CN109055650A - A method of 700MPa grades of carriage body steel of hot rolling thin gauge are produced completely without head bar strip continuous casting and rolling flow path based on ESP - Google Patents

A method of 700MPa grades of carriage body steel of hot rolling thin gauge are produced completely without head bar strip continuous casting and rolling flow path based on ESP Download PDF

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Publication number
CN109055650A
CN109055650A CN201810934100.XA CN201810934100A CN109055650A CN 109055650 A CN109055650 A CN 109055650A CN 201810934100 A CN201810934100 A CN 201810934100A CN 109055650 A CN109055650 A CN 109055650A
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China
Prior art keywords
carriage body
steel
continuous casting
esp
rolling
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Withdrawn
Application number
CN201810934100.XA
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Chinese (zh)
Inventor
秦哲
赵文
梁宗仁
朱经涛
喻尧
谢基表
季伟斌
郑旭涛
徐正彪
陈金伟
马锦峰
杜建全
梁其凯
安守勇
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Rizhao Steel Holding Group Co Ltd
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Rizhao Steel Holding Group Co Ltd
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Priority to CN201810934100.XA priority Critical patent/CN109055650A/en
Publication of CN109055650A publication Critical patent/CN109055650A/en
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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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

The invention belongs to iron and steel technical fields, specially a kind of method that hot rolling thin gauge RE700XT carriage body steel is produced completely without head bar strip continuous casting and rolling flow path based on ESP, slab is directly rolled without soaking stove heating under the high pulling rate of this process flow, the technological process of production is short, it is energy saving, reduce cost, belong to low energy consumption green manufacturing process regime, can stable rolling produce 1.2mm~3.5mm thin gauge hot-rolling high-strength steel, the elongated thickness of hot rolled coil is uniform, performance is stablized, properties of product meet yield strength Rp0.2: >=700MPa, tensile strength Rm:750-850MPa, A >=12%, metallographic structure is ferrite and a small amount of granular bainite.

Description

One kind producing hot rolling thin gauge completely without head bar strip continuous casting and rolling flow path based on ESP The method of 700MPa grades of carriage body steel
Technical field
The invention belongs to iron and steel technical fields, specially a kind of to be produced based on ESP completely without head bar strip continuous casting and rolling flow path The method of hot rolling thin gauge RE700XT carriage body steel.
Background technique
With the development of the automobile industry, it is the bearing capacity for improving automobile, meets energy conservation, section material and safety traffic, light The demand of quantization uses thin format hot rolled steel plate that cold-rolled steel sheet is replaced to realize and has become development trend with hot Dai Leng, energy-saving and emission-reduction. Vehicle structure not only wants intensity, plasticity, toughness, good fatigue properties and processability with higher with high-strength steel, simultaneously Also require higher steel degree of purity, inclusion balling degree height, microscopic structure excellent.
In the prior art, yield strength 700MPa grades, Ultra-thin (h < 2.0mm, width 1500mm) high-strength steel are produced, The main production technology using slab heating → roughing → finish rolling → smooth, the technological process of production is complicated, and energy-output ratio is big, raw The steel plate of production cannot be guaranteed that thickness and precision and carriage body are required with steel plate type, and the stability of steel plate is poor.
Technical solution
To solve above-mentioned problems of the prior art, the present invention provides a kind of low cost production high strength steel The method for manufacturing of RE700XT carriage body steel inexpensive can produce RE700XT carriage body steel using this method, produce RE700XT carriage body steel, intensity, plasticity, toughness, good fatigue properties and processability with higher.
The specific technical solution of the present invention is as follows:
A kind of side producing 700MPa grades of carriage body steel of hot rolling thin gauge completely without head bar strip continuous casting and rolling flow path based on ESP Method comprises the following steps that:
(1) raw material is smelted through converter, LF, RH furnace；
(2) continuous casting；
(3) slab directly carries out hot rolling without soaking stove heating；
Hot rolled coil product thickness is 1.2mm~3.5mm；
The carriage body comprises the following components in parts by weight component with steel: C:0.04%~0.06%, Si:0.15%~ 0.50%, Mn:1.4%~1.9%, Als:0.02%~0.04%, Nb:0.015%~0.06%, Ti:0.04%~ 0.13%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, surplus Fe.
Preferably, in the continuous casting process, thickness of strand 90mm-110mm.
Preferably, pulling rate is 4.5m/min~6.0m/min in the continuous casting process.
Preferably, the process conditions that the converter, LF, RH furnace are smelted are as follows: converter (300t, combined blown converter, equipped under Slag detection, slide plate skimming device of tapping) top and bottom combined blown converter smelting, the control of terminal C content is in 0.03-0.05%, tapping temperature 1630-1660 DEG C, the control of steel slag thickness is in 60mm or less out；In 40-60min, refining terminates to carry out feeding calcium the control of LF refining time Line is handled, soft blow >=10min after Calcium treatment.RH carries out trimming and inclusion removal.
Preferably, in the step 3, hot rolling roughing inlet temperature >=950 DEG C, induction heating heater outlet temperature 1050~ 1180 DEG C, 810 DEG C~870 DEG C of exit temperature at finishing, 580 DEG C~660 DEG C of coiling temperature.
Preferably, the carriage body comprises the following components in parts by weight component with steel: C:0.04%~0.06%, Si:0.2%~ 0.40%, Mn:1.5%~1.8%, Als:0.025%~0.03%, Nb:0.03%~0.05%, Ti:0.06%~ 0.10%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, surplus Fe.
Preferably, the carriage body comprises the following components in parts by weight component with steel: C:0.05%, Si:0.30%, Mn: 1.6%, Als:0.03%, Nb:0.04%, Ti:0.08%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, it is remaining Amount is Fe.
To make the yield strength of steel plate reach 700MPa grades, while meeting the matched well of toughness, weldability and formability It is required that ingredient is designed using low-carbon high-manganese, and micro alloying element Nb, Ti are added in steel.If carbon content is excessively high in steel, to the greatest extent Pipe can greatly improve the intensity of steel, but the plasticity decline of steel, seriously affect the cold formability energy and weldability of steel, will cause back Bouncing the problems such as big is that following process causes difficulty.
Mn content also has an impact to the obdurability of steel, if content is relatively low, it cannot be guaranteed that low-carbon ingredient design when steel it is strong Degree, if too high levels, influences the cold stamping and welding performance of steel plate, while rolling load being caused to increase.
In addition, the control of P, S are also particularly significant, due to being designed using the ingredient of high Mn, then S easily forms MnS folder in steel Sundries and segregation, P easily form serious segregated zone, can greatly improve the rank of banded structure, and the sulfide along rolling direction presss from both sides It is miscellaneous to cause the anisotropy of steel plate to increase with segregation, therefore should as far as possible control P, S content in steel in lower range.
Nb, Ti micro alloying element are added in steel, the recrystallization temperature of steel can be improved, RE700XT carriage body steel is made to exist The deformed austenite tissue for obtaining storage large deformation energy while rolling is completed under higher temperature, and then obtains tiny phase transformation group It knits.And using Nb, Ti carbonitride particle precipitation, may also function as precipitation strength effect, finally make steel plate refined crystalline strengthening, Under the comprehensive function of phase transformation strengthening and precipitation strength, excellent properties are obtained.
Beneficial effect
(1) present invention is used using ESP completely without head bar strip continuous casting and rolling flow path production hot rolling thin gauge RE700XT carriage body Steel, can stable rolling produce 1.2mm~3.5mm thin gauge hot-rolling high-strength steel, the elongated thickness of hot rolled coil is uniform, performance stablize, produce Moral character is able to satisfy yield strength Rp0.2: >=730MPa, tensile strength Rm:760-850MPa, A80 (elongation percentage) >=14%, metallographic Tissue is ferrite.The hot-rolled product performance produced is stable, dimensional tolerance is small, and hot-rolled state can reach≤2mm thin gauge Band.The RE700XT carriage body steel of production can meet manufacture motor vehicle body steel demand.Strip is able to produce using this technique Material can reach the purpose energy-saving " with hot Dai Leng " " with Bao Daihou ", have very high economic results in society.
(2) ESP produces RE700XT carriage body steel completely without head casting and rolling process, and ESP is completely without head casting and rolling process, steel Water degree of purity is high, and Composition Control is stablized, and casting blank solidification speed is fast, as-cast structure is more uniform, Segregation of Chemical Composition is small, slab without Soaking stove heating realizes direct casting, and slab is low in operation of rolling temperature, and rolling time is short, and reduction in pass is big, facilitate into Step refining crystal grain.ESP thickness of strand 90mm-110mm, hot rolling product thickness 1.2mm-3.5mm, ESP connect completely without head continuous casting Roll process does not need threading, and the elongated thickness of hot rolled coil is uniform, and dimensional accuracy is high, and plate shape is good, and performance is stablized.
(3) slab is directly rolled without soaking stove heating under the high pulling rate of this process flow, and the technological process of production is short, section The about energy reduces cost, belongs to low energy consumption green manufacturing process regime.The hot-rolled product performance produced is stable, plate shape is good Well, dimensional tolerance is small, and hot-rolled state can reach≤2mm thin gauge band, reach energy-saving " with hot Dai Leng " " with Bao Daihou " Purpose.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of 1 gained carriage body steel of embodiment.
Specific embodiment
Embodiment 1
A kind of side producing 700MPa grades of carriage body steel of hot rolling thin gauge completely without head bar strip continuous casting and rolling flow path based on ESP Method comprises the following steps that:
(1) raw material is smelted through converter, LF, RH furnace furnace；
(2) continuous casting: pulling rate degree is 6.0m/min, thickness of strand 90mm.
(3) slab directly carries out hot rolling without soaking stove heating；Hot rolling roughing inlet temperature >=950 DEG C, induction heater 1050 DEG C of outlet temperature, 810 DEG C of exit temperature at finishing, 650 DEG C of coiling temperature.
The carriage body comprises the following components in parts by weight component with steel: C:0.05%, Si:0.30%, Mn:1.6%, Als: 0.03%, Nb:0.04%, Ti:0.08%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, surplus Fe.
Gained hot rolled coil product thickness is 1.2mm, and gained hot rolled coil properties of product meet yield strength Rp0.2: >= 730MPa, tensile strength Rm:760MPa, A80 >=14%, metallographic structure are ferrite.
Embodiment 2
A kind of side producing 700MPa grades of carriage body steel of hot rolling thin gauge completely without head bar strip continuous casting and rolling flow path based on ESP Method comprises the following steps that:
(1) raw material is smelted through converter, LF, RH furnace furnace；
(2) continuous casting: pulling rate degree is 5.0m/min, thickness of strand 110mm.
(3) slab directly carries out hot rolling without soaking stove heating；Hot rolling roughing inlet temperature >=950 DEG C, induction heater 1180 DEG C of outlet temperature, 870 DEG C of exit temperature at finishing, 630 DEG C of coiling temperature.
The carriage body comprises the following components in parts by weight component with steel: C:0.04%, Si:0.2%, Mn:1.5%, Als: 0.025%, Nb:0.03%, Ti:0.06%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, surplus Fe.
Gained hot rolled coil product thickness is 3.5mm, and gained hot rolled coil product yield strength Rp0.2: >=730MPa, tension are strong Rm:850MPa is spent, A80 >=14%, metallographic structure is ferrite.
Embodiment 3
A kind of side producing 700MPa grades of carriage body steel of hot rolling thin gauge completely without head bar strip continuous casting and rolling flow path based on ESP Method comprises the following steps that:
(1) raw material is smelted through converter, LF, RH furnace；
(2) continuous casting: pulling rate degree is 5.5m/min, slab thickness 100mm.
(3) slab directly carries out hot rolling without soaking stove heating；Hot rolling roughing inlet temperature >=950 DEG C, induction heater 1100 DEG C of outlet temperature, 850 DEG C of exit temperature at finishing, 600 DEG C of coiling temperature.
The carriage body comprises the following components in parts by weight component with steel: C:0.06%, Si:0.40%, Mn:1.8%, Als: 0.03%, Nb:0.05%, Ti:0.10%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, surplus Fe.
Gained hot rolled coil product thickness is 2mm, gained hot rolled coil product yield strength Rp0.2: >=730MPa, tensile strength Rm:800MPa, A80 (elongation percentage) >=14%, metallographic structure are ferrite.

Claims (7)

1. a kind of side for producing 700MPa grades of carriage body steel of hot rolling thin gauge completely without head bar strip continuous casting and rolling flow path based on ESP Method, which is characterized in that comprise the following steps that:
(1) raw material is smelted through converter, LF, RH furnace；
(2) continuous casting；
(3) slab directly carries out hot rolling without soaking stove heating；
Hot rolled coil product thickness is 1.2mm~3.5mm；
The carriage body comprises the following components in parts by weight component with steel: C:0.04%~0.06%；Si:0.15%~0.50%；Mn: 1.2%~1.9%；Als:0.02%~0.04%；Nb:0.015%~0.06%；Ti:0.04%~0.13%；S :≤ 0.0010%；P :≤0.015%；N :≤0.005%, surplus Fe；
The carriage body steel product performance meets yield strength Rp0.2: >=700MPa, tensile strength Rm:750-850MPa, A80 >=12%.
2. according to claim 1 produce hot rolling thin gauge 700MPa completely without head bar strip continuous casting and rolling flow path based on ESP The method of grade carriage body steel, which is characterized in that the process conditions that the converter, LF, RH furnace are smelted are as follows: converter top and bottom combined blown converter It smelts, the control of terminal C content is in 0.03-0.05%, and 1630-1660 DEG C of tapping temperature, the control of steel slag thickness is in 60mm or less out；LF In 40-60min, refining terminates feed calcium line processing, soft blow >=10min after Calcium treatment for refining time control.
3. according to claim 1 produce hot rolling thin gauge 700MPa completely without head bar strip continuous casting and rolling flow path based on ESP The method of grade carriage body steel, which is characterized in that in the continuous casting process, thickness of strand 90mm-110mm.
4. according to claim 1 produce hot rolling thin gauge 700MPa completely without head bar strip continuous casting and rolling flow path based on ESP The method of grade carriage body steel, which is characterized in that in the continuous casting process, pulling rate is 4.5m/min~6.0m/min.
5. according to claim 1 produce hot rolling thin gauge 700MPa completely without head bar strip continuous casting and rolling flow path based on ESP The method of grade carriage body steel, which is characterized in that in the step 3, hot rolling roughing inlet temperature >=950 DEG C, induction heater goes out 1050~1180 DEG C of temperature, 810 DEG C~870 DEG C of exit temperature at finishing, 580 DEG C~660 DEG C of coiling temperature of mouth.
6. according to claim 1 produce hot rolling thin gauge 700MPa completely without head bar strip continuous casting and rolling flow path based on ESP The method of grade carriage body steel, which is characterized in that the carriage body comprises the following components in parts by weight component with steel: C:0.04%~ 0.06%, Si:0.2%~0.40%, Mn:1.5%~1.8%, Als:0.025%~0.03%, Nb:0.03%~ 0.05%, Ti:0.06%~0.10%, S :≤0.0010%, P :≤0.015%, N :≤0.005%, surplus Fe.
7. according to claim 1 produce hot rolling thin gauge 700MPa completely without head bar strip continuous casting and rolling flow path based on ESP The method of grade carriage body steel, which is characterized in that the carriage body comprises the following components in parts by weight component with steel: C:0.05%, Si: 0.30%, Mn:1.6%, Als:0.03%, Nb:0.04%, Ti:0.08%, S :≤0.0010%, P :≤0.015%, N :≤ 0.005%, surplus Fe.
CN201810934100.XA 2018-08-16 2018-08-16 A method of 700MPa grades of carriage body steel of hot rolling thin gauge are produced completely without head bar strip continuous casting and rolling flow path based on ESP Withdrawn CN109055650A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112958623A (en) * 2021-02-26 2021-06-15 日照钢铁控股集团有限公司 Steel for thin-specification elevator and ferrite zone rolling process and application thereof
CN113600617A (en) * 2021-07-13 2021-11-05 唐山钢铁集团有限责任公司 Production method of thin 700 MPa-grade low-alloy high-strength steel
CN113621751A (en) * 2021-06-17 2021-11-09 日照钢铁控股集团有限公司 Efficient bottom blowing method for improving steelmaking flow field in converter blowing
CN114345938A (en) * 2022-01-04 2022-04-15 湖南华菱涟源钢铁有限公司 Method for producing high-strength steel with yield strength of 700MPa grade based on short process and low cost
CN114606450A (en) * 2022-04-21 2022-06-10 重庆钢铁股份有限公司 Manufacturing method of steel strip for high-strength heavy truck refitted cargo compartment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112958623A (en) * 2021-02-26 2021-06-15 日照钢铁控股集团有限公司 Steel for thin-specification elevator and ferrite zone rolling process and application thereof
CN113621751A (en) * 2021-06-17 2021-11-09 日照钢铁控股集团有限公司 Efficient bottom blowing method for improving steelmaking flow field in converter blowing
CN113600617A (en) * 2021-07-13 2021-11-05 唐山钢铁集团有限责任公司 Production method of thin 700 MPa-grade low-alloy high-strength steel
CN114345938A (en) * 2022-01-04 2022-04-15 湖南华菱涟源钢铁有限公司 Method for producing high-strength steel with yield strength of 700MPa grade based on short process and low cost
CN114345938B (en) * 2022-01-04 2024-02-09 湖南华菱涟源钢铁有限公司 Method for producing high-strength steel with yield strength of 700MPa level based on short process and low cost
CN114606450A (en) * 2022-04-21 2022-06-10 重庆钢铁股份有限公司 Manufacturing method of steel strip for high-strength heavy truck refitted cargo compartment

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