CN107699796A - A kind of low-carbon compound automatic steel and its production method - Google Patents

A kind of low-carbon compound automatic steel and its production method Download PDF

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CN107699796A
CN107699796A CN201711146865.9A CN201711146865A CN107699796A CN 107699796 A CN107699796 A CN 107699796A CN 201711146865 A CN201711146865 A CN 201711146865A CN 107699796 A CN107699796 A CN 107699796A
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steel
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cutting
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CN107699796B (en
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高宇波
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Changzhou Bangyi Iron and Steel Co., Ltd.
Zenith Steel Group Co Ltd
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Zenith Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention relates to a kind of compound low-carbon free-cutting steel and its production method with excellent mechanical performance, by the dosage and proportioning that adjust key element, to refining slagging process, continuous casting cooling condition, rolling temperature control and optimization, realize the efficient stable production of low-carbon free-cutting steel, while the higher silicon of hardness, aluminum oxide Cutter wear is reduced, effective control of sulfide is also achieved；By introducing B element, opportunity is added to N/B proportionings, B element and its cooling precipitation is controlled, BN graphite-like structures are given full play to and its for oxide, the positive effect of the compound parcel of sulfide, further improve the machinability of low-carbon free-cutting steel, and cutting ability is reduced to a certain extent for sulfur content according to lazyness, reduce the anisotropy of material mechanical performance, again by adding the elements such as Cu, Cr, effectively realize this mild steel taking into account in terms of free-cutting machinability with mechanical property and balance.

Description

A kind of low-carbon compound automatic steel and its production method
Technical field
The present invention relates to the production method of metallurgy industry automatic steel, more particularly to a kind of producer of low-carbon free-cutting steel Method.
Background technology
Automatic steel extends cutter life due to having in cutting process, reduces resistance to cutting, improves processing table Face finish, the advantages that easy scrap fallaway, more and more extensive application is obtained in automobile and mechanical processing industry, for The research of automatic steel performance is also more and more.At present, automatic steel mainly comprising sulphur system, lead system, calcium system and compound tellurium, selenium, The species such as titanium system, wherein most widely used is resulfurizing series free cutting steel, and in such automatic steel, low-carbon resulfurizing series free cutting steel Due to good cutting ability and chip-breaking performance, significantly being lifted with the growth requirement amount of automatic lathe in recent years.
In order to improve the cutting ability of low-carbon free-cutting steel, it usually needs S elements are added, still, due to sulphur system Cutting free Contain substantial amounts of S elements in steel, add the red brittleness of steel, thus easily occur in the operation of rolling straight on the head, chip off-falling and table The defects of facial cleft line, production difficulty is larger；At the same time, in steel the presence of a large amount of sulfide also increase steel performance it is each to The opposite sex, low-carbon free-cutting steel mechanical property and its less stable and make it that its use range is also significantly limited.Automatic steel Red brittleness is generally relevant with the composition of the sulphide inculsion in steel.The chemical composition of steel, the cooling velocity of continuous casting billet and height Temperature processing has a great impact to the form and composition of sulfide.Patent CN102676955A is prepared for one by the method for molding High sulfur free-cutting steel of the kind with excellent cutting performance, the surface of machining part is improved by adding 0.01~0.03%Te Finish, but the deficiencies of production cost is high, and production efficiency substantially reduces compared with continuous casting be present.Zhang Liwu etc. refines work by improving Skill, realize the improvement of oxide morphology in steel and reduce the probability and size of brittle inclusion appearance, but adjusted from technique From the point of view of whole front and rear analysis indexes data, improvement is relatively limited, and MgO ratios in the increase slag mentioned in this method Measure, the suppression that field trash is harmful to for magnesium aluminate spinel class hard are more unfavorable；Patent CN103397255A has invented one kind Pure BN types low-carbon free-cutting steel, reduce the anisotropy of resulfurizing series free cutting steel performance, however, the steel grade compared with sulphur system Cutting Steel and Speech, the stability of its cutting ability need further to be lifted, and a large amount of B, N element (B ＞ 0.02%, N ＞ 0.02%) plus Enter also deteriorate the toughness of steel, considerably increase the probability of occurrence of strand rimhole, while the steel grade requires the copper of addition Content is up to more than 0.7%, and the copper brittleness problem of steel also certainly will be to the surface quality of steel and becoming a useful person for steel in process of production Rate brings many adverse effects.
The content of the invention
The present invention, which is directed in resulfurizing series free cutting steel in the prior art, contains substantial amounts of S elements, adds the red brittleness of steel, Therefore easily occur in the operation of rolling straight on the head, chip off-falling and the defects of face crack, the larger technical problem of production difficulty, and Low-carbon free-cutting steel mechanical property and less stable and the problem of cause its use range significantly limited, there is provided it is a kind of compound Type low-carbon free-cutting steel and its production method.
Low-carbon free-cutting steel of the present invention includes the composition of following weight/mass percentage composition：C：≤ 0.25%, Si：≤ 0.10%, Mn：0.60~1.20%, P：0.030~0.075%, S：0.12~0.35%, Cr：0.15~0.40%, Cu：0.10~ 0.25%, B：≤ 0.0060%, N：≤ 0.0180%, Al：≤ 0.005%, O：≤ 0.0180%, surplus Fe.
Preferably：Low-carbon free-cutting steel includes the composition of following weight/mass percentage composition：C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~0.050%, S：0.15~0.20%, Cr：0.20~0.28%, Cu： 0.10~0.15%, B：0.0040~0.0055%, N：0.014~0.018%, Al：≤ 0.005%, O:0.0045~ 0.0075%.
Consider the performance requirement of the low-carbon sulphur free-cutting steel, and ambient adaptability, to it is specific smelt into Part is controlled as follows：
C：Phosphorus content increase in steel, cementite tissue is more, and hardness rises, if carbon content is too high, the excessive high hardness of steel, and cutting The abrasion of cutter will be increased in process；And carbon content is too low, easily occur built-up edge in working angles, sticked with rake face Knot, makes machined surface coarse, and the chip discharged is banding, it is difficult to which chip breaking, causes rust of generating heat, causes cutting speed Reduce, the problems such as cutter thermal wear is serious.This automatic steel finished product C content optimal control scope is 0.13~0.16%.
Si：Silicon part is solid-solution in ferrite, strengthens the hardness of steel, and to combine to form hardness with oxygen in steel higher for silicon Silica field trash, make the abrasion of cutter increase, service life reduce, require herein Si control within 0.05%；
Al：Aluminium is combined the tiny brittle aluminate of generation with oxygen, increases the abrasion of cutter；Simultaneously appropriate Al contains Amount is also to obtain the premise of preferable oxide morphology, and Al content requires to control within 0.005% respectively in this steel grade.
P：Phosphorus, which is solid-solution in ferrite, can improve hardness and intensity, reduce toughness, chip is easy to fracture and is excluded, so as to Obtain good processed surface smoothness.As phosphorus content is too high, then plasticity can be significantly reduced, increases hardness, influence steel on the contrary Machinability.Herein, phosphorus control range is 0.035~0.050%.
S：The sulfide that sulphur is formed is added in steel and destroys the continuity of metallic matrix tissue, under external force equivalent to Stress raiser, reduce the resistance to cutting of cutter so that cutting temperature reduces；The fusing point of sulfide is generally relatively low, with cutting Cut the rise of temperature and gradually soften, there is good plastic deformation ability, serve the effect of lubrication, reduce frictional force, The friction between chip and cutter is alleviated, so as to alleviate the abrasion of cutter；In addition, sulfide also has the work of parcel anti-attrition With, when the relatively low sulfide of hardness is wrapped in the oxide surface of high rigidity, alleviate the abrasion of cutter, while further improve plus The finish on work surface.But, excessive sulphur can roll with oxygen, iron generation cocrystalization compound (Fe-FeS, Fe-FeS-FeO) When be easily caused cracking.The target control scope of sulphur is 0.15~0.20% in the steel grade.
Mn：Manganese can improve intensity and form manganese sulfide inclusion thing with sulphur in steel, be easily broken off chip, so as to improve steel Machinability, moreover it is possible to eliminate or weaken the red brittleness caused by sulphur.It is easy at this in order to take into account the optimization of sulphide inculsion form Consider Mn/S controls simultaneously in 5~6.5 scopes in Cutting Steel, Mn control ranges are 0.90~1.05%.
Cr：Chromium can significantly improve intensity, hardness and wearability in steel, but the improvement for plasticity and toughness is unhelpful, this Steel grade adds 0.20~0.28% Cr, on the basis of steel plasticity and toughness is not influenceed, strengthens the supply in terms of intensity.
B：Add appropriate boron and form BN with nitrogen, the BN of hexagonal structure is similar with graphite-structure, can play good lubrication Effect；BN is also lower than MnS for hardness, and energy and Al2O3, MnS etc. be mingled with to form complex inclusion, reduce hard inclusions thing Influence for tool wear；And the BN mechanical properties free from environmental pollution for also not deteriorating steel in steel, to cutting ability There is unique clean and effective in terms of improvement.This steel grade B content control range 0.0040~0.0055%.
N：In this steel grade, nitrogen content is to control an important factor for BN formation is with separating out in good time in steel, according to boron in molten steel, The changing rule of nitrogen actual concentrations understands that the controlling unit that BN is generated and grown up under solidification front liquid phase is the diffusion of nitrogen, is Ensure that B can form BN as far as possible in steel, control N/B ＞ 3 in steel；Though secondly nitrogen can improve the intensity of steel, and can increase is crisp Property, short broken chip breaking can be formed during cutting, (＜ 0.02%) containing trace nitrogen in steel, machinability and machined surface quality, which are risen, to be had Profit effect, but too high levels, the life-span of the invigoration effect increase, then reduction cutter of steel.The target control scope of nitrogen be 0.014~ 0.018%.
O：General steel grade requires that oxygen content is as low as possible, but oxygen content is properly increased in automatic steel can improve sulphur Size, form, distribution and the deformability of compound, so incomplete deoxidation mode is used in steelmaking process, it is pre- to retain The oxygen content of phase promotes the improvement of cutting ability.This steel grade requires free oxygen Of：0.0020-0.0035%, S/Of：35~70, Total oxygen content OtControl range is 0.0045~0.0075%.
Cu：Copper can not only improve the decay resistance of steel, strengthen it under the conditions of Different climate in appropriate add Applicability, and Cu can produce significant precipitation strength effect independent of carbon, nitrogen effect in steel；And copper separate out prior to Austenite changes, can be with fining austenite grains, and therefore, mild steel adds amount of copper, helps to obtain higher-strength and toughness, And improve and improve the combination property such as welding performance and corrosive nature；But copper content should not be too high, otherwise the unfavorable shadow of copper brittleness Ringing can be obvious, therefore this steel grade addition is 0.10~0.15%.
