CN101914729A - Niobium-titanium composite beam steel of heavy truck and preparation method thereof - Google Patents
Niobium-titanium composite beam steel of heavy truck and preparation method thereof Download PDFInfo
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- CN101914729A CN101914729A CN 201010242976 CN201010242976A CN101914729A CN 101914729 A CN101914729 A CN 101914729A CN 201010242976 CN201010242976 CN 201010242976 CN 201010242976 A CN201010242976 A CN 201010242976A CN 101914729 A CN101914729 A CN 101914729A
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Abstract
The invention provides niobium-titanium composite beam steel of a heavy truck and a preparation method thereof. The beam steel comprises the following chemical components: 0.06-0.12wt% of C, 0.10-0.30wt% of Si, 1.45-1.65wt% of Mn, 0.030-0.060wt% of Nb, 0.025-0.045wt% of Ti, not more than 0.015wt% of S, not more than 0.020wt% of P and the balance Fe and inevitable impurities. The beam steel is prepared by the steps of heating, rough rolling, finish rolling and reeling. In the method, Nb and Ti in the steel can fully become solution in the austenite during heating; during rolling and rolling intervals, the dynamic recrystallization and static recrystallization processes are restrained through precipitation of NbC and NbN to control the crystalline dimension and the shape of the austenite before phase inversion, refine the ferrite crystalline grains and obviously improve the strength of the steel strips; and precipitation strength is generated and good ductility and toughness are maintained through precipitation of TiN. The beam steel has high load-carrying capacity and is suitable for manufacturing beams of heavy trucks.
Description
Technical field
The present invention relates to niobium-titanium composite beam steel of heavy truck and preparation method thereof, belong to metal material processing and field shaping technique.
Background technology
Automotive frame is the main load bearing component of load-carrying vehicle, is almost carrying all wts of goods, and therefore, the quality of beam steel directly affects the work-ing life and the traffic safety of car load.Automotive frame steel plate is mainly used in the vehicle frame of making automobile, comprises longeron, crossbeam and other structural parts of bogie and passenger car, is the steel grade that demand is big in the vehicle structure steel plate, performance index are had relatively high expectations.When automotive frame is made, need carry out the punching press distortion to automotive frame steel plate, to form automobile longitudinal girder, the crossbeam of different size.Because automotive frame will stand the impact of various repeated loads under steam, therefore, require the beam steel panel material to possess higher intensity, good plasticity and certain deformation ability, to improve carrying capacity and the anti-fatigue performance of automobile in shipping or passenger traffic.Along with the develop rapidly of national economy, transportation and automotive industry also are rapidly developed, and the sharp increase of logistics capacity requires transportation means towards large scale development.Therefore, development and exploitation have higher-strength, and the 610MPa level beam steel of good fatigue resistance, press formability, weldability has become current important topic.
Summary of the invention
For satisfying the manufacturing requirement of heavy-duty car, the invention provides a kind of niobium-titanium composite beam steel of heavy truck.
In addition, the present invention also provides the preparation method of above-mentioned niobium-titanium composite beam steel of heavy truck.
Niobium-titanium composite beam steel of heavy truck provided by the invention has the chemical ingredients of following mass ratio:
C：0.06～0.12wt％
Si：0.10～0.30wt％
Mn：1.45～1.65wt％
Nb：0.030～0.060wt％
Ti：0.025～0.045wt％
S：≤0.015wt％
P：≤0.020wt％
All the other are Fe and inevitable impurity.
Preparation method's process the following step of niobium-titanium composite beam steel of heavy truck provided by the invention:
A, the steel billet that chemical ingredients is following are heated to 1200～1220 ℃:
C：0.06～0.12wt％
Si：0.10～0.30wt％
Mn：1.45～1.65wt％
Nb：0.030～0.060wt％
Ti：0.025～0.045wt％
S：≤0.015wt％
P：≤0.020wt％
All the other are Fe and inevitable impurity;
B, it is high temperature billet steel splash de-scaling 8～10 seconds of 140～190bar high pressure water to steps A with pressure;
C, send milling train with the descaling steel billet of step B, at start rolling temperature is 1060～1150 ℃, and roll speed is under the condition of 1.4～3.6m/s, back and forth roughing 3～4 passages, and the time that postpones 4～8 seconds after last a time roughing is descended the roughing of a time again, gets the roughing steel band;
D, be under the condition of 4.5～6.0m/s in roll speed with the roughing steel band of step C, reciprocal finish rolling 2～3 passages, and go up the time that postpones 4～6 seconds after a time finish rolling and descend the finish rolling of a time again, the control finishing temperature is 810～850 ℃, gets the finish rolling steel band;
E, the finish rolling steel band of step D is cooled to 560～620 ℃ coiling temperature with 14～20 ℃/s speed of cooling on the laminar flow cooling section, send ground volume machine to batch rolling, natural air cooling promptly obtains niobium-titanium composite beam steel of heavy truck to room temperature afterwards.
