CN1858282A - Low S low Pb forgeable free cutting steel and its producing process - Google Patents
Low S low Pb forgeable free cutting steel and its producing process Download PDFInfo
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- CN1858282A CN1858282A CN 200610051849 CN200610051849A CN1858282A CN 1858282 A CN1858282 A CN 1858282A CN 200610051849 CN200610051849 CN 200610051849 CN 200610051849 A CN200610051849 A CN 200610051849A CN 1858282 A CN1858282 A CN 1858282A
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Abstract
The present invention belongs to the field of metal material, and is especially one kind of forgeable free cutting steel with low S and Pb content and its production process. The forgeable free cutting steel contains (in wt%): C 0.36-0.44, Si 0.17-0.37, Mn 0.80-1.20, As 0.20-0.30, Sn+Pb 0.05-0.20, P not more than 0.040, S not more than 0.060, Cu not more than 0.25 and Fe and impurity for the rest. The production process includes the steps of: smelting in a converter, ladle refining, continuous casting and continuous rolling. The present invention has low production cost, less environmental pollution, high production efficiency and high product quality.
Description
Technical field
The invention belongs to metal material field, particularly relate to a kind of low S low Pb forgeable free cutting steel and production technique thereof.
Background technology
Free-cutting steel is to use day by day energy-saving material widely in the mechanical industry, free-cutting steel is main with sulphur system, sulphur phosphorus system and lead usually both at home and abroad at present, have many technology and economic bottleneck in actual production and use, big, the rolling lumber recovery of difficulty is not high as smelting, malleable poor performance etc.Simultaneously, sulphur, plumbous a large amount of uses have brought serious pollution to environment in process of production, therefore, develop a kind of low S low Pb forgeable free cutting steel and production technique thereof, have become the problem that presses for solution.
Summary of the invention
The object of the present invention is to provide that a kind of production cost is low, environmental pollution is little, production efficiency is high, the low S low Pb forgeable free cutting steel of good product quality and production technique thereof.
Low S low Pb forgeable free cutting steel of the present invention, (wt%) chemical ingredients of containing is C:0.36-0.44, Si:0.17-0.37, Mn:0.80-1.20, As:0.20-0.30, Sn+Pb:0.05-0.20, P by weight :≤0.040, S: 〉=0.060, Cu :≤0.25, and all the other are Fe and impurity; Its production craft step is: converter smelting → ladle refining → continuous casting → rolling.
Low S low Pb forgeable free cutting steel of the present invention has characteristics such as smelting technology lumber recovery height reasonable in design, rolling, malleable performance be good, and the influence that brings to environment in its production process is less, has created certain condition for improving production environment.
Embodiment
Invent described low S low Pb forgeable free cutting steel, (wt%) chemical ingredients of containing is C:0.36-0.44, Si:0.17-0.37, Mn:0.80-1.20, As:0.20-0.30, Sn+Pb:0.05-0.20, P by weight :≤0.040, S: 〉=0.060, Cu :≤0.25, and all the other are Fe and impurity; Its production craft step is: converter smelting → ladle refining → continuous casting → rolling; Concrete steps are as follows:
Converter smelting: be blended into hot metal charge during converter smelting, molten iron accounts for into 85% of stove total amount, and adds a certain amount of As of containing pig iron and other scrap iron and steel material is smelted, and smelting temperature is at 1640-1660 ℃, reaches to meet the molten steel that chemical ingredients requires;
Alloying alloys such as the high-sulfur pig iron of adding metering in advance, lead shot, manganeseirom, ferro-silicon in the converter tapping process, and press 1.5-2.0Kg/t steel adding deoxygenated alloy Al-Mn-Fe, Al-Ca, BaSi; Press the 0.5Kg/t steel and add the modification slag charge, the composition that reaches in the molten steel meets the requirements;
Contain S 48% in the described high-sulfur pig iron; Contain in the lead shot to contain in Pb 99%, the manganeseirom and contain Si 72% in Mn 56%, the ferro-silicon;
Also can adopt in tapping and finish the technology that the method that feeds 150m/ stove lead-sheathing core iron silk or winding-up equivalent lead shot in molten steel replaces adding in the tapping process lead shot.
Ladle refining: adopt the ladle argon-blown refinery practice, molten steel is stirred under the flow of the argon pressure of 0.15-0.20Mpa and 250-300NL/min fully, molten steel purity, uniformity coefficient are improved; Carry out the feeding Ca-Si cored-wire of 4m/t steel simultaneously and make further refining treatment;
Handle the Bi Jinhang chemical composition analysis,, need carry out the chemical ingredients trim process, make suitable cast such as the final temperature of molten steel, chemical ingredients if chemical ingredients does not meet.
Temperature is satisfied the molten steel that pouring technology requires, composition meets design variable pour into continuously cast bloom through continuous casting, wherein in the temperature control, just often the ladle temperature is controlled at 1565-1585 ℃, tundish temperature control: 1515-1535 ℃, and with normally carrying out of guaranteeing to pour into a mould.
Continuous casting: adopt following technical quality control and process optimization in the continuous casting process process: adopt the whole process protection cast, avoid the pollution to steel of secondary oxidation; Adopt the stopper pouring technology, guarantee the steady of casting process, liquid level fluctuation of molten steel is controlled at Δ S:0.1-0.2cm; Pulling rate is controlled by 1.6-1.7m/min; Adopt crystallizer induction stirring technology, its electric current and frequency are respectively 115A, 5HZ; The subsidiary material of in the casting process tundish and crystallizer being used are optimized; The weak cold technology of two cold employings, Total Water is at 150M
3Content such as about/hr guarantees that shape, physical dimension and the inner quality of continuously cast bloom meets the requirements.
