CN104018070A - Flaw detection guaranteed thick S355J2 borated steel plate and production method thereof - Google Patents
Flaw detection guaranteed thick S355J2 borated steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a flaw detection guaranteed thick S355J2 borated steel plate and a production method thereof. The flaw detection guaranteed thick S355J2 borated steel plate comprises the following chemical components by weight percent: 0.17-0.19% of C, 0.35-0.45% of Si, 1.45-1.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.025-0.035% of V, 0.0015-0.003% of Ca, 0.017-0.03% of Als, and the balance of iron and impurities. The invention also discloses a production method of the flaw detection guaranteed thick S355J2 borated steel plate. The flaw detection guaranteed thick S355J2 borated steel plate is made of low cost components, is added with trace V based on the conventional C-Mn steel, is prepared through proper heating, controlled rolling, controlled cooling and normalizing, and has good surface quality.
Description
Technical field
This counterweight relates to a kind of material technology, specifically, relates to a kind of thick specification guarantor flaw detection S355J2 and adds boron plate and production method thereof.
Background technology
S355J2 steel grade requires to have higher intensity and toughness, and this steel grade is widely used in the every field in the manufacturing, along with manufacturing development, more and more thicker to the thickness requirement of S355J2 steel plate, and steel plate also needs flaw detection to meet the demands simultaneously.Along with steel plate thickness thickens, when rolling, compression ratio reduces, and the flaw detection qualification rate of Plate Steel generally can decline.S355J2 steel plate adopts Europe superscript to produce, and the steel plate of production is used for outlet, and outlet steel plate generally all will in steel plate, add boron or in surperficial mopping, surperficial mopping meeting causes complex process, and cost is high; Easily occur crackle and add boron steel, thick steel plates, because compression ratio is little, occurs that the possibility of crackle is larger.Therefore the guarantor of thick specification detect a flaw S355J2 add boron steel be difficult to produce in enormous quantities.
China publication number CN101654760A discloses a kind of unalloyed structural steel S 355 J 2 steel plate and production method thereof.Armor plate strength and the toughness of producing by the method all meet standard-required.But the method is not suitable for the Plate Production of the above thickness specification of 80mm, and not boracic (B) of composition.
China publication number CN102345060A discloses and has a kind ofly added boron plate and production method thereof without surface crack S355J2.Armor plate strength and the toughness of producing by the method all meet standard-required, and surface of steel plate flawless, can protect three grades of flaw detections.But the method requires to roll steel plate enters burial pit stacking slow cooling, high to subsequent technique condition and equipment requirements, do not discuss meeting three grades of above flaw detections, in steel, added Nb, Ti simultaneously, cost of alloy is high.
Summary of the invention
Technical problem solved by the invention is to provide a kind of thick specification and protects flaw detection S355J2 and add boron plate, and the intensity of steel plate, plasticity, toughness are good.
Technical scheme is as follows:
A kind of thick specification is protected flaw detection S355J2 and is added boron plate, its chemical composition by weight percentage, comprise: C0.17～0.19%, Si0.35～0.45%, Mn1.45～1.6%, P≤0.02%, S≤0.005%, V0.025～0.035%, Ca0.0015～0.003%, Als0.017～0.03%, all the other are iron and impurity.
Further, its chemical composition by weight percentage, comprising: C0.17%, Si0.0.35%, Mn1.45%, P0.02%, S0.003%, V0.025%, Als0.017%, Ca0.0015%, all the other are iron and impurity.
Further, its chemical composition by weight percentage, comprising: C0.19%, Si0.0.45%, Mn1.55%, P0.012%, S0.005%, V0.035%, Als0.026%, Ca0.002%, all the other are iron and impurity.
Further, its chemical composition by weight percentage, comprising: C0.18%, Si0.45%, Mn1.6%, P0.007%, S0.002%, V0.029%, Als0.03%, Ca0.003%, all the other are iron and impurity.
Another technical problem solved by the invention is to provide a kind of thick specification and protects the production method that flaw detection S355J2 adds boron plate, and, normalizing process cold by suitable heating, controlled rolling, control just obtained the good thick specification of surface quality and protected flaw detection S355J2 and add boron plate.
