CN103014538B - A kind of yield strength 960MPa grade high-strength steel plate and manufacture method thereof - Google Patents
A kind of yield strength 960MPa grade high-strength steel plate and manufacture method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of high tensile steel plate, the weight percent of its composition is: C:0.08-0.12%, Si:0.36-1.00%, Mn:1.2-1.6%, P≤0.015%, S≤0.010%, Al:0.02-0.04%, Ti:0.01-0.03%, N≤0.006%, Ca≤0.005%, and Cr≤0.70%, Ni≤0.30%, more than a kind in Mo≤0.30%, surplus is iron and inevitable impurity.Its manufacture method comprises: molten steel carries out continuous casting and becomes continuously cast bloom or die casting also just to roll into steel billet after Fruit storage; Continuously cast bloom or steel billet carry out a time or multi-pass rolling after 1150-1200 DEG C of heating, and total reduction is not less than 70%; Finishing temperature is not less than 860 DEG C; Roll rear steel plate to be greater than V
minspeed of cooling rapid water to 50 DEG C/s is chilled to 200-240 DEG C of temperature range air cooling 5-60s; Steel plate enters online induction heater and quickly heats up to 510-550 DEG C of tempering 15-25s with 1-10 DEG C/s, air cooling of then coming out of the stove.The 6-25mm Plate Steel yield strength>=960MPa obtained, unit elongation A
50>=18%, the A of-60 DEG C
kv>=50J, cold-bending property is excellent, is suitable for the impact-resistant structural part of the high strength such as automobile, engineering machinery etc.
Description
Technical field
The present invention relates to a kind of high tensile steel plate, relate to a kind of yield strength particularly in the high tensile steel plate of more than 960MPa and manufacture method thereof.Steel plate of the present invention has good low-temperature flexibility, is suitable as the high-yield strength steel plate of the impact-resistant structural part of the high strength such as automobile, engineering machinery.
Background technology
Hi-Stren steel, as a kind of important ferrous materials, is widely used in the departments such as automobile, mining machinery, engineering machinery, agricultural machine and transportation by railroad.Along with the develop rapidly of China's industry, all kinds of mechanical means complicated, maximize and lightweight such steel is had higher requirement, namely the low-alloy high-strength steel plate for the manufacture of these equipment not only requires to have higher hardness, intensity, but also requires good toughness and processability.Traditional technology is when producing low-alloy high-strength steel plate, and the expensive alloying elements such as Cu, Ni, Cr and Mo that many interpolations are more, cost is higher, and current high-strength steel starts and high cost high-performance future development economical to low cost.
Some related productss and patent application is had at present in the above high-strength steel field of yield strength 960MPa.
CN1840724A adopts TMCP rolling, and roll rear water-cooled to Ms-Ms+100 DEG C, then off-line reheats to 350-550 DEG C of tempering, and the steel plate obtained is at the A of-40 DEG C
kvfor 33-50J.
Need at present to provide more economical and good more than the 960MPa high tensile steel plate of low-temperature flexibility.
Summary of the invention
A kind of yield strength is the object of the present invention is to provide to be the steel plate of 6-25mm at the high-strength steel plate of moderate thickness, particularly thickness of more than 960MPa.
For achieving the above object, yield strength of the present invention is the high tensile steel plate of more than 960MPa, and the weight percent of its composition is: C:0.08-0.12%, Si:0.36-1.00%, Mn:1.2-1.6%, P≤0.015%, S≤0.010%, Al:0.02-0.04%, Ti:0.01-0.03%, N≤0.006%, Ca≤0.005%, and Cr≤0.70%, Ni≤0.30%, more than a kind in Mo≤0.30%, surplus is iron and inevitable impurity.
Preferably, C:0.082-0.12%.
Preferably, Si:0.5-1.0%, more preferably Si:0.4-0.97%.
Preferably, Mn:1.2-1.59%.
Preferably, P≤0.01%.
Preferably, S≤0.005%.
Preferably, Al:0.025-0.039%.
Preferably, Ti:0.01-0.02%, more preferably Ti:0.011-0.019%.
Preferably, N≤0.005%.
Preferably, Ca≤0.002%.
Preferably, Cr:0.50-0.70%, is more preferably 0.50-0.69%.
Preferably, Ni:0.15-0.25%.
Preferably, Mo:0.15-0.25%.
Described steel plate of the present invention be organized as tempered martensite and carbide.Preferably, in the tissue of described steel plate of the present invention, more than 90% is tempered martensite.
In the present invention, unless otherwise, content all refers to weight percent content.
Another object of the present invention is to provide above-mentioned yield strength to be the manufacture method of the high tensile steel plate of more than 960MPa, and the method comprises:
Molten steel carries out continuous casting and becomes continuously cast bloom or die casting also just to roll into steel billet after Fruit storage;
Continuously cast bloom or steel billet carry out a time or multi-pass rolling after 1150-1200 DEG C of heating, and total reduction is not less than 70%; Finishing temperature is not less than 860 DEG C;
Roll rear steel plate to be greater than V
minspeed of cooling rapid water to 50 DEG C/s is chilled to 200-240 DEG C of temperature range air cooling 5-60s; Wherein V
minbe obtain martensitic Critical cooling speed, calculate according to LogVmin=2.94-0.75P, P is hardenability value, calculates according to P=2.7C+0.4Si+Mn+0.45Ni+0.8Cr+0.45Cu+2Mo.
Steel plate enters online induction heater and quickly heats up to 510-550 DEG C of tempering 15-25s with 1-10 DEG C/s, air cooling of then coming out of the stove.
Preferably, finishing temperature is 860-900 DEG C.
Preferably, roll rear steel plate and be chilled to 200-240 DEG C of temperature range air cooling 5-60s with the speed of cooling rapid water of 15-50 DEG C/s.
The present invention by suitable Composition Design, heating, controlled rolling, roll rear quick cooling and online prompt tempering, steel plate is made to realize refined crystalline strengthening, phase transformation strengthening, precipitation strength, improve the intensity of steel plate, hardness, have higher low-temperature flexibility, tissue is rendered as tempered martensite (also may contain a small amount of residual austenite) and carbide.6-25mm Plate Steel yield strength>=960MPa, unit elongation A
50>=18%, the A of-60 DEG C
kv>=50J, cold-bending property is excellent, can meet the high requirement of the industry such as automobile, engineering machinery to high tensile steel plate.The high-strength steel plate of moderate thickness adopting mentioned component design and processes control method to manufacture, possesses higher intensity, very high low-temperature flexibility, excellent cold-bending property, and user's machine-shaping is convenient.
Present invention employs suitable carbon content, suitably cheap silicon addition and Mn, add less expensive alloying elements Cr, Ni and Mo, do not add the elements such as Cu, Nb, V, B.There is obvious cost of alloy advantage, the cost of alloy of steel plate is reduced greatly.Without the need to Unhydrated cement controlled rolling in rolling, mill load can be reduced, roll the very fast cooling rate of rear employing and be chilled to rapidly 200-240 DEG C of air cooling 5-60s, steel plate enters online induction heater again and quickly heats up to 510-550 DEG C of tempering 15-25s with 1-10 DEG C/s, air cooling of then coming out of the stove.Obtain the tempered martensite of more than 90%.The present invention adopts tempering between online low-temperature short-time in addition, avoids the long-time reheating tempering of off-line, the production efficiency of steel plate is improved greatly.Cold impact value-60 DEG C of A
kv=60-100J, has obvious cost and technical superiority.
Accompanying drawing explanation
Fig. 1 is the typical gold phase constitution photo of the 6mm thickness high intensity steel plate of the embodiment of the present invention 1.
Fig. 2 is the typical gold phase constitution photo of the 25mm thickness high intensity steel plate of the embodiment of the present invention 5.
Embodiment
Below by way of being described in detail feature of the present invention and effect in conjunction with the embodiments.
For realizing the object providing more than 960MPa high tensile steel plate of the present invention, the present invention controls as follows to composition:
Carbon: the key element guaranteeing armor plate strength.Be organized as most of martensitic steel plate for obtaining, carbon is most important element, and it can significantly improve the hardening capacity of steel plate.Because carbon has higher solubleness in austenite, the stability that austenite keeps higher can be made, reduce the Ms point of steel, be beneficial to and obtain a certain amount of residual austenite.The raising of carbon content simultaneously can make intensity and hardness rise, and plasticity declines.If so steel plate should obtain high rigidity, possess certain toughness again, so carbon content must consider.For yield strength 960MPa intensity rank of the present invention, the carbon of 0.08-0.12% is suitable.Preferably, C:0.082-0.12%.
Silicon: add silicon in steel and can improve purity of steel and deoxidation.Silicon plays solution strengthening effect in steel, its solubleness in austenite is larger, improve intensity and hardness that silicone content is conducive to improving steel, row's carbon when simultaneously silicon can promote phase transformation, make to make it stable in carbon enrichment to residual austenite, coordinate roller repairing technique that the plastotype toughness of steel can be made to increase.But oxide skin viscosity when the too high meeting of silicone content makes steel plate heat is comparatively large, de-scaling difficulty after coming out of the stove, cause rolling rear surface of steel plate red oxidization skin serious, surface quality is poor.And high silicon is unfavorable for welding property.Consider the impact of silicon each side, silicone content of the present invention is 0.36-1.00%.Preferably, Si:0.5-1.0%, more preferably Si:0.4-0.97%.
Manganese: manganese stable austenite tissue, its ability is only second to alloying element nickel, and be cheap stable austenite and reinforced alloys element, manganese increases the hardening capacity of steel simultaneously, reduces the Critical cooling speed that martensite is formed.But manganese has higher segregation tendency, so its content can not be too high, in general low-carbon micro steel-alloy, Fe content is no more than 2.0%.The add-on of manganese depends primarily on the intensity rank of steel.The content of manganese of the present invention should control at 1.2-1.6%.Manganese in steel also and aluminium cooperatively play the effect of deoxidation.Preferably, Mn:1.2-1.59%.
Sulphur and phosphorus: sulphur forms plastic occluded foreignsubstance manganese sulfide with chemical combination such as manganese in steel, especially to the horizontal plastic property of steel and toughness unfavorable, therefore the content of sulphur should be low as much as possible.Phosphorus is also the harmful element in steel, the plasticity of grievous injury steel plate and toughness.For the present invention, sulphur and phosphorus are all inevitable impurity elements, should be more low better, consider the steel-making level of steel mill's reality, application claims P≤0.015%, S≤0.010%.Preferably, P≤0.01%.Preferably, S≤0.005%.
Aluminium: strong deoxidant element.Low as best one can in order to ensure the oxygen level in steel, the content of aluminium controls at 0.02-0.04%.Nitrogen element in aluminium unnecessary after deoxidation and steel can form AlN precipitate, improve intensity and when thermal treatment heat the element autstenitic grain size of energy refinement steel.Preferably, Al:0.025-0.039%.
Titanium: titanium is carbide, austenite crystal swell within reason when the N that the Ti adding trace in steel is conducive in fixing steel, the TiN of formation can make heating steel billet, refinement original austenite grains degree.Titanium also can become TiC, TiS, Ti with carbon with sulfuration symphysis respectively in steel
4c
2s
2deng, they exist with the form of inclusion and second phase particles.Titanium content of the present invention controls at 0.010-0.030%.Preferably, Ti:0.01-0.02%, more preferably Ti:0.011-0.019%.
Chromium: chromium improves the hardening capacity of steel, increases steel belt roof bolt stability.Chromium solubleness in austenite is very large, stable austenite, a large amount of solid solution in martensite after quenching, and can separate out Cr in drawing process subsequently
23c
7, Cr
7c
3in carbide, improve intensity and the hardness of steel.In order to keep the intensity rank of steel, chromium partly can replace manganese, weakens the segregation tendency of Gao Meng.The present invention can add the chromium being not more than 0.75%.Preferably, Cr:0.5-0.70%.
Nickel: the element of stable austenite, does not significantly act on raising intensity.Add nickel in steel in quenched and tempered steel, especially add the toughness especially low-temperature flexibility that nickel significantly can improve steel, simultaneously because nickel belongs to expensive alloying elements, so the present invention can add the nickel element being no more than 0.30%.Preferably, Ni:0.15-0.25%.
Molybdenum: molybdenum can crystal grain thinning significantly, improves intensity and toughness.Molybdenum can reduce steel belt roof bolt fragility, can also separate out very tiny carbide during tempering simultaneously, significantly the matrix of strengthening steel.Due to the strategic alloying element that molybdenum is very expensive, so only add the molybdenum being no more than 0.30% in the present invention.Preferably, Mo:0.15-0.25%.
Nitrogen: the present invention not containing Nb, V microalloy element, and main be main schedule of reinforcement with phase transformation strengthening and the precipitation strength of temper carbon compound.It is thick not too much that the titanium that the nitrogen being less than or equal to 60ppm content can stablize 0.01-0.03% forms the austenite crystal of slab when TiN, this TiN can ensure heating.Nitrogen content≤0.006% is controlled in the present invention, preferably, N≤0.005%.
Calcium: add calcium in the present invention and mainly change oxide morphology, improves lateral performance and the cold-bending property of steel.The steel very low for sulphur content also can not Calcium treatment.Calcium contents is less than or equal to 0.005%.Preferably, Ca≤0.002%.
Process for making is on the impact of product of the present invention:
Bessemerize and vacuum-treat: object guarantees the basal component requirement of molten steel, remove the obnoxious flavour such as oxygen, hydrogen in steel, and add the necessary alloying element such as manganese, titanium, carry out the adjustment of alloying element.
Continuous casting or die casting: ensure that all even surface quality of strand internal component is good, the steel ingot of die casting need be rolled into steel billet.
Heating and rolling: continuously cast bloom or steel billet heat at the temperature of 1150-1200 DEG C, obtain uniform austenitizing tissue on the one hand, on the other hand the compound portion of titanium, chromium etc. dissolved.Within the scope of austenite recrystallization temperature, become steel plate through a time or multi-pass rolling, total reduction is not less than 70%, and finishing temperature is not less than 860 DEG C;
Quick cooling: roll rear steel plate to be greater than V
min200-240 DEG C of temperature range is chilled to 50 DEG C/s rapid water; In quick process of cooling, most alloying element is solidly soluted in martensite.
Tempering: steel plate enters online induction heater and quickly heats up to 510-550 DEG C of tempering 15-25s with 1-10 DEG C/s, air cooling of then coming out of the stove.Tempering contributes to precipitation strength and tough type and cold-bending property are moulded in raising.
Embodiment
Embodiment 1
The molten steel smelted by table 1 proportioning carries out continuous casting or die casting after Fruit storage, slab thickness 80mm, gained blank is after 1150 DEG C of heating, through multi-pass rolling within the scope of austenite recrystallization temperature, be rolled into the steel plate that thickness is 10mm, total reduction 88%, finishing temperature is 870 DEG C, then quickly heat up to 500 DEG C of tempering 18s more online with 35 DEG C/s water-cooled to 230 DEG C, then air cooling is to room temperature.The part steel plate metallographic structure of the present embodiment as shown in Figure 1.
The further elements of embodiment 2-5 is in table 1 and technological process as embodiment 1, and processing parameter is in table 2.
The related process parameters of table 2 embodiment of the present invention 1-5 and steel plate thickness
Test example 1: mechanical property
Measure every mechanical property of embodiment of the present invention 1-5 steel plate according to GB/T228-2002 metallic substance tensile testing at ambient temperature, GB 2106-1980 metal Charpy V test method, it the results are shown in Table 3.
Test example 2: bending property
According to GB/T232-2010 bend test of metal materials method, carry out transverse cold bending d=2a to embodiment of the present invention 1-5 steel plate, 180 ° of tests, it the results are shown in Table 3, and whole embodiment steel plate is intact, all without surface crack.
The mechanical property of table 3 steel plate of the present invention and tissue
Test example 3: metallographic structure
Fig. 1 is the metallographic structure figure of the 6mm Plate Steel of the embodiment of the present invention 1.
Fig. 2 is the metallographic structure figure of the 25mm Plate Steel of the embodiment of the present invention 5.
As seen from the figure, steel plate be organized as tempered martensite+carbide, wherein, tempered martensite accounts for more than 90%.
Other embodiments also can obtain similar metallographic structure figure.
As can be seen from the above embodiments, composition of the present invention and processing parameter is adopted to process, the yield strength>=960MPa of the thick finished steel plate of 6-25mm, unit elongation A
50>=18%, the A of-60 DEG C
kv>=50J, cold-bending property is excellent, and tissue is rendered as tempered martensite and carbide.Steel plate can meet the high requirement of relevant industries to high tensile steel plate.In addition, as seen from Table 1, the carbon equivalent Ceq of steel plate of the present invention is lower, therefore has good welding property.Product of the present invention is applicable to make the industrial structure such as automobile, engineering machinery part etc., is with a wide range of applications and market outlook.
Claims (17)
1. a high tensile steel plate, the weight percent of its composition is: C:0.08-0.12%, Si:0.36-1.00%, Mn:1.2-1.6%, P≤0.015%, S≤0.010%, Al:0.02-0.04%, Ti:0.01-0.03%, N≤0.006%, Ca≤0.005%, and Cr≤0.70%, Ni≤0.30%, more than a kind in Mo≤0.30%, surplus is iron and inevitable impurity;
Described steel plate is by comprising the method manufacture of following steps:
Molten steel carries out continuous casting and becomes continuously cast bloom or die casting also just to roll into steel billet after Fruit storage;
Continuously cast bloom or steel billet carry out a time or multi-pass rolling after 1150-1200 DEG C of heating, and total reduction is not less than 70%; Finishing temperature is not less than 860 DEG C;
Roll rear steel plate to be greater than V
minspeed of cooling rapid water to 50 DEG C/s is chilled to 200-240 DEG C of temperature, air cooling 5-60s; Wherein V
minbe obtain martensitic Critical cooling speed, calculate according to LogVmin=2.94-0.75P, P is hardenability value, calculates according to P=2.7C+0.4Si+Mn+0.45Ni+0.8Cr+0.45Cu+2Mo;
Steel plate enters online induction heater and quickly heats up to 510-550 DEG C of tempering 15-25s with 1-10 DEG C/s, air cooling of then coming out of the stove.
2. high tensile steel plate as claimed in claim 1, is characterized in that, C:0.082-0.12%.
3. high tensile steel plate as claimed in claim 1, is characterized in that, Si:0.5-1.0%.
4. high tensile steel plate as claimed in claim 1, is characterized in that, Mn:1.2-1.59%.
5. high tensile steel plate as claimed in claim 1, is characterized in that, P≤0.01%.
6. high tensile steel plate as claimed in claim 1, is characterized in that, S≤0.005%.
7. high tensile steel plate as claimed in claim 1, is characterized in that, Al:0.025-0.039%.
8. high tensile steel plate as claimed in claim 1, is characterized in that, Ti:0.01-0.02%.
9. high tensile steel plate as claimed in claim 1, is characterized in that, N≤0.005%.
10. high tensile steel plate as claimed in claim 1, is characterized in that, Ca≤0.002%.
11. high tensile steel plates as claimed in claim 1, is characterized in that, Cr:0.50-0.70%.
12. high tensile steel plates as claimed in claim 1, is characterized in that, Ni:0.15-0.25%.
13. high tensile steel plates as claimed in claim 1, is characterized in that, Mo:0.15-0.25%.
14. high tensile steel plate as claimed in claim 1, it is characterized in that, finishing temperature is 860-900 DEG C.
15. high tensile steel plates as claimed in claim 1, is characterized in that, roll rear steel plate and are chilled to 200-240 DEG C of temperature range air cooling 5-60s with the speed of cooling rapid water of 15-50 DEG C/s.
16. as arbitrary in claim 1-15 as described in high tensile steel plate, it is organized as tempered martensite and carbide, and wherein more than 90% is tempered martensite.
17. as arbitrary in claim 1-15 as described in high tensile steel plate, its thickness is 6-25mm, yield strength>=960MPa, unit elongation A
50>=18%, the A of-60 DEG C
kv>=50J, excellent according to the cold-bending property of GB/T232-2010 test.
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| CN104513937A (en) * | 2014-12-19 | 2015-04-15 | 宝山钢铁股份有限公司 | High-strength steel with yield strength of 800MPa and production method thereof |
| CN104532157A (en) * | 2014-12-19 | 2015-04-22 | 宝山钢铁股份有限公司 | 900MPa-1000MPa grade (yield strength) quenched-tempered high-strength steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840724A (en) * | 2005-03-30 | 2006-10-04 | 宝山钢铁股份有限公司 | Superhigh strength steel plate with yield strength more than 960Mpa and method for producing same |
| CN101935810A (en) * | 2010-08-06 | 2011-01-05 | 莱芜钢铁股份有限公司 | Method for manufacturing low-cost super-high intensity steel plate with yield strength of over 960 MPa for wide process operation window |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840724A (en) * | 2005-03-30 | 2006-10-04 | 宝山钢铁股份有限公司 | Superhigh strength steel plate with yield strength more than 960Mpa and method for producing same |
| CN101935810A (en) * | 2010-08-06 | 2011-01-05 | 莱芜钢铁股份有限公司 | Method for manufacturing low-cost super-high intensity steel plate with yield strength of over 960 MPa for wide process operation window |
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