The production method of the low-carbon free-cutting steel of the present invention, its production process route are：Turned using EAF-CONVERTER electricity The process route production automatic steel of stove smelting+LF refining+CCM continuous castings+controlled rolling and controlled cooling.
Production craft step is as follows：
(1) EAF-CONVERTER electricity converter smelting
During production in strict accordance with above-mentioned design chemical Composition Control each component dosage, EAF-CONVERTER electricity converters Tapping taps and stayed steel to operate in order to avoid slag, controls electric converter terminal C >=0.06% using eccentric-bottom stove：Tapping temperature >=1640 ℃；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low-carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime, its In, it is used to adjust P, S, Mn, Cr content with addition of silicomanganese, sulphur iron, ferrophosphorus, low-carbon ferrochromium, low-carbon ferromanganese, ferro-aluminum is as deoxidation after stove Agent, appropriate lime is added as slag is pushed up, then molten steel goes to the refining of LF stoves.
(2) LF refining
Refine and early stage top of the slag deoxidation is carried out using calcium carbide, appropriate lime is added according to slag condition.First is carried out after electrified regulation Sub-sampling, and free oxygen content is determined, silicomanganese and ferrophosphorus, sulphur iron, low-carbon ferrochromium, low Carbon Manganese are added according to the composition that sampling measures Iron, P, Mn, Cr content are adjusted to desired value, S contents and reach the control range upper limit, avoid the refining later stage from being vulcanized benefit sulphur again Operation, this is unfavorable for sulfide and is uniformly distributed in steel；And Mn contents should be controlled in lower limit, in order to avoid refining latter stage feeding nitrogen manganese Mn content overproofs after line.The alloying requirement that red copper completes Cu is then added, continues to heat up, secondary sample is carried out, according to secondary Sample the composition measured and add alloy, carry out P, S, Cr, Cu trimming；Feed nitrogen manganese line and boron simultaneously within 10 minutes before LF bull ladles Iron wire, on the premise of N, B content are adjusted in place in ensureing steel, Mn contents are lifted into close desired value, after the completion of line feeding again Carry out determining oxygen, soft blow 20 minutes；
In refining process, regulation and the control of oxygen content are the key point and difficult point of refining process, are determined in the suitable time The oxygen content gone out, it is to judge whether deoxidation reaches the foundation of requirement, according to determining oxygen situation with low aluminium ferro-aluminum or feed appropriate calcium line Deoxidation is carried out, the denaturation and oxide morphology control of the feeding of appropriate calcium line to field trash are also beneficial.Oxygen content in steel is influenceed A very big factor is slag making basicity, and dissolved oxygen content reduces with the rise of basicity of slag in steel, because high alkalinity is by force also Desulphurization [O] content of originality clinker is relatively low, and absorption deoxidation products ability is strong, thus reduces oxygen content in steel.Production should Free oxygen control is required during steel grade 0.0020~0.0035%, it is in order to avoid the excessive deoxidation of high basicity slag and excessive to what is be mingled with Absorption, the basicity of refining slag is unsuitable too high, and the dual alkalinity control of refining finishing slag is 2.0~2.8, in order to obtain the stove of appropriate basicity Slag, on Mn alloy proportions, on the premise of ensureing that Si is not exceeded, particularly tapping process and refining should use silicon initial stage more Manganese；In production, in order to prevent the excessive situation of deoxidation, also need the iron scale for preparing some dryings if necessary simultaneously Oxygenation.
(3) continuous casting is cast
Cast in continuous casting casting cycle using whole process protection, using high-sulfur steel mould flux, to solve common covering slag It is easy to cause to fail due to composition transfer, casting sequence is low, easy bleed-out and the problems such as cause casting billet surface, surface defect, The degree of superheat is controlled at 20~30 DEG C, improves Inner Quality of Billet using M-EMS, two is cold using weak cold pattern, reduces Intensity of cooling, sulfide and boron nitride size in strand can be effectively improved, while make strand by avoiding heat during straightening area Crisp area, reduce the generation of slab surface crack.
(4) rolling cooling
Gained strand delivers to stocking factory heating furnace, to avoid the high-sulfur steel brittle temperature range, it is desirable to using high temperature rolling Technique, and the target temperature of whole rolling is not less than 1020 DEG C；The operation of rolling controls 1150 ± 20 DEG C of roughing temperature, finish rolling temperature 1050 ± 20 DEG C of degree, water is worn after rolling and is quickly cooled to 900 ± 25 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
Beneficial effect
This patent is by composition design, key element content and burden control, and refining process feeds and slagging process, continuous casting The control and optimization of the whole process key links such as process cooling, operation of rolling temperature and parameter, not only realize the low-carbon sulfur-bearing The efficient stable production of automatic steel, while the higher silicon of hardness, aluminum oxide Cutter wear is reduced, also effectively realize The lifting of sulfide size, form, distributed controll；And by introducing B element, the quantization to N/B proportionings, adding opportunity Selection, solidification separate out the control of cooling, have given full play to BN graphite-like structure and its for oxide, the compound bag of sulfide The positive effect of wrap up in etc., cutting ability is reduced to a certain extent for sulfur content according to lazyness, is ensureing well to cut On the premise of cutting performance, the stability of the mechanics of materials is improved, reduces the anisotropy of material mechanical performance, so as to effectively carry The high combination property of the compound low-carbon free-cutting steel.
Embodiment
The present invention is described in further detail with reference to embodiment：
Embodiment 1：
Easily cut using the process route production low-carbon of EAF-CONVERTER electricity converter smelting → LF stoves refining → CCM continuous castings Cut steel.
Smelt the control of finished product composition：C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~ 0.050%, S：0.15~0.20%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：0.0040~0.0055%, N： 0.014~0.018%, Al：≤ 0.005%, O:0.0045~0.0075%, surplus Fe.
Electric converter is used as raw material using molten iron, the pig iron and high-quality steel scrap, and total charge weight is controlled at 109 tons, hot metal ratio 89%, Pig iron addition is 5.5 tons, and remaining is high-quality steel scrap.Tap terminal composition C：0.07%th, P：0.016%th, tapping temperature T： 1661 DEG C, 93.5 tons of tap, using eccentric bottom tapping, forbid slag；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low Carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime.Tapping terminates to carry out determining oxygen after stove, and measuring free oxygen content is 52ppm, LF stoves are gone to immediately.
1542 DEG C of LF seat bags temperature, be powered heating, carries out deoxidation, electrified regulation 8 minutes using 50kg calcium carbides refining early stage First time sampling is carried out afterwards, and it is 35ppm to carry out determining oxygen to measure free oxygen content；Added on a small quantity after composition is measured by sampling for the first time Silicomanganese and appropriate ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese, the additional amount requirement of alloy adjust P, Cr content to desired value, S contents should reach the control range upper limit after the first sub-sampling, avoid subsequently largely adding sulphur iron, also, consider follow-up nitrogen Manganese line increases manganese, and Mn contents adjust and to target zone lower limit, then add the alloying requirement that red copper completes Cu；It is continuously heating to 1571 DEG C, secondary sample is then carried out, alloy is added according to two sample ingredients, carries out P, S, Cr, Cu trimming, and determine oxygen and measure Free oxygen content is 29ppm；Feed nitrogen manganese line and ferro-boron line simultaneously within 10 minutes before LF bull ladles, N, B content adjustment in steel is ensured On the premise of in place, Mn contents are lifted close to desired value as far as possible, carries out determining oxygen again after the completion of line feeding, measures free oxygen content For 28ppm；Soft blow 20 minutes, then turn continuous casting and cast, refining finishing slag dual alkalinity is 2.6.
23 DEG C of the continuous casting degree of superheat, casting blank section 220mm*260mm, a cold water flow 102m3/ h, 30.5 DEG C of inflow temperature, One 7.9 DEG C of the cold water temperature difference, Water Rate for Secondary Cooling Water 0.3L/kg, pulling rate 0.88m/min, using sulfur bearing steel mould flux, open knot Brilliant device electromagnetic agitation simultaneously uses whole process molding casting, and strand enters 963~986 DEG C of withdrawal straightening machine temperature.Strand sample detects composition：
C：0.14%, Si：0.02%, Mn：1.01%, P：0.043%, S：0.182%, Cr：0.25%, Cu：0.12%, Al：0.002%, B：0.0046%, N：0.0167%, Ot：0.0055%, surplus Fe.
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 22mm.During rolling, 1140 DEG C of roughing temperature, finish rolling 1035 DEG C of temperature, water is worn after rolling and is quickly cooled to 902 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
Embodiment 2
Easily cut using the process route production low-carbon of EAF-CONVERTER electricity converter smelting → LF stoves refining → CCM continuous castings Cut steel.
Smelt the control of finished product composition：C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~ 0.050%, S：0.15~0.20%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：≤ 0.0030%, N：≤ 0.0120%, Al：≤ 0.005%, O:0.0045~0.0075%, surplus Fe.
Electric converter is used as raw material using molten iron, the pig iron and high-quality steel scrap, and total charge weight is controlled at 108 tons, hot metal ratio 91%, Pig iron addition is 5.1 tons, and remaining is high-quality steel scrap.Tap terminal composition C：0.07%th, P：0.016%th, tapping temperature T： 1659 DEG C, 93.6 tons of tap, using eccentric bottom tapping, forbid slag；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low Carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime.Tapping terminates to carry out determining oxygen after stove, and measuring free oxygen content is 62ppm, LF stoves are gone to immediately.
1543 DEG C of LF seat bags temperature, be powered heating, carries out deoxidation, electrified regulation 8 minutes using 60kg calcium carbides refining early stage First time sampling is carried out afterwards, and it is 26ppm to carry out determining oxygen to measure free oxygen content；Added on a small quantity after composition is measured by sampling for the first time Silicomanganese and appropriate ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese, the additional amount requirement of alloy adjust P, Mn, Cr content to target It is worth, should reaches the control range upper limit after the sub-sampling of S contents first, avoid subsequently largely adding sulphur iron, then adds copper and complete Cu Alloying requirement；Be continuously heating to 1576 DEG C, then carry out secondary sample, alloy is added according to two sample ingredients, carry out P, S, Mn, Cr, Cu trimming, and it is 31ppm to determine oxygen to measure free oxygen content；Soft blow 20 minutes, then turn continuous casting and cast, refine Finishing slag dual alkalinity 2.5.
