CN106480359A - A kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method - Google Patents
A kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method Download PDFInfo
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- CN106480359A CN106480359A CN201510548160.4A CN201510548160A CN106480359A CN 106480359 A CN106480359 A CN 106480359A CN 201510548160 A CN201510548160 A CN 201510548160A CN 106480359 A CN106480359 A CN 106480359A
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Abstract
The present invention provides a kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method, and wire rod composition is as follows by weight percentage：C 0.79%～0.83%, Mn 0.45%～0.60%, Si 0.15%～0.30%, P≤0.015%, S 0.0050%～0.015%, O 0.0020%～0.0030%.Described inexpensive Wire Rod Steel for Curtain String Purpose nitrogen content control method, including converter smelting-LF refining-bloom continuous casting-tandem rolling-wire rod rolling, converter smelting endpoint C content controls in 0.45%-0.62%.LF refining：Cord steel carburetting process carburant nitrogen content 0.02%-0.1%, Al content 0.01%-0.05% in carburant；Refining process top basicity of slag 1.0-1.5, adds according to 2kg/t-2.5kg/t addition.High-carbon steel wire rod Control of Nitrogen Content to no more than 0.0030% level, ton steel cost only can be increased by 10 yuan using the method that the present invention provides.
Description
Technical field
The invention belongs to high-carbon steel wire rod field, more particularly, to a kind of low cost Wire Rod Steel for Curtain String Purpose and
Its nitrogen content control method.
Background technology
With the continuous development of automobile minimizing, the dimensions of steel cord is required increasingly
Height, steel cord structure is more diversified, and monofilament is complicated in steel cord preparation process stress.In order to
Producing thin specification wire of steel wire tire cord needs Wire Rod Steel for Curtain String Purpose to have excellent drawing property, and this is to wire rod
Quality proposes strict demand.Wire Rod Steel for Curtain String Purpose nitrogen content is an important measurement of wire rod quality
Index, relatively low nitrogen content reduces the work hardening rate of steel wire drawing process, improves the cold of wire rod
Processing characteristics.
《A kind of production method of 510L automotive frame black rust steel》(application number：
CN201110031827.5) " disclose a kind of smelting for controlling content of nitrogen in low-carbon steel
Method, belongs to steelmaking technical field.Process characteristic is：Control converter smelting quantity of slag 60kg/t
Steel -120kg/t steel, basicity 5-7；Circular jet tapping, strong deoxidation of tapping, Ladle Bottom is gone in tapping
Portion adds slag charge；Ensure that LF stove arrives at a station temperature, heat time heating time of LF stove refining controlling
1min-15min, reduces nitrogen pick-up；RH application of vacuum controls at the flow of lifting argon, vacuum
Reason time >=10min and vacuum≤1mbar, application of vacuum terminates uniformly to spread guarantor to ladle surface
Warm agent；Adopt bicyclic slotted liner and 3mm-7mm packing ring in casting cycle, seal protection using argon,
Add coverture to molten steel face, in whole casting cycle, ensure molten steel face coverage effect.This invention
Advantage：Can successfully by the nitrogen content of high-level mild steel can control 30ppm with
Interior, it is that the exploitation of high-level steel grade provides technical guarantee so that the performance of continuous casting billet and steel plate
It is greatly improved.It is disadvantageous in that, only describe mild steel nitrogen content control method,
And adopt RH application of vacuum method, increase refining cost 40-60 yuan/ton of steel.In order to produce
High-quality Wire Rod Steel for Curtain String Purpose is badly in need of the side of nitrogen content in a kind of reduction cord steel of low cost of exploitation
Method, meets the demand for development of automobile minimizing.
Content of the invention
It is an object of the invention to overcoming the problems referred to above and deficiency and providing a kind of curtain of low cost
Line steel wire rod and its nitrogen content control method, to meet wire of steel wire tire cord to wire rod cold-forming property
Require.
The object of the present invention is achieved like this：
For the Wire Rod Steel for Curtain String Purpose nitrogen content control method of developing low-cost, the present invention is in wire rod
Study point and refinery practice aspect has carried out Comprehensive Designing, contained by suitable control C, S and O
Amount, mitigates the tendency in refining process adsorption of nitrogen for the Wire Rod Steel for Curtain String Purpose；Cord steel converter smelting adopts
Tapping steel with high carbon technique, mitigates the carburetting burden in furnace rear for the molten steel；Adopt in cord steel carburetting process
Special low nitrogen content carburant, mitigates molten steel nitrogen pick-up, provides suitable before mechanical descaling for wire rod
When protection.
A kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method are it is characterised in that be somebody's turn to do
The composition of steel plate is as follows by weight percentage：C 0.79%～0.83%, Mn 0.45%～
0.60%, Si 0.15%～0.30%, P≤0.015%, S 0.0050%～0.015%, O
0.0020%～0.0030%.
Wire rod composition design reason of the present invention is as follows：
Carbon is the main intensified element in steel, and carbon content is higher, the tensile strength of wire rod and steel wire
Higher.Carbon content in steel is higher, and after refine adjusting component, the oxygen activity of molten steel is lower.Oxygen
, as surface active element, its content is lower for element, will be unfavorable for reducing nitrogen content control in molten steel
System.Therefore, control angle from nitrogen content in liquid steel, should be by carbon content control in steel to relatively low numerical value.
But if in steel, carbon content is too low will can not meet the intensity requirement of high strength cord steel wire.Base
In above-mentioned reason, by wire rod carbon content control 0.79%～0.83%.
Manganese be also a kind of improve wire rod intensity element, manganese element process of setting segregation more
Seriously, therefore in steel, manganese content controls 0.45%～0.60%.
Silicon is the main deoxidant element of high-carbon steel wire rod smelting process.Silicone content is low will to lead to molten steel
Deoxidation is not enough；But, it is thick that too high silicone content leads to residual oxide in steel to be mingled with, to steel
Application performance unfavorable.Therefore, in steel, silicone content controls 0.15%～0.30%.
Phosphorus sulfur is all objectionable impurities elements in steel, and its content can not be too high, otherwise will deteriorate it cold
Pull out performance, do not meet the cold-drawn processing request of fine steel wire.Suitable element sulphur is contained in steel,
Molten steel can be reduced and inhale nitrogen tendency in composition adjustment process, reduce the nitrogen content of Wire Rod Steel for Curtain String Purpose.
Therefore, in steel, phosphorus content controls≤0.015%, and sulfur content controls 0.0050%～0.015%.
Oxygen is also one of wire rod important element, and too high oxygen content will reduce the cold of wire rod
Pull out performance；Too low oxygen content, is also unfavorable for that oxide in steel is mingled with the control of morphotropism.Cause
This, oxygen content in steel controls 0.0020%～0.0030%.
A kind of low cost Wire Rod Steel for Curtain String Purpose nitrogen content control method, including converter smelting-LF
Refine-bloom continuous casting-tandem rolling-wire rod rolling；
(1) converter smelting：In converter smelting endpoint, the carbon content of molten steel is too high, will lead to
Nitrogen content in liquid steel is of a relatively high.Conversely, the carbon content of steel is too low, its nitrogen content is low.But
Furnace rear carburetting process, also results in a large amount of nitrogen pick-up of molten steel.Accordingly, converter smelting endpoint C contains
Amount controls in 0.45%-0.62%；
(2) LF refining：Nitrogen content 0.02%-0.1% in cord steel carburetting process carburant,
Al content 0.01%-0.05% in carburant；Common carburant nitrogen content is of a relatively high, unfavorable
Control in nitrogen in steel content；Also unsuitable too low, this carburetting of nitrogen content in low nitrogen carburant
Agent is higher due to purity, needs longer fusing time, is unfavorable for the stable control of molten steel carbon content
System.
Adopt the top slag of lower basicity in cord steel refining process, make the oxide in steel be mingled with tool
There is good morphotropism.The basicity of molten steel to be prevented is too high, leads to molten steel oxygen activity too low, makes
Molten steel nitrogen pick-up quantity is become to increase.Cord steel refining process top basicity of slag 1.0-1.5, according to
2kg/t-2.5kg/t addition adds, and prevents that the quantity of slag is too low to lead to absorption of nitrogen by steel.
The beneficial effects of the present invention is：Reduce nitrogen content with traditional employing application of vacuum mode
Method compares, and can be arrived high-carbon steel wire rod Control of Nitrogen Content using the method that the present invention provides
It is not more than 0.0030% level, ton steel cost only increases by 10 yuan, and meets the fine of user
The processing characteristics of wire of steel wire tire cord requires.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention, according to the component proportion of technical scheme, carries out converter smelting-LF refining
- bloom continuous casting-tandem rolling-wire rod rolling.The composition of embodiment of the present invention wire rod is shown in Table 1.This
The main technologic parameters of bright embodiment wire rod are shown in Table 2.The performance of embodiment of the present invention wire rod is shown in Table
3.
