CN105200337A - High-strength abrasion-resisting steel plate and production method thereof - Google Patents
High-strength abrasion-resisting steel plate and production method thereof Download PDFInfo
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Abstract
The invention provides a high-strength abrasion-resisting steel plate and a production method thereof. The chemical components of the high-strength abrasion-resisting steel plate include, by weight, 0.25-0.30% of C, 0.3-0.5% of Si, 0.40-1.00% of Mn, 0.6-1.2% of Cr, 0.15-0.4% of Mo, 0.01-0.03% of Nb, smaller than or equal to 0.50% of Ni, smaller than or equal to 0.50% of Cu, 0.0005-0.0022% of B, 0.025-0.04% of Ti, 0.020-0.045% of Als, smaller than or equal to 0.015% of P and smaller than or equal to 0.005% of S, wherein Ti/N is greater than or equal to 3.4. During refining, molten steel [N] is controlled to be smaller than or equal to 0.0080%, [O] is controlled to be smaller than or equal to 0.0020%, it is ensured that the effective boron content is 0.0010-0.0020%, and stacking for slow-cooling is performed for 48 hours or more after continuous casting. Two-stage rolling control is adopted, the finish rolling temperature at the first stage is 980-1050 DEG C, out-line quenching is conducted on plate blanks with the thickness greater than 50 mm at the second stage, swinging is performed at the low-pressure section of a quenching machine, on-line quenching is conducted on plate blanks with the thickness smaller than or equal to 50 mm, and residual heat is utilized to perform self tempering. The high-strength abrasion-resisting steel plate has lower carbon and manganese contents and good weldability, the surface hardness is greater than 550 HB, and the toughness at the low temperature of -40 DEG C is greater than 30 J, and the maximum thickness can be up to 120 mm.
Description
Technical field
The invention belongs to metallic substance field of metallurgy, particularly a kind of 550HB grade high-strength wear-resisting steel plate and production method thereof.
Background technology
Wear-resisting steel plate can be widely used in the fields such as the energy, traffic, agricultural machinery, mining equiment, engineering machinery and cement equipment, and high-carbon height manganese series was once widely used over one hundred year as classical wear resisting steel.But when the impact that broken material is subject to is not strong, the work hardening ability had due to high mangaenese steel can not fully be played, high manganese steel lining plate is made to show quick abrasion, work-ing life short weakness; And low, interalloy wear resisting steel is owing to having good wear resistance and toughness, production technique is comparatively simple, and the rational feature of economy, development & application develops very fast.
The wear-resisting steel plate of surface hardness 550HB rank is high-strength abrasion-proof steel plate, has higher surface hardness and wear resistance, general adopt quenching to add low-temperaturetempering state under supply, use under the operating mode mainly needing high abrasion at engineering machinery, mining machinery etc.
The production of domestic and international high-strength abrasion-proof steel plate has formed multinomial patent, such as China Patent Publication No. is that CN1775983 provides one " high-strength casted air-colled bainite wear-resisting steel and preparation method thereof ", its chemical composition is (% by weight): C0.32 ~ 0.65, Si0.8 ~ 3.0, Mn1.2 ~ 3.0, Cr0.5 ~ 0.8, Cu0.3 ~ 0.8, B0.001 ~ 0.008, Al0.18 ~ 0.35, Y0.05 ~ 0.15, Ti0.05 ~ 0.20, Mg0 ~ 0.12, Ca0 ~ 0.12, Zn0 ~ 0.15, and 0.10 < Mg+Ca+Zn < 0.25, all the other are Fe and inevitable trace impurity.Its manufacturing process is: steel scrap, the pig iron, ferrochrome and copper coin Hybrid Heating are melted, and adds ferrosilicon and ferromanganese pre-deoxidation and alloying after melting down; After stokehold adjusting component is qualified, temperature is risen to 1600 ~ 1660 DEG C, add aluminium final deoxygenation and alloying, then come out of the stove; By the fritter being crushed to granularity containing the compound modifier of yttrium, boron, titanium, magnesium, calcium and zinc etc. and being less than 25mm, being placed in bottom casting ladle, carrying out compound modification treatment with pouring method in bag to molten steel; After Metamorphism treatment, molten steel is poured into foundry goods in common casting mold.Wear resisting steel carbon and manganese content compared with traditional high mangaenese steel of this invention obviously reduces, and surface hardness improves, and Rockwell hardness is 55.7, because surface hardness improves, can work-ing life be significantly improved, improve equipment work efficiency, reduce production cost, there is good economic benefit.Carbon, high-silicon alloy wear resisting steel during this patent belongs to, alloy system is complicated, and aluminium, silicon, titanium content are higher, and smelting, continuous casting difficulty, can only for the production of foundry goods.
