CN103602896B - A kind of production method of boracic tubulation steel band - Google Patents
A kind of production method of boracic tubulation steel band Download PDFInfo
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- CN103602896B CN103602896B CN201310654992.5A CN201310654992A CN103602896B CN 103602896 B CN103602896 B CN 103602896B CN 201310654992 A CN201310654992 A CN 201310654992A CN 103602896 B CN103602896 B CN 103602896B
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Abstract
The invention discloses a kind of production method of boracic tubulation steel band, boracic tubulation steel band composition proportion, is: B:0.0008 ~ 0.0028 by weight percentage; C≤0.19%; Si:0.15 ~ 0.35; Mn≤1.53; P≤0.015; S≤0.010; N≤0.0045; Als:0.023 ~ 0.032; Ti:0.015 ~ 0.020; All the other are iron and inevitable impurity; The production method of this boracic tubulation steel band, comprises following technique: smelting → LF refining → CSP CSP → cool → batch; The production method of this boracic tubulation steel band, adopts specific steel grade Composition Design, and coordinate CSP casting and rolling process, the boracic tubulation steel band of production, have Technological adaptability good, energy consumption is low, and production efficiency is high; Product plate shape is good, and lumber recovery is high, and dimensional precision is high, steady performance.
Description
Technical field
The present invention relates to field of steel production, be specifically related to a kind of production method of boracic tubulation steel band.
Background technology
Boron, in the effect improving hardening capacity, has many features being different from other alloying element, mainly contains:
(1) the very competent of hardening capacity is improved.The effect of 0.0010% ~ 0.0030% boron can be equivalent to the effect of 0.60% manganese, 0.7% chromium, 0.5% molybdenum and 1.5% nickel respectively, therefore it improves the hundred times and even thousands of times that ability of hardening capacity is above-mentioned alloying element, therefore only needs minute quantity boron can save a large amount of expensive alloying elements.
(2) there is optimum content and this content is minimum.The effect that general alloying element improves hardening capacity increases with its content in steel and increases, but boron has an optimum content scope, too much or very few all unfavorable to raising hardening capacity, and this amount is very little, be about 0.0010%, general control is advisable 0.0005% ~ 0.0030%.
(3) the hardening capacity effect of boron is relevant with the composition of steel.Generally believe the carbon in steel and alloying element content raising, the effect that boron improves hardening capacity then declines.So the hardening capacity most pronounced effects of boron in low-carbon (LC), low alloy steel.
(4) the hardening capacity effect of boron is relevant with austenitizing condition.Early stage research shows to there is special relationship between the two, i.e. the hardening capacity best results of boron under a certain specific austenitizing temperature; Temperature raises again, although Austenite Grain Growth, the hardening capacity effect of boron declines on the contrary.
Thus, add the selection of boron steel heating process and control very important, being out of shape at a lower temperature, obtain better compared with high-hardenability and less grain fineness number to boron-containing steel, Heating temperature is unsuitable too high.
At present, the production of boracic tubulation steel band, usually uses common rolling technology, considers the singularity of boron, and common rolling technology is produced, not only bad adaptability, and the production cycle is long, and cost is high; And the constant product quality of the boracic tubulation steel band produced is not high, lumber recovery is low.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of adaptability good, with short production cycle, cost is low; Constant product quality is good, the production method of the boracic tubulation steel band that lumber recovery is high.
To achieve these goals, the technical solution used in the present invention is:
The present invention adjusts steel grades, coordinates CSP sheet continuous casting and rolling technique, produces boracic tubulation steel band, adopt CSP sheet bar process production boracic tubulation steel band to have Technological adaptability good, energy consumption is low, and production efficiency is high, product plate shape is good, the features such as dimensional precision is high, Functionality, quality and appealing design, stable performance.
