CN105002435A - High strength-toughness corrosion-resisting steel plate and manufacturing method thereof - Google Patents
High strength-toughness corrosion-resisting steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a technical scheme of a high strength-toughness corrosion-resisting steel plate and a manufacturing method thereof. The steel plate produced by using the manufacturing method comprises the following components in percentage by weight: 0.10 to 0.13 percent of carbon (C), 0.10 to 0.30 percent of silicon (Si), 0.25 to 0.40 percent of manganese (Mn), less than or equal to 0.015 percent of phosphorus (P), less than or equal to 0.010 percent of sulphur (S), 2.30 to 2.50 percent of nickel (Ni), 1.30 to 1.50 percent of chromium (Cr), 0.28 to 0.38 percent of molybdenum (Mo), 0.010 to 0.030 percent of vanadium (V), 0.0015 to 0.0045 percent of calcium (Ca), and the balance of iron and unavoidable impurities. The tensile strength reaches above 800MPa, the lateral absorbed-energy at the temperature of minus 70 DEG C is not less than 100J, the corrosion resistance is more than 2.35 times that of plain carbon steel, and the steel plate has good high strength-toughness and corrosion resistance and excellent welding property, and can be widely applied in ocean structures, devices and the like.
Description
Technical field
The invention belongs to the technical field that metallic substance manufactures, what be specifically related to is a kind of high-strong toughness anti-corrosion steel plate and manufacture method thereof.
Background technology
Along with the enforcement of the "Oceanic" strategy, the steel plate used under ocean environment gets more and more, owing to containing chlorion (Cl in ocean environment
-), serious to Corrosion Of Steel.From marine atmosphere to abyssal temperature, change is large, and what require steel plate has good low-temperature flexibility.The structure used under ocean environment, equipment etc. are along with the progress of science and technology, and requirement of strength is more and more higher.Its high strength that what the steel plate used under ocean environment at present had can only meet or high tenacity or certain erosion resistance, cannot meet high strength, high tenacity, good erosion resistance simultaneously, can not meet the user demand under ocean environment.
Summary of the invention
Technical problem to be solved by this invention, be exactly for the deficiency existing for prior art, and a kind of high-strong toughness anti-corrosion steel plate and manufacture method thereof are provided, high-strong toughness anti-corrosion steel plate tensile strength involved in the present invention reaches more than 800MPa,-70 DEG C of transverse impact merits are not less than 100J, corrosion resistance nature is more than 2.35 times of straight carbon steel, and have good high-strong toughness and corrosion resistance nature, welding property is excellent; The manufacture method of the high-strong toughness anti-corrosion steel plate that this invention simultaneously provides, adopt converter smelting, LF+RH external refining, quenching+tempering thermal treatment etc., guarantee steel is pure, homogeneous microstructure, makes the tensile strength of steel reach more than 800MPa and is not less than 100J with-70 DEG C of transverse impact merits.
This programme is achieved by the following technical measures:
A kind of high-strong toughness anti-corrosion steel plate, its component and each compositions in weight percentage are: carbon (C) 0.10 ~ 0.13%, silicon (Si) 0.10 ~ 0.30%, manganese (Mn) 0.25 ~ 0.40%, phosphorus (P)≤0.015%, sulphur (S)≤0.010%, nickel (Ni) 2.30-2.50%, chromium (Cr) 1.30 ~ 1.50%, molybdenum (Mo) 0.28 ~ 0.38%, vanadium (V) 0.010 ~ 0.030%, calcium (Ca) 0.0015 ~ 0.0045%, surplus is iron and inevitable impurity.
A kind of high-strong toughness anti-corrosion steel plate, its preferred version is, its component and each compositions in weight percentage are: carbon (C) 0.10 ~ 0.12%, silicon (Si) 0.15 ~ 0.25%, manganese (Mn) 0.28 ~ 0.35%, phosphorus (P)≤0.012%, sulphur (S)≤0.008%, nickel (Ni) 2.35-2.45%, chromium (Cr) 1.35 ~ 1.45%, molybdenum (Mo) 0.30 ~ 0.36%, vanadium (V) 0.015 ~ 0.025%, calcium (Ca) 0.0020 ~ 0.0040%, surplus is iron and inevitable impurity.
A kind of high-strong toughness anti-corrosion steel plate, preferred embodiment is, its component and each compositions in weight percentage are: carbon (C) 0.11%, silicon (Si) 0.20%, manganese (Mn) 0.32%, phosphorus (P) 0.008%, sulphur (S) 0.001%, nickel (Ni) 2.40%, chromium (Cr) 1.40%, molybdenum (Mo) 0.33%, vanadium (V) 0.020%, calcium (Ca) 0.0030%, surplus is iron and inevitable impurity.
Produce steel plate thickness be 10-60mm.
Another object of the present invention, is the manufacture method providing a kind of high-strong toughness anti-corrosion steel plate, comprises following step: molten iron pretreatment desulfurizing, dephosphorization step, top and bottom combined blown converter smelting step, LF+RH external refining step, Calcium treatment step, sheet billet continuous casting step, slab slow cooling step, slab reheats step, dephosphorize by high pressure water step, slab rolling step, steel plate slow cooling step, heat treatment step; Described heat treated concrete steps are: steel plate quenching temperature 880 ~ 900 DEG C, soaking time 1.6 ~ 2.6min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 665 ~ 685 DEG C, soaking time 1.8 ~ 2.8min/mm, steel plate come out of the stove after air cooling.
The manufacture method of high-strong toughness anti-corrosion steel plate of the present invention, concrete steps are as follows:
Molten iron pretreatment desulfurizing, dephosphorization step, sulphur content 0.0019%-0.0032% after process, molten iron temperature 1262 DEG C-1310 DEG C;
Top and bottom combined blown converter smelting step: endpoint carbon content target is 0.06%
-0.07%, P:0.005%-0.006%, S:0.0035%-0.005%; Tapping temperature is 1622 DEG C-1632 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Molybdenum-iron, electrolytic nickel add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Add silicomanganese successively, ferrosilicon, aluminium ferromanganese, ferrochrome, vanadium iron carry out alloying, tapping process argon blowing time 17-19min;
LF refinement step: temperature of arriving at a station 1527 DEG C-1535 DEG C, out-station temperature 1656 DEG C-1661 DEG C.Heat-up time 32-34min, treatment cycle 56-58min;
RH refinement step: protect vacuum time 15-16min, vacuum tightness 0.6mbr;
Calcium treatment step: feed calcium iron wire after RH, soft blow argon 21-25min after Calcium treatment, soft blow process molten steel face is without exposed;
Sheet billet continuous casting step: pulling rate is 0.93-0.94m/min, full argon shield casting;
The chemical composition that heat analysis obtains steel plate is: C:0.10%-0.13%, Si:0.15 %-0.21%, Mn:0.27%-0.39%, P:0.009%-0.010%, S:0.001%-0.003%, Ni:2.33%-2.47%, Cr:1.34%-1.49%, Mo:0.41%-0.46%, V:0.016%-0.027%, Ca:0.0024%-0.0036%;
Slab rolls off the production line slow cooling 58h-87h;
Continuously cast bloom reheats step: heat-up time 160-205min, tapping temperature 1175-1188 DEG C;
Dephosphorize by high pressure water: slab is come out of the stove the dephosphorization of laggard horizontal high voltage water, high-pressure water pressure 20MPa;
Slab rolling step: start rolling temperature: 1133 DEG C-1145 DEG C, finishing temperature: 924 DEG C-966 DEG C; Below steel plate slow cooling to 100 DEG C;
Heat treatment step; Described heat treated concrete steps are: steel plate quenching temperature 880 ~ 900 DEG C, soaking time 1.6 ~ 2.6min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 665 ~ 685 DEG C, soaking time 1.8 ~ 2.8min/mm, steel plate come out of the stove after air cooling.
For meeting low-temperature flexibility requirement, generally by crystal grain thinning, alloying and improve the measure such as purity to improve the low-temperature flexibility of ferritic steel.In steel, add Ni, can increase the content of residual austenite, promote the formation of adverse transformation austenite, the low-temperature flexibility of matrix is improved, and Ni can also improve intensity and the solidity to corrosion of steel.C, Mn be easy segregation in steel, the homogeneity of impact tissue, therefore needs to reduce C, Mn content.Add Cr, Mo, improve the hardening capacity of steel, improve intensity and solidity to corrosion.Add appropriate V, crystal grain thinning, improve intensity.When corroding generation, Ca is dissolved in water in alkalescence, can reduce the pH value of etch front, suppresses the corrosion caused because pH value reduces to be accelerated; Ca can make steel medium sulphide content generation sex change, promotes to float, and pure steel improves toughness.
Adopt converter smelting production efficiency high, in steel, residual element are easy to control, improve yield of alloy, control alloying constituent in the scope required, need take best feed postition, joining day.Adopt external refining to reduce harmful element in steel and, as P, S, H etc., improve the purity of steel, and then improve commercial quality and the over-all properties of steel.
Steel plate heat-treats to obtain required structure and properties after rolling, and quenching+tempering can obtain high-intensity high-tenacity.
What the present invention adopted rational chemical composition design and the thermal treatment process of quenching+tempering that matches is ensures that steel plate has the prerequisite that rational microtexture and every mechanical property meet standard.Chemical composition design ensure that steel has good corrosion resistance nature and high-intensity high-tenacity, rational thermal treatment process can ensure that steel plate has uniform microtexture, thus ensure that steel plate has the indexs such as good normal tensile property, low-temperature flexibility, ensure steel plate safety in utilization.
Beneficial effect of the present invention is:
Can learn according to describing of such scheme, high-strong toughness anti-corrosion steel plate, tensile strength reaches more than 800MPa,-70 DEG C of transverse impact merits are not less than 100J, corrosion resistance nature is more than 2.35 times of straight carbon steel, have good high-strong toughness and corrosion resistance nature, welding property is excellent, is widely used in ocean structure, equipment etc.
Embodiment
For technical characterstic of the present invention can be clearly demonstrated, below by embodiment, this programme is set forth.
Embodiment 1: the thickness producing steel plate is 10mm.
Molten iron pretreatment desulfurizing, dephosphorization, sulphur content 0.0028% after process, molten iron temperature 1262 DEG C;
Converter smelting: endpoint carbon content target is 0.07%, P:0.005%, S:0.005%.Tapping temperature is 1622 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Molybdenum-iron, electrolytic nickel add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Add silicomanganese successively, ferrosilicon, aluminium ferromanganese, ferrochrome, vanadium iron carry out alloying, tapping process argon blowing time 17min;
LF refining: temperature of arriving at a station 1530 DEG C, out-station temperature 1656 DEG C.Heat-up time 33min, treatment cycle 58min.
RH refining: protect vacuum time 16min, vacuum tightness 0.6mbr.
Calcium treatment step: feed calcium iron wire after RH, soft blow argon 21min after Calcium treatment, soft blow process molten steel face is without exposed;
Continuous casting: pulling rate is 0.93m/min, full argon shield casting;
The chemical composition that heat analysis obtains steel plate is: C:0.10%, Si:0.16%, Mn:0.27%, P:0.009%, S:0.001%, Ni:2.33%, Cr:1.44%, Mo:0.41%, V:0.016%, Ca:0.0024%;
Slab rolls off the production line slow cooling 58h.
Continuously cast bloom reheats: heat-up time 160min, tapping temperature 1188 DEG C.
Dephosphorize by high pressure water: slab is come out of the stove the dephosphorization of laggard horizontal high voltage water, high-pressure water pressure 20MPa;
Start rolling temperature: 1145 DEG C, finishing temperature: 924 DEG C; Below steel plate slow cooling to 100 DEG C;
Steel plate quenching+tempering process: quenching temperature 889 DEG C, soaking time 1.8min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 678 DEG C, soaking time 2.5min/mm, steel plate come out of the stove after air cooling.
Embodiment 2: the steel plate thickness involved by the present embodiment is 30mm.
Molten iron pretreatment desulfurizing, dephosphorization, sulphur content 0.0032% after process, molten iron temperature 1268 DEG C;
Converter smelting: endpoint carbon content target is 0.06%, P:0.006%, S:0.004%.Tapping temperature is 1625 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Molybdenum-iron, electrolytic nickel add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Add silicomanganese successively, ferrosilicon, aluminium ferromanganese, ferrochrome, vanadium iron carry out alloying, tapping process argon blowing time 19min;
LF refining: temperature of arriving at a station 1535 DEG C, out-station temperature 1660 DEG C.Heat-up time 32min, treatment cycle 56min.
RH refining: protect vacuum time 15min, vacuum tightness 0.6mbr.Feed calcium iron wire after RH, soft blow argon 25min after Calcium treatment, soft blow process molten steel face is without exposed;
Continuous casting: pulling rate is 0.98m/min, full argon shield casting;
The chemical composition that heat analysis obtains steel plate is: C:0.12%, Si:0.21%, Mn:0.33%, P:0.010%, S:0.003%, Ni:2.42%, Cr:1.34%, Mo:0.45%, V:0.027%, Ca:0.0036%;
Slab rolls off the production line slow cooling 63h.
Continuously cast bloom reheats step: heat-up time 173min, tapping temperature 1175 DEG C.
Dephosphorize by high pressure water: slab is come out of the stove the dephosphorization of laggard horizontal high voltage water, high-pressure water pressure 20MPa;
Start rolling temperature: 1133 DEG C, finishing temperature: 959 DEG C; Below steel plate slow cooling to 100 DEG C;
Steel plate quenching+tempering process: quenching temperature 895 DEG C, soaking time 2.5min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 669 DEG C, soaking time 2.0min/mm, steel plate come out of the stove after air cooling.
Embodiment 3: the steel plate thickness involved by the present embodiment is 58mm.
Molten iron pretreatment desulfurizing, dephosphorization, sulphur content 0.0019% after process, molten iron temperature 1310 DEG C;
Converter smelting: endpoint carbon content target is 0.07%, P:0.006%, S:0.0035%.Tapping temperature is 1632 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Molybdenum-iron, electrolytic nickel add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Add silicomanganese successively, ferrosilicon, aluminium ferromanganese, ferrochrome, vanadium iron carry out alloying, tapping process argon blowing time 17 minutes;
LF refining: temperature of arriving at a station 1527 DEG C, out-station temperature 1661 DEG C.Heat-up time 34min, treatment cycle 58min.
RH refining: protect vacuum time 16min, vacuum tightness 0.6mbr.Feed calcium iron wire after RH, soft blow argon 23min after Calcium treatment, soft blow process molten steel face is without exposed;
Continuous casting: pulling rate is 0.94m/min, full argon shield casting;
The chemical composition that heat analysis obtains steel plate is: C:0.13%, Si:0.15 %, Mn:0.39%, P:0.010%, S:0.002%, Ni:2.47%, Cr:1.49%, Mo:0.46%, V:0.023%, Ca:0.0029%;
Slab rolls off the production line slow cooling 87h.
Continuously cast bloom reheats: heat-up time 205min, tapping temperature 1175 DEG C.
Dephosphorize by high pressure water: slab is come out of the stove the dephosphorization of laggard horizontal high voltage water, high-pressure water pressure 20MPa;
Start rolling temperature: 1133 DEG C, finishing temperature: 966 DEG C; Below steel plate slow cooling to 100 DEG C;
Steel plate quenching+tempering process: quenching temperature 884 DEG C, soaking time 2.1min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 673 DEG C, soaking time 1.9min/mm, steel plate come out of the stove after air cooling.
Normal tensile property is as shown in table 1.
Table 1 steel plate normal tensile property
Low temperature impact test: carry out horizontal low temperature impact test at-70 DEG C, shock test adopts v-notch, and Impulse Test Result is as shown in table 3.
Table 2 steel plate-70 DEG C of V-type transverse impact test-results
Corrosion test adopts artificial accelerated exposure testing, and neutral salt spray test is carried out, specimen size 100 × 50 × 4mm with reference to GB/T 10125-1997 " artificial atmosphere corrosion test salt-fog test ", and Duplicate Samples often plants material 3.Test conditions: 0.5% NaCl, 35 ± 1 DEG C; Spray pattern: spray 15min, stop-spraying 45min, continue 8h; Be incubated 35 ± 1 DEG C of Primordial Qi atmosphere 16 h, totally 24 h are a cycle.This work respectively gets one group of (3) sample measurement erosion rate, its result table 3 in the 64th cycle, the 102nd cycle, the 128th cycle respectively.
Table 3 corrosion test result
The present invention can pass through existing techniques in realizing without the technical characteristic described, and does not repeat them here.Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (9)
1. a high-strong toughness anti-corrosion steel plate, its component and each compositions in weight percentage are: carbon (C) 0.10 ~ 0.13%, silicon (Si) 0.10 ~ 0.30%, manganese (Mn) 0.25 ~ 0.40%, phosphorus (P)≤0.015%, sulphur (S)≤0.010%, nickel (Ni) 2.30-2.50%, chromium (Cr) 1.30 ~ 1.50%, molybdenum (Mo) 0.28 ~ 0.38%, vanadium (V) 0.010 ~ 0.030%, calcium (Ca) 0.0015 ~ 0.0045%, surplus is iron and inevitable impurity.
2. high-strong toughness anti-corrosion steel plate according to claim 1, it is characterized in that: its component and each compositions in weight percentage are: carbon (C) 0.10 ~ 0.12%, silicon (Si) 0.15 ~ 0.25%, manganese (Mn) 0.28 ~ 0.35%, phosphorus (P)≤0.012%, sulphur (S)≤0.008%, nickel (Ni) 2.35-2.45%, chromium (Cr) 1.35 ~ 1.45%, molybdenum (Mo) 0.30 ~ 0.36%, vanadium (V) 0.015 ~ 0.025%, calcium (Ca) 0.0020 ~ 0.0040%, surplus is iron and inevitable impurity.
3. high-strong toughness anti-corrosion steel plate according to claim 2, it is characterized in that: its component and each compositions in weight percentage are: carbon (C) 0.11%, silicon (Si) 0.20%, manganese (Mn) 0.32%, phosphorus (P) 0.008%, sulphur (S) 0.001%, nickel (Ni) 2.40%, chromium (Cr) 1.40%, molybdenum (Mo) 0.33%, vanadium (V) 0.020%, calcium (Ca) 0.0030%, surplus is iron and inevitable impurity.
4. the high-strong toughness anti-corrosion steel plate according to the arbitrary claim of claim 1-3, the thickness of described steel plate is 10-60mm.
5. the manufacture method of a high-strong toughness anti-corrosion steel plate, comprise following step: molten iron pretreatment desulfurizing, dephosphorization step, top and bottom combined blown converter smelting step, LF+RH external refining step, Calcium treatment step, sheet billet continuous casting step, slab slow cooling step, slab reheats step, dephosphorize by high pressure water step, slab rolling step, steel plate slow cooling step, heat treatment step; Described heat treated concrete steps are: steel plate quenching temperature 880 ~ 900 DEG C, soaking time 1.6 ~ 2.6min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 665 ~ 685 DEG C, soaking time 1.8 ~ 2.8min/mm, steel plate come out of the stove after air cooling.
