CN105080968A - Rolling method for super duplex stainless steel continuous casting billet - Google Patents
Rolling method for super duplex stainless steel continuous casting billet Download PDFInfo
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- CN105080968A CN105080968A CN201510257200.XA CN201510257200A CN105080968A CN 105080968 A CN105080968 A CN 105080968A CN 201510257200 A CN201510257200 A CN 201510257200A CN 105080968 A CN105080968 A CN 105080968A
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- continuous casting
- casting billet
- stainless steel
- duplex stainless
- super
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 96
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 title abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000003801 milling Methods 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims description 2
- 239000006104 solid solution Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 5
- 238000000227 grinding Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- -1 briny environment Substances 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Metal Rolling (AREA)
Abstract
The invention discloses a rolling method for super duplex stainless steel continuous casting billet. The rolling method comprises the steps of producing the continuous casting billet, and performing air cooling on the continuous casting billet; putting the continuous casting billet into a first preheating furnace for preheating and performing air cooling on the preheated continuous casting billet; putting the continuous casting billet into a second preheating furnace for preheating, and performing air cooling on the preheated continuous casting billet; putting the continuous casting billet into a grinder for all-grinding; putting the continuous casting billet into a heating furnace for heating; and delivering the continuous casting billet into a mill for milling. According to the rolling method for the super duplex stainless steel continuous casting billet, the technological process for steel billet production is simplified, and huge investment is reduced; the metal yield and the finished product ratio are improved, the finished product ratio is improved to 88.25% from the previous 75.02%, and the cost is reduced.
Description
Technical field
The invention belongs to metallurgical technology field, particularly relate to a kind of production method of super-duplex stainless steel continuous casting billet milling.
Background technology
S32750 and S32760 belongs to third generation two phase stainless steel, be referred to as super-duplex stainless steel, it is existing that oneself includes ASTMA182 (S32750 in, S32760), the stainless steel product standard such as ASTMA479 (S32750, S32760), EN10272 (1.4410) and Chinese GB/T20878.Wherein, S32750 and S32760 two phase stainless steel has higher intensity and good toughness, and there is excellent resistance to spot corrosion (anti-spot corrosion equivalent PREN>40), anticorrosion stress-resistant and slit and corrosion resistant ability, show excellent combination property, be used widely in the environment such as heat exchanger, cooler, evaporimeter and the pipeline of its product in oil refining, petrochemical industry, chemical industry for making chlorine and alkali, briny environment, chemical fertilizer industry and the rotten environment of other high chlorine.
At present, the production at home of S32750 and S32760 super-duplex stainless steel is all the traditional processing technology adopting " die casting smelting-forging and stamping/rolling-cogging-tandem rolling ", and result in production cycle when producing this kind of stainless steel long, metallurgical cost is high.
Specifically, under S32750 and S32760 super-duplex stainless steel room temperature, austenite and ferritic Phase Proportion are generally at about 40%-60%, and in its hot procedure, two-phase proportion can vary with temperature and change; Austenite is different with ferritic thermal processing distortion behavior, easily anisotropy occurs and cracks at phase boundary place; When temperature at about 950 DEG C and constant temperature time, part ferrite divides and parses sigma phase, and sigma phase may cause occurring micro-crack.Thus, producing similar steel grade is for a long time all that so just cause metal lumber recovery low, metallurgical manufacturing cost is high first with forging and stamping or rolling-cogging and then enter tandem mill and carry out tandem rolling.
Summary of the invention
The object of the present invention is to provide a kind of with short production cycle, metal lumber recovery is high, effectively can to reduce the metallurgical continuous casting billet milling method manufacturing the super-duplex stainless steel of production cost.
