CN104451446A - Thick-gauge, high-strength and high-toughness bainite engineering steel and production method thereof - Google Patents
Thick-gauge, high-strength and high-toughness bainite engineering steel and production method thereof Download PDFInfo
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Abstract
The invention discloses thick-gauge, high-strength and high-toughness bainite engineering steel and a production method thereof. The thick-gauge, high-strength and high-toughness bainite engineering steel is prepared from the following raw materials: 0.03%-0.05% of C, 0.10%-0.30% of Si, 1.60%-1.80% of Mn, 0.04%-0.06% of Nb, 0.01%-0.020% of Ti, 0.10%-0.20% of Mo, 0.10%-0.40% of Ni, 0.10%-0.30% of Cr, no more than 0.20% of Cu, no more than 0.010% of P, no more than 0.0015% of S, no more than 0.012% of As, and the balance of iron and inevitable impurities, wherein the yield strength is greater than or equal to 555MPa; the tensile strength is greater than or equal to 630MPa; A50 is greater than or equal to 40%; KV2 at -20 DEG C is greater than or equal to 350J; and drop hammer SA% at -15 DEG C is greater than or equal to 80%. Compared with the prior art, the preparation method has the advantages that the thickness of the steel plate is greater than or equal to 34mm; thermal treatment is not required, so that the production process is simplified; the yield is increased; the production cost is reduced; and meanwhile, the construction cost of a delivery pipeline can be significantly reduced.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of think gauge high-strong toughness bainite engineering steel and production method thereof.
Background technology
Along with the adjustment of China's energy structure and the reinforcement of environment protection dynamics, be the inexorable trend of 21 century development using oil and gas Substitute coal as main energy sources.In addition, along with the quick growth of home consumption amount, China also plans from Russian inlet part oil and natural gas.
Consider from China's production of hydrocarbons and consumption structure and strategy to develop western regions, long distance, heavy caliber, high pressure are the inexorable trends that China's oil and gas pipes develops, and this just has higher requirement to the intensity of pipe line steel and toughness.First the grade of steel improving pipe line steel is required.Often improve a grade of steel, construction cost about 7% can be saved.In recent years, worldwide pipework is all to use X70 pipe line steel, X80 also batch be used in pipeline construction, and the pipe line steel of X100 and more Hi-grade steel is also in exploitation and popularization on probation.Secondly, while stepping up to develop senior pipe line steel, focus on improving steel toughness, take into account high strength and the high tenacity of material.
But up to the present, the steel plate thickness for pipe line steel is most of below 30 millimeters, and as thickened more than 34 millimeters, then prior art or complex process, namely will through Overheating Treatment, or be difficult to make the properties of steel plate all to meet the demands.
Through retrieval: China Patent Publication No. is the patent documentation of CN101684539A, it discloses a kind of component and weight percent is C:0.03 ~ 0.06%, Mn:1.55 ~ 1.75%, Si:0.15 ~ 0.25%, S≤0.003%, P≤0.012 ~ 0.020%, Cu:0.20 ~ 0.35%, Cr:0.20 ~ 0.35%, Nb:0.06 ~ 0.08%, T:0.01 ~ 0.02%, Als≤0.05%, Mo:0.20 ~ 0.30%, all the other are iron and inevitable impurity, but the X70 coils of hot-rolled steel of what it obtained is thickness >=14mm, not hot-rolled steel sheet.
China Patent Publication No. is the patent documentation of CN101992213A, its disclose a kind of component and weight percent be C:0.04 ~ 0.07%, Mn:1.50 ~ 1.68%, Si:0.10 ~ 0.20%, S≤0.003%, P≤0.015%,
Nb：0.04～0.08％、Ti：0.006～0.018％、Mo：0.05～0.30％、Als≤0.05％、N≤0.006％、Ni≤0.20％、Cu≤0.25％。Its line steel hot rolling roll bending for top layer compact grained X65 and X70 rank finally obtained, its thickness specification is 13 ~ 20mm, is similarly roll bending.
China Patent Publication No. is the patent documentation of CN102172619A, it discloses a kind of hot rolling technology that can improve Hi-grade steel think gauge pipe line steel fracture toughness property, its steel grade related to is X70 and X80 hot-rolled coil, thickness range is >=15mm, and the thickness specification that example relates to is 15.9mm, 17.5mm and 18.4mm.
Summary of the invention
The object of the invention is to provide a kind of steel plate thickness to be greater than 34 millimeters, and its mechanical property is: yield strength>=555MPa, tensile strength>=630MPa, A
50>=35.0% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer, metallographic structure is bainite, without the need to the engineering steel of heat-treating and production method thereof.
For achieving the above object, adopt technical scheme as follows:
A kind of think gauge high-strong toughness bainite engineering steel, its component and weight percent content are: C:0.03 ~ 0.05%, Si:0.10 ~ 0.30%, Mn:1.60 ~ 1.80%, Nb:0.04 ~ 0.06%, Ti:0.01 ~ 0.020%, Mo:0.10 ~ 0.20%, Ni:0.10 ~ 0.40%, Cr:0.10 ~ 0.30%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity; Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
A kind of think gauge high-strong toughness bainite engineering steel, its component and weight percent content are: C:0.035 ~ 0.045%, Si:0.18 ~ 0.26%, Mn:1.65 ~ 1.75%, Nb:0.043 ~ 0.056%, Ti:0.013 ~ 0.018%, Mo:0.12 ~ 0.18%, Ni:0.20 ~ 0.30%, Cr:0.18 ~ 0.25%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity; Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
A kind of think gauge high-strong toughness bainite engineering steel, its component and weight percent content are: C:0.048%, Si:0.18%, Mn:1.65%, Nb:0.06%, Ti:0.010%, Mo:0.1%, Ni:0.18%, Cr:0.18%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity; Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
The production method of above-mentioned think gauge high-strong toughness bainite engineering steel, comprises the following steps:
1) converter smelting continuous casting become the slab of thickness 290-400mm;
2) strand is heated to 1150 ~ 1200 DEG C;
3) segmentation rolling: in roughing section, control roughing start rolling temperature 1080 ~ 1140 DEG C, the draft controlling last two passages is not less than 20%, and the draft of all the other rolling passes is not less than 15%, and ensures that the total reduction of roughing section is not less than 60%; In the finish rolling stage, control finish rolling start rolling temperature 850 ~ 900 DEG C, and control last twice and have the draft carrying passage to be respectively not less than 15%; Finishing temperature control is at 820 ~ 850 DEG C;
4) cool: steel plate open cold temperature at 760 ~ 800 DEG C, and be cooled to 200 ~ 350 DEG C with 30 ~ 40 DEG C/sec of speed of cooling; Steel plate after controlled cooling model obtains thickness and is greater than 34mm high-strong toughness bainite engineering steel.
A preparation method for think gauge high-strong toughness bainite engineering steel, its component and weight percent content are: C:0.048%, Si:0.18%, Mn:1.65%, Nb:0.06%, Ti:0.010%, Mo:0.1%, Ni:0.18%, Cr:0.18%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity;
1) converter smelting continuous casting become the slab of thickness 400mm;
2) strand is heated to 1158 DEG C;
3) segmentation rolling: in roughing section, control roughing start rolling temperature 1080 DEG C, control the draft 24% of last two passages, the draft of all the other rolling passes is not less than 15%, and ensures that the total reduction of roughing section is not less than 60%; In the finish rolling stage, control finish rolling start rolling temperature 890 DEG C, and control the draft 16% that last twice have year passage; Finishing temperature control is at 840 DEG C;
4) cool: steel plate open cold temperature at 792 DEG C, and be cooled to 200 ~ 350 DEG C with 36 DEG C/sec of speed of cooling; Steel plate after controlled cooling model obtains thickness and is greater than 34mm high-strong toughness bainite engineering steel.
The effect of each component and main technique and the reason of control in the present invention:
C: carbon is strengthening element most economical, the most basic in steel, solution strengthening and precipitation strength have obvious effect to the intensity improving steel plate, but improve carbon and have negative impact to the ductility of steel, toughness and weldability, therefore, the evolution of pipe line steel is the process constantly reducing carbon content.Carbon content control of the present invention is 0.03 ~ 0.05%.To ensure the block hammer performance requirement of the impact property requirement that steel plate is higher and superelevation.
Mn: the lower change point reducing steel, increases the condensate depression of austenite cooling, refine pearlite tissue, and improves its mechanical property, can significantly improve the hardening capacity of steel, but has the unfavorable trend increasing grain fineness number alligatoring and temper brittleness.Manganese element can improve the intensity of steel, but during content height, will reduce the low-temperature flexibility of steel.
Nb: niobium is one of topmost element in microalloying pipe line steel, fairly obvious to the effect of grain refining.Niobium can significantly improve the austenite recrystallization temperature of steel, expands Unhydrated cement scope, is convenient to realize high temperature rolling.Niobium can also suppress Austenite Grain Growth, has refined crystalline strengthening and precipitation strength effect significantly.But in high strength bainite steel, add the formation that excessive niobium can impel M-A island, reduce the toughness of welded heat affecting zone.
Ti: titanium is strong N element, Austenite Grain Growth when tiny TiN particle can effectively stop slab to reheat, contributes to improving the solid solubility of Nb in austenite, can also improve the impelling strength of welded heat affecting zone simultaneously.
Mo: molybdenum significantly postpones austenite to ferritic transformation, suppresses the formation of ferrite and pearlite, promotes the formation with the bainite/acicular ferrite of high density dislocation substructure.Make steel can obtain bainite/acicular ferrite structure within the scope of a wider speed of cooling after rolling.But excessive molybdenum can cause the low-temperature flexibility of steel to worsen, and molybdenum belongs to noble metal, and add-on increase can significantly improve the manufacturing cost of steel.
Ni: nickel effectively can improve the hardening capacity of steel, there is certain solution strengthening effect, significantly can also improve the low-temperature flexibility of steel, as long as Ni adds the red brittleness improved Cu and easily cause at steel grade, and it is favourable to toughness, can also compensate in think gauge pipe line steel cause because of the increase of thickness strength degradation, but, too high nickel content easily causes steel-plate iron oxide scale to be difficult to removing, cause plate surface quality problem, and nickel belongs to noble metal, add-on increase can significantly improve the manufacturing cost of steel.
Cu: the intensity improving steel by solution strengthening effect, meanwhile, copper improves the solidity to corrosion of steel, but copper is unfavorable to welding property.
Cr: chromium improves intensity by solution strengthening and grain refining.
P: phosphoric increases temper brittleness and cold short susceptibility.
S: element sulphur increases the red brittleness of steel, during sulphur content height, unfavorable to welding property.
As: arsenic is the harmful element in steel, is inevitable element in steel, and belongs to the impurity cannot removed by steel-making means, when content is more than 0.015%, the toughness of steel is sharply declined.Therefore, high-quality ore deposit need be selected when joining ore deposit.
Generally speaking the feature of chemical composition is low-carbon (LC), Gao Meng, the alloying element such as microalloy element, a small amount of Mo, Ni, Cr such as Nb, Ti containing trace, strictly must control impurity content, ensure the purity of molten steel.
In the present invention, following technique is controlled:
Why control roughing start rolling temperature 1080 ~ 1140 DEG C, being to ensure that large pressure at high temperature carried out by steel plate, making crystal grain fully broken.
The draft why controlling last two passages of rough rolling step is not less than 20%, is in order to steel plate is when close to non-recrystallization temperature, ensures that austenite crystal is fully broken, suppresses excessively growing up of crystal grain simultaneously;
Why control the finish rolling start rolling temperature 850 ~ 900 DEG C of steel plate, be finishing temperature in order to ensure steel plate and open cold temperature.
The draft controlling last two passages of finish rolling is not less than 13% respectively, is to ensure the abundant refinement of the crystal grain of steel plate before undergoing phase transition.
Cold temperature opened by control steel plate is 760 ~ 800 DEG C, is that part austenitic transformation is proeutectoid ferrite in steel plate, ensures the tissue obtaining full bainite.Ensure high strength and the high tenacity of steel plate.
Compared with prior art, steel plate thickness is thicker >=34mm in the present invention.Owing to there being block hammer performance requirement, there is tubulation process in pipe line steel, therefore, the thickness of steel plate is general all at below 30mm, and steel plate is thicker, and tubulation process is more difficult, and block hammer performance is more difficult to meet the demands.The present invention breaks through thickness restriction, alloy formula simple (such as Nb, Mo content is lower, and Cu can add and can not add), reduce production cost, be simultaneously feature with low-carbon (LC), under the prerequisite ensureing armor plate strength, improve impelling strength, fracture toughness property and good welding property.In hot rolling technology provided by the invention compared with prior art, prior art is all the two stage total reductions of setting, the present invention sets the draft of finish rolling and last two passages of roughing especially, does not increase operation, and for the steel plate of think gauge, increase draft not affect steel-plate shape, easy operation, productivity is high, the product yield strength>=555MPa of acquisition, tensile strength>=630MPa, A
50>=35.0% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer, without the need to heat-treating thus simplifying production process, improve productive rate, and reduce production cost.Significantly can reduce the construction cost of line of pipes simultaneously.