The steel billet of described A step is that the method for making steel with prior art obtains, and Nb wherein, Ti and other chemical composition content add in steelmaking process, control and obtain.
The steel billet heating of described A step is finished in normal reheating furnace, by heating Nb, Ti element in the steel fully is solid-solubilized in the austenite.
The finish rolling of the roughing of described B step, C step is all finished on same two-shipper stand reversible Steckel mill, with in the operation of rolling and in rolling intermittence, by separating out of NbC, NbN, suppress dynamic recrystallization and static recrystallization process, change preceding austenitic grain-size and shape mutually with control, the refinement ferrite crystal grain improves toughness; By the separating out of TiN, produce precipitation strength again, improve toughness.
The niobium-titanium composite beam steel of heavy truck that adopts such scheme of the present invention to produce has the following advantages:
1, niobium-titanium composite beam steel of heavy truck provided by the invention has higher intensity, can reduce vehicle weight, and then reduces fuel oil consumption, reaches economical with materials, the purpose of energy-saving and emission-reduction.
2, method provided by the invention, can in heat-processed, make Nb, Ti element in the steel fully be solid-solubilized in the austenite, in the operation of rolling and in rolling intermittence,, suppress dynamic recrystallization and static recrystallization process again by separating out of NbC, NbN, change preceding austenitic grain-size and shape mutually with control, the refinement ferrite crystal grain obviously improves the intensity of steel band, again separating out by TiN, produce precipitation strength, keep plasticity and toughness preferably.
3, the present invention's niobium-titanium composite beam steel of heavy truck technologic mechanics stable performance of producing has higher intensity, formability and fatigue resistance preferably, and loading capacity is big, is applicable to make the heavy truck crossbeam.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1
A, slab caster is watered the composition that casts out be: C:0.06wt%, Si:0.12wt%, Mn:1.48wt%, Nb:0.031wt%, Ti:0.027wt%, S:0.010wt%, P:0.016wt%, all the other are the steel billet of Fe and inevitable impurity, send in the normal reheating furnace and heated 120 minutes, process furnace soaking zone temperature is 1240 ℃, when making the base temperature reach 1200 ℃, come out of the stove after the insulation routinely, get high temperature billet steel;
B, be that the high pressure water of 140bar is respectively to 10 seconds of positive and negative splash de-scaling of the high temperature billet steel of steps A with pressure;
C, the descaling steel billet of step B is sent into two-shipper stand reversible Steckel mill, the control start rolling temperature is 1060 ℃, make steel billet on two frames of two-shipper stand reversible Steckel mill, carry out the roughing of 4 passages with the roll speed of 1.4m/s, after wherein each passage has been rolled, the time that postpones 4 seconds enters down the rolling of a time again, gets the roughing steel band;
D, the roughing steel band of step C carried out the finish rolling of 3 passages with the roll speed of 4.5m/s on two frames of same two-shipper stand reversible Steckel mill, after wherein each passage has been rolled, the time that postpones 4 seconds enters down the rolling of a time again, open roll water quench roll in the operation of rolling routinely, the control finishing temperature is 810 ℃, and obtaining thickness is the finish rolling beam steel of 8.0mm;
E, the finish rolling steel band of D step is entered the laminar flow cooling section force cooling, be cooled to 560 ℃ coiling temperature with the speed of cooling of 17 ℃/s after, send into reeling machine and batch bundling, natural air cooling is to room temperature then, can obtain the compound 610MPa level of niobium titanium beam steel, the chemical ingredients of this steel is: C:C:0.06wt%, Si:0.12wt%, Mn:1.48wt%, Nb:0.031wt%, Ti:0.027wt%, S:0.010wt%, P:0.016wt%, all the other are Fe and inevitable impurity.
Embodiment 2
A, slab caster is watered the steel billet heat that casts out send in the heater for rolling steel, wherein, the steel billet composition is C:0.10wt%, Si:0.28wt%, Mn:1.59wt%, Nb:0.047wt%, Ti:0.042wt%, S:0.010wt%, P:0.014wt%, all the other are Fe and inevitable impurity; Process furnace heating 120 minutes, process furnace soaking zone furnace temperature are 1240 ℃, when making the base temperature reach 1210 ℃, come out of the stove after the insulation routinely, high temperature billet steel;
B, be that the high pressure water of 190bar is respectively to 8 seconds of positive and negative splash de-scaling of the high temperature billet steel of steps A with pressure;
C, the descaling steel billet of step B is sent into two-shipper stand reversible Steckel mill, the control start rolling temperature is 1150 ℃, make steel billet on two frames of two-shipper stand reversible Steckel mill, carry out the roughing of 3 passages with the roll speed of 3.6m/s, after wherein each passage has been rolled, the time that postpones 8 seconds enters down the rolling of a time again, gets the roughing steel band;
D, the roughing steel band of step C carried out the finish rolling of 2 passages with the roll speed of 6.0m/s on two frames of same two-shipper stand reversible Steckel mill, after wherein each passage has been rolled, the time that postpones 6 seconds enters down the rolling of a time again, open roll water quench roll in the operation of rolling routinely, the control finishing temperature is 850 ℃, and obtaining thickness is the finish rolling beam steel of 8.0mm;
E, the finish rolling steel band of D step is entered the laminar flow cooling section force cooling, be cooled to 620 ℃ coiling temperature with the speed of cooling of 20 ℃/s after, send that reeling machine batches, bundling, natural air cooling is to room temperature then, can obtain the compound 610MPa level of niobium titanium beam steel, the chemical ingredients of this steel is C:0.10wt%, Si:0.28wt%, Mn:1.59wt%, Nb:0.047wt%, Ti:0.042wt%, S:0.010wt%, P:0.014wt%, all the other are Fe and inevitable impurity;
Embodiment 3
A, slab caster is watered the steel billet that casts out send into heater for rolling steel, the steel billet composition is C:0.12wt%, Si:0.39wt%, Mn:1.65wt%, Nb:0.055wt%, Ti:0.044wt%, S:0.006wt%, P:0.010wt%, all the other are Fe and inevitable impurity.Heating is 240 minutes in the external process furnace of steel billet, and process furnace soaking zone furnace temperature is 1260 ℃, when the base temperature is heated to 1220 ℃, comes out of the stove after the insulation routinely, gets high temperature billet steel;
B, be that the high pressure water of 171bar is respectively to 9 seconds of positive and negative splash de-scaling of the high temperature billet steel of steps A with pressure;
C, the descaling steel billet of step B is sent into two-shipper stand reversible Steckel mill, the control start rolling temperature is 1090 ℃, make steel billet on two frames of two-shipper stand reversible Steckel mill, carry out the roughing of 4 passages with the roll speed of 2.0m/s, after wherein each passage has been rolled, the time that postpones 6 seconds enters down the rolling of a time again, gets the roughing steel band;
D, the roughing steel band of step C carried out the finish rolling of 3 passages with the roll speed of 5.0m/s on two frames of same two-shipper stand reversible Steckel mill, after wherein each passage has been rolled, the times that second is spent in delay 5 enter down the rolling of a time again, open roll water quench roll in the operation of rolling routinely, the control finishing temperature is 830 ℃, and obtaining thickness is the finish rolling beam steel of 8.0mm;
E, the finish rolling steel band of D step is entered the laminar flow cooling section force cooling, be cooled to 600 ℃ coiling temperature with the speed of cooling of 14.5 ℃/s after, send that reeling machine batches, bundling, natural air cooling is to room temperature then, can obtain the compound 610MPa level of niobium titanium beam steel, the chemical ingredients of this steel is: C:0.12wt%, Si:0.39wt%, Mn:1.65wt%, Nb:0.055wt%, Ti:0.044wt%, S:0.006wt%, P:0.010wt%, all the other are Fe and inevitable impurity.
Claims (2)
1. niobium-titanium composite beam steel of heavy truck is characterized in that having the chemical ingredients of following mass ratio:
C：0.06～0.12wt％
Si：0.10～0.30wt％
Mn：1.45～1.65wt％
Nb：0.030～0.060wt％
Ti：0.025～0.045wt％
S≤0.015wt％
P≤0.020wt％
All the other are Fe and inevitable impurity.
