CN106011672A - Philippine-standard straight screw-thread steel and low-cost production technology thereof - Google Patents
Philippine-standard straight screw-thread steel and low-cost production technology thereof Download PDFInfo
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- CN106011672A CN106011672A CN201610619462.0A CN201610619462A CN106011672A CN 106011672 A CN106011672 A CN 106011672A CN 201610619462 A CN201610619462 A CN 201610619462A CN 106011672 A CN106011672 A CN 106011672A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention belongs to the field of steel material preparation and particularly relates to Philippine-standard straight screw-thread steel and a low-cost production technology thereof. The Philippine-standard straight screw-thread steel consists of the following components in percentage by weight: 0.25-0.30% of [C], 0.20-0.30% of [Si], 0.60-0.80% of [Mn], 0.35-0.45% of [Cr], less than or equal to 0.045% of [P], less than or equal to 0.045% of [S] and the balance of Fe and unavoidable impurities, wherein the carbon equivalent is lower than or equal to 0.55%. The production method comprises the steps of converter smelting, soft argon blowing, continuous casting of small square billet and rolling by a rolling mill. In the invention, by reasonably designing the content of the C, Si and Mn elements and adding Cr of certain content, the tensile strength, yield strength and plasticity index of the straight screw-thread steel are effectively improved; and in cooperation with reasonable control on the heating temperature and rolling technology, the cost of the produced Philippine-standard straight screw-thread steel is low, water crossing is not needed, and the technical requirements of the Philippine-standard screw-thread steel are met.
Description
Technical field
The invention belongs to ferrous materials and make field, relate in particular to a kind of luxuriant and rich with fragrance mark vertical bar screw-thread steel and low cost is raw
Production. art.
Background technology
Vertical bar screw-thread steel is the reinforcing bar that surface is with ribbing, also known as Ribbed Bar, generally with 2 road longitudinal rib and the most equal
The cross rib of even distribution.The profile of cross rib is spiral type, herringbone, crescent 3 kinds.Represent with the millimeter of nominal diameter.With ribbing
The nominal diameter of reinforcing bar is equivalent to the nominal diameter of the equal plain bar of cross section.Ribbed Bar is primarily subjected in concrete
Tension, due to the effect of rib, and concrete has bigger cementitiousness, thus can preferably bear the effect of external force.
Screw-thread steel belongs to construction(al)steel, is widely used in the civil engineering construction such as house, bridge, road.Greatly from highway,
The public utilities such as railway, bridge, culvert, tunnel, flood control, dam, the little basis to building construction, beam, post, wall, plate, screw-thread steel
It is all indispensable structural material, it is desirable to vertical bar has high intensity, good toughness, good weldability, good prolonging
Stretch the feature such as rate, certain corrosion resistance.Construction(al)steel occupies very important status in iron and steel consumption market, the whole world, and screw thread
Steel is the ferrous materials that building trade is common, usage amount is maximum.Along with deepening continuously of developing country's urbanization degree, base
Infrastructure is built, the flourish demand to screw-thread steel of real estate is strong.Reinforced concrete structure remains current and future
The primary structure form of developing country's building in considerably long period.Therefore, it is expected to screw-thread steel demand and yield will
Keep higher level, in order to expand international business, improve product competitiveness in the market, exploitation phenanthrene mark screw-thread steel have wide before
Scape.
At present, external screw-thread steel market is respectively provided with corresponding national standard, but tensile strength is required higher by luxuriant and rich with fragrance mark, and visitor
Family does not allow to wear water, and owing in vertical bar composition, carbon content is higher, and containing the chromium of 0.35%～0.45%, chromium can refine crystalline substance
Grain, thus improve performance further, if but production process uses inappropriate technology, can be to other mechanical performance indexs such as elongation percentage
Adversely affect, the difficulty that welding performance is qualified can be strengthened simultaneously.Owing to user requires to obtain high mechanical property, good
The final products of surface quality, welding performance and plasticity index, thus vertical bar should have reasonable, stable chemical composition, high
Mechanical property and reasonably Deflection.Its key technology be to ensure that chemical composition and mechanical property qualified while, as
Where under low-cost production, be prevented effectively from the welding that vertical bar causes because of mother metal reason during user uses do not conform to, plasticity not
Get well, get rusty, be also the common difficulty that phenanthrene marks that the associated production producer of screw-thread steel is run at present.
At present, the technical scheme relating to hot-rolled reinforced bar in domestic Chinese patent database is more, but there is no and relate to luxuriant and rich with fragrance mark directly
The content of bar screw-thread steel.
