CN104233116B - Manufacture high-strength container tapping screw gren rod and production method thereof - Google Patents
Manufacture high-strength container tapping screw gren rod and production method thereof Download PDFInfo
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- CN104233116B CN104233116B CN201410445785.3A CN201410445785A CN104233116B CN 104233116 B CN104233116 B CN 104233116B CN 201410445785 A CN201410445785 A CN 201410445785A CN 104233116 B CN104233116 B CN 104233116B
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 67
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 238000003801 milling Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 230000001131 transforming Effects 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- 101700012140 TAB1 Proteins 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 210000001519 tissues Anatomy 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims 1
- 230000005712 crystallization Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000000465 moulding Methods 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 2
- 230000000171 quenching Effects 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 210000000282 Nails Anatomy 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- -1 silicon Aluminum Chemical compound 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Abstract
Gren rod is belonged to for manufacturing high-strength container tapping screw gren rod and production method thereof, its chemical analysis (%) by weight is made up of following material: C:0.26～0.30%, Mn:0.80～1.0%, Si≤0.08%, P≤0.025%, S≤0.015%, Cr:0.45～0.65%, and remaining is Fe；The gren rod produced by production method of the present invention, wire rod tensile strength >=590Mpa, elongation percentage >=25%, reduction of area >=50%, 1/3 cold-heading are qualified.Advantage is, process equipment and parameter are arranged rationally, solve long-standing puzzles, significantly improve product quality；Improve wire rod drawing processing, cold heading performance, produce tapping screw, excellent combination property, fully meet the requirement that container maximizes.
Description
Technical field
The invention belongs to gren rod, particularly relate to a kind of for manufacturing high-strength container tapping screw gren rod
And production method.
Background technology
The production of Nowadays, Container shipping tapping screw, generally uses the size hot-rolled wire rod of SWRCH22A, φ 8mm, through pickling,
The working procedure processing such as squama, drawing, cold-heading molding, thread rolling, heat treatment form.SWRCH22A gren rod tensile strength is usually
490～530MPa, along with container production keeps the large-scale development, container tapping screw is proposed raising intensity and wants
Asking, use SWRCH22A gren rod cannot meet requirement at present, urgent need to solve to manufacture high-strength container tapping screw
By the production method of gren rod, produce for manufacturing high-strength container tapping screw gren rod, meet to make
The high intensity tapping screw that van container requires.Disclosed " a kind of control low-carbon cold heading steel yield tensile ratio of China Intellectual Property Office
Hot-rolling method " (application number: 201310059560.X) patent of invention, by the control to SWRCH22A wire rod operation of rolling temperature
System, reduces wire rod yield tensile ratio, is beneficial to wire rod and carries out drawing processing.China Intellectual Property Office is disclosed, and " a kind of low silicon contains aluminum
The production method of steel " (application number: 201210174634.X) patent of invention, it is provided that one avoids SWRCH22A low silicon Aluminum steel
The production method that when steel grade even waters, mouth of a river wadding is dead.Disclosed " a kind of low-carbon cold heading steel gren rod surface of China Intellectual Property Office
The control method of iron scale " (application number: 201210051884.4) patent of invention, it is provided that a kind of reduction low-carbon cold heading steel
The control method of SWRCH22A hot rolling rod bundle surface iron scale thickness.Foregoing invention patent all without reference to or solve manufacture height
The production method of strength set vanning tapping screw gren rod.The present invention is directed to for manufacturing high-strength container tapping screw
With gren rod, a kind of production method for manufacturing high-strength container tapping screw gren rod is proposed.
Summary of the invention
For the defect overcoming prior art to exist, it is an object of the invention to provide a kind of manufacture high-strength container self tapping
Screw gren rod and production method thereof, produce high-strength container tapping screw gren rod, improve gren rod
Combination property, improves wire rod tensile strength, elongation percentage, reduction of area and cold-heading qualification rate, has good poker characteristic simultaneously；Just
In wire rod deep processing, it is possible to meet the requirement making high intensity tapping screw.
For manufacturing high-strength container tapping screw gren rod, its chemical analysis (%) by weight percentage by under
Row material forms: C:0.26～0.30%, Mn:0.80～1.0%, Si≤0.08%, P≤0.025%, S≤0.015%, Cr:
0.45～0.65%, remaining is Fe；The φ 8.0mm gren rod produced by production method of the present invention, wire rod tensile strength >=
590MPa, elongation percentage >=25%, reduction of area >=50%, 1/3 cold-heading are qualified, have good poker characteristic simultaneously, meet high-strength
Degree tapping screw manufactures requirement.
