CN110079736A - Uniform low carbon low silicon welding steel of structure property and preparation method thereof - Google Patents
Uniform low carbon low silicon welding steel of structure property and preparation method thereof Download PDFInfo
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- CN110079736A CN110079736A CN201910433970.3A CN201910433970A CN110079736A CN 110079736 A CN110079736 A CN 110079736A CN 201910433970 A CN201910433970 A CN 201910433970A CN 110079736 A CN110079736 A CN 110079736A
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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
- C21C7/0025—Adding carbon material
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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
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/18—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
Abstract
The present invention relates to uniform low carbon low silicon welding steels of structure property and preparation method thereof, belong to field of steel production.The present invention provides the uniform low carbon low silicon welding steels of structure property: molten steel successively being cast, heating steel billet, rolling and stelmor is air-cooled is prepared, the chemical composition comprises the following components in percentage by weight of the molten steel are as follows: C≤0.06%, Si≤0.03%, Mn:0.40-0.70%, P≤0.020%, S≤0.020%, Cr≤0.20%, Ni≤0.30%, Cu≤0.20%, As≤0.020%, surplus are Fe and inevitable impurity.Welding steel produced by the invention has the advantages that even tissue, and wire rod head, middle and end mechanical property is uniform, can satisfy the requirement of direct drawing diameter 2.0-5.0mm core wire stick silk.
Description
Technical field
The present invention relates to uniform low carbon low silicon welding steels of structure property and preparation method thereof, belong to steel production neck
Domain.
Background technique
Welding material is steel " sewing thread " and " binder ", and main raw material(s) is steel, and steel product cost is welding
Shared ratio is higher in material manufacturing cost, and the fluctuation of steel market will directly affect wlding industry cost of raw and production
Product selling price.Different welding materials has different requirements to steel, and kind, the quality of steel influence whether the product of wlding
Quality and new product development.The welding material produced using steel wire for welding, mainly there is welding rod, gas shield welding wire and submerged-arc welding
Silk, flux-cored wire mainly use cold-rolled strip to produce.
Currently, wlding manufacturer drawing process eliminates heat treatment procedure, after steel wire for welding scale removal
Directly carry out drawing, i.e., φ 2.0-5.0mm is pulled to by φ 6.5mm, this just need welding steel have suitable tensile strength,
Higher plasticity and toughness, and can guarantee weld properties and quality, and bubble and splashing cannot be generated in welding.
Steel inclusion easily causes drawing welding wire process to be broken, while being also to cause weld metal defect and spatter
One of the main reasons, so non-metallic inclusion form, size, number etc. should be controlled；In addition, wire rod surface must not have crackle,
It folds, scab, ears or side handles of a utensil layering and being mingled with, allowing to have convex block, the pit, scratch, pitted skin of impression and part, but its depth or height
Degree: B, C class precision wire rod are not greater than 0.10mm；Other accuracy classes are not greater than 0.20mm.
However, even if nonmetal inclusion and disk circle specifications control it is proper in the case where, steel wire for welding also usually because
It is uneven for tissue, performance, as a result there is fracture of wire during drawing core wire stick silk, influences production efficiency.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, it is an object of the invention to
The uniform low carbon low silicon welding steel of structure property is provided.Another object of the present invention is to provide the preparations of the welding steel
Method.
The present invention provides the uniform low carbon low silicon welding steels of structure property: molten steel successively being cast, steel billet adds
Heat, rolling and stelmor is air-cooled is prepared, in which:
The chemical composition comprises the following components in percentage by weight of the molten steel are as follows: C≤0.06%, Si≤0.03%, Mn:0.40-
0.70%, P≤0.020%, S≤0.020%, Cr≤0.20%, Ni≤0.30%, Cu≤0.20%, As≤0.020%, it is remaining
Amount is Fe and inevitable impurity；
The process conditions of the heating steel billet are as follows: by heating steel billet to 1100-1200 DEG C, kept the temperature in 1050-1150 DEG C
1.0-3.0 hours, total heating time was no more than 5.0 hours；
Described 900-1000 DEG C of roll control entry temperature at finishing, 880-930 DEG C of Dual module inlet temperature, laying temperature
880-930℃；
The stelmor is air-cooled to postpone slow cooling mode using air-cooled roller-way, controls air-cooled roller table speed≤0.40m/s.