Thick specification is protected the production method that flaw detection S355J2 adds boron plate, comprises that smelting, continuous casting, slab reheat, steel plate rolling moulding, laminar flow are cooling, the step of stacking slow cooling and normalizing treatment, wherein,
In casting process, use induction stirring and light pressure, the frequency of induction stirring is 6Hz, and electric current is 300A, and light draught of pressing is 2.0mm;
Slab reheats in process, adopts the thick continuously cast bloom of 250mm to produce, the tapping temperature 1180-1210 DEG C reheating, 270～410 minutes heat-up times;
In steel plate rolling moulding process, first stage open rolling thickness is slab thickness, 1170～1200 DEG C of first stage start rolling temperatures, single pass draft >=10% when first stage high temperature extends rolling, 3～5 passages of rolling; The open rolling thickness of subordinate phase steel plate is 1.3～2 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 860～890 DEG C, and subordinate phase finishing temperature is 820～850 DEG C, and 4～6 passages of rolling, have a time draft >=11% at least;
In laminar cooling process, speed of cooling is 5～8 DEG C/s, and final cooling temperature is 640～690 DEG C; In stacking slow cooling process, require the stacking slow cooling temperature of steel plate to be greater than 200 DEG C;
In normalizing treatment process, the temperature of normalizing is 870 DEG C, and 870 DEG C of insulations 20 minutes.Normalizing adopts natural air cooling mode cooling after coming out of the stove;
The thickness that the thick specification guarantor of finished product flaw detection S355J2 adds boron plate is 50mm～100mm, its chemical composition by weight percentage, comprise: C0.17～0.19%, Si0.35～0.45%, Mn1.45～1.6%, P≤0.02%, S≤0.005%, V0.025～0.035%, Ca0.0015～0.003%, Als0.017～0.03%, all the other are iron and impurity.
Further: slab tapping temperature is 1180 DEG C, the heating of plate blank time is 270 minutes, 1170 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 12% of rolling, subordinate phase open rolling thickness 108mm, 880 DEG C of subordinate phase start rolling temperatures, 850 DEG C of subordinate phase finishing temperatures, 6 DEG C/s of speed of cooling, 640 DEG C of final cooling temperatures, 870 DEG C of normalizing temperatures; Finished steel plate thickness is 60mm, and its chemical composition by weight percentage, comprising: C0.17%, Si0.0.35%, Mn1.45%, P0.02%, S0.003%, V0.025%, Als0.017%, Ca0.0015%, surplus is Fe and impurity.
Further: slab tapping temperature is 1210 DEG C, the heating of plate blank time is 410 minutes, 1200 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 10% of rolling, subordinate phase open rolling thickness 130mm, 860 DEG C of subordinate phase start rolling temperatures, 832 DEG C of subordinate phase finishing temperatures, 5 DEG C/s of speed of cooling, 658 DEG C of final cooling temperatures, 870 DEG C of normalizing temperatures; Finished steel plate thickness is 100mm, and its chemical composition by weight percentage, comprising: C0.19%, Si0.0.45%, Mn1.55%, P0.012%, S0.005%, V0.035%, Als0.026%, Ca0.002%, surplus is Fe and impurity.
Further: slab tapping temperature is 1202 DEG C, the heating of plate blank time is 373 minutes, 1192 DEG C of first stage start rolling temperatures, first stage high temperature extends the minimum single pass draft 14% of rolling, subordinate phase open rolling thickness 100mm, 890 DEG C of subordinate phase start rolling temperatures, 810 DEG C of subordinate phase finishing temperatures, 8 DEG C/s of speed of cooling, 690 DEG C of final cooling temperatures, 870 DEG C of normalizing temperatures; Finished steel plate thickness is 50mm, and its chemical composition by weight percentage, comprising: C0.18%, Si0.45%, Mn1.6%, P0.007%, S0.002%, V0.029%, Als0.03%, Ca0.003%, surplus is Fe and impurity.
Further: in smelting and casting process, molten iron adopts the desulfurization of magnesium base, adopts top bottom blowing in converter; Molten steel, through the refining of LF stove, requires S≤0.003% in molten steel; Molten steel carries out the processing of RH stove, is no more than the treatment time under 133Pa is not less than 30 minutes in vacuum tightness; The thickness of continuously cast bloom is 250mm, adopts induction stirring and gently depress when continuous casting, and induction stirring frequency is 6Hz, electric current 280A, and depressing position is 6,7,8 sections, draught is 2mm, 2mm, 2mm.
