CN103192012B - A kind of 20CrMnTi pinion steel rolling process - Google Patents
A kind of 20CrMnTi pinion steel rolling process Download PDFInfo
- Publication number
- CN103192012B CN103192012B CN201310146594.2A CN201310146594A CN103192012B CN 103192012 B CN103192012 B CN 103192012B CN 201310146594 A CN201310146594 A CN 201310146594A CN 103192012 B CN103192012 B CN 103192012B
- Authority
- CN
- China
- Prior art keywords
- rolling
- temperature
- heating
- steel
- round steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of 20CrMnTi pinion steel rolling process, comprising: round steel billet heats: round steel billet is put into heating furnace and heats, be followed successively by preheating section, heating two sections, heating one section, soaking zone; Wherein, preheating section temperature≤850 DEG C, heating two sections of temperature is 1200 ~ 1260 DEG C, and heating one section of temperature is 1200 ~ 1280 DEG C, and soaking zone temperature is 1150 ~ 1250 DEG C; Round steel billet dephosphorization: adopt dephosphorize by high pressure water to remove iron scale the round steel billet after heating; Split rolling method: the round steel billet after dephosphorization is carried out split rolling method and obtains bloom; Continuous mill train rolling: bloom is put into Continuous mill train rolling and obtain steel rolling; Steel rolling cools: obtain finished product by cooling on slow cooling bed after steel rolling sawing.Rolling process of the present invention can produce the 20CrMnTi pinion steel with good strength, plasticity and hardness.
Description
Technical field
The present invention relates to metallurgical material field, specifically, relate to a kind of 20CrMnTi pinion steel rolling process.
Background technology
Along with the development of Domestic Automotive Industry, the consumption of pinion steel and kind are also growing, also more and more higher to the quality requirement of pinion steel.The Variety comprehensive of 20CrMnTi Gang Shi China gear steel, is widely used in China, for gear, axle class, piston type spare and accessory parts and automobile, the various peculiar part position of aircraft.But 20CrMnTi steel contains the carbide formers such as more Cr, Mn, when smelting, " TiN " indeformable field trash of producing is harder than matrix, affects machining accuracy, can form tired source in use and affect fatigue life of gear; Meanwhile, also there is quenching degree instability, be out of shape the shortcomings such as large in this material, just gradually by Cr-Mo steel, Mn-Cr steel, Mn-Cr-B steel, Cr-Ni-Mn steel, Cr steel replace.But because 20CrMnTi has good cost performance, and essential element Cr and Mn of this steel is China is rich in element, Grain growth trend is little, good processability, add that everybody is familiar with its technics comparing, substitute steel grade suitable at present is not yet really established, so 20CrMnTi remains a kind of main carburized gears steel.In order to expand output and save energy consumption, current numerous Gear Production producer does not carry out the techniques such as follow-up heat treatment to 20CrMnTi steel, be directly used in machining, cause often occurring the processing problems such as embrittlement, hard spot in manufacture process, and cause the waste of production cost.So, develop that to meet 20CrMnTi steel under harsh conditions be have very important significance.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of 20CrMnTi pinion steel rolling process, 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 process, comprising: round steel billet heats: round steel billet is put into heating furnace and heats, and is followed successively by preheating section, heating two sections, heating one section, soaking zone; Wherein, preheating section temperature≤850 DEG C, heating two sections of temperature is 1200 ~ 1260 DEG C, heating one section of temperature is 1200 ~ 1280 DEG C, soaking zone temperature is 1150 ~ 1250 DEG C, and the temperature of described soaking zone is lower than the temperature of described heating one section, and the heat time of described soaking zone is 50 ~ 60min; Round steel billet dephosphorization: adopt dephosphorize by high pressure water to remove iron scale the round steel billet after heating; Split rolling method: the round steel billet after dephosphorization is carried out split rolling method and obtains bloom; Continuous mill train rolling: bloom is put into Continuous mill train rolling and obtain steel rolling, start rolling temperature is 1100 ~ 1180 DEG C, and tandem rolling temperature is 890 ~ 950 DEG C, and finishing temperature is 820 ~ 900 DEG C; Steel rolling cools: obtain finished product by cooling on slow cooling bed after steel rolling sawing; Described steel rolling cooling comprises stand cooling and stacking slow cooling, controls the speed of described stand cooling, cooling velocity≤15 DEG C/min, round steel temperature >=350 DEG C after described stand cooling, and the mode of described stacking slow cooling is stacked for superposition.
Further: described round steel billet heating adopts syllogic walking beam furnace.
Technique effect of the present invention is as follows:
1, rolling process of the present invention obtain the field trash of 20CrMnTi pinion steel tiny, be evenly distributed, institutional framework is suitable for, and crystal grain is tiny, and after rolling, 20CrMnTi round steel grain size at least can reach 8 grades.
2, rolling process of the present invention obtains 20CrMnTi pinion steel and has good intensity, toughness and mechanical property, meets some gear manufacture factories carry out machining requirement without heat treatment.
3, the properties that rolling process of the present invention obtains 20CrMnTi pinion steel meets the requirement of harsh conditions Gear Production.
Detailed description of the invention
20CrMnTi round steel material prepared by the present invention, the mass percentage of its chemical composition is: C0.17 ~ 0.23; Si 0.17 ~ 0.37; Mn 0.80 ~ 1.10; Cr 1.00 ~ 1.30; Ti 0.04 ~ 0.10; P≤0.025; S≤0.020; Al 0.02 ~ 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 improving matrix strength and increase quenching degree.And adding of titanium makes grain refinement in steel, grain growth when can prevent carburizing, and improve intensity and the toughness of steel.
Before carrying out this 20CrMnTi round steel material Rolling Production, first carry out STEELMAKING PRODUCTION.
Steel-smelting production process is: molten iron pretreatment → converter smelting → LF refining → VD is degassed → and 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 converter smelting process process of the present invention, adding deoxidier when smelting 20CrMnTi is aluminium ferromanganese, addition is 300kg/ stove, molten iron addition is 95 tons/stove, adding amount of scrap steel is 20 tons/stove, silicomangan addition 1200kg/ stove, ferrochrome addition is 1800kg/ stove, and every stove tap is 105 tons.Tapping temperature >=1600 DEG C, add top slag lime 300kg in tapping process.Wherein, deoxidier will molten steel be paved with to start after at the bottom of tank to join tapping to 1/2 time terminate, silicomanganese and ferrochrome will tap to 1/4 time start to join tapping to 1/2 time terminate.
Then according to chemical composition and the temperature of molten steel after converter tapping, in LF (Ladle Furnace) i.e. ladle furnace, carry out slag making desulfurization, composition adjustment and warming temperature, argon bottom-blowing stirs through whole refining process.
Subsequently ladle is moved to VD (Vacuum Degassing) i.e. vacuum argon blowing degassing method process station, vacuum≤0.10KPa that VD is degassed, dark vacuum time >=13min, degree of supercooling Δ T≤30 DEG C.Under the condition that omnidistance argon bottom-blowing stirs, reach degassed, go to be mingled with, the object of non-uniform components and temperature.
The molten steel that chemical composition and temperature meet the demands is winched to round billet continuous casting machine cast, obtain the round steel blank of required specification.M-EMS is adopted in casting process; Whole process protection is cast; namely on tundish and crystallizer liquid steel level, adopt solid protective slag protection, ladle adopts long nozzle protection to tundish, tundish adopts submersed nozzle protection to crystallizer; control the degree of superheat≤30 DEG C, to ensure that strand has good inside and outside quality.
Round steel blank is obtained by above-mentioned steel-smelting production process.The chemical composition of the round steel blank of each embodiment is as shown in table 1.
The each embodiment composition of table 1 (mass percent/%)
Round steel billet STEELMAKING PRODUCTION obtained is rolled production, and key step is as follows:
Step S1: round steel billet heats.
Round steel billet is put into syllogic walking beam furnace to heat, be followed successively by preheating section, heating two sections, heating one section, soaking zone.Wherein, preheating section temperature≤850 DEG C, heating two sections of temperature is 1200 ~ 1260 DEG C, and heating one section of temperature is 1200 ~ 1280 DEG C, and soaking zone temperature is 1150 ~ 1250 DEG C.Soaking zone (burner) temperature, lower than heating one section of (furnace bosh) temperature, makes finished product can reduce the appearance of shear fissure when machining like this.Each period of heat time is different according to blank specification, but the soaking zone heat time is 50 ~ 60min.
Step S2: round steel billet dephosphorization.
Dephosphorize by high pressure water is adopted to remove iron scale the round steel billet after heating.
Step S3: split rolling method.
Round steel billet after dephosphorization is carried out split rolling method and obtains bloom.
Step S4: Continuous mill train rolling.
Bloom is put into Continuous mill train rolling and obtain steel rolling.Start rolling temperature is 1100 ~ 1180 DEG C, and entering tandem rolling temperature is 890 ~ 950 DEG C, and finishing temperature is 820 ~ 900 DEG C.
Step S5: steel rolling cools.
Finished product is obtained by cooling on slow cooling bed after steel rolling sawing.Steel rolling cooling comprises stand cooling and stacking slow cooling.If steel rolling is high-carbon, high alloy steel rolling also needs to adopt the mode of stacking slow cooling to cool.Control the speed of stand cooling.Rolling Production 20CrMnTi round steel of the present invention cools at shorter 10m cold bed, this cold bed cooling velocity≤15 DEG C/min.Round steel temperature >=350 DEG C after stand cooling.The mode of stacking slow cooling is superposition stacking.
The concrete Rolling Production process of various embodiments of the present invention is: blank is inspected for acceptance, and---------------coming out of the stove,------------------------high-carbon, high-alloy steel stacking slow cooling---check---reconditioning---aligning---bundling------warehouse-in---mark---delivery of weighing to the number of retouching to split rolling method to high-pressure water descaling to heating round steel billet in collection in stand cooling in hot saw sawing in Continuous mill train rolling in shove charge to remove residue in line cutting.
Under this rolling process, the 20CrMnTi round steel of preferred embodiment is as shown in table 2 without the microstructure examination result under heat treatment As rolled, and the mechanical property under non-heat treatment As rolled is as shown in table 3.
The each embodiment metallographic structure of table 2
Note: in table, P is pearlite, F is ferrite
The 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 for, and crystal grain is tiny, and after rolling, 20CrMnTi round steel grain size at least can reach 8 grades.As can be seen from Table 3, each embodiment has good intensity, toughness and mechanical property, meets some gear manufacture factories carry out machining requirement without heat treatment.Properties meets the requirement of harsh conditions Gear Production.
The present invention is that special steel branch company of Baogang provides a kind of rolling process optimizing 20CrMnTi round steel mechanical property.Under this technique, there are the steel made and have good strength and through hardening performance in Cr, Mn alloying element, Ti element forms compound in the operation of rolling, can make grain refinement in steel, and grain growth when preventing carburizing, improve intensity and the toughness of steel.With the gear that it is prepared, there is good intensity and plasticity.The engineering goods efficiency such as the present invention is a kind of technique that 20CrMnTi round rolling is produced, and its method is unique, the 20CrMnTi round steel manufacture gear produced by this process are high, cost is low, energy-conserving and environment-protective, good in economic efficiency, sell extensively, there is good promotional value.
Claims (2)
1. a 20CrMnTi pinion steel rolling process, is characterized in that, comprising:
Round steel billet heats: round steel billet is put into heating furnace and heats, and is followed successively by preheating section, heating two sections, heating one section, soaking zone; Wherein, preheating section temperature≤850 DEG C, heating two sections of temperature is 1200 ~ 1260 DEG C, heating one section of temperature is 1200 ~ 1280 DEG C, soaking zone temperature is 1150 ~ 1250 DEG C, and the temperature of described soaking zone is lower than the temperature of described heating one section, and the heat time of described soaking zone is 50 ~ 60min;
Round steel billet dephosphorization: adopt dephosphorize by high pressure water to remove iron scale the round steel billet after heating;
Split rolling method: the round steel billet after dephosphorization is carried out split rolling method and obtains bloom;
Continuous mill train rolling: bloom is put into Continuous mill train rolling and obtain steel rolling, start rolling temperature is 1100 ~ 1180 DEG C, and tandem rolling temperature is 890 ~ 950 DEG C, and finishing temperature is 820 ~ 900 DEG C;
Steel rolling cools: obtain finished product by cooling on slow cooling bed after steel rolling sawing; Described steel rolling cooling comprises stand cooling and stacking slow cooling, controls the speed of described stand cooling, cooling velocity≤15 DEG C/min, round steel temperature >=350 DEG C after described stand cooling, and the mode of described stacking slow cooling is stacked for superposition.
