CN103966531A - Production method for low carbon high sulfur free-cutting steel with excellent sulfide modality - Google Patents
Production method for low carbon high sulfur free-cutting steel with excellent sulfide modality Download PDFInfo
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Abstract
The invention discloses a production method for low carbon high sulfur free-cutting steel with excellent sulfide modality. Under the precondition that all the conventional production conditions are not changed and no other alloying element is added, measures are taken to control total oxygen content at 150-200 ppm, crystallizer water-carrying capacity at 1700-1900 L/min, second cooling zone specific water flow at 0.7-0.9 L/kg, heating furnace temperature at 1230-1280 DEG C, starting rolling temperature at 1100-1130 DEG C, finishing rolling temperature at 1050-1120 DEG C and the like, so as to solve the problem of low cutting performance of low carbon high sulfur free-cutting steel caused by poor sulfide modality in the prior art. Sulfide in free-cutting steel hot rolling steel wires produced by the invention has the characteristics that the mean diameter is greater than or equal to 3 Mu m, the unit area number is greater than or equal to 1000/mm<2>, the area ratio is greater than or equal to 1.1 %, the sulfide with the length-width ratio greater than or equal to 10 is below 25 %.
Description
Technical field
The invention belongs to free-cutting steel field, particularly a kind of production method of low carbon high sulfur free-cutting steel of oxide morphology excellence.
Background technology
Level of automation increase along with machined part, is also improving constantly the requirement of work material cutting ability.Free-cutting steel is owing to having good comprehensive mechanical property, high working (machining) efficiency and low tooling cost, is widely used in the industries such as machining amount is large, level of automation is high automobile, household electrical appliances, instrument.
Resulfurizing series free cutting steel is most widely used, accounts for 90% of China's free-cutting steel total amount.Sulphur mainly with the formal distribution of sulfide in free-cutting steel, sulfide inclusion has very important impact to cutting ability.In working angles, sulfide, as stress raiser, plays and cuts off the successional effect of collective, has significantly improved the chip breaking of car bits, and its lubrication can reduce tool wear simultaneously, improves the work-ing life of cutter.Spherical or fusiform sulfide is the most obvious to the improvement of cutting ability, however at course of hot rolling medium sulphide content, easily along rolling direction, extend, unfavorable to cutting ability, also make in addition the transverse mechanical performance of steel obviously reduce.
In order to improve the cutting ability of resulfurizing series free cutting steel, the form that need to control steel medium sulphide content is spherical or fusiform.Domestic patent is mostly by adding the elements such as tellurium, zirconium, rare earth and titanium to improve cutting ability.Patent CN102676955 adopts die casting to produce free-cutting steel, by adding Te unit, usually improves cutting ability, and its deficiency is that production cost is higher, and start rolling temperature is up to 1200～1250 ℃, is not suitable for Workshop Production.During patent CN102816979B adopts, billet continuous casting is produced free-cutting steel, and cost is higher, and Molten Steel over-oxidation is serious during converter smelting, adopts Al deoxidation meeting to form Al
2o
3be mingled with, affect cutting ability.The present invention adopts continuous small-billet casting, does not add other alloying elements, controls the form of steel medium sulphide content by optimized production process, produces the free-cutting steel that surface smoothness is high, cutting ability is excellent, has saved cost, has splendid economic benefit.
Summary of the invention
The present invention aims to provide a kind of production method of low carbon high sulfur free-cutting steel of oxide morphology excellence, by controlling oxygen content in steel, continuous casting process for cooling and hot-rolled heating technology, solve low carbon high sulfur free-cutting steel in prior art and because oxide morphology is poor, cause the poor problem of cutting ability.
Technical scheme provided by the invention is:
A production method for the low carbon high sulfur free-cutting steel of oxide morphology excellence, the steps include:
(1) eaf tapping point carbon content control is 0.03～0.05%, and tapping temperature is 1610～1640 ℃.Slag tapping is stayed in employing, adds according to the order of sequence 1.5～2.5kg/t silicomanganese, 10～15kg/t low carbon ferromanganese, 10～13kg/t sulfurous iron ore, 1～2kg/t kakoxene to carry out alloying in tapping process, adds the special-purpose synthetic slag of 6～8kg/t and the slag making of 1～2kg/t lime.