Manufacture the production method of high-strength container tapping screw gren rod, sequentially include the following steps:
1, smelt
Use converter or electric furnace smelting, terminal point control of tapping: [C] 0.06～0.10%, [P]≤0.015%, [S]≤
0.018%.Tapping temperature: 1640～1690 DEG C；Carry out double Slag Retaining Process: before tapping, add floating plug, tap 4/5 time add scum rod
Or slag retaining cone；Alloy, carburant with steel stream add, the alloy joining day: tap 1/3 time be initially added into, tapping 4/5 before add,
2, refine
Using LF refine, LF composition is as follows:
| C% | Si% | Mn% | P% | S% | Cr% | Fe% |
| 0.26～0.30 | ≤0.08 | 0.80～1.0 | ≤0.025 | ≤0.015 | 0.45～0.65 | Surplus |
LF stove out-station temperature: 1550～1610 DEG C；
3, continuous casting
During casting, molten steel in bakie in continuous casting temperature is 1520～1570 DEG C, casting speed control 2.1～2.7m/min, molten steel exist
Electromagnetic agitation in crystallizer, electromagnetic agitation frequency 2.5～3.5Hz, electric current 450～550A；Crystallizer cooling water flow 70～
120m3/h；It is casting continuously to form 140 × 140 (mm) square billet；
4, square billet soaking pit heating
Heating and temperature control, at 1120～1200 DEG C, controls at 65～90 minutes heat time heating time, and furnace pressure control≤
4Pa；
5, roughing
Use six frames short stress tandem mill continuous rolling, for sake of convenience the 1st～6 frame roughing mill number consecutivelies be CF1,
CF2, CF3, CF4, CF5, CF6, rolled piece area decrement 72～88%, rolling technological parameter is as follows:
(1), roughing mills roll diameter of roller (mm)
| CF1 | CF2 | CF3 | CF4 | CF5 | CF6 |
| 490～560 | 490～560 | 490～560 | 420～475 | 420～475 | 420～475 |
(2) roughing rolled piece inlet temperature and outlet temperature (DEG C)
Rolled piece inlet temperature 1000～1100 DEG C, rolled piece outlet temperature 990～1080 DEG C；
(3) roughing rolled piece reduction of area (%) distribution
| CF1 | CF2 | CF3 | CF4 | CF5 | CF6 |
| 19.7～24.0 | 19.0～23.0 | 22.2～27.2 | 21.6～26.4 | 24.0～29.4 | 23.4～26.6 |
(4), roughing mill speed (m/s)
6, roll in
Use four frame intermediate mills to carry out continuous rolling, for sake of convenience the 1st～4 framves roll the numbered ZF1 of roll mill,
ZF2, ZF3, ZF4, rolled piece area decrement is 63～77%, and rolling technological parameter is as follows:
(1), intermediate mill roll diameter of roller (mm)
| ZF1 | ZF2 | ZF3 | ZF4 |
| 420～475 | 370～410 | 370～410 | 370～410 |
(2) rolled piece entrance and outlet temperature (DEG C) in
Rolled piece inlet temperature 960～1050 DEG C, rolled piece outlet temperature 970～1070 DEG C；
(3) rolled piece area decrement (%) distribution in
| ZF1 | ZF2 | ZF3 | ZF4 |
| 24.8～30.3 | 24.0～29.3 | 23.3～28.5 | 22.6～27.6 |
(4) mill speed (m/s) is rolled in
| ZF1 | ZF2 | ZF3 | ZF4 |
| 1.101～1.217 | 1.462～1.616 | 2.032～2.246 | 2.632～2.908 |
7, pre-finish rolling
Use 6 frame pre-finishing mill group continuous rollings, for sake of convenience, the 1st～6 frame pre-finish rolling milling train number consecutively be YF1,
YF2, YF3, YF4, YF5, YF6, rolled piece area decrement 68.0～83.0%, rolling technological parameter is as follows:
1), pre-finishing mill group roll diameter of roller (mm)
| YF1 | YF2 | YF3 | YF4 | YF5 | YF6 |
| 255～285 | 255～285 | 255～285 | 255～285 | 190～208 | 190～208 |
(2) leader bar inlet temperature and outlet temperature (DEG C)
Rolled piece inlet temperature 970～1070 DEG C, rolled piece outlet temperature 960～1020 DEG C；
(3) leader bar reduction of area (%) distribution
(4), pre-finish rolling mill speed (m/s)
8, finish rolling
Use 4 frame mm finishing mill unit continuous rollings, for sake of convenience the 1st～4 frame finishing mill number consecutivelies be JF1, JF2,
JF3, JF4, rolled piece area decrement 53.2～65.0%, rolling technological parameter is as follows: 1), mm finishing mill unit roll diameter of roller (mm)
| JF1 | JF2 | JF3 | JF4 |
| 190～208 | 143～159 | 143～159 | 143～159 |
(2) finish rolling rolled piece inlet temperature and outlet temperature (DEG C)
Rolled piece inlet temperature 980～1020 DEG C, rolled piece outlet temperature 990～1030 DEG C；
(3) finish rolling rolled piece reduction of area (%) distribution
| JF1 | JF2 | JF3 | JF4 |
| 17.4～21.2 | 17.0～20.8 | 21.4～26.2 | 16.1～19.7 |
(4), finish rolling mill speed (m/s)
| JF1 | JF2 | JF3 | JF4 |
| 14.754～16.306 | 18.380～20.314 | 23.770～26.272 | 29.255～32.335 |
9, subtract determine milling train group rolling
Use 4 framves to subtract and determine unit continuous rolling, for sake of convenience the 1st～4 framves subtract determine milling train number consecutively be DF1, DF2,
DF3, DF4, rolled piece area decrement 47.2～57.6%, rolling technological parameter is as follows:
(1), subtract and determine milling train group roll diameter of roller for (mm)
(2) rolled piece entrance and outlet temperature (DEG C) surely are subtracted
Rolled piece inlet temperature 940～1000 DEG C, rolled piece outlet temperature 990～1100 DEG C；
(3) rolled piece area decrement distribution surely is subtracted
| DF1 | DF2 | DF3 | DF4 |
| 14.3～17.5 | 15.1～18.5 | 15.7～19.1 | 15.8～19.4 |
(4) subtract and surely roll mill speed (m/s)
| DF1 | DF2 | DF3 | DF4 |
| 52.213～57.709 | 63.417～70.093 | 76.360～84.398 | 93.005～102.795 |
Laying temperature: 860～920 DEG C
10, cooling is controlled
Use Lcc air-cooled line air-cooled, air-cooled line total length 105m, totally 18 Fans, along rolled piece direction of advance number consecutively be
1,2 ... 18,18 Fans Close Alls during wire rod cooling；The air-cooled line roller-way speed of service 0.18～0.4m/s, thermal insulation cover is common
40, wherein 1#～3# thermal insulation cover is fully open, 4#～29# thermal insulation cover Close All, 30#～40# thermal insulation cover are fully open；Dish
Bar laying temperature 860～920 DEG C, wire rod perlitic transformation process temperature controls at 730～660 DEG C, and fringe time controls 500
～580s, by retarded cooling process, make wire rod tissue coarse grains, to reduce wire rod rolled intensity, to improve plasticity, improve cold-heading
Performance, beneficially user's drawing, cold-heading processing；
11, wire coiling bundling
Collection reel, then bundling, bundling temperature 200 DEG C is entered after wire rod cooling.
12, performance detection
The φ 8.0mm gren rod produced by production method of the present invention, wire rod tensile strength >=590MPa, elongation percentage >=
25%, reduction of area >=50%, 1/3 cold-heading are qualified.
In order to meet for manufacturing high-strength container tapping screw gren rod raising wire rod tensile strength with comprehensive
The requirement of performance.Wire rod chemical composition is adjusted by the present invention, mainly increases C, Mn content, C:0.26～0.30%,
Mn:0.80～1.0%, adds Cr:0.45～0.65%.The increase of C, Mn, Cr content, meets high-strength container self tapping
The performance requirement of screw, but make the intensity increase of rolled wire rod, plasticity, cold heading performance decline, cold-forming property is deteriorated.For solving
The adverse effect that certainly C, Mn, Cr element brings after increasing, needs to redesign cooling controlling and rolling controlling process, and roughing six passage is rolled
System, rolled piece area decrement is 80.8%, in roll 4 passes, rolled piece area decrement is 70.5%, and pre-finish rolling 6 passage is rolled
System, rolled piece area decrement 75.5%, finish rolling 6 passes, rolled piece area decrement 59.1%, subtract and determine machine and roll 4 passages and roll
System, rolled piece area decrement 54.5%, roughing, in roll, pre-finish rolling finish rolling, subtract determine machine rolling employing austenite perfect recrystallization
District's rolling mill practice.The present invention also design specialized cooling controlling and rolling controlling process, finishing temperature control 940～1000 DEG C, laying temperature controls
860～920 DEG C, after weaving silk, rolled piece is cooled to 730～660 DEG C of interval phase transformations with 1 DEG C/s～5 DEG C/s speed, and low in this temperature
Speed slow cooling (0.3～0.5 DEG C/s), after temperature retention time 500～580s, steel naturally cool to room temperature.The gren rod produced, anti-
Tensile strength >=590MPa, elongation percentage >=25%, reduction of area >=50%, 1/3 cold-heading are qualified, have good poker characteristic simultaneously,
Disclosure satisfy that high intensity tapping screw manufactures requirement.Use this φ 8.0mm gren rod, through pickling → phosphatization → be drawn to
φ 7.5mm, cold-heading molding → thread rolling makes tapping screw, then through 860～880 DEG C of quenchings, 230 DEG C of tempering, surface treatment procedures,
The high-strength container tapping screw finished product obtained, properties complies fully with requirement.
