CN103551404B - A kind of production method of stainless screw-thread steel - Google Patents
A kind of production method of stainless screw-thread steel Download PDFInfo
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- CN103551404B CN103551404B CN201310545482.4A CN201310545482A CN103551404B CN 103551404 B CN103551404 B CN 103551404B CN 201310545482 A CN201310545482 A CN 201310545482A CN 103551404 B CN103551404 B CN 103551404B
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Abstract
The present invention relates to a kind of production method of stainless screw-thread steel, technological process comprises: cogging, roughing, in roll, finish rolling, it is characterized in that: finished product through in roll after, arrange Water cooling device, after cooling, enter finishing mill again, concrete steps are: before finished product rolling, increase Water cooling device, realize controlled cooling model before two-phase screw-thread steel finished product, cooling water flow is 35-45m3/ hour, and pressure is 0.4-0.6MPa, and cool time is 1-2 second.The method simple process, cooling before tandem rolling, the finished product that can effectively prevent roller repairing from bringing directly spends inadequate problem; The dimensional accuracy of product, surface quality, mechanical property all significantly improve, and production efficiency increases substantially; And the two phase stainless steel spiral prepared has many-sided advantages such as corrosion-resistant, cost is low, the life-span is long, is widely used in bridge construction etc., wide market, for enterprise creates considerable benefit.
Description
Technical field
The present invention relates to a kind of cooling means of stainless screw-thread steel.
Background technology
The technological process that production line of bar produces screw-thread steel is: heating, and------lowering the temperature to be rolled,---4 frame 480 2 roller horizontal mills---S4 crop end is cut, and---------------------------put in storage shear gauge hot-metal sawing machine cold bed multi-length shear pinch roll inclined guide groove 2 frame 360 2 roller horizontal mills to collect bundling by pickling---packing of weighing---in 650 3 roller coggings; When production 32,28 two-phase stainless screw-thread steel, 360 2 roller horizontal mill the 4th framves are as finished product rolling mill, and the spring of this type rolling mill is large, roll axial float is comparatively large, and screw-thread steel size is difficult to ensure, frequent wrong roller, produce a large amount of waste product, handling failure of need frequently stopping, production efficiency is low, and screw-thread steel product mechanical property is in English mark standard rolls off the production line edge, if finished product goes out Water cooling after pass, screw-thread steel can be caused directly to spend not up to standard, increase straightener, need equipment be increased, increase production cost.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention aims to provide a kind of cooling means of stainless screw-thread steel, and screw-thread steel finished product sortie is moved to pre-finish rolling, the relative two roller horizontal mills of this type rolling mill, and bounce little, precision is high, is easy to adjustment and controls.Milling train in 2 vacant framves is set up 2 and wears water-cooling apparatus, realize Water cooling controlled rolling before finished product, after cooling, carry out finish rolling, not only make two-phase stainless screw-thread steel mechanical performance index improve 12%, and do not affect the straight degree of two-phase stainless screw-thread steel.
The cooling means of stainless screw-thread steel provided by the invention, realizes by the following technical solutions:
A kind of production method of stainless screw-thread steel, technological process comprises: cogging, roughing, in roll, finish rolling, it is characterized in that: finished product through in roll after, arrange Water cooling device, after cooling, enter finishing mill again, concrete steps are: before finished product rolling, increase Water cooling device, realize controlled cooling model before two-phase screw-thread steel finished product, cooling water flow is 35-45m3/ hour, and pressure is 0.4-0.6MPa, 1-2 second cool time.