Wherein, the rolling uses high speed wire rolling.
Further, the chemical composition comprises the following components in percentage by weight of the molten steel are as follows: C:0.04-0.06%, Si:0.018-
0.028%, Mn:0.45-0.60%, P≤0.015%, S≤0.015%, Cr≤0.20%, Ni≤0.30%, Cu≤
0.20%, As≤0.015%, surplus are Fe and inevitable impurity.
Preferably, the weight percent of P is 0.008-0.014%, and the weight percent of S is 0.008-0.014%, Cr's
Weight percent is 0.05-0.06%, and the weight percent of Ni is that the weight percent of 0.04%, Cu is the weight of 0.04%, As
Amount percentage is 0.010-0.011%.
Further, the casting meets at least one of following:
It casts in argon atmosphere；
Liquid steel temperature is 1555-1575 DEG C when casting；
The average cast temperature of molten steel is 1556-1570 DEG C；
The pulling rate of slab is 1.70-2.2m/min；
The average pull rate of slab is 1.80-2.0m/min.
Wherein, molten steel overheat is 20-40 DEG C when casting.
Wherein, the casting is by the way of continuous small-billet casting, in continuous casting step, from ladle-tundish-crystallizer
Overall process protective casting is carried out using immersion long nozzle, covering slag and argon gas, prevent the exposed generation secondary oxidation of molten steel；Control
Casting speed processed stablizes pulling rate, prevents the fluctuation of mold liquid level in 1.70-2.20m/min.
Further, the heating steel billet meets at least one of following:
By heating steel billet to 1160-1200 DEG C；
Steel billet is kept the temperature in 1120-1150 DEG C；
Soaking time is 1.6-2.6 hours；
Total heating time is 3.5-4.5 hours.
Further, the laggard horizontal high voltage water de-scaling of heating steel billet, is rolled later.Wherein, it is carried out after high-pressure water descaling
The rolling of φ 6.5mm disk circle.
Preferably, steel billet is come out of the stove at 1000-1050 DEG C carries out high-pressure water descaling.
Further, at least one of below the air-cooled satisfaction of the stelmor:
Blower and insulation cover are all closed；
Air-cooled roller table speed is controlled in the range of 0.24-0.40m/s；
Preferably, air-cooled roller table speed is controlled in the range of 0.24-0.32m/s；
Each section of roller table speed is respectively 0.24m/s, 0.26m/s, 0.28m/s, 0.30m/s, 0.32m/s.
The present invention provides the preparation methods of the welding steel: molten steel is successively cast, heating steel billet, rolling and
Stelmor it is air-cooled to get；Wherein, the molten steel is obtained by bessemerizing with ladle refining.
Further, described to bessemerize at least one of satisfaction or less:
On the basis of molten iron total weight, by the control of the C content of blowing end point in 0.02-0.04 weight %, P content≤
0.015 weight %, S content≤0.015 weight %；
Carburant, pre-deoxidant, refining slag and silicomangan are added in ladle in tapping process, so that obtaining
Molten steel in, on the basis of the molten steel total weight, C content be 0.03-0.04 weight %, Si content be 0.010-0.020 weight
% is measured, Mn content is 0.35-0.40 weight %；
Preferably, the pre-deoxidant is alfer；
Preferably, relative to molten steel per ton, the additional amount of the pre-deoxidant is 2.5-4.0 kilograms；
Preferably, relative to molten steel per ton, the additional amount of the refining slag is 2.5-4.0 kilograms；
Argon is carried out to ladle after tapping；
Preferably, Argon is carried out to ladle using the pressure of 0.4-1.0MPa；
Preferably, argon blowing time 8-20min.
