CN103276310A - Rare-earth-containing H-shaped steel with low-temperature toughness and production method thereof - Google Patents
Rare-earth-containing H-shaped steel with low-temperature toughness and production method thereof Download PDFInfo
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Abstract
The invention relates to rare-earth-containing H-shaped steel with low-temperature toughness and a production method thereof, belonging to the technical field of metallurgy and molding. The steel contains the following raw materials in percentage by weight: 90% of blast-furnace molten iron and 10% of high-quality scrap steel; and a cast blank contains the following chemical ingredients in percentage by weight: 0.07-0.12% of C, 0.10-0.30% of Si, 1.10-1.40% of Mn, not higher than 0.015% of P, not higher than 0.005% of S, 0.10-0.30% of Cr, 0.90-1.20% of Ni, 0.05-0.20% of V, 0.01-0.03% of Ti, 0.01-0.04% of Al, 0.0005-0.010% of rare-earth element RE, lower than 0.10% of Cu and the balance of Fe and undetectable trace elements. The production method comprises the process flows of pre-treating molten iron, smelting in a top-bottom combined blowing converter, refining in an LF (Low Frequency) furnace, carrying out VD vacuum treatment, carrying out continuous square billet casting, cutting, heating the cast blank, carrying out high-pressure water phosphorous removal, carrying out cogging-down in BD1, rolling in BD2, carrying out high-pressure water phosphorous removal, carrying out CCS (Carbon Capture and Storage)) universal rolling, straightening, cooling, sawing and carrying out flaw detection. The steel has the mechanical properties that the yield strength is 460-530 MPa, the tensile strength is 630-720 MPa, the yield ratio is not greater than 0.80, the elongation percentage is not lower than 26%, and the lateral impact value aKV is not smaller than 100 J/cm<2> (at the temperature of -80 DEG C). The steel disclosed by the invention has the characteristics of low production cost, high strength, good low-temperature toughness and excellent welding performance.
Description
One, affiliated technical field:
The invention belongs to ferrous metal smelting and stress metal manufacture field, relate to a kind of have a low-temperature flexibility contain rare earth H shaped steel and production method thereof.
Two, background technology:
H shaped steel is a kind of economic section shaped steel, is widely used in fields such as bridge, Highrise buildings, weight handling equipment, structure stand and foundation pile, compares with joist steel to have advantages such as section modulus is big, in light weight.Because the outside is parallel in its leg, can make things convenient for assembling combination, bearing under the condition of same load, H shaped steel is saved 10%～15% steel than joist steel.The Antarctica has abundant Mineral resources and energy reserves, but lowest temperature there is about-80 ℃, and this just proposes the requirement of strictness to the low-temperature flexibility of H shaped steel.No matter traditional H shaped steel is from intensity, low-temperature flexibility, or welding property all can not satisfy the service requirements of this area, for this reason, has developed the high-quality H shaped steel that uses under the cold condition both at home and abroad in succession.
By retrieval, Chinese invention patent " a kind of have good low temperature impelling strength add boron H shaped steel and preparation method thereof " (number of patent application: 200810014488.8), because this H shaped steel just adds Nb, the B of trace on the basis of C, Mn steel, therefore the low temperature limit temperature of its use is-40 ℃, and toughness is not very high.Chinese invention patent " a kind of high ductility negative 110 degree low-temperature steel and manufacture method thereof " (number of patent application: 200810046958.9), because this low-temperature steel has added 3.2%～3.8% noble metal Ni, therefore the low temperature limit temperature of its use is-110 ℃, low-temperature flexibility is very high, but production cost is also very high.Chinese invention patent " a kind of low-temperature flexibility 1.5Ni steel and manufacture method thereof " (number of patent application: 200810033529.8), this low-temperature steel has added 1.2%～1.6% metal Ni, owing to adopt modifier treatment, therefore the low temperature limit temperature of its use is-80 ℃, low-temperature flexibility is also very high, but hardening and tempering process is not suitable for the production of H shaped steel, and H shaped steel can inequality causes big distortion even cracking because section stress distributes seriously in the quenching process.
Three, summary of the invention:
The purpose of this invention is to provide that a kind of production cost is low, intensity high and low temperature good toughness, welding property is good and can under-80 ℃ low temperature environment, use contain rare earth H shaped steel and production method thereof.
The object of the present invention is achieved like this:
With the blast-melted of weight percent 90% and 10% high-quality steel scrap as raw material.