The composition (wt%) of table 1 embodiment of the present invention wire rod
| Embodiment | C | Si | Mn | P | S | O | N |
| 1 | 0.79 | 0.16 | 0.46 | 0.0071 | 0.0067 | 0.0021 | 0.0025 |
| 2 | 0.81 | 0.20 | 0.50 | 0.013 | 0.0079 | 0.0025 | 0.0021 |
| 3 | 0.82 | 0.28 | 0.52 | 0.011 | 0.013 | 0.0029 | 0.0017 |
The main technologic parameters of table 2 embodiment of the present invention wire rod
The performance of table 3 embodiment of the present invention wire rod
| Embodiment | Wire rod size, mm | Wire drawing diameter, mm | Wire broken rate, secondary/ton |
| 1 | 5.5 | 0.20 | 0.3 |
| 2 | 5.5 | 0.18 | 0.5 |
| 3 | 5.5 | 0.22 | 0.1 |
Claims (2)
1. a kind of low cost Wire Rod Steel for Curtain String Purpose is it is characterised in that the composition percentage by weight of this wire rod
As follows than counting：C 0.79%～0.83%, Mn 0.45%～0.60%, Si 0.15%～0.30%,
P≤0.015%, S 0.0050%～0.015%, O 0.0020%～0.0030%.
2. the inexpensive Wire Rod Steel for Curtain String Purpose nitrogen content control method described in a kind of claim 1, including turn
Stove smelting-LF refining-bloom continuous casting-tandem rolling-wire rod rolling it is characterised in that：
(1) converter smelting：Converter smelting endpoint C content controls in 0.45%-0.62%.
(2) LF refining：Cord steel carburetting process carburant nitrogen content 0.02%-0.1%, increases
Al content 0.01%-0.05% in carbon agent；Refining process top basicity of slag 1.0-1.5, according to
2kg/t-2.5kg/t addition adds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510548160.4A CN106480359A (en) | 2015-08-31 | 2015-08-31 | A kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510548160.4A CN106480359A (en) | 2015-08-31 | 2015-08-31 | A kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method |
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| Publication Number | Publication Date |
|---|---|
| CN106480359A true CN106480359A (en) | 2017-03-08 |
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|---|---|---|---|
| CN201510548160.4A Pending CN106480359A (en) | 2015-08-31 | 2015-08-31 | A kind of low cost Wire Rod Steel for Curtain String Purpose and its nitrogen content control method |
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|---|---|---|---|---|
| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN102019392A (en) * | 2009-09-15 | 2011-04-20 | 鞍钢股份有限公司 | Process for smelting and continuously casting boron-containing high carbon steel for wire production |
| CN102031447A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Boron-containing high carbon steel wire rod for manufacturing wires and production method thereof |
| CN102952997A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Wire rod for steel cord and its Al2O3 inclusion control method |
| CN103667581A (en) * | 2013-11-22 | 2014-03-26 | 首钢水城钢铁（集团）有限责任公司 | Low-nitrogen SWR82B steel smelting method |
| CN103882306A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Steel wire rod for finely cut steel wire and production method thereof |
| CN104451413A (en) * | 2014-12-19 | 2015-03-25 | 重庆钢铁股份有限公司 | Hard wire steel wire rod |
-
2015
- 2015-08-31 CN CN201510548160.4A patent/CN106480359A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN102019392A (en) * | 2009-09-15 | 2011-04-20 | 鞍钢股份有限公司 | Process for smelting and continuously casting boron-containing high carbon steel for wire production |
| CN102031447A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Boron-containing high carbon steel wire rod for manufacturing wires and production method thereof |
| CN102952997A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Wire rod for steel cord and its Al2O3 inclusion control method |
| CN103882306A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Steel wire rod for finely cut steel wire and production method thereof |
| CN103667581A (en) * | 2013-11-22 | 2014-03-26 | 首钢水城钢铁（集团）有限责任公司 | Low-nitrogen SWR82B steel smelting method |
| CN104451413A (en) * | 2014-12-19 | 2015-03-25 | 重庆钢铁股份有限公司 | Hard wire steel wire rod |
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Application publication date: 20170308 |