CN104233109B - Heat-treating process of high-speed train axle containing niobium and titanium - Google Patents
Heat-treating process of high-speed train axle containing niobium and titanium Download PDFInfo
- Publication number
- CN104233109B CN104233109B CN201410532094.7A CN201410532094A CN104233109B CN 104233109 B CN104233109 B CN 104233109B CN 201410532094 A CN201410532094 A CN 201410532094A CN 104233109 B CN104233109 B CN 104233109B
- Authority
- CN
- China
- Prior art keywords
- steel
- axletree
- bullet train
- niobium
- vanadium containing
- 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.)
- Active
Links
Abstract
The invention disclose a steel for a high-speed train axle containing niobium and titanium, and the steel comprises the chemical components based on the mass percentage (wt%): 0.25-0.32 wt% of C, 0.15-0.40 wt% of Si, 0.60-0.90 wt% of Mn, no more than 0.015 wt% of P, no more than 0.010 wt% of S, 1.00-1.20 wt% of Cr, 0.20-0.35 wt% of Mo, 0.15-0.30 wt% of Ni, 0.02-0.04 wt% of V, 0.015-0.040 wt% of Nb, 0.10-0.30 wt% of Cu, 0.0008-0.0050 wt% of B, and 0.010-0.050 wt% of A1S, after the axle prepared by the components is thermally treated, the grain size is no less than 8.5 grades, and the tissue is tempered sorbite+bainite, wherein the content of the tempered sorbite adjacent to the axle surface is about 70-90%, and the the content of the tempered sorbite at the 1/2 radius of the axle is about 40-60%.
Description
Technical field
The invention belongs to axle steel field, more particularly to bullet train axletree structural alloy steel and its Technology for Heating Processing skill
Art field.
Background technology
Axletree is the vital part of vehicle to run part, subjects deadweight and the load of vehicle, runs and stops in vehicle
When also subject to impulsive force and brake force, be the three of railway construction stressing conditions are just increasingly complex at a high speed and in the state of heavy duty
Big vital part（Heavy rail, axletree and wheel）One of, train shaft belongs to the stepped axial workpiece of ultra-large type axial symmetry, and it is maximum straight
Footpath is 200mm or so, and length reaches 2200mm or so.
With putting into operation for China Express Railway, train speed is further improved, as railroad train critical component it
One high speed axletree is the important running part of railroad train, and its quality is directly connected to high-speed railway operation safety.Arrange at a high speed
Car axletree will ensure that under the use condition of defined, with enough securities, reliability and long life, this is just to car
Shaft material correlation technique proposes requirement higher.Bullet train bearing receives the various load from car body and track, its
In mainly rotoflector load and torsional load.Data according to statistics, in these failure modes, the failure that crackle causes is accounted for entirely
More than the 90% of portion's failure axletree, the axletree failure mode that crackle causes is eventually exhibited as fatigue fracture, and fatigue fracture is one and splits
Line is produced, extension causes the process of fracture, and its fatigue rupture directly jeopardizes transportation safety.Therefore, for Axle steel, mainly
It is to ensure its good intensity（Particularly bending composite fatigue intensity）And toughness.Influence the factor of steel fatigue behaviour main
Have：The cleanliness factor of steel, the composition of steel and tissue, the surface state of steel and dimensional effect, the corrosion resistance of steel etc..
Each railway developed country of the world all pays much attention to the research work of high speed axletree, from material, design, production, heat
Manage and constantly improve with aspects such as maintenances.Because the national conditions of various countries are different with technological standpoint, the axletree material of selection also not phase
Together.At present, domestic and international high speed axles steel is broadly divided into 3 classes：Carbon constructional quality steel, medium alloy constructional steel, high alloy knot
Structure steel.
（1）Carbon constructional quality steel.Japan uses common straightcarbon steel（S38C）Plus surface mid frequency induction hardening Technology for Heating Processing, phase
For adding modifier treatment Technology for Heating Processing using steel alloy than Europe, the Japanese high speed axletree cost of raw material is low, but heat treatment work
Skill is complicated, and heat treatment process parameter control accuracy requirement is high.