Rolling: the strand that continuous casting process is obtained is rolled into finished product by the product specification requirement and gets final product.
Product is carried out every check, can dispatch from the factory after meeting low S low Pb forgeable free cutting steel HG30 mechanical property table specified requirement.
Low S low Pb forgeable free cutting steel HG30 mechanical property table
| Thermal treatment temp ℃ | Yield strength MPa | Tensile strength MPa | Elongation after fracture % | Relative reduction in area % | Hot-rolled state Brinell hardness HBW |
| Normalizing | Be not less than | Be not less than | Be not less than | Be not less than | Be not more than |
| 850 | 355 | 600 | 16 | 40 | 229 |
Claims (4)
1, low S low Pb forgeable free cutting steel, (wt%) chemical ingredients of containing is C:0.36-0.44, Si:0.17-0.37, Mn:0.80-1.20, As:0.20-0.30, Sn+Pb:0.05-0.20, P by weight :≤0.040, S: 〉=0.060, Cu :≤0.25, and all the other are Fe and impurity; Its production craft step is: converter smelting → ladle refining → continuous casting → rolling.
2, the production craft step of low S low Pb forgeable free cutting steel according to claim 1 is: converter smelting → ladle refining → continuous casting → rolling, and concrete steps are as follows:
Converter smelting: be blended into hot metal charge during converter smelting, molten iron accounts for into 85% of stove total amount, and adds a certain amount of As of containing pig iron and other scrap iron and steel material is smelted, and smelting temperature is at 1640-1660 ℃, reaches to meet the molten steel that chemical ingredients requires; Alloying alloys such as the high-sulfur pig iron of adding metering in advance, lead shot, manganeseirom, ferro-silicon in the converter tapping process, and press 1.5-2.0Kg/t steel adding deoxygenated alloy Al-Mn-Fe, Al-Ca, BaSi; Press the 0.5Kg/t steel and add the modification slag charge, the composition that reaches in the molten steel meets the requirements;
Ladle refining: adopt the ladle argon-blown refinery practice, molten steel is stirred under the flow of the argon pressure of 0.15-0.20Mpa and 250-300NL/min fully, molten steel purity, uniformity coefficient are improved; Carry out the feeding Ca-Si cored-wire of 4m/t steel simultaneously and make further refining treatment;
Handle the Bi Jinhang chemical composition analysis,, need carry out the chemical ingredients trim process, make suitable cast such as the final temperature of molten steel, chemical ingredients if chemical ingredients does not meet;
Temperature is satisfied the molten steel that pouring technology requires, composition meets design variable pour into continuously cast bloom through continuous casting, wherein in the temperature control, just often the ladle temperature is controlled at 1565-1585 ℃, tundish temperature control: 1515-1535 ℃, with normally carrying out of guaranteeing to pour into a mould;
Continuous casting: adopt following technical quality control and process optimization in the continuous casting process process: adopt the whole process protection cast, avoid the pollution to steel of secondary oxidation; Adopt the stopper pouring technology, guarantee the steady of casting process, liquid level fluctuation of molten steel is controlled at Δ S:0.1-0.2cm; Pulling rate is controlled by 1.6-1.7m/min; Adopt crystallizer induction stirring technology, its electric current and frequency are respectively 115A, 5HZ; The subsidiary material of in the casting process tundish and crystallizer being used are optimized; The weak cold technology of two cold employings, Total Water is at 150M
3Content such as about/hr guarantees that shape, physical dimension and the inner quality of continuously cast bloom meets the requirements.
Rolling: the strand that continuous casting process is obtained is rolled into finished product by the product specification requirement and gets final product.
3, the production technique of low S low Pb forgeable free cutting steel according to claim 2 is characterized in that containing in the described high-sulfur pig iron S 48%; Contain in the lead shot to contain in Pb 99%, the manganeseirom and contain Si 72% in Mn 56%, the ferro-silicon.
4, the production technique of low S low Pb forgeable free cutting steel according to claim 2 is characterized in that the technology that adds lead shot in the described tapping process also can adopt in the complete mode that feeds 150m/ stove lead-sheathing core iron silk or winding-up equivalent lead shot in molten steel of tapping.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100518497A CN1858282B (en) | 2006-06-07 | 2006-06-07 | Low S low Pb forgeable free cutting steel and its producing process |
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| CN2006100518497A CN1858282B (en) | 2006-06-07 | 2006-06-07 | Low S low Pb forgeable free cutting steel and its producing process |
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| CN1858282A true CN1858282A (en) | 2006-11-08 |
| CN1858282B CN1858282B (en) | 2010-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925806A (en) * | 2012-12-01 | 2013-02-13 | 新余钢铁集团有限公司 | Y55 mark free-cutting steel plate and manufacture method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102321856B (en) * | 2011-09-22 | 2016-06-01 | 首钢贵阳特殊钢有限责任公司 | A kind of high-quality structural steel improving cutting ability and production technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1060223C (en) * | 1998-01-23 | 2001-01-03 | 陈刚 | Iron-base powder-metallurgy anti-friction structural material and preparation method therefor |
| JP2005054216A (en) * | 2003-08-08 | 2005-03-03 | Jfe Steel Kk | Steel material superior in machinability and fatigue characteristics, and manufacturing method therefor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925806A (en) * | 2012-12-01 | 2013-02-13 | 新余钢铁集团有限公司 | Y55 mark free-cutting steel plate and manufacture method thereof |
| CN102925806B (en) * | 2012-12-01 | 2014-12-31 | 新余钢铁集团有限公司 | Y55 mark free-cutting steel plate and manufacture method thereof |
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| CN1858282B (en) | 2010-09-01 |
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