CN102268597A - Steel for hollow rivet and production method thereof - Google Patents
Steel for hollow rivet and production method thereof Download PDFInfo
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Abstract
The invention relates to steel for the hollow rivet and a production method thereof. The steel comprises the following components by weight percent: less than or equal to 0.006% of C, less than or equal to 0.01% of Si, 0.15-0.25% of Mn, 0.08-0.15% of Ti, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.0040% of N and the balance of iron and inevitable impurities. The production method comprises the following steps: injecting magnesium hot metal to desulphurize; smelting in a converter; performing slag-stopping tapping; slagging again in a ladle; blowing argon in the whole process; refining; deoxidizing; desulphurizing; micro-alloying; finely adjusting titanium and manganese; performing calcium treatment; performing continuous casting; rolling to obtain a square billet; heating the square billet; performing rough rolling on a high-speed line; performing finish rolling on another high-speed line; silking; performing delay chilling on a Stelmor line; and performing air cooling to the room temperature for standby. The steel for the hollow rivet has good cold stamping property and cold tear resistance and good cold ductility and can fully meet the user requirement.
Description
Technical field
The present invention relates to rivet with steel and production method, specifically belong to tubular rivet steel and production method thereof.
Background technology
Widely used hollow and semitubular rivet in the industries such as mechanical engineering manufacturing and toy production mainly was to be stamped to form by aluminium in the past.Tubular rivet intensity by the aluminium punching press is low, wear no resistance, security is bad, and aluminium is also easily work hardening in the course of processing, and deep drawing quality is poor.
At present, the basic technology of making tubular rivet is: biscuit one pickling, phosphatization, saponification, oven dry one cold-drawn one (recrystallization annealing) essence are pulled out a multistage cold former extrusion molding (comprise shearing blanking, heading, towards a hollow) plating nickel on surface or zinc-plated one " beating flower " test one packing is put in storage
Can find out that from the technology of present production tubular rivet this steel will carry out cold stretching distortion, multi-station cold-heading distortion and punching press distortion in the course of processing.The user also will carry out " beating flower " when this rivet is assembled.Therefore the cold deformation performance (plasticity) of this steel is good especially, also has cold stamping and anti-cold tearing property all fine, so be used to make should satisfying of tubular rivet with steel wire rod:
(1) steel is pure;
(2) cold punching performance and cold drawing performance will be got well;
(3) cold ductility will be got well.
By retrieval, find " defect analysis of the ultra low-carbon steel tubular rivet " open source literature that is published on 2004 o. 11th " iron and steel ", the carbon of its disclosed steel and the upper limit of silicon are all than higher, because carbon and silicon are to force worker's hardening element, therefore, when titanium content is too low, the grain growth in the time of will occurring heating, make the crystal grain of the finished product thick, can cause the finished product to beat flange cracking when colored.Generation for the slippage crack defect: because slippage crackle (L) is by existing the solute atoms air mass to form after being out of shape in the steel, carbon, nitrogen content in steel are higher, and titanium content is when low, just have carbon, nitrogen solute atoms air mass in the steel, product will produce slippage crackle (L) when " beating flower "; As for descending defectives such as honest, that flange is incomplete, since laying temperature is too high cause the intensity of steel low due to, beginning temperature through the continuous cooling transformation of this steel of test determination is 877 ℃, obviously Heating temperature and the laying temperature of implementing in the document is all too high, easily make the crystal grain of steel bigger than normal, intensity is on the low side, thereby produces defectives such as honest down, that flange is incomplete when making product " beat flower ".
Summary of the invention
The objective of the invention is to solve the present deficiency that aspect steel, exists at tubular rivet, provide a kind of cold stamping and anti-cold tearing property good, tubular rivet steel and production method thereof that cold extension performance is good.
Realize the technical measures of above-mentioned purpose:
The tubular rivet steel, its component and weight percent are: C≤0.006%, Si≤0.01%, Mn:0.15～0.25%, Ti:0.08～0.15%, P≤0.015%, S≤0.010%, N≤0.0040%, all the other are iron and unavoidable impurities.
Produce the method for tubular rivet, its step with steel:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 6～9 kilograms of/ton steel, and the control molten iron temperature is at 1250～1350 ℃, and the control molten iron contains S weight percent≤0.005% before entering converter;
2) converter smelting, control tapping temperature are at 1650～1680 ℃, and the control basicity of slag is 3.0～4.0, and terminal point C weight percent is 0.03～0.06%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 1～4 kilogram of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.15 ± 0.01%;
4) slag making again in ladle: add quickened lime according to 1～4 kilogram of/ton steel, add fluorite according to 0.1～0.5 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add the aluminum shot deoxidation according to 0.4～0.8 kilogram of/ton steel, add calcium carbide to the top of the slag according to 0.2～0.6 kilogram of/ton steel to the top of the slag;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure≤100Pa in the RH vacuum oven, the weight percent content of oxygen≤0.03% after the decarburization at 20～45 minutes;
7) in the RH vacuum oven, carry out deoxidation, according to 0.5～2 kilogram of/ton disposable adding aluminum shot of steel;
8) in the RH vacuum oven, carry out desulfurization, disposable according to 1～3 kilogram of/ton steel adding CaO, according to 0.2～0.6 kilogram of/ton steel adding fluorite;
9) in the RH vacuum oven, carry out microalloying, according to 1～3 kilogram of/ton disposable Ti-Fe that adds of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.2～0.5 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 20～35 ℃, and the control casting speed is at 1.1～2.0 meters/minute;
13) continuously cast bloom is rolled into square billet, the sectional dimension of continuously cast bloom is greater than square billet;
14) to the square billet heating, control soaking zone temperature is at 1050～1110 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1030～1090 ℃;
16) carry out finish rolling at high line, the control final rolling temperature is at 895～925 ℃;
17) weave silk, laying temperature is controlled at 890～908 ℃;
18) adopt stelmor delayed quench to 630～660 ℃;
19) air cooling is to room temperature, and is stand-by.
The effect of each element and mechanism
C: carbon is the decision tissue of carbon steel after slow cooling and the principal element of performance, carbon to slow cooling after the influence of carbon steel microstructure show as along with carbon content increases, ferrite content reduces, either pearlite occurred increases, the mechanical property of the variable effect steel of organizing in the common steel, it is to exist in the steel as a kind of strengthening element, play the effect of solution strengthening, but carbon is to force worker's hardening element, the cold-forming property that is unfavorable for steel improves, should be low more good more in this steel, according to the purposes characteristics of this steel, the scope of carbon is controlled at≤and 0.006%.
Si: silicon is to add in the killed steel as deoxidant element, and silicon can increase the flowability of molten steel, forms non-metallic inclusion.But silicon is dissolved in the ferrite, improved the tensile strength of steel, every increase 0.1%Si in the carbon steel, tensile strength improves 7.8～8.8MPa, yield-point improves 3.9-4.9MPa, but silicon also is to force worker's hardening element, should be low more good more in this steel, according to the purposes characteristics of this steel, the scope of silicon is controlled at≤and 0.01%.
Mn: manganese has good effect to the mechanical property of carbon steel, and it exists in the steel with solution strengthening, can improve the intensity and the hardness of hot-rolled carbon steel, and the increase of manganese content can improve the relative quantity of steel Medium pearlite.
Manganese also adds in the steel as the element of deoxidation sulphur removal, manganese can improve the deoxidation effect of silicon and aluminium, with sulphur in conjunction with forming manganese sulfide, thereby on sizable degree, eliminate the harmful effect of sulphur in steel, in order to eliminate harmful (hot-short) influence of sulphur in the steel, the scope of manganese elects 0.15%～0.25% as.
Ti: the poker effect that the Ti in the steel can play all even crystal grain thinning and improve wire rod, to improve the cold punching performance and the cold extension performance of steel.Therefore titanium content is controlled at 0.08～0.15%.
P: phosphorus is the detrimental impurity element, derives from steelmaking feeds such as the ore and the pig iron, and phosphorus can improve the intensity of steel, but plasticity, toughness are reduced, and the brittle transition temperature of steel is sharply raise, and promptly improves the cold shortness (low temperature becomes fragile) of steel.Therefore phosphorus content be controlled at≤0.015%.
S: sulphur is harmful element.In the sulfurous gas that ore that it adds when mainly coming from pig iron raw material, steel-making and fuel combustion produce.The maximum harm of sulphur is ftractureed when hot-work, produces hot-short.Sulphur content height in the steel, the content of sulfide inclusion increases, and the plasticity of steel and toughness reduce, sulphur influences steel mechanical property, and is not only relevant with the sulphur content of steel, but also relevant with size, form and the distribution of the sulfide inclusion that forms, therefore, the content of sulphur be controlled at≤0.010%.
N: nitrogen generally is that yield strength and tensile strength improve in steel, and cold-forming property is descended, and nitrogen content is too high, can form bigger titanium nitride and aluminium nitride inclusion, cold punching performance to steel is unfavorable, and the too high solute atoms air mass that also can form nitrogen of nitrogen forms this band of aluminium moral when making the product distortion.Therefore, the content of nitrogen be controlled at≤0.0040%.
Cold stamping of the present invention and anti-cold tearing property are good, and cold extension performance is good, can satisfy user's requirement fully.
Embodiment
The invention will be further described below in conjunction with specific embodiment:
Embodiment 1
The tubular rivet steel, its component and weight percent are: C:0.006%, Si:0.0096%, Mn:0.15%, Ti:0.15%, P:0.015%, S:0.010%, N:0.0040%, all the other are iron and unavoidable impurities.
Produce the method for tubular rivet, its step with steel:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 6 kilograms of/ton steel, and the control molten iron temperature is at 1250～1260 ℃, and control molten iron S weight percent before entering converter is: 0.005%;
2) converter smelting, control tapping temperature are at 1650～1655 ℃, and the control basicity of slag is 3.0, and terminal point C weight percent is 0.06%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 1 kilogram of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.15%;
4) slag making again in ladle: add quickened lime according to 1 kilogram of/ton steel, add fluorite according to 0.1 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add aluminum shot according to 0.4 kilogram of/ton steel to the top of the slag and carry out top of the slag deoxidation, add calcium carbide to the top of the slag according to 0.2 kilogram of/ton steel;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure 5Pa in the RH vacuum oven at 20 minutes, and the weight percent of oxygen is 0.025% after the decarburization;
7) in the RH vacuum oven, carry out deoxidation, according to 0.5 kilogram of/ton disposable adding aluminum shot of steel;
8) in the RH vacuum oven, carry out desulfurization, according to 1 kilogram of/ton disposable adding CaO of steel, according to 0.2 kilogram of/ton disposable adding fluorite of steel;
9) in the RH vacuum oven, carry out microalloying, according to 3 kilograms of/ton disposable Ti-Fe that add of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.2 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 20 ℃, and the control casting speed is at 1.1 meters/minute;
13) with component and weight percent be: C:0.006%, Si:0.0096%, Mn:0.15%, Ti:0.15%, P:0.015%, S:0.010%, N≤0.0040%, all the other are iron and unavoidable impurities, and sectional dimension is that to be rolled into sectional dimension be 200 millimeters * 200 millimeters square billet for 320 millimeters * 420 millimeters continuously cast bloom;
14) to the square billet heating, control soaking zone temperature is at 1050～1060 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1030～1040 ℃;
16) carry out finish rolling at high line, control is gone into final rolling temperature at 895～900 ℃;
17) weave silk, laying temperature is controlled at 890～895 ℃;
18) adopt stelmor delayed quench to 630～635 ℃;
19) air cooling is to room temperature, and is stand-by.
Embodiment 2
The tubular rivet steel, its component and weight percent are: C:0.0051%, Si:0.01%, Mn:0.175%, Ti:0.136%, P:0.013%, S:0.009%, N:0.00380%, all the other are iron and unavoidable impurities.
