CN109504898A - The effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3 ~ 8mm yield strength and its production method - Google Patents

The effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3 ~ 8mm yield strength and its production method Download PDF

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Publication number
CN109504898A
CN109504898A CN201811335980.5A CN201811335980A CN109504898A CN 109504898 A CN109504898 A CN 109504898A CN 201811335980 A CN201811335980 A CN 201811335980A CN 109504898 A CN109504898 A CN 109504898A
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Prior art keywords
hot rolled
finish rolling
rolling
temperature
cooling
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CN201811335980.5A
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Chinese (zh)
Inventor
张秀飞
郭冬青
魏淼
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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Priority to CN201811335980.5A priority Critical patent/CN109504898A/en
Publication of CN109504898A publication Critical patent/CN109504898A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/005Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

Abstract

The present invention relates to the effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3~8mm yield strength and its production methods.Institute's hot rolled strip chemical component is by mass percentage are as follows: C:0.06~0.08%, Si:0.05~0.15%, Mn:1.50~1.70%, P :≤0.015%, S :≤0.010%, Alt:0.020~0.060%, Nb:0.025~0.035%, Ti:0.070~0.090%, Ca:0.0010~0.0030%, Ce:0.0005~0.0020%, surplus are iron and inevitable impurity.The chemical component of the steel band contains trace rare-earth Ce, microscopic structure is ferrite and pearlite, about 12 grades of grain size, with high-intensitive, good cold machine-shaping performance and welding performance, suitable for materials such as vehicle structure steel, mechanical property and processing performance meet the technical requirements of Automobile shaft tube steel.

Description

The effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3~8mm yield strength and its Production method
Technical field
The present invention relates to iron and steel smelting technology fields, in particular to 700MPa grades of vehicle transmissions of one kind 3~8mm yield strength Central siphon hot rolled strip and its production method.
Background technique
Hot rolled strip by open it is flat, cut into plate, be processed into vehicle transmission central siphon by vertical masonry joint resistance welding technology, then Truck drive shaft is processed into be assembled on automobile.Transmission shaft is an important component in automobile manufacture, and function mainly will The power of automobile engine is transmitted to the rear semiaxis of automobile axle, then drives wheel by rear semiaxis, so that the traveling of automobile is driven, It is the power transmission of automobile.Automobile is in the process of moving, different with pavement behavior, magnitude of load, travel speed, transmission The torsion and rotation speed that axis is subject to are also different, and therefore, to guarantee the safety in vehicle traveling process, truck drive shaft is effective Steel will not only have good processability and welding performance, have certain intensity work to guarantee, the toughness and shock resistance that also had Ability.The requirement of the effective hot rolled strip mechanical property of 700MPa grades of truck drive shafts of 3~8mm yield strength and processing performance is shown in Table 1。
The effective hot rolled strip mechanical property of table 700MPa grades of truck drive shafts of 1 yield strength and processing performance
Studies have shown that trace rare-earth can play the role of inclusion conditioning in steel, field trash is reduced to the unfavorable shadow of steel It rings, improving welding property alleviates the Delayed hydride cracking phenomenon of high-strength steel, improves the low-temperature flexibility of steel.Trace rare-earth can reduce The illeffects of low-melting-point metal Sn, Pb, As, Sb, Bi in steel etc. are conducive to the toughness plasticity for improving steel.Transmission shaft tube steel Obdurability, fatigue behaviour and stability are required relatively high.It is to promote having for steel comprehensive performance that trace rare-earth, which is added, Effect means, but how stable addition trace rare-earth is still a technical problem in steelmaking process.
Summary of the invention
In view of this, the present invention provides 700MPa grades of transmission shaft tube hot rolled strips of one kind 3~8mm yield strength and its life Production method.
The present invention provides one kind 3~8mm yield strength the 700MPa grades of effective hot rolled strips of truck drive shaft, the chemistry of steel band Ingredient is by mass percentage are as follows: C:0.06~0.08%, Si:0.05~0.15%, Mn:1.50~1.70%, P :≤ 0.015%, S :≤0.010%, Alt:0.020~0.060%, Nb:0.025~0.035%, Ti:0.070~0.090%, Ca:0.0010~0.0030%, Ce:0.0005~0.0020%, surplus are iron and inevitable impurity.
The present invention also provides a kind of above-mentioned effective hot rolled strip production methods of truck drive shaft comprising:
Step 1): smelting continuous casting, successively includes: molten iron pretreatment, converter smelting, LF refining, RH application of vacuum and casting Machine continuous casting;Wherein, wherein Ce is added in the form of Ce-Fe alloy, is added after RH application of vacuum 8mim by feed bin;
Step 2): continuous casting billet heating, control time inside furnace are 180~240min, and tapping temperature is 1230~1280 DEG C;
Step 3): rolling comprising including roughing and finish rolling;Wherein, 1010~1050 DEG C of the start rolling temperature of the finish rolling, The finishing temperature of the finish rolling is 850~880 DEG C;
Step 4): cooling down and batch, and described cooling using section cooling equipment, cooling velocity is 25~35 DEG C/s, is batched Temperature is 600~640 DEG C.
Further, the roughing uses the 2 machine frame rolling mill roughing of 3+3 mode, and the finish rolling uses 7 rack continuously variable crowns Milling train finish rolling.
Based on above technical scheme, the present invention provides one kind 700MPa grades of transmission shaft tube hot-rolled steels of 3~8mm yield strength Band and its production method, the chemical component of the hot rolled strip contain 0.0005~0.0020%Ce, and microscopic structure is ferrite+pearl Body of light, has high-intensitive, good cold machine-shaping performance and welding performance, is suitable for vehicle transmission central siphon by about 12 grades of grain size Equal materials, mechanical property and processing performance meet yield strength >=650MPa, and 700~850MPa of tensile strength, elongation percentage A >= 16%, the requirement of clod wash d=2a.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described.
Fig. 1 is the typical microstructures figure of steel band prepared by the present embodiment 1.
Specific embodiment
The invention discloses 700MPa grades of transmission shaft tube hot rolled strips of one kind 3~8mm yield strength and its production method, Those skilled in the art can use for reference present disclosure, be suitably modified realization of process parameters.In particular, it should be pointed out that all similar Replacement and change it is apparent to those skilled in the art, they are considered as being included in the present invention.The present invention Method and application be described by preferred embodiment, related personnel can obviously not depart from the content of present invention, essence Method described herein and application are modified or appropriate changes and combinations in mind and range, carry out implementation and application skill of the present invention Art.
In one embodiment of the present of invention mode, the present invention provides one kind 700MPa grades of transmission shafts of 3~8mm yield strength Effective hot rolled strip, which is characterized in that its chemical component is by mass percentage are as follows:
C:0.06~0.08%, Si:0.05~0.15%, Mn:1.50~1.70%, P :≤0.015%, S :≤ 0.010%, Alt:0.020~0.060%, Nb:0.025~0.035%, Ti:0.070~0.090%, Ca:0.0010~ 0.0030%, Ce:0.0005~0.0020%, surplus are iron and inevitable impurity.
In yet another embodiment of the present invention, the present invention also provides a kind of production method of above-mentioned hot rolling wheel steel, Comprising:
Step 1): smelting continuous casting, successively includes: molten iron pretreatment, converter smelting, LF refining, RH application of vacuum and casting Machine continuous casting;Wherein, wherein Ce is added in the form of Ce-Fe alloy, is added after RH application of vacuum 8mim by feed bin;
