CN103192012A - Rolling production process of 20CrMnTi gear steel - Google Patents
Rolling production process of 20CrMnTi gear steel Download PDFInfo
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- CN103192012A CN103192012A CN2013101465942A CN201310146594A CN103192012A CN 103192012 A CN103192012 A CN 103192012A CN 2013101465942 A CN2013101465942 A CN 2013101465942A CN 201310146594 A CN201310146594 A CN 201310146594A CN 103192012 A CN103192012 A CN 103192012A
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Abstract
The invention discloses a rolling production process of 20CrMnTi gear steel, which comprises the following steps: heating a round steel billet: placing the round steel billet into a heating furnace to heat, wherein a preheating stage, a first heating stage, a second heating stage, and an average heating stage are sequentially implemented on the round steel billet, the temperature of the preheating stage is less or equal to 850 DEG C, the temperature of the first heating stage is 1200-1260 DEG C, the temperature of the second heating stage is 1200-1280 DEG C, and the temperature of the average heating stage is 1150-1250 DEG C; carrying out phosphorus removal on the round steel billet: carrying out phosphorus removal on the round steel billet to remove oxide scales by using high-pressure water; cogging and rolling: carrying out cogging and rolling on the round steel billet subjected to phosphorus removal so as to obtain a primary rolled billet; carrying out rolling by using a continuous rolling unit: putting the primary rolled billet into the continuous rolling unit to roll so as to obtain rolled steel; and cooling the rolled steel: after cutting the rolled steel, cooling the rolled steel on a slow cooling bed so as to obtain a finished product. According to the rolling production process disclosed by the invention, 20CrMnTi gear steel which is good in strength, plasticity and hardness can be produced.
Description
Technical field
The present invention relates to the metallurgical material field, specifically, relate to a kind of 20CrMnTi pinion steel Rolling Production technology.
Background technology
Along with the development of Domestic Automotive Industry, the consumption of pinion steel and kind are also growing, and be also more and more higher to the quality requirement of pinion steel.The 20CrMnTi steel is the leading kind of China's gear steel, is widely used in China, is used for gear, axle class, piston type spare and accessory parts and automobile, the various peculiar parts of aircraft position.But the 20CrMnTi steel contains carbide formers such as more Cr, Mn, and " TiN " the indeformable field trash that produces when smelting is harder than matrix, influences machining accuracy, can form tired source in use and influences fatigue life of gear; Simultaneously, also there is the quenching degree instability in this material, is out of shape shortcomings such as big, is replaced by Cr-Mo steel, Mn-Cr steel, Mn-Cr-B steel, Cr-Ni-Mn steel, Cr steel just gradually.But because 20CrMnTi has cost performance preferably, and the essential element Cr of this steel and Mn are that China is rich in element, grain growth tendentiousness is little, good processability, it is familiar to its technology to add everybody, the at present suitable steel grade that substitutes is not really established as yet, so 20CrMnTi remains a kind of main carburized gears steel.In order to enlarge output and energy efficient, present numerous Gear Production producer does not carry out follow-up technologies such as heat treatment to the 20CrMnTi steel, be directly used in machining, cause often occurring processing problems such as embrittlement, hard spot in the manufacture process, and cause the waste of production cost.So, develop and satisfy that the 20CrMnTi steel is to have very important significance under the harsh conditions.
Summary of the invention
Technical problem to be solved by this invention provides a kind of 20CrMnTi pinion steel Rolling Production technology, can produce the 20CrMnTi pinion steel with good strength, plasticity and hardness.
Technical scheme of the present invention is as follows:
A kind of 20CrMnTi pinion steel Rolling Production technology comprises: the round steel billet heating: round steel billet is put into heating furnace heat, be followed successively by preheating section, two sections of heating, heating one section, soaking zone; Wherein, preheating section temperature≤850 ℃, heating two sections temperature is 1200～1260 ℃, and heating one section temperature is 1200～1280 ℃, and the soaking zone temperature is 1150～1250 ℃; The round steel billet dephosphorization: the round steel billet after will heating adopts dephosphorize by high pressure water to remove iron scale; Split rolling method: the round steel billet after the dephosphorization is carried out split rolling method obtain bloom; The tandem rolling unit is rolling: bloom is put into the tandem rolling unit is rolling to obtain steel rolling; Steel rolling cooling: will obtain finished product in the cooling of slow cooling bed after the steel rolling sawing.
Further: the temperature of described soaking zone is lower than the temperature of one section of described heating.