Produce the method for tubular rivet, its step with steel:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 7.5 kilograms of/ton steel, and the control molten iron temperature is at 1260～1270 ℃, and control molten iron S weight percent before entering converter is: 0.0043%;
2) converter smelting, control tapping temperature are at 1655～1665 ℃, and the control basicity of slag is 3.2, and terminal point C weight percent is 0.052%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 1.7 kilograms of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.16%;
4) slag making again in ladle: add quickened lime according to 1.7 kilograms of/ton steel, add fluorite according to 0.25 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add aluminum shot according to 0.55 kilogram of/ton steel to the top of the slag and carry out top of the slag deoxidation, add calcium carbide to the top of the slag according to 0.35 kilogram of/ton steel;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure 10Pa in the RH vacuum oven at 30 minutes, and the weight percent of oxygen is 0.026% after the decarburization;
7) in the RH vacuum oven, carry out deoxidation, according to 0.9 kilogram of/ton disposable adding aluminum shot of steel;
8) in the RH vacuum oven, carry out desulfurization, according to 1.5 kilograms of/ton disposable adding CaO of steel, according to 0.35 kilogram of/ton disposable adding fluorite of steel;
9) in the RH vacuum oven, carry out microalloying, according to 2.5 kilograms of/ton disposable Ti-Fe that add of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.3 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 25 ℃, and the control casting speed is at 1.5 meters/minute;
13) with component and weight percent be: C:0.0051%, Si:0.01%, Mn:0.175%, Ti:0.136%, P:0.013%, S:0.009%, N≤0.00380%, all the other are iron and unavoidable impurities, and sectional dimension is that to be rolled into sectional dimension be 200 millimeters * 200 millimeters square billet for 320 millimeters * 420 millimeters continuously cast bloom;
14) to the square billet heating, control soaking zone temperature is at 1070～1080 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1050～1060 ℃;
16) carry out finish rolling at high line, control is gone into final rolling temperature at 900～905 ℃;
17) weave silk, laying temperature is controlled at 892～898 ℃;
18) adopt stelmor delayed quench to 635～645 ℃;
19) air cooling is to room temperature, and is stand-by.
Embodiment 3
The tubular rivet steel, its component and weight percent are: C:0.0046%, Si:0.007%, Mn:0.195%, Ti:0.11%, P:0.011%, S:0.008%, N:0.0035%, all the other are iron and unavoidable impurities.
Produce the method for tubular rivet, its step with steel:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 7.8 kilograms of/ton steel, and the control molten iron temperature is at 1290～1300 ℃, and control molten iron S weight percent before entering converter is: 0.0038%;
2) converter smelting, control tapping temperature are at 1660～1670 ℃, and the control basicity of slag is 3.5, and terminal point C weight percent is 0.048%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 2 kilograms of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.16%;
4) slag making again in ladle: add quickened lime according to 2.5 kilograms of/ton steel, add fluorite according to 0.35 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add the aluminum shot deoxidation to the top of the slag, add calcium carbide to the top of the slag according to 0.45 kilogram of/ton steel according to 0.65 kilogram of/ton steel;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure 25Pa in the RH vacuum oven at 35 minutes, and the weight percent of oxygen is 0.027% after the decarburization;
7) in the RH vacuum oven, carry out deoxidation, according to 1.2 kilograms of/ton disposable adding aluminum shots of steel;
8) in the RH vacuum oven, carry out desulfurization, according to 1.8 kilograms of/ton disposable adding CaO of steel, according to 0.4 kilogram of/ton disposable adding fluorite of steel;
9) in the RH vacuum oven, carry out microalloying, according to 2 kilograms of/ton disposable Ti-Fe that add of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.35 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 28 ℃, and the control casting speed is at 1.7 meters/minute;
13) with component and weight percent be: C:0.0046%, Si:0.007%, Mn:0.195%, Ti:0.11%, P:0.011%, S:0.008%, N≤0.0035%, all the other are iron and unavoidable impurities, and sectional dimension is that to be rolled into sectional dimension be 200 millimeters * 200 millimeters square billet for 320 millimeters * 420 millimeters continuously cast bloom;
14) to the square billet heating, control soaking zone temperature is at 1080～1090 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1060～1070 ℃;
16) carry out finish rolling at high line, the control final rolling temperature is at 905～910 ℃;
17) weave silk, laying temperature is controlled at 897～900 ℃;
18) adopt stelmor delayed quench to 640～650 ℃;
19) air cooling is to room temperature, and is stand-by.