For achieving the above object, the concrete technical scheme of the continuous casting billet milling method of a kind of super-duplex stainless steel of the present invention is:
A continuous casting billet milling method for super-duplex stainless steel, comprising:
Produce continuous casting billet, and air cooling process is carried out to continuous casting billet;
Continuous casting billet is put into the first preheating furnace and carry out the pre-heat treatment, and air cooling process is carried out to the continuous casting billet after preheating;
Continuous casting billet is put into the second preheating furnace and carry out the pre-heat treatment, and air cooling process is carried out to the continuous casting billet after preheating;
Continuous casting billet is put into sharpening machine and carries out complete wear process;
Continuous casting billet is put into heating furnace heat;
Continuous casting billet is transported in milling train and is rolled.
The advantage of the continuous casting billet milling method of super-duplex stainless steel of the present invention is:
1) technique is simple, workable, and organization of production is convenient;
2) production cycle shortens dramatically;
3) metal lumber recovery improves;
4) metallurgical manufacturing cost significantly reduces.
Accompanying drawing explanation
Fig. 1 is Hot Charging of Continuous Casting Slab process in the present invention and rolling mill practice flow chart;
Fig. 2 is the first preheating furnace heating temperature profile figure in the present invention;
Fig. 3 is the second preheating furnace heating temperature profile figure in the present invention;
Fig. 4 is the continuous casting billet temperature profile in heating furnace in the present invention.
Detailed description of the invention
In order to better understand object of the present invention, structure and function, below in conjunction with accompanying drawing, further detailed description is done to the continuous casting billet milling method of a kind of super-duplex stainless steel of the present invention.
As shown in Figure 1, the continuous casting billet milling method of super-duplex stainless steel of the present invention comprises the following steps (be the square billet producing 180mm × 180mm with continuous casting in the present embodiment, the round steel of Rolling Production φ 65mm-φ 90mm is that example is described):
First, produce super-duplex stainless steel continuous casting billet, and air cooling process is carried out to continuous casting billet.
Secondly, continuous casting billet is put into the first preheating furnace and carry out the pre-heat treatment, and air cooling process is carried out to the continuous casting billet after preheating.Wherein, continuous casting billet is put into the step that the first preheating furnace carries out the pre-heat treatment to comprise: before putting into continuous casting billet, the temperature in the first preheating furnace is risen to 350 DEG C-450 DEG C; After putting into continuous casting billet, the temperature in the first preheating furnace is risen to 700 DEG C-800 DEG C with the speed of 50-80 DEG C/h, and is incubated 4.5h.
The acting as of this step in the present invention: 1) the pre-heat treatment can change the ferrite form in continuous casting billet, break ferritic cellular dendrite structure, it is made to become discontinuous island structure from continuous print network structure, when ferritic morphologic appearance is continuous print structure, material damage will be expanded continuously along the netted pine-tree structure of ferrite, and when ferrite becomes the island structure of dispersion, damage can only in island internal extended, and the continuity hindering its expansion is conducive to the operation of rolling in later stage like this; 2) component segregation in continuous casting billet can be made well to be improved by the pre-heat treatment, also just be equivalent to do the process that homogenizes, be conducive to the rolling in later stage like this.
Then, continuous casting billet is put into the second preheating furnace and carry out the pre-heat treatment, and air cooling process is carried out to the continuous casting billet after preheating.Wherein, continuous casting billet is put into the step that the second preheating furnace carries out the pre-heat treatment to comprise: before putting into continuous casting billet, the temperature in the second preheating furnace is risen to 900 DEG C-1100 DEG C; After putting into continuous casting billet, the temperature in the second preheating furnace is risen to 1220 DEG C-1260 DEG C with the speed of 80 DEG C-100 DEG C/h, and is incubated 7.5h.In the present invention, the effect of this step is identical with above-mentioned the pre-heat treatment effect in first time preheating furnace.
Then, continuous casting billet is put into sharpening machine and carries out complete wear process, guarantee continuous casting billet surface zero defect.Wherein, due to continuous casting in the present embodiment produce for square continuous casting billet, therefore need to be circular arc, to ensure that continuous casting billet bight temperature drop in the operation of rolling is unlikely to too fast, thus to avoid the phenomenon occurring corner crack in continuous casting billet milling process by the bight reconditioning of square continuous casting billet.