Produce with following technical process: at first to the above-mentioned blast-melted pre-treatment of carrying out, together adding top and bottom combined blown converter with above-mentioned high-quality steel scrap then smelts, to smelt the good molten steel ladle of packing into again enters furnaceman LF position and carries out refining, enter the VD station after refining is finished and carry out the vacuum outgas processing, carry out bloom continuous casting again, and continuously cast bloom cut, then strand is heated, the strand that heats is rolled, be with temperature correction straight to H shaped steel, sawing is implemented in cold bed cooling back, and carries out carrying out flaw detection, and eligible is H shaped steel finished product.
Its brief description of the process is: roll among hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → billet continuous casting → cutting → strand heating → dephosphorize by high pressure water → BD1 cogging → BD2 → dephosphorize by high pressure water → CCS universal rolling → aligning → cooling → sawing → flaw detection.
The production process of continuously cast bloom is as described below:
1, with blast-melted through pre-treatment, make that the S amount (weight percent) that contains in the molten iron is reduced to below 0.010%.
2, pretreated molten iron is blended into top and bottom combined blown converter, add (weight percent) 10% high-quality steel scrap, adopt single slag technology to smelt, control finishing slag basicity and terminal point target, carry out deoxidation alloying in the tapping process, final deoxygenation adopts aluminium deoxidation technology, and tapping process must pushing off the slag or skimmed adding lime piece after the tapping process interalloy adds.
3, carry out concisely at the LF stove, the refining whole process is normally blown Ar on request, adopts from rudimentary and counts to the mode that senior number improves heat-up rate gradually and heat temperature raising; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing.
4, the refining of LF stove finishes back maintenance bottom soft blow Ar, by predetermined add-on feeding rare-earth wires.
5, carry out VD vacuum-treat: vacuum tightness≤0.10KPa, dark vacuum time 〉=13 minutes.
6, feeding fixed length silico-calcium silk carries out blowing in 8-10 minute Ar behind hello the silk; To carry out billet continuous casting through the molten steel after the VD vacuum-treat, adopt constant speed control and the induction stirring technology of low pulling rate; The control molten steel overheat; Strand carries out flame cutting after aligning.
Strand is carried out the chemical ingredients chemical examination, and the chemical ingredients of strand should meet following requirement (weight percent %): C0.07-0.12; Si0.10-0.30; Mn1.10-1.40; P≤0.015; S≤0.005; Cr0.10-0.30; Ni0.90-1.20; V0.05-0.20; Ti0.01-0.03; Al0.01-0.04; Rare earth elements RE 0.0005-0.010; Cu＜0.10; Surplus is matrix Fe and the micro impurity element that can't detect.
Described rare earth elements RE is the norium of Ce, La, and their weight percent is respectively: Ce67%, La33%.
Add rare earth element and can play effects such as improving non-metallic inclusion form, reinforcement crystal boundary and crystal grain thinning, thereby obtain refined crystalline strengthening and the effect that improves impelling strength.
Composition is chemically examined the continuously cast bloom that qualified and sufur printing is not more than 2.0 grades be rolled, the operation of rolling is as follows:
Continuously cast bloom is put into walking beam furnace heat, continuous review and the temperature of each sections such as process furnace preheating section, heating zone, soaking zone controlled well, the temperature and time control of each section sees Table 1;
The control of each section of table 1 walking beam furnace temperature and time
Each section of process furnace temperature is controlled automatically and automatic record with microcomputer.
Hot tool must be measured before use, must check before rolling, handle roller-way, avoids scratching stocking.
The continuously cast bloom that heats successively is rolled into the H shaped steel of the required specification of user at BD1, BD2, CCS unit, finishing temperature is controlled between 830～890 ℃, to reach the effect of rolling normalizing; Every batch is carried out once heat sampling at least when rolling, checks geometrical dimension; Qualified H shaped steel is with temperature correction straight, straightening temperature 〉=500 ℃.
Then H shaped steel is pursued the Zhi Jinhang carrying out flaw detection.
Through above-mentioned technological process, can produce " have low-temperature flexibility contain rare earth H shaped steel " of the present invention.
The beneficial effect of the invention:
1. owing to replace normalizing process with the control finishing temperature, so production cost is lower;
2. owing to be with temperature correction straight more than 500 ℃, so unrelieved stress is also lower;
3. because the unique component of rare earth element " contain design ", makes every excellent performance of H shaped steel in conjunction with ripe production technique, the specific performance index is as follows:
Yield strength: 460～530MPa; Tensile strength: 630～720MPa; Yield tensile ratio :≤0.80; Unit elongation: 〉=26%; Traverse impact value: a
KV〉=100J/cm
2(80 ℃).
