CN101994068A - Austenitic stainless steel plate and manufacture method thereof - Google Patents
Austenitic stainless steel plate and manufacture method thereof Download PDFInfo
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Abstract
The invention provides an austenitic stainless steel plate which is composed of the following chemical compositions in percentage by weight: less than or equal to 0.03% of C, 0.3-1.0 % of Si, 0.8-2.0% of Mn, less than or equal to 0.003% of S, less than or equal to 0.03 % of P, 16.0-20.0% of Cr, 10.0-14.0% of Ni, 1.0-3.0% of Mo, less than or equal to 0.08% of N, less than or equal to 0.004% of O, 0.005-0.01% of optional Ca and/ or 0.001-0.003 % of optional B and the balance of Fe and other inevitable impurities, wherein the weight percentage of Ni, Mn, N, C, Cr, Mo and Si also satisfies that the content of ferrite delta in the steel plate is less than 3%. Correspondingly, the invention also provides a manufacture method of the austenitic stainless steel plate. By the technical scheme, the austenitic stainless steel plate of the invention has good surface quality and does not have the surface defects, such as liner scale, inclusion, peeling, crazes and the like.
Description
Technical field
The present invention relates to the stainless steel production field, especially, relate to a kind of austenite stainless steel plate and manufacture method thereof with favorable surface quality.
Background technology
Cr-Ni series austenitic stainless steel is widely used in fields such as oil, chemical industry, pressurized vessel, aerospace and the energy owing to all have good plasticity and toughness, cold and hot working performance and excellent corrosion resisting performance under high temperature and low temperature.
And than Cr-Ni series austenitic stainless steel, Cr-Ni-Mo series austenitic stainless steel has better anti-dilute sulphuric acid, phosphoric acid, acetic acid, formic acid, urea and anti-muriate pitting performance, therefore its cold-reduced sheet, high value added product anti-corrosion and have purposes widely as height, be used for chemical industry, pressure vessel industries in large quantities, as interchanger, jar case liner, electrolytic anode plate and tubulation etc.
Cold-reduced sheet is except mechanical property, corrosive nature to material claim, and also the surface quality to steel plate has proposed very high requirement, because favorable surface quality can further guarantee the solidity to corrosion of material.But because the raising of the alloying element content ratio of Cr-Ni-Mo series austenitic stainless steel, the surface quality that how to guarantee steel plate is one of present production difficult point.
For Cr-Ni-Mo series austenitic stainless steel, traditional technology all is to control from the purity of steel aspect, improve the surface quality of steel plate, and the composition of the alloying element in the less consideration steel plate is to the influence of its surface quality at present.
In addition, in the existing smelting process of Cr-Ni-Mo series austenitic stainless steel, generally only adopt argon oxygen decarburization (Argon Oxygen Decarburization, AOD) technology is carried out the Si deoxidation, this be difficult to realize the smelting to the higher steel grade of O and S content requirement.
Summary of the invention
The technical problem that the present invention solves provides a kind of austenitic stainless steel steel plate and manufacture method thereof, and described austenitic stainless steel steel plate has favorable surface quality, does not have the line squama, is mingled with, surface imperfection such as peeling, minute crack.
For addressing the above problem, the invention provides a kind of austenitic stainless steel steel plate, the mass percent of its chemical ingredients is: C :≤0.03, Si:0.3～1.0, Mn:0.8～2.0, S :≤0.003, P :≤0.03, Cr:16.0～20.0, Ni:10.0～14.0, Mo:1.0～3.0, N :≤0.08, O :≤0.004, all the other are Fe and other unavoidable impurities; In the described steel plate mass percent of Ni, Mn, N, C, Cr, Mo and Si also need satisfy make ferrite δ in the described steel plate content less than 3%.