The present invention manufactures boracic tubulation steel band by the method for " top and bottom complex blowing oxygen coverter smelting → LF refining → CSP sheet blank continuous casting/hot rolling → batch ", and the first two procedure is mainly used for producing qualified molten steel; The Composition Design of molten steel of the present invention must meet the requirement of product demand and CSP technique, namely should have good castability and higher purity.Therefore, the Composition Design thinking of product of the present invention is: carry out B alloying after low C, Al deoxidation, its C%≤0.19%, and Als is 0.023 ~ 0.032%, B is 0.0008% ~ 0.0028%.
The production method of this boracic tubulation steel band, boracic tubulation steel band composition proportion, is: B:0.0008 ~ 0.0028 by weight percentage; C≤0.19%; Si:0.15 ~ 0.35; Mn≤1.53; P≤0.015; S≤0.010; N≤0.0045; Als:0.023 ~ 0.032; Ti:0.015 ~ 0.020; All the other are iron and inevitable impurity;
The production method of this boracic tubulation steel band, comprises following technique: smelting → LF refining → CSP CSP → cool → batch;
Smelt and smelted by top and bottom complex blowing oxygen coverter; Top and bottom complex blowing oxygen coverter is smelted and LF refining, produces qualified molten steel, and the design of boracic tubulation steel band molten steel component must meet the requirement of product demand and CSP technique;
CSP casts: casting molten steel overheat (molten steel exceedes self melting temperature) controls at 10 ~ 25 DEG C, casting speed controls at 3.5 ~ 4.5m/min, use the pressure of liquid core to make rolling slab thickness be less than 70mm, the soaking temperature of holding furnace is set as 1100 ~ 1210 DEG C; Holding furnace adopts continuous tunnel furnace;
CSP hot rolling: hot rolling total reduction >=70%, entry temperature at finishing is set as 930 ~ 1000 DEG C, and finishing temperature is set as 850 ~ 900 DEG C; The front high-pressure water descaling of strand open rolling, high-pressure water outlet pressure setting is 200 ~ 360bar;
Cooling: roll rear employing section cooling mode and cool, speed of cooling is set as 35 ~ 45 DEG C;
Batch: coiling temperature is set as 580 ~ 620 DEG C.
The present invention only can need realize according to mentioned component design and processes mode; On general strip hot tandem, the cooperation of above special temperature schedule, reduction system and cooling system can be adopted, the boracic tubulation steel band that thickness specification is 2.5 ~ 12.7mm can be produced simultaneously.
Following requirement is reached according to the boracic tubulation steel band performance that the production method of this boracic tubulation steel band is produced:
(1) tensile property: Rt0.5(Rp0.2) >=235MPa; Rm=360 ~ 650MPa;
(2) unit elongation: A50 >=22%;
(3) hardness: HRC≤22;
(4)-20 DEG C of full-scale v-notch Charpy impact work value: >=27J; Shear area >=90%;
(5) clod wash: d=2a, 180 °, qualified.
The invention has the advantages that: the production method of this boracic tubulation steel band, adopt specific steel grade Composition Design, coordinate CSP casting and rolling process, compared with prior art, the boracic tubulation steel band of production, have Technological adaptability good, energy consumption is low, and production efficiency is high; Product plate shape is good, the features such as dimensional precision is high, Functionality, quality and appealing design, stable performance; The processing lumber recovery of tube mill can be improved, and improve product work-ing life; Ton material cost can reduce more than 400 yuan.
Embodiment
Below by the description to optimum embodiment, the specific embodiment of the present invention is described in further detail.
The production method of this boracic tubulation steel band, boracic tubulation steel band composition proportion, is designed to: B:0.0008 ~ 0.0028 by weight percentage; C≤0.19%; Si:0.15 ~ 0.35; Mn≤1.53; P≤0.015; S≤0.010; N≤0.0045; Als:0.023 ~ 0.032; Ti:0.015 ~ 0.020; All the other are iron and inevitable impurity;
The production method of this boracic tubulation steel band, comprises following technique: top and bottom complex blowing oxygen coverter smelting → LF refining → CSP CSP → cool → batch;
CSP casts: molten steel overheat controls at 10 ~ 25 DEG C, and casting speed controls at 3.5 ~ 4.5m/min, and use the pressure of liquid core to make rolling slab thickness be less than 70mm, the soaking temperature of continuous tunnel furnace is set as 1100 ~ 1210 DEG C;
CSP hot rolling: hot rolling total reduction >=70%, entry temperature at finishing is set as 930 ~ 1000 DEG C, and finishing temperature is set as 850 ~ 900 DEG C; Through high-pressure water descaling before strand open rolling, high-pressure water outlet pressure setting is 200 ~ 360bar;
Cooling: roll rear employing section cooling mode and cool, speed of cooling is set as 35 ~ 45 DEG C;
Batch: coiling temperature is set as 580 ~ 620 DEG C.
Embodiment 1
(1) technical process: top and bottom complex blowing oxygen coverter smelting → LF refining → CSP CSP → cool → batch;
(2) chemical composition: chemical composition proportioning is in table 1;
(3) CSP casting and rolling process parameter is in table 2.
The mechanical property of the boracic tubulation steel band that embodiment 1 is produced is in table 3.
Embodiment 2
(1) technical process: top and bottom complex blowing oxygen coverter smelting → LF refining → CSP CSP → cool → batch;
(2) chemical composition: chemical composition proportioning is in table 1;
(3) CSP casting and rolling process parameter is in table 2.
The mechanical property of the boracic tubulation steel band that embodiment 2 is produced is in table 3.
Embodiment 3
(1) technical process: top and bottom complex blowing oxygen coverter smelting → LF refining → CSP CSP → cool → batch;
(2) chemical composition: chemical composition proportioning is in table 1;
(3) CSP casting and rolling process parameter is in table 2.
The mechanical property of the boracic tubulation steel band that embodiment 3 is produced is in table 3.
The chemical composition of the boracic tubulation steel band of embodiment of the present invention 1-3 is as table 1, and the processing parameter of embodiment 1-3 is in table 2, and the mechanical property of embodiment 1-3 is in table 3, and product thickness specification is respectively 5.0,7.9 and 12.5mm.
Table 1 embodiment 1-3 boracic tubulation steel band chemical composition (wt%)
| Sequence number | B | C | Si | Mn | P | S | N | Ti | Als |
| 1 | 0.0008 | 0.19 | 0.35 | 1.53 | 0.015 | 0.010 | 0.0045 | 0.015 | 0.032 |
| 2 | 0.0015 | 0.15 | 0.25 | 1.35 | 0.014 | 0.010 | 0.0035 | 0.015 | 0.023 |
| 3 | 0.0028 | 0.10 | 0.15 | 1.05 | 0.015 | 0.010 | 0.0030 | 0.015 | 0.025 |
Table 2 embodiment 1-3 processing parameter
Table 3 embodiment 1-3 over-all properties
Known by above embodiment, the performance of the boracic tubulation steel produced according to the production method of this boracic tubulation steel band can reach: yield strength >=235MPa; Tensile strength: 360 ~ 650MPa; Elongation >=22%; Hardness HRC≤22;-20 DEG C of full-scale v-notch Charpy-V impact power >=27J, the index request of shear area >=90%.In addition, the composition of steel grade of the present invention is simple, hardening capacity strong, is conducive to tube mill's thermal treatment, and the steel strength after thermal treatment and toughness can further improve.
Principle of the present invention is: the production method of this boracic tubulation steel band, for the feature of boron micro-alloyed steel, adopts specific steel grade composition proportion to design, and coordinates CSP casting and rolling process, produces and meet production requirement, superior in quality boracic tubulation steel band.
CSP thin slab technology is the organic assembling of various equipment and utilisation technology, and it for building platform, has creatively succeeded in developing a kind of production technique of ferrous materials with efficient smelting technology, rolling technique, automatic control technology.Because sheet bar process and traditional production technique also exist significant difference in molten steel preparation, blank casting, rolling technology and control etc., so, thin slab production technology has its technique unique distinction, is not supplementing or simply transforming of traditional hot rolling production technology.It relate to many be different from traditional technology technical parameter, chemical composition, smelting and rolling procedure etc., the relation of this complexity embodies its technical superiority and development potentiality, for Study and Development new variety provide condition.