Accompanying drawing explanation
Accompanying drawing 1: embodiment 3 metallographic structure (500*).
Embodiment
Following examples explain technical scheme of the present invention further, but not as limiting the scope of the invention.
Think gauge high-strong toughness bainite engineering steel of the present invention, its component and weight percent content are: C:0.03 ~ 0.05%, Si:0.10 ~ 0.30%, Mn:1.60 ~ 1.80%, Nb:0.04 ~ 0.06%, Ti:0.01 ~ 0.020%, Mo:0.10 ~ 0.20%, Ni:0.10 ~ 0.40%, Cr:0.10 ~ 0.30%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity.
Preparation process is as follows:
1) converter smelting continuous casting become the slab of thickness 290-400mm;
2) strand is heated to 1150 ~ 1200 DEG C;
3) segmentation rolling: in roughing section, control roughing start rolling temperature 1080 ~ 1140 DEG C, the draft controlling last two passages is not less than 20%, and the draft of all the other rolling passes is not less than 15%, and ensures that the total reduction of roughing section is not less than 60%; In the finish rolling stage, control finish rolling start rolling temperature 850 ~ 900 DEG C, and control last twice and have the draft carrying passage to be respectively not less than 15%; Finishing temperature control is at 820 ~ 850 DEG C;
4) cool: steel plate open cold temperature at 760 ~ 800 DEG C, and be cooled to 200 ~ 350 DEG C with 30 ~ 40 DEG C/sec of speed of cooling; Steel plate after controlled cooling model obtains thickness and is greater than 34mm high-strong toughness bainite engineering steel.
Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
The chemical composition (wt%) of table 1 various embodiments of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Contrast 1 | Contrast 2 |
| Slab thickness mm | 290 | 303 | 400 | 298 | 300 | 300 | 300 | 300 | 250 | 300 |
| Slab heating temperature DEG C | 1162 | 1150 | 1158 | 1190 | 1182 | 1178 | 1185 | 1169 | 1148 | 1220 |
| Roughing start rolling temperature DEG C | 1110 | 1108 | 1080 | 1095 | 1087 | 1140 | 1123 | 1134 | 1117 | 1114 |
| The draft % of last two passages | 20 | 22 | 24 | 22 | 20 | 25 | 23 | 24 | 10 | 15 |
| Finish rolling start rolling temperature DEG C | 895 | 880 | 890 | 895 | 885 | 850 | 900 | 865 | 910 | 920 |
| The draft % of last two passages | 15 | 16 | 16 | 16 | 17 | 17 | 16 | 16 | 10 | 11 |
| Finishing temperature DEG C | 830 | 821 | 840 | 832 | 841 | 850 | 832 | 840 | 860 | 872 |
| Open cold temperature DEG C | 770 | 762 | 792 | 788 | 790 | 800 | 791 | 793 | 790 | 792 |
| Speed cooling DEG C/S | 32 | 37 | 36 | 30 | 34 | 40 | 33 | 35 | 20 | 22 |
| Product thickness mm | 34.0 | 34.3 | 35.0 | 35.2 | 36.6 | 36.0 | 34.6 | 35.8 | 35.0 | 36.6 |
The results of property list of table 3 various embodiments of the present invention and comparative example
As can be seen from table 1,2,3: adopt identical component system, different sotck thinknesses, the draft of different finish rolling and last two passages of roughing, produce steel plate stretching, to drop hammer and impact property exists obvious difference.Adopt the steel plate that the mode of the application is produced, thickness range is 34.0 ~ 36.6mm, has superior tensile performance, has higher impelling strength and fracture toughness property simultaneously.As can be seen from metallograph (shown in accompanying drawing 1): adopt this technique to obtain full bainite structure, grain fineness number reaches 12 grades.In bainite, crack propagation is engaged consumingly each other, the obstruction of the tiny bar bundle of the distribution that intermeshes, thus effectively improves its obdurability.