Compared with prior art, this counterweight technique effect comprises:
1, the present invention adopts low cost Composition Design, only on the basis of traditional C-Mn steel, adds micro-V, and, normalizing process cold by suitable heating, controlled rolling, control just obtained the good thick specification of surface quality and protected flaw detection S355J2 and add boron plate.
2, the intensity of steel plate, plasticity, toughness are good.The intensity of steel plate is between 360MPa～430MPa, and tensile strength is between 540～600MPa, and unit elongation is between 24%～32%, and-20 DEG C of ballistic works are between 140J～200J.
3, the flaw detection qualification rate of steel plate is high.The one-level flaw detection qualification rate of steel plate reaches 99.96%.
4, the composition of steel plate and technological design are reasonable, and process system is looser, can be on generous printed line stably manufactured.
5, produce this S355J2 of 50mm～100mm with 1 year and add 1.5 ten thousand tons of boron plates, 200 yuan of calculating of profit per ton.Within 1 year, can increase by 3,000,000 yuan of profits, there is good economic benefit.This plate surface quality is good, without operation reconditioning below, is convenient to processing, has good social benefit.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of the steel plate of the embodiment of the present invention 1;
Fig. 2 is the metallographic structure figure of the steel plate of the embodiment of the present invention 2;
Fig. 3 is the metallographic structure figure of the steel plate of the embodiment of the present invention 3.
Embodiment
Only on the basis of traditional C-Mn steel, add micro-V,, normalizing process cold by suitable heating, controlled rolling, control just obtained the good thick specification of surface quality and protected flaw detection S355J2 and add boron plate.The S355J2 that has solved common process production adds the serious problem of boron plate surface crack.
Thick specification is protected the production method that flaw detection S355J2 adds boron plate, and concrete steps are as follows:
Step 1: smelt and continuous casting;
(1) molten iron adopts the desulfurization of magnesium base, adopts top bottom blowing in converter;
(2) molten steel, through the refining of LF stove, requires S≤0.003% in molten steel;
(3) molten steel carries out the processing of RH stove, is no more than the treatment time under 133Pa is not less than 30 minutes in vacuum tightness.
(4) thickness of continuously cast bloom is 250mm, adopts induction stirring and gently depress when continuous casting, and induction stirring frequency is 6Hz, electric current 280A, and depressing position is 6,7,8 sections, draught is 2mm, 2mm, 2mm.When continuous casting, adopting induction stirring and gently depressing is the proportion of equiaxed grain in order to improve slab, reduces center segregation, improves slab internal soundness.
Step 2: slab reheats;
For ensureing certain compression ratio and slab quality, select the continuously cast bloom that 250mm is thick.Adopt the thick continuously cast bloom of 250mm to produce, the tapping temperature 1180-1210 DEG C that continuously cast bloom (slab) reheats, 270～410 minutes heat-up times.
Step 3: steel plate rolling moulding;
Slab adds after reheating and carries out controlled rolling, and first stage open rolling thickness is slab thickness, 1170～1200 DEG C of first stage start rolling temperatures, single pass draft >=10% when first stage (roughing) high temperature extends rolling, 3～5 passages of rolling; The open rolling thickness of subordinate phase (finish rolling) steel plate is 1.3～2 times of finished steel plate thickness, subordinate phase steel plate start rolling temperature is 860～890 DEG C, subordinate phase finishing temperature is 820～850 DEG C, and 4～6 passages of rolling, have a time draft >=11% at least.
The above-mentioned continuously cast bloom heating is carried out to controlled rolling in austenite recrystallization district.First stage controlled rolling belongs to the austenite recrystallization controlled rolling of high-temperature zone, and this one-phase adopts low speed, the rolling strategy depressed greatly.Large single pass draft can make distortion fully infiltrate into steel plate center, fully refine austenite crystal grain homogeneous austenite structure, the defects such as loose, the tiny crack of strand inside have been eliminated in the high temperature seam effect that simultaneously rolling produces to a great extent, and the density of steel plate is improved; Temperature when low speed rolling makes the complete temperature of every a time rolling lower than upper a time rolling, because the size of crystal grain after steel plate recrystallization depends primarily on temperature at that time, every like this rolling a time will be carried out refinement in various degree to crystal grain, finally reaches the object of abundant refine austenite crystal grain; While also having rolling, roll speed is low, and resistance to deformation is little, easily realizes larger single pass draft.
