CN102925806B - Y55 mark free-cutting steel plate and manufacture method thereof - Google Patents
Y55 mark free-cutting steel plate and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses a Y55 mark free-cutting steel plate and a manufacture method thereof. The steel plate comprises the following chemical components by weight percent: 0.50-0.58% of C, 0.05-0.15% of Si, 0.70-1.10% of Mn, less than or equal to 0.040% of P, 0.050-0.150% of S, 0.010-0.020% of Ti, 0.0015-0.0040% of Ca, and less than or equal to 0.015% of Alt. The manufacture method comprises the following steps that: desulfuration is not performed on molten iron in a converter, wherein the oxygen content is controlled at 30-70ppm; the temperature of a tundish is 1505-1525 DEG C, and the plate blank pull speed is 0.70-1.0m/min; the total heating time is controlled according to 0.95-10.5min/mm of the thickness of a casting blank; the initial blanking temperature is 1000-1050 DEG C, and the final rolling temperature is greater than or equal to 980 DEG C; and the steel plate is slowly cooled after hot rolling, wherein the slow cooling time is more than or equal to 48h. According to the invention, the steel plate is good in cutting performance, and the manufacture method is high in production efficiency.
Description
Technical field
The present invention relates to steel plate manufacturing technology field, particularly a kind of Y55 trade mark Cutting free steel plate and manufacture method thereof.
Background technology
Along with mechanical cutting processing is constantly to automatization, high speed and precise treatment future development, manufacturing concern's commute cutting steel plate proposes the requirement improving processing characteristics and more high strength, adds part work-ing life to reduce cutter loss and raising machine.China produces resulfurizing series free cutting steel from the 1950's, within 1975, has formulated the industry standard YB 191-75 of free-cutting steel.From the seventies, start to produce calcium system, titanium system and leaded, selenium, tellurium or rare earth free-cutting steel as a trial, current operative norm is GB/T 8731-2008, in standard, the resulfurizing series free cutting steel trade mark is named by the scope of carbon content in the Chinese phonetic alphabet first letter " Y " of " easily " word and steel, the highest trade mark of this standard is Y45(C 0.42 ~ 0.50%), the bar steel tensile strength of hot-rolled state is 560 ~ 800MPa, elongation after fracture A >=12%, Brinell hardness HBW≤229, for the performance of Cutting free steel plate, this standard does not propose specific requirement, is consulted by both sides of supply and demand.
At present, most domestic steel mill adopts the method for die casting or utilizes billet caster to produce Cutting free steel ingot (base), and die casting process energy consumption is high, recovery rate of iron is low, environmental pollution is large, is not suitable with current energy-saving and emission-reduction and the social orientation of environment protection.Free-cutting steel produced by billet caster, can only rolling rod wire.Because free-cutting steel sulphur content is high, control in sheet billet continuous casting process badly very easily to produce surface longitudinal crack, huge on the impact of strand qualification rate and production cost, be mainly manifested in: 1) surface crack is serious, causes strand to be scrapped or roll rear plate surface quality difference being judged to waster; 2) longitudinal crack that casting billet surface is serious very easily causes crackle bleed-out event to occur, damage equipment, and impact is produced; 3) the free-cutting steel carbon content of high strength is high, and slab must carry out hot delivery and hot charging, otherwise can natural fracture after slab cooling.Therefore, produce the report of sulphur free-cutting steel both at home and abroad there are no sheet billet continuous casting, be all rolling sulphur free-cutting steel plate after use die casting, the heavy demand of mechanical processing industry commute cutting steel plate cannot be met.
Summary of the invention
A kind of method that the invention provides high-strength simple-cutting steel plate and utilize continuous casting steel billet to manufacture, according to GB/T 8731-2008 standard resulfurizing series free cutting steel trade mark nomenclature, free-cutting steel trade mark called after Y55 of the present invention.
The present invention utilizes continuous casting steel billet to produce Y55 trade mark Cutting free steel plate, have employed the Composition Design of Mn-S-P-Ti-Ca system, ensureing the obdurability after the free cutting property of steel plate and steel plate processing by reasonably smelting continuous casting process, recrystallize rolling and steel plate slow cooling process.
A kind of Y55 trade mark Cutting free steel plate of the present invention, its chemical composition by mass percent is: C 0.50 ~ 0.58%, Si 0.05 ~ 0.15%, Mn 0.70 ~ 1.10%, P≤0.040%, S 0.050 ~ 0.150%, Ti 0.010 ~ 0.020%, Ca 0.0015 ~ 0.0040%, Alt≤0.015%, its surplus is iron Fe and inevitable impurity.