Further, the ladle refining meets at least one of following:
Refining slag is added, the dosage of refining slag is relative to 2.0-4.0 kilograms of molten steel per ton；
Refining slag is added, controls ladle basicity of slag between 2.0-4.0；
The chemical component of carburant, Antaciron and/or manganeisen adjustment molten steel is added；
Temperature after refining is 1585-1610 DEG C；
Refining time is 35-60 minutes.
Further, the carburant is one or more kinds of in pitch coke, anthracite, carbon dust.
Wherein, the refining slag is the common high basicity slag in this field.
The present invention provides the uniform low carbon low silicon welding steels of structure property, mainly have the advantages that
1, welding steel tensile strength 320-350MPa of the present invention, elongation percentage A can achieve 45.0-52.0%, and section is received
Shrinkage can achieve 80.0-85.0%, meet the requirement of direct drawing diameter 2.0-5.0mm core wire stick silk.
2, welding steel of the present invention has the advantages that even tissue, wire rod head, middle and end mechanical property are uniform.It is mentioned with embodiment 1
For the welding steel of confession, tensile strength Rm differs 2MPa, elongation A difference 1.0%, contraction percentage of area Z difference end to end
1.0%；And welding steel (comparative example 1) head, middle and end tensile strength Rm difference of existing method production is used to reach 14MPa, elongation
A difference 4.0%, contraction percentage of area Z difference 2.0%.
Specific embodiment
The present invention provides the uniform low carbon low silicon welding steels of structure property: molten steel successively being cast, steel billet adds
Heat, rolling and stelmor is air-cooled is prepared, in which:
The chemical composition comprises the following components in percentage by weight of the molten steel are as follows: C≤0.06%, Si≤0.03%, Mn:0.40-
0.70%, P≤0.020%, S≤0.020%, Cr≤0.20%, Ni≤0.30%, Cu≤0.20%, As≤0.020%, it is remaining
Amount is Fe and inevitable impurity；
The process conditions of the heating steel billet are as follows: by heating steel billet to 1100-1200 DEG C, kept the temperature in 1050-1150 DEG C
1.0-3.0 hours, total heating time was no more than 5.0 hours；
Described 900-1000 DEG C of roll control entry temperature at finishing, 880-930 DEG C of Dual module inlet temperature, laying temperature
880-930℃；
The stelmor is air-cooled to postpone slow cooling mode using air-cooled roller-way, controls air-cooled roller table speed≤0.40m/s.
The present invention mainly passes through control C, Si, Mn, P, S content in suitable range, reduces the residual element contents such as As,
Optimize heating steel billet, rolling and the air-cooled process conditions of stelmor simultaneously, hence it is evident that improve welding rod tissue and mechanical property
The plasticity of uniformity, stability (i.e. the poker characteristic of wire rod) and wire rod makes steel have good drawing property, guarantees to draw
Fracture of wire, the welding rod of production do not have excellent welding performance during spike pulling silk.
The solution of the present invention is explained below in conjunction with embodiment.It will be understood to those of skill in the art that following
Embodiment is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.Particular technique or item are not specified in embodiment
Part, it described technology or conditions or is carried out according to the literature in the art according to product description.Agents useful for same or instrument
Production firm person is not specified in device, and being can be with conventional products that are commercially available.
The preparation of the welding steel of the present invention of embodiment 1
Molten iron after desulfurization, vanadium extraction is poured into oxygen top-blown converter to blow, on the basis of molten steel total weight, works as molten steel
It taps immediately into ladle when middle C content is 0.02 weight %, P content be 0.008 weight %, S content is 0.008 weight %.
When tapping, relative to molten steel per ton, first plus 0.15 kilogram of anthracite (C content is >=93 weight %) carries out carburetting, tapping 1/3
Afterwards, relative to molten steel per ton, pre-deoxidant alfer is first added in ladle, and (Al content is 40 weight %, Anyang Heng Wang
Metallurgical Nai Cai Co., Ltd) 4.0 kilograms, then relative to molten steel per ton, 2.5 kilograms of refining slag is added, (Mn content is Mn-Si
68 weight %, Si contents are 18 weight %, the permanent prosperous metallurgy Nai Cai Co., Ltd in Anyang) 1.1 kilograms, Fe-Mn (Mn content for >=
75%, Panzhihua Pan Hong metallurgical product Co., Ltd) 4.7 kilograms, the alloying of the elements such as Si, Mn is carried out, is made in gained molten steel,
On the basis of the total weight of molten steel, it be 0.015 weight %, Mn content is 0.40 weight that C content, which is 0.03 weight %, Si content,
Measure %.
Then, ar blowing refining is carried out to the molten steel in ladle, the time of ar blowing refining is 8 minutes, and argon gas is blown into pressure and is
0.8MPa；After molten steel is sent to LF furnace (130 tons of ladle refining furnaces of electrified heating), slugging is first heated, then relative to per ton
Molten steel is added 2.0 kilograms of refining slag, and to 1620 DEG C, LF refining carries out 35 minutes heating molten steel altogether, and carbon dust, Fe- is then added
The alloys such as Si, Fe-Mn are finely adjusted molten steel composition, make in gained molten steel, on the basis of the total weight of molten steel, C content is
0.04 weight %, Si content be 0.028 weight %, Mn content be 0.60 weight %, P content is that 0.008 weight %, S content is
0.008%, it be 0.04 weight %, Cu content is that 0.04 weight %, As content is that Cr content, which is 0.06 weight %, Ni content,
0.010 weight %.
It is cast the molten steel after ladle refining to obtain steel billet, casts in argon atmosphere and carry out, molten steel is averagely cast
Temperature is 1556 DEG C.The average pull rate of slab is 2.0m/min.
Using pusher-type furnace heating steel billet to 1160 DEG C, 2.6 hours then are kept the temperature at a temperature of 1120 DEG C, it is total to heat
Time is 4.5 hours.Then tapping carries out high-pressure water descaling and wire rod rolling, controls 930 DEG C of entry temperature at finishing, Dual module enters
880 DEG C of temperature, 880 DEG C of laying temperature of mouth.
The blower of Stanermo wind-cooling linear and insulation cover are all closed, each section of roller table speed 0.24m/s, 0.26m/s,
0.28m/s,0.30m/s,0.32m/s.Then wire rod after cooling is subjected to collection volume, bundling and air-cooled.
The detection method of each ingredient is respectively carbon steel and middle-low alloy steel spark source atomic emission spectrometry analysis method, state
Family's standard is GB/T4336.Tissue, grain size and the uniformity testing result of gained steel are shown in Table 2.
The preparation of the welding steel of the present invention of embodiment 2
Molten iron after desulfurization, vanadium extraction is poured into oxygen top-blown converter to blow, on the basis of molten steel total weight, works as molten steel
It taps immediately into ladle when middle C content is 0.03 weight %, P content be 0.010 weight %, S content is 0.011 weight %.
After tapping 1/3, relative to molten steel per ton, pre-deoxidant alfer is first added in ladle, and (Al content is 40 weight %, Anyang
Permanent prosperous metallurgy Nai Cai Co., Ltd, city) 3.5 kilograms, then relative to molten steel per ton, addition 3.2 kilograms of refining slag, Mn-Si (Mn
It is 18 weight % that content, which is 68 weight %, Si contents, the permanent prosperous metallurgy Nai Cai Co., Ltd in Anyang) 1.2 kilograms, (Mn contains Fe-Mn
Amount is >=75%, Panzhihua Pan Hong metallurgical product Co., Ltd) 4.5 kilograms, the alloying of the elements such as Si, Mn is carried out, gained is made
In molten steel, on the basis of the total weight of molten steel, C content is that 0.035 weight %, Si content is that 0.018 weight %, Mn content is
0.38 weight %.