Patent publication No. CN1140205 disclosed " in one carbon interalloy wear resisting steel ", its chemical composition is: C0.45 ~ 0.65%, Si0.3 ~ 0.8%, Mn0.4 ~ 1.0%, Cr4.0 ~ 5.5%, Mo0.3 ~ 0.7%, V0.2 ~ 0.5%, Re0.02 ~ 0.05%, PS≤0.040%.This patent adopts the method for cast steel to produce, liner plate, the bin isolation board of the medium-sized ball mill compared with high load working condition condition are born in applicable making, roll-type crushing roller, hammer, the tup of impact breaker, bar, also can be used for the tooth plate to the strict jaw crusher of magnetic separation requirement, work-ing life is 3-4 times of high mangaenese steel.The patented product manganese, silicone content are lower, but the alloy content such as carbon and chrome molybdenum is still higher, can only Foundry Production, and smelt difficulty containing rare earth steel, and production process is wayward.This patent wear resisting steel surface hardness is Rockwell 52, and lower hardness, wear resistance is poor.
Patent publication No. CN101250673 provides " a kind of ultrahigh-strength wear-resistant steel and production method thereof ", its composition is (weight percent): C0.10 ~ 0.17%, Si0.25 ~ 0.50%, Mn1.20 ~ 1.50%, P≤0.018%, S≤0.008%, Cr0.20 ~ 0.50%, Ni0.25 ~ 0.50%, Mo0.10 ~ 0.40%, Als0.02 ~ 0.06%, B≤0.005%, RE≤150g/ ton steel, surplus is Fe and inevitable impurity, and carbon equivalent Ceq (%)≤0.60, Ceq (%)=C+Mn/6+ (Mo+Cr+V)/5+ (Ni+Cu)/15.The concrete production method of this steel comprises: and ultra-clean steel technique carries out smelting-and desulfurizing iron-converter top bottom blowing-vacuum-treat-crystallizer feeds rare earth (RE) silk-pour into setting-out cooling-steel plate modifier treatment in slab-heating of plate blank-roughing-finish rolling-air cooling or punching.This patent carbon and alloy content lower, can produce by continuous casting, though be superstrength and high tenacity, but steel plate hardness is only 400HB can not reach 550HB, working conditions can not be widely used in severe, require on high mine and construction machinery product to wear resisting property, and need temper after quenching, complex process, cost is high.
Baoshan Iron & Steel Co., Ltd Li Hong is refined, Yao Liandeng, Liu Zicheng, the publication number of people's applications such as Zhao little Ting is " a kind of wear-resisting steel plate " of CN10234682A, steel plate composition by weight percent is: C:0.31 ~ 0.40%, Si:0.10 ~ 0.80%, Mn:0.20 ~ 1.50%, P :≤0.050%, S :≤0.030%, Cr:0 ~ 1.50%, Mo:0 ~ 0.80%, Al:0.02 ~ 0.20%, B:0.0005 ~ 0.0040%, Ti:0 ~ 0.10%, Ca:0 ~ 0.030%, 0.10%≤Cr+Mo≤1.80%, 0.05%≤Al+Ti≤0.18%, surplus is Fe and inevitable impurity.The manufacture method of this wear-resisting steel plate, comprises the steps such as smelting, refining, casting, rolling, Quench and temper.The 550HB grade wear-resisting steel plate hardness high (>=550HB) obtained by above composition and technique, can be welded and bend, and microtexture is martensite or martensite and residual austenite.This steel wear resisting property is excellent, is highly suitable in strong abrasion environment and works, especially on the vehicle contacted with the high rigidity material such as high strength ore or facility, as scraper bowl, shovel loader and mine electric wheel dump etc.This patent more than surface of steel plate Brinell hardness 550HB, maximum ga(u)ge is 60mm, and the thermal treatment process adopting quenching to add low-temperaturetempering is produced, this patent carbon content is higher 0.31 ~ 0.4%, crackle tendency is large, and can not produce 60mm with upper steel plate, is not suitable for the requirement of mine heavy thickness abrasion-proof backing block; Need tempering, complex process after the quenching of this patent, cost is high.
U.S. Patent Publication No. is patent of invention " manufacture method of wear-resisting steel plate and the part " (ABRASIONRESISTANTSTEEL of US2012134872 (A1), METHODOFMANUFACTURINGANABRASIONRESISTANTSTEELANDARTICLES MADETHEREFROM), its composition content represents with weight: 0.20-0.30%C, 0.40-1.25%Mn, ≤ 0.05%P, ≤ 0.01%S, 0.20-0.60%Si, 0.50-1.70%Cr, 0.20-2.00%Ni, 0.07-0.60%Mo, 0.010-0.10%Ti, 0.001-0.10%B, 0.015-0.10%Al, production method is that hot rolling post-heating is to 1650-1700 °F., hardening, at tempering temperature 350-450 °F., steel plate surface hardness is greater than 440HBW, and centre hardness is greater than 90% of surface hardness, and steel plate transverse impact is at 60 °F. be greater than 20ft-lbs, room temperature >=40ft-lbs.This patent carbon and alloy content lower, low-temperature flexibility is good, but surface hardness is only 440HB, maximum ga(u)ge 20mm, and needs off-line temper, and complex process cost is high.
U.S. Patent Publication No. is patent of invention " a kind of wear-resisting steel plate and manufacture method thereof " (the METHODFORMAKINGANABRASION-RESISTANTSTEELPLATEANDPIATEOBT AINED) of US2008/0247903Al, its composition wt% is: 0.35%≤C≤0.8%, 0%≤Si≤2%, 0%≤Al≤2%, 0.35%≤Si+AL≤2%, 0%≤Mn≤2.5%, 0%≤Ni≤5%, 0%≤Cr≤5%, 0%≤Mo≤0.50%, 0%≤W≤1.0%, 0.1%≤Mo+W/2≤0.50%, 0%≤B≤0.02%, 0%≤W≤2%, 0%≤Zr≤4%, 0.05%≤Ti+Zr/2≤2%, 0%≤S≤0.15%, N≤0.03%, more than AC3 to be greater than the cooling rate cool to room temperature of 5 DEG C/s, steel plate thickness 2 ~ 150mm, surface of steel plate roughness 5 ~ 12mm/m, 250 ~ 350 DEG C of tempering, the steel plate hardness 280 ~ 650HB of acquisition.This patent hardness span is large, and have 3 routine hardness to be greater than 550HB in embodiment, but carbon content is 0.59 ~ 0.69%, still belong to high carbon steel scope, weldability is poor, and crackle tendency is large, and this proprietary alloy content is many, and system is complicated, and need off-line tempering heat treatment, cost is higher.
