CN104928579B - Tensile strength 1500MPa grades of martensite broad hot strip and its production method - Google Patents
Tensile strength 1500MPa grades of martensite broad hot strip and its production method Download PDFInfo
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- CN104928579B CN104928579B CN201510360868.7A CN201510360868A CN104928579B CN 104928579 B CN104928579 B CN 104928579B CN 201510360868 A CN201510360868 A CN 201510360868A CN 104928579 B CN104928579 B CN 104928579B
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Abstract
The present invention relates to tensile strength 1500MPa grades of martensite broad hot strip and its production method, its chemical constituent and weight percent content are：C：0.13~0.17%, Si：0.40~0.60%, Mn：1.30~1.60%, P≤0.025%, S≤0.020%, Nb：0.020~0.050%, Ti：0.02~0.05%, B：0.0010~0.0030%, Als：0.010~0.060%, N≤0.005%, balance of Fe and inevitable impurity element.Production method is：According to set component smelting molten steel, molten steel obtains slab through continuous casting working procedure；By heating of plate blank to 1240~1300 DEG C, broad hot strip is obtained by high-pressure water descaling, controlled rolling, control cooling, coiling process.Hot-rolled coil yield strength ＞ 1000MPa, tensile strength ＞ 1500MPa, elongation percentage >=10% that the present invention is produced；For excavator cutting edge hot-rolled coil, quenching process is omitted, save production cost.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to tensile strength 1500MPa grades of martensite broad hot strip and its
Production method.
Background technology
Abrasion-resistant stee begins approximately even with the 19th-century second half as a kind of special-purpose steel, institute's production excavator edge of shovel in current industry
Belong to abrasion-resistant stee field with steel, be that can reach with higher-strength and plasticity, require to obtain martensitic structure in smelting process, because
Hot rolling raw material is obtained using the Tempering and Quenching mode of quenching add-back fire in the industry.
As incoming hot rolled slab is organized as martensitic structure, quenching process will be exempted, be greatly saved process time and processing
Expense, will be that excavator cutting edge manufacturer is earnestly looked forward to.But due to hot-rolled production process feature, each rolling parameter is certain
In the range of fluctuate, cause to finished product microstructure control difficulty increase, and its rolling after the completion of the section cooling stage, and determine most
The microstructure stage residence time of finally finished is shorter, therefore optimised process control parameter is found in the operation of rolling, will be this hair
Bright key content.
The content of the invention
It is an object of the invention to exempt one heat treatment quenching process in excavator edge of shovel production process, rolled by controlled rolling
System and Controlled cooling process, there is provided a kind of tensile strength 1500MPa grades of martensite broad hot strip and its production method.
An object of the present invention is to provide a kind of tensile strength 1500MPa grades of martensite broad hot strip, the geneva
Body broad hot strip chemical constituent and weight percent content are：C：0.13~0.17%, Si：0.40~0.60%, Mn：1.30~
1.60%, P≤0.025%, S≤0.020%, Nb：0.020~0.050%, Ti：0.02~0.05%, B：0.0010~0.0030%,
Als：0.010~0.060%, N≤0.005%, balance of Fe and inevitable impurity element.
Another object of the present invention is to provide a kind of life of above-mentioned tensile strength 1500MPa grades of martensite broad hot strip
Product method, comprises the steps：
1）It is according to mass percent：C：0.13~0.17%, Si：0.40~0.60%, Mn：1.30~1.60%, P≤
0.025%, S≤0.020%, Nb：0.020~0.050%, Ti：0.02~0.05%, B：0.0010~0.0030%, Als：0.010
The set component smelting molten steel of~0.060%, N≤0.005%, balance of Fe and inevitable impurity, molten steel through RH vacuum outgas,
Continuous casting working procedure obtains slab；
2）By heating of plate blank to 1240~1300 DEG C, by high-pressure water descaling, controlled rolling, control cooling, coiling process
Obtain broad hot strip；The controlled rolling operation is batched including roughing, Coil Box, finish rolling.
After roughing of the present invention is rolled through 5 roads, outlet temperature is 1080~1140 DEG C.
Finish rolling of the present invention is rolled using 7 rolling mills, 1050~1110 DEG C of inlet temperature, and outlet temperature is 880~920
℃。
Control of the present invention is cooled down includes control cooling velocity and coiling temperature, 60~80 DEG C/S of section cooling speed,
100~200 DEG C of coiling temperature.
18~22MPa of high-pressure water descaling pressure of the present invention.
Mentality of designing of the invention is as follows：
Each alloys producing and mechanism：
C:C is the very good and cheap solution strengthening element of invigoration effect, main to use according to the applicable cases of this steel grade
Make the excavator edge of shovel, it is general using welding processing shaping, therefore it is required that material is while intensity requirement is met, with good
Anti-wear performance and welding performance, if its content is less than 0.12%, can not meet the requirement of the strength of materials；If its content is big
In 0.20%, then the good welds performance of material can not be met.So, its content is limited to 0.13~0.17% scope.
Si:Si can improve the quenching degree of steel, the effect of Volume Changes when being reduced austenite to martensite transfor mation, so that
The effectively generation of control hardening flaw；Carbon diffusion can be hindered in lonneal, delays martensite to decompose and carbide aggregation
The speed grown up, declines steel hardness in tempering relatively slow, significantly improves steel belt roof bolt stability and intensity.So, contained
Amount is limited to 0.40~0.60% scope.
Mn:Mn is to improve intensity and the maximally effective element of toughness.If its content is less than 0.80%, material can not be met
Material intensity requirement；But the manganese of volume is added, can be had a negative impact to the component segregation of product.In consideration of it, will limit thereon
It is 1.60%, so, its content is limited to 1.30~1.60% scopes.
P：In order to avoid the welding performance of material, stamping formabilily, toughness, suitability for secondary processing deteriorate, set
Its upper content limit is 0.025%.
S：S is very harmful element.Sulphur in steel often exists with the oxide morphology of manganese, and this sulphide inculsion is to steel
Impact flexibility be very unfavorable, and cause the anisotropy of performance, therefore, sulfur content in steel need to be controlled more low more
It is good.Based on the consideration to Steel Sheet technique and manufacturing cost, sulfur content control is below 0.020% in planning steel.
Nb、Ti：Effective crystal grain thinning, the element for improving intensity and toughness, exist in the form of carbide and carbonitride
Yu Gangzhong.Nb can significantly improve austenite non-recrystallization temperature, play the role of to crystal grain thinning strong.Ti is that carbide forms unit
Element, has obvious effect to the intensity of raising steel, and it is that 0.020~0.050%, Ti contents are that the present invention controls Nb contents as far as possible
0.02~0.05%.
B：Micro B is added just to be remarkably improved the through hardening performance of steel in steel, while the carbon-boron compound formed in steel is improved
Be conducive to improving its plasticity and toughness.But when Boron contents exceed a certain amount of, boron phase is produced in tissue, reduce the plasticity and toughness of material, B content
It is 0.0010~0.0030%.
Als:Al is the deoxidier commonly used in steel.A small amount of aluminium is added in steel, can crystal grain thinning, raising impact flexibility.Al
Also there is inoxidizability and corrosion resistance, aluminium silicon is shared, and is remarkably improved the high temperature non-scale performance and high-temperature corrosion resistance of steel
Ability.But hot-working character, welding performance and the machinability of steel will be influenceed when Al exceedes a certain amount of, therefore, Als contains
Measure is 0.010~0.060%.
N:N exists in steel in the form of nitride or carbonitride, especially easily forms titanium nitride with titanium in steel, right
The plasticity and fatigue behaviour of steel have a negative impact, be this in the present invention, N content control≤0.005%.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the broad hot strip surrender that the present invention is produced is strong
Degree ＞ 1000MPa, the MPa of tensile strength ＞ 1500, elongation percentage >=10% is organized as martensite plus micro ferrite and bayesian
Body；2nd, 1500MPa grades of the martensitic structure tensile strength that the present invention is produced is used for excavator cutting edge hot-rolled coil, is next step
Tempering and Quenching, omits step quenching manufacturing procedure, simplifies procedure of processing, has been greatly saved process time and processing charges.
Brief description of the drawings
Fig. 1 by the present invention production wide flat steel microscopic structure.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further detailed explanation.
Embodiment 1
Tensile strength 1500MPa grades of martensite broad hot strip, chemical constituent and weight percent content are：C：0.14%,
Si：0.46%, Mn：1.35%, P：0.011%, S：0.003%, Nb：0.020%, Ti：0.03%, B：0.0012%, Als：0.017%,
N：0.0036%, balance of Fe and inevitable impurity element.
Production method comprises the steps：
1）According to above-mentioned set component smelting molten steel, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1265 DEG C, through excess pressure 19MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature
It is 1105 DEG C, is batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1075 DEG C of entry temperature at finishing, outlet temperature is 890 DEG C；
Section cooling is carried out by 75 DEG C/S of cooling rate, 153 DEG C are batched and obtain broad hot strip.
Embodiment 2
Tensile strength 1500MPa grades of martensite broad hot strip, chemical constituent and weight percent content are：C：0.17%,
Si：0.54%, Mn：1.53%, P：0.009%, S：0.003%, Nb：0.034%, Ti：0.048%, B：0.0029%, Als：0.031%,
N：0.0044%, balance of Fe and inevitable impurity element.
Production method comprises the steps：
1）According to above-mentioned set component smelting molten steel, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1293 DEG C, through excess pressure 19MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature
It is 1133 DEG C, is batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1100 DEG C of entry temperature at finishing, outlet temperature is 916 DEG C；
77 DEG C/S of speed carries out section cooling, and 140 DEG C are batched and obtain broad hot strip.
Embodiment 3
Tensile strength 1500MPa grades of martensite broad hot strip, chemical constituent and weight percent content are：C：0.15%,
Si：0.45%, Mn：1.41%, P：0.007%, S：0.004%, Nb：0.031%, Ti：0.040%, B：0.0020%, Als：0.021%,
N：0.0032%, balance of Fe and inevitable impurity element.
Production method comprises the steps：
1）According to above-mentioned set component smelting molten steel, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1282 DEG C, through excess pressure 18MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature
It is 1122 DEG C, is batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1092 DEG C of entry temperature at finishing, outlet temperature is 902 DEG C；
70 DEG C/S of speed carries out section cooling, and 190 DEG C are batched and obtain broad hot strip.
Embodiment 4
Tensile strength 1500MPa grades of martensite broad hot strip, chemical constituent and weight percent content are：C：0.13%,
Si：0.40%, Mn：1.30%, P：0.025%, S：0.020%, Nb：0.020%, Ti：0.02%, B：0.0010%, Als：0.010%,
N：0.005%, balance of Fe and inevitable impurity element.
Production method comprises the steps：
1）According to above-mentioned set component smelting molten steel, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1240 DEG C, through excess pressure 20MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature
It is 1080 DEG C, is batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1050 DEG C of entry temperature at finishing, outlet temperature is 880 DEG C；
60 DEG C/S of speed carries out section cooling, and 100 DEG C are batched and obtain broad hot strip.
Embodiment 5
Tensile strength 1500MPa grades of martensite broad hot strip, chemical constituent and weight percent content are：C：0.17%,
Si：0.60%, Mn：1.60%, P：0.025%, S：0.020%, Nb：0.050%, Ti：0.05%, B：0.0030%, Als：0.060%,
N：0.0050%, balance of Fe and inevitable impurity element.
Production method comprises the steps：
1）According to above-mentioned set component smelting molten steel, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1290 DEG C, through excess pressure 22MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature
It is 1130 DEG C, is batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1100 DEG C of entry temperature at finishing, outlet temperature is 920 DEG C；
80 DEG C/S of speed carries out section cooling, and 200 DEG C are batched and obtain broad hot strip.
Accompanying drawing 1 is the tensile strength 1500MPa grades of micro-organization chart of martensite broad hot strip of present invention production, geneva
Body content is more than 90%, and balance of ferrite adds bainite to be less than 10%.
Mechanics properties testing is carried out to embodiment 1-5 in the application, as a result as shown in table 1.Example 1~5 produces geneva
Body tissue hot-rolled coil 1096~1210MPa of yield strength, 1530~1705MPa of tensile strength, elongation percentage 10.5~13%, tool
There is good mechanical strength and plasticity matching.
The corresponding hot-rolled coil mechanical property of 1 example of table 1~5
Claims (6)
1. a kind of tensile strength 1500MPa grades of martensite broad hot strip, it is characterised in that the martensite broad hot strip
Learn component and weight percent content is：C：0.17%, Si：0.54%, Mn：1.53%, P：0.009%, S：0.003%, Nb：
0.034%, Ti：0.048%, B：0.0029%, Als：0.031%, N：0.0044%, balance of Fe and inevitable impurity element.
2. a kind of tensile strength 1500MPa grades of martensite broad hot strip, it is characterised in that the martensite broad hot strip
Learn component and weight percent content is：C：0.17%, Si：0.60%, Mn：1.60%, P：0.025%, S：0.020%, Nb：
0.050%, Ti：0.05%, B：0.0030%, Als：0.060%, N：0.0050%, balance of Fe and inevitable impurity element.
3. a kind of production method of tensile strength 1500MPa grades of martensite broad hot strip, it is characterised in that including following steps
Suddenly：
1）It is according to mass percent：C：0.13~0.17%, Si：0.40~0.60%, Mn：1.30~1.60%, P≤0.025%,
S≤0.020%, Nb：0.020~0.050%, Ti：0.02~0.05%, B：0.0010~0.0030%, Als：0.010~
The set component smelting molten steel of 0.060%, N≤0.005%, balance of Fe and inevitable impurity, molten steel through RH vacuum outgas, even
Foundry work sequence obtains slab；
2）By heating of plate blank to 1265~1293 DEG C, obtained by high-pressure water descaling, controlled rolling, control cooling, coiling process
Broad hot strip；The controlled rolling operation is batched including roughing, Coil Box, finish rolling；After the roughing is rolled through 5 roads, outlet
Temperature is 1080~1140 DEG C；The finish rolling is rolled using 7 rolling mills, 1050~1110 DEG C of inlet temperature, and outlet temperature is 880
~920 DEG C；18~22MPa of the high-pressure water descaling pressure.
4. the production method of tensile strength 1500MPa grades of martensite broad hot strip according to claim 3, its feature exists
In the control cooling includes controlling cooling velocity and coiling temperature, 60~80 DEG C/s of section cooling speed, coiling temperature 100
~200 DEG C.
5. it is based on the tensile strength 1500MPa grades of production method of martensite broad hot strip described in claim 1 including following
Step：
1）According to set component smelting molten steel described in claim 1, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1293 DEG C, through excess pressure 19MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature is
1133 DEG C, batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1100 DEG C of entry temperature at finishing, outlet temperature is 916 DEG C；Speed
77 DEG C/s of degree carries out section cooling, and 140 DEG C are batched and obtain broad hot strip.
6. it is based on the tensile strength 1500MPa grades of production method of martensite broad hot strip described in claim 2 including following
Step：
1）According to claim 2 set component smelting molten steel, molten steel obtains slab through RH vacuum outgas, continuous casting working procedure；
2）By heating of plate blank to 1290 DEG C, through excess pressure 22MPa high-pressure water descalings, after roughing is rolled through 5 roads, outlet temperature is
1130 DEG C, batched through Coil Box, finish rolling is rolled using 7 rolling mills, 1100 DEG C of entry temperature at finishing, outlet temperature is 920 DEG C；Speed
80 DEG C/s of degree carries out section cooling, and 200 DEG C are batched and obtain broad hot strip.
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| US11492677B2 (en) | 2017-12-27 | 2022-11-08 | Jfe Steel Corporation | High-strength steel sheet and method for producing the same |
| CN111663080B (en) * | 2020-06-23 | 2021-11-12 | 中南大学 | Manufacturing method of fine-grain low-carbon high-strength steel thin strip |
| CN111593264B (en) * | 2020-06-28 | 2021-07-13 | 武汉钢铁有限公司 | Tempering-free wear-resistant hot-rolled strip steel and production method thereof |
| CN111607736B (en) * | 2020-06-28 | 2021-07-13 | 武汉钢铁有限公司 | Wear-resistant steel with excellent welding performance and production method thereof |
| CN113215491B (en) * | 2021-05-07 | 2022-06-17 | 马鞍山钢铁股份有限公司 | 1300 MPa-grade hot continuous rolling ultrahigh-strength steel plate and manufacturing method thereof |
| CN113528933B (en) * | 2021-05-31 | 2023-05-26 | 武汉钢铁有限公司 | Hot continuous rolling complex phase high-strength steel and production method thereof |
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| CN101676425B (en) * | 2008-09-18 | 2011-07-20 | 宝山钢铁股份有限公司 | Martensite abrasion-resistant steel with high strength |
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