CN109266966A - One kind is directly cut with Micro Alloying round steel and its production method - Google Patents
One kind is directly cut with Micro Alloying round steel and its production method Download PDFInfo
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- CN109266966A CN109266966A CN201811299666.6A CN201811299666A CN109266966A CN 109266966 A CN109266966 A CN 109266966A CN 201811299666 A CN201811299666 A CN 201811299666A CN 109266966 A CN109266966 A CN 109266966A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The present invention provides one kind and directly cuts with Micro Alloying round steel and its production method.It is of the invention to directly cut with Micro Alloying round steel, it include: C:0.43~0.47%, Si:0.50~0.80%, Mn:1.20~1.50%, P≤0.015%, S≤0.010%, Cr:0.20~0.30%, Ni:0.10~0.25%, Mo:0.03~0.07%, Nb:0.015~0.030%, V:0.08%~0.15%, Ti:0.015~0.025%, Al:0.010~0.025%, Cu≤0.2%, N:140~200ppm, H≤2.0ppm, O≤15ppm by mass percentage；Surplus is Fe and inevitable impurity.The present invention passes through the content of strict control its V and N, it is uniformly distributed and the suitable ferrite and pearlite of ratio so that the bar has, bainite, martensitic structure accounting≤5%, rolling temperature control in the operation of rolling so that non-hardened and tempered steel bar tensile strength >=900MPa, the requirement of the high-tensile of half axle of heavy-duty car bar steel can be expired.
Description
Technical field:
The present invention relates to one kind to directly cut with Micro Alloying round steel and its production method, belongs to technical field of alloy steel.
Background technique:
Current developed non-hardened and tempered steel, tensile strength is generally lower, and current half axle of heavy-duty car is not achieved in tensile strength
High-tensile requirement, thus limit the application in non-bar rings domain of the tune steel in high performance requirements.
Non-hardened and tempered steel only needs controlled rolling (forging) technique and rolls the cooling velocity after (forging) just due to being not required to modifier treatment
Required intensity, toughness and cutting ability can be obtained, therefore is widely used in the auto industry of high speed development, is manufactured with it
The part of the desired strengths and certain cutting ability such as crankshaft, connecting rod, knuckle, front-axle beam on automobile.These parts are gone over
High tempering is handled after quenching using medium carbon steel (carbon steel or steel alloy) is conditioned.Non-hardened and tempered steel and traditional quenched and tempered steel phase
Than due to substantial saved the energy, simplifying manufacturing procedure, reducing investment and extensive by automobile and its parts machining enterprise
Receive, and is developed rapidly.
Suitable element sulphur is typically contained in non-hardened and tempered steel to improve its machinability, while can also be added certain
Microalloy element and nitrogen are to meet its obdurability demand.But due in steel sulphur and nitrogen it is unstable in high-temperature molten steel, in smelting
It refines in production process and is difficult to control.Non-hardened and tempered steel manufacturing enterprise generally uses electric furnace-refinery practice production non-hardened and tempered steel, leads to simultaneously
The rich nitrogen alloy of addition and sulphur-containing alloys (or feeding sulphur line) are crossed to guarantee the nitrogen and sulfur content in steel, recovery rate is low, higher cost
And it is not easy stability contorting, cause rejection rate higher.The tensile strength level of existing non-hardened and tempered steel bar is difficult to reach 900MPa,
It is unable to satisfy requirement of the half axle of heavy-duty car to intensity and impact property.
Summary of the invention:
The purpose of the present invention is provide one kind in view of the above problems to directly cut with Micro Alloying round steel and its production
Method, by the content of strict control its V and N, so that the bar has and is uniformly distributed and the suitable ferrite of ratio and pearl
Body of light, bainite, martensitic structure accounting≤5%, rolling temperature control in the operation of rolling is so that non-hardened and tempered steel bar
Tensile strength >=900MPa can satisfy requirement of the half axle of heavy-duty car to intensity and impact property.
Above-mentioned purpose is achieved through the following technical solutions:
One kind is directly cut with Micro Alloying round steel, by mass percentage include: C:0.43~0.47%, Si:0.50~
0.80%, Mn:1.20~1.50%, P≤0.015%, S≤0.010%, Cr:0.20~0.30%, Ni:0.10~0.25%,
Mo:0.03~0.07%, Nb:0.015~0.030%, V:0.08%~0.15%, Ti:0.015~0.025%, Al:0.010
~0.025%, Cu≤0.2%, N:140~200ppm, H≤2.0ppm, O≤15ppm；Surplus is Fe and inevitable impurity.
The above-mentioned kind of production method directly cut with Micro Alloying round steel, this method comprises the following steps: molten iron → electric furnace refining
Steel → LF refining → VD vacuum processing → molding → hot sending or slow cooling (finishing) → heating → cogging → segmentation → slow cooling → finishing
→ heating → rolling → slow cooling → segmentation → peeling → finishing → sample detection → flaw detection → weighing → mark → storage.
The production method directly cut with Micro Alloying round steel, the electric furnace steel making stage keep C >=0.08%, mesh
Mark 0.10~0.38%；Target P≤0.010%；Target temperature >=1630 DEG C.
The production method directly cut with Micro Alloying round steel, the electric furnace steel making stage tapping auxiliary material requirement: stone
Grey 600kg/ furnace promotees net agent 200kg/ furnace, 1.0~1.2kg/t of aluminium.
The production method directly cut with Micro Alloying round steel, the electric furnace steel making to LF refining phase targets are wanted
It asks: C:0.31~0.41%, Si:0.50~0.65%, Mn:0.94~1.09%, Cr:0.15~0.25%, Ni:0.05~
0.15%；Temperature >=1530 DEG C.
The production method directly cut with Micro Alloying round steel, LF refining demands white slag time >=20 point
Clock, the duration of heat >=40 minute.
The production method directly cut with Micro Alloying round steel, the VD be vacuum-treated demands vacuum degree≤
67pa lower retention time >=12 minute；Soft argon blowing time >=30 minute.
The process conditions of the production method directly cut with Micro Alloying round steel, the molding stage are as follows:
1. 1487 DEG C of liquidus temperature of molding；
2. covering slag is hung by 2.0kg/t using medium high carbon molding slag (small steel ingot is dedicated)；
3. ladle commands seat packet afterwards in place, it is necessary to ensure that ladle is sat just and vertical, otherwise slings after adjustment seat packet again；
4. installing hydraulic cylinder, argon protective device after pouring truck is reached platform, firmly install.；
Operate eye 5. pouring truck is reached above feed trumpet；
It is drained 6. pouring truck is reached at drainage, it is necessary to the mouth of a river can be closed after rectification of getting off, drainage flow is not less than
800kg；
It is poured 7. starting to open eye at pouring truck to feed trumpet with small stream, opens and pour front opening argon gas valve, flow control is 25
~35NL/min；
8. exothermic mixture (FRJ-1) is added by 1.5Kg/t rapidly after casting, carbonization rice husk is added by 1.5Kg/t；
9. hot sending: being demoulded to the draft time, be packed into insulation cover in 45 minutes after steel ingot demoulding；
10. former mould cover is cold: within an hour entering steel ingot band original die button in insulation cover from draft, cover cool time > 120 is small
When or 120 DEG C of ingot mould temperature < whens can pluck cover.
The production method directly cut with Micro Alloying round steel, the operation of rolling is strictly using heating, rolling work
Skill technology, 900 DEG C of preheating section <, 950~1020 DEG C of bringing-up section, 950~1020 DEG C of soaking zone, heating time > 2.5 hours；Eventually
Roll temperature >=830 DEG C.
The utility model has the advantages that
Using method of the invention, the obtained microscopic structure in non-hardened and tempered steel bar is made of ferrite and pearlite.
By controlling the content of V and N in the non-hardened and tempered steel bar, so that the bar has equally distributed ferrite and pearly-lustre
Body, and the ferritic content (vol.%) is 30-40, and surplus is the pearlite.
It grades according to GB/T6394, ferrite grain size >=7.0 grade in the non-hardened and tempered steel bar, also, pearlite
Piece interlamellar spacing is tiny, and crystal grain is tiny, uniform；The mechanical property of steel surface and core is uniform, by the intensity at center to edge, tough
Property fluctuation very little so that it is described to modulation steel bar have preferable combination of strength and toughness.As shown in Figure 1 and Figure 2, described
Non-hardened and tempered steel bar away from outer surface 1/2 microstructure with it is unobvious away from the microstructure at outer surface 1/4
Difference, also illustrate, the bar is evenly distributed with the ferrite and pearly-lustre of proper proportion by center to each position in edge
Body fluctuates very little by the intensity, toughness of core to edge so that the mechanical property of steel surface and core is uniform, so that
The non-hardened and tempered steel bar has preferable combination of strength and toughness.
The non-hardened and tempered steel as made from said components scheme and smelting process meets following performance requirement:
Tensile strength Rm900~1050MPa, Rel >=600MPa, A >=14%, Z >=35%；
Bar bar macrostructure: General Loosen≤2.0 grade, center porosity≤2.0 grade are segregated≤1.0 grades；
The degree of purity of bar: A is thin≤2.0 grades, A it is thick≤1.5 grades, B it is thin≤2.0 grades, B it is thick≤1.5, C it is thin≤1.0 grades, C it is thick
≤ 1.0 grades, D it is thin≤1.0 grades, D it is thick≤1.0 grades, the thick+D of the thick+C of B it is thick≤3.0 grades, the thin+D of the thin+C of B it is thin≤3.0 grades；
The end hardenability of bar: J3=53~59HRC, J9=49~56HRC, J15=43~51HRC；
Bar prior austenite grain size reaches >=7.0 grades；
Microscopic structure is pearlite+ferrite, martensite or bainite accounting≤5%；
Banded structure≤3 grade；
Unilateral total decarburized layer (F+ transition region) is not more than 0.5mm (after peeling)；
Bar flaw detection meets A grades of 4162 standard of GB/T requirements；
Hardness at surface hardness, 1/2 radius: 266~325HB.
Detailed description of the invention:
Fig. 1 is non-hardened and tempered steel finished product bar provided in an embodiment of the present invention away from the metallograph at outer surface 1/2；
Fig. 2 is non-hardened and tempered steel finished product bar provided in an embodiment of the present invention away from the metallograph at outer surface 1/4.
Specific embodiment:
One kind is directly cut with Micro Alloying round steel, by mass percentage include: C:0.43~0.47%, Si:0.50~
0.80%, Mn:1.20~1.50%, P≤0.015%, S≤0.010%, Cr:0.20~0.30%, Ni:0.10~0.25%,
Mo:0.03~0.07%, Nb:0.015~0.030%, V:0.08%~0.15%, Ti:0.015~0.025%, Al:0.010
~0.025%, Cu≤0.2%, N:140~200ppm, H≤2.0ppm, O≤15ppm；Surplus is Fe and inevitable impurity.
The above-mentioned kind of production method directly cut with Micro Alloying round steel, this method comprises the following steps: molten iron → electric furnace refining
Steel → LF refining → VD vacuum processing → molding → hot sending or slow cooling (finishing) → heating → cogging → segmentation → slow cooling → finishing
→ heating → rolling → slow cooling → segmentation → peeling → finishing → sample detection → flaw detection → weighing → mark → storage.
Eaf process:
1. end point requirements: C >=0.08%, target 0.10~0.38%；Target P≤0.010%；Target temperature >=1630
℃。
2. auxiliary material requirement of tapping: lime 600kg/ furnace promotees net agent 200kg/ furnace, 1.0~1.2kg/t of aluminium.
3.EAF is to LF target call.C:0.31~0.41%, Si:0.50~0.65%, Mn:0.94~1.09%, Cr:
0.15~0.25%, Ni:0.05~0.15%；Temperature >=1530 DEG C.
LF technique:
White slag time >=20 minute, the duration of heat >=40 minute.
VD technique:
Retention time >=12 minute condition of high vacuum degree (≤67pa)；Soft argon blowing time >=30 minute.
Die casting process:
1. 1487 DEG C of liquidus temperature.
2. covering slag is hung by 2.0kg/t using medium high carbon molding slag (small steel ingot is dedicated).
3. ladle commands seat packet afterwards in place, it is necessary to ensure that ladle is sat just and vertical, otherwise slings after adjustment seat packet again.
4. installing hydraulic cylinder, argon protective device after pouring truck is reached platform, firmly install.
Operate eye 5. pouring truck is reached above feed trumpet.
It is drained 6. pouring truck is reached at drainage, it is necessary to the mouth of a river can be closed after rectification of getting off, drainage flow is not less than
800kg。
It is poured 7. starting to open eye at pouring truck to feed trumpet with small stream, opens and pour front opening argon gas valve, flow control is 25
~35NL/min.
8. specific casting process parameters are executed by table 1.
Table 1
9. exothermic mixture (FRJ-1) is added by 1.5Kg/t rapidly after casting, carbonization rice husk is added by 1.5Kg/t.
10. hot sending: being demoulded to the draft time, be packed into insulation cover in 45 minutes after steel ingot demoulding；
Former mould cover is cold: within an hour entering steel ingot band original die button in insulation cover from draft, cover cool time > 120 hours
Or cover can be plucked at 120 DEG C of ingot mould temperature <.
Rolling mill practice:
The operation of rolling strictly using heating, Bar Rolling Process, (refers to heating process: preheating section < 900, bringing-up section 950
~1020 DEG C, 950~1020 DEG C of soaking zone, heating time > 2.5 hours；Finishing temperature >=830 DEG C), improve material integrated machine
Tool performance, especially impact flexibility improve steel prior austenite grain size, improve structural homogenity；Surface quality of steel meets thermal pressure
Processing request；
Heating process record is shown in Table 2
Table 2
2. rolling mill practice temperature control record is shown in Table 3
Table 3
3. rolling rear retarded cooling process record is shown in Table 4
Table 4
| Time/point | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Temperature/DEG C | 678 | 647 | 623 | 626 | 619 | 614 | 602 | 580 | 562 | 543 | 524 | 505 |
After the cooling step, by customer requirement sawing and to bar slow cooling processing after, can to obtained bar into
Performing check, finishing, packaging, weighing, storage；Other steps in addition to cooling step can be implemented by using the prior art, and the present invention is real
It applies example and this is not being repeated.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. one kind is directly cut with Micro Alloying round steel, it is characterised in that: by mass percentage include: C:0.43~0.47%,
Si:0.50~0.80%, Mn:1.20~1.50%, P≤0.015%, S≤0.010%, Cr:0.20~0.30%, Ni:0.10
~0.25%, Mo:0.03~0.07%, Nb:0.015~0.030%, V:0.08%~0.15%, Ti:0.015~
0.025%, Al:0.010~0.025%, Cu≤0.2%, N:140~200ppm, H≤2.0ppm, O≤15ppm；Surplus is Fe
And inevitable impurity.
2. a kind of production method directly cut with Micro Alloying round steel, it is characterised in that: this method comprises the following steps: molten iron →
Electric furnace steel making → LF refining → VD vacuum processing → molding → hot sending or slow cooling (finishing) → heating → cogging → segmentation → slow cooling
→ finishing → heating → rolling → slow cooling → segmentation → peeling → finishing → sample detection → flaw detection → weighing → mark → storage.
3. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: the electric furnace refining
The steel stage keeps C >=0.08%, target 0.10~0.38%；Target P≤0.010%；Target temperature >=1630 DEG C.
4. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: the electric furnace refining
Steel stage tapping auxiliary material requirement: lime 600kg/ furnace promotees net agent 200kg/ furnace, 1.0~1.2kg/t of aluminium.
5. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: the electric furnace refining
Steel to LF refining phase targets require: C:0.31~0.41%, Si:0.50~0.65%, Mn:0.94~1.09%, Cr:0.15
~0.25%, Ni:0.05~0.15%；Temperature >=1530 DEG C.
6. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: the LF refining
Demands white slag time >=20 minute, the duration of heat >=40 minute.
7. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: the VD vacuum
Processing stage requires retention time >=12 minute at vacuum degree≤67pa；Soft argon blowing time >=30 minute.
8. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: the molding rank
The process conditions of section are as follows:
1. 1487 DEG C of liquidus temperature of molding；
2. covering slag is hung by 2.0kg/t using medium high carbon molding slag (small steel ingot is dedicated)；
3. ladle commands seat packet afterwards in place, it is necessary to ensure that ladle is sat just and vertical, otherwise slings after adjustment seat packet again；
4. installing hydraulic cylinder, argon protective device after pouring truck is reached platform, firmly install.；
Operate eye 5. pouring truck is reached above feed trumpet；
It is drained 6. pouring truck is reached at drainage, it is necessary to the mouth of a river can be closed after rectification of getting off, drainage flow is not less than
800kg；
Poured 7. starting to open eye at pouring truck to feed trumpet with small stream, open and pour front opening argon gas valve, flow control 25~
35NL/min；
8. exothermic mixture (FRJ-1) is added by 1.5Kg/t rapidly after casting, carbonization rice husk is added by 1.5Kg/t；
9. hot sending: being demoulded to the draft time, be packed into insulation cover in 45 minutes after steel ingot demoulding；
10. former mould cover is cold: steel ingot band original die button is entered in insulation cover within an hour from draft, cover cool time > 120 hours or
Cover can be plucked at 120 DEG C of ingot mould temperature <.
9. the production method according to claim 2 directly cut with Micro Alloying round steel, it is characterised in that: described to roll
Cheng Yange use heating, Bar Rolling Process, 900 DEG C of preheating section <, 950~1020 DEG C of bringing-up section, soaking zone 950~1020
DEG C, heating time > 2.5 hours；Finishing temperature≤900 DEG C.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592476A (en) * | 2019-09-16 | 2019-12-20 | 宝鸡新利达汽车零部件有限公司 | Non-quenched and tempered round steel for direct cutting and method for manufacturing truck pin shaft by using same |
| CN111286670A (en) * | 2020-02-17 | 2020-06-16 | 宝钢特钢韶关有限公司 | Medium-carbon non-quenched and tempered steel and preparation process thereof, and connecting rod and preparation process thereof |
| CN111748751A (en) * | 2019-03-26 | 2020-10-09 | 陕西汽车集团有限责任公司 | Non-quenched and tempered steel, manufacturing method thereof and application of non-quenched and tempered steel |
| CN112301266A (en) * | 2019-07-25 | 2021-02-02 | 广东中坤钒钢科技有限公司 | Non-quenched and tempered round steel for hot forging and production method thereof |
| CN112322984A (en) * | 2020-11-16 | 2021-02-05 | 江苏联峰能源装备有限公司 | Steel for drill rod and preparation method thereof |
| CN113134510A (en) * | 2021-04-27 | 2021-07-20 | 江苏永钢集团有限公司 | Preparation method of large-size non-quenched and tempered steel for direct cutting |
| CN115896629A (en) * | 2022-11-29 | 2023-04-04 | 山东钢铁股份有限公司 | Non-quenched and tempered steel for automobile structural part and rolling method thereof |
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Denomination of invention: A non quenched and tempered round steel for direct cutting and its production method Effective date of registration: 20210616 Granted publication date: 20200925 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: JIANGSU YONGGANG GROUP Co.,Ltd. Registration number: Y2021980004811 |
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