23 DEG C of the continuous casting degree of superheat, casting blank section 220mm*260mm, a cold water flow 100m3/ h, 32 DEG C of inflow temperature, one 7.5 DEG C, Water Rate for Secondary Cooling Water 0.3L/kg, pulling rate 0.88m/min of the cold water temperature difference, using sulfur bearing steel mould flux, open crystallization Device electromagnetic agitation simultaneously uses whole process molding casting, and strand enters 961~980 DEG C of withdrawal straightening machine temperature.Strand sample detects composition：
C：0.15%, Si：0.02%, Mn：1.00%, P：0.041%, S：0.186%, Cr：0.23%, Cu：0.11%, Al：0.003%, B：0.0004%, N：0.0029%, Ot：0.0061%, surplus Fe.
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 22mm.During rolling, 1151 DEG C of roughing temperature, finish rolling 1047 DEG C of temperature, water is worn after rolling and is quickly cooled to 898 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
Embodiment 3
Easily cut using the process route production low-carbon of EAF-CONVERTER electricity converter smelting → LF stoves refining → CCM continuous castings Cut steel.
Smelt the control of finished product composition：C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~ 0.050%, S：0.20~0.35%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：≤ 0.0030%, N：≤ 0.0120%, Al：≤ 0.005%, O:0.0080~0.0120%, surplus Fe.
Electric converter is used as raw material using molten iron, the pig iron and high-quality steel scrap, and total charge weight is controlled at 109 tons, hot metal ratio 86%, Pig iron addition is 4.5 tons, and remaining is high-quality steel scrap.Tap terminal composition C：0.06%th, P：0.013%th, tapping temperature T： 1659 DEG C, 93.8 tons of tap, using eccentric bottom tapping, forbid slag；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low Carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime.Tapping terminates to carry out determining oxygen after stove, and measuring free oxygen content is 58ppm, LF stoves are gone to immediately.
1548 DEG C of LF seat bags temperature, be powered heating, carries out deoxidation, electrified regulation 8 minutes using 20kg calcium carbides refining early stage First time sampling is carried out afterwards, and it is 49ppm to carry out determining oxygen to measure free oxygen content；Added on a small quantity after composition is measured by sampling for the first time Silicomanganese and appropriate ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese, the additional amount requirement of alloy adjust P, Mn, Cr content to target It is worth, should reaches the control range upper limit after the sub-sampling of S contents first, avoid subsequently largely adding sulphur iron, then adds copper and complete Cu Alloying requirement；Be continuously heating to 1579 DEG C, then carry out secondary sample, alloy is added according to two sample ingredients, carry out P, S, Mn, Cr, Cu trimming, and it is 41ppm to determine oxygen to measure free oxygen content, it is relatively low compared with control range is required, 10kg is added immediately Iron scale, argon gas is increased after adding and is slightly stirred, carries out determining oxygen again, it is 47ppm to measure free oxygen content；Soft blow 20 Minute, go to continuous casting and cast, refining finishing slag dual alkalinity is 2.2.
28 DEG C of the continuous casting degree of superheat, casting blank section 220mm*260mm, a cold water flow 100m3/ h, 31.5 DEG C of inflow temperature, One 8.1 DEG C of the cold water temperature difference, Water Rate for Secondary Cooling Water 0.3L/kg, pulling rate 0.88m/min, using high-sulfur steel mould flux, open knot Brilliant device electromagnetic agitation simultaneously uses whole process molding casting, and strand enters 968~989 DEG C of withdrawal straightening machine temperature.Strand sample detects composition：
C：0.14%, Si：0.03%, Mn：1.00%, P：0.041%, S：0.268%, Cr：0.24%, Cu：0.13%, Al：0.001%, B：0.0003%, N：0.0032%, Ot：0.0096%, surplus Fe.
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 22mm.During rolling, 1155 DEG C of roughing temperature, finish rolling 1058 DEG C of temperature, water is worn after rolling and is quickly cooled to 906 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
Embodiment 4
Easily cut using the process route production low-carbon of EAF-CONVERTER electricity converter smelting → LF stoves refining → CCM continuous castings Cut steel.
Smelt the control of finished product composition：C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~ 0.050%, S：0.20~0.35%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：≤ 0.0030%, N：≤ 0.0120%, Al：≤ 0.005%, O:≤ 0.0120%, surplus Fe.
Electric converter is used as raw material using molten iron, the pig iron and high-quality steel scrap, and total charge weight is controlled at 106 tons, hot metal ratio 92%, Pig iron addition is 4.2 tons, and remaining is high-quality steel scrap.Tap terminal composition C：0.09%th, P：0.018%th, tapping temperature T： 1655 DEG C, 92.7 tons of tap, using eccentric bottom tapping, forbid slag；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low Carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime.Tapping terminates to carry out determining oxygen after stove, and measuring free oxygen content is 59ppm, LF stoves are gone to immediately.
1539 DEG C of LF seat bags temperature, be powered heating, carries out deoxidation, electrified regulation 8 minutes using 60kg calcium carbides refining early stage First time sampling is carried out afterwards, and it is 37ppm to carry out determining oxygen to measure free oxygen content；Added on a small quantity after composition is measured by sampling for the first time Silicomanganese and appropriate ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese, the additional amount requirement of alloy adjust P, Mn, Cr content to target It is worth, should reaches the control range upper limit after the sub-sampling of S contents first, avoid subsequently largely adding sulphur iron, then adds copper and complete Cu Alloying requirement；Be continuously heating to 1576 DEG C, then carry out secondary sample, alloy is added according to two sample ingredients, carry out P, S, Mn, Cr, Cu trimming, and it is 12ppm to determine oxygen to measure free oxygen content；Soft blow 20 minutes, then turn continuous casting and cast, refine Finishing slag dual alkalinity 3.7.
26 DEG C of the continuous casting degree of superheat, casting blank section 220mm*260mm, a cold water flow 102m3/ h, 30 DEG C of inflow temperature, one 7.7 DEG C, Water Rate for Secondary Cooling Water 0.3L/kg, pulling rate 0.88m/min of the cold water temperature difference, using high-sulfur steel mould flux, open crystallization Device electromagnetic agitation simultaneously uses whole process molding casting, and strand enters 963~987 DEG C of withdrawal straightening machine temperature.Strand sample detects composition：
C：0.15%, Si：0.01%, Mn：0.99%, P：0.041%, S：0.252%, Cr：0.24%, Cu：0.12%, Al：0.004%, B：0.0005%, N：0.0038%, Ot：0.0026%, surplus Fe.
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 22mm.During rolling, 1158 DEG C of roughing temperature, finish rolling 1052 DEG C of temperature, water is worn after rolling and is quickly cooled to 900 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
Embodiment 5：
Easily cut using the process route production low-carbon of EAF-CONVERTER electricity converter smelting → LF stoves refining → CCM continuous castings Cut steel.
Smelt the control of finished product composition：C：0.13~0.16%, Si：≤ 0.35%, Mn：0.90~1.05%, P：0.035~ 0.050%, S：0.15~0.20%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：0.0040~0.0055%, N： 0.014~0.018%, Al：≤ 0.035%, O:0.0030~0.0075%, surplus Fe.
Electric converter is used as raw material using molten iron, the pig iron and high-quality steel scrap, and total charge weight is controlled at 105 tons, hot metal ratio 90%, Pig iron addition is 4.6 tons, and remaining is high-quality steel scrap.Tap terminal composition C：0.07%th, P：0.013%th, tapping temperature T： 1663 DEG C, 92.5 tons of tap, using eccentric bottom tapping, forbid slag；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low Carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime.Tapping terminates to carry out determining oxygen after stove, and measuring free oxygen content is 54ppm, LF stoves are gone to immediately.
1542 DEG C of LF seat bags temperature, be powered heating, is entered using 20kg calcium carbides, 20kg carborundum, 10kg aluminum shots refining early stage Row deoxidation, electrified regulation carry out first time sampling after 8 minutes, and it is 29ppm to carry out determining oxygen to measure free oxygen content；Take for the first time A small amount of silicomanganese, ferrosilicon and appropriate ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese are added after sample measure composition, the additional amount of alloy will Ask to adjust P, Cr content to desired value, S contents and should reach the control range upper limit after the first sub-sampling, avoid follow-up a large amount of benefits Add sulphur iron, also, increase manganese in view of follow-up nitrogen manganese line, Mn contents are adjusted to target zone lower limit, are then added red copper and are completed Cu alloying requirement；Be continuously heating to 1573 DEG C, then carry out secondary sample, alloy is added according to two sample ingredients, carry out P, S, Cr, Cu trimming, and it is 21ppm to determine oxygen to measure free oxygen content；Feed nitrogen manganese line and boron simultaneously within 10 minutes before LF bull ladles Iron wire, on the premise of N, B content are adjusted in place in ensureing steel, Mn contents are lifted to close desired value as far as possible, after the completion of line feeding Carry out determining oxygen again, it is 18ppm to measure free oxygen content；Soft blow 20 minutes, then turn continuous casting and cast, refine finishing slag diacidic base Spend for 2.3.
25 DEG C of the continuous casting degree of superheat, casting blank section 220mm*260mm, a cold water flow 100m3/ h, 31.5 DEG C of inflow temperature, One 7.2 DEG C of the cold water temperature difference, Water Rate for Secondary Cooling Water 0.3L/kg, pulling rate 0.88m/min, using sulfur bearing steel mould flux, open knot Brilliant device electromagnetic agitation simultaneously uses whole process molding casting, and strand enters 967~989 DEG C of withdrawal straightening machine temperature.Strand sample detects composition：
C：0.14%, Si：0.15%, Mn：1.02%, P：0.042%, S：0.172%, Cr：0.24%, Cu：0.11%, Al：0.008%, B：0.0046%, N：0.0165%, Ot：0.0032%, surplus Fe.
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 22mm.During rolling, 1145 DEG C of roughing temperature, finish rolling 1038 DEG C of temperature, water is worn after rolling and is quickly cooled to 901 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
Embodiment 6：
Easily cut using the process route production low-carbon of EAF-CONVERTER electricity converter smelting → LF stoves refining → CCM continuous castings Cut steel.
Smelt the control of finished product composition：C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~ 0.050%, S：0.15~0.20%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：0.0040~0.0055%, N： 0.014~0.018%, Al：≤ 0.005%, O:0.0045~0.0075%, surplus Fe.
Electric converter is used as raw material using molten iron, the pig iron and high-quality steel scrap, and total charge weight is controlled at 108 tons, hot metal ratio 91%, Pig iron addition is 4.2 tons, and remaining is high-quality steel scrap.Tap terminal composition C：0.08%th, P：0.018%th, tapping temperature T： 1658 DEG C, 92.8 tons of tap, using eccentric bottom tapping, forbid slag；Tapping process sequentially adds appropriate ferro-aluminum, silicomanganese, low Carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime.Tapping terminates to carry out determining oxygen after stove, and measuring free oxygen content is 49ppm, LF stoves are gone to immediately.
1540 DEG C of LF seat bags temperature, be powered heating, carries out deoxidation, electrified regulation 8 minutes using 50kg calcium carbides refining early stage First time sampling is carried out afterwards, and it is 32ppm to carry out determining oxygen to measure free oxygen content；Ferro-boron is fed after composition is measured by sampling for the first time Line simultaneously adds a small amount of silicomanganese and appropriate ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese, and the additional amount requirement of alloy contains B, P, Cr Amount is adjusted to desired value, S contents should reach the control range upper limit after the first sub-sampling, avoid subsequently largely adding sulphur iron, and And, it is contemplated that follow-up nitrogen manganese line increases manganese, and Mn contents are adjusted to target zone lower limit, then add the alloying that red copper completes Cu It is required that；Be continuously heating to 1575 DEG C, then carry out secondary sample, alloy is added according to two sample ingredients, carry out P, S, B, Cr, Cu into Divide fine setting, and it is 26ppm to determine oxygen to measure free oxygen content；10 minutes feeding nitrogen manganese lines before LF bull ladles, N content is adjusted in steel is ensured It is whole in place on the premise of, Mn contents are lifted close to desired value as far as possible, carries out determining oxygen again after the completion of line feeding, measures free oxygen and contain Measure as 27ppm；Soft blow 20 minutes, then turn continuous casting and cast, refining finishing slag dual alkalinity is 2.5.
21 DEG C of the continuous casting degree of superheat, casting blank section 220mm*260mm, a cold water flow 103m3/ h, 29 DEG C of inflow temperature, one 7.6 DEG C, Water Rate for Secondary Cooling Water 0.3L/kg, pulling rate 0.88m/min of the cold water temperature difference, using sulfur bearing steel mould flux, open crystallization Device electromagnetic agitation simultaneously uses whole process molding casting, and strand enters 966~989 DEG C of withdrawal straightening machine temperature.Strand sample detects composition：
C：0.14%, Si：0.02%, Mn：1.02%, P：0.045%, S：0.182%, Cr：0.26%, Cu：0.12%, Al：0.002%, B：0.0048%, N：0.0162%, Ot：0.0058%, surplus Fe.
Gained blank hot delivers to stocking factory heating furnace, rolling specs Φ 22mm.During rolling, 1145 DEG C of roughing temperature, finish rolling 1040 DEG C of temperature, water is worn after rolling and is quickly cooled to 900 DEG C, cold bed on subsequent stocking, heap is cold after completing collecting and baling.
The rolled mechanical property of the round steel sample produced under the conditions of the various embodiments described above, sulfide are examined and cutting uses Situation is to shown in such as table 1 and table 2：
The mechanical property of table 1 and sulfide examine situation contrast
Table 2 cuts service condition contrast *
* cutting ability contrast test uniformly uses the hard alloy cutter of identical material, the cutting speed in 2000r/min Degree, the 0.05mm/r amount of feeding, 1.0mm cutting depth under the conditions of carry out.

Claims (4)

  1. A kind of 1. low-carbon free-cutting steel, it is characterised in that：The low-carbon free-cutting steel includes the composition of following weight/mass percentage composition, C：≤ 0.25%, Si：≤ 0.10%, Mn：0.60~1.20%, P：0.030~0.075%, S：0.12~0.35%, Cr：≤ 0.50%, Cu：≤ 0.25%, B：≤ 0.0060%, N：≤ 0.018%, Al：≤ 0.005%, O：≤ 0.0180%.
  2. 2. low-carbon free-cutting steel as claimed in claim 1, it is characterised in that：The low-carbon free-cutting steel includes following quality hundred Divide the composition of content, C：0.13~0.16%, Si：≤ 0.05%, Mn：0.90~1.05%, P：0.035~0.050%, S： 0.15~0.20%, Cr：0.20~0.28%, Cu：0.10~0.15%, B：0.0040~0.0055%, N：0.014~ 0.018%, Al：≤ 0.005%, O:0.0045~0.0075%.
  3. A kind of 3. production method of low-carbon free-cutting steel as claimed in claim 1, it is characterised in that：The production method step It is as follows：
    (1) EAF-CONVERTER electricity converter smelting
    Electric converter is using eccentric bottom tapping and stays steel to operate, and forbids slag of tapping, electric converter terminal C >=0.06%, tapping temperature >=1640 DEG C, tapping process sequentially adds aluminium block, silicomanganese, low-carbon ferromanganese, low-carbon ferrochromium, ferrophosphorus, sulphur iron, carburant, lime；
    (2) LF refining
    Refine and early stage top of the slag deoxidation is carried out using calcium carbide, first time sampling is carried out after electrified regulation, and determine free oxygen content, root The composition measured according to sampling adds silicomanganese and ferrophosphorus, sulphur iron, low-carbon ferrochromium, low-carbon ferromanganese, and P, Mn, Cr content are adjusted to target Value, S contents reach the control range upper limit, and the control of Mn contents completes Cu alloying requirement in lower limit, then addition red copper, after Temperature of continuing rising, secondary sample is carried out, the composition measured according to secondary sample adds alloy, carries out P, S, Cr, Cu trimming；LF is hung Feed nitrogen manganese line and ferro-boron line simultaneously within 10 minutes before bag, on the premise of N, B content are adjusted in place in ensureing steel, Mn contents are carried Desired value is risen to, carries out determining oxygen, soft blow 20 minutes again after the completion of line feeding, and controls refining finishing slag dual alkalinity；
    (3) continuous casting is cast
    Cast in continuous casting casting cycle using whole process protection, using sulfur bearing steel mould flux, the degree of superheat is controlled at 20~30 DEG C, Using M-EMS, two is cold using weak cold pattern；
    (4) rolling cooling
    Using high temperature rolling technique, the operation of rolling 1150 ± 20 DEG C of roughing temperature of control, 1050 ± 20 DEG C of final rolling temperature, worn after rolling Water is quickly cooled to 900 ± 25 DEG C, and cold bed on subsequent stocking, heap is cold after completing collecting and baling.
  4. 4. the production method of low-carbon free-cutting steel as claimed in claim 3, it is characterised in that：Step (2) described refining process In, free oxygen content control is controlled 2.0~2.8 in 20~35ppm, refining finishing slag dual alkalinity.
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN109778073A (en) * 2019-02-20 2019-05-21 宝钢特钢长材有限公司 A kind of Cutting free automobile synchronizer steel and preparation method thereof
CN109988972A (en) * 2019-04-23 2019-07-09 中天钢铁集团有限公司 A kind of low-carbon sulfur-bearing air conditioner tube round steel and its production technology
CN110055374A (en) * 2019-06-10 2019-07-26 上海工程技术大学 A kind of method of added Oxides control automatic steel oxide morphology
CN110904395A (en) * 2019-12-17 2020-03-24 芜湖新兴铸管有限责任公司 Sulfur-containing free-cutting steel and smelting method thereof
CN111154948A (en) * 2020-01-03 2020-05-15 广东韶钢松山股份有限公司 Smelting method for controlling oxygen content in steel casting blank
CN111876689A (en) * 2020-09-08 2020-11-03 鞍钢股份有限公司 Low-carbon selenium-containing free-cutting steel for instruments and manufacturing method thereof
CN112063916A (en) * 2020-05-12 2020-12-11 上海大学 Preparation method of magnesium-based high-sulfur free-cutting steel
CN112962017A (en) * 2021-02-03 2021-06-15 长泰县兴宏驰工贸有限公司 Smelting process of low-carbon high-sulfur free-cutting steel
CN115747623A (en) * 2022-11-18 2023-03-07 宝武杰富意特殊钢有限公司 Method for improving surface quality of large-section low-carbon high-sulfur free-cutting steel casting blank

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CN1718828A (en) * 2005-06-30 2006-01-11 宝山钢铁股份有限公司 Low carbon high sulfur phosphorus easy cutting steel
CN102676955A (en) * 2012-06-06 2012-09-19 安徽工业大学 Low-carbon high-sulfur free-cutting steel with excellent cutting performance and manufacturing method thereof
CN105779907A (en) * 2016-03-19 2016-07-20 上海大学 Free-cutting steel containing magnesium and calcium and production process

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CN1718828A (en) * 2005-06-30 2006-01-11 宝山钢铁股份有限公司 Low carbon high sulfur phosphorus easy cutting steel
CN102676955A (en) * 2012-06-06 2012-09-19 安徽工业大学 Low-carbon high-sulfur free-cutting steel with excellent cutting performance and manufacturing method thereof
CN105779907A (en) * 2016-03-19 2016-07-20 上海大学 Free-cutting steel containing magnesium and calcium and production process

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109778073A (en) * 2019-02-20 2019-05-21 宝钢特钢长材有限公司 A kind of Cutting free automobile synchronizer steel and preparation method thereof
CN109988972A (en) * 2019-04-23 2019-07-09 中天钢铁集团有限公司 A kind of low-carbon sulfur-bearing air conditioner tube round steel and its production technology
CN110055374A (en) * 2019-06-10 2019-07-26 上海工程技术大学 A kind of method of added Oxides control automatic steel oxide morphology
CN110904395A (en) * 2019-12-17 2020-03-24 芜湖新兴铸管有限责任公司 Sulfur-containing free-cutting steel and smelting method thereof
CN111154948A (en) * 2020-01-03 2020-05-15 广东韶钢松山股份有限公司 Smelting method for controlling oxygen content in steel casting blank
CN112063916A (en) * 2020-05-12 2020-12-11 上海大学 Preparation method of magnesium-based high-sulfur free-cutting steel
CN111876689A (en) * 2020-09-08 2020-11-03 鞍钢股份有限公司 Low-carbon selenium-containing free-cutting steel for instruments and manufacturing method 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
CN112962017A (en) * 2021-02-03 2021-06-15 长泰县兴宏驰工贸有限公司 Smelting process of low-carbon high-sulfur free-cutting steel
CN115747623A (en) * 2022-11-18 2023-03-07 宝武杰富意特殊钢有限公司 Method for improving surface quality of large-section low-carbon high-sulfur free-cutting steel casting blank
CN115747623B (en) * 2022-11-18 2024-04-26 宝武杰富意特殊钢有限公司 Method for improving surface quality of large-section low-carbon high-sulfur free-cutting steel casting blank

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