CN101381803B - Control method of toothed wheel steel band structure - Google Patents
Control method of toothed wheel steel band structure Download PDFInfo
- Publication number
- CN101381803B CN101381803B CN2008102237961A CN200810223796A CN101381803B CN 101381803 B CN101381803 B CN 101381803B CN 2008102237961 A CN2008102237961 A CN 2008102237961A CN 200810223796 A CN200810223796 A CN 200810223796A CN 101381803 B CN101381803 B CN 101381803B
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- steel
- pinion
- refining
- furnace
- rolling
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000007670 refining Methods 0.000 claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 10
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 235000019362 perlite Nutrition 0.000 claims description 9
- 239000010451 perlite Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910001562 pearlite Inorganic materials 0.000 abstract 1
- 238000012797 qualification Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 238000009847 ladle furnace Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for controlling a strip tissue of pinion steel, which belongs to the technical field of the tissue of the pinion steel. The method adopts the following process flow for producing a continuous casting billet of the pinion steel: the pretreatment of molten iron, primary smelting in a converter, refining in a ladle refining furnace or refining in the ladle refining furnace and a vacuum degassing furnace, and continuous casting; the steel billet is heated and is subjected to continuous rolling through 20 short stress line high-rigidity closed-type red ring rolling machines; and different final rolling temperatures are respectively controlled to produce a hot-rolled round steel bar material in order that the level of a steel ferrite and pearlite strip tissue is less than or equal to 2.5. The method has the advantages that different specifications and different final rolling temperatures of the rolled steel are controlled by cooling and other means to realize the aim of enlightening the level of the strip tissue by the steel material with Phi of between 14 and 80 mm<2>. By effectively controlling the level of the strip tissue, the method can meet the requirement of a user on the high-quality pinion steel and improve the qualification rate of the quality of the high-quality pinion steel.
Description
Affiliated field
The invention belongs to Pinion Steel organizational controls technical field, a kind of control method of toothed wheel steel band structure particularly is provided, be applicable to that the control of banded structure appears in the hot rolling Pinion Steel.
Background technology
Gear is the important drive disk assembly of automobile and machinery manufacturing industry.Pinion Steel is a critical material of making transmission system middle gear, bar and gear shafts such as automobile, machinery, and specification of quality is extremely strict.Remove require steel to have higher purity, enough heart portion hardening capacity and good infiltration layer hardening capacity, 6-8 level austenite crystals are outside one's consideration, and also hot-strip are proposed the requirement of banded structure≤3 grade.
Toothed wheel steel band structure is meant along what the Steel Rolling direction formed and piles up the tissue morphology that forms each other based on the band of proeutectoid ferrite and based on the band of perlite.The existence of banded structure makes the mechanical property of material have tangible directivity, directly influence the machinability of material, cause the hardness and the intensity at tooth surface and tooth root position inhomogeneous easily after making gear, reduce reliability, security and the work-ing life of gear.
To contain existing of the same banded structure of Mn steel commonplace with other for Pinion Steel, be subjected to the influence of chemical ingredients, smelting and continuous casting process, steel billet easily produces dendritic segregation, it is the root that banded structure appears in the later stage steel, it is extremely difficult to eliminate dendritic segregation by steel-making and continuous casting process, steel billet is one of problem that influences the pinion steel for vehicles quality through the rolling ferrite+perlite banded structure that very easily occurs in various degree for many years always, also is the important indicator that automobile factory pays special attention to.Be accompanied by the fast development of automotive industry, the increasing sharply of Chinese Pinion Steel demand, 2007 annual production reach 2,100,000 tons, the method for research control banded structure, the rank of pinion steel band shape tissue has great importance for raising Pinion Steel quality.
Summary of the invention
The object of the present invention is to provide a kind of control method of toothed wheel steel band structure, exactly by controlling the control of different rolling technologys and parameter and alleviating the toothed wheel steel band structure rank.
The present invention adopts hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom, steel billet heating back is rolling in 1000 ℃～1100 ℃ beginnings, by 20 closed red circle milling train continuous rollings of short-stress path high strength, control finishing temperature respectively and produce Φ 14mm in 750 ℃～880 ℃ scopes or 910 ℃～950 ℃ scopes
2～Φ 70mm
2Hot rolled circular steel can make steel ferrite+perlite banded structure rank≤2.5 grades.Adopt aforesaid method to give prominence to bof process and smelt Pinion Steel, can effectively control and alleviate steel banded structure rank, and can satisfy demand in enormous quantities, high quality Pinion Steel user in conjunction with specific rolling technological parameter.
The invention has the beneficial effects as follows: adopt converter just to refine → ladle refining furnace refining or ladle furnace refining+vacuum degassing furnace refining → continuous casting → rolling production technical process production steel billet, through the Rolling Production round steel bar of specific rolling technological parameter.1. can realize the production of various composition Pinion Steels by technical requirements of users, needn't require to carry out the adjustment of composition span of control for reaching the banded structure rank, 2. need not change existing hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle furnace refining+vacuum degassing furnace refining → continuous casting production process pattern, only need to adjust rolling technological parameter and just can effectively control or alleviate steel banded structure rank, 3. control steel rolling different size, different finishing temperature realization 14mm respectively by means such as controlled chilling at rolling process
2～Φ 80mm
2Steel alleviate other purpose of banded structure level.4. by effectively controlling the banded structure rank, can satisfy high quality Pinion Steel user's demand, improve the up-to-standard rate of high-quality Pinion Steel.
Embodiment
Introduce technical scheme of the present invention in detail below by embodiment:
Embodiment 1:
1, adopt hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom.
2, steel billet is rolling in 1100 ℃ of beginnings after two sections full beam walking beam furnace heating, the continuous and controlled rolling by 20 closed red circle milling trains of short-stress path high strength, the control finishing temperature is in 750 ℃ of Φ 20mm that produce
2Hot rolled circular steel, its steel ferrite+perlite banded structure rank is 1.5 grades.
Embodiment 2:
1, adopt hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom.
2, steel billet is rolling in 1100 ℃ of beginnings after two sections full beam walking beam furnace heating, by 20 closed red circle milling train continuous rollings of short-stress path high strength and controlled rolling, the control finishing temperature is in 950 ℃ of Φ 25mm that produce
2Hot rolled circular steel, its steel ferrite+perlite banded structure is 2 grades.
Embodiment 3:
1, adopt hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom.
2, steel billet is rolling in 1080 ℃ of beginnings after two sections full beam walking beam furnace heating, by 20 closed red circle milling train continuous rollings of short-stress path high strength and controlled rolling, the control finishing temperature is in 846 ℃ of Φ 35mm that produce
2Hot rolled circular steel, its steel ferrite+perlite banded structure is 2 grades.
Embodiment 4:
1, adopt hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom.
2, steel billet is rolling in 1070 ℃ of beginnings after two sections full beam walking beam furnace heating, by 20 closed red circle milling train continuous rollings of short-stress path high strength and controlled rolling, the control finishing temperature is in 910 ℃ of Φ 55mm that produce
2Hot rolled circular steel, its steel ferrite+perlite banded structure is 2.5 grades.
Embodiment 5:
1, adopt hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom.
2, steel billet is rolling in 1070 ℃ of beginnings after two sections full beam walking beam furnace heating, by 20 short-stress path high rigidity closed type red circle milling train continuous rollings and controlled rolling, the control finishing temperature is in 930 ℃ of Φ 70mm that produce
2Hot rolled circular steel, its steel ferrite+perlite banded structure is 2.5 grades.
Claims (1)
1. control method of toothed wheel steel band structure is characterized in that:
Adopt hot metal pretreatment → converter just to refine → ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining → continuous casting process flow process production 180mm
2* 180mm
2The Pinion Steel continuously cast bloom, steel billet heating back is rolling in 1000 ℃～1100 ℃ beginnings, by 20 closed red circle milling train continuous rollings of short-stress path high strength, control finishing temperature respectively and produce Φ 14mm in 750 ℃～880 ℃ scopes or 910 ℃～950 ℃ scopes
2～Φ 70mm
2Hot rolled circular steel makes steel ferrite+perlite banded structure rank≤2.5 grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102237961A CN101381803B (en) | 2008-10-13 | 2008-10-13 | Control method of toothed wheel steel band structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102237961A CN101381803B (en) | 2008-10-13 | 2008-10-13 | Control method of toothed wheel steel band structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101381803A CN101381803A (en) | 2009-03-11 |
| CN101381803B true CN101381803B (en) | 2010-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102237961A Expired - Fee Related CN101381803B (en) | 2008-10-13 | 2008-10-13 | Control method of toothed wheel steel band structure |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103990938B (en) * | 2014-04-09 | 2017-04-05 | 江苏联峰能源装备有限公司 | With continuous casting billet Plastic Forming large scale bearing, the process of pinion steel |
| CN104014594A (en) * | 2014-06-06 | 2014-09-03 | 首钢总公司 | Method for overcoming post-cold-shearing lateral bending of gear steel bar |
| CN105779724B (en) * | 2014-12-22 | 2018-04-27 | 苏州苏信特钢有限公司 | The control method and pinion steel of a kind of toothed wheel steel band structure |
| CN105969962A (en) * | 2016-06-02 | 2016-09-28 | 溧阳市金昆锻压有限公司 | Control process of gear steel strip-shaped structure |
| CN110093474A (en) * | 2019-03-29 | 2019-08-06 | 邯郸钢铁集团有限责任公司 | A kind of production technology mitigating 22CrMoH toothed wheel steel band structure |
| CN111636029B (en) * | 2020-07-07 | 2021-11-02 | 承德建龙特殊钢有限公司 | Method for reducing band grade of CrMo series semi-axle steel in completely annealed state |
| CN115044827B (en) * | 2022-05-08 | 2023-06-16 | 江阴兴澄特种钢铁有限公司 | Production method of low-carbon gear steel free of isothermal annealing |
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- 2008-10-13 CN CN2008102237961A patent/CN101381803B/en not_active Expired - Fee Related
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| CN101381803A (en) | 2009-03-11 |
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