Summary of the invention
Present invention aims to above technical barrier, by rational designing chemical composition, technological design and parameter
Select, it is provided that a kind of luxuriant and rich with fragrance mark vertical bar screw-thread steel and low cost production thereof thereof, it is ensured that this steel yield strength Rel >=300MPa, anti-
Tensile strength Rm >=500MPa, percentage elongation A200>=20%, and with low cost, vertical bar welding performance and plasticity index are well, finally reach
To wire rod while meeting mechanical property, it is to avoid vertical bar in use because of mother metal reason cause welding not conform to, plasticity not
Get well, the purpose such as get rusty.
To achieve these goals, a kind of luxuriant and rich with fragrance mark vertical bar screw-thread steel involved in the present invention, its chemical analysis by weight hundred
Mark is calculated as: [C]≤0.30%, [Mn]≤1.20%, [Cr] >=0.30%, [P]≤0.050%, [S]≤0.050%, remaining
For Fe and inevitable impurity, carbon equivalent≤0.55%.
Preferably, its chemical analysis percentage is: [C]: 0.25～0.30%, [Si]: 0.20～0.30%,
[Mn]: 0.60～0.80%, [Cr]: 0.35～0.45%, [P]≤0.045%, [S]≤0.045%, remaining is Fe and can not
The impurity avoided, carbon equivalent 0.40～0.50%, wherein, luxuriant and rich with fragrance mark screw-thread steel carbon equivalent (%) computing formula is: carbon+manganese/6+ copper/
40+ nickel/20+ chromium/10-molybdenum/50-vanadium/10.
Present component design reason:
C is intensified element important, cheap in steel, improves the intensity of steel by forming solid solution tissue in steel, but
Too high levels can make the welding performance of steel reduce.The present invention is preferably 0.25～0.30%；
Si can improve the intensity of steel, but too high levels can make the plasticity of steel and toughness reduce.The present invention is preferably 0.20
～0.30%；
Mn can play the effect of solution strengthening, but the too high easy induction segregation of Fe content, and increase production cost.For guaranteeing
Intensity and control production cost, be preferably 0.60～0.80% in the present invention；
Cr can improve the intensity of steel, and have corrosion resistant effect when Cr content is more than 0.30%, but simultaneously can shadow
Ring weldability and the tissue of steel.The present invention is preferably 0.35～0.45%；
P, S are the harmful element in steel, are preferably P≤0.045%, S≤0.045% in the present invention.
The invention provides the production method of a kind of above-mentioned luxuriant and rich with fragrance mark vertical bar screw-thread steel, blow including converter smelting operation, argon station
Nitrogen operation, continuous small-billet casting operation and rolling process step, concrete operations are as follows:
(1) converter adds steelmaking feed and carries out high rifle position and smelt, and uses the stirring of omnidistance bottom blowing nitrogen, controls tapping [C] 0.08
～0.20%, [P]≤0.040% of tapping, tap 1/4 time add carborundum, aluminum cake, alloy, and alloy with steel stream successively order
Toasting before using, tapping process uses slide plate pushing off the slag operation, and the tapping time is 4～5min, and tapping carburetting is joined by lower limit.
As preferably, the steelmaking feed used in step (1) is steel scrap, the pig iron and molten iron, and steel scrap accounts for described steelmaking feed
The 3%～5% of gross weight, the pig iron accounts for the 7%～10% of described steelmaking feed gross weight, total charge weight 130 of described steelmaking feed～
140t/ stove, converter smelting 14～16min, tapping temperature is 1650～1700 DEG C, and tapping uses pushing off the slag operation, and the lower quantity of slag does not surpasses
Cross 50mm；
As preferably, the alloy described in step (1) is silicomanganese, ferrosilicon and high carbon ferro-chrome, wherein, relative to described steel-making
The addition of raw material, carborundum is 0.6～1.0kg/t, aluminum cake 0.20～0.50kg/t, silicomanganese 9.6～10.4kg/t, ferrosilicon
1.5～1.7kg/t, high carbon ferro-chrome 6.2～6.8kg/t；
(2) after molten steel enters argon station, big argon amount Argon (diameter 200～400mm is stirred in molten steel face), feed after 3 minutes
Proper amount of silicon calcium line, turns argon flow amount (diameter 50～100mm is stirred in molten steel face) down, carries out the operation of Ladle Bottom soft blow argon, it is ensured that slag
Wriggling in face, molten steel is the most exposed；
Further, the stirring pressure 1.0～1.2MPa of big argon amount described in step (2), flow 250～350NL/min,
Feeding the silicon-calcium wire of 30～100m/ stoves after 3 minutes, described soft blow argon stirring pressure is adjusted to 0.3～0.4MPa, flow 60～
80NL/min, described soft argon blowing time >=8 minute, total argon blowing time >=12 minute；
(3) continuous casting working procedure uses whole process protection casting, opens and waters heat 1595～1625 DEG C, even waters heat 1575～1595
DEG C, wrapping during in continuous casting, bag uses quick change, mouth of a river diameter >=30mm, casting speed control is at 1.90 ± 0.05m/min；
Crystallizer uses crystallizer protecting residue, and a cold water flow is 105 ± 10m3/ h, water temperature difference 6.0～8.5 DEG C, two is cold
Strong cold water distribution pattern in employing；
As preferably, in step (3), continuous casting whole process protection is cast, the envelope protection of big bag long nozzle argon, and middle bag uses coverture
Covering with carbonization rice husk bilayer, described use time≤28 hour, the described mouth of a river uses time 6.5～7.5h, described crystallizer
Covering slag uses west to protect special HRB400 covering slag, and basicity is R=0.70～0.75, fusing point 1190～1230 DEG C, and viscosity is
1.25～1.45Pa.S/1300 DEG C；A liquid slag layer thickness is measured, it is ensured that the liquid slag layer degree of depth is 6～9mm every 4 hours,
Further, described in step (3) in strong cold water distribution pattern, specific water 1.0L/kg, two roll segment cold, sufficient are equal
For full water cooling but, it is ensured that straightening section temperature is more than 980 DEG C；
(4) rolling process controls the parameters such as furnace temp, mill speed, throwing steel temperature well,
As preferably, the heating furnace two-stage nitration top temperature 890 ± 40 DEG C described in step (4), heating furnace primary reformer top temperature
Spend 1050 ± 40 DEG C: soaking zone furnace temperature 1160～1220 DEG C, start rolling temperature 1090 ± 30 DEG C, rolls speed 11.5～12.5m/min, throws
Steel temperature 960 ± 15 DEG C, Deflection-2.0～-3.0.
The beneficial effects of the present invention is:
The present invention is designed to the cheap carbon of the preferred high level of timesharing and improves intensity index, adds appropriate chromium element
Replace v element, i.e. can further improve intensity index, certain corrosion resisting property can be obtained again, for follow-up do not wear water and other
The design of rolling mill practice provides advantage, meets user and phenanthrene mark vertical bar screw-thread steel does not allows to wear the use demand of water,
Overcome vertical bar screw-thread steel and weld, present in user's use process, problems such as not conforming to, plasticity is bad, get rusty.
By the alloy after controlling higher tapping temperature, selecting baking, control argon blowing time and flow, control are tapped
Carbon, and tapping carburetting joined by lower limit, controls reasonably to roll speed, the throwing means such as steel temperature and less negative common difference to overcome addition
The excessive impact casting of temperature drop that chromium element brings, add chromium carburetting and affect plasticity index and welding performance, add chromium and easily generate martensite
Tissue causes the adverse effects such as fracture.
Present invention process, compared with existing Technology, has simple to operate, and production efficiency is high, and the product cost of production is low
Honest and clean, surface quality is good, non-corrosive, and the features such as mechanical property, plasticity index and welding performance index are good improve product
The market competitiveness, has significant economic benefit and social benefit.
Detailed description of the invention
Production technology is summarized as follows:
120t converter smelting → argon station soft blow argon → continuous small-billet casting (160*160mm2) → mill milling.
Embodiment 1
(1) steelmaking feed that converter uses is steel scrap, the pig iron and molten iron, and steel scrap accounts for the 4% of described steelmaking feed gross weight, raw
Ferrum accounts for the 8.5% of described steelmaking feed gross weight, total charge weight 135t/ stove；
(2) using omnidistance bottom blowing nitrogen stirring in converter steelmaking process, duration of blast is 15 minutes, and tap [C] 0.15%, goes out
Steel [P] 0.035%, tapping temperature 1680 DEG C, tap 1/4 time with steel stream successively order add carborundum be 0.8kg/t, aluminum cake
Toast before 0.40kg/t, silicomanganese 10.0kg/t, ferrosilicon 1.6kg/t, high carbon ferro-chrome 6.4kg/t, and alloy use, tapping process
Middle employing pushing off the slag operates, and the lower quantity of slag is less than 50mm, and the tapping time is 4.5min, and tapping carburetting is joined by lower limit；
(3), after molten steel enters argon station, (molten steel face is stirred for big argon amount Argon stirring pressure 1.1MPa, flow 300NL/min
Diameter 200～400mm), feed proper amount of silicon calcium line after 3 minutes, turn argon flow amount down, soft blow argon stirring pressure is adjusted to
0.35MPa, flow 70NL/min (diameter 50～100mm is stirred in molten steel face), carry out the operation of Ladle Bottom soft blow argon, it is ensured that the top of the slag is compacted
Dynamic, molten steel is the most exposed, soft argon blowing time 10 minutes, total argon blowing time 15 minutes；
(4) continuous casting working procedure uses whole process protection casting, the envelope protection of big bag long nozzle argon, and middle bag uses in quick change and wraps, uses
Coverture and carbonization rice husk bilayer cover, and use 26 hours time, middle water-coating port diameter >=30mm, and the mouth of a river uses time 7h；Knot
Brilliant device uses crystallizer protecting residue, and crystallizer protecting residue uses west to protect special HRB400 covering slag, and basicity is R=0.72, fusing point
1210 DEG C, viscosity is 1.35Pa.S/1300 DEG C；Measuring a liquid slag layer thickness every 4 hours, the liquid slag layer degree of depth is 6～9mm；
(5) this heat waters heat for opening, bull ladle temperature 1605 DEG C after soft blow, and the degree of superheat is 35 DEG C, pulling rate 1.90m/min,
One cold water flow is 105 ± 10m3/ h, water temperature difference 6.0～8.5 DEG C, strong cold water distribution pattern, specific water 1.0L/ in two cold employings
Kg, two roll segment cold, sufficient are full water cooling but；Continuous casting billet straightening section temperature is more than 980 DEG C；
(6) rolling process controls the parameters such as furnace temp, mill speed, throwing steel temperature well, heating furnace two-stage nitration furnace roof temperature
Spend 892 DEG C, heating furnace primary reformer top temperature 1055 DEG C: soaking zone furnace temperature 1189 DEG C, start rolling temperature 1093 DEG C, rolls speed 12.0m/
Min, throws steel temperature 961 DEG C, Deflection-2.5.
Embodiment 2
Steel scrap accounts for the 4.5% of described steelmaking feed gross weight, and the pig iron accounts for the 8.0% of described steelmaking feed gross weight, total charge weight
136t/ stove, remaining operation is same as in Example 2.
Embodiment 3
Tapping [C]: 0.14%, tap [P] 0.030%, and tapping temperature 1675 DEG C, remaining operation is same as in Example 2.
Embodiment 4
Soft argon blowing time 12 minutes, total argon blowing time 16 minutes, remaining operation is same as in Example 2.
Embodiment 5
Soaking zone furnace temperature 1585 DEG C, start rolling temperature 1090 DEG C, roll speed 12.0m/min, throw steel temperature 958 DEG C, remaining operation
Same as in Example 2.
Comparative example 1
West is used to protect special HRB400 covering slag, (basicity R=0.72, fusing point in crystallizer in example 1 step (4)
1210 DEG C, viscosity 1.35 (Pa.s/1300 DEG C) is revised as the low-carbon steel protecting slag that Xixia smelting material is special, (basicity R=1.05, molten
Point 1153 DEG C, viscosity 0.875 (Pa.s/1300 DEG C), other conditions are with embodiment 1.The final continuous casting billet prepared is examined
Looking into, continuous casting billet quality is undesirable, and surface exists the defect such as slag runner, fine cracks, and the final steel prepared are carried out surface quality
Inspection, there is many places crackle in vertical bar surface, user phenomenon of rupture occurs during using, and elongation percentage is on the low side.
Comparative example 2
It is revised as " rolling speed 13m/min, throwing steel by example 1 step (6) " rolls speed 12.0m/min, throw steel temperature 961 DEG C "
Temperature 1010 DEG C ", other conditions are with embodiment 1.The final steel prepared are carried out mechanics properties testing, and surrender is strong after testing
Degree Rel:268MPa；Tensile strength Rm:456MPa, far below the mechanical property of the steel of preparation in the embodiment of the present invention.
Comparative example 3
It is revised as " rolling speed 11m/min, throwing steel by example 1 step (6) " rolls speed 12.0m/min, throw steel temperature 961 DEG C "
Temperature 900 DEG C ", other conditions are with embodiment 1.The final steel prepared are carried out surface and metallographic structure detection, after testing
Vertical bar surface oxidisation is serious, and metallographic structure exists martensitic structure.