Then, ar blowing refining is carried out to the molten steel in ladle, the time of ar blowing refining is 10 minutes, and argon gas is blown into pressure and is
0.8MPa；After molten steel is sent to LF furnace (130 tons of ladle refining furnaces of electrified heating), slugging is first heated, then relative to per ton
Molten steel is added 3.2 kilograms of refining slag, and to 1635 DEG C, LF refining carries out 50 minutes heating molten steel altogether, and carbon dust, Fe- is then added
The alloys such as Si, Fe-Mn are finely adjusted molten steel composition, make in gained molten steel, on the basis of the total weight of molten steel, C content is
0.05 weight %, Si content be 0.022 weight %, Mn content be 0.52 weight %, P content is that 0.011 weight %, S content is
0.010%, it be 0.04 weight %, Cu content is that 0.04 weight %, As content is that Cr content, which is 0.05 weight %, Ni content,
0.011 weight %.
It is cast the molten steel after ladle refining to obtain steel billet, casts in argon atmosphere and carry out, molten steel is averagely cast
Temperature is 1560 DEG C.The average pull rate of slab is 1.9m/min.
Using pusher-type furnace heating steel billet to 1180 DEG C, 2.0 hours then are kept the temperature at a temperature of 1140 DEG C, it is total to heat
Time is 4.1 hours.Then tapping carries out high-pressure water descaling and wire rod rolling, controls 960 DEG C of entry temperature at finishing, Dual module enters
900 DEG C of temperature, 900 DEG C of laying temperature of mouth.
The blower of Stanermo wind-cooling linear and insulation cover are all closed, each section of roller table speed 0.24m/s, 0.26m/s,
0.28m/s,0.30m/s,0.32m/s.Then wire rod after cooling is subjected to collection volume, bundling and air-cooled.
The detection method of each ingredient is respectively carbon steel and middle-low alloy steel spark source atomic emission spectrometry analysis method, state
Family's standard is GB/T4336.Tissue, grain size and the uniformity testing result of gained steel are shown in Table 2.
The preparation of the welding steel of the present invention of embodiment 3
Molten iron after desulfurization, vanadium extraction is poured into oxygen top-blown converter to blow, on the basis of molten steel total weight, works as molten steel
It taps immediately into ladle when middle C content is 0.04 weight %, P content be 0.013 weight %, S content is 0.014 weight %.
After tapping 1/3, relative to molten steel per ton, pre-deoxidant alfer is first added in ladle, and (Al content is 40 weight %, Anyang
Permanent prosperous metallurgy Nai Cai Co., Ltd, city) 2.6 kilograms, then relative to molten steel per ton, addition 4.0 kilograms of refining slag, Mn-Si (Mn
It is 18 weight % that content, which is 68 weight %, Si contents, the permanent prosperous metallurgy Nai Cai Co., Ltd in Anyang) 1.3, (Mn content is Fe-Mn
>=75%, Panzhihua Pan Hong metallurgical product Co., Ltd) 4.1 kilograms, the alloying of the elements such as Si, Mn is carried out, gained molten steel is made
In, on the basis of the total weight of molten steel, it be 0.020 weight %, Mn content is 0.35 weight that C content, which is 0.04 weight %, Si content,
Measure %.
Then, ar blowing refining is carried out to the molten steel in ladle, the time of ar blowing refining is 15 minutes, and argon gas is blown into pressure and is
0.8MPa；After molten steel is sent to LF furnace (130 tons of ladle refining furnaces of electrified heating), slugging is first heated, then relative to per ton
Molten steel is added 4.0 kilograms of refining slag, and to 1650 DEG C, LF refining carries out 60 minutes heating molten steel altogether, and carbon dust, Fe- is then added
The alloys such as Si, Fe-Mn are finely adjusted molten steel composition, make in gained molten steel, on the basis of the total weight of molten steel, C content is
0.06 weight %, Si content be 0.018 weight %, Mn content be 0.45 weight %, P content is that 0.014 weight %, S content is
0.014%, it be 0.04 weight %, Cu content is that 0.04 weight %, As content is that Cr content, which is 0.05 weight %, Ni content,
0.010 weight %.
It is cast the molten steel after ladle refining to obtain steel billet, casts in argon atmosphere and carry out, molten steel is averagely cast
Temperature is 1570 DEG C.The average pull rate of slab is 1.80m/min.
Using pusher-type furnace heating steel billet to 1200 DEG C, 1.6 hours then are kept the temperature at a temperature of 1150 DEG C, it is total to heat
Time is 3.5 hours.Then tapping carries out high-pressure water descaling and wire rod rolling, controls 1000 DEG C of entry temperature at finishing, Dual module
930 DEG C of inlet temperature, 930 DEG C of laying temperature.
The blower of Stanermo wind-cooling linear and insulation cover are all closed, each section of roller table speed 0.24m/s, 0.26m/s,
0.28m/s,0.30m/s,0.32m/s.Then wire rod after cooling is subjected to collection volume, bundling and air-cooled.
The detection method of each ingredient is respectively carbon steel and middle-low alloy steel spark source atomic emission spectrometry analysis method, state
Family's standard is GB/T4336.Tissue, grain size and the uniformity testing result of gained steel are shown in Table 2.
Comparative example 1 prepares welding steel using existing method
Molten iron after desulfurization, vanadium extraction is poured into oxygen top-blown converter to blow, on the basis of molten steel total weight, works as molten steel
It taps immediately into ladle when middle C content is 0.05 weight %, P content be 0.013 weight %, S content is 0.014 weight %.
After tapping 1/3, relative to molten steel per ton, pre-deoxidant alfer is first added in ladle, and (Al content is 40 weight %, Anyang
Permanent prosperous metallurgy Nai Cai Co., Ltd, city) 3.5 kilograms, then relative to molten steel per ton, addition 4.0 kilograms of refining slag, Mn-Si (Mn
It is 18 weight % that content, which is 68 weight %, Si contents, the permanent prosperous metallurgy Nai Cai Co., Ltd in Anyang) 1.2 kilograms, (Mn contains Fe-Mn
Amount is >=75%, Panzhihua Pan Hong metallurgical product Co., Ltd) 4.8 kilograms, the alloying of the elements such as Si, Mn is carried out, gained is made
In molten steel, on the basis of the total weight of molten steel, C content is that 0.05 weight %, Si content is that 0.020 weight %, Mn content is
0.40 weight %.
Then, ar blowing refining is carried out to the molten steel in ladle, the time of ar blowing refining is 8 minutes, and argon gas is blown into pressure and is
0.8MPa；After molten steel is sent to LF furnace (130 tons of ladle refining furnaces of electrified heating), slugging is first heated, then relative to per ton
Molten steel is added 4.2 kilograms of refining slag, and to 1645 DEG C, LF refining carries out 45 minutes heating molten steel altogether, and carbon dust, Fe- is then added
The alloys such as Si, Fe-Mn are finely adjusted molten steel composition, make in gained molten steel, on the basis of the total weight of molten steel, C content is
0.06 weight %, Si content be 0.018 weight %, Mn content be 0.45 weight %, P content is that 0.014 weight %, S content is
0.014%, it be 0.04 weight %, Cu content is that 0.04 weight %, As content is that Cr content, which is 0.05 weight %, Ni content,
0.015 weight %.
It is cast the molten steel after ladle refining to obtain steel billet, casts in argon atmosphere and carry out, molten steel is averagely cast
Temperature is 1575 DEG C.The average pull rate of slab is 2.2m/min.
Using pusher-type furnace heating steel billet to 1220 DEG C, 2.0 hours then are kept the temperature at a temperature of 1180 DEG C, it is total to heat
Time is 3.5 hours.Then tapping carries out high-pressure water descaling and wire rod rolling, controls 1000 DEG C of entry temperature at finishing, Dual module
960 DEG C of inlet temperature, 960 DEG C of laying temperature.
The blower of Stanermo wind-cooling linear and insulation cover are all closed, each section of roller table speed 0.24m/s, 0.26m/s,
0.28m/s,0.30m/s,0.32m/s.Then wire rod after cooling is subjected to collection volume, bundling and air-cooled.
The detection method of each ingredient is respectively carbon steel and middle-low alloy steel spark source atomic emission spectrometry analysis method, state
Family's standard is GB/T4336.Tissue, grain size and the uniformity testing result of gained steel are shown in Table 2.
Measuring mechanical property: welding steel prepared by embodiment 1-3 and comparative example 1 carries out mechanicalness by standard sample
It can test, wherein tensile property is carried out according to GB/T228 metal material tensile testing at ambient temperature, detects tensile strength respectively
Rm, elongation A, contraction percentage of area Z.As a result it see the table below:
1 measuring mechanical property result of table
Note: data are that wire rod head, middle and end take double sample inspection results in table.
Tissue, grain size and the uniformity testing result of 2 steel of table
Note: grain size is mean grain size in table.
From table 1, table 2 it can be seen that compared with comparative example 1, the welding steel even tissue of embodiment 1-3, in wire rod head
Tail mechanical property uniformity is significantly superior.For example, the Rm of tensile strength end to end for the welding steel that embodiment 1 provides differs 2MPa,
Elongation A difference 1.0%, contraction percentage of area Z difference 1.0%；And the head, middle and end tensile strength for the welding steel that comparative example 1 provides
Rm difference reaches 14MPa, elongation A difference 4.0%, contraction percentage of area Z difference 2.0%.
It should be noted that particular features, structures, materials, or characteristics described in this specification can any one or
It can be combined in any suitable manner in multiple embodiments.In addition, without conflicting with each other, those skilled in the art can incite somebody to action
The feature of difference embodiment described in this specification and different embodiments is combined.
Claims (10)
1. the uniform low carbon low silicon welding steel of structure property, it is characterized in that: molten steel is successively cast, heating steel billet, is rolled
System and stelmor is air-cooled is prepared, in which:
The chemical composition comprises the following components in percentage by weight of the molten steel are as follows: C≤0.06%, Si≤0.03%, Mn:0.40-0.70%, P
≤ 0.020%, S≤0.020%, Cr≤0.20%, Ni≤0.30%, Cu≤0.20%, As≤0.020%, surplus be Fe and
Inevitable impurity；
The process conditions of the heating steel billet are as follows: by heating steel billet to 1100-1200 DEG C, in 1050-1150 DEG C of heat preservation 1.0-3.0
Hour, total heating time is no more than 5.0 hours；
Described 900-1000 DEG C of roll control entry temperature at finishing, 880-930 DEG C of Dual module inlet temperature, laying temperature 880-
930℃；
The stelmor is air-cooled to postpone slow cooling mode using air-cooled roller-way, controls air-cooled roller table speed≤0.40m/s.
2. welding steel as described in claim 1, it is characterized in that: the chemical composition comprises the following components in percentage by weight of the molten steel are as follows:
C:0.04-0.06%, Si:0.018-0.028%, Mn:0.45-0.60%, P≤0.015%, S≤0.015%, Cr≤
0.20%, Ni≤0.30%, Cu≤0.20%, As≤0.015%, surplus are Fe and inevitable impurity；Preferably, P
Weight percent is 0.008-0.014%, and the weight percent of S is 0.008-0.014%, and the weight percent of Cr is 0.05-
The weight percent that the weight percent that the weight percent of 0.06%, Ni are 0.04%, Cu is 0.04%, As is 0.010-
0.011%.
3. welding steel as claimed in claim 1 or 2, it is characterized in that: at least one of below casting satisfaction:
It casts in argon atmosphere；
Liquid steel temperature is 1555-1575 DEG C when casting；
The average cast temperature of molten steel is 1556-1570 DEG C；
The pulling rate of slab is 1.70-2.2m/min；
The average pull rate of slab is 1.80-2.0m/min.
4. welding steel as claimed in claim 1 or 2, it is characterized in that: at least one of below heating steel billet satisfaction:
By heating steel billet to 1160-1200 DEG C；
Steel billet is kept the temperature in 1120-1150 DEG C；
Soaking time is 1.6-2.6 hours；
Total heating time is 3.5-4.5 hours.
5. welding steel as claimed in claim 1 or 2, it is characterized in that: the laggard horizontal high voltage water de-scaling of heating steel billet, carries out later
Rolling；Preferably, steel billet is come out of the stove at 1000-1050 DEG C carries out high-pressure water descaling.
6. welding steel as claimed in claim 1 or 2, it is characterized in that: at least one of below the air-cooled satisfaction of the stelmor:
Blower and insulation cover are all closed；
Air-cooled roller table speed is controlled in the range of 0.24-0.40m/s；
Preferably, air-cooled roller table speed is controlled in the range of 0.24-0.32m/s；
Each section of roller table speed is respectively 0.24m/s, 0.26m/s, 0.28m/s, 0.30m/s, 0.32m/s.
7. the preparation method of welding steel described in claim 1~6 any one, it is characterized in that: molten steel is successively cast,
Heating steel billet, rolling and stelmor it is air-cooled to get；Wherein, the molten steel is obtained by bessemerizing with ladle refining.
8. preparation method as claimed in claim 7, it is characterized in that: described bessemerize at least one of satisfaction or less:
On the basis of molten iron total weight, the C content of blowing end point is controlled in 0.02-0.04 weight %, P content≤0.015 weight
Measure %, S content≤0.015 weight %；
Carburant, pre-deoxidant, refining slag and silicomangan are added in ladle in tapping process, so that in obtained steel
In water, on the basis of the molten steel total weight, C content is that 0.03-0.04 weight %, Si content is 0.010-0.020 weight %,
Mn content is 0.35-0.40 weight %；
Preferably, the pre-deoxidant is alfer；
Preferably, relative to molten steel per ton, the additional amount of the pre-deoxidant is 2.5-4.0 kilograms；
Preferably, relative to molten steel per ton, the additional amount of the refining slag is 2.5-4.0 kilograms；
Argon is carried out to ladle after tapping；
Preferably, Argon is carried out to ladle using the pressure of 0.4-1.0MPa；
Preferably, argon blowing time 8-20min.
9. preparation method as claimed in claim 7, it is characterized in that: at least one of below ladle refining satisfaction:
Refining slag is added, the dosage of refining slag is relative to 2.0-4.0 kilograms of molten steel per ton；
Refining slag is added, controls ladle basicity of slag between 2.0-4.0；
The chemical component of carburant, Antaciron and/or manganeisen adjustment molten steel is added；
Temperature after refining is 1585-1610 DEG C；
Refining time is 35-60 minutes.
10. preparation method as claimed in claim 8 or 9, it is characterized in that: the carburant is selected from pitch coke, anthracite, carbon dust
Middle one or more.
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| CN111187970A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Preparation method of hot-rolled wire rod BGHS380 for welding rod |
| CN111647811A (en) * | 2020-05-29 | 2020-09-11 | 鞍钢股份有限公司 | Welding wire steel wire rod suitable for pickling-free shelling process and production method |
| CN112157121A (en) * | 2020-09-25 | 2021-01-01 | 攀钢集团研究院有限公司 | Preparation method of 30MnSi hot-rolled wire rod |
| CN115433879A (en) * | 2022-08-18 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Low-carbon low-silicon free-cutting steel with uniform structure performance and preparation method thereof |
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| CN111187970A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Preparation method of hot-rolled wire rod BGHS380 for welding rod |
| CN111647811A (en) * | 2020-05-29 | 2020-09-11 | 鞍钢股份有限公司 | Welding wire steel wire rod suitable for pickling-free shelling process and production method |
| CN112157121A (en) * | 2020-09-25 | 2021-01-01 | 攀钢集团研究院有限公司 | Preparation method of 30MnSi hot-rolled wire rod |
| CN112157121B (en) * | 2020-09-25 | 2022-07-19 | 攀钢集团研究院有限公司 | Preparation method of 30MnSi hot-rolled wire rod |
| CN115433879A (en) * | 2022-08-18 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Low-carbon low-silicon free-cutting steel with uniform structure performance and preparation method thereof |
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