of using noble metal Ni, has single austenite structure, possess good cold-forming property and excellent corrosion resisting performance, alternative 304 stainless steels carry out widespread use in fields such as thermal container, tame electrical articles.
The manufacture method of austenitic stainless steel of the present invention, by the total oxygen content in the control molten steel, guarantee refining time and the soft churning time of argon gas, carry out the inclusion modified method, reduced the quantity of hard inclusions thing in the steel, reduced the influence to properties for follow, improve the surface quality of cold-rolled products, increased the corrosion resistance nature of product, improved the hot workability of product, promote the product polishing performance, reduced cost of goods manifactured and use cost.
Description of drawings
Fig. 1 has shown the cold working curve that chamber gradient cold rolling method is by experiment drawn out.
Embodiment
Following specific embodiment comes austenitic stainless steel of the present invention and manufacture method thereof are described further.
Embodiment 1-5
Make austenitic stainless steel of the present invention according to following step:
Take the two-step approach of electric furnace, AOD to smelt, reduction Si content is greater than 0.3%, so that total oxygen content [O]＜50ppm in the smelting process control molten steel.LF station refining time is not less than 40min.The soft churning time of Argon is not less than 10min.Carry out Ca processing, B microalloying at LF station terminal point, make the content control of Ca element in the molten steel at 30～60ppm, the content of B element is controlled at 10～30ppm.Molten steel obtains slab through continuous casting, and slab moves back pickling, cold rolling, coldly moves back the band steel that the 2B condition of surface is produced in pickling through hot rolling, heat again.
Table 1 has shown the chemical ingredients proportioning of each austenitic stainless steel of embodiment 1-5.
Table 1(wt%, surplus is Fe and other unavoidable impurities)
Table 2 has shown LF refining time and the soft churning time of Argon among the technical program embodiment 1-5.
Table 2
Table 3 has shown the traditional performance index of the austenitic stainless steel that embodiment 1-5 is related.
Table 3
| Sequence number | R p0.2(MPa) | R m(MPa) | A 50mm(%) | Md30/50(℃) | E p(mV) |
| Embodiment 1 | 395 | 810 | 54 | 2.4 | 251 |
| Embodiment 2 | 380 | 785 | 53 | -55 | 265 |
| Embodiment 3 | 405 | 850 | 54 | 13 | 244 |
| Embodiment 4 | 385 | 790 | 57 | 10.6 | 223 |
| Embodiment 5 | 395 | 815 | 55 | 19.1 | 250 |
Annotate: A50mm is that the tension specimen gauge length is the unit elongation of 50mm, and Ep refers to the pitting attack current potential of material
As shown in Table 3, the austenitic stainless steel that embodiment 1-5 is related, its Rp0.2 〉=380Mpa, Rm 〉=785Mpa, A
50mm＞50%, Md30/50＜20 ℃, Ep 〉=250mV, illustrated and reduced valuable alloying element significantly, reduce greatly under the prerequisite of material cost, the technical program is by rational alloy designs and be aided with the improvement of manufacturing process, makes the austenitic stainless steel of producing still have favorable mechanical performance and higher plastic property, and is easy to shape.
Except the traditional performance index of the listed austenitic stainless steel of table 3, the contriver has also carried out following test respectively to verify its performance for the austenitic stainless steel of each embodiment:
1) utilize metallographic method that the inclusion grade of implementing in the austenitic stainless steel in 1 is evaluated, evaluating basis is GB/T10561-2005, and the inclusion evaluation result of the embodiment 1 that obtains is referring to table 4.
Table 4
As can be seen from Table 4, the The amount of inclusions in the austenitic stainless steel among the embodiment 1 is few.This shows, can obtain the molten steel of high cleanliness by the manufacture method of austenitic stainless steel of the present invention, be conducive to improve the corrosion resistance nature of material.
2) carry out the pitting attack performance test of material according to the embodiment 2 of GB/T17897-1999, the measuring point corrosive nature test result of embodiment 2 and with the comparison of 304 stainless test results referring to table 5.
Table 5
| Type of stainless steel | The rate of weight loss of material (g/m^2*h) |
| The embodiment of the invention 2 | 5.89 |
| 304 stainless steels | 5.81 |
As can be seen from Table 5, the anti-pitting attack performance of the austenitic stainless steel of embodiment 2 shows that near 304 stainless steels it has excellent corrosion resisting performance, can substitute 304 stainless steels in production application.
3) carry out the sulfurous gas condensation experiment of material according to the embodiment 3 of GB/T9789-1988, the corrosion resistance nature of experimental material in the reductibility corrosive medium, the sulfurous gas condensation experimental result of embodiment 3 and with the comparison of 304 stainless experimental results referring to table 6.
Table 6
As shown in Table 6, the austenitic stainless steel of embodiment 3 embodies excellent corrosion resistance nature in reductant, and corrosion weight loss rate is lower than 304 stainless steels.
4) chamber gradient cold rolling method is drawn out embodiment 4 and 304 stainless cold working curves as shown in Figure 1 by experiment, as can be seen, the preliminary work hardening rate of steel of the present invention is substantially close to 304 stainless steels, under 70% cold deformation amount, strain-induced martensite content in the steel only is 15%, far below 304 stainless steels, embody material and have excellent cold-forming property.
In sum, according to the above description with the related experiment result, shown that austenitic stainless steel of the present invention is under the prerequisite that has reduced cost of goods manifactured, has the favorable mechanical performance, higher plastic property, superior corrosion resistance energy, excellent cold-forming property, product price ratio height is fit to be applied to fields such as tame electrical article, building decoration and freight container, has wide market application prospect.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (2)
1. an austenitic stainless steel is characterized in that, its chemical element quality percentage composition is: C:0.03～0.12%; Si:0.3～1%; Mn:6.0～8.5%; Cr:16.0～18.0%; Ni:1.0～2.0%; N:0.10～0.25%; Cu:2.0～3.5%; Mo:0.1～0.5%; 10 * 10
-4%≤B≤30 * 10
-4%; 30 * 10
-4%≤Ca≤60 * 10
-4%; Surplus is Fe and other unavoidable impurities.
2. the manufacture method of austenitic stainless steel as claimed in claim 1 is characterized in that, in the external refining step, guarantees that refining time is no less than 40min, and the soft churning time of argon gas is no less than 10min, and adopts Ca to handle and carry out modification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101851923A CN103276316A (en) | 2013-05-17 | 2013-05-17 | Austenitic stainless steel and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101851923A CN103276316A (en) | 2013-05-17 | 2013-05-17 | Austenitic stainless steel and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103276316A true CN103276316A (en) | 2013-09-04 |
Family
ID=49058928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101851923A Pending CN103276316A (en) | 2013-05-17 | 2013-05-17 | Austenitic stainless steel and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103276316A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112608A (en) * | 2015-09-23 | 2015-12-02 | 宝钢德盛不锈钢有限公司 | Method and product for improving polishing property of nickel-saving austenitic stainless steel |
| CN108677110A (en) * | 2018-05-25 | 2018-10-19 | 江苏理工学院 | A kind of economy type austenitic stainless steel and its manufacturing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724790A (en) * | 2008-10-23 | 2010-06-09 | 宝山钢铁股份有限公司 | Low-nickel austenitic stainless steel and manufacturing method thereof |
| CN101775560A (en) * | 2009-01-14 | 2010-07-14 | 宝山钢铁股份有限公司 | Nickel-saving austenitic stainless steel and production method thereof |
| CN102337481A (en) * | 2010-07-20 | 2012-02-01 | 宝山钢铁股份有限公司 | Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof |
-
2013
- 2013-05-17 CN CN2013101851923A patent/CN103276316A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724790A (en) * | 2008-10-23 | 2010-06-09 | 宝山钢铁股份有限公司 | Low-nickel austenitic stainless steel and manufacturing method thereof |
| CN101775560A (en) * | 2009-01-14 | 2010-07-14 | 宝山钢铁股份有限公司 | Nickel-saving austenitic stainless steel and production method thereof |
| CN102337481A (en) * | 2010-07-20 | 2012-02-01 | 宝山钢铁股份有限公司 | Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112608A (en) * | 2015-09-23 | 2015-12-02 | 宝钢德盛不锈钢有限公司 | Method and product for improving polishing property of nickel-saving austenitic stainless steel |
| CN108677110A (en) * | 2018-05-25 | 2018-10-19 | 江苏理工学院 | A kind of economy type austenitic stainless steel and its manufacturing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104711493B (en) | Nickel-saving type contains rare earth and barium diphase stainless steel alloy material and preparation method thereof | |
| CN101613839B (en) | High nitrogen and low nickel duplex stainless steel and manufacturing method thereof | |
| CN103866194B (en) | Stanniferous low gap ferritic stainless steel of a kind of unusual segregation and preparation method thereof | |
| CN103521946A (en) | High-strength austenitic stainless steel submerged-arc welding wire | |
| CN102337481A (en) | Molybdenum-containing nickel-saving austenitic stainless steel with excellent corrosion resistance and manufacturing method thereof | |
| CN103540864B (en) | Corrosion-resistant stainless steel coffee pot material and preparation method thereof | |
| CN102605291A (en) | Ni-saving austenitic stainless steel cold-rolled sheet with excellent processability and manufacturing method thereof | |
| CN109852885B (en) | Duplex stainless steel and preparation method thereof | |
| CN103447348A (en) | Manufacturing method of stainless steel wire | |
| CN103317256A (en) | Austenitic stainless steel submerged-arc welding wire with excellent high-temperature strength | |
| CN102943219B (en) | Nickel-saving austenitic stainless steel containing manganese, nitrogen and boron and fabrication method | |
| CN104131237A (en) | Economic type diphasic stainless steel with good toughness and weldability and manufacturing method thereof | |
| CN104152818A (en) | Duplex stainless steel and preparation method thereof | |
| CN102230136B (en) | Austenitic stainless steel and manufacturing method thereof | |
| CN105420621A (en) | Austenitic stainless steel used for anti-high-temperature furnace pipe and manufacturing process for plate blank thereof | |
| CN101768702B (en) | Medium-chromium ferrite stainless steel for automobile with high formability and acidic corrosion resistance as well as manufacturing method thereof | |
| CN103205653A (en) | Duplex stainless steel with excellent thermoplasticity and corrosion resistance and manufacturing method thereof | |
| CN102021480B (en) | Manufacturing method of low-chromium ferritic stainless steel | |
| CN107904520A (en) | A kind of diphase stainless steel alloy material and its manufacture method | |
| CN101775551A (en) | Manufacture method of novel marine corrosion resistance stainless steel and steel cable thereof | |
| CN102650024A (en) | Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate | |
| CN103540863A (en) | Low-cost austenitic stainless steel with high corrosion resistance | |
| CN103276316A (en) | Austenitic stainless steel and manufacturing method thereof | |
| CN106978575A (en) | A kind of excellent two phase stainless steel of low nickel chromium triangle processing characteristics and its production technology | |
| CN100535167C (en) | High ductility nickel-free ferrite stainless steel and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130904 |