In sum, the production of current 550HB grade high-strength degree wear-resisting steel plate has the following disadvantages:
1, the alloy content such as carbon and manganese silicon is higher, smelts difficulty, can only produce foundry goods;
2, surface hardness is lower than 550HB, and thickness is lower than 60mm;
3, complex manufacturing, needs after quenching to carry out tempering heat treatment.
Summary of the invention
Object of the present invention aims to provide a kind of steel plate thickness 8 ~ 120mm, and surface hardness is greater than 550HB ,-40 DEG C of low-temperature flexibilities are greater than 30J, carbon and Fe content lower, and do not need high-strength abrasion-proof steel plate and the production method thereof of tempering.
For this reason, the solution that the present invention takes is:
A kind of high-strength abrasion-proof steel plate, its chemical composition wt% is: C:0.25% ~ 0.30%, Si:0.3% ~ 0.5%, Mn:0.40% ~ 1.00%, Cr:0.6% ~ 1.2%, Mo:0.15% ~ 0.4%, Nb:0.01% ~ 0.03%, Ni≤0.50%, Cu≤0.50%, B:0.0005% ~ 0.0022%, Ti:0.025% ~ 0.04%, Als:0.020% ~ 0.045%, surplus is Fe and inevitable impurity; Impurity element in steel controls: P≤0.015%, S≤0.005%, [N]≤0.0080%, [O]≤0.0020%, and Ti/N >=3.4.
C: in order to hardening capacity when ensureing surface hardness and the Plate Steel water-cooled of steel plate superelevation needs suitable carbon content to ensure, the hardness of steel increases accordingly with the increase of carbon content within the specific limits, simultaneously certain carbon content can form Carbide Precipitation with Nb, Ti, Cr, Mo etc., increases wear resistance.Carbon content too high then plasticity toughness reduces welding property and declines, and in order to ensure the high rigidity of steel plate and welding property and low-temperature flexibility, therefore in the present invention, C content controls 0.25 ~ 0.30%.
Si: Main Function is solution strengthening and deoxidation, is non-carbide forming element, can suppresses the precipitation of carbide when Si content is more, but welding property can be made to decline time too much, and affect toughness, therefore in the present invention, Si content controls 0.3 ~ 0.5% simultaneously.
Mn: Main Function is solution strengthening, can improve hardening capacity when content is greater than 0.4%, improves the degree of supersaturation of carbon in martensite, be conducive to the raising of intensity and hardness, and with low cost, but content higher than 1.0 time easily form center segregation, slab can be made to have the tendency of easy micro-flaw; Therefore in the present invention, Mn content controls 0.4% ~ 1.0%.
Nb: be strong carbon and nitrogen compound forming element, Main Function be by formed in steel tiny carbonitride suppress heating time grain growth, there is again during air cooling the effect of certain precipitation strength; Nb adds in steel, by suppressing austenite crystal Interface Motion, thus improves the recrystallization temperature of steel plate.Add appropriate Nb in steel plate, during influence of high austenizing temp, undissolved NbC plays the effect of anchoring austenite grain boundary, thus hinders the undue alligatoring of austenite grain boundary.Be dissolved in the Nb in austenite, in two-phase control rolling process, suppress austenite recrystallization, fining austenite grains.But Nb too high levels, then can form thick NbC, affects the mechanical property of steel plate.Therefore, in the present invention, the add-on of Nb is 0.0l ~ 0.03%.
Ti: can with nitrogen, carbon and sulphur form compound, Main Function be by formed in steel tiny carbonitride suppress heating time grain growth, titanium and nitrogen compound formation temperature higher, the Precipitation Temperature of vanadium carbide and niobium carbide comparatively titanium carbide and titanium nitride low, the ratio (Ti/N >=3.4) controlling titanium nitrogen is passed through when adding titanium, make the main carburet of niobium, free N and the B in steel can be stoped to form compound simultaneously, improve acid-soluble boron recovery rate and give full play to the effect that B improves hardening capacity, but thick TiN can be formed during too high levels, reduce low-temperature flexibility and the fatigue property of steel plate, therefore in the present invention, the add-on of Ti controls 0.025% ~ 0.04% and Ti/N >=3.4.
