CN105080968B - A kind of continuous casting billet milling method of super-duplex stainless steel - Google Patents
A kind of continuous casting billet milling method of super-duplex stainless steel Download PDFInfo
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- CN105080968B CN105080968B CN201510257200.XA CN201510257200A CN105080968B CN 105080968 B CN105080968 B CN 105080968B CN 201510257200 A CN201510257200 A CN 201510257200A CN 105080968 B CN105080968 B CN 105080968B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 93
- 238000003801 milling Methods 0.000 title claims abstract description 34
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000006104 solid solution Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 9
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal 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
- 239000000126 substance Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 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
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a kind of continuous casting billet milling method of super-duplex stainless steel, the milling method includes：Continuous casting billet is produced, and air cooling processing is carried out to continuous casting billet；Continuous casting billet is put into the first preheating furnace and carries out the pre-heat treatment, and air cooling processing is carried out to the continuous casting billet after preheating；Continuous casting billet is put into the second preheating furnace and carries out the pre-heat treatment, and air cooling processing is carried out to the continuous casting billet after preheating；Continuous casting billet is put into progress complete wear processing in sharpening machine；Continuous casting billet is put into heating furnace and heated；Continuous casting billet is transported in milling train and rolled.The continuous casting billet milling method of the super-duplex stainless steel of the present invention simplifies the technological process of bloom production, saves great amount of investment, improves recovery rate of iron and lumber recovery, lumber recovery is promoted to 88.25% from 75.02% before, reduces cost.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of producer of super-duplex stainless steel continuous casting billet milling
Method.
Background technology
S32750 and S32760 belong to third generation two phase stainless steel, referred to as super-duplex stainless steel, and existing oneself includes ASTM
A182 (S32750, S32760), ASTM A479 (S32750, S32760), EN10272 (1.4410) and China GB/T 20878
Deng stainless steel product standard.Wherein, S32750 and S32760 two phase stainless steels have higher intensity and good toughness, and have
There is excellent resistance to spot corrosion (anti-spot corrosion equivalent PREN>40), anticorrosion stress-resistant and slit and corrosion resistant ability, show excellent synthesis
Performance, heat 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 is handed over
It is used widely in the environment such as parallel operation, cooler, evaporator and pipeline.
At present, the production of S32750 and S32760 super-duplex stainless steels at home all be using " molding smelting-forging and stamping/
The traditional processing technology of rolling-cogging-tandem rolling ", the production cycle is long when result in this kind of stainless steel of production, and metallurgical cost is high.
Specifically, austenite and ferritic Phase Proportion are general at room temperature for S32750 and S32760 super-duplex stainless steels
Two-phase proportion can be varied with temperature and changed in 40%-60% or so, its hot procedure；Austenite and ferritic
Thermal processing distortion behavior is different, easily occurs anisotropy and is cracked at phase boundary；When temperature is in 950 DEG C or so and constant temperature
When, part ferrite, which is decomposed, separates out sigma phase, and sigma phase may cause micro-crack occur.Thus, produce for a long time
Similar steel grade be all first with forge and press or rolling-cogging then enter again tandem mill carry out tandem rolling, so result in metal lumber recovery
Low, metallurgical manufacturing cost is high.
The content of the invention
Object of the present invention is to provide a kind of with short production cycle, metal lumber recovery is high, metallurgical system can be effectively reduced
Make the continuous casting billet milling method of the super-duplex stainless steel of production cost.
To achieve the above object, the particular technique side of the continuous casting billet milling method of a kind of super-duplex stainless steel of the invention
Case is：
A kind of continuous casting billet milling method of super-duplex stainless steel, including：
Continuous casting billet is produced, and air cooling processing is carried out to continuous casting billet；
Continuous casting billet is put into the first preheating furnace and carries out the pre-heat treatment, and air cooling processing is carried out to the continuous casting billet after preheating；
Continuous casting billet is put into the second preheating furnace and carries out the pre-heat treatment, and air cooling processing is carried out to the continuous casting billet after preheating；
Continuous casting billet is put into progress complete wear processing in sharpening machine；
Continuous casting billet is put into heating furnace and heated；
Continuous casting billet is transported in milling train and rolled.
The advantage of the continuous casting billet milling method of the 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 is improved；
4) metallurgical manufacturing cost is greatly lowered.