Containing Nb etc., can be under subordinate phase comparatively high temps separate out the alloying element of Section 2 particle due to the chemical composition of this steel grade when rolling, the therefore main or recrystallize controlled rolling of the rolling of subordinate phase.After first stage controlled rolling finishes; intermediate blank swings cooling on roller-way, and cooling method is natural air cooling, is cooled to subordinate phase start rolling temperature and starts rolling; when subordinate phase rolling; austenite crystal is by broken, recrystallization softening repeatedly, and austenite crystal is finally on rolling refined basis of first stage, again by further refinement like this; and due to after subordinate phase rolls; finishing temperature is lower, and austenite crystal is substantially no longer grown up, and finally obtains tiny austenite crystal.Austenite crystal is more tiny, and its grain boundary area is larger, and the nucleation site by austenite during to ferritic transformation is just more, and nucleation rate is just higher, and the ferrite crystal grain finally obtaining is just more tiny, and the intensity of steel plate is higher, and impelling strength is better.
Step 4: it is cooling to carry out laminar flow after steel plate rolls, and speed of cooling is 5～8 DEG C/s, and final cooling temperature is 640～690 DEG C.
Roll rear employing laminar flow cooling, steel plate be quickly cooled to 640～690 DEG C by finishing temperature, further reduced austenite to ferritic transition temperature, further refinement ferrite crystal grain, for thermal treatment is ready to good steel plate tissue.
Step 5: stacking slow cooling;
After steel plate rolls, need roll off the production line immediately and carry out stacking slow cooling, require the stacking slow cooling temperature of steel plate to be greater than 200 DEG C.
Step 6: roll rear steel plate and carry out normalizing treatment.
The temperature of normalizing is 870 DEG C, and 870 DEG C of insulations 20 minutes.Normalizing adopts natural air cooling mode cooling after coming out of the stove.
The thickness that the thick specification guarantor of finished product flaw detection S355J2 adds boron plate is 50mm～100mm.Its chemical composition by weight percentage, comprise: C0.17～0.19%, Si0.35～0.45%, Mn1.45～1.6%, P≤0.02%, S≤0.005%, V0.025～0.035%, Ca0.0015～0.003%, Als (acid-soluble aluminium) 0.017～0.03%, all the other are iron and inevitable impurity.
Because the compression ratio of Plate Steel is little, and roll steel plate heart portion and surface temperature when cooling and differ larger, cause steel plate through-thickness histological difference large, to controlled rolling, control steel plate after cold heat-treat can be further the even tissue of steel plate, improve plate property.
The normalizing temperature of steel plate and normalizing time, tiny to obtain, uniform austenite crystal was as the criterion, and normalizing temperature is too high, and austenite crystal is thick, affects plate property; Normalizing temperature is too low, and austenite crystal is inhomogeneous, occurs mixed crystal phenomenon, affects the performance uniformity of steel plate.
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Adopting thickness is 250mm slab, slab tapping temperature is 1180 DEG C, the heating of plate blank time is 270 minutes, (weight percent) chemical composition of slab is: C0.17%, Si0.0.35%, Mn1.45%, P0.02%, S0.003%, V0.025%, Als0.017%, Ca0.0015%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 60mm, detailed rolling and the cold technique of going are in table 1, and its mechanical property is in table 2.Steel plate meets one-level flaw detection requirement.
As shown in Figure 1, be the metallographic structure figure of the steel plate of embodiment in the present invention 1.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, crystal grain is tiny evenly, there is no mixed crystal phenomenon.Because ferrite is in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 1 rolling and process for cooling
Table 2 mechanical property of steel plate
Embodiment 2
Adopting thickness is 250mm slab, slab tapping temperature is 1210 DEG C, the heating of plate blank time is 410 minutes, (weight percent) chemical composition of slab is: C0.19%, Si0.0.45%, Mn1.55%, P0.012%, S0.005%, V0.035%, Als0.026%, Ca0.002%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 100mm, detailed rolling and the cold technique of going are in table 3, and its mechanical property is in table 4.Steel plate meets one-level flaw detection requirement.
As shown in Figure 2, be the metallographic structure figure of the steel plate of embodiment in the present invention 2.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, crystal grain is tiny evenly, there is no mixed crystal phenomenon.Because ferrite is in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 3 rolling and process for cooling
Table 4 mechanical property of steel plate
Embodiment 3
Adopting thickness is 250mm slab, slab tapping temperature is 1202 DEG C, the heating of plate blank time is 373 minutes, (weight percent) chemical composition of slab is: C0.18%, Si0.45%, Mn1.6%, P0.007%, S0.002%, V0.029%, Als0.03%, Ca0.003%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 50mm, detailed rolling and the cold technique of going are in table 5, and its mechanical property is in table 6.Steel plate meets one-level flaw detection requirement.
As shown in Figure 3, be the metallographic structure figure of the steel plate of embodiment in the present invention 3.Can find out from this metallograph, steel plate be organized as ferrite+perlite, ferrite is in the great majority, crystal grain is tiny evenly, there is no mixed crystal phenomenon.Because ferrite is in the great majority, crystal grain is tiny, and ferrite has good plasticity, toughness, and therefore the steel plate of this tissue has good toughness and higher intensity.
Table 5 rolling and process for cooling
Table 6 mechanical property of steel plate
Claims (9)
1. a thick specification guarantor flaw detection S355J2 adds boron plate, it is characterized in that, its chemical composition by weight percentage, comprise: C0.17～0.19%, Si0.35～0.45%, Mn1.45～1.6%, P≤0.02%, S≤0.005%, V0.025～0.035%, Ca0.0015～0.003%, Als0.017～0.03%, all the other are iron and impurity.
2. thick specification guarantor flaw detection S355J2 adds boron plate as claimed in claim 1, it is characterized in that, its chemical composition by weight percentage, comprise: C0.17%, Si0.0.35%, Mn1.45%, P0.02%, S0.003%, V0.025%, Als0.017%, Ca0.0015%, all the other are iron and impurity.
3. thick specification guarantor flaw detection S355J2 adds boron plate as claimed in claim 1, it is characterized in that, its chemical composition by weight percentage, comprise: C0.19%, Si0.0.45%, Mn1.55%, P0.012%, S0.005%, V0.035%, Als0.026%, Ca0.002%, all the other are iron and impurity.
4. thick specification guarantor flaw detection S355J2 adds boron plate as claimed in claim 1, it is characterized in that, its chemical composition by weight percentage, comprise: C0.18%, Si0.45%, Mn1.6%, P0.007%, S0.002%, V0.029%, Als0.03%, Ca0.003%, all the other are iron and impurity.
5. thick specification is protected the production method that flaw detection S355J2 adds boron plate, it is characterized in that: comprise that smelting, continuous casting, slab reheat, steel plate rolling moulding, laminar flow are cooling, the step of stacking slow cooling and normalizing treatment, wherein,
In casting process, use induction stirring and light pressure, the frequency of induction stirring is 6Hz, and electric current is 300A, and light draught of pressing is 2.0mm;
Slab reheats in process, adopts the thick continuously cast bloom of 250mm to produce, the tapping temperature 1180-1210 DEG C reheating, 270～410 minutes heat-up times;
In steel plate rolling moulding process, first stage open rolling thickness is slab thickness, 1170～1200 DEG C of first stage start rolling temperatures, single pass draft >=10% when first stage high temperature extends rolling, 3～5 passages of rolling; The open rolling thickness of subordinate phase steel plate is 1.3～2 times of finished steel plate thickness, and subordinate phase steel plate start rolling temperature is 860～890 DEG C, and subordinate phase finishing temperature is 820～850 DEG C, and 4～6 passages of rolling, have a time draft >=11% at least;
In laminar cooling process, speed of cooling is 5～8 DEG C/s, and final cooling temperature is 640～690 DEG C; In stacking slow cooling process, require the stacking slow cooling temperature of steel plate to be greater than 200 DEG C;
In normalizing treatment process, the temperature of normalizing is 870 DEG C, and 870 DEG C of insulations 20 minutes.Normalizing adopts natural air cooling mode cooling after coming out of the stove;
The thickness that the thick specification guarantor of finished product flaw detection S355J2 adds boron plate is 50mm～100mm, its chemical composition by weight percentage, comprise: C0.17～0.19%, Si0.35～0.45%, Mn1.45～1.6%, P≤0.02%, S≤0.005%, V0.025～0.035%, Ca0.0015～0.003%, Als0.017～0.03%, all the other are iron and impurity.
6. thick specification is protected the production method that flaw detection S355J2 adds boron plate as claimed in claim 5, it is characterized in that: slab tapping temperature is 1180 DEG C, the heating of plate blank time is 270 minutes, 1170 DEG C of first stage start rolling temperatures, and first stage high temperature extends the minimum single pass draft 12% of rolling, subordinate phase open rolling thickness 108mm, 880 DEG C of subordinate phase start rolling temperatures, 850 DEG C of subordinate phase finishing temperatures, 6 DEG C/s of speed of cooling, 640 DEG C of final cooling temperatures, 870 DEG C of normalizing temperatures; Finished steel plate thickness is 60mm, and its chemical composition by weight percentage, comprising: C0.17%, Si0.0.35%, Mn1.45%, P0.02%, S0.003%, V0.025%, Als0.017%, Ca0.0015%, surplus is Fe and impurity.
7. thick specification is protected the production method that flaw detection S355J2 adds boron plate as claimed in claim 5, it is characterized in that: slab tapping temperature is 1210 DEG C, the heating of plate blank time is 410 minutes, 1200 DEG C of first stage start rolling temperatures, and first stage high temperature extends the minimum single pass draft 10% of rolling, subordinate phase open rolling thickness 130mm, 860 DEG C of subordinate phase start rolling temperatures, 832 DEG C of subordinate phase finishing temperatures, 5 DEG C/s of speed of cooling, 658 DEG C of final cooling temperatures, 870 DEG C of normalizing temperatures; Finished steel plate thickness is 100mm, and its chemical composition by weight percentage, comprising: C0.19%, Si0.0.45%, Mn1.55%, P0.012%, S0.005%, V0.035%, Als0.026%, Ca0.002%, surplus is Fe and impurity.
8. thick specification is protected the production method that flaw detection S355J2 adds boron plate as claimed in claim 5, it is characterized in that: slab tapping temperature is 1202 DEG C, the heating of plate blank time is 373 minutes, 1192 DEG C of first stage start rolling temperatures, and first stage high temperature extends the minimum single pass draft 14% of rolling, subordinate phase open rolling thickness 100mm, 890 DEG C of subordinate phase start rolling temperatures, 810 DEG C of subordinate phase finishing temperatures, 8 DEG C/s of speed of cooling, 690 DEG C of final cooling temperatures, 870 DEG C of normalizing temperatures; Finished steel plate thickness is 50mm, and its chemical composition by weight percentage, comprising: C0.18%, Si0.45%, Mn1.6%, P0.007%, S0.002%, V0.029%, Als0.03%, Ca0.003%, surplus is Fe and impurity.
9. thick specification is protected the production method that flaw detection S355J2 adds boron plate as claimed in claim 5, it is characterized in that: in smelting and casting process, molten iron adopts the desulfurization of magnesium base, adopts top bottom blowing in converter; Molten steel, through the refining of LF stove, requires S≤0.003% in molten steel; Molten steel carries out the processing of RH stove, is no more than the treatment time under 133Pa is not less than 30 minutes in vacuum tightness; The thickness of continuously cast bloom is 250mm, adopts induction stirring and gently depress when continuous casting, and induction stirring frequency is 6Hz, electric current 280A, and depressing position is 6,7,8 sections, draught is 2mm, 2mm, 2mm.
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| CN106148817A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | Production method of S355J2 wind power steel |
| CN115466830A (en) * | 2022-09-20 | 2022-12-13 | 包头钢铁（集团）有限责任公司 | Method for improving Q355ME wind power steel strip-shaped structure |
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