Step 2): continuous casting billet heating, control time inside furnace are 180~240min, and tapping temperature is 1230~1280 DEG C;
Step 3): rolling comprising including roughing and finish rolling;Wherein, 1010~1050 DEG C of the start rolling temperature of the finish rolling, The finishing temperature of the finish rolling is 850~880 DEG C;
Step 4): cooling down and batch, and described cooling using section cooling equipment, cooling velocity is 25~35 DEG C/s, is batched Temperature is 600~640 DEG C.In above-mentioned technique, Ce-Fe alloy, conversion is added by control RH application of vacuum process in smelting procedure Additional amount at pure Ce is 0.0005~0.0020%.It is as follows for casting machine molten steel composition: C:0.06~0.08%, Si:0.05 ~0.15%, Mn:1.50~1.70%, P :≤0.015%, S :≤0.010%, Alt:0.020~0.060%, Nb:0.025 ~0.035%, Ti:0.070~0.090%, Ca:0.0010~0.0030%, Ce:0.0005~0.0020%, Ce:0.0005 ~0.0020%, surplus is iron and inevitable impurity.
In rolling mill practice, the roughing preferably uses the 2 machine frame rolling mill roughing of 3+3 mode, and the finish rolling preferably uses 7 racks Continuously variable crown (Continuously variable crown, cvc) milling train finish rolling.
In a preferred embodiment of the invention, the present inventor is for preparing with a thickness of the steel band of 4.5mm, comparison hair After present RH application of vacuum 8min by feed bin addition trace rare earth compared to after RH application of vacuum different time be added Trace rare earth can significantly improve the overall performance for the steel band being prepared, and comparing result see the table below 2.
The effect of trace rare earth Ce is added in different time points after table 2:RH is vacuum-treated
The present invention provides 700MPa grades of transmission shaft tube hot rolled strips of one kind 3~8mm yield strength and its production method, should The chemical component of hot rolled strip contains 0.0005~0.0020%Ce, and microscopic structure is ferrite+pearlite, grain size about 12 Grade has high-intensitive, good cold machine-shaping performance and welding performance, is suitable for materials, mechanical property and the works such as transmission shaft tube Skill performance meets yield strength >=650MPa, 700~850MPa of tensile strength, elongation percentage A >=16%, the requirement of clod wash d=2a.
Below with reference to embodiment, the present invention is further explained:
Embodiment 1
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting The whole Argon of smelting, steel scrap addition converter, 1640 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace Refining, refines temperature >=1560 DEG C in place, and molten steel carries out RH application of vacuum after LF external refining, and Ce- is added after being vacuum-treated 8min Fe alloy.Sheet billet continuous casting is carried out by smelting chemical ingredient shown in table 2, the degree of superheat is 20 DEG C, carries out slab cleaning later, delays Cold and continuous casting billet quality inspection.Slab heating temperature is 1270 DEG C, and time of heating is 220min, by the slab after heating into Horizontal high voltage water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1050 DEG C, finish rolling finishing temperature is 870 DEG C, finished product thickness 3.5mm.Section cooling is cooling using front, 30 DEG C/s of cooling velocity, steel band Temperature is reduced to 640 DEG C and is batched.Finally carry out product quality detection.Fig. 1 is that the typical case of steel band manufactured in the present embodiment is aobvious Micro-assembly robot figure.It can be seen that microscopic structure be ferrite+pearlite, about 12 grades of grain size.
Embodiment 2
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting The whole Argon of smelting, steel scrap addition converter, 1630 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace Refining, refines temperature >=1560 DEG C in place, and molten steel carries out RH application of vacuum after LF external refining, and Ce- is added after being vacuum-treated 8min Fe alloy.Sheet billet continuous casting is carried out by smelting chemical ingredient shown in table 2, the degree of superheat is 30 DEG C, carries out slab cleaning later, delays Cold and continuous casting billet quality inspection.Slab heating temperature is 1250 DEG C, and time of heating is 235min, by the slab after heating into Horizontal high voltage water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.Finish rolling start rolling temperature 1040 DEG C, finish rolling finishing temperature is 860 DEG C, finished product thickness 4.5mm.Section cooling is cooling using front, 32 DEG C/s of cooling velocity, steel band Temperature is reduced to 620 DEG C and is batched.Finally carry out product quality detection.
Embodiment 3
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting The whole Argon of smelting, steel scrap addition converter, 1650 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace Refining, refines temperature >=1560 DEG C in place, and molten steel carries out RH application of vacuum after LF external refining, and Ce- is added after being vacuum-treated 8min Fe alloy.By smelting chemical ingredient sheet billet continuous casting shown in table 2, the degree of superheat is 26 DEG C, carries out slab cleaning, slow cooling later, and Continuous casting billet quality inspection.Slab heating temperature is 1230 DEG C, and the time of heating is 240min, and the slab after heating is carried out high pressure Water dephosphorization.By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling Finishing temperature is 860 DEG C, finished product thickness 6.0mm.Section cooling is cooling using front, 35 DEG C/s of cooling velocity, temperature of steel strips drop It is batched as low as 600 DEG C.Finally carry out product quality detection.
The chemical component of above-described embodiment coil of strip is listed in table 3.
The chemical component (wt%) of 3 1-3 of the embodiment of the present invention of table
Mechanical properties test is carried out to the coil of strip of the embodiment of the present invention 1~3, inspection result is shown in Table 4.
The mechanical property of the coil of strip of 4 embodiment of the present invention 1~3 of table
From the data in table 4, it can be seen that 700MPa grades of transmission shaft tube hot-rolled steels of a kind of 3~8mm yield strength provided by the invention Band, mechanical property and processing performance meet yield strength >=650MPa, 700~850MPa of tensile strength, elongation percentage A >=16%, The requirement of clod wash d=2a.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (3)

1. 700MPa grades of effective hot rolled strips of truck drive shaft of one kind 3~8mm yield strength, which is characterized in that its chemical component By mass percentage are as follows:
C:0.06~0.08%, Si:0.05~0.15%, Mn:1.50~1.70%, P :≤0.015%, S :≤0.010%, Alt:0.020~0.060%, Nb:0.025~0.035%, Ti:0.070~0.090%, Ca:0.0010~0.0030%, Ce:0.0005~0.0020%, surplus are iron and inevitable impurity.
2. the production method of hot rolled strip described in claim 1 characterized by comprising
Step 1): smelting continuous casting, successively includes: molten iron pretreatment, converter smelting, LF refining, RH application of vacuum and casting machine connect Casting;Wherein, wherein Ce is added in the form of Ce-Fe alloy, is added after RH application of vacuum 8mim by feed bin;
Step 2): continuous casting billet heating, control time inside furnace are 180~240min, and tapping temperature is 1230~1280 DEG C:
Step 3): rolling comprising including roughing and finish rolling;Wherein, 1010~1050 DEG C of the start rolling temperature of the finish rolling, it is described The finishing temperature of finish rolling is 850~880 DEG C;
Step 4): cooling down and batch, and described cooling using section cooling equipment, cooling velocity is 25~35 DEG C/s, coiling temperature It is 600~640 DEG C.
3. production method according to claim 2, which is characterized in that the roughing is thick using 2 machine frame rolling mill of 3+3 mode It rolls, the finish rolling uses 7 rack continuously variable crown milling train finish rolling.
CN201811335980.5A 2018-11-12 2018-11-12 The effective hot rolled strip of one kind 700MPa grades of truck drive shafts of 3 ~ 8mm yield strength and its production method Pending CN109504898A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110484692A (en) * 2019-09-05 2019-11-22 首钢集团有限公司 A method of enhancing wheel steel anti-fatigue performance
CN112410651A (en) * 2020-11-10 2021-02-26 包头钢铁(集团)有限责任公司 Preparation method of 550 MPa-grade excellent-performance steel strip for automobile transmission shaft pipe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103084811A (en) * 2013-01-16 2013-05-08 吉林大学 High strength and light weight vehicle drive shaft assembly manufacturing method
CN107557682A (en) * 2017-08-14 2018-01-09 包头钢铁(集团)有限责任公司 One kind 3 ~ 6mm 540MPa level hot rolling wheel steels and its production method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103084811A (en) * 2013-01-16 2013-05-08 吉林大学 High strength and light weight vehicle drive shaft assembly manufacturing method
CN107557682A (en) * 2017-08-14 2018-01-09 包头钢铁(集团)有限责任公司 One kind 3 ~ 6mm 540MPa level hot rolling wheel steels and its production method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110484692A (en) * 2019-09-05 2019-11-22 首钢集团有限公司 A method of enhancing wheel steel anti-fatigue performance
CN112410651A (en) * 2020-11-10 2021-02-26 包头钢铁(集团)有限责任公司 Preparation method of 550 MPa-grade excellent-performance steel strip for automobile transmission shaft pipe

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Application publication date: 20190322