（2）Medium alloy constructional steel.European speed car shaft material uses medium alloy constructional steel mostly（Such as EA4T）, by using
Enhanced processing method improves the obdurability index of axletree, and Technology for Heating Processing is simple.But EA4T steel containing only Cr0.90 ~ 1.20%,
Mo0.15 ~ 0.30%, the quenching degree of steel is not very good, for the axletree of heavy in section, there is a problem of quenching impermeable, causes axletree
Section microscopic structure and performance are uneven, have impact on the overall performance index of high speed axletree.Chinese patent 201210555924.9
There is provided a kind of axle steel, its composition is C：0.38 ~ 0.44, Si：0.17 ~ 0.37, Mn：0.60 ~ 0.80, P：≤ 0.015, S：≤
0.010, Cr：0.90 ~ 1.20, Mo：0.15 ~ 0.30, Ni：0.10 ~ 0.25, V：0.07 ~ 0.2, Cu：0.08 ~ 0.2, Als：0.02~
0.05.Impermeable problem of quenching there is also using the heavy in section axletree of patent production.
（3）High alloy-structural steel.The European speed car shaft material in part is from high alloy-structural steels, steel such as 30NiCrMoV12
In contain Cr0.60 ~ 1.00%, Ni2.70 ~ 3.30%, Mo0.40 ~ 0.60%, V0.08 ~ 0.13%, such steel grade has many good qualities such as
Quenching degree is good, can oil quenching, deform that small, hardness is high, yield tensile ratio is high, corrosion resistance and good etc., but cost is higher.
The content of the invention
It is the problem for overcoming prior art to exist, the present invention provides a kind of heat treatment work of the bullet train of vanadium containing niobium axletree
Skill, using trace V, Nb, B and a small amount of Ni, Cu composite alloying principle, with reference to optimization of Heat Treatment Process, is being added on a small quantity
On the premise of this, quenching degree, corrosion resistance, fatigue resistance and the low-temperature flexibility of bullet train axles steel are significantly improved, and then
Overall performance, life-span and the security of bullet train axles steel are significantly improved, makes the production technology of bullet train axles steel
It is eased, efficient, so as to produce the bullet train axles steel of low-cost and high-performance.
In order to solve the above technical problems, the present invention provides a kind of Technology for Heating Processing of the bullet train of vanadium containing niobium axletree, it is described
The mass percent of the high-speed train axle chemical composition of vanadium containing niobium（Wt%）For：C：0.25 ~ 0.32, Si：0.15 ~ 0.40, Mn：
0.60 ~ 0.90, P：≤ 0.015, S：≤ 0.010, Cr：1.00 ~ 1.20, Mo：0.20 ~ 0.35, Ni：0.15 ~ 0.30, V：0.02~
0.04, Nb：0.015 ~ 0.040, Cu：0.10 ~ 0.30, B：0.0008 ~ 0.0050, Als：0.010 ~ 0.050, remaining is iron and residual
Remaining trace impurity；The Technology for Heating Processing of the bullet train of vanadium containing the niobium axletree is：（1）Normalizing：The vanadium containing niobium is arranged at a high speed
Car axletree is heated to 900 ~ 950 DEG C of insulations with the speed of 50 ~ 100 DEG C/h, and soaking time is calculated by 1.2 ~ 1.7min/mm, then
It is air cooled to room temperature；（2）Quenching：The bullet train axletree of vanadium containing niobium is heated to 880 ~ 930 DEG C with the speed of 50 ~ 100 DEG C/h
Insulation, soaking time is calculated by 1.5 ~ 2.0min/mm, then carries out water-cooled to room temperature；（3）Tempering：By the vanadium containing niobium at a high speed
Train axle is heated to 620 ~ 680 DEG C of insulations with the speed of 50 ~ 100 DEG C/h, and soaking time is calculated by 2~2.5min/mm, then
It is air cooled to room temperature.
Steel of the present invention has carried out composition design with polynary a small amount of alloying principle.
（1）Carbon：C is main intensified element, and the intensity, plasticity and toughness to steel have a significant impact, and C is too high to cause steel
The reduction of plasticity and toughness.To ensure the plasticity and toughness of steel, C content should be reduced suitably, and the intensity of loss is then by other alloys
Element and microalloy element make up.Consider, the C content scope of high speed axle steel should be advisable 0.25% ~ 0.32%.
（2）Silicon：Si is the most obvious element of solution strengthening effect, while being also to the maximum element of loss in toughness.Axletree
Hardness of steel level requirement is not too high, is considered from combination property, does not use Si to be controlled as main intensified element, therefore Si contents
In general relatively low level, it is advisable with no more than 0.4%, scope is considered 0.15% ~ 0.40%.