(2) in refining slag, TFe content is 3～5%, and the refining later stage feeds 80～100 meters of sulphur cored-wires in molten steel.Before tapping, in molten steel, free Control for Oxygen Content is at 50～100ppm, and tapping liquid steel temperature is 1560～1590 ℃.
(3) continuous casting adopts free-cutting steel mould flux, and crystallizer discharge is 1700～1900L/min, and two cold-zones adopt spray cooling, and specific water is 0.7～0.9L/kg, and pulling rate is 2.0～2.6m/min.
(4) furnace temp is 1230～1280 ℃, insulation 0.5～1.5h.Start rolling temperature is 1100～1130 ℃, and finishing temperature is 1050～1120 ℃, and stelmo line speed of cooling is 0.5～1.5K/s.
A production method for the low carbon high sulfur free-cutting steel of oxide morphology excellence, the total oxygen content that is bundled into product sample in the middle of it is controlled at 150～200ppm.
A production method for the low carbon high sulfur free-cutting steel of oxide morphology excellence, its strand is of a size of 140mm * 140mm.
A production method for the low carbon high sulfur free-cutting steel of oxide morphology excellence, the Brinell hardness of its As rolled wire rod is 120～130.
A production method for the low carbon high sulfur free-cutting steel of oxide morphology excellence, its As rolled wire rod medium sulphide content has following character: mean diameter>=3 μ m, unit surface number>=1000/mm
2, area accounting>=1.1%, the sulfide of long-width ratio>=10 accounts for below 25%.
The know-why of processing parameter in the present invention:
Good hardness and metallographic structure thereof are the important factor in order that cutting ability is improved, and therefore for low carbon high sulfur free-cutting steel, require finished product carbon content control 0.05～0.10%.Too high carbon content, free-cutting steel Medium pearlite content increases, and the intensity of steel and hardness increase, and are unfavorable for machining; When carbon content is too low, free-cutting steel Medium pearlite content reduces, and the intensity of steel and lower hardness easily glue cutter, are not easy chip breaking during machining.Because the claimed range of finished product carbon content is narrower, for avoiding the carburetting in follow-up refining and casting process, therefore need to, by eaf tapping point carbon content control 0.03～0.05%, in refining process, not use calcium carbide deoxidation.
During refining tapping, free oxygen need be controlled at 50～100ppm, being conducive at a large amount of Mn-Fe-O of molten steel solidification early origin is oxide particle, these oxide compounds form the heterogeneous nuclei of sulfide forming core, promote sulfide to separate out, form (Mn, Fe) (S, O) complex inclusion, this type impurity at high temperature plasticity is poor, and in course of hot rolling, distortion difficulty, makes the complex inclusion in wire rod be fusiform.But the too high difficulty that can increase casting process of oxygen concn, reduces cc billet surface quality, and casting blank defect is increased.
Because refining slag oxidisability is higher, in refining slag, TFe content is controlled at 3～5%, thereby guarantees that entire oxygen content in the steel content is in institute's claimed range.
Crystallizer discharge is controlled at 1700～1900L/min, and lower discharge can reduce blank surface chill thickness, makes the tiny area decreases of blank surface sulfide size, improves cutting ability and the surface smoothness on finished product wire rod top layer.
Sulfide diameter and speed of cooling are inversely proportional to, two cold-zone specific waters are controlled to 0.7～0.9L/kg, adopt low speed of cooling can significantly improve the size of sulfide, thereby improve the cutting ability of finished product wire rod, and the too low meeting of cooling intensity causes bleed-out, affect production efficiency.
Start rolling temperature is 1100～1130 ℃, and finishing temperature is 1050～1120 ℃, and in this temperature range, the relative plasticity of MnS is lower, is out of shape littlely in the operation of rolling, makes the MnS in finished product wire rod be fusiform.
In free-cutting steel, a large amount of Mn combine with S and generate MnS, the Mn being solid-solubilized in matrix is less, causes its hardening capacity very low, adopts the speed of cooling of 0.5～1.5K/s can not only form ferrite+pearlitic structure, can also make the hardness of As rolled wire rod in suitable scope, thereby be conducive to machining.
The invention has the advantages that:
(1) in the free-cutting steel that the present invention smelts, not containing Pb element, reduce the pollution to environment, without adding other alloying elements, saved cost;
(2), in the situation that not changing original working condition, by controlling oxygen content in steel, continuous casting process for cooling and hot-rolled heating technology, make steel medium sulphide content be large-sized spindle form;
(3) the free-cutting steel Medium pearlite content that adopts the present invention to produce is 4～7%, and Brinell hardness is 120～130, and hardness is moderate;
(4) the free-cutting steel medium sulphide content mean diameter>=3 μ m that adopts the present invention to produce, unit surface number>=1000/mm
2, area accounting>=1.1%, the sulfide of long-width ratio>=10 accounts for below 25%;
(5) the free-cutting steel machinability that adopts the present invention to produce is excellent, and the piece surface being processed into is highly polished, is applicable to producing in enormous quantities.
Accompanying drawing explanation
Fig. 1 is the aspect graph of free-cutting steel strand medium sulphide content of the present invention;
Fig. 2 is the metallographic structure figure of free-cutting steel wire rod of the present invention;
Fig. 3 is the aspect graph of free-cutting steel wire rod medium sulphide content of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Embodiment 1
The production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence provided by the invention, the steps include:
(1) eaf tapping point carbon content is 0.05%, and tapping temperature is 1625 ℃.Slag tapping is stayed in employing, adds according to the order of sequence 230kg silicomanganese, 1500kg low carbon ferromanganese, 1000kg sulfurous iron ore, 180kg kakoxene to carry out alloying in tapping process, adds the special-purpose synthetic slag of 700kg and the slag making of 100kg lime.
(2) in refining slag, TFe content is 4%, and the refining later stage feeds 80 meters of sulphur cored-wires in stove.Before tapping, in molten steel, free oxygen level is 70ppm, and tapping liquid steel temperature is 1570 ℃.
(3) continuous casting adopts free-cutting steel mould flux, and crystallizer discharge is 1800L/min, and two cold-zones adopt spray cooling, and specific water is 0.9L/kg, and pulling rate is 2.5m/min.
(4) furnace temp is 1250 ℃, insulation 1h.Start rolling temperature is 1120 ℃, and finishing temperature is 1055 ℃, and stelmo line speed of cooling is 0.8K/s.
Embodiment 2
The production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence provided by the invention, the steps include:
(1) eaf tapping point carbon content is 0.05%, and tapping temperature is 1620 ℃.Slag tapping is stayed in employing, adds according to the order of sequence 220kg silicomanganese, 1500kg low carbon ferromanganese, 1100kg sulfurous iron ore, 200kg kakoxene to carry out alloying in tapping process, adds the special-purpose synthetic slag of 700kg and the slag making of 120kg lime.
(2) in refining slag, TFe content is 4%, and the refining later stage feeds 100 meters of sulphur cored-wires in stove.Before tapping, in molten steel, free oxygen level is 90ppm, and tapping liquid steel temperature is 1570 ℃.
(3) continuous casting adopts free-cutting steel mould flux, and crystallizer discharge is 1750L/min, and two cold-zones adopt spray cooling, and specific water is 0.8L/kg, and pulling rate is 2.4m/min.
(4) furnace temp is 1240 ℃, insulation 1h, and start rolling temperature is 1110 ℃, and finishing temperature is 1050 ℃, and stelmo line speed of cooling is 0.7K/s.
Embodiment 3
The production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence provided by the invention, the steps include:
(1) eaf tapping point carbon content is 0.04%, and tapping temperature is 1630 ℃.Slag tapping is stayed in employing, adds according to the order of sequence 220kg silicomanganese, 1500kg low carbon ferromanganese, 1000kg sulfurous iron ore, 180kg kakoxene to carry out alloying in tapping process, adds the special-purpose synthetic slag of 700kg and the slag making of 100kg lime.
(2) in refining slag, TFe content is 4%, and the refining later stage feeds 100 meters of sulphur cored-wires in stove.Before tapping, in molten steel, free oxygen level is 60ppm, and tapping liquid steel temperature is 1570 ℃.
(3) continuous casting adopts free-cutting steel mould flux, and crystallizer discharge is 1750L/min, and two cold-zones adopt spray cooling, and specific water is 0.8L/kg, and pulling rate is 2.4m/min.
(4) furnace temp is 1250 ℃, insulation 0.8h.Start rolling temperature is 1120 ℃, and finishing temperature is 1060 ℃, and stelmo line speed of cooling is 0.7K/s.
The chemical composition (wt.%) of table 1 free-cutting steel embodiment
| Embodiment | C | Si | Mn | P | S | O |
| 1 | 0.072 | 0.006 | 1.290 | 0.053 | 0.361 | 0.016 |
| 2 | 0.070 | 0.007 | 1.292 | 0.051 | 0.378 | 0.020 |
| 3 | 0.067 | 0.005 | 1.303 | 0.052 | 0.372 | 0.015 |
The performance of table 2 free-cutting steel embodiment
Claims (5)
1. a production method for the low carbon high sulfur free-cutting steel of oxide morphology excellence, is characterized in that, its production stage is:
(1) eaf tapping point carbon content control is 0.03～0.05%, and tapping temperature is 1610～1640 ℃; Slag tapping is stayed in employing, adds according to the order of sequence 1.5～2.5kg/t silicomanganese, 10～15kg/t low carbon ferromanganese, 10～13kg/t sulfurous iron ore, 1～2kg/t kakoxene to carry out alloying in tapping process, adds the special-purpose synthetic slag of 6～8kg/t and the slag making of 1～2kg/t lime;
(2) in refining slag, TFe content is 3～5%, and the refining later stage feeds 80～100 meters of sulphur cored-wires in molten steel; Before tapping, in molten steel, free Control for Oxygen Content is at 50～100ppm, and tapping liquid steel temperature is 1560～1590 ℃;
(3) continuous casting adopts free-cutting steel mould flux, and crystallizer discharge is 1700～1900L/min, and two cold-zones adopt spray cooling, and specific water is 0.7～0.9L/kg, and pulling rate is 2.0～2.6m/min;
(4) furnace temp is 1230～1280 ℃, insulation 0.5～1.5h; Start rolling temperature is 1100～1130 ℃, and finishing temperature is 1050～1120 ℃, and stelmo line speed of cooling is 0.5～1.5K/s.
2. the production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence as claimed in claim 1, is characterized in that: the total oxygen content of tundish finished product sample is controlled at 150～200ppm.
3. the production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence as claimed in claim 1, is characterized in that: strand is of a size of 140mm * 140mm.
4. the production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence as claimed in claim 1, is characterized in that: the Brinell hardness of As rolled wire rod is 120～130.
5. the production method of the low carbon high sulfur free-cutting steel of a kind of oxide morphology excellence as claimed in claim 1, is characterized in that: the As rolled wire rod medium sulphide content of production has following character: mean diameter>=3 μ m, unit surface number>=1000/mm
2, area accounting>=1.1%, the sulfide of long-width ratio>=10 accounts for below 25%.
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| CN105234170A (en) * | 2015-11-02 | 2016-01-13 | 江苏省沙钢钢铁研究院有限公司 | Large-specification free-cutting steel rolling method |
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| CN110616385A (en) * | 2018-06-20 | 2019-12-27 | 无锡市东明冠特种金属制造有限公司 | Wear-resistant and heat-resistant steel and preparation method thereof |
| CN110129516A (en) * | 2019-06-11 | 2019-08-16 | 南京钢铁股份有限公司 | A kind of method of oxide morphology in control low carbon high sulfur free-cutting steel |
| CN110722119A (en) * | 2019-10-25 | 2020-01-24 | 广东韶钢松山股份有限公司 | Continuous casting production process for preparing low-carbon high-sulfur high-oxygen free-cutting steel at high drawing speed |
| CN110722119B (en) * | 2019-10-25 | 2021-12-07 | 广东韶钢松山股份有限公司 | Continuous casting production process for preparing low-carbon high-sulfur high-oxygen free-cutting steel at high drawing speed |
| WO2021201178A1 (en) * | 2020-03-31 | 2021-10-07 | Ｊｆｅスチール株式会社 | Free-cutting steel and method for manufacturing same |
| WO2021201179A1 (en) * | 2020-03-31 | 2021-10-07 | Ｊｆｅスチール株式会社 | Free-cutting steel and method for manufacturing same |
| JP7024922B1 (en) * | 2020-03-31 | 2022-02-24 | Ｊｆｅスチール株式会社 | Free-cutting steel and its manufacturing method |
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| CN115362278B (en) * | 2020-03-31 | 2024-02-27 | 杰富意钢铁株式会社 | Free-cutting steel and method for producing same |
| CN115349026B (en) * | 2020-03-31 | 2024-03-12 | 杰富意钢铁株式会社 | Free-cutting steel and method for producing same |
| CN112239832A (en) * | 2020-10-21 | 2021-01-19 | 广东韶钢松山股份有限公司 | Method for improving surface quality of free-cutting steel |
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