Further: be 50～60min the heat time heating time of described soaking zone.
Further: described round steel billet adds thermal recovery syllogic walking beam furnace.
Further: start rolling temperature is 1100～1180 ℃.
Further: the tandem rolling temperature is 890～950 ℃.
Further: finishing temperature is 820～900 ℃.
Further: described steel rolling cooling comprises stand cooling and stacking slow cooling.
Further: control the speed of described stand cooling, cooling velocity≤15 ℃/min, described stand cooling back round steel temperature 〉=350 ℃.
Further: the mode of described stacking slow cooling is stacked for stack.
Technique effect of the present invention is as follows:
1, the Rolling Production technology of the present invention field trash that obtains the 20CrMnTi pinion steel tiny, be evenly distributed, institutional framework is suitable, crystal grain is tiny, rolling back 20CrMnTi round steel grain size can reach 8 grades at least.
2, Rolling Production technology of the present invention obtains the 20CrMnTi pinion steel and has good intensity, toughness and mechanical property, satisfies some gear manufactories carry out machining without heat treatment requirement.
3, Rolling Production technology of the present invention every performance of obtaining the 20CrMnTi pinion steel satisfies the requirement of harsh conditions Gear Production.
The specific embodiment
The 20CrMnTi round steel material of the present invention's preparation, the quality percentage composition of its chemical composition is: C0.17～0.23; Si0.17～0.37; Mn0.80～1.10; Cr1.00～1.30; Ti0.04～0.10; P≤0.025; S≤0.020; Al0.02～0.05; All the other are Fe, and mass fraction amounts to 100%.Chromium in this material, manganese are the main added elements of 20CrMnTi steel, play the effect that improves matrix strength and increase quenching degree.And the adding of titanium makes grain refinement in the steel, grain growth in the time of can preventing carburizing, and improved intensity and the toughness of steel.
Before carrying out this 20CrMnTi round steel material Rolling Production, carry out STEELMAKING PRODUCTION earlier.
Steel-smelting production process is: the molten iron preliminary treatment → converter smelting → LF refining → VD degassing → continuous casting.
Wherein, converter smelting adopts desulphurised hot metal, silicomanganese and ferrochrome deoxidation alloying.The amount of deoxidier is generally determined according to aim carbon.In the converter smelting process process of the present invention, adding deoxidier when smelting 20CrMnTi is aluminium ferromanganese, addition is the 300kg/ stove, the molten iron addition is 95 tons/stove, adding amount of scrap steel is 20 tons/stove, silicomangan addition 1200kg/ stove, the ferrochrome addition is the 1800kg/ stove, every stove tap is 105 tons.Tapping temperature 〉=1600 ℃ add top slag lime 300kg in the tapping process.Wherein, deoxidier finishes when beginning to join tapping to 1/2 after will be at the bottom of molten steel is paved with jar, and silicomanganese and ferrochrome will finish when tapping began to join tapping to 1/2 to 1/4 o'clock.
Then according to chemical composition and the temperature of molten steel behind the converter tapping, at LF(Ladle Furnace) be to carry out slag making desulfurization, composition adjustment and warming temperature in the ladle furnace, argon bottom-blowing stirs through whole refining process.
Subsequently ladle is moved to VD(Vacuum Degassing) be that the vacuum argon blowing degassing method is handled station, the vacuum≤0.10KPa of the VD degassing, dark vacuum time 〉=13min, degree of supercooling Δ T≤30 ℃.Under the omnidistance argon bottom-blowing stirring condition, reach the degassing, go to be mingled with, the purpose of even composition and temperature.
The molten steel that chemical composition and temperature are met the demands winches to the round billet continuous casting machine and casts, and obtains the round steel blank of required specification.Adopt the crystallizer electromagnetic agitation in the casting process; The whole process protection casting; namely adopt solid protective slag protection, ladle to adopt long nozzle protection, tundish to adopt the submersed nozzle protection to crystallizer to tundish at tundish and crystallizer liquid steel level; the control degree of superheat≤30 ℃ have good inside and outside quality to guarantee strand.
Obtain the round steel blank by above-mentioned steel-smelting production process.The chemical composition of the round steel blank of each embodiment is as shown in table 1.
Each embodiment composition of table 1 (mass percent/%)
The round steel billet that STEELMAKING PRODUCTION is obtained is rolled production, and key step is as follows:
Step S1: round steel billet heating.
Round steel billet is put into the syllogic walking beam furnace heat, be followed successively by preheating section, two sections of heating, heating one section, soaking zone.Wherein, preheating section temperature≤850 ℃, heating two sections temperature is 1200～1260 ℃, and heating one section temperature is 1200～1280 ℃, and the soaking zone temperature is 1150～1250 ℃.Soaking zone (burner) temperature is lower than one section (furnace bosh) temperature of heating, makes finished product can reduce the appearance of shear fissure like this when machining.Each section heat time heating time is according to the blank specification and different, but soaking zone is 50～60min heat time heating time.
Step S2: round steel billet dephosphorization.
Adopt dephosphorize by high pressure water to remove iron scale the round steel billet after the heating.
Step S3: split rolling method.
Round steel billet after the dephosphorization is carried out split rolling method obtain bloom.
Step S4: the tandem rolling unit is rolling.
Bloom put into the tandem rolling unit is rolling to obtain steel rolling.Start rolling temperature is 1100～1180 ℃, and entering the tandem rolling temperature is 890～950 ℃, and finishing temperature is 820～900 ℃.
Step S5: steel rolling cooling.
To obtain finished product in the cooling of slow cooling bed after the steel rolling sawing.The steel rolling cooling comprises stand cooling and stacking slow cooling.If being high-carbon, high alloy steel rolling, steel rolling also need to adopt the mode of stacking slow cooling to cool off.Control the speed of stand cooling.Rolling Production 20CrMnTi round steel of the present invention cools off at shorter 10m cold bed, this cold bed cooling velocity≤15 ℃/min.Stand cooling back round steel temperature 〉=350 ℃.The mode of stacking slow cooling is stacked for stack.
The concrete Rolling Production process of various embodiments of the present invention is: blank is inspected for acceptance, and----------coming out of the stove,------the tandem rolling unit is rolling, and----------high-carbon, high-alloy steel stacking slow cooling--check--reconditioning--aligning--bundling----warehouse-in--sign--delivery of weighing to split rolling method to high-pressure water descaling to the heating round steel billet in collection in the number of retouching in the stand cooling in the hot saw sawing in shove charge to remove residue in the line cutting.
Under this Rolling Production technology, the 20CrMnTi round steel of preferred embodiment is as shown in table 2 without the metallographic structure assay under the heat treatment hot rolling attitude, and the mechanical property under the heat treatment hot rolling attitude is not as shown in table 3.
Each embodiment metallographic structure of table 2
Annotate: P is pearlite in the table, and F is ferrite
Each embodiment mechanical property of table 3
As can be found from Table 2, each embodiment field trash is tiny, be evenly distributed, and institutional framework is suitable, and crystal grain is tiny, and rolling back 20CrMnTi round steel grain size can reach 8 grades at least.As can be seen from Table 3, each embodiment has good intensity, toughness and mechanical property, satisfies some gear manufactories carry out machining without heat treatment requirement.Every performance satisfies the requirement of harsh conditions Gear Production.
The present invention provides a kind of Rolling Production technology of the 20CrMnTi of optimization round steel mechanical property for special steel branch company of Baogang.Under this technology, Cr, Mn alloying element exist the steel that make to have good strength and through hardening performance, and the Ti element forms compound in the operation of rolling, can make grain refinement in the steel, and grain growth when preventing carburizing, have improved intensity and the toughness of steel.With the gear of its preparation, has good intensity and plasticity.The present invention is a kind of technology that the 20CrMnTi round rolling is produced, its method uniqueness, and engineering goods efficient height such as 20CrMnTi round steel manufacturing gear, the cost produced with this process are low, energy-conserving and environment-protective, good in economic efficiency, sell extensively, have excellent generalization values.
Claims (10)
1. a 20CrMnTi pinion steel Rolling Production technology is characterized in that, comprising:
Round steel billet heating: round steel billet is put into heating furnace heat, be followed successively by preheating section, two sections of heating, heating one section, soaking zone; Wherein, preheating section temperature≤850 ℃, heating two sections temperature is 1200～1260 ℃, and heating one section temperature is 1200～1280 ℃, and the soaking zone temperature is 1150～1250 ℃;
The round steel billet dephosphorization: the round steel billet after will heating adopts dephosphorize by high pressure water to remove iron scale;
Split rolling method: the round steel billet after the dephosphorization is carried out split rolling method obtain bloom;
The tandem rolling unit is rolling: bloom is put into the tandem rolling unit is rolling to obtain steel rolling;
Steel rolling cooling: will obtain finished product in the cooling of slow cooling bed after the steel rolling sawing.
2. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 1, it is characterized in that: the temperature of described soaking zone is lower than the temperature of one section of described heating.
3. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 1, it is characterized in that: be 50～60min the heat time heating time of described soaking zone.
4. as the arbitrary described 20CrMnTi pinion steel Rolling Production technology of claim 1～3, it is characterized in that: described round steel billet adds thermal recovery syllogic walking beam furnace.
5. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 1, it is characterized in that: start rolling temperature is 1100～1180 ℃.
6. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 1, it is characterized in that: the tandem rolling temperature is 890～950 ℃.
7. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 1, it is characterized in that: finishing temperature is 820～900 ℃.
8. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 1 is characterized in that: described steel rolling cooling comprises stand cooling and stacking slow cooling.
9. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 8 is characterized in that: control the speed of described stand cooling, cooling velocity≤15 ℃/min, described stand cooling back round steel temperature 〉=350 ℃.
10. 20CrMnTi pinion steel Rolling Production technology as claimed in claim 8 is characterized in that: the mode of described stacking slow cooling is stacked for stack.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882201A (en) * | 2014-03-19 | 2014-06-25 | 武汉钢铁(集团)公司 | Rolling process capable of improving hot-upsetting performance of 20 Cr 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 |
| CN105671281A (en) * | 2016-03-25 | 2016-06-15 | 首钢总公司 | Production method for alloy steel bar with hardness lower than 200 HBW |
| CN106011648A (en) * | 2016-07-22 | 2016-10-12 | 武汉钢铁股份有限公司 | Gear steel and production method thereof |
| CN107225148A (en) * | 2017-06-01 | 2017-10-03 | 马鞍山钢铁股份有限公司 | A kind of milling method of 22CrMoH pinion steels |
| CN107254624A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | A kind of diameter 90mm above Big sized gear steel and its production method |
| CN108906884A (en) * | 2018-06-22 | 2018-11-30 | 大冶特殊钢股份有限公司 | A kind of zerolling production method of high-performance 20CrMnTi pinion steel |
| CN110129653A (en) * | 2019-05-21 | 2019-08-16 | 柳州钢铁股份有限公司 | A kind of production method of soft 20CrMnTi round steel |
| CN111570513A (en) * | 2020-05-25 | 2020-08-25 | 江苏联峰实业有限公司 | Fine-grain gear steel and preparation method thereof |
| CN112496032A (en) * | 2020-11-23 | 2021-03-16 | 浙江天马轴承集团有限公司 | Rolling production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar |
| CN112570451A (en) * | 2020-11-26 | 2021-03-30 | 宝钢特钢韶关有限公司 | 20CrMnTi steel and production method thereof |
| CN113046535A (en) * | 2021-03-16 | 2021-06-29 | 宝武杰富意特殊钢有限公司 | Method for controlling rolling hardness of medium-bar gear round steel |
| CN115415320A (en) * | 2022-08-31 | 2022-12-02 | 大冶特殊钢有限公司 | Rolling method of 20Cr steel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04124217A (en) * | 1990-09-12 | 1992-04-24 | Toa Steel Co Ltd | Production of high strength gear steel excellent in softening property |
| JPH1017928A (en) * | 1996-06-28 | 1998-01-20 | Kawasaki Steel Corp | Production of gear steel stock for induction hardening, excellent in machinability and fatigue strength |
| CN101275204A (en) * | 2008-03-26 | 2008-10-01 | 莱芜钢铁股份有限公司 | Cr-Mn-Ti gear steel and preparation thereof |
| CN101289731A (en) * | 2008-05-09 | 2008-10-22 | 莱芜钢铁股份有限公司 | CrMnTi narrow hardenability strip pinion steels and method of manufacture |
| CN101812643A (en) * | 2009-11-30 | 2010-08-25 | 莱芜钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| CN102162067A (en) * | 2011-03-28 | 2011-08-24 | 首钢总公司 | Steel for anticorrosion sucker rods in oil field and production method thereof |