Compared with prior art, advantage is, novel, and process equipment configuration is compact, and technological parameter arranges rationally, controls
Convenient, reliable, solve long-standing puzzles, wire rod tensile strength improves, and reaches 590MPa, wire rod reduction of area >=50%,
1/3 cold-heading is qualified, and wire rod poker characteristic is good, and the scattered error of properties is the least, significantly improves product quality；Improve
Wire rod drawing processing, cold heading performance ,-the height that produces through operations such as pickling, squama, drawing, cold-heading molding, thread rolling, heat treatments
Strength set vanning tapping screw, excellent combination property, fully meet the requirement that container maximizes.
Detailed description of the invention
Embodiment 1:
For manufacturing high-strength container tapping screw gren rod, its chemical analysis (%) by weight percentage by under
Row material forms: C:0.28%, Mn:0.86%, Si:0.06%, P:0.02%, S:0.011%, Cr:0.51%, remaining is
Fe, is shown in Table 1；The diameter phi 8.0mm gren rod produced by production method of the present invention, wire rod tensile strength, elongation percentage, face
Shrinkage is shown in Table 2, and 1/3 cold-heading is qualified, has good poker characteristic simultaneously, meet high intensity tapping screw manufacture want
Ask.
1, smelt
Use converter or electric furnace smelting, terminal point control of tapping: [C] 0.06～0.10%, [P]≤0.015%, [S]≤
0.018%.Tapping temperature: 1640～1690 DEG C；Carry out double Slag Retaining Process: before tapping, add floating plug, tap 4/5 time add scum rod
Or slag retaining cone；Alloy, carburant with steel stream add, the alloy joining day: tap 1/3 time be initially added into, tapping 4/5 before add.
2, refine
Using LF refine, LF composition is shown in Table 2, LF stove out-station temperature: 1550～1610 DEG C.
3, continuous casting
During casting, molten steel in bakie in continuous casting temperature is 1520～1570 DEG C, casting speed control 2.1～2.7m/min, molten steel exist
Electromagnetic agitation in crystallizer, electromagnetic agitation frequency 2.5～3.5Hz, electric current 450～550A；Crystallizer cooling water flow 70～
120m3/h；It is casting continuously to form 140 × 140 (mm) square billet.
4, square billet soaking pit heating
Heating and temperature control, at 1120～1200 DEG C, controls at 65～90 minutes heat time heating time, and furnace pressure control≤
4Pa。
5, roughing
Use six frames short stress tandem mill continuous rolling, the 1st～6 frame roughing mill number consecutivelies are CF1, CF2, CF3,
CF4, CF5, CF6, rolled piece area decrement 72～88%, rolling technological parameter is as follows:
(1) roughing mills roll diameter of roller (mm) is shown in Table 3.
(2) roughing rolled piece inlet temperature and outlet temperature (DEG C) are shown in Table 4.
(3) roughing rolled piece reduction of area (%) distribution, is listed in Table 5 below.
(4) roughing mill speed (m/s), is shown in Table 6.
6, roll in
Use four frame intermediate mills to carry out continuous rolling, the 1st～4 framves roll roll mill numbered ZF1, ZF2, ZF3, ZF4,
Rolled piece area decrement is 63～77%, and rolling technological parameter is as follows:
(1) intermediate mill roll is (mm), is listed in Table 7 below.
(2) in, rolled piece entrance and outlet temperature (DEG C), be shown in Table 8.
(3) roll the distribution of middle part area decrement (%), be shown in Table 9.
(4) roll mill speed (m/s) in, be shown in Table 10.
7, pre-finish rolling
Use 6 frame pre-finishing mill group continuous rollings, the 1st～6 frame pre-finish rolling milling train number consecutively is YF1, YF2, YF3,
YF4, YF5, YF6, rolled piece area decrement 68.0～83.0%, rolling technological parameter is as follows:
(1) pre-finishing mill group roll diameter of roller (mm) is listed in Table 11 below.
(2) leader bar inlet temperature and outlet temperature (DEG C), be listed in Table 12 below.
(3) leader bar reduction of area (%) distribution, is shown in Table 13.
(4) pre-finish rolling mill speed (m/s), is listed in the table below in 14.
8, finish rolling
Use 4 frame mm finishing mill unit continuous rollings, for sake of convenience the 1st～4 frame finishing mill number consecutivelies be JF1, JF2,
JF3, JF4, rolled piece area decrement 53.2～65.0%, rolling technological parameter is as follows:
(1) mm finishing mill unit roll diameter of roller (mm), is listed in Table 15 below.
(2) finish rolling rolled piece inlet temperature and outlet temperature (DEG C), be shown in Table 16.
(3) finish rolling rolled piece reduction of area (%) distribution, in row table 17 below.
(4) finish rolling mill speed (m/s), is shown in Table 18.
9, subtract determine milling train group rolling
Using 4 framves to subtract and determine unit continuous rolling, the 1st～4 framves subtract that to determine milling train number consecutively be DF1, DF2, DF3, DF4, roll
Part area decrement 47.2～57.6%, rolling technological parameter is as follows:
(1) subtract and determine milling train group roll diameter of roller (mm), be shown in Table 19.
(2) subtract rolled piece entrance and outlet temperature (DEG C) surely, be shown in Table 20.
(3) subtract rolled piece reduction of area (%) distribution surely, be listed in table 21.
(4) subtract and surely roll mill speed (m/s), be listed in table 22.
Laying temperature: 860～920 DEG C
10, cooling is controlled
Use Lcc air-cooled line air-cooled, air-cooled line total length 105m, totally 18 Fans, along rolled piece direction of advance number consecutively be
1,2 ... 18,18 Fans Close Alls during wire rod cooling；The air-cooled line roller-way speed of service 0.18～0.4m/s, thermal insulation cover is common
40, wherein 1#～3# thermal insulation cover is fully open, 4#～29# thermal insulation cover Close All, 30#～40# thermal insulation cover are fully open；Dish
Bar laying temperature 860～920 DEG C, wire rod perlitic transformation process temperature controls at 730～660 DEG C, and fringe time controls 500
～580s, by slow cooling, make wire rod tissue coarse grains, to reduce wire rod rolled intensity, to improve plasticity, improve cold-heading
Can, beneficially user's drawing, cold-heading processing；
11, wire coiling bundling
Collection reel, then bundling, bundling temperature 200 DEG C is entered after wire rod cooling.
12, the φ 8.0mm gren rod produced by production method of the present invention, wire rod tensile strength >=590MPa, elongation percentage
>=25%, reduction of area >=50%, 1/3 cold-heading are qualified,
φ 8.0mm gren rod, through pickling → phosphatization → be drawn to φ 7.5mm, self tapping spiral shell is made in cold-heading molding → thread rolling
Nail, then through 860～880 DEG C of quenchings, 230 DEG C of tempering, surface treatment procedures, the high-strength container tapping screw obtained becomes
Product, properties complies fully with requirement.
Embodiment 2
With embodiment 1 method, chemical composition is listed in table 1, and performance is listed in table 2, and rolling technological parameter lists table 3 respectively in
～in 22.
Embodiment 3
With embodiment 1 method, chemical composition is listed in table 1, and performance is listed in table 2, and rolling technological parameter lists table 3 respectively in
～in 22.
Subordinate list:
Table 1 embodiment of the present invention chemical composition (%) table
| Embodiment | C | Si | Mn | P | S | Cr | Fe |
| 1 | 0.28 | 0.06 | 0.86 | 0.020 | 0.011 | 0.51 | Surplus |
| 2 | 0.29 | 0.06 | 0.88 | 0.017 | 0.010 | 0.54 | Surplus |
| 3 | 0.27 | 0.07 | 0.90 | 0.019 | 0.010 | 0.57 | Surplus |
Table 2 embodiment of the present invention performance table
Table 3 roughing mills roll diameter of roller (mm) table
| Embodiment | CF1 | CF2 | CF3 | CF4 | CF5 | CF6 |
| 1 | 548 | 548 | 548 | 467 | 467 | 467 |
| 2 | 548 | 548 | 548 | 467 | 467 | 467 |
| 3 | 536 | 536 | 536 | 459 | 459 | 459 |
Table 4 rolled piece inlet temperature and outlet temperature (DEG C) table
| Sequence number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Entrance | 1050 | 1055 | 1053 |
| Outlet | 1040 | 1045 | 1043 |
Table 5 roughing rolled piece reduction of area (%) allocation table
| Sequence number | CF1 | CF2 | CF3 | CF4 | CF5 | CF6 |
| Embodiment 1 | 21.9 | 21.0 | 24.7 | 24.0 | 26.7 | 26.0 |
| Embodiment 2 | 21.6 | 20.8 | 24.8 | 23.9 | 26.8 | 26.1 |
| Embodiment 3 | 21.8 | 21.1 | 24.6 | 24.1 | 26.5 | 25.9 |
Table 6 roughing mill speed (m/s) table
| Sequence number | CF1 | CF2 | CF3 | CF4 | CF5 | CF6 |
| Embodiment 1 | 0.180 | 0.253 | 0.332 | 0.446 | 0.612 | 0.832 |
| Embodiment 2 | 0.179 | 0.252 | 0.330 | 0.445 | 0.610 | 0.830 |
| Embodiment 3 | 0.179 | 0.252 | 0.330 | 0.445 | 0.610 | 0.830 |
Table 7 intermediate mill roll is (mm) table
| Sequence number | ZF1 | ZF2 | ZF3 | ZF4 |
| Embodiment 1 | 467 | 404 | 404 | 404 |
| Embodiment 2 | 467 | 404 | 404 | 404 |
| Embodiment 3 | 459 | 398 | 398 | 398 |
Rolled piece entrance and outlet temperature (DEG C) table in table 8
Table 9 rolls middle part area decrement (%) allocation table
| Sequence number | ZF1 | ZF2 | ZF3 | ZF4 |
| Embodiment 1 | 27.6 | 26.7 | 25.9 | 25.1 |
| Embodiment 2 | 27.5 | 26.8 | 26.0 | 25.0 |
| Embodiment 3 | 27.6 | 26.7 | 25.9 | 25.1 |
Table 10 rolls mill speed (m/s) table
| Sequence number | ZF1 | ZF2 | ZF3 | ZF4 |
| Embodiment 1 | 1.159 | 1.539 | 2.139 | 2.770 |
| Embodiment 2 | 1.159 | 1.539 | 2.139 | 2.770 |
| Embodiment 3 | 1.158 | 1.538 | 2.138 | 2.769 |
Table 11 pre-finishing mill group roll diameter of roller (mm) table
| Sequence number | YF1 | YF2 | YF3 | YF4 | YF5 | YF6 |
| Embodiment 1 | 282 | 282 | 282 | 282 | 206 | 206 |
| Embodiment 2 | 282 | 282 | 282 | 282 | 206 | 206 |
| Embodiment 3 | 282 | 282 | 282 | 282 | 206 | 206 |
Table 12 leader bar inlet temperature and outlet temperature (DEG C) table
Table 13 leader bar reduction of area (%) allocation table
| Sequence number | YF1 | YF2 | YF3 | YF4 | YF5 | YF6 |
| Embodiment 1 | 25.9 | 21.4 | 23.5 | 14.2 | 22.7 | 17.2 |
| Embodiment 2 | 25.9 | 21.4 | 23.5 | 14.2 | 22.7 | 17.2 |
| Embodiment 3 | 25.8 | 21.5 | 23.6 | 14.1 | 22.6 | 17.3 |
Table 14 pre-finish rolling mill speed (m/s) table
| Sequence number | YF1 | YF2 | YF3 | YF4 | YF5 | YF6 |
| Embodiment 1 | 3.722 | 4.760 | 6.247 | 7.504 | 9.502 | 11.677 |
| Embodiment 2 | 3.722 | 4.760 | 6.247 | 7.504 | 9.502 | 11.677 |
| Embodiment 3 | 3.722 | 4.760 | 6.247 | 7.504 | 9.502 | 11.677 |
Table 15 mm finishing mill unit roll diameter of roller (mm) table
| JF1 | JF2 | JF3 | JF4 | |
| Embodiment 1 | 206 | 157.6 | 157.6 | 157.6 |
| Embodiment 2 | 206 | 157.6 | 157.6 | 157.6 |
| Embodiment 3 | 206 | 157.6 | 157.6 | 157.6 |
Table 16 finish rolling rolled piece inlet temperature and outlet temperature (DEG C) table
| Sequence number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Entrance | 1000 | 995 | 1010 |
| Outlet | 1005 | 1000 | 1020 |
Table 17 finish rolling rolled piece reduction of area (%) allocation table
| Sequence number | JF1 | JF2 | JF3 | JF4 |
| Embodiment 1 | 19.3 | 18.9 | 23.8 | 17.9 |
| Embodiment 2 | 19.4 | 19.0 | 23.6 | 17.8 |
| Embodiment 3 | 19.4 | 19.0 | 23.6 | 17.8 |
Table 18 finish rolling mill speed (m/s) table
| Sequence number | JF1 | JF2 | JF3 | JF4 |
| Embodiment 1 | 15.510 | 19.450 | 25.001 | 30.775 |
| Embodiment 2 | 15.510 | 19.450 | 25.001 | 30.775 |
| Embodiment 3 | 15.530 | 19.347 | 25.021 | 30.795 |
Table 19 subtracts determines milling train group roll diameter of roller (mm) table
| Sequence number | DF1 | DF2 | DF3 | DF4 |
| Embodiment 1 | 206 | 157.6 | 157.6 | 157.6 |
| Embodiment 2 | 206 | 157.6 | 157.6 | 157.6 |
| Embodiment 3 | 206 | 157.6 | 157.6 | 157.6 |
Table 20 subtracts rolled piece entrance and outlet temperature (DEG C) table surely
| Sequence number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Entrance | 980 | 990 | 985 |
| Outlet | 990 | 1010 | 1000 |
Table 21 subtracts rolled piece reduction of area (%) allocation table surely
| Sequence number | DF1 | DF2 | DF3 | DF4 |
| Embodiment 1 | 15.9 | 16.8 | 17.4 | 17.6 |
| Embodiment 2 | 16.0 | 16.7 | 17.3 | 17.7 |
| Embodiment 3 | 15.9 | 16.8 | 17.4 | 17.6 |
Table 22 subtracts and surely rolls mill speed (m/s) table
| Sequence number | DF1 | DF2 | DF3 | DF4 |
| Embodiment 1 | 54.963 | 66.757 | 80.381 | 97.902 |
| Embodiment 2 | 54.961 | 66.755 | 80.379 | 97.900 |
| Embodiment 3 | 54.963 | 66.757 | 80.381 | 97.902 |
Claims (1)
1. manufacture a production method for high-strength container tapping screw gren rod, sequentially include the following steps:
1), smelt
Use converter or electric furnace smelting, terminal point control of tapping: [C] 0.06～0.10%, [P]≤0.015%, [S]≤
0.018%, tapping temperature: 1640～1690 DEG C；Carry out double Slag Retaining Process: before tapping, add floating plug, tap 4/5 time add scum rod
Or slag retaining cone；Alloy, carburant with steel stream add, the alloy joining day: tap 1/3 time be initially added into, tapping 4/5 before add,
2), refine
Using LF refine, LF composition is as follows: C:0.26～0.30%, Si≤0.08%, Mn:0.80～1.0%, P≤
0.025%, S≤0.015%, Cr:0.45～0.65%, Fe surplus；
LF stove out-station temperature: 1550～1610 DEG C；
3), continuous casting
During casting, molten steel in bakie in continuous casting temperature is 1520～1570 DEG C, casting speed control 2.1～2.7m/min, molten steel be in crystallization
Electromagnetic agitation in device, electromagnetic agitation frequency 2.5～3.5Hz, electric current 450～550A；Crystallizer cooling water flow 70～120m3/
h；It is casting continuously to form 140 × 140mm square billet；
4), square billet soaking pit heating
Heating and temperature control, at 1120～1200 DEG C, controls at 65～90 minutes, furnace pressure control≤4Pa heat time heating time；
5), roughing
Use six frames short stress tandem mill continuous rolling, the 1st～6 frame roughing mill number consecutivelies are CF1, CF2, CF3, CF4,
CF5, CF6, rolled piece area decrement 72～88%, rolling technological parameter is as follows:
(1), roughing mills roll diameter of roller: CF1:490～560mm, CF2:490～560mm, CF3:490～560mm, CF4:420
～475mm, CF5:420～475mm, CF6:420～475mm；
(2), roughing rolled piece inlet temperature and outlet temperature
Rolled piece inlet temperature 1000～1100 DEG C, rolled piece outlet temperature 990～1080 DEG C；
(3), roughing rolled piece reduction of area distribution: CF1:19.7～24.0%, CF2:19.0～23.0%, CF3:22.2～
27.2%, CF4:21.6～26.4%, CF5:24.0～29.4%, CF6:23.4～26.6%；
(4), roughing mill speed: CF1:0.171～0.189m/s, CF2:0.240～0.266m/s, CF3:0.315～
0.349m/s, CF4:0.424～0.468m/s, CF5:0.581～0.643m/s, CF6:0.790～0.874m/s；
6) roll in,
Use four frame intermediate mills to carry out continuous rolling, the 1st～4 framves roll roll mill numbered ZF1, ZF2, ZF3, ZF4, rolled piece
Area decrement is 63～77%, and rolling technological parameter is as follows:
(1), intermediate mill roll diameter of roller: ZF1:420～475mm, ZF2:370～410mm, ZF3:370～410mm, ZF4:370
～410mm；
(2) rolled piece entrance and outlet temperature in
Rolled piece inlet temperature 960～1050 DEG C, rolled piece outlet temperature 970～1070 DEG C；
(3) in rolled piece area decrement distribution: ZF1:24.8～30.3%, ZF2:24.0～29.3%, ZF3:23.3～
28.5%, ZF4:22.6～27.6%；
(4) roll in mill speed: ZF1:1.101～1.217m/s, ZF2:1.462～1.616m/s, ZF3:2.032～
2.246m/s, ZF4:2.632～2.908m/s；
7), pre-finish rolling
Use 6 frame pre-finishing mill group continuous rollings, the 1st～6 frame pre-finish rolling milling train number consecutively is YF1, YF2, YF3, YF4,
YF5, YF6, rolled piece area decrement 68.0～83.0%, rolling technological parameter is as follows:
(1), pre-finishing mill group roll diameter of roller: YF1:255～285mm, YF2:255～285mm, YF3:255～285mm, YF4:
255～285mm, YF5:190～208mm, YF6:190～208mm；
(2) leader bar inlet temperature and outlet temperature DEG C
Rolled piece inlet temperature 970～1070 DEG C, rolled piece outlet temperature 960～1020 DEG C；
(3) leader bar reduction of area distribution: YF1:23.3～28.5%, YF2:19.3～23.5%, YF3:21.1～
25.8%, YF4:12.8～15.6%, YF5:20.4～25.0%, YF6:15.5～18.9%,
(4), pre-finish rolling mill speed: YF1:3.536～3.908m/s, YF2:4.522～4.998m/s, YF3:5.935～
6.559m/s, YF4:7.129～7.879m/s, YF5:9.027～9.977m/s, YF6:11.093～12.261m/s；
8), finish rolling
Using 4 frame mm finishing mill unit continuous rollings, the 1st～4 frame finishing mill number consecutivelies are JF1, JF2, JF3, JF4, rolled piece area
Decrement 53.2～65.0%, rolling technological parameter is as follows:
(1), mm finishing mill unit roll diameter of roller: JF1:190～208mm, JF2:143～159mm, JF3:143～159mm, JF4:143
～159mm；
(2) finish rolling rolled piece inlet temperature and outlet temperature DEG C
Rolled piece inlet temperature 980～1020 DEG C, rolled piece outlet temperature 990～1030 DEG C；
(3) finish rolling rolled piece reduction of area distribution: JF1:17.4～21.2%, JF2:17.0～20.8%, JF3:21.4～26.2%,
JF4:16.1～19.7%；
(4), finish rolling mill speed: JF1:14.754～16.306m/s, JF2:18.380～20.314m/s, JF3:23.770～
26.272m/s, JF4:29.255～32.335m/s；
9), subtract determine milling train group rolling
Using 4 framves to subtract and determine unit continuous rolling, the 1st～4 framves subtract that to determine milling train number consecutively be DF1, DF2, DF3, DF4, rolled piece face
Long-pending decrement 47.2～57.6%, rolling technological parameter is as follows:
(1), subtract and determine milling train group roll diameter of roller: DF1:190～208mm, DF2:143～159mm, DF3:143～159mm, DF4:
143～159mm；
(2) rolled piece entrance and outlet temperature surely are subtracted
Rolled piece inlet temperature 940～1000 DEG C, rolled piece outlet temperature 990～1100 DEG C；
(3) subtract surely rolled piece area decrement distribution: DF1:14.3～17.5%, DF2:15.1～18.5%, DF3:15.7～
19.1%, DF4:15.8～19.4%；
(4) subtract and surely roll mill speed: DF1:52.213～57.709m/s, DF2:63.417～70.093m/s, DF3:76.360
～84.398m/s, DF4:93.005～102.795m/s；
Laying temperature: 860～920 DEG C
10), cooling is controlled
Use Lcc air-cooled line air-cooled, air-cooled line total length 105m, totally 18 Fans, along rolled piece direction of advance number consecutively be 1,
2 ... 18,18 Fans Close Alls during wire rod cooling；The air-cooled line roller-way speed of service 0.18～0.4m/s, thermal insulation cover totally 40
Individual, wherein 1#～3# thermal insulation cover is fully open, 4#～29# thermal insulation cover Close All, 30#～40# thermal insulation cover are fully open；Wire rod
Laying temperature 860～920 DEG C, wire rod perlitic transformation process temperature controls at 730～660 DEG C, fringe time control 500～
580s, by retarded cooling process, makes wire rod tissue coarse grains, to reduce wire rod rolled intensity, to improve plasticity, improve cold-heading
Can, beneficially user's drawing, cold-heading processing；
11), wire coiling bundling
Collection reel, then bundling, bundling temperature 200 DEG C is entered after wire rod cooling；
12), performance detection
The φ 8.0mm gren rod produced, wire rod tensile strength >=590MPa, elongation percentage >=25%, reduction of area >=50%, 1/
3 cold-headings are qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410445785.3A CN104233116B (en) | 2014-09-03 | Manufacture high-strength container tapping screw gren rod and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410445785.3A CN104233116B (en) | 2014-09-03 | Manufacture high-strength container tapping screw gren rod and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104233116A CN104233116A (en) | 2014-12-24 |
| CN104233116B true CN104233116B (en) | 2017-01-04 |
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