A manufacture method for Y55 trade mark Cutting free steel plate, by smelting+continuous casting+recrystallize rolling+steel plate retarded cooling process, it is characterized in that, its production technique is specific as follows:
1, converter smelting: converter molten iron does not carry out desulfurization, only decarburization and phosphorus, tap 1/4 time to add by silicomanganese-Si-Al-Ba-Fe-iron sulphide order and carry out weak deoxidation, Control for Oxygen Content is at 30 ~ 70ppm;
2, LF stove refining: add refining slag, submerged arc slag, adds iron sulphide and controls sulphur content, do not carry out white slag process, out-station temperature 1540 ~ 1550 DEG C;
3, continuous casting process: tundish temperature controls at 1505 ~ 1525 DEG C, slab casting speed control is at 0.70 ~ 1.0m/min, and secondary cooling water adopts weak cold, and nozzle mist is cold;
4, heating cycle: by hot delivering technology of CC billets, enters process furnace and is heated to 1200 ~ 1240 DEG C, and heating is pressed slab thickness 0.95 ~ 1.05min/mm total time and controlled;
5, rolling, process for cooling: adopt recrystallization zone rolling, start rolling temperature 1000 ~ 1050 DEG C, finishing temperature >=980 DEG C, roll rear air cooling;
6, retarded cooling process: after hot rolling, steel plate 720 ~ 760 DEG C enters insulation can slow cooling, slow cooling time >=48 hours.
Steel plate prepared by the inventive method, take full advantage of the sulfide inclusion of manganese sulfide inclusion and oxide parcel, this type impurity can interrupt the continuity of matrix metal, chip breaking is impelled to form little and short crimp radius when cutting, and be easy to get rid of, reduce machined surface roughness, reduce tool wear, improve cutter life; Meanwhile, phosphorus is solid-solution in ferrite can improve hardness and intensity, reduces toughness, makes chip be easy to fracture and get rid of, thus obtain good surfaceness; In steel, calcium is combined composite oxides (the mainly CaOAl forming low melting point with aluminium, silicon
2o
3siO
2), during high speed cutting, calcium system oxide compound is attached to cutting tool surface and plays lubrication and antifriction function, thus improves cutting-tool's used life.But the content of aluminium will control, deoxidation products Al
2o
3be a kind of hard particle, Cutter wear is serious, thus has a strong impact on the use properties of free-cutting steel.In major part steel grade, oxygen can reduce the mechanical property of steel, but controls oxygen level in free-cutting steel between 30 ~ 70ppm, makes sulfide be fusiform distribution, is conducive to the cutting ability improving steel.Keep the carbon content of 0.50 ~ 0.58% in steel, after ensure that steel plate processing, there is high strength.Add titanium in steel with deoxidation products Ti0
2form exist, formed Ti0
2-MnO – CaO-A1
20
2-Al
2o
3be complex inclusion, the tool setting when high speed cutting of this compound has good provide protection.
The invention has the advantages that:
1, resulfurizing series free cutting steel have employed the Composition Design of Mn-S-P-Ti-Ca system, takes full advantage of in strip, proeutectoid ferrite, perlite and discontinuous ferritic structure that the manganese sulfide of spindle-type and iron sulphide is mingled with, oxide and titanium nitride are mingled with parcel sulfide inclusion, austenite grain boundary are discontinuous netted precipitation.The inclusion morphology obtained, distribution improve the cutting ability of Y55 steel;
2, Y55 trade mark Cutting free steel plate produced by continuous casting steel billet, and surface-carburized layer is shallow, and oxide compound segregation is light, and flaw detection qualification rate is high, and lumber recovery is high.Low, with short production cycle by this Composition Design production cost, good processability;
3, utilize slab caster to produce free-cutting steel, compared with producing free-cutting steel with die casting mode, production efficiency is high; greatly reduce process energy consumption; increase substantially recovery rate of iron, reduced environmental pollution, adapt to the social orientation of current energy-saving and emission-reduction and environment protection.
Embodiment
The following example light plate is chemical composition designed by the present invention, smelts prepared by continuous casting process, rolling technology and retarded cooling process.
embodiment 1:a kind of Y55 trade mark Cutting free steel plate of the present embodiment, is made up of the component of following weight percent: C 0.58%, Mn 1.10%, Si 0.08%, P 0.025%, S 0.050%, Ca 0.0019%, Ti 0.013%, Alt 0.008%, its surplus is iron Fe and inevitable impurity.Slab thickness 420mm, after rolling, the thickness of steel plate is 115mm.