The chemical composition of 275W, performance and metallographic structure obtained by embodiment 1～5 are respectively as shown in Tables 1 and 2
The chemical composition (wt/%) of the steel prepared by table 1 example 1～5
(steel for example 1～5 preparation is tested for table 2 275W performance and metallographic structure.)
Claims (9)
1. a luxuriant and rich with fragrance mark vertical bar screw-thread steel, it is characterised in that: the chemical analysis percentage by weight of described luxuriant and rich with fragrance mark vertical bar screw-thread steel
Number be calculated as, [C]≤0.30%, [Mn]≤1.20%, [Cr] >=0.30%, [P]≤0.050%, [S]≤0.050%, remaining be
Fe and inevitable impurity, carbon equivalent≤0.55%.
2. luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 1, it is characterised in that: the chemistry one-tenth of described luxuriant and rich with fragrance mark vertical bar screw-thread steel
Part percentage is, [C] 0.25～0.30%, [Si] 0.20～0.30%, [Mn] 0.60～0.80%, [Cr] 0.35
～0.45%, [P]≤0.045%, [S]≤0.045%, remaining is Fe and inevitable impurity, carbon equivalent 0.41～
0.50%, wherein, luxuriant and rich with fragrance mark screw-thread steel carbon equivalent (%) computing formula is: carbon+manganese/6+ copper/40+ nickel/20+ chromium/10-molybdenum/50-
Vanadium/10.
3. the production technology of a luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 1, it is characterised in that: described preparation method
Including converter smelting operation, soft blow argon operation, continuous casting working procedure and rolling process, concrete operations are:
(1) converter adds steelmaking feed and carries out high rifle position and smelt, and uses the stirring of omnidistance bottom blowing nitrogen, control tapping [C] 0.08～
0.20%, [P]≤0.040% of tapping, tap 1/4 time add carborundum, aluminum cake, alloy with steel stream successively order, and alloy makes
Toasting with front, tapping process uses slide plate pushing off the slag operation, and the tapping time is 4～5min, and tapping carburetting is joined by lower limit；
(2), after molten steel enters argon station, big argon amount Argon, wherein, diameter 200～400mm is stirred in molten steel face, feeds after 3 minutes
Proper amount of silicon calcium line, turns argon flow amount down, and wherein, diameter 50～100mm is stirred in molten steel face, carries out the operation of Ladle Bottom soft blow argon, really
Guarantor's top of the slag is wriggled, and molten steel is the most exposed；
(3) continuous casting working procedure uses whole process protection casting, opens and waters heat 1595～1625 DEG C, even waters heat 1575～1595 DEG C, even
Wrapping during in casting, bag uses quick change, mouth of a river diameter >=30mm, casting speed control is at 1.90 ± 0.05m/min；
Crystallizer uses crystallizer protecting residue, and a cold water flow is 105 ± 10m3/ h, water temperature difference 6.0～8.5 DEG C, in two cold employings
Strong cold water distribution pattern；
(4) rolling process controls furnace temp, mill speed, throwing steel temperature well.
4. the production technology of luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 3, it is characterised in that: the refining used in step (1)
Steel raw material is steel scrap, the pig iron and molten iron, and steel scrap accounts for the 3%～5% of described steelmaking feed gross weight, and it is total that the pig iron accounts for described steelmaking feed
The 7%～10% of weight, total charge weight 130～140t/ stove of described steelmaking feed, converter smelting 14～16min, tapping temperature is
1650～1700 DEG C.
5. the production technology of luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 3, it is characterised in that: the conjunction described in step (1)
Gold is silicomanganese, ferrosilicon and high carbon ferro-chrome, wherein, relative to the addition of described steelmaking feed, carborundum is 0.6～1.0kg/t,
Aluminum cake 0.20～0.50kg/t, silicomanganese 9.6～10.4kg/t, ferrosilicon 1.5～1.7kg/t, high carbon ferro-chrome 6.2～6.8kg/t.
6. the production technology of luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 3, it is characterised in that: in step (2), big argon amount
Stirring pressure 1.0～1.2MPa, flow 250～350NL/min, feed the silicon-calcium wire of 30～100m/ stoves after 3 minutes, described soft
Argon stirring pressure is adjusted to 0.3～0.4MPa, and flow 60～80NL/min, described soft argon blowing time >=8 minute, during total Argon
Between >=12 minutes.
7. the production technology of luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 3, it is characterised in that: in step (3), continuous casting is omnidistance
During protective casting, the envelope protection of big bag long nozzle argon, middle bag uses coverture and carbonization rice husk bilayer to cover, and described middle bag makes
With time≤28 hour, the described mouth of a river uses the time 6.5～7.5h, and described crystallizer protecting residue uses west to protect special HRB400 and protects
Protecting slag, basicity is R=0.70～0.75, fusing point 1190～1230 DEG C, and viscosity is 1.25～1.45Pa.S/1300 DEG C；Little every 4
Time measure a liquid slag layer thickness, it is ensured that the liquid slag layer degree of depth is 6～9mm.
8. the production technology of luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 3, it is characterised in that: in described in step (3)
In strong cold water distribution pattern, specific water 1.0L/kg, two roll segment cold, sufficient are full water cooling but, it is ensured that straightening section temperature is more than 980 DEG C.
9. the production technology of luxuriant and rich with fragrance mark vertical bar screw-thread steel as claimed in claim 3, it is characterised in that: adding described in step (4)
Hot stove two-stage nitration top temperature 890 ± 40 DEG C, heating furnace primary reformer top temperature 1050 ± 40 DEG C, soaking zone furnace temperature 1160～1220
DEG C, start rolling temperature 1090 ± 30 DEG C, roll speed 11.5～12.5m/min, throw steel temperature 960 ± 15 DEG C, Deflection-2.0～-
3.0。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610619462.0A CN106011672A (en) | 2016-07-29 | 2016-07-29 | Philippine-standard straight screw-thread steel and low-cost production technology thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610619462.0A CN106011672A (en) | 2016-07-29 | 2016-07-29 | Philippine-standard straight screw-thread steel and low-cost production technology thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106011672A true CN106011672A (en) | 2016-10-12 |
Family
ID=57133627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610619462.0A Pending CN106011672A (en) | 2016-07-29 | 2016-07-29 | Philippine-standard straight screw-thread steel and low-cost production technology thereof |
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| CN (1) | CN106011672A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107570675A (en) * | 2017-08-01 | 2018-01-12 | 新疆八钢铁股份有限公司 | The pouring technology of improved continuous small-billet casting production medium and high carbon steel |
| CN109487029A (en) * | 2018-11-26 | 2019-03-19 | 山东钢铁股份有限公司 | A kind of method of deoxidation of primary converter production low-carbon low-silicon steel |
| CN110223296A (en) * | 2019-07-08 | 2019-09-10 | 山东建筑大学 | A kind of screw-thread steel detection method of surface flaw and system based on machine vision |
| CN110814308A (en) * | 2019-11-11 | 2020-02-21 | 芜湖新兴铸管有限责任公司 | High-strength deformed steel bar continuous casting and production process |
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| CN104894476A (en) * | 2015-06-12 | 2015-09-09 | 常州东大中天钢铁研究院有限公司 | Steel wire rod for building grid and preparation method of steel wire rod |
| CN104946972A (en) * | 2015-07-07 | 2015-09-30 | 常州东大中天钢铁研究院有限公司 | Steel disc strip for diode lead and production technology of steel disc strip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104894476A (en) * | 2015-06-12 | 2015-09-09 | 常州东大中天钢铁研究院有限公司 | Steel wire rod for building grid and preparation method of steel wire rod |
| CN104946972A (en) * | 2015-07-07 | 2015-09-30 | 常州东大中天钢铁研究院有限公司 | Steel disc strip for diode lead and production technology of steel disc strip |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107570675A (en) * | 2017-08-01 | 2018-01-12 | 新疆八钢铁股份有限公司 | The pouring technology of improved continuous small-billet casting production medium and high carbon steel |
| CN109487029A (en) * | 2018-11-26 | 2019-03-19 | 山东钢铁股份有限公司 | A kind of method of deoxidation of primary converter production low-carbon low-silicon steel |
| CN110223296A (en) * | 2019-07-08 | 2019-09-10 | 山东建筑大学 | A kind of screw-thread steel detection method of surface flaw and system based on machine vision |
| CN110814308A (en) * | 2019-11-11 | 2020-02-21 | 芜湖新兴铸管有限责任公司 | High-strength deformed steel bar continuous casting and production process |
| CN110814308B (en) * | 2019-11-11 | 2022-03-01 | 芜湖新兴铸管有限责任公司 | High-strength deformed steel bar continuous casting and production process |
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