CN106086686B - With the tensile strength >=2100MPa hot formings steel and production method of medium thin slab Direct Rolling - Google Patents

With the tensile strength >=2100MPa hot formings steel and production method of medium thin slab Direct Rolling Download PDF

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CN106086686B
CN106086686B CN201610713644.4A CN201610713644A CN106086686B CN 106086686 B CN106086686 B CN 106086686B CN 201610713644 A CN201610713644 A CN 201610713644A CN 106086686 B CN106086686 B CN 106086686B
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CN106086686A (en
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毛新平
胡宽辉
汪水泽
潘利波
葛锐
李立军
彭涛
杜晓峰
段小平
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Wuhan Iron and Steel Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

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  • Engineering & Computer Science (AREA)
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  • Heat Treatment Of Sheet Steel (AREA)

Abstract

With tensile strength >=2100MPa hot forming steel, its component and wt% of medium thin slab Direct Rolling：C:0.41~0.50%, Si：0.45~0.65%, Mn：1.6~2.0, P≤0.006, S≤0.004, Als：0.015~0.060, Cr：0.55~0.65, Ti：0.046~0.060 or Nb：0.046~0.060 or V：0.046~0.060 or two of which more than compound, B：0.004~0.005, Mo：0.46~0.60, Ni：0.25~0.40, N≤0.004.Production stage：Desulfurizing iron；Electric furnace or converter smelting and refining；Continuous casting；Enter the processing of the de-scaling before soaking pit；Soaking；Heating；High-pressure water descaling before feed mill；Rolling；Cooling；Batch；Austenitizing；Mould punching shapes；Quenching.Its intensity of the invention is high, and manufacturing process is short, and product surface quality is good, and thickness and precision is high, and has significantly saved energy resource consumption, is significant for automobile lightweight.