The smelting of the present embodiment, continuous casting, heating, rolling and cooling in heap technique are as follows:
1) smelting technology: converter decarburization, dephosphorization, not desulfurization, weak deoxidation of setting off, aluminum steel is not fed in argon station, detects oxygen level 30ppm.For improving the recovery rate of Iron sulfuret alloy, refining does not add lime, and refining slag adds 450kg, submerged arc slag add-on 500kg.This smelts the recovery rate 73.4% of Iron sulfuret alloy.Out-station temperature 1550 DEG C;
2) continuous casting process: tundish temperature 1515 DEG C, pulling rate 0.70m/min;
3) heating process: soaking zone: 1240 DEG C.Deposit the stove time (heating total time) at 440 minutes;
4) rolling technology: adopt rolling start rolling temperature in recrystallization zone to be 1035 DEG C, finishing temperature is 1022 DEG C; Air cooling is adopted after hot rolling;
5) retarded cooling process: the steel plate high temperature after rolling rolls off the production line into insulation can slow cooling, inlet temperature is 735 DEG C, 60 hours slow cooling time.
embodiment 2:y55 trade mark Cutting free steel plate produced by a kind of continuous casting steel billet of the present embodiment, is made up of: C 0.50%, Mn 0.9%, Si 0.15% component of following weight percent, P 0.045%, S 0.08%, Ca 0.0015%, Ti 0.010%, Alt 0.015%, its surplus is iron Fe and inevitable impurity.Slab thickness 300mm, after rolling, the thickness of steel plate is 85mm.
The smelting of the present embodiment, continuous casting, heating, rolling and cooling in heap technique are as follows:
1) smelting technology: converter decarburization, dephosphorization, not desulfurization, weak deoxidation of setting off, aluminum steel is not fed in argon station, detects oxygen level 58ppm.Refining does not add lime, and refining slag adds 400kg, submerged arc slag add-on 450kg.This smelts the recovery rate 76.6% of Iron sulfuret alloy.Out-station temperature 1545 DEG C;
2) continuous casting process: tundish temperature 1505 DEG C, pulling rate 0.85m/min;
3) heating process: soaking zone: 1220 DEG C.Deposit the stove time (heating total time) at 300 minutes;
4) rolling technology: adopt rolling start rolling temperature in recrystallization zone to be 1000 DEG C, finishing temperature is 980 DEG C; Air cooling is adopted after hot rolling;
5) retarded cooling process: the steel plate high temperature after rolling rolls off the production line into insulation can slow cooling, inlet temperature is 720 DEG C, 48 hours slow cooling time.
embodiment 3:y55 trade mark Cutting free steel plate produced by a kind of continuous casting steel billet of the present embodiment, be made up of the component of following weight percent: C 0.53%, Mn 0.70%, Si 0.05%, P 0.038%, S 0.15%, Ca 0.0040%, Ti 0.011%, Alt 0.003%, its surplus is iron Fe and inevitable impurity.Slab thickness 250mm, after rolling, the thickness of steel plate is 55mm.
The smelting of the present embodiment, continuous casting, heating, rolling and cooling in heap technique are as follows:
1) smelting technology: converter decarburization, dephosphorization, not desulfurization, weak deoxidation of setting off, aluminum steel is not fed in argon station, detects oxygen level 70ppm.Refining does not add lime, and refining does not add lime, and refining slag adds 350kg, submerged arc slag add-on 400kg.This smelts the recovery rate 81.6% of Iron sulfuret alloy.Out-station temperature 1540 DEG C;
2) continuous casting process: tundish temperature 1525 DEG C, pulling rate 1.0m/min;
3) heating process: soaking zone 1200 DEG C, deposited the stove time (heating total time) at 237 minutes;
4) rolling technology: adopt rolling start rolling temperature in recrystallization zone to be 1050 DEG C, finishing temperature is 1010 DEG C, adopts air cooling after hot rolling;
5) retarded cooling process: the steel plate high temperature after rolling rolls off the production line into insulation can slow cooling, inlet temperature is 760 DEG C, heap cool time 60 hours.
Respectively the steel plate of embodiment 1-3 is sampled, carry out Mechanics Performance Testing, the results are shown in Table 1.
Table 1 Y55 trade mark Cutting free plate property.
As can be seen from Table 1, more than tensile strength Rm 630MPa, elongation after fracture A > 14%, longitudinal V-type 0 DEG C of ballistic work 49 more than J, adopt continuous casting steel billet to produce free-cutting steel and have good mechanical property the invention process result.Because steel medium sulphide content is mingled with about 4.0 grades, inclusion is spindle-type, stub type, and inclusion particle is little and be evenly distributed, and be organized as perlite and discontinuous ferrite, Brinell hardness HBW, in 190 ~ 225 scopes, is easy to machining.Comprehensive mechanical performance and cutting ability are better than hot-rolled state Y45.
Claims (6)
1. a Y55 trade mark Cutting free steel plate, it is characterized in that, chemical composition by mass percent is: 0.50% < C≤0.58%, Si 0.05 ~ 0.15%, Mn 0.70 ~ 1.10%, P0.025 ~ 0.040%, 0.050% < S≤0.150%, Ti 0.010 ~ 0.020%, Ca0.0015 ~ 0.0040%, Alt 0.003 ~ 0.015%, its surplus is iron Fe and inevitable impurity; Described steel plate adopts converter smelting → LF stove refining → sheet billet continuous casting → heating → recrystallize rolling → slow cooling to obtain, its matrix is perlite and discontinuous ferrite, plate property: more than tensile strength Rm 630MPa, elongation after fracture A > 14%, longitudinal V-type 0 DEG C of more than ballistic work 49J, Brinell hardness HBW is in 190 ~ 225 scopes.
2. the manufacture method of a Y55 trade mark Cutting free steel plate, by smelting+continuous casting+recrystallize rolling+steel plate retarded cooling process, it is characterized in that, chemical composition by mass percent is: 0.50% < C≤0.58%, Si 0.05 ~ 0.15%, Mn 0.70 ~ 1.10%, P 0.025 ~ 0.040%, 0.050% < S≤0.150%, Ti 0.010 ~ 0.020%, Ca 0.0015 ~ 0.0040%, Alt0.003 ~ 0.015%, its surplus is iron Fe and inevitable impurity, and its production technique is specific as follows:
1, converter smelting: converter molten iron does not carry out desulfurization, only decarburization and phosphorus, tap 1/4 time to add by silicomanganese-Si-Al-Ba-Fe-iron sulphide order and carry out weak deoxidation, Control for Oxygen Content is at 30 ~ 70ppm;
2, LF stove refining: add refining slag, submerged arc slag, adds iron sulphide and controls sulphur content, do not carry out white slag process, out-station temperature 1540 ~ 1550 DEG C;
3. continuous casting process: tundish temperature controls at 1505 ~ 1525 DEG C, slab casting speed control is at 0.70 ~ 1.0m/min, and secondary cooling water adopts weak cold, and nozzle mist is cold;
4. heating cycle: by hot delivering technology of CC billets, enters process furnace and is heated to 1200 ~ 1240 DEG C, and heating is pressed slab thickness 0.95 ~ 1.05min/mm total time and controlled;
5. rolling, process for cooling: adopt recrystallization zone rolling, start rolling temperature 1000 DEG C, to being less than 1050 DEG C, finishing temperature >=980 DEG C, rolls rear air cooling;
6. retarded cooling process: after hot rolling, steel plate 720 ~ 760 DEG C enters insulation can slow cooling, slow cooling time >=48 hours, its matrix is perlite and discontinuous ferrite, plate property: more than tensile strength Rm 630MPa, elongation after fracture A > 14%, longitudinal V-type 0 DEG C of more than ballistic work 49J, Brinell hardness HBW is in 190 ~ 225 scopes.
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| CN104294161B (en) * | 2014-10-31 | 2016-08-24 | 武汉钢铁(集团)公司 | A kind of for high temperature resistant Cutting free high-strength steel |
| CN106756503B (en) * | 2016-12-27 | 2018-05-22 | 北京首钢吉泰安新材料有限公司 | Free cutting alloy, B alloy wire, its preparation method, nib, pen core and pen |
| CN109252086A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | Production method of high-sulfur steel |
| CN111549287B (en) * | 2020-06-28 | 2021-08-03 | 宝钢特钢韶关有限公司 | Medium carbon steel and production process thereof |
| CN111876689B (en) * | 2020-09-08 | 2022-05-13 | 鞍钢股份有限公司 | Low-carbon selenium-containing free-cutting steel for instruments and manufacturing method thereof |
| CN112080700B (en) * | 2020-09-14 | 2022-02-01 | 新余钢铁股份有限公司 | High-sulfur low-aluminum free-cutting steel continuous casting slab and production method thereof |
| CN113604745A (en) * | 2021-08-12 | 2021-11-05 | 山东钢铁股份有限公司 | High-sulfur free-cutting tool steel bar and preparation method thereof |
| CN114107820B (en) * | 2021-11-26 | 2023-06-02 | 宝武集团鄂城钢铁有限公司 | Steel plate with elongation more than 30% and good cutting performance and production method thereof |
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