2. the preparation method of a niobium-titanium composite beam steel of heavy truck as claimed in claim 1 is characterized in that through following process steps:
A, the steel billet that chemical ingredients is following are heated to 1220～1260 ℃:
C：0.06～0.12wt％
Si：0.10～0.30wt％
Mn：1.45～1.65wt％
Nb：0.030～0.060wt％
Ti：0.025～0.045wt％
S≤0.015wt％
P≤0.020wt％
All the other are Fe and inevitable impurity;
B, it is high temperature billet steel splash de-scaling 8～10 seconds of 140～190bar high pressure water to steps A with pressure;
C, send milling train with the descaling steel billet of step B, at start rolling temperature is 1060～1150 ℃, and roll speed is under the condition of 1.4～3.6m/s, back and forth roughing 3～4 passages, and the time that postpones 4～8 seconds after last a time roughing is descended the roughing of a time again, gets the roughing steel band;
D, be under the condition of 4.5～6.0m/s in roll speed with the roughing steel band of step C, reciprocal finish rolling 2～3 passages, and go up the time that postpones 4～6 seconds after a time finish rolling and descend the finish rolling of a time again, the control finishing temperature is 810～850 ℃, gets the finish rolling steel band;
E, with the finish rolling steel band of step D be cooled to 560～620 ℃ coiling temperature on the laminar flow cooling section with 14～20 ℃/s speed of cooling after, send ground volume machine to batch rolling, natural air cooling promptly obtains niobium-titanium composite beam steel of heavy truck to room temperature afterwards.
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| CN 201010242976 CN101914729A (en) | 2010-08-03 | 2010-08-03 | Niobium-titanium composite beam steel of heavy truck and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023111A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN110331344A (en) * | 2019-07-15 | 2019-10-15 | 武汉钢铁有限公司 | A kind of Rm >=600MPa beam steel that strength character is stable and production method |
| CN111088462A (en) * | 2020-01-06 | 2020-05-01 | 柳州钢铁股份有限公司 | Production method of hot-rolled steel strip for 610 MPa-grade automobile frame |
| CN111172456A (en) * | 2020-01-06 | 2020-05-19 | 柳州钢铁股份有限公司 | 610 MPa-grade hot-rolled steel strip for automobile beam |
| CN115627415A (en) * | 2022-09-28 | 2023-01-20 | 山东钢铁集团日照有限公司 | Low-cost thick-specification high-strength hot-rolled strip steel for pipe piles and preparation method thereof |
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| CN1824816A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | Steel for extended automobile crossbeam and mfg, method thereof |
| CN101565794A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | High-strength hot rolling automotive frame steel plate and manufacturing method thereof |
| CN101624676A (en) * | 2009-07-15 | 2010-01-13 | 东北大学 | Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof |
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2010
- 2010-08-03 CN CN 201010242976 patent/CN101914729A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1824816A (en) * | 2005-02-25 | 2006-08-30 | 宝钢集团上海梅山有限公司 | Steel for extended automobile crossbeam and mfg, method thereof |
| CN101565794A (en) * | 2008-04-22 | 2009-10-28 | 宝山钢铁股份有限公司 | High-strength hot rolling automotive frame steel plate and manufacturing method thereof |
| CN101624676A (en) * | 2009-07-15 | 2010-01-13 | 东北大学 | Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023111A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN109023111B (en) * | 2018-09-26 | 2020-04-07 | 武汉钢铁有限公司 | 1000 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof |
| CN110331344A (en) * | 2019-07-15 | 2019-10-15 | 武汉钢铁有限公司 | A kind of Rm >=600MPa beam steel that strength character is stable and production method |
| CN110331344B (en) * | 2019-07-15 | 2021-04-06 | 武汉钢铁有限公司 | Automobile girder steel with stable strength performance and Rm of more than or equal to 600MPa and production method thereof |
| CN111088462A (en) * | 2020-01-06 | 2020-05-01 | 柳州钢铁股份有限公司 | Production method of hot-rolled steel strip for 610 MPa-grade automobile frame |
| CN111172456A (en) * | 2020-01-06 | 2020-05-19 | 柳州钢铁股份有限公司 | 610 MPa-grade hot-rolled steel strip for automobile beam |
| CN111088462B (en) * | 2020-01-06 | 2021-06-22 | 柳州钢铁股份有限公司 | Production method of hot-rolled steel strip for 610 MPa-grade automobile frame |
| CN115627415A (en) * | 2022-09-28 | 2023-01-20 | 山东钢铁集团日照有限公司 | Low-cost thick-specification high-strength hot-rolled strip steel for pipe piles and preparation method thereof |
| CN115627415B (en) * | 2022-09-28 | 2024-04-16 | 山东钢铁集团日照有限公司 | Hot-rolled strip steel for low-cost thick-specification high-strength tubular pile and preparation method thereof |
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Application publication date: 20101215 |