Compared with traditional Hot Rolling Plate Production technique, CSP sheet bar process of the present invention produces boracic tubulation steel band, in technology and economic dispatch, have obvious advantage:
(1) work simplification, equipment reduce, production line is short, thus considerably reduce capital construction investment, make a ton steel investment decline 19% ~ 34%.
(2) with short production cycle.Deliver to conveyer chain from smelting molten steel to coil of strip, only need about 2 hours, thus decrease lot of fund.
(3) lumber recovery improves about 2% ~ 3%, and energy consumption reduces about 20%, thus reduces production cost, and ton material cost is reduced.
(4) due to the processing condition of compact, namely thin slab directly enters soaking pit and Direct Rolling (not needing again long-time heating and cogging) in as cast condition, strand inside and outside temperature difference is less, thin slab is made to be better than along the temperature distribution of length and width section more even (± 10, DEG C) thickness of slab precision, convexity and planeness etc. that therefore thin slab obtains the band steel that traditional rolling technology produces.
(5) hot-rolled sheet coil producing Thin Specs (thickness of slab≤12.7mm), width is less than 1600mm is suitable for, better economy.
Boron replaces other alloying elements a large amount of with trace B in steel, therefore compared with other steel alloys identical with hardening capacity, alloy content reduces greatly, and the resistance to deformation when high temperature reduces, easy viscous deformation, and its oxide skin also loosely, easily comes off; So boron-containing steel is relatively soft when hot rolling, effects on surface de-scaling procedure calls is not high, and this is for continuous casting and rolling technique of sheet bar, more fast can produce the better product of surface quality.
In the production method of this boracic tubulation steel band, add the selection of boron steel heating process and control very important.Heating temperature is unsuitable too high, and heat-up time should shorten as far as possible; And due to CSP technique continuous seepage, be suitable for heat-up time, de-boron can be reduced as far as possible.Separately be out of shape at a lower temperature, to boron-containing steel obtain compared with high-hardenability and less grain fineness number better.
The present invention produces boracic tubulation steel by advanced CSP continuous casting and rolling technique of sheet bar, has that energy consumption is low, process cost is low, the adaptation of product is good, the excellent feature of quality, has filled up the production blank that CSP produces boracic tube steel.
Above to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (2)
1. a production method for boracic tubulation steel band, is characterized in that: the composition proportion of boracic tubulation steel band, is: B:0.0008 ~ 0.0028 by weight percentage; C≤0.19%; Si:0.15 ~ 0.35; Mn≤1.53; P≤0.015; S≤0.010; N≤0.0045; Als:0.023 ~ 0.032; Ti:0.015 ~ 0.020; All the other are iron and inevitable impurity;
The production method of this boracic tubulation steel band, comprises following technique: smelting → LF refining → CSP CSP → cool → batch;
Smelt and smelted by top and bottom complex blowing oxygen coverter;
In CSP continuous casting and rolling technique of sheet bar:
CSP sheet blank continuous casting: casting molten steel overheat controls at 10 ~ 25 DEG C, and casting speed controls at 3.5 ~ 4.5m/min, the pressure of liquid core makes rolling slab thickness be less than 70mm, and the soaking temperature of holding furnace is set as 1100 ~ 1210 DEG C;
CSP thin slab continuous rolling: hot rolling total reduction >=70%, entry temperature at finishing is set as 930 ~ 1000 DEG C, and finishing temperature is set as 850 ~ 900 DEG C;
Before CSP thin slab continuous rolling, strand is through high-pressure water descaling, and high-pressure water outlet pressure is 200 ~ 360bar;
Roll rear employing section cooling mode to cool, speed of cooling is set as 35 ~ 45 DEG C;
Coiling temperature is set as 580 ~ 620 DEG C.
2. the production method of boracic tubulation steel band as claimed in claim 1, it is characterized in that: this boracic tubulation steel band, yield strength >=235MPa, tensile strength is 360 ~ 650MPa; Elongation >=22%; Hardness≤22.
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