2. 20CrMnTi pinion steel rolling process as claimed in claim 1, is characterized in that: described round steel billet heating adopts syllogic walking beam furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310146594.2A CN103192012B (en) | 2013-04-25 | 2013-04-25 | A kind of 20CrMnTi pinion steel rolling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310146594.2A CN103192012B (en) | 2013-04-25 | 2013-04-25 | A kind of 20CrMnTi pinion steel rolling process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103192012A CN103192012A (en) | 2013-07-10 |
| CN103192012B true CN103192012B (en) | 2015-09-16 |
Family
ID=48714930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310146594.2A Withdrawn - After Issue CN103192012B (en) | 2013-04-25 | 2013-04-25 | A kind of 20CrMnTi pinion steel rolling process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103192012B (en) |
Families Citing this family (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 |
| CN106011648B (en) * | 2016-07-22 | 2018-01-16 | 武汉钢铁有限公司 | A kind of pinion steel and its production method |
| CN107254624B (en) * | 2017-06-01 | 2019-03-19 | 马鞍山钢铁股份有限公司 | A kind of above Big sized gear steel of diameter 90mm 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 |
| 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 |
| 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 |
| CN112496032B (en) * | 2020-11-23 | 2022-09-02 | 浙江天马轴承集团有限公司 | Rolling production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar |
| CN112570451B (en) * | 2020-11-26 | 2022-08-02 | 宝武杰富意特殊钢有限公司 | 20CrMnTi steel and production method thereof |
| CN113046535B (en) * | 2021-03-16 | 2022-11-08 | 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (3)
| 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 |
| JP3550886B2 (en) * | 1996-06-28 | 2004-08-04 | Ｊｆｅスチール株式会社 | Manufacturing method of gear steel for induction hardening excellent in machinability and fatigue strength |
| CN102162067B (en) * | 2011-03-28 | 2013-05-22 | 首钢总公司 | Steel for anticorrosion sucker rods in oil field and production method thereof |
-
2013
- 2013-04-25 CN CN201310146594.2A patent/CN103192012B/en not_active Withdrawn - After Issue
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 (1)
| Title |
|---|
| "20CrMnTiH渗碳齿轮钢的带状组织控制";郑晓宁等;《河北冶金》;20130131(第205期);第56-57页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103192012A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103192012B (en) | A kind of 20CrMnTi pinion steel rolling process | |
| CN101289731B (en) | CrMnTi narrow hardenability strip pinion steels and method of manufacture | |
| CN109338035B (en) | Steel for wind driven generator gear box bearing and production method thereof | |
| CN102433504B (en) | Steel for medium/heavy duty vehicle gear shaft blank in cross wedge rolling process and preparation method thereof | |
| CN104032214B (en) | A kind of non-hardened and tempered steel and production technique thereof | |
| CN102703817B (en) | Free-machining pinion steel and production technique thereof | |
| CN102107215B (en) | Resource-saving boron-containing high-speed steel composite roll and preparation method thereof | |
| CN103160729B (en) | Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof | |
| CN101530863B (en) | Alloy cast steel roll and preparation method thereof | |
| CN103290339B (en) | High-strength steel plate for 800MPa hydropower station pressure pipeline and production method thereof | |
| CN103556069B (en) | A kind of gas cylinder seamless large-diameter pipes and manufacture method thereof | |
| CN103556055B (en) | For the hot rolled H-shaped and production method of ocean natural gas production platform structure | |
| CN104046914A (en) | Non-quenched and non-tempered steel and production technology thereof | |
| CN103966515B (en) | A kind of method utilizing electric arc furnace to prepare low-alloy high-strength toughness cast steel adding | |
| CN103667947B (en) | Without the stainless manufacturing process of nickel Austriaization body | |
| CN105908080A (en) | Preparation method for high-manganese steel for ocean platform and continuous casting slab of high-manganese steel | |
| CN104032224B (en) | A kind of non-hardened and tempered steel and production technique thereof | |
| CN104762559A (en) | Method for producing steel plate for hydrogen-contacting equipment | |
| CN102876997B (en) | Easy-welding tempering high-strength steel plate for ocean platform and production method thereof | |
| CN102517513A (en) | Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof | |
| CN103484766A (en) | Hardened and tempered high-strength and low-weld crack sensitivity steel plate for 600MPa-level water-power engineering and preparing method thereof | |
| CN105154778A (en) | Cold forging steel coil for welding and producing method for cold forging steel coil | |
| CN105734414A (en) | Medium-carbon non-quenched and tempered steel and production method thereof | |
| CN103361550B (en) | The Q370 container steel of Simulated post-weld heat treatment excellent property and production method | |
| CN102899563B (en) | A kind of production method of ultra-high strength steel plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150916 Effective date of abandoning: 20220622 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20150916 Effective date of abandoning: 20220622 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |