CN106363020A - Method for producing high-strength hot-rolled strip steel with thickness being 1.2 mm through CSP process - Google Patents
Method for producing high-strength hot-rolled strip steel with thickness being 1.2 mm through CSP process Download PDFInfo
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- CN106363020A CN106363020A CN201610750985.9A CN201610750985A CN106363020A CN 106363020 A CN106363020 A CN 106363020A CN 201610750985 A CN201610750985 A CN 201610750985A CN 106363020 A CN106363020 A CN 106363020A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
Abstract
The invention relates to a method for producing high-strength hot-rolled strip steel with the thickness being 1.2 mm through a CSP process. According to the application conditions, the order thickness of common container steel ranges from 1.6 mm to 3.0 mm, the high-strength order thickness is required to be 1.2 mm, and the difference between the order width of the common container steel and the order width of high-strength strip steel does not exceed 10 mm; common container steel of a first furnace is firstly smelted, the Mn content of the common container steel is controlled according to a set upper limit value, and smelting is carried out starting from a second furnace according to high-strength strip steel components; continuous casting for blank forming is achieved; cast blanks are rolled after being subjected to heating and high-pressure descaling; and after laminar cooling, rolling is carried out, and stand-by application is achieved. According to the method, similar-section common container steel and high-strength strip steel mixed casting production is achieved, the common container steel is used as a transition material of the high-strength strip steel, and therefore the risk that the high-strength strip steel generates the production accidents such as waste steel and casting break is greatly reduced, and the problem that the high-strength strip steel has no transition material is solved; and implementation is easy, and the cost of ton steel can be reduced by 6%.
Description
Technical field
The present invention relates to a kind of high-strength hot-rolled strip steel production method of Ultra-thin, specifically belong to a kind of adopt csp work
Skill produces the method that thickness is the high-strength hot-rolled strip steel of 1.2mm, and it is applied to production yield strength >=700mpa, thickness specification is
The high-strength hot-rolled strip steel of 1.2mm.
Background technology
For improving csp producing line product competitiveness, successfully develop yield strength >=700mpa, thickness specification is
The high-strength hot-rolled strip steel of 1.2mm.This variety steel has good mechanics and processability due to it, in container production enterprise
Industry is used widely, thus having promoted container industry product up-gradation and industry restructuring.But there is order in this variety steel
Thickness specification is single, no transition material demand problem, and that is, client only orders the high-strength container steel that thickness is 1.2mm, does not have
The demand of other thickness.
At present, market is all using the mode of fixing output quota by sales, i.e. based on contract tissue production.Therefore, if adopting the existing life of csp
Produce the high-strength hot-rolled strip steel of mode of manufacture, then producing ideally, be transitioned into 1.2mm thickness from 3.0mm thickness open rolling,
Singly pouring time transition material needs 10 pieces, about 110 tons of weight, is that band is produced entirely, it can only carry out spot sale.With 1.2mm thickness
High-intensity band steel price is compared, and the high-intensity band steel stock price of other thickness specifications is averagely per ton to reduce about 800 yuan, is unfavorable for
Lift the profitability of this variety steel.Due also to high-intensity band steel is individually opened to pour is transitioned into 1.2mm from 3.0mm thickness open rolling, send out
Raw steel scrap, the disconnected risk production accident such as pouring are larger, have a strong impact on this variety steel and produce stable and quality control.
Content of the invention
The invention reside in overcoming the deficiencies in the prior art, provide a kind of csp producing line can produce yield strength >=
700mpa, thickness specification are 1.2mm high-intensity band steel, can solve the problems, such as high-intensity band steel no transition material again, lift its profit
Ability, reduces production cost, and can make the good high-strength hot-rolled strip steel economical production method of rolling stability.
Realize the measure of above-mentioned purpose:
A kind of employing csp technique productions thickness is the method for the high-strength hot-rolled strip steel of 1.2mm, and it is: its step:
1) applicable elements: general container steel order thickness requirement in 1.6 ~ 3.0mm, high intensity order thickness requirement is
1.2mm；General container steel order width is differed with high-intensity band steel order width and is less than 10mm；
2) first smelt a stove general container steel, the content of its mn is controlled by the higher limit setting, and carries out external refining；
Start to be smelted by high-intensity band steel composition from the 2nd stove, and carry out external refining；
3) it is casting continuously to form base: general container steel leaves and pours thickness of strand is 70mm, and the general container steel poured into a mould is from second piece
Strand starts to the strand of follow-up casting, all using wick-containing pressure reduction slab thickness to 55mm；
When high-intensity band steel molten steel and general container molten steel mix and pour, continuous casting production tonnage is controlled according to 25 tons；
Begin with high-intensity band steel mould flux in mixed pouring；When controlling mixed pouring, casting machine pulling rate is in 3.6-3.8m/min；
When mixed pour end after, casting machine casting speed control is in 4.0-4.3m/min；
4) strand is heated and high pressure descaling after rolled: general container steel thickness is gradually transitions from 3.0mm open rolling
It may be assumed that 3.0mm thickness rolls 2 pieces, 2.0mm thickness rolls 2 pieces to 1.6mm, and 1.6mm thickness rolls 4 pieces；
The thickness of high-intensity band steel is gradually transitions 1.2mm it may be assumed that 1.4mm thickness rolls 1 piece from 1.4 mm, and 1.3mm thickness rolls
1 piece, subsequently all roll the high-intensity band steel of 1.2mm thickness；
Regard as mixing with first 2 pieces of high-intensity band steel for last 1 piece of general container steel and pour base, and as waste disposal；
5) batched after section cooling, stand-by after cooling.
It is: described high-intensity band steel means high-strength hot-rolled strip steel.
Because general container steel mn weight percent content is 0.45～0.60%, high-intensity band steel mn percentage by weight
Content is 1.50 ~ 1.75%, and the two difference is larger, qualified for guaranteeing the high-intensity band steel composition after mixed pouring, so application claims
In general container smelting molten steel, the higher limit of the mn that the content of its mn sets according to this steel is controlled, but can not exceed
Allowed band, remaining composition and mixed pour after high-intensity band steel water constituent all according to normal setup control.
Mix when pouring the transit time being to shorten different steel grade chemical compositions, guaranteeing to make on the premise of contract material performance is qualified
Mixed base weight of pouring is minimum, and continuous casting production mixes and pours tonnage by 25 tons of controls.Last 1 piece of general container steel and high-intensity band steel
First 2 pieces regard as mixed pour base, and as waste disposal, be because this 3 pieces of Steel Properties are unqualified, be not inconsistent with contract requirement.
The present invention compared with prior art, by optimizing csp existing high-intensity band steel production organization mode it is achieved that similar
Section (order width deviation is less than 10mm) general container steel is mixed with high-intensity band steel and pours production, and general container steel is made
For the transition material of high-intensity band steel, it is transitioned into 1.6mm thickness from 3.0mm thickness open rolling, thus greatly reducing high-intensity band steel
Produce and steel scrap, the disconnected risk production accident such as pouring occur, solve the problems, such as high-intensity band steel no transition material, lift this variety steel
While profitability, improve Ultra-thin high-intensity band steel rolling stability and quality control level, and easy enforcement, ton steel
Can reduces cost 6%.
Brief description
The high-intensity band steel that Fig. 1 produces for present invention metallographic structure figure at room temperature；
The transmission electron microscope picture of the high-intensity band steel that Fig. 2 produces for the present invention.
Specific embodiment
Below the present invention is described in detail:
In following embodiment: general container steel mn weight percent content is 0.45～0.60%；High-intensity band steel mn weight
Degree is 1.50 ~ 1.75%, and yield strength requires to be more than 700mpa, and tensile strength requires to be more than 750 mpa, elongation percentage
Require to be more than 12%.
Embodiment 1
A kind of employing csp technique productions thickness is the method for the high-strength hot-rolled strip steel of 1.2mm, its step:
1) applicable elements: general container steel order thickness requirement in 1.6 ~ 3.0mm, high-intensity band steel order thickness requirement is
1.2mm；General container steel order width differs 5mm with high-intensity band steel order width；
2) first smelt a stove general container steel, the content of its mn is controlled by the higher limit 0.58% setting, and carries out outside stove
Refine；Start to be smelted by high-intensity band steel composition from the 2nd stove, and carry out external refining；
3) it is casting continuously to form base: general container steel leaves and pours thickness of strand is 70mm, and the general container steel poured into a mould is from second piece
Strand begin with wick-containing pressure reduce slab thickness arrive 55mm, afterwards slab thickness holding constant；
When high-intensity band steel molten steel and general container molten steel mix and pour, continuous casting production tonnage is controlled according to 25 tons；
Begin with high-strength steel mould flux in mixed pouring；When controlling mixed pouring, main frame pulling rate is in 3.6m/min；
When mixed pour end after, casting machine casting speed control is in 4.2m/min；
4) strand is heated and high pressure descaling after rolled: general container steel thickness is gradually transitions from 3.0mm open rolling
It may be assumed that 3.0mm thickness rolls 2 pieces, 2.0mm thickness rolls 2 pieces to 1.6mm, and 1.6mm thickness rolls 4 pieces；
The thickness of high-intensity band steel is gradually transitions 1.2mm it may be assumed that 1.4mm thickness rolls 1 piece from 1.4 mm, and 1.3mm thickness rolls
1 piece, subsequently all roll the high-intensity band steel of 1.2mm thickness；
Regard as mixing with first 2 pieces of high-intensity band steel for last 1 piece of general container steel and pour base, and as waste disposal；
5) batched after section cooling, stand-by after cooling.
After testing, the mechanical property of the 1.2mm thick and high-strength degree strip steel being rolled is: yield strength is 712 mpa,
Tensile strength is 790 mpa, and elongation percentage is 14.2%, fully meets order user requirement.
Embodiment 2
A kind of employing csp technique productions thickness is the method for the high-strength hot-rolled strip steel of 1.2mm, its step:
1) applicable elements: general container steel order thickness requirement in 1.6 ~ 3.0mm, high-intensity band steel order thickness requirement is
1.2mm；General container steel order width differs 10mm with high-intensity band steel order width；
2) first smelt a stove general container steel, the content of its mn is controlled by the higher limit 0.58% setting, and carries out outside stove
Refine；Start to be smelted by high-intensity band steel composition from the 2nd stove, and carry out external refining；
3) it is casting continuously to form base: general container steel leaves and pours thickness of strand is 70mm, and the general container steel poured into a mould is from second piece
Strand starts to the strand of follow-up casting, all using wick-containing pressure reduction slab thickness to 55mm；
When high-intensity band steel molten steel and general container molten steel mix and pour, continuous casting production tonnage is controlled according to 25 tons；
Begin with high-strength steel mould flux in mixed pouring；When controlling mixed pouring, main frame pulling rate is in 3.8m/min；
When mixed pour end after, casting machine casting speed control is in 4.1m/min；
4) strand is heated and high pressure descaling after rolled: general container steel thickness is gradually transitions from 3.0mm open rolling
It may be assumed that 3.0mm thickness rolls 2 pieces, 2.0mm thickness rolls 2 pieces to 1.6mm, and 1.6mm thickness rolls 4 pieces；
The thickness of high-intensity band steel is gradually transitions 1.2mm it may be assumed that 1.4mm thickness rolls 1 piece from 1.4 mm, and 1.3mm thickness rolls
1 piece, subsequently all roll the high-intensity band steel of 1.2mm thickness；
Regard as mixing with first 2 pieces of high-intensity band steel for last 1 piece of general container steel and pour base, and as waste disposal；
5) batched after section cooling, stand-by after cooling.
After testing, the mechanical property of the 1.2mm thick and high-strength degree strip steel being rolled is: yield strength is 725 mpa,
Tensile strength is 807 mpa, and elongation percentage is 14%, fully meets order user requirement.
Embodiment 3
A kind of employing csp technique productions thickness is the method for the high-strength hot-rolled strip steel of 1.2mm, its step:
1) applicable elements: general container steel order thickness requirement in 1.6 ~ 3.0mm, high-intensity band steel order thickness requirement is
1.2mm；General container steel order width differs 8mm with high-intensity band steel order width；
2) first smelt a stove general container steel, the content of its mn is controlled by the higher limit 0.58% setting, and carries out outside stove
Refine；Start to be smelted by high-intensity band steel composition from the 2nd stove, and carry out external refining；
3) it is casting continuously to form base: general container steel leaves and pours thickness of strand is 70mm, and the general container steel poured into a mould is from second piece
Strand starts to the strand of follow-up casting, all using wick-containing pressure reduction slab thickness to 55mm；
When high-intensity band steel molten steel and general container molten steel mix and pour, continuous casting production tonnage is controlled according to 25 tons；
Begin with high-strength steel mould flux in mixed pouring；When controlling mixed pouring, main frame pulling rate is in 3.7m/min；
When mixed pour end after, casting machine casting speed control is in 4.0m/min；
4) strand is heated and high pressure descaling after rolled: general container steel thickness is gradually transitions from 3.0mm open rolling
It may be assumed that 3.0mm thickness rolls 2 pieces, 2.0mm thickness rolls 2 pieces to 1.6mm, and 1.6mm thickness rolls 4 pieces；
The thickness of high-intensity band steel is gradually transitions 1.2mm it may be assumed that 1.4mm thickness rolls 1 piece from 1.4 mm, and 1.3mm thickness rolls
1 piece, subsequently all roll the high-intensity band steel of 1.2mm thickness；
Regard as mixing with first 2 pieces of high-intensity band steel for last 1 piece of general container steel and pour base, and as waste disposal；
5) batched after section cooling, stand-by after cooling.
After testing, the mechanical property of the 1.2mm thick and high-strength degree strip steel being rolled is: yield strength is 749 mpa,
Tensile strength is 805 mpa, and elongation percentage is 13%, fully meets order user requirement.