Description

With tensile strength >=2100MPa hot formings steel of medium thin slab Direct Rolling and production Method
Technical field
The present invention relates to a kind of auto parts and components steel and its production method, it is direct to specifically belong to one kind medium thin slab The tensile strength of rolling >=2100MPa hot formings steel and production method, and it is more than 2 to 10mm suitable for the product thickness of production.
Background technology
As automobile industry development and automobile industry are gradually sent out Automobile Design and manufacture to energy-saving and environmental protection, safe direction Exhibition, automotive light weight technology turn into the main flow direction of significant period of time Automobile Design at present and in the future.
Research finds that the complete vehicle weight of automobile and energy resource consumption are linear.According to statistics, vehicle weight often reduces by 10% Then fuel efficiency can improve 6%~8%.One of most important approach of automotive light weight technology is to use high intensity and unimach, from And can make while crashworthiness and comfortableness is not reduced, automobile weight in working order can be greatly reduced by adopting.But with intensity Improve constantly, the forming property of steel plate can worse and worse, especially more than 2100MPa unimach, in forming process There can be the problems such as cracking, resilience and accessory size do not reach permissible accuracy, and also pressing equipment be proposed simultaneously higher Requirement, that is, need the stamping machine and high abrasion mould of large-tonnage, and also have large effect to the mold use cycle.Mesh The preceding country is also without the cold forming pressing equipment and mould that can shape more than 2100MPa.
Currently, both at home and abroad the tensile strength of existing hot forming steel can not reach 2100MPa and more than, and all using cold Roll annealed state or cold rolled annealed rear precoated shet.Its technological process of production is：Desulphurised hot metal → converter smelting → external refining → company Casting → heating of plate blank → hot continuous rolling → pickling+cold continuous rolling → continuous annealing →（Precoated shet）→ finishing packaging → blanking → heating → Mould punching quenches.Have that the technological process of production is longer, the higher deficiency of cost.Adopted for some impact resistant or load bearing component Impact resistant and bearing capacity are improved with multiple part combination components, and causes to greatly improve the cost of raw material and is processed into This.
With the development of steel and iron industry, medium thin slab continuous casting and rolling technique has obtained tremendous development, is connected using medium thin slab The mm specification steel plates of ＞ 2.0~10 and steel band can be produced with Direct Rolling by casting continuous rolling process, and some can only use cold rolling high-strength originally The Thin Specs part of steel is progressively directly rolled using casting and rolling process for increase intensity using the structure of multiple parts composition Ultrahigh-strength steel plates processed are replaced.Such as the document that China Patent Publication No. is CN 102965573A, yield strength is developed（ReL） >=700MPa, tensile strength（Rm）>=750MPa engineering structure high strength steel, its component percentages are：C:0.15~ 0.25%, Si:≤ 0.10%, Mn:1.00~1.80%, P:≤ 0.020%, S≤0.010%, Ti:0.09~0.20%, Als: 0.02~0.08%, N≤0.008%, remaining is Fe and is inevitably mingled with；Its production stage enters to smelt and being casting continuously to form base Row soaking, for control soaking temperature at 1200~1300 DEG C, soaking time is 20~60min；Rolled, and control start rolling temperature Not less than 1200 DEG C, finishing temperature is at 870~930 DEG C；Section cooling is carried out, is cooled down under being not less than 20 DEG C/s in cooling velocity To coiling temperature；Batched, and control coiling temperature at 580~650 DEG C.Also China Patent Publication No. is CN 103658178A document, disclose a kind of method of short route production high-strength thin strip steel, the strip yield strength invented （ReL）>=550MPa, tensile strength（Rm）>=600MPa, its chemical composition mass percent are：C:0.02~0.15%, Si: 0.20~0.6%, Mn:0.2~1.50%, P:0.02~0.3%, S≤0.006%, Cr:0.40~0.8%, Ni:0.08~ 0.40%, Cu:0.3~0.80%, Nb:0.010~0.025%, Ti:0.01~0.03%, Al:0.01~0.06%, Re:0.02~ 0.25%;Remaining is Fe and inevitable impurity, and the thick Cast Strips of 1.0~2.0mm, 60~150m/ of casting rate are cast into after smelting Min, rolled, control 850~1000 DEG C of finishing temperature；Cooled down, 50~100 DEG C/s of cooling velocity, rolled up using atomization Take, it is 520~660 DEG C to control coiling temperature.The tensile strength of above-mentioned two document is very low, it is impossible to meets high-end body of a motor car pair The demand of more than 2100MPa superhigh intensitys.
The content of the invention
The invention reside in overcoming, intensity rank existing for prior art is low, it is impossible to meet rigidity by user requirement not Foot, there is provided a kind of both to have met requirement of the Automobile Design to superhigh intensity mechanical property, and can smoothly completes complex deformation, and Without resilience after deformation, the high tensile strength >=2100MPa hot formings steel of the dimensional accuracy of part and production method.
Realize the measure of above-mentioned purpose：
With tensile strength >=2100MPa hot forming steel, its component and weight percent content of medium thin slab Direct Rolling For：C:0.41~0.50%, Si：0.45~0.65%, Mn：1.6~2.0, P≤0.006, S≤0.004, Als：0.015~ 0.060, Cr：0.55~0.65, Ti：0.046~0.060 or Nb：0.046~0.060 or V：0.046~0.060 or wherein two Compound, B more than kind：0.004~0.005, Mo：0.46~0.60, Ni：0.25~0.40, N≤0.004, it is remaining for Fe and can not The impurity avoided；Metallographic structure after quenching is full lath martensite；Mechanical property：The MPa of yield strength >=1450, tension are strong Degree >=2100MPa, elongation A80mm≥5%。
The production method of the tensile strength 2100MPa hot forming steel of medium thin slab Direct Rolling, it is：Its step：
1）Desulfurizing iron, and S≤0.002% is controlled, molten iron exposed surface is not less than 96% after skimming；