Then, continuous casting billet is put into heating furnace to heat.Wherein, continuous casting billet is put into the step that heating furnace carries out heating to comprise: preheating, temperature≤700 DEG C, time 1.5h; Heating, temperature 1250 DEG C-1270 DEG C, time 1.5h; Soaking, temperature 1240 DEG C-1260 DEG C, time 1h.In addition, the heating furnace in the present embodiment is preferably walking beam heating furnace.
Then, continuous casting billet is transported in milling train is rolled.Wherein, continuous casting billet is transported to the step be rolled in milling train to comprise: the roll in milling train is preheated to 150 DEG C and (is specially: before rolling, roughing mill speed improves as far as possible, speed governing is carried out before rolling this steel grade, breaker roll carries out preheating in advance in addition, allows boiling water cooling roll when often propping up steel gap); Continuous casting billet is transported in milling train and is rolled, finishing temperature > 1020 DEG C.In addition, speed when continuous casting billet is come out of the stove from heating furnace is preferably 110% of the speed of continuous casting billet on roller-way, is rolled to make continuous casting billet nip as soon as possible in milling train.
Finally, the steel rolled out in milling train are carried out air cooling process, and the steel after air cooling are put into solid solution furnace carry out solution treatment, temperature is 1050 DEG C-1080 DEG C.
The continuous casting billet milling method of super-duplex stainless steel of the present invention rolls out qualified super-duplex stainless steel round steel by " continuous casting-the pre-heat treatment-complete wear-tandem rolling " technique, so that the later stage is rolled into seamless pipe circular pipe blank further, not only solve the problem that production cycle is long, metal lumber recovery is low faced when producing this steel grade, and greatly reduce the metallurgical production cost manufactured, fully meet user and require and market demand.
Further describe invention has been by specific embodiment above; but it should be understood that; here concrete description; should not be construed as the restriction to the spirit and scope of the invention; one of ordinary skilled in the art to the various amendments that above-described embodiment is made, belongs to the scope that the present invention protects after reading this specification.
Claims (9)
1. a continuous casting billet milling method for super-duplex stainless steel, is characterized in that, comprising:
Produce continuous casting billet, and air cooling process is carried out to continuous casting billet;
Continuous casting billet is put into the first preheating furnace and carry out the pre-heat treatment, and air cooling process is carried out to the continuous casting billet after preheating;
Continuous casting billet is put into the second preheating furnace and carry out the pre-heat treatment, and air cooling process is carried out to the continuous casting billet after preheating;
Continuous casting billet is put into sharpening machine and carries out complete wear process;
Continuous casting billet is put into heating furnace heat;
Continuous casting billet is transported in milling train and is rolled.
2. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, is characterized in that, continuous casting billet is put into the step that the first preheating furnace carries out the pre-heat treatment and comprises:
Before putting into continuous casting billet, the temperature in the first preheating furnace is risen to 350 DEG C-450 DEG C;
After putting into continuous casting billet, the temperature in the first preheating furnace is risen to 700 DEG C-800 DEG C with the speed of 50-80 DEG C/h, and is incubated 4.5h.
3. the continuous casting billet milling method of super-duplex stainless steel according to claim 1 and 2, is characterized in that, continuous casting billet is put into the step that the second preheating furnace carries out the pre-heat treatment and comprises:
Before putting into continuous casting billet, the temperature in the second preheating furnace is risen to 900 DEG C-1100 DEG C;
After putting into continuous casting billet, the temperature in the second preheating furnace is risen to 1220 DEG C-1260 DEG C with the speed of 80 DEG C-100 DEG C/h, and is incubated 7.5h.
4. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, is characterized in that, continuous casting billet is put into the step that heating furnace carries out heating and comprises:
Preheating, temperature≤700 DEG C, time 1.5h;
Heating, temperature 1250-1270 DEG C, time 1.5h;
Soaking, temperature 1240-1260 DEG C, time 1h.