Embodiment 4
A kind of employing csp technique productions thickness is the method for the high-strength hot-rolled strip steel of 1.2mm, its step:
1) applicable elements: general container steel order thickness requirement in 1.6 ~ 3.0mm, high-intensity band steel order thickness requirement is
1.2mm；General container steel order width differs 10mm with high-intensity band steel order width；
2) first smelt a stove general container steel, the content of its mn is controlled by the higher limit 0.58% setting, and carries out outside stove
Refine；Start to be smelted by high-intensity band steel composition from the 2nd stove, and carry out external refining；
3) it is casting continuously to form base: general container steel leaves and pours thickness of strand is 70mm, and the general container steel poured into a mould is from second piece
Strand starts to the strand of follow-up casting, all using wick-containing pressure reduction slab thickness to 55mm；
When high-intensity band steel molten steel and general container molten steel mix and pour, continuous casting production tonnage is controlled according to 25 tons；
Begin with high-strength steel mould flux in mixed pouring；When controlling mixed pouring, main frame pulling rate is in 3.75m/min；
When mixed pour end after, casting machine casting speed control is in 4.3m/min；
4) strand is heated and high pressure descaling after rolled: general container steel thickness is gradually transitions from 3.0mm open rolling
It may be assumed that 3.0mm thickness rolls 2 pieces, 2.0mm thickness rolls 2 pieces to 1.6mm, and 1.6mm thickness rolls 4 pieces；
The thickness of high-intensity band steel is gradually transitions 1.2mm it may be assumed that 1.4mm thickness rolls 1 piece from 1.4 mm, and 1.3mm thickness rolls
1 piece, subsequently all roll the high-intensity band steel of 1.2mm thickness；
Regard as mixing with first 2 pieces of high-intensity band steel for last 1 piece of general container steel and pour base, and as waste disposal；
5) batched after section cooling, stand-by after cooling.
After testing, the mechanical property of the high-intensity band steel of 1.2mm thickness being rolled is: yield strength is 728 mpa,
Tensile strength is 807mpa, and elongation percentage is 13.9%, fully meets order user requirement.
This specific embodiment only most preferably enumerates, not the restricted enforcement to technical solution of the present invention.
Claims (2)
1. a kind of employing csp technique productions thickness be the high-strength hot-rolled strip steel of 1.2mm method it is characterised in that: its step:
1) applicable elements: general container steel order thickness requirement in 1.6 ~ 3.0mm, high intensity order thickness requirement is
1.2mm；General container steel order width is differed with high strength steel order width and is less than 10mm；
2) first smelt a stove general container steel, the content of its mn is controlled by the higher limit setting, and carries out external refining；
Start to be smelted by high strength steel composition from the 2nd stove, and carry out external refining；
3) it is casting continuously to form base: general container steel leaves and pours thickness of strand is 70mm, and the general container steel poured into a mould is from second piece
Strand starts to the strand of follow-up casting, all using wick-containing pressure reduction slab thickness to 55mm；
When high strength steel molten steel and general container molten steel mix and pour, continuous casting production tonnage is controlled according to 25 tons；
Begin with high strength steel mould flux in mixed pouring；When controlling mixed pouring, casting machine pulling rate is in 3.6-3.8m/min；
When mixed pour end after, casting machine casting speed control is in 4.0-4.3m/min；
4) strand is heated and high pressure descaling after rolled: general container steel thickness is gradually transitions from 3.0mm open rolling
It may be assumed that 3.0mm thickness rolls 2 pieces, 2.0mm thickness rolls 2 pieces to 1.6mm, and 1.6mm thickness rolls 4 pieces；
The thickness of high strength steel is gradually transitions 1.2mm it may be assumed that 1.4mm thickness rolls 1 piece from 1.4 mm, 1.3mm thickness rolling 1
Block, subsequently all rolls the high strength steel of 1.2mm thickness；
Regard as mixing with first 2 pieces of high strength steel for last 1 piece of general container steel and pour base, and as waste disposal；
5) batched after section cooling, stand-by after cooling.
2. a kind of employing csp line produces the method that thickness is the high-strength hot-rolled strip steel of 1.2mm as claimed in claim 1, and it is special
Levy and be: described high strength steel means high-strength hot-rolled strip steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610750985.9A CN106363020B (en) | 2016-08-30 | 2016-08-30 | A method of it is produced using CSP technique with a thickness of the high-strength hot-rolled strip of 1.2mm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610750985.9A CN106363020B (en) | 2016-08-30 | 2016-08-30 | A method of it is produced using CSP technique with a thickness of the high-strength hot-rolled strip of 1.2mm |
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| CN106363020A true CN106363020A (en) | 2017-02-01 |
| CN106363020B CN106363020B (en) | 2018-11-23 |
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| CN106363020B (en) | 2018-11-23 |
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