2）Conventional electric furnace or converter smelting, and conventional refinery；
3）Continuous casting is carried out, bag molten steel overheat is at 15~30 DEG C in control, and slab thickness is in 61~150mm, casting speed In 3.0~5.0 m/min；
4）Carry out strand and enter the de-scaling processing before soaking pit, and control the pressure of de-scaling water in 300~400 bar；
5）Conventional soaking is carried out to strand, is in weak oxide atmosphere in control soaking pit, though remaining oxygen is 0.5 in stove~ 5.0%；
6）Strand is entered to heat, and controls strand charging temperature at 800~1000 DEG C, tapping temperature is 1185~ 1215℃；
7）The high-pressure water descaling before feed mill is carried out, and controls de-scaling water pressure in 280~420bar；
8）Rolling, and control the first percentage pass reduction to be：40~50%, the second percentage pass reduction is：40~50%, extreme trace Reduction ratio is：10~16%；Controlled rolling speed is in 3~8 m/s；And press water in being carried out between the first passage and second time De-scaling, de-scaling water pressure are 200~280bar；Finishing temperature is controlled at 860~900 DEG C；
9）Cooled down, the type of cooling is cooled to for the mode of section cooling or Water-Curta in Cooling or encryption cooling and batches temperature Degree；
10）Batched, and it is 565 ~ 595 DEG C to control coiling temperature；
11）The austenitizing after uncoiling blanking is carried out, control austenitizing temperature is incubated 6~15 at 930~980 DEG C min；
12）Mould punching shapes, and the s of pressurize 6~9 in mould；
13）Quenched, control quenching cooling velocity is in 50~100 DEG C/s；After naturally cool to room temperature.
It is：The operation of rolling of the medium thin slab is 6F producing lines or 1R+6F producing lines or 2R+ in rolling mill layout The short route production of any one arrangement form of 6F producing lines or 7F producing lines or 3R+4F producing lines or 2R+5F producing lines or 1R+5F producing lines Line is carried out.
The effect of each element and main technique and mechanism in the present invention
C：Carbon is strong solution strengthening element, to being played a decisive role for superhigh intensity, group of the carbon content to final products Knitting form and performance has considerable influence, but content is too high, easily formed in the cooling procedure after finish rolling substantial amounts of pearlite or Bainite, martensite, its content is higher, and intensity is higher, and so as to cause plasticity to reduce, the blanking before being formed is difficult.So On the premise of heat treatment reinforcement is ensured, carbon content is not easy too high.Therefore its content is limited to 0.41~0.60% scope.
Si：Silicon has stronger solid solution strengthening effect, can improve the intensity of steel, meanwhile, silicon can improve the quenching degree of steel, have and subtract Few effect of the austenite to Volume Changes during martensite transfor mation, so as to effectively control the generation of hardening flaw；In lonneal Carbon diffusion can be hindered, delays the speed of martensite decomposition and carbide agglomeration, declines steel hardness in tempering slower, Significantly improve steel belt roof bolt stability and intensity.So its content is limited to 0.45~0.65% scope.
Mn：Manganese plays solution strengthening effect, while can remove the FeO in steel, significantly improves the quality of steel.Can also be with sulfide Dystectic MnS is generated, in hot-working, MnS has enough plasticity, steel is not produced hot-short phenomenon, mitigates harmful work of sulphur With improving the hot-working character of steel.Manganese can reduce phase driving force, move to right " C " curve, improve the quenching degree of steel, expand γ Phase region, separately it can reduce the Ms points of steel, therefore can ensure to obtain martensite under suitable cooling velocity.So its content is limited It is scheduled on 1.6~2.0% scopes.
Cr：Chromium can reduce phase driving force, and the forming core of carbide is grown up when also reducing phase transformation, so improving the through hardening of steel Property.In addition, chromium can improve steel belt roof bolt stability.So its content is limited to 0.50~0.65% scope.
B:Boron is strong raising quenching degree element, and the quenching degree of steel can be significantly improved by adding micro boron element in steel.But It is that its content is less than 0.0005%, or higher than 0.0050%, the effect unobvious to improving quenching degree.So to consider to give birth to Reality and quenching degree effect are produced, its content is limited to 0.004~0.005% scope.
Als, it plays deoxidation in steel, and should ensure that in steel has a certain amount of dissolved aluminum, otherwise can not play its effect, But excessive aluminium also can be mingled with generation aluminium system in steel, and be unfavorable for the smelting and casting of steel.Simultaneously appropriate aluminium is added in steel Nitrogen in steel, oxygen atom can be eliminated to the adverse effect of performance.Therefore its content is limited to 0.015~0.060% scope.
P：Phosphorus is the harmful element in steel, easily causes center segregation of casting blank.In subsequent hot continuous rolling heating process easily partially Gather crystal boundary, significantly increase the fragility of steel.While based on cost consideration and the performance of steel is not influenceed, the control of its content is existed Less than 0.006%.
S：Sulphur is very harmful element.Sulphur in steel often exists with the oxide morphology of manganese, this sulphide inculsion meeting Deteriorate the toughness of steel, and cause the anisotropy of performance, therefore, sulfur content in steel need to be controlled more low better.Based on to system This consideration is caused, by sulfur content control in steel below 0.004%.
N：Nitrogen can combine to form titanium nitride in the steel for add titanium with titanium, and this second phase separated out at high temperature is advantageous to by force Change matrix, and improve the welding performance of steel plate.But nitrogen content, higher than 0.005%, the solubility product of nitrogen and titanium is higher, in high temperature The thick titanium nitride of particle will be formed in steel, the serious plasticity and toughness for damaging steel；In addition, higher nitrogen content can make stabilization Micro alloying element content increase needed for nitrogen, so as to increase cost.Therefore by the control of its content below 0.004%.
Ti：Titanium is strong C, N compound formation element, and the purpose that Ti is added in steel is the N element in fixed steel, but excessive Ti can be combined with C so as to reduce the hardness and intensity of martensite after experiment steel quenches.In addition, the addition of titanium has to the quenching degree of steel Certain contribution.So its content is limited to 0.046~0.060% scope.
Nb、V:Niobium and vanadium are also strong C, N compound formation element, can play a part of fining austenite grains, be added in steel A small amount of niobium or vanadium can forms the carbon of a certain amount of niobium, nitride, and so as to hinder Austenite Grain Growth, therefore, it is quenched Martensite lath size after fire is smaller, greatly improves the intensity of steel.Therefore by its content control 0.046~0.060% it Between.
Mo：Molybdenum can significantly improve the quenching degree of steel, and the stacking fault energy of molybdenum is higher, and the low temperature modeling of steel can be improved by adding in steel Property and toughness.Therefore by the control of its content between 0.36~0.60%.
Ni：Nickel, which is added in steel, can improve the intensity of steel without significantly reducing its toughness.Simultaneously can improve steel processability and Solderability.In addition, nickel can improve the resistance to corrosion of steel, can not only be acidproof, and the corrosion of energy alkali resistant and air.So will Its content is limited to 0.21~0.35%.
Why the present invention takes de-scaling three times in whole production process, is due to by controlling de-scaling passage and suitable De-scaling water pressure, the iron scale of belt steel surface can be removed as far as possible, so as to ensure that strip has good surface matter Amount.
Compared with prior art, its intensity is high, and manufacturing process is short, and product surface quality is good by the present invention, and thickness and precision is high, energy Enough reach the quality requirement of cold-rolled products, significantly save energy resource consumption；In addition, with existing medium thin slab Direct Rolling product phase Than its intensity is significantly larger than existing product, is significant for automobile lightweight.
Brief description of the drawings
Fig. 1 is product metallographic structure figure of the present invention.
Embodiment
The present invention is described in detail below：
Table 1 is the chemical composition comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters comparative example of various embodiments of the present invention and comparative example；
Table 3 is the performance text list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention press following technique productions：
1）Desulfurizing iron, and S≤0.002% is controlled, molten iron exposed surface is not less than 96% after skimming；
2）Conventional electric furnace or converter smelting, and conventional refinery；
3）Continuous casting is carried out, bag molten steel overheat is at 15~30 DEG C in control, and slab thickness is in 61~150mm, casting speed In 3.0~5.0 m/min；
4）Carry out strand and enter the de-scaling processing before soaking pit, and control the pressure of de-scaling water in 300~400 bar；
5）Conventional soaking is carried out to strand, is in weak oxide atmosphere in control soaking pit, though remaining oxygen is 0.5 in stove~ 5.0%；
6）Strand is entered to heat, and controls strand charging temperature at 800~1000 DEG C, tapping temperature is 1185~ 1215℃；
7）The high-pressure water descaling before feed mill is carried out, and controls de-scaling water pressure in 280~420bar；
8）Rolling, and control the first percentage pass reduction to be：40~50%, the second percentage pass reduction is：40~50%, extreme trace Reduction ratio is：10~16%；Controlled rolling speed is in 3~8 m/s；And press water in being carried out between the first passage and second time De-scaling, de-scaling water pressure are 200~280bar；Finishing temperature is controlled at 860~900 DEG C；
9）Cooled down, the type of cooling is cooled to for the mode of section cooling or Water-Curta in Cooling or encryption cooling and batches temperature Degree；
10）Batched, and it is 565 ~ 595 DEG C to control coiling temperature；
11）The austenitizing after uncoiling blanking is carried out, control austenitizing temperature is incubated 6~15 at 930~980 DEG C min；
12）Mould punching shapes, and the s of pressurize 6~9 in mould；
13）Quenched, control quenching cooling velocity is in 50~100 DEG C/s；After naturally cool to room temperature.
The operation of rolling of the medium thin slab rolling mill layout be 6F producing lines or 1R+6F producing lines or 2R+6F producing lines, Or the short route producing line of 7F producing lines or 3R+4F producing lines or 2R+5F producing lines or 1R+5F producing lines any one arrangement form is carried out .
The chemical composition of the various embodiments of the present invention of table 1 and comparative example（wt.%）
Embodiment C Si Mn P S Als Cr Ti Nb V Mo Ni B N
1 0.48 0.55 1.6 0.003 0.001 0.027 0.55 0.057 — — 0.46 0.38 0.0043 0.002
2 0.42 0.60 1.9 0.004 0.003 0.035 0.57 0.046 0.049 — 0.48 0.32 0.0047 0.004
3 0.41 0.65 1.7 0.003 0.002 0.028 0.64 — 0.060 — 0.60 0.26 0.0040 0.004
4 0.49 0.48 1.8 0.004 0.004 0.060 0.54 — 0.046 0.050 0.46 0.35 0.0048 0.005
5 0.50 0.45 1.95 0.006 0.001 0.015 0.58 0.060 — — 0.58 0.25 0.0050 0.003
6 0.43 0.63 2.0 0.005 0.002 0.057 0.65 — — 0.060 0.55 0.30 0.0049 0.002
7 0.47 0.50 1.75 0.002 0.002 0.042 0.62 0.050 — 0.046 0.49 0.40 0.0041 0.003
The main technologic parameters comparative example of the various embodiments of the present invention of table 2 and comparative example
The mechanical property situation list of the various embodiments of the present invention of table 3 and comparative example
From table 3 it can be seen that the intensity that the application is successfully realized invention steel by shorter technological process reaches More than 2100MPa, for promoting the development of automotive light weight technology to be significant.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.

Claims (2)

1. the production method of the tensile strength 2100MPa hot forming steel with medium thin slab Direct Rolling, it is characterised in that：It is walked Suddenly：
With tensile strength >=2100MPa hot forming steel of medium thin slab Direct Rolling, its component and weight percent content are：C: 0.41~0.50%, Si：0.55~0.65%, Mn：1.6~2.0, P≤0.006, S≤0.004, Als：0.015~0.060, Cr：0.55~0.65, Ti：0.046~0.060 or Nb：0.046~0.060 or V：0.046~0.060 or two of which more than Compound, B：0.004~0.005%, Mo：0.46~0.49%, Ni：0.25~0.40%, N≤0.004%, it is remaining Fe and can not to keep away The impurity exempted from；Metallographic structure after quenching is full lath martensite；Mechanical property：The MPa of yield strength >=1450, tensile strength >=2100MPa, elongation A80mm≥5%；
1）Desulfurizing iron, and S≤0.002% is controlled, molten iron exposed surface is not less than 96% after skimming；
2）Conventional electric furnace or converter smelting, and conventional refinery；
3）Continuous casting is carried out, bag molten steel overheat is at 15~30 DEG C in control, and slab thickness is in 61~150mm, and casting speed is 3.0 ~5.0 m/min；
4）Carry out strand and enter the de-scaling processing before soaking pit, and control the pressure of de-scaling water in 300~400 bar；
5）Conventional soaking is carried out to strand, is in weak oxide atmosphere in control soaking pit, even if remaining oxygen is 0.5~5.0% in stove；
6）Strand is heated, and controls strand charging temperature at 800~1000 DEG C, tapping temperature is 1185~1215 DEG C；
7）The high-pressure water descaling before feed mill is carried out, and controls de-scaling water pressure in 280~420bar；
8）Rolling, and control the first percentage pass reduction to be：40~50%, the second percentage pass reduction is：40~50%, extreme trace time pressure Rate is：10~16%；Controlled rolling speed is in 3~8 m/s；And water de-scaling is pressed in being carried out between the first passage and second time, De-scaling water pressure is 200~280bar；Finishing temperature is controlled at 860~900 DEG C；
9）Cooled down, the type of cooling is cooled to coiling temperature for the mode of section cooling or Water-Curta in Cooling or encryption cooling；
10）Batched, and it is 565 ~ 595 DEG C to control coiling temperature；
11）The austenitizing after uncoiling blanking is carried out, control austenitizing temperature is incubated 6~15 min at 930~980 DEG C；
12）Mould punching shapes, and the s of pressurize 6~9 in mould；
13）Quenched, control quenching cooling velocity is in 50~100 DEG C/s；After naturally cool to room temperature.
2. the production method of the tensile strength 2100MPa hot forming steel of medium thin slab Direct Rolling is used as claimed in claim 1, It is characterized in that：The operation of rolling of the medium thin slab is 6F producing lines or 1R+6F producing lines or 2R+6F productions in rolling mill layout The short route producing line of any one arrangement form of line or 7F producing lines or 3R+4F producing lines or 2R+5F producing lines or 1R+5F producing lines is entered OK.
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