CN104928579A - Martensite broad hot strip with tensile strength of 1500MPa level and production method of martensite broad hot strip - Google Patents
Martensite broad hot strip with tensile strength of 1500MPa level and production method of martensite broad hot strip Download PDFInfo
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Abstract
The invention relates to a martensite broad hot strip with tensile strength of 1500MPa level and a production method of the martensite broad hot strip. The martensite broad hot strip comprises C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulphur), Nb (niobium), Ti (titanium) , B (boron), AlS (acetolactate synthase) and N (nitrogen), with the balance being Fe and inevitable impurity elements. Weight percentages of the C, the Si, the Mn, the Nb, the Ti, the B and the AlS are 0.13-0.17%, 0.40-0.60%, 1.30-1.60%, 0.020-0.050%, 0.02-0.05%, 0.0010-0.0030% and 0.010-0.060% respectively. Weight percentages of the P, the S and the N are smaller than or equal to 0.025%, 0.020% and 0.005% respectively. The production method includes smelting molten steel according to the set components, and subjecting the molten steel to continuous casting to obtain a plate blank; heating the plate blank to 1240-1300 DEG C, and performing high-pressure water descaling, controlled rolling, control-rolled cooling and reeling to obtain the broad hot strip. The produced broad hot strip has the advantages that yield strength is larger than 1000MPa, tensile strength is larger than 1500MPa, and ductility is larger than 10%; the broad hot strip is applied to hot-rolled plates of shear blades of excavators, a quenching process is omitted, and production cost is saved.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to tensile strength 1500MPa level martensite broad hot strip and production method thereof.
Background technology
Wear resisting steel approximately starts from 19th-century second half as a kind of special-purpose steel, in current industry, institute's production excavator edge of shovel steel belongs to wear resisting steel field, for reaching, there is higher-strength and plasticity, require to obtain martensitic stucture in smelting process, because being obtained the Tempering and Quenching mode that hot rolling raw material all adopts quenching to add tempering in the industry.
As incoming hot rolled slab is organized as martensitic stucture, will exempt quenching process, and save process period and processing charges greatly, will be that excavator cutting edge manufacturer is earnestly looked forward to.But due to hot-rolled production process feature, each rolling parameter fluctuates within the specific limits, cause controlling difficulty to finished product microtexture to strengthen, and its rolling complete after the section cooling stage, and determine that the microtexture stage residence time of final finished is shorter, therefore finding optimised process controling parameters in the operation of rolling, will be key content of the present invention.
Summary of the invention
The object of the invention is to exempt one heat treatment quenching process in excavator edge of shovel production process, by controlled rolling rolling and Controlled cooling process, provide a kind of tensile strength 1500MPa level martensite broad hot strip and production method thereof.
An object of the present invention is to provide a kind of tensile strength 1500MPa level martensite broad hot strip, described martensite broad hot strip chemical composition 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%, surplus is Fe and inevitable impurity element.
Another object of the present invention is to the production method that a kind of above-mentioned tensile strength 1500MPa level martensite broad hot strip is provided, comprise the steps:
1) according to mass percent be: 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%, surplus is the set component smelting molten steel of Fe and inevitable impurity, and molten steel obtains slab through RH vacuum outgas, continuous casting working procedure;
2) by heating of plate blank to 1240 ~ 1300 DEG C, broad hot strip is obtained through high-pressure water descaling, controlled rolling, controlled cooling model, coiling process; Described controlled rolling operation comprises roughing, Coil Box is batched, finish rolling.
Roughing of the present invention is after 5 road rollings, and temperature out is 1080 ~ 1140 DEG C.
Finish rolling of the present invention adopts 7 rolling mill rollings, temperature in 1050 ~ 1110 DEG C, and temperature out is 880 ~ 920 DEG C.
Controlled cooling model of the present invention comprises controlled cooling model speed and coiling temperature, section cooling speed 60 ~ 80 DEG C/S, coiling temperature 100 ~ 200 DEG C.
High-pressure water descaling pressure of the present invention 18 ~ 22MPa.
Mentality of designing of the present invention is as follows:
Each alloys producing and mechanism:
C:C is the very good and solution strengthening element of cheapness of strengthening effect, according to the applicable cases of this steel grade, main as the excavator edge of shovel, general employing welding processing is shaping, therefore require that material is while meeting requirement of strength, there is good wear resisting property and welding property, if its content is less than 0.12%, then can not meet the requirement of the strength of materials; If its content is greater than 0.20%, then can not meet the good welds performance of material.So, its content is limited to 0.13 ~ 0.17% scope.
Si:Si can improve the hardening capacity of steel, has and reduces the effect of austenite to volume change during martensitic transformation, thus effectively control the generation of quenching crack; Can Carbon diffusion be hindered when low-temperaturetempering, delay the speed of martensite decomposition and carbide agglomeration, steel hardness when tempering be declined comparatively slow, significantly improve steel belt roof bolt stability and intensity.So, its content is limited to 0.40 ~ 0.60% scope.
Mn:Mn improves intensity and the most effective element of toughness.If its content is less than 0.80%, then can not meet strength of materials requirement; But add the manganese of volume, can have a negative impact to the component segregation of product.Given this, be defined as 1.60% by it, so, its content is limited to 1.30 ~ 1.60% scopes.
P: in order to avoid the welding property of material, stamping formabilily, toughness, suitability for secondary processing worsen, setting its upper content limit is 0.025%.
S:S is the element be harmful to very much.Sulphur in steel often exists with the oxide morphology of manganese, and the impelling strength of this sulfide inclusion to steel is very disadvantageous, and causes the anisotropy of performance, therefore, sulphur content in steel need be controlled more low better.Based on the consideration to Steel Sheet technique and manufacturing cost, plan sulphur content in steel and control below 0.020%.
Nb, Ti: the effectively element of crystal grain thinning, raising intensity and toughness, is present in steel with the form of carbide and carbonitride.Nb can significantly improve austenite non-recrystallization temperature, has strong effect to crystal grain thinning.Ti is carbide forming element, has obvious effect to the intensity improving steel, and the present invention tries one's best, and control Nb content is 0.020 ~ 0.050%, Ti content is 0.02 ~ 0.05%.
B: add the through hardening performance that micro-B just can significantly improve steel in steel, the carbon-boron compound raising simultaneously formed in steel is conducive to improving its plasticity and toughness.But when Boron contents exceedes a certain amount of, produce boron phase in tissue, reduce the plasticity and toughness of material, B content is 0.0010 ~ 0.0030%.
Als:Al is reductor conventional in steel.A small amount of aluminium is added in steel, can crystal grain thinning, improve impelling strength.Al also has oxidation-resistance and corrosion resistance, and aluminium silicon share, and can significantly improve the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance.But will affect the hot workability of steel, welding property and machinability when Al exceedes a certain amount of, therefore, Als content is 0.010 ~ 0.060%.
N:N exists with the form of nitride or carbonitride in steel, especially easily forms titanium nitride with titanium in steel, has a negative impact to the plasticity of steel and fatigue property, for this reason in the present invention, and N content control≤0.005%.
The beneficial effect that produces of technique scheme is adopted to be: 1, the broad hot strip yield strength > 1000MPa that produces of the present invention, tensile strength > 1500 MPa, unit elongation >=10%, is organized as ferrite and bainite that martensite adds trace; 2, the present invention's martensitic stucture tensile strength 1500MPa level of producing is for excavator cutting edge hot-rolled coil, is next step Tempering and Quenching, omits a step quenching manufacturing procedure, simplifies procedure of processing, greatly save process period and processing charges.
Accompanying drawing explanation
Fig. 1 produces by the present invention the microstructure of wide steel strip.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the present invention is further detailed explanation.
Embodiment 1
Tensile strength 1500MPa level martensite broad hot strip, chemical composition 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%, surplus is 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 descaling, roughing is after 5 road rollings, and temperature out is 1105 DEG C, batches through Coil Box, and finish rolling adopts 7 rolling mill rollings, entry temperature at finishing 1075 DEG C, and temperature out is 890 DEG C; Be that 75 DEG C/S carries out section cooling with cooling rate, 153 DEG C are batched and obtain broad hot strip.
Embodiment 2
Tensile strength 1500MPa level martensite broad hot strip, chemical composition 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%, surplus is 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 descaling, roughing is after 5 road rollings, and temperature out is 1133 DEG C, batches through Coil Box, and finish rolling adopts 7 rolling mill rollings, entry temperature at finishing 1100 DEG C, and temperature out is 916 DEG C; Speed 77 DEG C/S carries out section cooling, and 140 DEG C are batched and obtain broad hot strip.
Embodiment 3
Tensile strength 1500MPa level martensite broad hot strip, chemical composition 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%, surplus is 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 descaling, roughing is after 5 road rollings, and temperature out is 1122 DEG C, batches through Coil Box, and finish rolling adopts 7 rolling mill rollings, entry temperature at finishing 1092 DEG C, and temperature out is 902 DEG C; Speed 70 DEG C/S carries out section cooling, and 190 DEG C are batched and obtain broad hot strip.
Embodiment 4
Tensile strength 1500MPa level martensite broad hot strip, chemical composition 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%, surplus is 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 descaling, roughing is after 5 road rollings, and temperature out is 1080 DEG C, batches through Coil Box, and finish rolling adopts 7 rolling mill rollings, entry temperature at finishing 1050 DEG C, and temperature out is 880 DEG C; Speed 60 DEG C/S carries out section cooling, and 100 DEG C are batched and obtain broad hot strip.
