CN109797339A - A kind of tensile strength >=960MP martensite Micro Alloying high-strength steel and its manufacturing method - Google Patents

A kind of tensile strength >=960MP martensite Micro Alloying high-strength steel and its manufacturing method Download PDF

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Publication number
CN109797339A
CN109797339A CN201910150147.1A CN201910150147A CN109797339A CN 109797339 A CN109797339 A CN 109797339A CN 201910150147 A CN201910150147 A CN 201910150147A CN 109797339 A CN109797339 A CN 109797339A
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China
Prior art keywords
steel
temperature
strength
control
micro alloying
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Chinese (zh)
Inventor
刘志璞
苗隽
徐伟
赵迪
闵洪刚
周晏锋
张城铭
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Bengang Steel Plates Co Ltd
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Bengang Steel Plates Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention belongs to steelmaking technical fields, more particularly to a kind of tensile strength >=960MP martensite Micro Alloying high-strength steel and its manufacturing method, anneal → sample according to molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting → heating → 2300mm hot continuous rolling → control cool down → is batched → → process flow examined of function manufactures.The Micro Alloying 960MPa high tensile hot rolled steel sheet produced by this technique, with the processing performances such as excellent mechanical property and good cutting, welding, fill up the blank of domestic such steel grade, alternative import similar product, increase enterprise's rolling shapes, it realizes higher final product quality and yield rate, there is good economic benefit.