6. the manufacture method of high-strong toughness anti-corrosion steel plate according to claim 5, concrete steps are as follows:
Molten iron pretreatment desulfurizing, dephosphorization step, sulphur content 0.0019%-0.0032% after process, molten iron temperature 1262 DEG C-1310 DEG C;
Top and bottom combined blown converter smelting step: endpoint carbon content target is 0.06%
-0.07%, P:0.005%-0.006%, S:0.0035%-0.005%; Tapping temperature is 1622 DEG C-1632 DEG C; Adopt the two slag-stopping tapping of floating plug, scum rod; Molybdenum-iron, electrolytic nickel add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime, fluorite make top slag; Add silicomanganese successively, ferrosilicon, aluminium ferromanganese, ferrochrome, vanadium iron carry out alloying, tapping process argon blowing time 17-19min;
LF refinement step: temperature of arriving at a station 1527 DEG C-1535 DEG C, out-station temperature 1656 DEG C-1661 DEG C;
Heat-up time 32-34min, treatment cycle 56-58min;
RH refinement step: protect vacuum time 15-16min, vacuum tightness 0.6mbr;
Calcium treatment step: feed calcium iron wire after RH, soft blow argon 21-25min after Calcium treatment, soft blow process molten steel face is without exposed;
Sheet billet continuous casting step: pulling rate is 0.93-0.94m/min, full argon shield casting;
The chemical composition that heat analysis obtains steel plate is: C:0.10%-0.13%, Si:0.15 %-0.21%, Mn:0.27%-0.39%, P:0.009%-0.010%, S:0.001%-0.003%, Ni:2.33%-2.47%, Cr:1.34%-1.49%, Mo:0.41%-0.46%, V:0.016%-0.027%, Ca:0.0024%-0.0036%;
Slab rolls off the production line slow cooling 58h-87h;
Continuously cast bloom reheats step: heat-up time 160-205min, tapping temperature 1175-1188 DEG C;
Dephosphorize by high pressure water: slab is come out of the stove the dephosphorization of laggard horizontal high voltage water, high-pressure water pressure 20MPa;
Slab rolling step: start rolling temperature: 1133 DEG C-1145 DEG C, finishing temperature: 924 DEG C-966 DEG C; Below steel plate slow cooling to 100 DEG C;
Described heat treated concrete steps are: steel plate quenching temperature 880 ~ 900 DEG C, soaking time 1.6 ~ 2.6min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 665 ~ 685 DEG C, soaking time 1.8 ~ 2.8min/mm, steel plate come out of the stove after air cooling.
7. the manufacture method of high-strong toughness anti-corrosion steel plate according to claim 6, described heat treated concrete steps are: steel plate quenching+tempering process: quenching temperature 889 DEG C, soaking time 1.8min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 678 DEG C, soaking time 2.5min/mm, steel plate come out of the stove after air cooling.
8. the manufacture method of high-strong toughness anti-corrosion steel plate according to claim 6, described heat treated concrete steps are: steel plate quenching+tempering process: quenching temperature 895 DEG C, soaking time 2.5min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 669 DEG C, soaking time 2.0min/mm, steel plate come out of the stove after air cooling.
9. the manufacture method of high-strong toughness anti-corrosion steel plate according to claim 6, described heat treated concrete steps are: steel plate quenching+tempering process: quenching temperature 884 DEG C, soaking time 2.1min/mm, steel plate come out of the stove after rapid water be chilled to room temperature, steel plate tempering temperature 673 DEG C, soaking time 1.9min/mm, steel plate come out of the stove after air cooling.
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| CN113933234A (en) * | 2021-12-15 | 2022-01-14 | 西南石油大学 | Evaluation method for gathering and transportation pipeline material selection |
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