The production method of described stainless screw-thread steel, comprises the following steps:
(1) heat
Blank enters pusher-type furnace, and tapping temperature is 1100 DEG C-1200 DEG C, the size 220mmx220mmx3500mm of blank;
(2) cogging
Adopt 650 three-high bloomers, blank, through 650 mill milling 13 passages, rolls into 85mm round steel by 220mm × 220mm, and after cogging, temperature is 950 DEG C-1050 DEG C, and cooling is waited for;
(3) roughing
Roughing technique comprises 4 frame 480 2 roller horizontal mills, and enter roughing mill when blank temperature drops to below 870 DEG C, through four tandem rollings, last roughing mill rolls into 48mm round steel;
(4) shear
Through S4 cutting head and back-end crop, head and afterbody defect are cut only, crop length 300mm-350mm, back-end crop length 350mm-500mm;
(5) roll in
Middle roll process comprises 2 frame 360 2 roller horizontal mills, enters middle milling train twice tandem rolling and rolls into 36mm round steel; Rolled piece goes out temperature≤860 DEG C after milling train;
(6) Water cooling
Arrange two and wear water-cooling apparatus, round steel head enters water cooling plant, and when head leaves water cooling plant moment, water cooling plant magnetic valve starts, water cooling plant water flowing cooling rolled piece, and two groups of water cooling plants can lower the temperature 60 DEG C ~ 80 DEG C;
Workpiece front end leaves water-spraying control rolled piece after water cooling plant, and it is that water cooling plant makes rolled piece temperature reduce in order to prevent workpiece front end temperature drop from causing more greatly next sortie load to increase that head does not cool;
(7) pre-finish rolling
Adopt 275 cantilevered pre-finishing mills, pre-finishing mill is nipped after rolled piece, and Horizontal loose sleeve loop-rising roll level shifts out and makes rolled piece form semicircular arc, realizes tension free rolling;
(8) secondary finish rolling
Adopt 275 cantilevered pre-finishing mills, pre-finishing mill second rolling mill is nipped after rolled piece, vertical kink loop-rising roll moves and makes rolled piece form semicircular arc, realize tension free rolling;
Rolled piece goes out through cross roll road pinch roll after milling train, and pinch roll speed faster than rolling mill speed 8%, forms certain tension force between pinch roll and milling train, rolled piece is stretching, meanwhile, when rolled piece leaves milling train, ensures that rolled piece travels at the uniform speed;
(9) secondary shearing
Adopt multi-length shear, size sets rational multiple lengths as requested, by multi-length shear, rolled piece is cut into several cut lengths;
Multiple lengths can not exceed cold bed length, but can not be too short, prevents multiple length from knocking into the back, causes the accident;
(10) cool, pack
Rolled piece through cold bed cooling, is collected together again, the size required for becoming through hot-metal sawing machine sawing, inspection, bundling, and pickling, washes away the stainless screw-thread steel oxide on surface of dual phase steel, packaging of weighing warehouse-in.
Described Water cooling device, comprise inlet tube, entrance bearing, entrance base, connecting duct, outlet bearing, outlet, outlet base, total length 1.7m, cooling water nozzle is established in entrance bearing, nozzle inside diameter 10mm, angle with workpiece to be cooled is 11 ° ~ 15 °, is fixed on memorial archway crossbeam by entrance base; Outlet bearing is connected with entrance bearing by connecting duct, outlet bearing is provided with the osculum of two caliber 40mm, be fixed on memorial archway crossbeam by outlet base, outlet bearing rear portion outlet, inner installation contrainjector, nozzle inside diameter 8mm, is stoped cooling water to flow out from water cooling plant, is discharged by osculum.
The present invention is in two framves after milling train, and design Water cooling device, realize controlled cooling model before the stainless screw-thread steel finished product of dual phase steel, this cooling device, ensures that cooling water fully contacts with cooling piece, reduction rolled piece temperature.Rear two framves in milling train in original four framves are moved to pre-finish-rolling process, pre-finishing mill supplied materials cross section diameter increases 6mm than original supplied materials cross section diameter, the former design diapsid of pre-smart machine first roll collar of rolling mill, widen due to pass and change single-orifice type into, the outer labyrinth ring of milling train changes thin 6mm, second rolling mill is constant, according to the corresponding guide and guard of Groove Design.
Of the present invention
beneficial effect:
After this milling method is implemented, the dimensional accuracy of two-phase stainless screw-thread steel, surface quality, mechanical property all significantly improve, and production efficiency increases substantially.Solving two-phase stainless screw-thread steel is not changing on the basis of main equipment, once lumber-preserving, and the two phase stainless steel spiral prepared has many-sided advantages such as corrosion-resistant, cost is low, the life-span is long, is widely used in bridge construction etc., wide market, for enterprise creates considerable benefit.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following examples.
Embodiment 1: the production method of stainless screw-thread steel
(1) heat
Blank enters pusher-type furnace, and tapping temperature is 1100 DEG C-1120 DEG C; The size 220mmx220mmx3500mm of blank
(2) cogging
Adopt 650 three-high bloomers, blank, through 650 mill milling 13 passages, rolls into 85mm round steel by 220mm × 220mm, and after cogging, temperature is 950 DEG C-1050 DEG C, and cooling is waited for;
(3) roughing
Roughing technique comprises 4 frame 480 2 roller horizontal mills, blank temperature drops to≤870 DEG C time enter roughing mill, through four tandem rollings, last roughing mill rolls into 48mm round steel;
(4) shear
Through S4 cutting head and back-end crop, head and afterbody defect are cut only;
(5) roll in
Middle roll process comprises 2 frame 360 2 roller horizontal mills, enters middle milling train twice tandem rolling and rolls into 36mm round steel; After rolled piece goes out milling train, temperature is≤860 DEG C
(6) Water cooling
Arrange two and wear water-cooling apparatus, round steel head enters water cooling plant, and when head leaves water cooling plant moment, water cooling plant magnetic valve starts, water cooling plant water flowing cooling rolled piece, and two groups of water cooling plants make rolled piece lower the temperature 60 DEG C-100 DEG C;
Workpiece front end leaves water-spraying control rolled piece after water cooling plant, and it is that water cooling plant makes rolled piece temperature reduce in order to prevent workpiece front end temperature drop from causing more greatly next sortie load to increase that head does not cool;
(7) pre-finish rolling
Adopt 275 cantilevered finishing mills, pre-finishing mill is nipped after rolled piece, and Horizontal loose sleeve loop-rising roll level shifts out and makes rolled piece form semicircular arc, realizes tension free rolling;
(8) secondary finish rolling
Adopt 275 cantilevered finishing mills, pre-finishing mill second rolling mill is nipped after rolled piece, vertical kink loop-rising roll moves and makes rolled piece form semicircular arc, realize tension free rolling;
Rolled piece goes out through cross roll road pinch roll after milling train, and pinch roll speed faster than rolling mill speed 8%, forms certain tension force between pinch roll and milling train, rolled piece is stretching, meanwhile, when rolled piece leaves milling train, ensures that rolled piece travels at the uniform speed;
(9) secondary shearing
Adopt multi-length shear, set rational multiple lengths as requested: 28m, by multi-length shear, rolled piece is cut into cut lengths: 7m;
Multiple lengths can not exceed cold bed length, but can not be too short, prevents multiple length from knocking into the back, causes the accident;
(10) cool, pack
Rolled piece through cold bed cooling, is collected together again, the size required for becoming through hot-metal sawing machine sawing, inspection, bundling, and pickling, washes away the stainless screw-thread steel oxide on surface of dual phase steel, packaging of weighing warehouse-in.
Produce Φ 32 specification stainless steel spiral, when middle milling train is as finisher, reinforcing bar basic circle diagonal difference 0.5-1mm, rolled piece rough surface, after adopting the method for the present embodiment, reinforcing bar basic circle diagonal difference 0-0.3mm, surface roughness has had raising.
No gentle rolling before cold rolling process put into use a water-cooled, Φ32 specification stainless steel rebar yield strength 510MPa, gentle rolling before cold rolling process put into use a water-cooled, Φ32 specification stainless steel rebar yield strength of 560MPa.
Embodiment 2: the production method of stainless screw-thread steel
The processing step of the present embodiment is with embodiment 1, and finished product frame moves on to 275 cantilevered finishing mills, and single groove amount of rolling brings up to 400 tons by original 200 tons, rolled piece Water cooling before finished product.
When adopting existing technique, after Φ 32 specification stainless steel spiral rolls rear finished product, the straight degree of cooling reaches below 4mm/m; Adopt the inventive method, the straight degree≤3mm/m of cooling before Φ 32 specification stainless steel spiral finished product; The straight degree of the present embodiment gained finished product is 2.5mm/m.
Claims (2)
1. a production method for two-phase stainless screw-thread steel, technological process comprises: cogging, roughing, in roll, finish rolling, rolled piece through in roll after, Water cooling device is set, through cooling after enter finishing mill again, it is characterized in that: comprise the following steps:
(1) heat
Blank enters pusher-type furnace, and tapping temperature is 1100 DEG C-1200 DEG C, and billet size is 220mmx220mmx3500mm;
(2) cogging
Adopt 650 three-high bloomers, blank, through 650 three-high bloomer rolling 13 passages, rolls into 85mm rolled piece by 220mm × 220mm, and after cogging, temperature is 950 DEG C-1050 DEG C, and cooling is waited for;
(3) roughing
Roughing technique comprises 4 frame 480 2 roller horizontal mills, and enter 480 2 roller horizontal mills when blank temperature drops to below 870 DEG C, through four tandem rollings, last roughing mill rolls into 48mm rolled piece;
(4) shear
Through S4 cutting head and back-end crop, head and afterbody defect are cut only, crop length 300mm-350mm, back-end crop length 350mm-500mm;
(5) roll in
Middle roll process comprises two frame 360 2 roller horizontal mills, enters middle milling train two frame 360 2 roller horizontal mill and rolls into 36mm rolled piece; Rolled piece goes out temperature≤860 DEG C after 360 2 roller horizontal mills;
(6) Water cooling
Arrange two and wear water-cooling apparatus, workpiece front end enters Water cooling device, and when head leaves Water cooling device moment, Water cooling device magnetic valve starts, Water cooling device water flowing cooling rolled piece, and two groups of Water cooling devices can lower the temperature 60 DEG C ~ 80 DEG C; Cooling water flow is 35-45m3/ hour, and pressure is 0.4-0.6MPa, and cool time is 1-2 second;
(7) pre-finish rolling
Adopt 275 cantilevered finishing mills, finishing mill is nipped after rolled piece, and Horizontal loose sleeve loop-rising roll level shifts out and makes rolled piece form semicircular arc, realizes tension free rolling;
(8) secondary finish rolling
Adopt 275 cantilevered finishing mills, finishing mill second rolling mill is nipped after rolled piece, vertical kink loop-rising roll moves and makes rolled piece form semicircular arc, realize tension free rolling;
Rolled piece goes out through cross roll road pinch roll after milling train, and pinch roll speed faster than rolling mill speed 8%, forms certain tension force between pinch roll and milling train, rolled piece is stretching, meanwhile, when rolled piece leaves milling train, ensures that rolled piece travels at the uniform speed;
(9) secondary shearing
Adopt multi-length shear, size sets rational multiple lengths as requested, by multi-length shear, rolled piece is cut into several cut lengths;
(10) cool, pack
Rolled piece through cold bed cooling, is collected together again, the size required for becoming through hot-metal sawing machine sawing, inspection, bundling, and pickling, washes away two-phase stainless screw-thread steel oxide on surface, packaging of weighing warehouse-in.
2. the production method of two-phase stainless screw-thread steel according to claim 1, it is characterized in that: described Water cooling device, comprise inlet tube, entrance bearing, entrance base, connecting duct, outlet bearing, outlet, outlet base, total length 1.7m, cooling water nozzle is established in entrance bearing, cooling water nozzle internal diameter 10mm, is the angle of 11 ° ~ 15 ° with rolled piece to be cooled, is fixed on memorial archway crossbeam by entrance base; Outlet bearing is connected with entrance bearing by connecting duct, outlet bearing is provided with the osculum of two caliber 40mm, be fixed on memorial archway crossbeam by outlet base, contrainjector is installed in outlet inside, outlet bearing rear portion, contrainjector internal diameter 8mm, stop cooling water to flow out from Water cooling device, discharged by osculum.
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| CN104357733B (en) * | 2014-12-02 | 2016-07-06 | 浙江富钢金属制品有限公司 | A kind of production method of stainless screw-thread steel |
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| CN1213592A (en) * | 1998-08-31 | 1999-04-14 | 唐山钢铁集团有限责任公司 | Two-line cutting/rolling tech. for screwed steel |
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