Embodiment 5
Tensile strength 1500MPa level martensite broad hot strip, chemical composition 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%, surplus is 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 descaling, roughing is after 5 road rollings, and temperature out is 1130 DEG C, batches through Coil Box, and finish rolling adopts 7 rolling mill rollings, entry temperature at finishing 1100 DEG C, and temperature out is 920 DEG C; Speed 80 DEG C/S carries out section cooling, and 200 DEG C are batched and obtain broad hot strip.
The micro-organization chart of the tensile strength 1500MPa level martensite broad hot strip that accompanying drawing 1 is produced for the present invention, martensite content is greater than 90%, and surplus is that ferrite adds bainite and is less than 10%.
Carry out mechanics properties testing to embodiment 1-5 in the application, result is as shown in table 1.Example 1 ~ 5 production martensitic stucture hot-rolled coil yield strength 1096 ~ 1210MPa, tensile strength 1530 ~ 1705MPa, unit elongation 10.5 ~ 13%, has good mechanical strength and plasticity coupling.
The corresponding hot-rolled coil mechanical property of table 1 example 1 ~ 5
Claims (6)
1. tensile strength 1500MPa level martensite broad hot strip, is characterized in that, described martensite broad hot strip chemical composition 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%, surplus is Fe and inevitable impurity element.
2., based on the production method of tensile strength 1500MPa level martensite broad hot strip according to claim 1, it is characterized in that, comprise the steps:
1) according to mass percent be: 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%, surplus is the set component smelting molten steel of Fe and inevitable impurity, and molten steel obtains slab through RH vacuum outgas, continuous casting working procedure;
2) by heating of plate blank to 1240 ~ 1300 DEG C, broad hot strip is obtained through high-pressure water descaling, controlled rolling, controlled cooling model, coiling process; Described controlled rolling operation comprises roughing, Coil Box is batched, finish rolling.
3. production method according to claim 2, is characterized in that, described roughing is after 5 road rollings, and temperature out is 1080 ~ 1140 DEG C.
4. production method according to claim 2, is characterized in that, described finish rolling adopts 7 rolling mill rollings, temperature in 1050 ~ 1110 DEG C, and temperature out is 880 ~ 920 DEG C.
5. production method according to claim 2, is characterized in that, described controlled cooling model comprises controlled cooling model speed and coiling temperature, section cooling speed 60 ~ 80 DEG C/S, coiling temperature 100 ~ 200 DEG C.
6. production method according to claim 2, is characterized in that, described high-pressure water descaling pressure 18 ~ 22MPa.
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| WO2019130713A1 (en) * | 2017-12-27 | 2019-07-04 | Ｊｆｅスチール株式会社 | High strength steel sheet and method for producing same |
| CN111593264A (en) * | 2020-06-28 | 2020-08-28 | 武汉钢铁有限公司 | Tempering-free wear-resistant hot-rolled strip steel and production method thereof |
| CN111607736A (en) * | 2020-06-28 | 2020-09-01 | 武汉钢铁有限公司 | Wear-resistant steel with excellent welding performance and production method thereof |
| CN111663080A (en) * | 2020-06-23 | 2020-09-15 | 中南大学 | Manufacturing method of fine-grain low-carbon high-strength steel thin strip |
| CN113215491A (en) * | 2021-05-07 | 2021-08-06 | 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 |
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| JP6562180B1 (en) * | 2017-12-27 | 2019-08-21 | Ｊｆｅスチール株式会社 | High strength steel plate and manufacturing method thereof |
| CN111527224A (en) * | 2017-12-27 | 2020-08-11 | 杰富意钢铁株式会社 | High-strength steel sheet and method for producing same |
| US11492677B2 (en) | 2017-12-27 | 2022-11-08 | Jfe Steel Corporation | High-strength steel sheet and method for producing the same |
| WO2019130713A1 (en) * | 2017-12-27 | 2019-07-04 | Ｊｆｅスチール株式会社 | High strength steel sheet and method for producing 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 |
| CN111663080A (en) * | 2020-06-23 | 2020-09-15 | 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 |
| CN111607736A (en) * | 2020-06-28 | 2020-09-01 | 武汉钢铁有限公司 | Wear-resistant steel with excellent welding performance and production method thereof |
| WO2022001886A1 (en) * | 2020-06-28 | 2022-01-06 | 武汉钢铁有限公司 | Tempering-free wear-resistant hot-rolled strip steel and production method thereof |
| CN111593264A (en) * | 2020-06-28 | 2020-08-28 | 武汉钢铁有限公司 | Tempering-free wear-resistant hot-rolled strip steel and production method thereof |
| CN113215491A (en) * | 2021-05-07 | 2021-08-06 | 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 |
| CN113528933A (en) * | 2021-05-31 | 2021-10-22 | 武汉钢铁有限公司 | Hot continuous rolling complex phase high-strength steel and production method thereof |
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