5. the continuous casting billet milling method of super-duplex stainless steel according to claim 4, is characterized in that, continuous casting billet being put into the heating furnace that heating furnace carries out the step heated is walking beam heating furnace.
6. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, is characterized in that, continuous casting billet is transported to the step be rolled in milling train and comprises:
Roll in milling train is preheated to 150 DEG C;
Continuous casting billet is transported in milling train and is rolled, finishing temperature > 1020 DEG C.
7. the continuous casting billet milling method of super-duplex stainless steel according to claim 6, is characterized in that, speed when continuous casting billet is come out of the stove from heating furnace is 110% of the speed of continuous casting billet on roller-way.
8. the continuous casting billet milling method of the super-duplex stainless steel according to claim 1 or 6, is characterized in that, also comprise:
The steel rolled out in milling train are carried out air cooling process;
Steel are put into solid solution furnace and carries out solution treatment, temperature is 1050 DEG C-1080 DEG C.
9. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, is characterized in that,
Producing the continuous casting billet produced in the step of continuous casting billet is square steel billets;
Continuous casting billet being put into the bight that sharpening machine carries out the square continuous casting billet of step of complete wear process wants reconditioning to be circular arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257200.XA CN105080968B (en) | 2015-05-19 | 2015-05-19 | A kind of continuous casting billet milling method of super-duplex stainless steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510257200.XA CN105080968B (en) | 2015-05-19 | 2015-05-19 | A kind of continuous casting billet milling method of super-duplex stainless steel |
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| CN105080968A true CN105080968A (en) | 2015-11-25 |
| CN105080968B CN105080968B (en) | 2017-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111482567A (en) * | 2020-04-09 | 2020-08-04 | 邯郸钢铁集团有限责任公司 | Production process for improving cold machining cracking of steel for hot-rolled gear shaft |
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| JPS5935620A (en) * | 1982-08-24 | 1984-02-27 | Kawasaki Steel Corp | Method for preventing cracking of hot coil of austenitic stainless steel having two-phase structure |
| JPS61154703A (en) * | 1984-12-26 | 1986-07-14 | Kawasaki Steel Corp | Manufacture of two-phase stainless steel stock |
| JPH1046291A (en) * | 1996-08-01 | 1998-02-17 | Hitachi Ltd | Heat treatment for dual phase stainless steel |
| CN1182801A (en) * | 1996-10-15 | 1998-05-27 | 阿维达·谢菲尔德公司 | Method for manufacturing stainless steel band |
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| CN103286128A (en) * | 2013-05-30 | 2013-09-11 | 山西太钢不锈钢股份有限公司 | Super duplex stainless steel S32750 medium plate rolling process |
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2015
- 2015-05-19 CN CN201510257200.XA patent/CN105080968B/en active Active
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|---|---|---|---|---|
| JPS5935620A (en) * | 1982-08-24 | 1984-02-27 | Kawasaki Steel Corp | Method for preventing cracking of hot coil of austenitic stainless steel having two-phase structure |
| JPS61154703A (en) * | 1984-12-26 | 1986-07-14 | Kawasaki Steel Corp | Manufacture of two-phase stainless steel stock |
| JPH1046291A (en) * | 1996-08-01 | 1998-02-17 | Hitachi Ltd | Heat treatment for dual phase stainless steel |
| CN1182801A (en) * | 1996-10-15 | 1998-05-27 | 阿维达·谢菲尔德公司 | Method for manufacturing stainless steel band |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111482567A (en) * | 2020-04-09 | 2020-08-04 | 邯郸钢铁集团有限责任公司 | Production process for improving cold machining cracking of steel for hot-rolled gear shaft |
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| CN105080968B (en) | 2017-10-27 |
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Denomination of invention: A rolling method for continuous casting billets of super duplex stainless steel Granted publication date: 20171027 Pledgee: China Construction Bank Qingtian Sub branch Pledgor: ZHEJIANG TSINGSHAN IRON & STEEL Co.,Ltd. Registration number: Y2024980014337 |