（3）Manganese：Mn mainly plays solution strengthening effect.From Mn unlike Si within 1.0% content, it has no to toughness
Infringement, but with the further increase of Mn contents, the toughness of steel is gradually reduced.Therefore high speed axle steel designs Mn contents not surpass
Cross 1.0% to be advisable, range-controllable system is 0.60% ~ 0.90%.
（4）Chromium：Cr can increase the quenching degree of steel, promote to obtain more uniform in workpiece whole cross section after quenching and tempering
Tissue.Range-controllable system is 0.90% ~ 1.20%.
（5）Molybdenum：Mo can significantly improve the quenching degree and heat resistance of steel, prevent temper brittleness；Meanwhile, Mo can make steel
Crystal grain refinement, improves the obdurability of steel, but Mo's is relatively costly.Consider, range-controllable system is 0.15% ~ 0.30%.
（6）Nickel：Ni has the tissue of refinement steel, the effect of the cryogenic property of improvement steel, and is quenched with solution strengthening, raising
Permeability is acted on, but its is expensive.Consider, range-controllable system is 0.15 ~ 0.30%.
（7）Copper：Cu is similar to Ni in terms of solution strengthening, raising quenching degree；Meanwhile, add copper also to improve steel in steel
Anti-fatigue performance because tiny Cu precipitations have blocked the formation of the initial stage vein texture of fatigue, and copper is separated out
Thing has good plasticity, can hinder the extension of fatigue crack, so as to improve the fatigue strength of steel；In addition, Cu also have it is certain
The effect of steel corrosion resistance is improved, it is to be remarkably improved its corrosion resistance that 0.1%Cu is added in steel.But Cu too high levels, steel is in heating rolling
Or easily cause hot-short in forging process.Consider, range-controllable system is 0.15 ~ 0.30%.
（8）Niobium：Nb is mainly shown as crystal grain refinement, precipitation strength and phase transformation strengthening to the Strengthening and Toughening effect of axle steel.Nb
To replace solute atoms presence in steel, Nb atomic ratio iron atoms size is big, and the segregation easily on dislocation line is produced to dislocation climb
Strong effect of dragging, is suppressed Recrystallization nucleation, has strong interception to recrystallization, improves austenite
Recrystallization temperature, so as to reach the purpose of fining austenite grains, crystal grain refinement can not only improve the obdurability of steel, Er Qiegai
The cryogenic property of kind steel.But its is expensive.Consider, the range-controllable system of Nb is 0.015% ~ 0.040%.
（9）Vanadium：V is one of strong carbonitride-forming elements.Addition trace V can produce significant precipitation strength to make
With simultaneously because its distinctive Grain refinement, can make steel keep fine grain structure, so as to compensate for due to precipitation strength
The loss of the plasticity and toughness brought, it is ensured that steel has good comprehensive mechanical property；Meanwhile, V can improve steel belt roof bolt
Stability, while improving the impact flexibility and temper brittleness of steel.But its is expensive.Consider, the range-controllable system of V exists
0.02%~0.04%。
（10）Boron：It is micro when containing in steel（0.0008 ~ 0.005%）During boron, the quenching degree of steel can be significantly improved, right
In the medium carbon structural alloy steel that C content is 0.25 ~ 0.32%, plus its maximum through hardening diameter can improve more than 50% after boron.For big
Alloy axletree structural steel in section, there is a problem of quenching impermeable, cause axletree section microscopic structure and performance uneven, influence
The overall performance index of high speed axletree, it is therefore desirable to by boron alloyed further improve its quenching degree.Meanwhile, boron alloy
Change low cost, and boron influences very little to the quenching crack susceptibility of steel.
The bullet train axles steel technological process of production of vanadium containing niobium of the invention is：Electric arc furnaces or converter smelting → LF stoves refining
→ RH or VD vacuum outgas → continuous casting → heating strand stove heat → axle blank rolling → axle blank forging → blank axletree is rough turn
The neat end face processing → normalizing of → axletree+quenching+high tempering heat treatment → axletree outer circle finish turning processing → axletree internal bore boring adds
Work → cylindricalo grinding → flaw detection.