| CN103045947A (en) * | 2012-12-08 | 2013-04-17 | 内蒙古包钢钢联股份有限公司 | Manufacturing method of high-strength and high-toughness gear steel |
-
2013
- 2013-04-25 CN CN201310146594.2A patent/CN103192012B/en not_active Withdrawn - After Issue
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04124217A (en) * | 1990-09-12 | 1992-04-24 | Toa Steel Co Ltd | Production of high strength gear steel excellent in softening property |
| JPH1017928A (en) * | 1996-06-28 | 1998-01-20 | Kawasaki Steel Corp | Production of gear steel stock for induction hardening, excellent in machinability and fatigue strength |
| CN101275204A (en) * | 2008-03-26 | 2008-10-01 | 莱芜钢铁股份有限公司 | Cr-Mn-Ti gear steel and preparation thereof |
| CN101289731A (en) * | 2008-05-09 | 2008-10-22 | 莱芜钢铁股份有限公司 | CrMnTi narrow hardenability strip pinion steels and method of manufacture |
| CN101812643A (en) * | 2009-11-30 | 2010-08-25 | 莱芜钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| CN102162067A (en) * | 2011-03-28 | 2011-08-24 | 首钢总公司 | Steel for anticorrosion sucker rods in oil field and production method thereof |
| CN103045947A (en) * | 2012-12-08 | 2013-04-17 | 内蒙古包钢钢联股份有限公司 | Manufacturing method of high-strength and high-toughness gear steel |
Non-Patent Citations (2)
| Title |
|---|
| 袁武华等: ""终轧温度及轧后冷却速率对20CrMnTi钢棒材显微组织及硬度的影响"", 《机械工程材料》, vol. 37, no. 2, 28 February 2013 (2013-02-28), pages 6 - 9 * |
| 郑晓宁等: ""20CrMnTiH渗碳齿轮钢的带状组织控制"", 《河北冶金》, no. 205, 31 January 2013 (2013-01-31), pages 56 - 57 * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103882201A (en) * | 2014-03-19 | 2014-06-25 | 武汉钢铁(集团)公司 | Rolling process capable of improving hot-upsetting performance of 20 Cr 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 |
| CN105671281A (en) * | 2016-03-25 | 2016-06-15 | 首钢总公司 | Production method for alloy steel bar with hardness lower than 200 HBW |
| CN106011648A (en) * | 2016-07-22 | 2016-10-12 | 武汉钢铁股份有限公司 | Gear steel and production method thereof |
| CN107225148A (en) * | 2017-06-01 | 2017-10-03 | 马鞍山钢铁股份有限公司 | A kind of milling method of 22CrMoH pinion steels |
| CN107254624A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | A kind of diameter 90mm above Big sized gear steel and its production method |
| CN107225148B (en) * | 2017-06-01 | 2019-02-19 | 马鞍山钢铁股份有限公司 | A kind of milling method of 22CrMoH pinion steel |
| CN108906884B (en) * | 2018-06-22 | 2020-08-14 | 大冶特殊钢有限公司 | Low-temperature rolling production method of high-performance 20CrMnTi gear steel |
| CN108906884A (en) * | 2018-06-22 | 2018-11-30 | 大冶特殊钢股份有限公司 | A kind of zerolling production method of high-performance 20CrMnTi pinion steel |
| CN110129653A (en) * | 2019-05-21 | 2019-08-16 | 柳州钢铁股份有限公司 | A kind of production method of soft 20CrMnTi round steel |
| CN110129653B (en) * | 2019-05-21 | 2020-12-01 | 柳州钢铁股份有限公司 | Production method of low-hardness 20CrMnTi round steel |
| CN112553538A (en) * | 2019-05-21 | 2021-03-26 | 柳州钢铁股份有限公司 | Low-hardness 20CrMnTi round steel |
| CN112553538B (en) * | 2019-05-21 | 2021-10-29 | 柳州钢铁股份有限公司 | Low-hardness 20CrMnTi round steel |
| CN111570513A (en) * | 2020-05-25 | 2020-08-25 | 江苏联峰实业有限公司 | Fine-grain gear steel and preparation method thereof |
| CN112496032A (en) * | 2020-11-23 | 2021-03-16 | 浙江天马轴承集团有限公司 | Rolling production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar |
| CN112570451A (en) * | 2020-11-26 | 2021-03-30 | 宝钢特钢韶关有限公司 | 20CrMnTi steel and production method thereof |
| CN113046535A (en) * | 2021-03-16 | 2021-06-29 | 宝武杰富意特殊钢有限公司 | Method for controlling rolling hardness of medium-bar gear round steel |
| CN115415320A (en) * | 2022-08-31 | 2022-12-02 | 大冶特殊钢有限公司 | Rolling method of 20Cr steel |
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