Description

A kind of tensile strength >=960MP martensite Micro Alloying high-strength steel and its manufacturing method
Technical field
The invention belongs to steelmaking technical fields, and in particular to a kind of tensile strength >=960MP martensite Micro Alloying high-strength steel And its manufacturing method.
Background technique
Currently, external developed country focuses on using high strength construction steel in terms of steel construction steel very much, steel Strength grade is minimum to use 275MPa grades, largely uses 420,460,490,550,590MPa grades of steel, and mating corresponding Codes and standards, major industrial country, the world all develop respective steel for engineering machinery series.Such as the SSAB of Sweden, Japan JFE etc. is designed by reasonable microalloying ingredient and advanced production technology, has developed the height that strength grade is 1100MPa Strength steel sheet.The more imports of the steel plate of 960MPa or more needed for China's construction machinery industry use the brand, and price is very high It is expensive.
In recent years, China has also carried out the research work of super-high strength steel, and Iron and Steel Research Geueral Institute passes through to micro-alloying technology Further investigation and novel thermal process technology development, developed completely new microstructure control technology, carried out 960MPa grades of superelevation have also been developed in the R&D work of Q960MPa, Q1100MPa, Q1300MPa grades of steel for engineering machinery, Baosteel Strong steel production line, but it is not able to achieve stable mass production.
Based on the above circumstances, developing the more advanced advanced super-high strength steel of 960MPa grades of Micro Alloying in China just seems outstanding To be important, it once succeeding in developing, on the one hand can meet the needs of domestic market super Materials with High Strength advanced to this rank, realize domestic Change, on the other hand, this also has important directive significance in the steel grade of the following exploitation higher level to China.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of tensile strength >=960MP martensite Micro Alloying high-strength steel And its manufacturing method.
The invention is realized in this way providing a kind of manufacturer of tensile strength >=960MP martensite Micro Alloying high-strength steel Method, it is cold according to molten iron pretreatment → converter smelting → LF refining → RH refining → continuous casting → heating → 2300mm hot continuous rolling → control But → batch → anneal → sample → function examine process flow manufacture, in which:
Heating tapping temperature in heating stepses is 1200-1250 DEG C;Finishing temperature is 820-890 DEG C;Coiling temperature 400-460℃;Annealing temperature is 350-600 DEG C.
Further, each step of steelmaking process specifically:
1) molten iron pre-processes
It pre-processes and scratches clean slag into furnace S≤0.0030wt.%, P≤0.01wt.%, using fine fodder steel scrap;
2) converter smelting
Converter catch carbon hit at first time avoids a little blowing;Ladle argon gas purging before tapping, control tapping hole avoid diffusing;
3) it refines
Using LF+RH dual path process, LF treatment process keeps micro-positive pressure, and strict control LF increases N, it is desirable that and increasing N amount≤ 10ppm;LF makes the reducing slag of good fluidity using active lime, fluorite, controls Argon intensity, avoids molten steel exposed;Using silicon Calcium line Calcium treatment feeds 500 meters of CaSi line, makes the abundant nodularization of field trash;
4) continuous casting
Whole process carries out molding casting, opens using wrapping in argon gas purging before pouring, casting process accomplishes that no molten steel is exposed, stringent to control N is inhaled at the mouth of a river processed, and control increases N≤5ppm;Using cinder inclusion in high alkalinity, so as to the removal of steel inclusion;Steel pouring process investment is light Press function;Steel pouring process keeps permanent pulling rate;The continuous casting degree of superheat controls target and is not more than 25 DEG C, and slab heat crosses hot charging, remaining plate Base is placed on Ku Nei slow cooling area.
Further, each step of course of hot rolling specifically:
A) it heats
1150~1250 DEG C of heating temperature, 1200~1250 DEG C of target tapping temperature, heating furnace oven cavity atmosphere is controlled, is reduced The generation of slab iron scale guarantees that heating temperature is uniform;
B) it rolls, batch
Waste mill train time selection 3+3 scheme control;The sharing of load of finish rolling model is carried out, guarantees rolling stability;Finish to gauge temperature Degree: 820~890 DEG C;Coiling temperature: 400~460 DEG C, refrigerating mode opens cold, discontinuous manner using second group, guarantees finish to gauge, volume Take the accurate control of temperature;Optimize and revise the control of interstand cooling water.
The present invention also provides tensile strength >=960MP martensite Micro Alloying high-strength steel of above method preparation.
Compared with the prior art, the advantages of the present invention are as follows:
1) the Micro Alloying 960MPa high tensile hot rolled steel sheet produced by this technique, with excellent mechanical property and well The processing performances such as cutting, welding, user's actual use achievees the purpose that reduce car body weight, and the use for fully meeting user needs It asks.