Crucial Technology for Heating Processing step of the invention is as follows：
（1）Normalizing：By maximum gauge be 200mm or so, length up to 2200mm or so the bullet train axletree of vanadium containing niobium with
The speed of 50 ~ 100 DEG C/h is heated to 900 ~ 950 DEG C of insulations, and soaking time is calculated by 1.2 ~ 1.7min/mm, is then air cooled to room
Temperature.Crystal grain is not only refined after normalizing, and has improved the inhomogeneities of tissue, be that subsequent finished heat treatment carries out group
Knit preparation.
（2）Quenching：By maximum gauge be 200mm or so, length up to 2200mm or so the bullet train axletree of vanadium containing niobium with
The speed of 50 ~ 100 DEG C/h is heated to 880 ~ 930 DEG C of insulations, and soaking time is calculated by 1.5 ~ 2.0min/mm, then carries out water-cooled
To room temperature.
（3）Tempering：By maximum gauge be 200mm or so, length up to 2200mm or so the bullet train axletree of vanadium containing niobium with
The speed of 50 ~ 100 DEG C/h is heated to 620 ~ 680 DEG C of insulations, and soaking time is calculated by 2~2.5min/mm, is then air cooled to room
Temperature.By tempering, the metallographic structure of uniform fine and closely woven tempered sorbite+lower bainite can be obtained, so as to good tough modeling can be obtained
Property and suitable intensity index.
The bullet train of vanadium containing niobium produced using chemical composition of the invention, technological process and Technology for Heating Processing technological parameter
Axles steel, the vertical mixing coefficient for determining steel can reach：Rp0.2>=576MPa, Rm>=729MPa, A >=21%, Z >=68% ,-
40 DEG C of impacts of collision absorb work(Kv2>=185J, the fatigue limit R of surface SpecimensfL>=368MPa, surface carries notched specimen
Fatigue limit RfE>=296MPa, RfL/RfE≤1.24.The grain size of Axle steel is more than or equal to 8.5 grades.Bullet train axletree
Steel is organized as tempered sorbite+bainite after " normalizing+quenching+high tempering " heat treatment, wherein, axletree near surface tempering rope
, about 70 ~ 90%, tempered sorbite content is about 40 ~ 60% at the radius of axletree 1/2 for family name's body content.
Compared with prior art, the method have the advantages that：By former using trace V, Nb, B and a small amount of Ni, Cu composite alloying
Reason, with reference to optimization of Heat Treatment Process, with refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtains having uniform fine and closely woven rope
The high speed axletree structure of steel state of family name's body+lower bainite metallographic structure, have developed the speed car that yield strength is 450MPa grades
Axle steel, it is a small amount of increase cost on the premise of, significantly improve the quenching degree of bullet train axles steel, corrosion resistance, anti-tired
Labor and low-temperature flexibility, and then overall performance, life-span and the security of bullet train axles steel are significantly improved, make to arrange at a high speed
The production technology of car axles steel is eased, efficient, so as to produce the bullet train axles steel of low-cost and high-performance.
Specific embodiment
Following embodiment is used to illustrate the present invention, but protection scope of the present invention is not limited in following examples.
The bullet train axles steel technological process of production of vanadium containing niobium of the invention is：Electric arc furnaces or converter smelting → LF stoves refining
→ RH or VD vacuum outgas → continuous casting → heating strand stove heat → axle blank rolling → axle blank forging → blank axletree is rough turn
The neat end face processing → normalizing of → axletree+quenching+high tempering heat treatment → axletree outer circle finish turning processing → axletree internal bore boring adds
Work → cylindricalo grinding → flaw detection.
The melting chemical composition of the bullet train axles steel of vanadium containing niobium of the invention, main heat treatment process parameter and performance
Embodiment is as follows：
Technology for Heating Processing step and parameter are：
（1）Normalizing：900-950 DEG C is heated to the speed of 50 ~ 100 DEG C/h to be incubated, soaking time 240-340min, then
It is air cooled to room temperature.
（2）Quenching：880-930 DEG C is heated to the speed of 50 ~ 100 DEG C/h to be incubated, soaking time 300-400min, then
Water-cooled is to room temperature.
（3）Tempering：620-680 DEG C is heated to the speed of 50 ~ 100 DEG C/h to be incubated, soaking time 400-500min, then
It is air cooled to room temperature.
Maximum gauge be Φ 200mm, length up to 2200mm bullet train axletrees melting chemical composition mass percent
（Wt%）1 is shown in Table, the performance indications after bullet train axletree is heat-treated more than are shown in Table 2.
The melting chemical composition mass percent of the bullet train axletree steel of table 1（Wt%）
Performance indications after the heat treatment of the bullet train axletree of table 2
Performance indications after the heat treatment of the bullet train axletree of continued 2
Claims (1)
1. a kind of Technology for Heating Processing of the bullet train of vanadium containing niobium axletree, it is characterised in that the bullet train of vanadium containing the niobium axletree is used
The mass percent of the chemical composition of steel（Wt%）For：C：0.25 ~ 0.32, Si：0.15 ~ 0.40, Mn：0.60 ~ 0.90, P：≤
0.015, S：≤ 0.010, Cr：1.00 ~ 1.20, Mo：0.20 ~ 0.35, Ni：0.15 ~ 0.30, V：0.02 ~ 0.04, Nb：0.015~
0.040, Cu：0.10 ~ 0.30, B：0.0008 ~ 0.0050, Als：0.010 ~ 0.050, remaining is the trace impurity of iron and remnants；
The bullet train axletree of vanadium containing the niobium maximum gauge is 200mm, and length reaches 2200mm；The heat of the bullet train of vanadium containing the niobium axletree
Handling process is：
（1）Normalizing：The bullet train axletree of vanadium containing niobium is heated to 900 ~ 950 DEG C of insulations with the speed of 50 ~ 100 DEG C/h, is protected
The warm time is calculated by 1.2 ~ 1.7min/mm, is then air cooled to room temperature；
（2）Quenching：The bullet train axletree of vanadium containing niobium is heated to 880 ~ 930 DEG C of insulations with the speed of 50 ~ 100 DEG C/h, is protected
The warm time is calculated by 1.5 ~ 2.0min/mm, then carries out water-cooled to room temperature；
（3）Tempering：The bullet train axletree of vanadium containing niobium is heated to 620 ~ 680 DEG C of insulations with the speed of 50 ~ 100 DEG C/h, is protected
The warm time is calculated by 2~2.5min/mm, is then air cooled to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532094.7A CN104233109B (en) | 2014-10-11 | 2014-10-11 | Heat-treating process of high-speed train axle containing niobium and titanium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532094.7A CN104233109B (en) | 2014-10-11 | 2014-10-11 | Heat-treating process of high-speed train axle containing niobium and titanium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104233109A CN104233109A (en) | 2014-12-24 |
| CN104233109B true CN104233109B (en) | 2017-05-24 |
Family
ID=52221995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410532094.7A Active CN104233109B (en) | 2014-10-11 | 2014-10-11 | Heat-treating process of high-speed train axle containing niobium and titanium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104233109B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132800A (en) * | 2015-05-07 | 2015-12-09 | 马钢(集团)控股有限公司 | Car shaft steel and production method thereof |
| CN105821305B (en) * | 2016-06-07 | 2018-04-03 | 马鞍山钢铁股份有限公司 | A kind of axle of motor train unit steel heat treatment process of titanium containing niobium |
| CN105886904B (en) * | 2016-06-07 | 2018-02-16 | 马鞍山钢铁股份有限公司 | A kind of steel of axle of motor train unit containing vanadium, its production method and Technology for Heating Processing |
| CN105886940B (en) * | 2016-06-07 | 2018-04-24 | 马鞍山钢铁股份有限公司 | A kind of steel of axle of motor train unit containing vanadium and its heat treatment process |
| CN105821308A (en) * | 2016-06-07 | 2016-08-03 | 马鞍山钢铁股份有限公司 | Heat processing technology for vanadium and niobium-containing steel for motor train unit axle |
| CN105838988B (en) * | 2016-06-07 | 2018-05-18 | 马鞍山钢铁股份有限公司 | The steel of axle of motor train unit containing niobium and its heat treatment process |
| CN105838989B (en) * | 2016-06-07 | 2018-07-03 | 马鞍山钢铁股份有限公司 | A kind of steel heat treatment process of axle of motor train unit containing niobium |
| CN105821304B (en) * | 2016-06-07 | 2018-07-03 | 马鞍山钢铁股份有限公司 | A kind of axle of motor train unit steel of titanium containing niobium and its heat treatment process |
| CN105951000B (en) * | 2016-07-13 | 2018-04-20 | 马鞍山钢铁股份有限公司 | A kind of axle of motor train unit steel of niobium containing vanadium and its heat treatment process |
| CN108048757B (en) * | 2017-12-29 | 2019-07-05 | 中国铁道科学研究院金属及化学研究所 | A kind of axle steel and preparation method thereof for extremely frigid zones high-speed EMUs |
| CN111304541A (en) * | 2020-04-20 | 2020-06-19 | 安徽马钢和菱实业有限公司 | Niobium-vanadium composite microalloyed seamless steel tube for semitrailer axle and production method thereof |
| JPWO2022071262A1 (en) * | 2020-09-29 | 2022-04-07 | ||
| CN113025901A (en) * | 2021-03-03 | 2021-06-25 | 江苏联峰能源装备有限公司 | Steel for petroleum valve body and preparation method thereof |
| CN114058964A (en) * | 2021-11-30 | 2022-02-18 | 宝武集团马钢轨交材料科技有限公司 | Steel for high-speed axle and heat treatment method and production method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4895700A (en) * | 1988-03-10 | 1990-01-23 | Dana Corporation | Low grade material axle shaft |
| JP4288201B2 (en) * | 2003-09-05 | 2009-07-01 | 新日本製鐵株式会社 | Manufacturing method of automotive member having excellent hydrogen embrittlement resistance |
| CN101497968A (en) * | 2009-03-16 | 2009-08-05 | 江苏沙钢集团淮钢特钢有限公司 | Steel for microalloying lorry axle and technique for producing the same |
| CN102226253B (en) * | 2011-06-10 | 2013-03-20 | 钢铁研究总院 | Carburized bearing steel for high-speed railways and preparation method thereof |
| CN102876860B (en) * | 2012-10-11 | 2014-09-24 | 清华大学 | Heat treatment method of novel alloy steel hollow car axle material |
-
2014
- 2014-10-11 CN CN201410532094.7A patent/CN104233109B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104233109A (en) | 2014-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104233109B (en) | Heat-treating process of high-speed train axle containing niobium and titanium | |
| CN104372155B (en) | A kind of Technology for Heating Processing of the axletree of bullet train containing niobium | |
| CN102226253B (en) | Carburized bearing steel for high-speed railways and preparation method thereof | |
| CN105886904B (en) | A kind of steel of axle of motor train unit containing vanadium, its production method and Technology for Heating Processing | |
| CN106086678B (en) | High life bearing steel material and its processing method | |
| CN102618791B (en) | High strength and ductility oil casing with hydrogen sulfide corrosion resistance and manufacturing method for oil casing | |
| CN113234998B (en) | Nb-Ti microalloyed high temperature resistant carburized gear steel and manufacturing method thereof | |
| AU2018393178A1 (en) | Method for fabricating low-cost, short-production-cycle wear-resistant steel | |
| CN104233110A (en) | Steel for high-speed train axle containing niobium and titanium | |
| CN104233108A (en) | Heat-treating process of high-speed train axle containing niobium and titanium | |
| CN104294173A (en) | Niobium-containing steel for high-speed train axle | |
| CN104233107A (en) | Steel for high-speed train axle containing niobium and titanium | |
| CN105838988B (en) | The steel of axle of motor train unit containing niobium and its heat treatment process | |
| CN107988563A (en) | A kind of fine grain ultra-high strength and toughness high speed axle steel and its heat treatment method | |
| CN105821194B (en) | The axle of motor train unit steel heat treatment process of titanium containing niobium | |
| CN105821307B (en) | A kind of steel of axle of motor train unit containing niobium, its production method and Technology for Heating Processing | |
| CN104264066A (en) | Niobium-vanadium containing steel for high-speed train axle | |
| CN112063926B (en) | High-corrosion-resistance anti-fatigue steel for high-speed train axle containing niobium and having speed of 400 kilometers and heat treatment method thereof | |
| CN105951000B (en) | A kind of axle of motor train unit steel of niobium containing vanadium and its heat treatment process | |
| CN105861789B (en) | A kind of axle of motor train unit steel heat treatment process of niobium containing vanadium | |
| CN105886940B (en) | A kind of steel of axle of motor train unit containing vanadium and its heat treatment process | |
| CN105821304B (en) | A kind of axle of motor train unit steel of titanium containing niobium and its heat treatment process | |
| CN105821308A (en) | Heat processing technology for vanadium and niobium-containing steel for motor train unit axle | |
| CN105385952A (en) | Wheel steel for high-speed railway train and thermal treatment process of wheel steel | |
| CN105838989B (en) | A kind of steel heat treatment process of axle of motor train unit containing niobium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |