CN101967610A - High carbon high silicon martensite stainless steel billet and preparation method thereof - Google Patents
High carbon high silicon martensite stainless steel billet and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high carbon high silicon martensite stainless steel billet. The steel billet is characterized by comprising the following components by weight percent: 0.41-0.47% of C, 2.80-3.20% of Si, 0.50-0.80% of Mn, 8.50-9.20% of Cr, 0.30% or less of Ni, 0.028% or less of P, 0.005% or less of S, 0.20% or less of W, 0.20% or less of Mo, 0.15% or less of V, 0.015% or less of Nb, 0.015% or less of Ti, 0.010% or less of Al and the balance Fe and inevitable impurities. The invention also provides a preparation method of the high carbon high silicon martensite stainless steel billet. The method comprises the following steps: performing primary smelting with an electric arc furnace (EAF), performing argon-oxygen decarburization (AOD) smelting, refining with a low frequency (LF) furnace, performing continuous casting, annealing and rolling. The method of the invention has simple operation, can stably control the quality of the continuous casting billet, completely suppresse cracks, overcome the defect of concentration of stress and increase the casting yield and quality stability of the martensite stainless steel.
Description
Technical field
The present invention relates to stainless smelting of metallurgy industry and casting process, specifically, the present invention relates to the smelting and the continuous small-billet casting method of the high silicon Martensite Stainless Steel of high-carbon.
Background technology
Continuously cast bloom can be divided into slab, bloom, little square billet, circle base, special-shaped base etc. by section, and its medium and small square billet (refers to cross dimensions≤180 * 180mm
2Continuously cast bloom) strand produced of continuous casting, main for being rolled into kinds such as bar, wire rod, shaped steel, band steel, tubing.Stainless steel is common high quality steel, from metallographic structure, generally can be divided into austenitic stainless steel, ferritic stainless steel, Martensite Stainless Steel and duplex stainless steel.
4Cr9Si Series Steel kind high carbon martensite stainless steel contains elements such as chromium, silicon, has hot strength and high temperature oxidation resistance preferably, and hardenability is higher, is fit to do the inlet valve of light duty engine or the valve rod of blast gate (gas valve steel).The air valve steel is an important branch of high temperature steel, is used to make all kinds of Diesel Engine's Air Valve, is the special-purpose exotic materials of making oil engine inlet and outlet door.The working conditions of air valve steel is extremely abominable, the corrosion that under the explosion pressure of 400～900 ℃ of high temperature, 3447.5～6895.0kPa, bear high temperature combustion gas such as gasoline, diesel oil for a long time with wash away, stand frequent high-speed motion and friction repeatedly and impact, load is big.This requires valve material that good heat resistance is arranged, thermohardening, and fatigue strength, wear resistance and anti-oxidant, erosion resistance, and require the linear expansivity of air valve steel little or the like.Therefore except requiring to use the special-purpose exotic materials, also require the steel clarity higher, surface quality is good.Since during using, generally need stand the air valve steel test of high temperature, repeated stock, very high to the requirement of material property.Basically all adopt die casting production when therefore, manufacturer both domestic and external produces similar steel grade.
The production technique of existing domestic analogous products mainly contains: Medium frequency induction+esr+steel rolling and electric furnace die casting+breaking down (forging) cogging+steel rolling.These technical process are long, the production cost height, and some can only be confined to small serial production, is difficult to mass-producing.The rolling technology of its wire rod is ripe relatively and stable, but also can find indivedual overlength oxide inclusion or oarse-grained point-like inclusion once in a while, therefore need improve the molten steel purity in smelting, and while control in solidifying improves the distribution of inclusion.Consider that die casting process also needs operations such as breaking down cogging, long flow path, therefore the production cost height is developed continuous small-billet casting and is directly had very important significance for rod rolling.
But, the continuous small-billet casting of martensitic steel generally only limits to 1Cr13,2Cr13 at present, and along with the rising of carbon content, the difficulty of control is just very high when [C]＞0.20%, be mainly reflected in continuously cast bloom easily shape give birth to crackle, be easy to generate center segregation and defective such as loose.Continuous small-billet casting is that the loss of the ladle or the temperature drop of tundish is all bigger because section is little, and pulling rate is very fast, and the pouring time of every stove steel is longer, the difficult stable control of the quality of whole production and continuously cast bloom.And hot coefficient of the high temperature of Martensite Stainless Steel and plain carbon stool are completely different, and heat conduction is slow, the linear shrinkage amount forms thermal stresses greatly, easily and concentrates and crack.