Embodiment 4
The tubular rivet steel, its component and weight percent are: C:0.0043%, Si:0.004%, Mn:0.25%, Ti:0.09%, P:0.010%, S:0.007%, N:0.0033%, all the other are iron and unavoidable impurities.
Produce the method for tubular rivet, its step with steel:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 8 kilograms of/ton steel, and the control molten iron temperature is at 1330～1340 ℃, and control molten iron S weight percent before entering converter is: 0.0032%;
2) converter smelting, control tapping temperature are at 1673～1678 ℃, and the control basicity of slag is 3.8, and terminal point C weight percent is 0.040%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 3 kilograms of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.16%;
4) slag making again in ladle: add quickened lime according to 3 kilograms of/ton steel, add fluorite according to 0.4 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add aluminum shot according to 0.7 kilogram of/ton steel to the top of the slag and carry out top of the slag deoxidation, add calcium carbide to the top of the slag according to 0.55 kilogram of/ton steel;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure 95Pa in the RH vacuum oven at 40 minutes, and the weight percent of oxygen is 0.028% after the decarburization;
7) in the RH vacuum oven, carry out deoxidation, according to 1.5 kilograms of/ton disposable adding aluminum shots of steel;
8) in the RH vacuum oven, carry out desulfurization, according to 2.5 kilograms of/ton disposable adding CaO of steel, according to 0.5 kilogram of/ton disposable adding fluorite of steel;
9) in the RH vacuum oven, carry out microalloying, according to 1.5 kilograms of/ton disposable Ti-Fe that add of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.4 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 30 ℃, and the control casting speed is at 1.8 meters/minute;
13) with component and weight percent be: C:0.0043%, Si:0.004%, Mn:0.25%, Ti:0.09%, P:0.010%, S:0.007%, N≤0.0033%, all the other sections for iron and unavoidable impurities are that 320 millimeters * 420 millimeters continuously cast blooms are rolled into 250 millimeters * 500 millimeters square billet;
14) to the square billet heating, control soaking zone temperature is at 1090～1100 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1070～1080 ℃;
16) carry out finish rolling at high line, control is gone into final rolling temperature at 915～920 ℃;
17) weave silk, laying temperature is controlled at 900～905 ℃;
18) adopt stelmor delayed quench to 650～655 ℃;
19) air cooling is to room temperature, and is stand-by.
Embodiment 5
The tubular rivet steel, its component and weight percent are: C:0.0030%, Si:0.005%, Mn:0.20%, Ti:0.08%, P:0.008%, S:0.005%, N:0.0030%, all the other are iron and unavoidable impurities.
Produce the method for tubular rivet, its step with steel:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 9 kilograms of/ton steel, and the control molten iron temperature is at 1340～1350 ℃, and control molten iron S weight percent before entering converter is: 0.002%;
2) converter smelting, control tapping temperature are at 1675～1680 ℃, and the control basicity of slag is 4.0, and terminal point C weight percent is 0.030%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 4 kilograms of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.16%;
4) slag making again in ladle: add quickened lime according to 4 kilograms of/ton steel, add fluorite according to 0.5 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add aluminum shot according to 0.8 kilogram of/ton steel to the top of the slag and carry out top of the slag deoxidation, add calcium carbide to the top of the slag according to 0.6 kilogram of/ton steel;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure 100Pa in the RH vacuum oven at 45 minutes, and the weight percent of oxygen is 0.03% after the decarburization;
7) in the RH vacuum oven, carry out deoxidation, according to 2 kilograms of/ton disposable adding aluminum shots of steel;
8) in the RH vacuum oven, carry out desulfurization, according to 3 kilograms of/ton disposable adding CaO of steel, according to 0.6 kilogram of/ton disposable adding fluorite of steel;
9) in the RH vacuum oven, carry out microalloying, according to 1 kilogram of/ton disposable Ti-Fe that adds of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.5 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 35 ℃, and the control casting speed is at 2.0 meters/minute;
13) with component and weight percent be: C:0.0030%, Si:0.005%, Mn:0.20%, Ti:0.08%, P:0.008%, S:0.005%, N≤0.0030%, all the other sections for iron and unavoidable impurities are that 320 millimeters * 420 millimeters continuously cast blooms are rolled into 200 millimeters * 200 millimeters square billet;
14) to the square billet heating, control soaking zone temperature is at 1100～1110 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1080～1090 ℃;
16) carry out finish rolling at high line, control is gone into final rolling temperature at 915～925 ℃;
17) weave silk, laying temperature is controlled at 903～908 ℃;
18) adopt stelmor delayed quench to 650～660 ℃;
19) air cooling is to room temperature, and is stand-by.