The principle of technique scheme is if there is too much ferrite content in the steel plate based on austenite, and the two-phase thermal expansivity is different with mechanical property, can cause defectives such as surface of steel plate forms the line squama, is mingled with, peeling, minute crack, thereby influence the surface quality of steel plate.In addition, too much ferrite also can reduce the hot-workability and the pitting resistance of steel plate, so the control of the ferrite content in the austenitic stainless steel steel plate becomes an important indicator.In the present invention, the calculation formula of the degree of ferrite δ is: δ=3 * (Mo+Cr)+4.5 * Si-2.8 * Ni-1.8 * Mn-88 * (C+N)-18.5.Wherein, Ni, Mn, N and C belong to the nickel equivalent forming element, and Cr, Mo and Si belong to the chromium equivalent forming element.
Because the purity and the entire oxygen content in the steel content of molten steel are closely related, and total oxygen content shows as the content that takes off S in S difficulty or ease and the final molten steel the most intuitively.If the content of S is higher in the steel, then the sulfide of Xing Chenging enters the matrix crystal boundary of steel plate easily, destroys bonding between lattice, causes intergranular cracking easily in the operation of rolling of steel plate, forms tiny tiny crack on the surface of steel plate.Usually can be distributed in two edges of plate portion and middle part, promptly form so-called crackle shape line squama.Therefore, need carry out certain control to the content of O in the steel plate and S.
Alternatively, comprise also in the described steel plate that mass percent is 0.005～0.01 Ca.
In molten steel, pass through to add proper C a element meeting nodularization sulfide inclusion, and make the dystectic Al in the molten steel
2O
3Inclusion becomes low-melting CaO-Al
2O
3Inclusion, thus help floating foreign.
Alternatively, comprise also in the described steel plate that mass percent is 0.001～0.003 B.
Certain B content can increase the forming core point of austenitic stainless steel in process of setting, and can increase grain-boundary strength, thereby can prevent owing to the different Surface Defects in Steel Plate that cause of the plasticity between austenite and the ferrite phase boundary.
The present invention also provides a kind of manufacture method of austenitic stainless steel steel plate, comprise: in the molten steel smelting process, adopt argon oxygen decarburization and vacuum-oxygen decarbonizing (Vacuum OxygenDecarburization successively, VOD) duplex deoxidization technique, in argon oxygen decarburization technology, adopt Si to carry out deoxidation, adopt Si and Al to carry out complex deoxidization in vacuum-oxygen decarbonizing technology, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%; In the hot-rolled steel plate process, tapping temperature is 1200～1280 ℃, determines by 1～1.5min/mm steel billet thickness heat-up time.
For austenitic stainless steel of the present invention, its single phase region is at 1200～1280 ℃, and at this single phase region scope internal heating, along with the prolongation of heat-up time, the ferrite content in the as cast condition can reduce gradually.And when Heating temperature is not in this single phase region, in heat-processed, can separate out ferritic phase in the austenite structure again again, thereby be unfavorable for the surface quality control of steel plate.
But, determine by 1～1.5min/mm steel billet thickness heat-up time in the single phase region heating.Because if heat-up time is long, will cause the ferrite in the austenite steel plate to disappear, will separate out crystal boundary and be dissolved in element sulphur in the ferrite at the austenite steel plate.These sulfide are low melting component, can fusings in steel plate heating or rolling process, thus form tiny crack at surface of steel plate.If but heat-up time is too short, can cause steel billet center and surface temperature inequality, increase the hot rolled difficulty.
Alternatively, the Si content after the described argon oxygen decarburization technology is controlled to be 0.05～0.30%.
Since the Si content indirect reaction of reduction back molten steel reduction deoxidation situation, therefore abundant in order to ensure reduction deoxidation in the AOD technology, realize deep deoxidation, so the Si content after the reduction of AOD technology is controlled, mainly be in order to realize sufficient silicon deoxidation.
Alternatively, the addition of Al is controlled to be≤4.5kg/ ton steel in the described vacuum-oxygen decarbonizing technology.
For reduce thoroughly and desulfurization abundant, the present invention has adopted the complex deoxidization technological measure, i.e. employing Si and the compound deep deoxidation of Al in VOD technology, wherein the addition of Al is controlled to be≤4.5kg/ ton steel.Though because Al has very strong deoxidizing capacity, it can increase rigid inclusion and strip inclusion in the molten steel, thereby can influence the surface quality and the mechanical property of steel plate.
Alternatively, described manufacture method also is included in the vacuum-oxygen decarbonizing technology later stage, adds the CaSiBa line in molten steel.
Alternatively, described CaSiBa line makes that the mass percent of Ca reaches 0.005～0.01 in the molten steel.
Alternatively, described manufacture method also is included in the vacuum-oxygen decarbonizing technology later stage, adds the FeB line in molten steel.
Alternatively, described FeB line makes the mass percent of B in molten reach 0.001～0.003.
Alternatively, after vacuum-oxygen decarbonizing technology finishes, adopt argon gas that molten steel is carried out the soft stirring of 15～40min, help inclusion floating, thereby obtain purified molten steel.
Compared with prior art, the present invention has the following advantages: in the molten steel smelting process, adopt the duplex deoxidization technique of argon oxygen decarburization and vacuum-oxygen decarbonizing successively, and adjust the chemical ingredients of molten steel, the content that makes its ferrite δ is less than 3%.Control the tapping temperature of corresponding course of hot rolling and heat-up time in addition, make austenitic stainless steel steel plate of the present invention have favorable surface quality, do not have the line squama, be mingled with, surface imperfection such as peeling, minute crack.
The CaSiBa line that comprises the Ca element by interpolation in molten steel helps the nodularization sulfide inclusion, and makes the dystectic Al in the molten steel
2O
3Inclusion becomes low-melting CaO-Al
2O
3Inclusion, thus help floating foreign.
The FeB line that comprises the B element by interpolation in molten steel can increase the forming core point of austenitic stainless steel in process of setting, and can increase grain-boundary strength, thereby can prevent owing to the different Surface Defects in Steel Plate that cause of the plasticity between austenite and the ferrite phase boundary.
Description of drawings
Fig. 1 is the method flow synoptic diagram of the manufacturing austenitic stainless steel steel plate of one embodiment of the present of invention;
The photo of the flawless austenitic stainless steel steel plate of surface quality that Fig. 2 obtains for first embodiment of the present invention;
The photo of the defective austenitic stainless steel steel plate of surface quality that Fig. 3 obtains for the embodiment that compares with first embodiment of the present invention;
The photo of the flawless austenitic stainless steel steel plate of surface quality that Fig. 4 obtains for second embodiment of the present invention;
The photo of the defective austenitic stainless steel steel plate of surface quality that Fig. 5 obtains for the embodiment that compares with second embodiment of the present invention;
Fig. 6 is the photo of the 3rd the flawless austenitic stainless steel steel plate of the surface quality that embodiment obtains of the present invention;
Fig. 7 is the photo of the 4th the flawless austenitic stainless steel steel plate of the surface quality that embodiment obtains of the present invention.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings, but should not limit protection scope of the present invention with this.
Fig. 1 is the method flow synoptic diagram of the manufacturing austenitic stainless steel steel plate of one embodiment of the present of invention.As shown in Figure 1, comprise: performing step S201, in the molten steel smelting process, adopt the duplex deoxidization technique of argon oxygen decarburization and vacuum-oxygen decarbonizing successively, in argon oxygen decarburization technology, adopt Si to carry out deoxidation, adopt Si and Al to carry out complex deoxidization in vacuum-oxygen decarbonizing technology, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%; Performing step S202, in the hot-rolled steel plate process, tapping temperature is 1200～1280 ℃, determines by 1～1.5min/mm steel billet thickness heat-up time.
In the present invention, the calculation formula between the degree of ferrite δ and each chemical ingredients is: δ=3 * (Mo+Cr)+4.5 * Si-2.8 * Ni-1.8 * Mn-88 * (C+N)-18.5.
Embodiment 1
In the present embodiment, the mass percent of the chemical ingredients of austenitic stainless steel steel plate is as follows:
| C | Mn | Si | S | P | Cr | Ni | Mo | N | O |
| 0.029 | 1.8 | 0.41 | 0.001 | 0.03 | 17.8 | 11.9 | 2.01 | 0.035 | 0.003 |
All the other are Fe and other unavoidable impurities
In the molten steel smelting process, adopt the duplex deoxidization technique of argon oxygen decarburization (AOD) and vacuum-oxygen decarbonizing (VOD) successively, in AOD technology, adopt Si to carry out deoxidation, in VOD technology, adopt Si and Al to carry out complex deoxidization, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%.
In the present embodiment, the Si content after the AOD technology is controlled to be 0.15%, and the addition of Al is controlled to be 0.9kg/ ton steel in the VOD technology, and total oxygen content is controlled to be 0.003%.
In the present embodiment, also add CaSiBa line and FeB line respectively in the VOD technology later stage in molten steel, make that the mass percent of Ca reaches 0.005% in the molten steel, the mass percent of B reaches 0.002%.
In the present embodiment, before tapping, also molten steel is carried out the soft stirring of 20min, be cast into the thick continuously cast bloom of 200mm subsequently with argon gas.Continuously cast bloom is heated at 1250 ℃ through after the reconditioning, and be 240min heat-up time, carries out hot rolling.The cold rolling flawless austenitic stainless steel steel plate of surface quality that obtains after the annealed pickling, as shown in Figure 2.
In order to compare, with the continuously cast bloom after the reconditioning 1300 ℃ of heating, be 450min heat-up time, then through the strip defective occurring at surface of steel plate after the hot-roll annealing pickling, peeling can appear after cold rolling, thereby can not get the flawless austenitic stainless steel steel plate of surface quality, shown in circled among Fig. 3.
Embodiment 2
In the present embodiment, the mass percent of the chemical ingredients of austenitic stainless steel steel plate is as follows:
| C | Mn | Si | S | P | Cr | Ni | Mo | N | O |
| 0.022 | 1.65 | 0.48 | 0.001 | 0.02 | 16.1 | 10.2 | 2.3 | 0.061 | 0.0038 |
All the other are Fe and other unavoidable impurities
In the molten steel smelting process, adopt the duplex deoxidization technique of AOD and VOD successively, in AOD technology, adopt Si to carry out deoxidation, in VOD technology, adopt Si and Al to carry out complex deoxidization, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%.
In the present embodiment, the Si content after the AOD technology is controlled to be 0.25%, and the addition of Al is controlled to be 3.5kg/ ton steel in the VOD technology, and total oxygen content is controlled to be 0.0038%.
In the present embodiment, also add CaSiBa line and FeB line respectively in the VOD technology later stage in molten steel, make that the mass percent of Ca reaches 0.007% in the molten steel, the mass percent of B reaches 0.0011%.
In the present embodiment, before tapping, also molten steel is carried out the soft stirring of 35min, be cast into the thick continuously cast bloom of 200mm subsequently with argon gas.Continuously cast bloom is heated at 1255 ℃ through after the reconditioning, and be 240min heat-up time, carries out hot rolling.The cold rolling flawless austenitic stainless steel steel plate of surface quality that obtains after the annealed pickling, as shown in Figure 4.
In order to compare, adjust the mass percent of the chemical ingredients of molten steel as follows:
| C | Mn | Si | S | P | Cr | Ni | Mo | N | O |
| 0.017 | 1.21 | 0.52 | 0.002 | 0.02 | 16.1 | 10.05 | 2.01 | 0.03 | 0.005 |
All the other are Fe and other unavoidable impurities
Adopt then that same technology is smelted, casting, rolling, wherein also add CaSiBa line and FeB line respectively in the VOD technology later stage in molten steel, make that the mass percent of Ca reaches 0.006% in the molten steel, the mass percent of B reaches 0.002%.The wire crackle has appearred in the surface of resulting austenitic stainless steel steel plate, shown in circled among Fig. 5.