Brief description of the drawings
Fig. 1 is the Hot Charging of Continuous Casting Slab processing 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 temperature profiles in heating furnace for the continuous casting billet in the present invention.
Embodiment
In order to be better understood by the purpose of the present invention, structure and function, below in conjunction with the accompanying drawings, to a kind of super of the present invention
The continuous casting billet milling method of two phase stainless steel does further detailed description.
As shown in figure 1, the continuous casting billet milling method of the super-duplex stainless steel of the present invention comprises the following steps (the present embodiment
In be with continuous casting 180mm × 180mm square billet, to be illustrated exemplified by Rolling Production φ 65mm-φ 90mm round steel)：
First, super-duplex stainless steel continuous casting billet is produced, and air cooling processing is carried out to continuous casting billet.
Secondly, continuous casting billet is put into the first preheating furnace and carries out the pre-heat treatment, and air cooling is carried out to the continuous casting billet after preheating
Processing.Wherein, continuous casting billet is put into the first preheating furnace into the step of carrying out the pre-heat treatment includes：, will before continuous casting billet is put into
Temperature in first preheating furnace rises to 350 DEG C -450 DEG C；After continuous casting billet is put into, by the temperature in the first preheating furnace with 50-
80 DEG C/h speed rises to 700 DEG C -800 DEG C, and is incubated 4.5h.
This in present invention step is act as：1) the pre-heat treatment can change the ferrite form in continuous casting billet, break iron
The cellular dendrite structure of ferritic, makes it be changed into discontinuous island structure from continuous network structure, when ferritic form table
Material damage will continuously extend along the netted pine-tree structure of ferrite when being now continuous structure, and when ferrite is changed into scattered
Island structure when, continuity that damage in island internal extended, can only hinder its extension is so conducive to the rolling in later stage
Process；2) by the pre-heat treatment the component segregation in continuous casting billet can be made to be improved well, is also equivalent to make one
Homogenize process, is so conducive to the rolling in later stage.
Then, continuous casting billet is put into the second preheating furnace and carries out the pre-heat treatment, and air cooling is carried out to the continuous casting billet after preheating
Processing.Wherein, continuous casting billet is put into the second preheating furnace into the step of carrying out the pre-heat treatment includes：, will before continuous casting billet is put into
Temperature in second preheating furnace rises to 900 DEG C -1100 DEG C；After continuous casting billet is put into, by the temperature in the second preheating furnace with 80
DEG C -100 DEG C/h speed rises to 1220 DEG C -1260 DEG C, and is incubated 7.5h.The effect of the step of this in the present invention with it is above-mentioned first
The pre-heat treatment effect in secondary preheating furnace is identical.
Then, continuous casting billet is put into progress complete wear processing in sharpening machine, it is ensured that continuous casting billet surface zero defect.Wherein, due to
In the present embodiment continuous casting go out for square continuous casting billet, therefore it is in circular arc to need the corner reconditioning of square continuous casting billet, so as to
Ensure that continuous casting billet corner temperature drop in the operation of rolling is unlikely to too fast, so as to avoid the occurrence of corner crack during continuous casting billet milling
Phenomenon.
Then, continuous casting billet is put into heating furnace and heated.Wherein, continuous casting billet is put into heating furnace and added
The step of heat treatment, includes：Preheating, temperature≤700 DEG C, time 1.5h；Heating, 1250 DEG C -1270 DEG C of temperature, time 1.5h；
Heat, 1240 DEG C -1260 DEG C of temperature, 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 and rolled.Wherein, continuous casting billet is transported to what is rolled in milling train
Step includes：Roll in milling train is preheated into 150 DEG C (is specially：Before rolling, roughing mill speed is tried one's best raising, rolls the steel grade
Preceding carry out speed governing, is preheated to roll in advance in addition, allows boiling water to cool down roll when every steel gap)；Continuous casting billet is defeated
It is sent in milling train and is rolled, 1020 DEG C of finishing temperature ＞.In addition, speed when continuous casting billet is come out of the stove from heating furnace is preferably to connect
The 110% of speed of the strand on roller-way, is rolled to make continuous casting billet bite as soon as possible in milling train.
Finally, the steel rolled out in milling train are subjected to air cooling processing, and the steel after air cooling is put into solid solution furnace
Row solution treatment, temperature is 1050 DEG C -1080 DEG C.