Reduce crackle hidden danger, alleviate center porosity, segregation, only find, and the safety range of this speed of cooling is very narrow, is very easy to out industrial accident and quality accident at the rational speed of cooling of this steel grade.At present, at general high carbon steel, alleviate center porosity, segregation, adopt the method for " low temperature is cast fast " mostly, but for martensitic steel, such solution is bad as controlling, and pulling rate is fast, tends to cause produce fluctuation greatly, be easy to crack, therefore, stable control is difficult to, and effect is not often not clearly.
Concerning martensitic little square billet, also to solve the problem that the cooling stress in the continuously cast bloom rapid solidification is concentrated, the on-the-spot general method that adopts red base slow cooling (24 hours or more than), but for medium high carbon martensite, it also has the problem of a season stress, if grown storage period after the continuously cast bloom production slow cooling, remove heating rolling again, also be easy to generate crackle.
Because above factors, the similar production report of martensite air valve steel 4Cr9Si steel series continuous small-billet casting is few, also can't find similar production patented technology.Therefore, develop the mode of production of the high silicon Martensite Stainless Steel of a kind of high-carbon continuous small-billet casting,, improve product competitiveness, have great importance for reducing cost.
The objective of the invention is to develop a kind of high-carbon little square billet of high silicon Martensite Stainless Steel and manufacture method thereof, mode with " electric arc furnace fusing molten steel+AOD stove smelting+continuous small-billet casting ", by comprehensive adjustment to the control of steel grade composition, casting process parameter, produce and contain the little square billet of high-quality Martensite Stainless Steel for wire production, to replace die casting, enhance productivity, reduce cost, satisfy the customer requirements and the market requirement.
Summary of the invention
First aspect of the present invention provides the high silicon Martensite Stainless Steel of a kind of high-carbon little square billet, contain following composition: C:0.41～0.47%, Si:2.80～3.20%, Mn:0.50～0.80%, Cr:8.50～9.20%, Ni by weight percentage: P≤0.30%: S≤0.028% :≤0.005%, W: Mo≤0.20%: V≤0.20%: Nb≤0.15%: Ti≤0.015%: Al≤0.015% :≤0.010%, all the other are Fe and unavoidable impurities.
Second aspect of the present invention provides the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of above-mentioned high-carbon, comprising: EAF just refines, AOD melting, the refining of LF stove, continuous casting, annealing and rolling process.
The manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon according to the present invention preferably, is just refined in the operation at described EAF, presses the stainless steel Returning blowing keto technique in ac arc furnace, and raw material is melted refining just; Slag free tapping, tapping temperature 〉=1630 ℃.
The manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon according to the present invention, preferably, in described AOD melting operation,
Omnidistance Argon;
Add lime according to [Si] content in the molten steel, lime adding amount=(3.2～4.0) * G * [Si] (G is a steel-making molten steel in the stove weight);
Ar, O mix and to add alloy when blowing to T 〉=1660 ℃;
To [C]≤0.35%, stop oxygen blast, the Argon reduction;
The prereduction time is 5～10min, changes slag operation according to terminal point [S] content, reduction, tapping control [S] content＜0.005%.
The manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon according to the present invention, preferably, in described continuous casting working procedure,
The bull ladle temperature is: 1520～1525 ℃ of continuous casting first bags, 1515～1520 ℃ of the attendants of a stage actor;
Superheating temperature is 25 ℃～35 ℃;
Tundish adopts magnesia tundish, open water before baking require: shell 〉=100 ℃, hold-time 〉=30min;
Unwrap greatly and water, tundish weight 〉=4 ton hours is added the insulation of special stainless steel insulating covering agent and MgO matter tundish covering flux;
Tundish weight 〉=6 ton hours, thermometric, the centre is unwrapped and is watered;
Add the special crystallizer covering slag, performance requriements: basicity 0.85～0.95,1090～1110 ℃ of fusing points, viscosity 1.6～2.8dpa.S;
The mold oscillation mode is selected for use: amplitude 6mm, frequency=(140～the 150) * V that shakes (wherein V is a pulling rate, 0.6～1.8m/min) inferior/minute, adopting the non-sinusoidal oscillation curve, the mathematics correlated expression formula of waveform correlation D (t) position is:
Vibration rising cycle: D (t)=3*Sin (143* π * f art t)
Vibration decline cycle: D (t)=3*Sin (pi/2+333* π * f* (t-T))
In the formula, f is the frequency of vibration, 1/min; T is constantly, s; T changes the moment that descends, s for rising.
More excellent is, in described continuous casting working procedure,
Superheating temperature≤30 ℃;
Pulling rate is 1.1～1.6m/min;
Two cold specific waters are 0.28～0.32 liter of/kilogram steel, and the mass area ratio of three water-cool control subregions of two cool regions (sufficient roller one district, mobile Duan Er district, canned paragraph three districts) is 35%: 38%: 27%.
The manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon according to the present invention, preferably, in described annealing operation, annealing curve is: hot base is heated to 700 ℃, cools to 600 ℃ with the furnace, and the air cooling of coming out of the stove after being cooled to 400 ℃ again cracks.
According to the inventive method, at first in electric arc furnace, press the stainless steel Returning blowing keto technique, starting material such as returns, alloy, auxiliary material are melted refining just; Carry out the melting of stainless steel molten steel then at the AOD stove, smelt the high silicon Martensite Stainless Steel of the qualified high-carbon of composition molten steel; Carry out the production of continuous casting at last, be cast into qualified little square billet, for being rolled into wire rod.Concrete technology is as follows:
EAF: when smelting required starting material such as returns, alloy and auxiliary material batching, starting material carbon content unrestricted (because of AOD has good decarburization effect) is used high carbon alloy as far as possible, reduces smelting cost (low C Chrome metal powder cost is much higher than high C Chrome metal powder); Fusing refining just is by general stainless steel Returning blowing keto technique operation; Draw slag whole before the tapping, guarantee slag free tapping; Tapping temperature: T 〉=1630 ℃.
AOD: omnidistance Argon; Add lime according to [Si] content in the molten steel, lime adding amount=(3.2～4.0) * G * [Si] (G is a steel-making molten steel in the stove weight); Ar, O mix and to add alloy when blowing to T 〉=1660 ℃; To [C]≤0.35%, stop oxygen blast, the Argon reduction; Prereduction time 5～10min changes slag operation according to terminal point [S] content, reduction, tapping control [S] content＜0.005%.Smelt the qualified Martensite Stainless Steel molten steel of composition and purity in the AOD stove, the weight percent composition of its molten steel is: C:0.41～0.47%; Si:2.80～3.20%; Mn:0.50～0.80%; Cr:8.50～9.20%; Ni :≤0.30%; P :≤0.028%; S :≤0.005%; All the other are Fe and impurity element.For guaranteeing the molten steel purity, control requires as follows to residual element especially:
The bull ladle temperature is: 1520～1525 ℃ of continuous casting first bags, 1515～1520 ℃ of the attendants of a stage actor.
Key of the present invention is the control of composition and residual element and the stable control in the casting process.Continuous casting production needs molten steel that purity and flowability are preferably arranged, and to effectively improve the continuously cast bloom center mass, it is necessary reducing superheating temperature, but pulling rate should be controlled, but low temperature " knot plug " for fear of continuous casting, molten steel flow is again crucial, improve molten steel flow, just must improve the molten steel purity.
CCM: adopt integrated approachs such as improving molten steel purity (control residual element and gas, inclusion), the low pulling rate controlled chilling speed of low temperature, red base annealing, effectively realize the continuous casting production of this steel grade.
25 ℃～35 ℃ of superheating temperature controls are striven≤30 ℃.Tundish adopts magnesia tundish, open water before baking require: shell 〉=100 ℃, hold-time 〉=30min.Unwrap greatly and water, tundish weight 〉=4 ton hours is added the insulation of special stainless steel insulating covering agent and MgO matter tundish covering flux.Tundish weight 〉=6 ton hours, thermometric, the centre is unwrapped and is watered.Add the special crystallizer covering slag, performance requriements: basicity 0.85～0.95,1090～1110 ℃ of fusing points, viscosity 1.6～2.8dpa.S.
The reasonable disposition of the pouring temperature link that is absolutely necessary, it involves the control of initial solidification quality.The design of special crystallizer covering slag has guaranteed the surface quality and the casting stability of little square billet, reduces bleed-out.
Also depend on vibration mode because covering slag flows into, the mold oscillation mode is selected for use among the present invention: amplitude 6mm, and (wherein V is a pulling rate to frequency=(140～the 150) * V that shakes, m/min; Pulling rate useful range in the formula: 0.6～1.8m/min) inferior/minute; Adopt the non-sinusoidal oscillation curve, the mathematics correlated expression formula of waveform correlation D (t) position is:
Vibration rising cycle: D (t)=3*Sin (143* π * f*t)
Vibration decline cycle: D (t)=3*Sin (pi/2+333* π * f* (t-T))
In the formula, f is the frequency of vibration, 1/min; T is constantly, s; T changes the moment that descends, s for rising.
Vibration control is a gordian technique in the inventive method, because the initial base shell of high carbon martensite is inhomogeneous easily, is easy to generate stress concentration, and it is again the responsive steel grade of crackle, therefore to covering slag select for use, vibration control, pulling rate etc. all have strict demand.
Pulling rate control: corresponding pulling rate 1.1m/min～1.6m/min; This is a kind of at Martensite Stainless Steel and the general different control key of austenitic stainless steel, can effectively guarantee the measure of continuous casting billet quality necessary technology.Its pulling rate control principle: the superheating temperature that this steel grade is same, should be slower 10%～20% under the high pulling rate than austenitic stainless steel, under this pulling rate controlling valu, could guarantee the solidified structure performance.
Under the prerequisite of the method for bag temperature fluctuation, the present invention adopts " low temperature, low pulling rate " control method, has optimized every processing parameter, adopts weak cold system, evenly controlled chilling speed on the decrease.The control pulling rate can guarantee the solidified structure performance.
Cooling intensity: owing to adopted the casting pattern of the low pulling rate of low temperature, the present invention selects the type of cooling of " weak cold " for use, and two cold specific waters choose 0.28～0.32 liter of/kilogram steel, and so neither easy bleed-out also can alleviate the phenomenon that the generation thermal stresses is concentrated; Easily produce the characteristic of transformation stress at the martensite low temperature phase change, when continuous casting, special three water-cool control subregions (sufficient roller one district at two cool regions, mobile Duan Er district, canned paragraph three districts) optimize and revise on the mass area ratio, the ratio of originally common 304 austenitic stainless steels, three district's water yields is 30%: 40%: 30%, after taking into full account the steel grade characteristic now, by the test comparison, finally drawing the optimization proportioning is 35%: 38%: 27%, so relatively meet the hot rerum natura condition of the high temperature as cast condition of Martensite Stainless Steel, finally can access inner preferably as-cast structure.
The coagulating property of the high silicon martensite of high-carbon steel grade, its plasticity under the condition of high temperature is similar with austenite, and temperature low after just relatively be easy to generate crackle, therefore, different cooling ratios is adopted in the different zones of solidifying, and can effectively guarantee continuous casting billet quality.
Hot annealing: continuously cast bloom enters burial pit at once behind the collection base.Simultaneously burial pit is transformed, in the hole, increased electrically heated device, can be used as special-purpose hot base annealing furnace.After the strand of red heat gets off from line, be transported to hot base annealing furnace at once.Simultaneously through overtesting, make the steel grade annealing curve after the optimization: the instant heating base is heated to 700 ℃, cools to 600 ℃ with the furnace, and the air cooling of coming out of the stove after being cooled to 400 ℃ again cracks.Can solve such steel grade like this and be easy to generate the problem that cooling stress is concentrated, improve the quality of continuously cast bloom.Red base is carried out annealing process after the ejection, has guaranteed slab quality effectively.
Beneficial effect of the present invention is:
1, production operation is simple;
2, can stablize the quality of control continuously cast bloom, satisfy the confession base requirement of the high silicon Martensite Stainless Steel of high-carbon material;
3, thoroughly suppress the ubiquitous defective that is prone to crackle and stress concentration in the casting of high carbon martensite stainless steel;
4, the recovery rate and the quality of stability of Martensite Stainless Steel casting have been improved greatly.
Embodiment
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Produce the Martensite Stainless Steel of the 1 stove BT45Cr9Si3 trade mark, its technical process is as follows:
60 tons of ac arc furnace fusing-→ 60 tons of AOD meltings-→ 60 of refining just ton LF refining furnaces are adjusted the casting of-→ three machines three streams 160 * 160mm section billet caster.
The first step, the melting of stainless steel molten steel is carried out in electric arc furnace fusing refining just at the AOD stove.Tapping LF adjusts, lifting composition: C:0.42%; Si:2.95%; Mn:0.72%; Cr:8.9%; P:0.018%; S:0.005%; Lifting temperature: 1525 ℃.
Second step, 1135 ℃ of tundish baking inner wall temperatures.Access default operation code parameter.Unwrap greatly and water, tundish weight 4 ton hours add the insulation of special stainless steel insulating covering agent and MgO matter tundish covering flux.Tundish weight 6.5 ton hours, 1495 ℃ of thermometrics, the centre is unwrapped and is watered.Open to water and adopt automatic casting control, normal casting pattern is gone in three circulations after 2 minutes.
The 3rd step, normal casting,
(1) opens and water pulling rate 1.2m/min, vibrate corresponding automatic coupling.Add the special crystallizer covering slag, add-on 0.4～0.5kg/ ton steel;
(2) take off ingot after, according to tundish thermometric temperature control pulling rate, 1488 ℃ of tundish thermometrics, pulling rate 1.2m/min, two cold specific water 0.29L/kg;
(3) big bag waters completely, and tundish begins tail base Optimizing operation less than 10 ton hours, the useless base quantity of control rationally;
(4) the direct handling of red heat base is to the slow cooling annealing pit, and hot base is heated to 700 ℃, cools to 600 ℃ with the furnace, and the air cooling of coming out of the stove after being cooled to 400 ℃ again cracks.
Embodiment 2
Produce the Martensite Stainless Steel of the 1 stove BT45Cr9Si3 trade mark, its technical process is as follows:
60 tons of ac arc furnace fusing-→ 60 tons of AOD meltings-→ 60 of refining just ton LF refining furnaces are adjusted the casting of-→ three machines three streams 160 * 160mm section billet caster.
The first step, the melting of stainless steel molten steel is carried out in electric arc furnace fusing refining just at the AOD stove.Tapping LF adjusts, lifting composition: C:0.46%; Si:3.10%; Mn:0.72%; Cr:9.0%; P:0.016%; S:0.003%; Lifting temperature: 1520 ℃.
Second step, 1090 ℃ of tundish baking inner wall temperatures.Access default operation code parameter.Unwrap greatly and water, tundish weight 4.5 ton hours add the insulation of special stainless steel insulating covering agent and MgO matter tundish covering flux.Tundish weight 6.2 ton hours, 1488 ℃ of thermometrics, the centre is unwrapped and is watered.Open to water and adopt automatic casting control, normal casting pattern is gone in three circulations after 2 minutes.
The 3rd step, normal casting,
(1) opens and water pulling rate 1.2m/min, vibrate corresponding automatic coupling.Add the special crystallizer covering slag, add-on 0.4～0.5kg/ ton steel;
(2) take off ingot after, according to tundish thermometric temperature control pulling rate, 1478 ℃ of tundish thermometrics, pulling rate 1.5m/min, two cold specific water 0.31L/kg;
(3) big bag waters completely, and tundish begins tail base Optimizing operation less than 10 ton hours, the useless base quantity of control rationally;
(4) the direct handling of red heat base is to the slow cooling annealing pit, and hot base is heated to 700 ℃, cools to 600 ℃ with the furnace,
The air cooling of coming out of the stove after being cooled to 400 ℃ again cracks.
This stove steel finally is rolled into wire rod, and its performance index are as follows:
Wire rod annealing hardness: 255HBW, 260HBW
Wire rod heat treatment hardness: 306HBW, 313HBW
Wire rod sample thermal treatment back draft performance is as shown in table 1, and non-metallic inclusion content is as shown in table 2.
Table 1 wire rod sample thermal treatment back draft performance
| Rm(Mpa) | Rp0.2(Mpa) | A(％) | Z(％) |
| 975 | 800 | 25.0 | 52.0 |
| 975 | 795 | 24.5 | 55.0 |
Table 2 non-metallic inclusion content (level)
| At | Af | Bt | Bf | Ct | Cf | Dt | Df | Ds |
| 0.5 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.5 | 0.0 | 0 |
| 0.5 | 0.0 | 0.5 | 0.0 | 0.0 | 0.0 | 0.5 | 0.0 | 0 |
From wire rod sample product performance, reached the specification of quality of air valve product made from steel fully.
The inventive method operating procedure is simple, the casting steady quality, process control is reliable and stable, artificial interference is few, improved molten steel recovery rate and quality stability greatly.Implement the high silicon martensite of the high-carbon air valve steel that the inventive method is produced, its chemical ingredients satisfies internally controlling requirement fully, molten steel metallurgical quality height, and the continuously cast bloom of producing is for mill product, and performance meets user's quality standard requirement fully.