The present invention is directed to the problem that exists in the background technology, by technical measures such as " unique chemical compositions design and be the unique production technique of raw material with blast-melted ", solved the problems referred to above well, obtained obvious improvement.
Four, embodiment:
Be described in further detail below in conjunction with the present invention of embodiment.
Embodiment 1:
Raw material is by weight percentage: blast-melted 90%, and high-quality steel scrap 10%.
Technological process of production summary is: roll among hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → billet continuous casting → cutting → strand heating → dephosphorize by high pressure water → BD1 cogging → BD2 → dephosphorize by high pressure water → CCS universal rolling → aligning → cooling → sawing → flaw detection.
The concrete technological process of production is as described below:
90 tons of blast-melted usefulness " metal magnesium powder " are done the desulfating and deoxidation pre-treatment, make the S amount that contains in the molten iron be reduced to (weight percent) below 0.010%;
Described 90 tons of preprocessed molten irons are blended in 100 tonnes the top and bottom combined blown converter, add 10 tons of high-quality steel scraps again, adopt single slag technology to smelt then, finishing slag basicity is by 3.0 controls, adopt silicomanganese, ferromanganese and ferrochrome to carry out deoxidation alloying during tapping, final deoxygenation adopts aluminium deoxidation technology, the necessary pushing off the slag of tapping process, the pushing off the slag failure must be skimmed, and adds 200kg lime piece after the tapping process interalloy adds.
Enter furnaceman LF position and carry out refining smelting the good molten steel ladle of packing into: normal Argon on request during refining, adopt from rudimentary and count to the mode heat temperature raising that senior number improves heat-up rate gradually; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing, and nickel plate, vanadium iron and ferro-titanium added in the middle and later periods;
After finishing, the refining of LF stove to keep bottom soft blow Ar, by the rare-earth wires of predetermined add-on feeding certain-length.
Then the good molten steel of refining is carried out the VD vacuum-treat: dark vacuum tightness≤0.10KPa, dark vacuum time 〉=13 minutes; Feed the silicon-calcium wire of certain-length again, feed the silk back and keep 8～10 minutes soft blow Ar.
Will be through the molten steel after the VD vacuum-treat big bag hang on ladle turret and carry out 5 machines, 5 stream billet continuous castings, adopt constant speed control and the induction stirring technology of low pulling rate during continuous casting; Molten steel overheat Δ T≤30 ℃; Strand is aligned after going out the secondary cooling zone territory, uses flame cutting then.
To strand samplingization, check, its chemical ingredients result of laboratory test (weight percent content) is as follows:
C0.09; Si0.21; Mn1.23; P0.013; S0.003; Cr0.23; Ni1.07; V0.10; Ti0.017; Al0.029; Rare earth elements RE 0.0013; Cu＜0.007; Surplus is matrix Fe and the micro impurity element that can't detect; Described rare earth elements RE is: the norium that the La of 67% Ce+33% constitutes, its chemical ingredients and content thereof are qualified.
Sufur printing: all be no more than 1.0 grades, macroscopic examination is qualified.
The strand of changing, being up to the standards is rolled, and the operation of rolling is as follows:
In order to make strand have good rolling performance, continuous detecting and control preheating section, the heating zone of process furnace, the temperature and time of soaking zone, guarantee that heating is thoroughly evenly and not overheated.
Each section of process furnace temperature is controlled automatically and automatic record with microcomputer.
Hot tool must be measured before use, must check before rolling, handle roller-way, avoids scratching stocking.
The strand that heats should carry out high-pressure water descaling before rolling, to remove the iron scale of casting billet surface.
Strand successively at BD1, that the BD2 milling train carries out multi-pass is rolling.
Adopt high pressure water to remove the secondary oxidation iron sheet of steel piece surface, becoming specification at the CCS universal rolling is the H shaped steel of H400mm * 200mm, and finishing temperature is between 850～880 ℃, to reach the effect of rolling normalizing; Every batch is carried out once heat sampling when rolling, checks geometrical dimension; Qualified H shaped steel is with temperature correction straight, and straightening temperature is 511 ℃.
Also carry out nondestructiving inspecting test through above-mentioned explained hereafter, the finished product that eligible namely becomes is of the present invention " have low-temperature flexibility contain rare earth H shaped steel " is produced sample with it and is carried out mechanical property, metallographic structure check.
Through check, mechanical property, the metallographic structure detected result of the embodiment 1 H shaped steel that produces see Table 2.
The mechanical property of table 2 H shaped steel, metallographic structure detected result
| R el(MPa) | R m(MPa) | R el/R m | A(％) | a KV(laterally ,-80 ℃, J/cm 2) | Tissue |
| 495 | 672 | 0.74 | 28.0 | 133 | Ferrite+perlite |
Embodiment 2:
The proportioning raw materials of embodiment 2, the technological process of production etc. and other technic indexs are all identical with embodiment 1, and difference is the chemical composition content (weight %) of its strand, specifically sees Table 3, and the mechanical property of H shaped steel, metallographic structure detected result see Table 4.
The chemical ingredients detected result (weight %) of table 3 strand
The mechanical property of table 4 H shaped steel, metallographic structure detected result
| R el(MPa) | R m(MPa) | R el/R m | A(％) | a KV(laterally ,-80 ℃, J/cm 2) | Tissue |
| 505 | 687 | 0.74 | 27.5 | 125 | Ferrite+perlite |
Claims (10)
- One kind have a low-temperature flexibility contain rare earth H shaped steel, it is characterized in that raw material is that 90% high-quality steel scrap blast-melted and 10% is formed by weight percent, its chemical ingredients is respectively by weight percentage: C0.07-0.12; Si0.10-0.30; Mn1.10-1.40; P≤0.015; S≤0.005; Cr0.10-0.30; Ni0.90-1.20; V0.05-0.20; Ti0.01-0.03; Al0.01-0.04; Rare earth elements RE 0.0005-0.010; Cu＜0.10; Surplus is matrix Fe and the micro impurity element that can't detect; The mechanical property of product: yield strength 460～530MPa, the traverse impact value a-80 ℃ the time KV〉=100J/cm 2
- According to claim 1 a kind of have a low-temperature flexibility contain rare earth H shaped steel, it is characterized in that RE is the norium of Ce and La, its weight percent is: Ce67%, La33%.
- One kind according to claim 1 feature have a low-temperature flexibility contain rare earth H shape steel producing method, it is characterized in that technological process of production summary is: roll among hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → billet continuous casting → cutting → strand heating → dephosphorize by high pressure water → BD1 cogging → BD2 → dephosphorize by high pressure water → CCS universal mill is rolling → aligning → cooling → sawing → flaw detection.
- According to claim 3 a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, it is characterized in that blast-melted through pre-treatment, make that S content is reduced to weight percent below 0.010% in the molten iron; Pretreated molten iron and high-quality steel scrap are added top and bottom combined blown converter by design proportion respectively, adopt single slag technology to smelt, control finishing slag basicity and terminal point target; Carry out deoxidation alloying in the tapping process, final deoxygenation adopts aluminium deoxidation technology, and tapping process must pushing off the slag or skimmed adding lime piece after the tapping process interalloy adds.
- According to claim 3 a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, it is characterized in that carrying out refining at the LF stove, the refining whole process is normal Argon on request, adopts from rudimentary and counts to the mode heat temperature raising that senior number improves heat-up rate gradually; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing.
- According to claim 3 or 5 described a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, it is characterized in that the refining of LF stove finishes the back and keeps bottom soft blow Ar, by predetermined add-on feeding rare-earth wires.
- According to claim 3 a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, it is characterized in that carrying out the vacuum treated vacuum tightness≤0.10KPa of VD, dark vacuum time 〉=13 minutes.
- According to claim 3 or 7 described a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, feeding fixed length silico-calcium silk when it is characterized in that the VD vacuum-treat carries out blowing in 8～10 minutes Ar after feeding silk.
- According to claim 3 a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, when it is characterized in that carrying out billet continuous casting, adopt constant speed control and the induction stirring technology of low pulling rate and control molten steel overheat≤30 ℃; Strand is aligned after going out the secondary cooling zone territory, then cutting.
- According to claim 3 a kind of have a low-temperature flexibility contain rare earth H shape steel producing method, it is characterized in that finishing temperature control is between 830～890 ℃, to reach the effect of rolling normalizing; It is straight to carry out the band temperature correction, straightening temperature 〉=500 ℃.
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| CN104561730A (en) * | 2014-12-22 | 2015-04-29 | 天津钢铁集团有限公司 | Method for producing GCr15 bearing steel billets |
| CN104789857A (en) * | 2015-04-13 | 2015-07-22 | 内蒙古包钢钢联股份有限公司 | Low-cost 235 MPa grade low-temperature hot-rolling H section steel and preparation method thereof |
| CN104805354A (en) * | 2015-04-30 | 2015-07-29 | 内蒙古包钢钢联股份有限公司 | Boracic deep low temperature hot rolling H-section steel and preparation method thereof |
| CN107557665A (en) * | 2017-08-30 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of yield strength 345MPa levels rare earth Weather-resistance bridge steel plate and its production method |
| CN107829031A (en) * | 2017-11-21 | 2018-03-23 | 安徽金阳金属结构工程有限公司 | A kind of big cross section H profile steel and its production technology |
| CN109055855A (en) * | 2018-08-01 | 2018-12-21 | 包头钢铁（集团）有限责任公司 | A kind of H profile steel and its production method of high-strength low temperature resistant atmospheric corrosion resistance |
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| CN109402506A (en) * | 2018-11-07 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | A kind of gas cylinder 34Mn containing rare earth2VRE rolls square billet and its manufacturing method |
| CN110499468A (en) * | 2019-09-22 | 2019-11-26 | 江苏方圆型钢有限公司 | A kind of high-yield strength hot-rolled steel section and its production technology |
| CN112593152A (en) * | 2020-11-26 | 2021-04-02 | 安徽金阳金属结构工程有限公司 | High-strength H-shaped steel for fabricated building and production process thereof |
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| CN104561730A (en) * | 2014-12-22 | 2015-04-29 | 天津钢铁集团有限公司 | Method for producing GCr15 bearing steel billets |
| CN104561730B (en) * | 2014-12-22 | 2016-09-07 | 天津钢铁集团有限公司 | A kind of production method of GCr15 Bearing Steel Billet |
| CN104789857A (en) * | 2015-04-13 | 2015-07-22 | 内蒙古包钢钢联股份有限公司 | Low-cost 235 MPa grade low-temperature hot-rolling H section steel and preparation method thereof |
| CN104805354A (en) * | 2015-04-30 | 2015-07-29 | 内蒙古包钢钢联股份有限公司 | Boracic deep low temperature hot rolling H-section steel and preparation method thereof |
| CN107557665A (en) * | 2017-08-30 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of yield strength 345MPa levels rare earth Weather-resistance bridge steel plate and its production method |
| CN107829031A (en) * | 2017-11-21 | 2018-03-23 | 安徽金阳金属结构工程有限公司 | A kind of big cross section H profile steel and its production technology |
| CN109055855A (en) * | 2018-08-01 | 2018-12-21 | 包头钢铁（集团）有限责任公司 | A kind of H profile steel and its production method of high-strength low temperature resistant atmospheric corrosion resistance |
| CN109402506A (en) * | 2018-11-07 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | A kind of gas cylinder 34Mn containing rare earth2VRE rolls square billet and its manufacturing method |
| CN109338220A (en) * | 2018-11-07 | 2019-02-15 | 包头钢铁（集团）有限责任公司 | A kind of gas cylinder the rolling square billet of 37MnRE containing rare earth and its manufacturing method |
| CN109338220B (en) * | 2018-11-07 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Rare earth-containing 37MnRE rolling square billet for gas cylinder and manufacturing method thereof |
| CN110499468A (en) * | 2019-09-22 | 2019-11-26 | 江苏方圆型钢有限公司 | A kind of high-yield strength hot-rolled steel section and its production technology |
| CN112593152A (en) * | 2020-11-26 | 2021-04-02 | 安徽金阳金属结构工程有限公司 | High-strength H-shaped steel for fabricated building and production process thereof |
| CN113502435A (en) * | 2021-06-30 | 2021-10-15 | 本钢板材股份有限公司 | Oil casing pipe steel for improving low-temperature impact toughness and preparation method thereof |
| CN116334363A (en) * | 2023-03-14 | 2023-06-27 | 包头钢铁（集团）有限责任公司 | Method for improving fatigue performance of weathering steel |
| CN117144081A (en) * | 2023-10-30 | 2023-12-01 | 金鼎重工有限公司 | Rolling method of hot rolled H-shaped steel for Nb-containing low temperature resistant structure |
| CN117144081B (en) * | 2023-10-30 | 2024-01-16 | 金鼎重工有限公司 | Rolling method of hot rolled H-shaped steel for Nb-containing low temperature resistant structure |
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Application publication date: 20130904 |