CN101368225A - Smelting method for vulcanization easy cutting plastic mold steel - Google Patents
Smelting method for vulcanization easy cutting plastic mold steel Download PDFInfo
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- CN101368225A CN101368225A CNA2008101414973A CN200810141497A CN101368225A CN 101368225 A CN101368225 A CN 101368225A CN A2008101414973 A CNA2008101414973 A CN A2008101414973A CN 200810141497 A CN200810141497 A CN 200810141497A CN 101368225 A CN101368225 A CN 101368225A
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Abstract
The invention provides a smelting method for plastic die steel which is added with sulphur and easily cut; the materials after being smelted by an electric furnace is fed into a refining process; the content of the sulphur in the molten steel is controlled less than 0.005 percent during the refining process; the weight percentage of the steel slag in the molten steel is adjusted between 0.8 and 1.2 percent through slagging off; then the molten steel is fed into a vacuum furnace; an aluminum wire is fed into the molten steel; the weight of the fed aluminum wire is 0.08 to 0.10 percent of the weight of the molten steel; then the steel slag is added; the weight percentage of the steel slag in the molten steel is adjusted between 1.5 to 2 percent; then the molten steel is maintained for 15 to 30 minutes under the pressure of 60 to 70Pa; then the vacuum is released; a sulfurous iron wires are fed in and a calcium silicon block is added to finish smelting. In the invention, the occluded foreignsubstance in the molten steel can be mostly removed; the purify of the molten steel is improved to a large extent; the molten steel smelt after the invention can obtain the plastic die steel which is added with sulphur and easily cut through casting; the inspection grade of the die steel accords with requirments through detection; each property is further improved.
Description
Technical field
The invention belongs to technical field of smelting, relate to a kind of smelting process of vulcanization easy cutting plastic mold steel.
Background technology
Free-cutting steel is owing to have good free-cutting machinability, the surface smoothness height, and the dimensional precision height is widely used in many fields such as household electrical appliance, instrument and meter industry, and present stage, mass-produced free-cutting steel was mainly sulphur free-cutting steel.Sulphur in the sulphur free-cutting steel forms the manganese sulfide inclusion thing with manganese and iron in steel, this class fusiform sulfide can interrupt the continuity of matrix metal, and the short volume of the minor radius of impelling chip breaking formation to be easy to get rid of during cutting reduces the contact area between cutter and chip breaking; Can also play the internal lubrication effect, reduce friction, make unlikely the sticking to of chip breaking form built-up-edge on the blade, thereby reduce cutting force and heat in metal cutting, reduce tool wear, improve processed surface smoothness and cutter life.Usually the machinability of steel is with the increasing and improve of sulphur content, and promptly under the condition in same life-span of cutter, sulphur content is high more, and cutting speed is high more.But sulphur content is too high, then can cause red brittleness, causes difficulty for the hot-work of steel, influences the mechanical property of steel, has particularly reduced the transverse mechanical performance of steel, as horizontal plasticity and toughness and fatigue property.Usually sulphur content is 0.08～0.30%, can reach 0.40% sometimes; Sulphur content in free-cutting tool steel and the stainless steel all should be between 0.06～0.10%.
At present, smelting in the vulcanization easy cutting die steel production process is mainly adopted at refining process and is made neutral slag and add sulphur iron, the sulphur content that makes steel grade just reaches the composition requirement of steel grade at refining process, because the sweetening power of slag is not strong, can guarantee the rate of recovery of sulphur in the molten steel at vacuum process.But the main drawback that this smelting process exists is: because the adsorptive power of slag is not strong, also to guarantee the rate of recovery of sulphur, cause the inclusion in the molten steel maximumly not remove, the purity of molten steel can not guarantee, cause the flaw detection rank of steel plate not reach requirement easily, the various performances of steel plate are all had certain influence.
Summary of the invention
The purpose of this invention is to provide a kind of smelting process that significantly improves the vulcanization easy cutting plastic mold steel of molten steel purity.
For achieving the above object, the present invention is by the following technical solutions: the smelting process of vulcanization easy cutting plastic mold steel, raw material is sent into refining process behind electrosmelting, sulphur content is below 0.005% in the refining process control molten steel, and the shared weight percent of slag is 0.8～1.2% in the adjustment molten steel of skimming; Send into vacuum oven then, in molten steel, feed aluminum steel, the aluminum steel weight of feeding is 0.08～0.10% of molten steel weight, adds slag again, and the shared weight percent of slag is 1.5～2% in the adjustment molten steel, under the pressure of 60～70Pa, kept 15～30 minutes then, remove vacuum then, feeding sulphur iron wire, adjusting sulphur content is 0.09～0.125%, add the silico-calcium piece again, finish smelting.
The adding weight of described silico-calcium piece is 0.1～0.2% of molten steel weight.
Under the pressure of 60～70Pa, kept 3～5 minutes after adding the silico-calcium piece.
Smelting process in described refining process and the vacuum oven is led to argon gas.
Smelting process of the present invention has improved molten steel purity greatly, thereby the performance of steel plate is significantly improved.Control sulphur content when refining, feeding aluminum steel and slag are strengthened vacuum effectiveness, guarantee that gas and the inclusion in deoxidation and the steel can maximumly be removed; The inclusion that adding silico-calcium piece is brought the sulphur iron wire into can be out of shape, and feeds argon gas and makes the composition in the molten steel even, and make the inclusion floating after the distortion so that remove inclusion, and argon gas also can prevent secondary oxidation of steel.The present invention can make the inclusion in the molten steel obtain the removal of maximum, the purity of molten steel increases substantially, the molten steel after the present invention smelts through pour into a mould vulcanization easy cutting plastic mold steel, after testing, the flaw detection rank of this die steel meets the requirements, and every performance further improves.
Embodiment
Following examples are example with vulcanization easy cutting plastic mold steel WSM2312B, and sulphur content requires to be the 0.050-0.10% of molten steel quality in the steel.
Embodiment 1: the electric furnace batching is 15 tons of 27 tons+sponge iron of the 45 tons+pig iron of heating molten steel, 8 tons+high-quality steel scrap, 48 minutes electrosmelting cycles, tapping [C]: 0.08%, [P]: 0.007%, 1618 ℃ of tapping temperatures, non-oxidation slag in bag during tapping, Argon is normal, send into the refining of LF stove, the deoxidation of the conventional change of refining process slag, refining cycle 55 minutes, 40 minutes white slag hold-times, sulphur content is 0.003% in the control molten steel, and the shared weight percent of slag is 0.8% in the adjustment molten steel of skimming; Send into vacuum oven then, feed aluminum steel in molten steel, the aluminum steel weight of feeding is 0.08% of molten steel weight, add slag again, the shared weight percent of slag is 1.5% in the adjustment molten steel, keeps 30 minutes under the pressure of 60Pa then, removes vacuum then, feeding sulphur iron wire, sulphur content is 0.09% in the adjustment molten steel, adds the silico-calcium piece again, and the add-on of silico-calcium piece is 0.1% of a molten steel weight, under the pressure of 60Pa, kept 5 minutes then, finish smelting.Smelting process in refining process and the vacuum oven is led to argon gas.
The molten steel that smelting finishes gets finished product through continuous casting working procedure again, and sulphur content is 0.075% in the Finished Steel, and the rate of recovery of sulphur is 83%, and the flaw detection message feedback of steel plate is good, and plate property is up to the standards.
Embodiment 2: the electric furnace batching is 15 tons of 27 tons+sponge iron of the 45 tons+pig iron of heating molten steel, 8 tons+high-quality steel scrap, 48 minutes electrosmelting cycles, tapping [C]: 0.08%, [P]: 0.007%, 1618 ℃ of tapping temperatures, non-oxidation slag in bag during tapping, Argon is normal, send into the refining of LF stove, the deoxidation of the conventional change of refining process slag, refining cycle 55 minutes, 40 minutes white slag hold-times, sulphur content is 0.005% in the control molten steel, and the shared weight percent of slag is 1% in the adjustment molten steel of skimming; Send into vacuum oven then, feed aluminum steel in molten steel, the aluminum steel weight of feeding is 0.09% of molten steel weight, add slag again, the shared weight percent of slag is 1.7% in the adjustment molten steel, keeps 20 minutes under the pressure of 65Pa then, removes vacuum then, feeding sulphur iron wire, sulphur content is 0.125% in the adjustment molten steel, adds the silico-calcium piece again, and the add-on of silico-calcium piece is 0.15% of a molten steel weight, under the pressure of 65Pa, kept 4 minutes then, finish smelting.Smelting process in refining process and the vacuum oven is led to argon gas.
The molten steel that smelting finishes gets finished product through continuous casting working procedure again, and sulphur content is 0.1% in the Finished Steel, and the rate of recovery of sulphur is 80%, and the flaw detection message feedback of steel plate is good, and plate property is up to the standards.
Embodiment 3: the electric furnace batching is 15 tons of 27 tons+sponge iron of the 45 tons+pig iron of heating molten steel, 8 tons+high-quality steel scrap, 48 minutes electrosmelting cycles, tapping [C]: 0.08%, [P]: 0.007%, 1618 ℃ of tapping temperatures, non-oxidation slag in bag during tapping, Argon is normal, send into the refining of LF stove, the deoxidation of the conventional change of refining process slag, refining cycle 55 minutes, 40 minutes white slag hold-times, sulphur content is 0.002% in the control molten steel, and the shared weight percent of slag is 1.2% in the adjustment molten steel of skimming; Send into vacuum oven then, feed aluminum steel in molten steel, the aluminum steel weight of feeding is 0.10% of molten steel weight, add slag again, the shared weight percent of slag is 2% in the adjustment molten steel, keeps 15 minutes under the pressure of 70Pa then, removes vacuum then, feeding sulphur iron wire, sulphur content is 0.1% in the adjustment molten steel, adds the silico-calcium piece again, and the add-on of silico-calcium piece is 0.2% of a molten steel weight, under the pressure of 70Pa, kept 3 minutes then, finish smelting.Smelting process in refining process and the vacuum oven is led to argon gas.
The molten steel that smelting finishes gets finished product through continuous casting working procedure again, and sulphur content is 0.083% in the Finished Steel, and the rate of recovery of sulphur is 83%, and the flaw detection message feedback of steel plate is good, and plate property is up to the standards.
Claims (4)
1. the smelting process of vulcanization easy cutting plastic mold steel, raw material is sent into refining process behind electrosmelting, it is characterized in that: sulphur content is below 0.005% in the refining process control molten steel, and the shared weight percent of slag is 0.8～1.2% in the adjustment molten steel of skimming; Send into vacuum oven then, in molten steel, feed aluminum steel, the aluminum steel weight of feeding is 0.08～0.10% of molten steel weight, adds slag again, and the shared weight percent of slag is 1.5～2% in the adjustment molten steel, under the pressure of 60～70Pa, kept 15～30 minutes then, remove vacuum then, feeding sulphur iron wire, adjusting sulphur content is 0.09～0.125%, add the silico-calcium piece again, finish smelting.
2. the smelting process of vulcanization easy cutting plastic mold steel as claimed in claim 1, it is characterized in that: the adding weight of described silico-calcium piece is 0.1～0.2% of molten steel weight.
3. the smelting process of vulcanization easy cutting plastic mold steel as claimed in claim 1 or 2 is characterized in that: kept under the pressure of 60～70Pa 3～5 minutes after adding the silico-calcium piece.
4. the smelting process of vulcanization easy cutting plastic mold steel as claimed in claim 3, it is characterized in that: the smelting process in described refining process and the vacuum oven is led to argon gas.
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| CN2008101414973A CN101368225B (en) | 2008-09-28 | 2008-09-28 | Smelting method for vulcanization easy cutting plastic mold steel |
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| CN2008101414973A CN101368225B (en) | 2008-09-28 | 2008-09-28 | Smelting method for vulcanization easy cutting plastic mold steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643950A (en) * | 2011-02-18 | 2012-08-22 | 北大方正集团有限公司 | Method for smelting sulfur containing steel for vehicle and sulfur containing steel |
| CN103710490A (en) * | 2013-12-17 | 2014-04-09 | 江油市长祥特殊钢制造有限公司 | Method for adding refining denaturant in 3Cr2MnMoS die steel |
| CN104357761A (en) * | 2014-11-12 | 2015-02-18 | 中原特钢股份有限公司 | Sulfur-containing free-cutting die steel smelting technique |
| CN106148844A (en) * | 2016-08-12 | 2016-11-23 | 常州东大中天钢铁研究院有限公司 | A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel |
| CN107760824A (en) * | 2017-09-15 | 2018-03-06 | 上海大学 | The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel |
| CN110373600A (en) * | 2019-07-26 | 2019-10-25 | 石钢京诚装备技术有限公司 | A kind of high alumina sulfur-bearing control calcium steel smelting process |
| CN110616294A (en) * | 2019-10-30 | 2019-12-27 | 广东韶钢松山股份有限公司 | Sulfur-containing aluminum-containing steel, smelting method and application thereof |
| CN113088788A (en) * | 2021-03-03 | 2021-07-09 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234898C (en) * | 2003-06-02 | 2006-01-04 | 莱芜钢铁集团有限公司 | Calcium-sulphur-tin series composite easily machined steel |
| CN1285750C (en) * | 2003-06-09 | 2006-11-22 | 张晓兵 | Self-lubricated free-cutting steel and method for producing same |
-
2008
- 2008-09-28 CN CN2008101414973A patent/CN101368225B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643950A (en) * | 2011-02-18 | 2012-08-22 | 北大方正集团有限公司 | Method for smelting sulfur containing steel for vehicle and sulfur containing steel |
| CN103710490A (en) * | 2013-12-17 | 2014-04-09 | 江油市长祥特殊钢制造有限公司 | Method for adding refining denaturant in 3Cr2MnMoS die steel |
| CN103710490B (en) * | 2013-12-17 | 2016-01-13 | 江油市长祥特殊钢制造有限公司 | 3Cr2MnMoS die steel refining denaturing agent Adding Way |
| CN104357761A (en) * | 2014-11-12 | 2015-02-18 | 中原特钢股份有限公司 | Sulfur-containing free-cutting die steel smelting technique |
| CN104357761B (en) * | 2014-11-12 | 2016-08-24 | 中原特钢股份有限公司 | A kind of sulfur-bearing easily cuts mould steel smelting process |
| CN106148844B (en) * | 2016-08-12 | 2018-07-10 | 常州东大中天钢铁研究院有限公司 | A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel |
| CN106148844A (en) * | 2016-08-12 | 2016-11-23 | 常州东大中天钢铁研究院有限公司 | A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel |
| CN107760824A (en) * | 2017-09-15 | 2018-03-06 | 上海大学 | The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel |
| CN107760824B (en) * | 2017-09-15 | 2019-10-11 | 上海大学 | The smelting process that sulphide inculsion modifies in non-hardened and tempered steel or pinion steel |
| CN110373600A (en) * | 2019-07-26 | 2019-10-25 | 石钢京诚装备技术有限公司 | A kind of high alumina sulfur-bearing control calcium steel smelting process |
| CN110373600B (en) * | 2019-07-26 | 2021-07-09 | 石钢京诚装备技术有限公司 | Smelting process method of high-aluminum sulfur-containing calcium-controlling steel |
| CN110616294A (en) * | 2019-10-30 | 2019-12-27 | 广东韶钢松山股份有限公司 | Sulfur-containing aluminum-containing steel, smelting method and application thereof |
| CN113088788A (en) * | 2021-03-03 | 2021-07-09 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
| CN113088788B (en) * | 2021-03-03 | 2022-03-15 | 武汉科技大学 | Method for reducing harmfulness of aluminum nitride inclusions in high-aluminum steel |
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| CN101368225B (en) | 2010-10-13 |
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