Each embodiment assay situation cartogram of table 1
Claims (2)
1. tubular rivet steel, its component and weight percent are: C≤0.006%, Si≤0.01%, Mn:0.15～0.25%, Ti:0.08～0.15%, P≤0.015%, S≤0.010%, N≤0.0040%, all the other are iron and unavoidable impurities.
2. the described tubular rivet of production claim 1 is with the method for steel, its step:
1) adopt the spray magnesium molten iron desulfuring, spray magnesium amount is carried out according to 6～9 kilograms of/ton steel, and the control molten iron temperature is at 1250～1350 ℃, and the control molten iron contains S weight percent≤0.005% before entering converter;
2) converter smelting, control tapping temperature are at 1650～1680 ℃, and the control basicity of slag is 3.0～4.0, and terminal point C weight percent is 0.03～0.06%;
3) adopt the pushing off the slag tapping, when tap to the molten steel gross weight 1/3 the time, add Mn-Fe according to 1～4 kilogram of/ton steel, when tap to the molten steel gross weight 2/3 the time Mn-Fe all add, and the Mn weight percent in the control molten steel is 0.15 ± 0.01%;
4) slag making again in ladle: add quickened lime according to 1～4 kilogram of/ton steel, add fluorite according to 0.1～0.5 kilogram of/ton steel;
5) according to the omnidistance Argon of routine, and during Argon, add the aluminum shot deoxidation according to 0.4～0.8 kilogram of/ton steel, add calcium carbide to the top of the slag according to 0.2～0.6 kilogram of/ton steel to the top of the slag;
6) carry out refining in the RH vacuum oven, refining time was controlled the vacuum pressure≤100Pa in the RH vacuum oven, the weight percent content of oxygen≤0.03% after the decarburization at 20～45 minutes;
7) in the RH vacuum oven, carry out deoxidation, according to 0.5～2 kilogram of/ton disposable adding aluminum shot of steel;
8) in the RH vacuum oven, carry out desulfurization, disposable according to 1～3 kilogram of/ton steel adding CaO, according to 0.2～0.6 kilogram of/ton steel adding fluorite;
9) in the RH vacuum oven, carry out microalloying, according to 1～3 kilogram of/ton disposable Ti-Fe that adds of steel;
10) in the RH vacuum oven, carry out titanium content and the fine setting of manganese content according to the sampling analysis result;
11) in the RH vacuum oven, carry out calcium and handle, according to 0.2～0.5 kilogram of/ton disposable adding Ca-Fe of steel ball;
12) carry out continuous casting, control continuously cast bloom superheating temperature is at 20～35 ℃, and the control casting speed is at 1.1～2.0 meters/minute;
13) continuously cast bloom is rolled into square billet, the sectional dimension of continuously cast bloom is greater than square billet;
14) to the square billet heating, control soaking zone temperature is at 1050～1110 ℃;
15) carry out roughing at high line, the control start rolling temperature is at 1030～1090 ℃;
16) carry out finish rolling at high line, the control final rolling temperature is at 895～925 ℃;
17) weave silk, laying temperature is controlled at 890～908 ℃;
18) adopt stelmor delayed quench to 630～660 ℃;
19) air cooling is to room temperature, and is stand-by.
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| CN101956131A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of ultra-low carbon steel and ultra-low carbon steel plate |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101956131A (en) * | 2009-07-16 | 2011-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of ultra-low carbon steel and ultra-low carbon steel plate |
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