Mo, Cr: Main Function reduces critical cooling velocity, improve the hardening capacity of steel plate, form completely tiny martensitic stucture, chromium, molybdenum can form multiple carbide in steel in addition, improve intensity and the hardness of steel plate, ensure that the hardness of thick steel plates is at more than 550HB, Mo content is greater than 0.15%, successful when Cr content is greater than 0.6%, Mo, Cr content increases with thickness and suitably increases, but Mo is expensive, and Mo, Cr too much add, weldability also can be made to reduce, therefore the present invention's control Cr:0.6 ~ 1.2%, Mo:0.15 ~ 0.4%.
B: the boron adding trace in steel can greatly improve quenching hardening capacity, because the add-on of boron is very little, and has stronger avidity with oxygen, nitrogen in molten steel, is easy to and its generation combination reaction, thus lose the effect improving hardening capacity.The content of steel water oxygen and nitrogen should be reduced before adding boron when therefore smelting as far as possible, but (>=0.0025%) is easily in grain boundaries enrichment when B content is too much, reducing crystal boundary and combine energy, making steel plate be more prone to grain boundary fracture when being subject to shock load, the low-temperature impact reducing steel plate absorbs merit.Therefore, in the present invention, the add-on of B is 0.0005 ~ 0.0022%, and [N]≤0.0080%, [O]≤0.0020%.
Cu, Ni: be greater than interpolation 0.3 ~ 0.5%Cu in 50mm Plate Steel, self-tempering process after quenching can form ε-Cu and separate out, the intensity of effective raising steel and hardness, but in heating and course of hot rolling, easily cause edge burning and surface to stick up the surface quality defects such as skin because of copper brittleness containing Cu steel.For improving the surface quality containing Cu steel, in Chang Xianggang, adding dystectic Ni element, to form dystectic Cu, Ni binary alloy phase, reducing the rich Cu phase of low melting point, increasing the solubleness of Cu in steel simultaneously.For reaching the object suppressed completely containing Cu steel copper brittleness defect, generally Ni:Cu ratio is controlled be greater than 1:2, Ni improves to be greater than the hardness of 50mm thick steel plates and the element of low-temperature flexibility simultaneously, Ni can form FeNi compound with Fe, when steel plate is subject to low-temperature impact load at a lower temperature, the Ni of solid solution can improve the low-temperature impact absorption merit of steel plate, but Ni cost is higher, therefore in the present invention, thick steel plates adds mechanical property especially-40 DEG C of low-temperature flexibilities that the Ni being less than or equal to 0.5% can ensure steel plate, and makes it have the market competitiveness.
A production method for high-strength abrasion-proof steel plate, its technological process of production: hot metal pretreatment-converter smelting-refining-vacuum outgas-micro-Ti process-B alloying-continuous casting-stacking slow cooling-band temperature cleaning-heating of plate blank-rolling-press quenching (finished steel plate thickness≤50mm)-aligning-stacking-out-line quenching (finished steel plate thickness G reatT.GreaT.GT 50mm).Concrete grammar is:
Smelt and continuous casting process:
Carry out hot metal pretreatment, adopt converter smelting, by top blast or top bottom blowing, carry out refining treatment, and carry out microalloying, control Impurities in steel and and carry out the control of effective B.During refining, control molten steel [N]≤0.0080%, [O]≤0.0020%, add Ti microalloying, control Ti/N >=3.5 in steel, to ensure that the content of effective boron in steel is 0.0010% ~ 0.0020% simultaneously, continuous casting adopts induction stirring, reduces element segregation; Stacking slow cooling >=48h after continuous casting, effectively removes the hydrogen richness in steel billet and casting internal stress; Then carry out the cleaning of slab band temperature, reduce casting flaw, during cleaning, board briquette controls at 100 ~ 200 DEG C, to avoid the generation of cutting crackle.