Claims (5)
1. a think gauge high-strong toughness bainite engineering steel, is characterized in that component and weight percent content are: C:0.03 ~ 0.05%, Si:0.10 ~ 0.30%, Mn:1.60 ~ 1.80%, Nb:0.04 ~ 0.06%, Ti:0.01 ~ 0.020%, Mo:0.10 ~ 0.20%, Ni:0.10 ~ 0.40%, Cr:0.10 ~ 0.30%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity; Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
2. a think gauge high-strong toughness bainite engineering steel, is characterized in that component and weight percent content are: C:0.035 ~ 0.045%, Si:0.18 ~ 0.26%, Mn:1.65 ~ 1.75%, Nb:0.043 ~ 0.056%, Ti:0.013 ~ 0.018%, Mo:0.12 ~ 0.18%, Ni:0.20 ~ 0.30%, Cr:0.18 ~ 0.25%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity; Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
3. a think gauge high-strong toughness bainite engineering steel, is characterized in that component and weight percent content are: C:0.048%, Si:0.18%, Mn:1.65%, Nb:0.06%, Ti:0.010%, Mo:0.1%, Ni:0.18%, Cr:0.18%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity; Its yield strength>=555MPa, tensile strength>=630MPa, A
50>=40% ,-20 DEG C of KV
2>=350J ,-15 DEG C of SA%>=80% that drop hammer.
4. the production method of think gauge high-strong toughness bainite engineering steel described in any one of claim 1-3, comprises the following steps:
1) converter smelting continuous casting become the slab of thickness 290-400mm;
2) strand is heated to 1150 ~ 1200 DEG C;
3) segmentation rolling: in roughing section, control roughing start rolling temperature 1080 ~ 1140 DEG C, the draft controlling last two passages is not less than 20%, and the draft of all the other rolling passes is not less than 15%, and ensures that the total reduction of roughing section is not less than 60%; In the finish rolling stage, control finish rolling start rolling temperature 850 ~ 900 DEG C, and control last twice and have the draft carrying passage to be respectively not less than 15%; Finishing temperature control is at 820 ~ 850 DEG C;
4) cool: steel plate open cold temperature at 760 ~ 800 DEG C, and be cooled to 200 ~ 350 DEG C with 30 ~ 40 DEG C/sec of speed of cooling; Steel plate after controlled cooling model obtains thickness and is greater than 34mm high-strong toughness bainite engineering steel.
5. a preparation method for think gauge high-strong toughness bainite engineering steel, is characterized in that component and weight percent content are: C:0.048%, Si:0.18%, Mn:1.65%, Nb:0.06%, Ti:0.010%, Mo:0.1%, Ni:0.18%, Cr:0.18%, Cu≤0.20%, P≤0.010%, S≤0.0015%, As≤0.012% all the other be iron and inevitable impurity;
1) converter smelting continuous casting become the slab of thickness 400mm;
2) strand is heated to 1158 DEG C;
3) segmentation rolling: in roughing section, control roughing start rolling temperature 1080 DEG C, control the draft 24% of last two passages, the draft of all the other rolling passes is not less than 15%, and ensures that the total reduction of roughing section is not less than 60%; In the finish rolling stage, control finish rolling start rolling temperature 890 DEG C, and control the draft 16% that last twice have year passage; Finishing temperature control is at 840 DEG C;
4) cool: steel plate open cold temperature at 792 DEG C, and be cooled to 200 ~ 350 DEG C with 36 DEG C/sec of speed of cooling; Steel plate after controlled cooling model obtains thickness and is greater than 34mm high-strong toughness bainite engineering steel.
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| CN110387510A (en) * | 2019-08-15 | 2019-10-29 | 武汉钢铁有限公司 | For reducing the F type rail and preparation method thereof of magnetic-levitation train frictional dissipation |
| CN111690801A (en) * | 2020-05-25 | 2020-09-22 | 中天钢铁集团有限公司 | Production process of alloy tool steel wire rod for obtaining full bainite structure |
| CN112375997A (en) * | 2020-10-10 | 2021-02-19 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions |
| WO2021109439A1 (en) * | 2019-12-07 | 2021-06-10 | 江阴兴澄特种钢铁有限公司 | Hic-resistant and large deformation-resistant pipeline steel and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112375997A (en) * | 2020-10-10 | 2021-02-19 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions |
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| CN104451446B (en) | 2017-01-25 |
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