2) the Micro Alloying 960MPa high tensile hot rolled steel sheet produced using this technology, fills up the blank of domestic such steel grade, Alternative import similar product increases enterprise's rolling shapes, realizes higher final product quality and yield rate, has economical well Benefit.
Detailed description of the invention
Fig. 1 is the test steel CCT curve figure prepared in embodiment;
Fig. 2 is the test steel metallographic structure figure (20 μm) prepared in embodiment;
Fig. 3 is the test steel metallographic structure figure (10 μm) prepared in embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and It is not used in the restriction present invention.
Embodiment,
Tensile strength >=960MP martensite Micro Alloying high-strength steel is manufactured according to the method provided by the invention, tests tempering Ingredient and mass percent are (remaining is iron and inevitable impurity) as shown in the table:
C Mn Si Mo Ti Cr V B CEV
0.12 1.20 0.20 0.40 0.10 0.20 0.08 0.0020 0.46
One, it makes steel
1, molten iron pre-processes
It pre-processes and scratches clean slag into furnace S≤0.0030wt.%, P≤0.01wt.%;Using fine fodder steel scrap.
2, converter
Converter catch carbon hit at first time avoids a little blowing;Ladle argon gas purging before tapping, control tapping hole avoid diffusing.
3, it refines
Using LF+RH dual path process, strict control is required to gas content.It is required that LF treatment process keeps micro-positive pressure, Strict control LF increases N, it is desirable that increases N amount≤10ppm;LF makes the reducing slag of good fluidity, strict control using active lime, fluorite Argon intensity avoids molten steel exposed as far as possible;Using silicon-calcium wire Calcium treatments, 500 meters of CaSi line are fed, the sufficient nodularization of field trash is made, Improve properties of product.
4, continuous casting
Whole process carries out molding casting.It opens using being wrapped in argon gas purging before pouring, casting process accomplishes that no molten steel is exposed, stringent to control N is inhaled at the mouth of a river processed, and control increases N≤5ppm;Using cinder inclusion in high alkalinity, so as to the removal of steel inclusion;Steel pouring process investment is light Press function;Steel pouring process keeps permanent pulling rate;The continuous casting degree of superheat controls target and is not more than 25 DEG C.Slab heat crosses hot charging, remaining plate Base is placed on Ku Nei slow cooling area.
Two, hot rolling
1, heating furnace part
1150~1250 DEG C of heating temperature, 1200~1250 DEG C of target tapping temperature.Heating furnace oven cavity atmosphere is controlled, is reduced The generation of slab iron scale guarantees that heating temperature is uniform.
2, rolling, reel-up
Waste mill train time selection 3+3 scheme control;The sharing of load of finish rolling model is carried out, guarantees rolling stability;Finish to gauge temperature Degree: 830~890;Coiling temperature: 430~460, refrigerating mode opens cold, discontinuous manner using second group.Guarantee finish to gauge, batch temperature The accurate control of degree;Optimize and revise the control of interstand cooling water.
Three, it anneals
Its purpose is mainly the transformation of tissue morphology in steel after studying annealing.Under normal conditions, it will be precipitated in steel after annealing The carbonitride of alloy part element, and the increase of precipitate will affect the intensity and plasticity of steel, studies an alloy system and exists Under identical rolling mill practice, after carrying out different annealing, the variation of tissue and performance in steel, the setting of annealing test temperature are analyzed 350℃-600℃。
Test result:
With reference to Fig. 1, for the CCT curve figure of test steel manufactured in the present embodiment;It referring to figs. 2 and 3, is different proportion lower The metallographic structure figure of the test steel of embodiment preparation.
1, steel rolling technological parameter is tested
Austenitizing temperature/DEG C 1200~1250
Crude green body thickness/mm 60
Road number 7
Target thickness/mm 6
Finishing temperature/DEG C 830~890
Cooling velocity/(DEG C/s) >=40~60
Annealing temperature/DEG C 350~600
2, sample Steel Properties
Comparative example,
It is compared with the Micro Alloying 960MPa high-strength steel of actual production in the present invention and Shoudu Iron and Steel Co quenching and tempering, high SQ960, As a result as follows:
Chemical component comparison
Steel grade C Mn Si Mo Ti Nb Cr V B
BG960 0.12 1.20 0.20 0.40 0.10 -- 0.20 0.08 0.0020
SQ960 0.11 1.38 0.24 0.39 0.017 0.028 0.45 0.098 0.001
Wherein BG960 is to utilize technology in the present invention, the Micro Alloying 960MPa high-strength steel of this steel actual production, SQ960 is the quenched 960MPa high-strength steel of Shoudu Iron and Steel Co production.
Mechanical property comparison
Using the Micro Alloying 960MPa high-strength steel of technology production in the present invention it can be seen from comparing result, reach To the strength level of quenched 960MPa high-strength steel.Therefore, the Micro Alloying 960MPa high-strength steel in the present invention not only reduces alloy Cost also eliminates later period modifier treatment step, while energy saving, simplifies production technology, improve technology controlling and process and The reliability of the control of product reduces the labor intensity of producers.

Claims (4)

1. a kind of tensile strength >=960MP martensite Micro Alloying high-strength steel manufacturing method, which is characterized in that locate in advance according to molten iron Reason → converter smelting → LF refining → RH refining → continuous casting → heating → 2300mm hot continuous rolling → control cool down → is batched → is annealed The process flow manufacture that → sampling → function is examined, in which:
Heating tapping temperature in heating stepses is 1200-1250 DEG C;Finishing temperature is 820-890 DEG C;Coiling temperature 400-460 ℃;Annealing temperature is 350-600 DEG C.
2. tensile strength as described in claim 1 >=960MP martensite Micro Alloying high-strength steel manufacturing method, feature exist In each step of steelmaking process specifically:
1) molten iron pre-processes
It pre-processes and scratches clean slag into furnace S≤0.0030wt.%, P≤0.01wt.%, using fine fodder steel scrap;
2) converter smelting
Converter catch carbon hit at first time avoids a little blowing;Ladle argon gas purging before tapping, control tapping hole avoid diffusing;
3) it refines
Using LF+RH dual path process, LF treatment process keeps micro-positive pressure, and strict control LF increases N, it is desirable that increases N amount≤10ppm; LF makes the reducing slag of good fluidity using active lime, fluorite, controls Argon intensity, avoids molten steel exposed;Using silicon-calcium wire calcium Processing feeds 500 meters of CaSi line, makes the abundant nodularization of field trash;
4) continuous casting
Whole process carries out molding casting, opens using wrapping in argon gas purging before pouring, casting process accomplishes that no molten steel is exposed, strict control water Mouth inhales N, and control increases N≤5ppm;Using cinder inclusion in high alkalinity, so as to the removal of steel inclusion;Steel pouring process puts into slighter compress Function;Steel pouring process keeps permanent pulling rate;The continuous casting degree of superheat controls target and is not more than 25 DEG C, and slab heat crosses hot charging, and remaining slab is put It sets in Ku Nei slow cooling area.
3. tensile strength as described in claim 1 >=960MP martensite Micro Alloying high-strength steel manufacturing method, feature exist In each step of course of hot rolling specifically:
A) it heats
1150~1250 DEG C of heating temperature, 1200~1250 DEG C of target tapping temperature, heating furnace oven cavity atmosphere is controlled, reduces slab The generation of iron scale guarantees that heating temperature is uniform;
B) it rolls, batch
Waste mill train time selection 3+3 scheme control;The sharing of load of finish rolling model is carried out, guarantees rolling stability;Finishing temperature: 820~890 DEG C;Coiling temperature: 400~460 DEG C, refrigerating mode opens cold, discontinuous manner using second group, guarantees finish to gauge, batches The accurate control of temperature;Optimize and revise the control of interstand cooling water.
4. according to claims 1 or 2 or tensile strength >=960MP martensite Micro Alloying high-strength steel of 3 method preparation.
CN201910150147.1A 2019-02-28 2019-02-28 A kind of tensile strength >=960MP martensite Micro Alloying high-strength steel and its manufacturing method Pending CN109797339A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111187983A (en) * 2020-02-17 2020-05-22 本钢板材股份有限公司 Special steel for 750 MPa-grade special container and preparation process thereof
CN111187994A (en) * 2020-02-17 2020-05-22 本钢板材股份有限公司 Steel C60 hot-rolled coil for high-C cutter and preparation method thereof
CN111235477A (en) * 2020-02-28 2020-06-05 本钢板材股份有限公司 950MPa thin-specification hot-rolled automobile girder steel and preparation method thereof
CN111270135A (en) * 2020-02-17 2020-06-12 本钢板材股份有限公司 Economical weathering steel produced by strengthening RE-P and preparation process thereof
CN111286669A (en) * 2020-02-17 2020-06-16 本钢板材股份有限公司 Martensite hot-rolled high-strength steel with yield strength not less than 900Mpa and preparation method thereof
CN111621688A (en) * 2020-03-24 2020-09-04 本钢板材股份有限公司 Novel steel special for steel structure and preparation method thereof

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111187983A (en) * 2020-02-17 2020-05-22 本钢板材股份有限公司 Special steel for 750 MPa-grade special container and preparation process thereof
CN111187994A (en) * 2020-02-17 2020-05-22 本钢板材股份有限公司 Steel C60 hot-rolled coil for high-C cutter and preparation method thereof
CN111270135A (en) * 2020-02-17 2020-06-12 本钢板材股份有限公司 Economical weathering steel produced by strengthening RE-P and preparation process thereof
CN111286669A (en) * 2020-02-17 2020-06-16 本钢板材股份有限公司 Martensite hot-rolled high-strength steel with yield strength not less than 900Mpa and preparation method thereof
CN111235477A (en) * 2020-02-28 2020-06-05 本钢板材股份有限公司 950MPa thin-specification hot-rolled automobile girder steel and preparation method thereof
CN111235477B (en) * 2020-02-28 2021-09-21 本钢板材股份有限公司 950MPa thin-specification hot-rolled automobile girder steel and preparation method thereof
CN111621688A (en) * 2020-03-24 2020-09-04 本钢板材股份有限公司 Novel steel special for steel structure and preparation method thereof

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