Rolling and thermal treatment process:
Billet heating temperature 1200 ~ 1250 DEG C;
Two benches controlled rolling is adopted during rolling, in the first stage operation of rolling, the process of austenite occurrence dynamics recrystallize, Static Recrystallization and dynamic recovery, refinement austenite crystal; The further refinement of subordinate phase austenite and be enriched a large amount of dislocations, for press quenching or phase transformation provide a large amount of nucleation sites.
First stage roughing start rolling temperature is 1050 ~ 1100 DEG C, finishing temperature 980 ~ 1050 DEG C.
Subordinate phase finish rolling takes different rolling technologys according to finished steel plate thickness difference: for the slab two-stage start rolling temperature < 870 DEG C of finished steel plate thickness G reatT.GreaT.GT 50mm, finishing temperature≤860 DEG C, roll rear air cooling; Out-line quenching is carried out, quenching temperature 850 ~ 900 DEG C, insulation 2 ~ 3min/mm after cooling; During quenching, swing, time of oscillation 100 ~ 200s at continuous quenching machine low-pressure stage, quenching final cooling temperature 150 ~ 250 DEG C, then stacking air cooling is to room temperature, time >=24h;
Slab start rolling temperature for finished steel plate thickness≤50mm controls at≤930 DEG C, finishing temperature control is < 850 DEG C, carry out press quenching after rolling, enter water temp 790 ~ 850 DEG C, speed of cooling >=10 DEG C/S, red temperature is 200 ~ 250 DEG C, immediately roll off the production line after rolling stacking or enter groove slow cooling, utilizes remaining temperature to carry out self-tempering, time >=24h, both can effectively avoid steel plate quenching to ftracture, additionally reduce tempering heat treatment operation.
Beneficial effect of the present invention is:
1, lower carbon and Fe content; Carbon content is less than 0.30%, and alloying constituent is simple, and weldability is good, and crackle tendency is low.
2, surface hardness is greater than 550HB; Can use under the operating mode of the serious wear such as mining machinery.
3, finished steel plate maximum ga(u)ge can reach 120mm; The user demand compared with heavy thickness wear-resisting steel plate can be met.
4 ,-40 DEG C of low-temperature flexibilities are greater than 30J, and steel plate has good low temperature crack arrest ability, can use under-40 DEG C of low temperature environments.
Accompanying drawing explanation
Fig. 1 is 100mm Plate Steel section hardness distribution plan.
Embodiment
The technical process of the production method of high-strength abrasion-proof steel plate of the present invention is: hot metal pretreatment-converter smelting-refining-vacuum outgas-micro-Ti process-B alloying-continuous casting-stacking slow cooling-band temperature cleaning-heating of plate blank-rolling-press quenching (finished steel plate thickness≤50mm)-aligning-stacking-out-line quenching (finished steel plate thickness G reatT.GreaT.GT 50mm).
Below in conjunction with embodiment, the invention will be further described.
Embodiment chemical composition wt% is as shown in table 1; Embodiment rolling technological parameter is in table 2; Embodiment quenching heat treatment technique is in table 3; Embodiment service check result is as table 4; Fig. 1 is shown in the distribution of 100mm Plate Steel section hardness.
Table 1 embodiment chemical composition wt%
| Example | C | Si | Mn | Cr | Mo | Ni | Nb | Ti | B | Als | Cu | N | Ti/N |
| 1 | 0.26 | 0.4 | 1.0 | 0.60 | 0.15 | - | 0.03 | 0.04 | 0.0015 | 0.020 | - | 0.0035 | 11.4 |
| 2 | 0.27 | 0.3 | 0.8 | 0.80 | 0.20 | - | 0.02 | 0.025 | 0.0020 | 0.035 | - | 0.0040 | 6.3 |
| 3 | 0.28 | 0.4 | 0.6 | 1.00 | 0.30 | 0.40 | 0.018 | 0.036 | 0.0022 | 0.030 | 0.40 | 0.0045 | 8.0 |
| 4 | 0.30 | 0.5 | 0.4 | 1.20 | 0.40 | 0.50 | 0.024 | 0.033 | 0.0012 | 0.035 | 0.50 | 0.0060 | 5.5 |
During refining, control molten steel [N]≤0.0080%, [O]≤0.0020%, add Ti microalloying, control Ti/N >=3.5 in steel, to ensure that the content of effective boron in steel is 0.0010% ~ 0.0020% simultaneously, continuous casting adopts induction stirring, reduces element segregation; Stacking slow cooling >=48h after continuous casting, then carry out the cleaning of slab band temperature, during cleaning, board briquette controls at 100 ~ 200 DEG C.
Table 2 embodiment rolling technological parameter table
In table 2, embodiment 1-1,1-2 refer to two of embodiment 1 in table 1 different rolling technological parameter examples, remainingly all analogize.Table 3, table 4 are in like manner.
Table 3 embodiment quenching heat treatment process parameter table
Table 4 embodiment service check result
Claims (2)
1. a high-strength abrasion-proof steel plate, it is characterized in that, its chemical composition wt% is: C:0.25% ~ 0.30%, Si:0.3% ~ 0.5%, Mn:0.40% ~ 1.00%, Cr:0.6% ~ 1.2%, Mo:0.15% ~ 0.4%, Nb:0.01% ~ 0.03%, Ni≤0.50%, Cu≤0.50%, B:0.0005% ~ 0.0022%, Ti:0.025% ~ 0.04%, Als:0.020% ~ 0.045%, surplus is Fe and inevitable impurity; Impurity element in steel controls: P≤0.015%, S≤0.005%, [N]≤0.0080%, [O]≤0.0020%, and Ti/N >=3.4.
2. a production method for high-strength abrasion-proof steel plate as claimed in claim 1, is characterized in that, its concrete grammar is:
Smelt and continuous casting process:
During refining, control molten steel [N]≤0.0080%, [O]≤0.0020%, add Ti microalloying, control Ti/N >=3.5 in steel, to ensure that the content of effective boron in steel is 0.0010% ~ 0.0020% simultaneously, continuous casting adopts induction stirring, reduces element segregation; Stacking slow cooling >=48h after continuous casting, then carry out the cleaning of slab band temperature, during cleaning, board briquette controls at 100 ~ 200 DEG C;
Rolling and thermal treatment process:
Billet heating temperature 1200 ~ 1250 DEG C; Two benches controlled rolling is adopted: first stage roughing start rolling temperature is 1050 ~ 1100 DEG C, finishing temperature 980 ~ 1050 DEG C during rolling; Subordinate phase finish rolling takes different rolling technologys according to finished steel plate thickness difference: for the slab two-stage start rolling temperature < 870 DEG C of finished steel plate thickness G reatT.GreaT.GT 50mm, finishing temperature≤860 DEG C, roll rear air cooling; Out-line quenching is carried out, quenching temperature 850 ~ 900 DEG C, insulation 2 ~ 3min/mm after cooling; During quenching, swing, time of oscillation 100 ~ 200s at continuous quenching machine low-pressure stage, quenching final cooling temperature 150 ~ 250 DEG C, then stacking air cooling is to room temperature, time >=24h;
Slab start rolling temperature for finished steel plate thickness≤50mm controls at≤930 DEG C, finishing temperature control is < 850 DEG C, press quenching is carried out after rolling, enter water temp 790 ~ 850 DEG C, speed of cooling >=10 DEG C/S, red temperature is 200 ~ 250 DEG C, and immediately roll off the production line after rolling stacking or enter groove slow cooling, remaining temperature is utilized to carry out self-tempering, time >=24h.
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