Embodiment 3
In the present embodiment, the mass percent of the chemical ingredients of austenitic stainless steel steel plate is as follows:
| C | Mn | Si | S | P | Cr | Ni | Mo | N | O |
| 0.012 | 1.00 | 0.8 | 0.003 | 0.02 | 18.8 | 12.6 | 1.5 | 0.07 | 0.004 |
All the other are Fe and other unavoidable impurities
In the molten steel smelting process, adopt the duplex deoxidization technique of AOD and VOD successively, in AOD technology, adopt Si to carry out deoxidation, in VOD technology, adopt Si and Al to carry out complex deoxidization, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%.
In the present embodiment, the Si content after the AOD technology is controlled to be 0.17%, and the addition of Al is controlled to be 0.7kg/ ton steel in the VOD technology, and total oxygen content is controlled to be 0.004%.
In the present embodiment, also add CaSiBa line and FeB line respectively in the VOD technology later stage in molten steel, make that the mass percent of Ca reaches 0.008% in the molten steel, the mass percent of B reaches 0.0029%.
In the present embodiment, before tapping, also molten steel is carried out the soft stirring of 17min, be cast into the thick continuously cast bloom of 200mm subsequently with argon gas.Continuously cast bloom is heated at 1260 ℃ through after the reconditioning, and be 220min heat-up time, carries out hot rolling.The cold rolling flawless austenitic stainless steel steel plate of surface quality that obtains after the annealed pickling, as shown in Figure 6.
Embodiment 4
In the present embodiment, the mass percent of the chemical ingredients of austenitic stainless steel steel plate is as follows:
| C | Mn | Si | S | P | Cr | Ni | Mo | N | O |
| 0.025 | 1.7 | 0.5 | 0.002 | 0.028 | 16.5 | 10.5 | 2.5 | 0.04 | 0.035 |
All the other are Fe and other unavoidable impurities
In the molten steel smelting process, adopt the duplex deoxidization technique of AOD and VOD successively, in AOD technology, adopt Si to carry out deoxidation, in VOD technology, adopt Si and Al to carry out complex deoxidization, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%.
In the present embodiment, the Si content after the AOD technology is controlled to be 0.2%, and the addition of Al is controlled to be 0.65kg/ ton steel in the VOD technology, and total oxygen content is controlled to be 0.0035%.
In the present embodiment, also add CaSiBa line and FeB line respectively in the VOD technology later stage in molten steel, make that the mass percent of Ca reaches 0.006% in the molten steel, the mass percent of B reaches 0.0016%.
In the present embodiment, before tapping, also molten steel is carried out the soft stirring of 25min, be cast into the thick continuously cast bloom of 200mm subsequently with argon gas.Continuously cast bloom is heated at 1266 ℃ through after the reconditioning, and be 230min heat-up time, carries out hot rolling.The cold rolling flawless austenitic stainless steel steel plate of surface quality that obtains after the annealed pickling, as shown in Figure 7.
The present invention adopts the duplex deoxidization technique of argon oxygen decarburization and vacuum-oxygen decarbonizing successively in the molten steel smelting process, and adjusts the chemical ingredients of molten steel, and the content that makes its ferrite δ is less than 3%.Control the tapping temperature of corresponding course of hot rolling and heat-up time in addition, make austenitic stainless steel steel plate of the present invention have favorable surface quality, do not have the line squama, be mingled with, surface imperfection such as peeling, minute crack.
The CaSiBa line that comprises the Ca element by interpolation in molten steel helps the nodularization sulfide inclusion, and makes the dystectic Al in the molten steel
2O
3Inclusion becomes low-melting CaO-Al
2O
3Inclusion, thus help floating foreign.
The FeB line that comprises the B element by interpolation in molten steel can increase the forming core point of austenitic stainless steel in process of setting, and can increase grain-boundary strength, thereby can prevent owing to the different Surface Defects in Steel Plate that cause of the plasticity between austenite and the ferrite phase boundary.
Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (9)
1. austenitic stainless steel steel plate, the mass percent of its chemical ingredients is:
C：≤0.03，
Si：0.3～1.0，
Mn：0.8～2.0，
S：≤0.003，
P：≤0.03，
Cr：16.0～20.0，
Ni：10.0～14.0，
Mo：1.0～3.0，
N：≤0.08，
O :≤0.004 and
Optionally, 0.005～0.01 Ca and/or 0.001～0.003 B,
All the other are Fe and other unavoidable impurities;
In the described steel plate mass percent of Ni, Mn, N, C, Cr, Mo and Si also need satisfy make ferrite δ in the described steel plate content less than 3%.
2. method of making austenitic stainless steel steel plate as claimed in claim 1 comprises:
In the molten steel smelting process, adopt the duplex deoxidization technique of argon oxygen decarburization and vacuum-oxygen decarbonizing successively, in argon oxygen decarburization technology, adopt Si to carry out deoxidation, in vacuum-oxygen decarbonizing technology, adopt Si and Al to carry out complex deoxidization, adjust the chemical ingredients of molten steel simultaneously, the content that makes its ferrite δ is less than 3%;
In the hot-rolled steel plate process, tapping temperature is 1200～1280 ℃, determines by 1～1.5min/mm steel billet thickness heat-up time.
3. the manufacture method of austenitic stainless steel steel plate according to claim 2 is characterized in that, the Si content after the described argon oxygen decarburization technology is controlled to be 0.05～0.30%.
4. according to the manufacture method of claim 2 or 3 described austenitic stainless steel steel plates, it is characterized in that the addition of Al is controlled to be≤4.5kg/ ton steel in the described vacuum-oxygen decarbonizing technology.
5. the manufacture method of austenitic stainless steel steel plate according to claim 4 is characterized in that, described manufacture method also is included in the vacuum-oxygen decarbonizing technology later stage, adds the CaSiBa line in molten steel.
6. the manufacture method of austenitic stainless steel steel plate according to claim 5 is characterized in that, described CaSiBa line makes that the mass percent of Ca reaches 0.005～0.01 in the molten steel.
7. the manufacture method of austenitic stainless steel steel plate according to claim 4 is characterized in that, described manufacture method also is included in the vacuum-oxygen decarbonizing technology later stage, adds the FeB line in molten steel.
8. the manufacture method of austenitic stainless steel steel plate according to claim 7 is characterized in that, described FeB line makes the mass percent of B in molten reach 0.001～0.003.
9. according to the manufacture method of claim 5 or 6 described austenitic stainless steel steel plates, it is characterized in that, after vacuum-oxygen decarbonizing technology finishes, adopt argon gas molten steel to be carried out the soft stirring of 15～40min.
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| CN109554609A (en) * | 2017-09-26 | 2019-04-02 | 宝钢不锈钢有限公司 | Exempt from the austenitic heat-resistance steel and its manufacturing method of peeling in a kind of surface |
| CN109554609B (en) * | 2017-09-26 | 2022-03-15 | 宝钢德盛不锈钢有限公司 | Surface peeling-free austenitic heat-resistant steel and manufacturing method thereof |
| CN112805398A (en) * | 2018-09-13 | 2021-05-14 | 株式会社Posco | Austenitic stainless steel having excellent pipe expandability and age-crack resistance |
| US11959159B2 (en) | 2018-09-13 | 2024-04-16 | Posco Co., Ltd | Austenitic stainless steel having excellent pipe-expandability and age cracking resistance |
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| CN115466909A (en) * | 2022-10-26 | 2022-12-13 | 浦项(张家港)不锈钢股份有限公司 | Austenitic stainless steel, preparation process and application |
| CN115466909B (en) * | 2022-10-26 | 2023-03-24 | 浦项(张家港)不锈钢股份有限公司 | Austenitic stainless steel, preparation process and application |
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