The continuous casting billet milling method of the super-duplex stainless steel of the present invention uses " continuous casting-the pre-heat treatment-complete wear-tandem rolling "
Technique rolls out qualified super-duplex stainless steel round steel, so that the later stage is further rolled into seamless pipe circular pipe blank, not only solves
The production cycle length that is faced when producing the steel grade, the problem of metal lumber recovery is low, and substantially reduce the life of metallurgical manufacture
Cost is produced, user is fully met and requires and market needs.
The present invention is further described by specific embodiment above, it should be understood that, here specifically
Description, should not be construed as the restriction to the spirit and scope of the invention, and one of ordinary skilled in the art is reading this explanation
The various modifications made after book to above-described embodiment, belong to the scope that the present invention is protected.
Claims (7)
1. a kind of continuous casting billet milling method of super-duplex stainless steel, it is characterised in that including：
Continuous casting billet is produced, and air cooling processing is carried out to continuous casting billet；
Continuous casting billet is put into the first preheating furnace and carries out the pre-heat treatment, and air cooling processing is carried out to the continuous casting billet after preheating；
Continuous casting billet is put into the second preheating furnace and carries out the pre-heat treatment, and air cooling processing is carried out to the continuous casting billet after preheating；
Continuous casting billet is put into progress complete wear processing in sharpening machine；
Continuous casting billet is put into heating furnace and heated；
Continuous casting billet is transported in milling train and rolled；
Continuous casting billet is put into the first preheating furnace into the step of carrying out the pre-heat treatment includes：
Before continuous casting billet is put into, the temperature in the first preheating furnace is risen to 350 DEG C -450 DEG C；
After continuous casting billet is put into, the temperature in the first preheating furnace is risen to 700 DEG C -800 DEG C with 50-80 DEG C/h speed, and
It is incubated 4.5h；
Continuous casting billet is put into the second preheating furnace into the step of carrying out the pre-heat treatment includes：
Before continuous casting billet is put into, the temperature in the second preheating furnace is risen to 900 DEG C -1100 DEG C；
After continuous casting billet is put into, the temperature in the second preheating furnace is risen to 1220 DEG C -1260 with 80 DEG C -100 DEG C/h speed
DEG C, and it is incubated 7.5h.
2. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, it is characterised in that put continuous casting billet
Entering the step of being heated in heating furnace includes：
Preheating, temperature≤700 DEG C, time 1.5h；
Heating, 1250-1270 DEG C of temperature, time 1.5h；
Soaking, 1240-1260 DEG C of temperature, time 1h.
3. the continuous casting billet milling method of super-duplex stainless steel according to claim 2, it is characterised in that put continuous casting billet
It is walking beam heating furnace to enter the heating furnace in the step of being heated in heating furnace.
4. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, it is characterised in that continuous casting billet is defeated
Being sent to the step of being rolled in milling train includes：
Roll in milling train is preheated to 150 DEG C；
Continuous casting billet is transported in milling train and rolled, 1020 DEG C of finishing temperature ＞.
5. the continuous casting billet milling method of super-duplex stainless steel according to claim 4, it is characterised in that continuous casting billet is from adding
Speed when being come out of the stove in hot stove is the 110% of speed of the continuous casting billet on roller-way.
6. the continuous casting billet milling method of the super-duplex stainless steel according to claim 1 or 4, it is characterised in that also include：
The steel rolled out in milling train are subjected to air cooling processing；
Steel are put into solid solution furnace and carry out solution treatment, temperature is 1050 DEG C -1080 DEG C.
7. the continuous casting billet milling method of super-duplex stainless steel according to claim 1, it is characterised in that
The continuous casting billet produced in the step of production continuous casting billet is square steel billets；
Reconditioning is wanted to be in circular arc in the corner that continuous casting billet is put into square continuous casting billet in the step of carrying out complete wear processing in sharpening machine.
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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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| SE508892C2 (en) * | 1996-10-15 | 1998-11-16 | Avesta Sheffield Ab | Process for making a stainless steel strip |
| CN101648211B (en) * | 2009-09-10 | 2012-01-18 | 山西太钢不锈钢股份有限公司 | Rolling method of dual-phase stainless steel hot continuous rolled coil |
| CN102808074B (en) * | 2012-08-15 | 2013-09-25 | 太原钢铁(集团)有限公司 | Casting blank heat treatment method of stainless steel welding strip for nuclear power |
| CN103286128B (en) * | 2013-05-30 | 2015-05-20 | 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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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 |
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