Claims (7)
1. little square billet of the high silicon Martensite Stainless Steel of high-carbon, it is characterized in that, contain following composition: C:0.41～0.47%, Si:2.80～3.20%, Mn:0.50～0.80%, Cr:8.50～9.20%, Ni by weight percentage: P≤0.30%: S≤0.028% :≤0.005%, W: Mo≤0.20%: V≤0.20%: Nb≤0.15%: Ti≤0.015%: Al≤0.015% :≤0.010%, all the other are Fe and unavoidable impurities.
2. the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon, it is characterized in that, the little square billet of the high silicon Martensite Stainless Steel of described high-carbon contains following composition: C:0.41～0.47% by weight percentage, Si:2.80～3.20%, Mn:0.50～0.80%, Cr:8.50～9.20%, Ni :≤0.30%, P :≤0.028%, S :≤0.005%, W :≤0.20%, Mo :≤0.20%, V :≤0.15%, Nb :≤0.015%, Ti :≤0.015%, Al :≤0.010%, all the other are Fe and unavoidable impurities, and the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of described high-carbon comprises: EAF just refines, the AOD melting, the refining of LF stove, continuous casting, annealing and rolling process.
3. the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon as claimed in claim 2 is characterized in that, just refines in the operation at described EAF, presses the stainless steel Returning blowing keto technique in ac arc furnace, and raw material is melted refining just; Slag free tapping, tapping temperature 〉=1630 ℃.
4. the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon as claimed in claim 2 is characterized in that, in described AOD melting operation,
Omnidistance Argon;
Add lime according to [Si] content in the molten steel, lime adding amount=(3.2～4.0) * G * [Si], G are steel-making molten steel in the stove weight;
Ar, 0 mixes and to add alloy when blowing to T 〉=1660 ℃;
To [C]≤0.35%, stop oxygen blast, the Argon reduction;
The prereduction time is 5～10min, changes slag operation according to terminal point [S] content, reduction, tapping control [S] content＜0.005%.
5. the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon as claimed in claim 2 is characterized in that, in described continuous casting working procedure,
The bull ladle temperature is: 1520～1525 ℃ of continuous casting first bags, 1515～1520 ℃ of the attendants of a stage actor;
Superheating temperature is 25 ℃～35 ℃;
Tundish adopts magnesia tundish, open water before baking require: shell 〉=100 ℃, hold-time 〉=30min;
Unwrap greatly and water, tundish weight 〉=4 ton hours is added the insulation of special stainless steel insulating covering agent and MgO matter tundish covering flux;
Tundish weight 〉=6 ton hours, thermometric, the centre is unwrapped and is watered;
Add the special crystallizer covering slag, performance requriements: basicity 0.85～0.95,1090～1110 ℃ of fusing points, viscosity 1.6～2.8dpa.S;
The mold oscillation mode is selected for use: amplitude 6mm, frequency=(140～the 150) * V that shakes (wherein V is a pulling rate, 0.6～1.8m/min) inferior/minute, adopting the non-sinusoidal oscillation curve, the mathematics correlated expression formula of waveform correlation D (t) position is:
Vibration rising cycle: D (t)=3*Sin (143* π * f*t)
Vibration decline cycle: D (t)=3*Sin (pi/2+333* π * f* (t-T))
In the formula, f is the frequency of vibration, 1/min; T is constantly, s; T changes the moment that descends, s for rising.
6. the manufacture method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon as claimed in claim 5 is characterized in that, in described continuous casting working procedure,
Superheating temperature≤30 ℃;
Pulling rate is 1.1～1.6m/min;
Two cold specific waters are 0.28～0.32 liter of/kilogram steel, three water-cool control subregions of two cool regions: the mass area ratio in sufficient roller one district, mobile Duan Er district, canned paragraph three districts is 35%: 38%: 27%.
7. the production method of the little square billet of the high silicon Martensite Stainless Steel of high-carbon as claimed in claim 2 is characterized in that in described annealing operation, annealing curve is: hot base is heated to 700 ℃, cools to 600 ℃ with the furnace, and the air cooling of coming out of the stove after being cooled to 400 ℃ again cracks.
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| CN2009100554707A CN101967610B (en) | 2009-07-28 | 2009-07-28 | High carbon high silicon martensite stainless steel billet and preparation method thereof |
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