CN103710619B - Hot-rolled thick plate for K60-grade pipe fitting and production method thereof - Google Patents
Hot-rolled thick plate for K60-grade pipe fitting and production method thereof Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 16
- 238000005496 tempering Methods 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000010791 quenching Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 230000000171 quenching effect Effects 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
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- 238000003723 Smelting Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000002689 soil Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 238000005728 strengthening Methods 0.000 description 11
- 239000010955 niobium Substances 0.000 description 10
- 239000010936 titanium Substances 0.000 description 8
- 239000010949 copper Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000005275 alloying Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
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- 239000011733 molybdenum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- -1 wherein Mo:0 ~ 0.12% Substances 0.000 description 1
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Abstract
The invention provides a hot-rolled thick plate for K60-grade pipe fittings and a production method thereof, wherein the hot-rolled thick plate comprises the following chemical components in percentage by weight: 0.11 to 0.17 percent of C, 0.20 to 0.40 percent of Si, 1.55 to 1.80 percent of Mn, 0.01 to 0.04 percent of Nb0.008 to 0.036 percent of Ti, 0.09 to 0.13 percent of V, 0.010 to 0.045 percent of AlsN, 0.0015 to 0.0080 percent of N, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, (Nb + V + Ti) 0.12 to 0.16 percent, more than or equal to 2.5 percent of Ti/N, and less than or equal to 0.0090 percent of O + N + H. Heating temperature of a continuous casting billet is 1150-1190 ℃; the rough rolling adopts longitudinal and transverse rolling, and the total deformation is more than or equal to 50 percent; the finishing temperature range is 765-870 ℃. And the rolled steel plate is subjected to stack air cooling or stack air cooling after rapid water cooling. Quenching temperature is 850-910 ℃, and heat preservation time is 0.6-1.4 min/mm; the tempering temperature is 460-600 ℃, and the heat preservation is 0.3-0.9 min/mm. The invention can reduce the cost, and the steel plate has proper strength, low yield ratio and good toughness, and is suitable for being used as a raw material for manufacturing pipe fittings for oil and gas transmission in cold and frozen soil areas.
Description
Technical field
The invention belongs to low alloy steel production technique field, particularly relate to the good K60 level pipe fitting hot rolled heavy plate of low-temperature flexibility that a kind of long-distance oil & gas pipeline thickness specification is greater than 30mm and production method thereof.
Background technology
Along with long-distance oil & gas pipeline build flourish, the demand sustainable growth of steel for pipe; In view of the continuous deterioration of pipeline Service Environment and the increase of transfer pressure, the specification of quality of pipeline is improved constantly.Pipe fitting plays the important feature part changing direction, reinforce the effects such as strengthening in pipeline, mainly comprises threeway, four-way, taper(ed)pipe, elbow and end socket etc., need a large amount of tubing products in long distance pipeline construction.Along with the development of Long-distance pipeline industry, the requirement of steel for pipe fittings in specification, performance is day by day harsh.
In recent years, oil and gas pipes project constantly to subnival belt, tundra, the development of the ruthless area such as seismic zone, as Russia, Canada, Alaska etc.These regional pipeline service temperatures are low, easily viscous deformation occur, and therefore, the pipe fitting steel of application requires high strength, and good low-temperature flexibility and anti-flow performance.
Because pipe shape is complicated, the deflection in steel for pipe fittings moulding process is large, and deformation direction is many, generally needs by heat-treating profiled, therefore, require that steel for pipe fittings after heat treatment must have good over-all properties when making pipe fitting.
The cold-resistant K60 level pipe fitting steel in low temperate zone requires yield strength >=485MPa, tensile strength 590-717MPa, yield tensile ratio≤0.85, v-notch Charpy-V impact power >=50J at-40 DEG C, U-shaped breach Charpy-V impact power >=60J at-60 DEG C.
At present, certain progress has been had to the research of pipe fitting steel both at home and abroad.As publication number CN12021499A provides one " high-strength pipe steel and manufacture method thereof ", its X80 pipe fitting composition of steel wt% is: C0.02 ~ 0.12%, Mn1.40 ~ 2.00%, Si0.10 ~ 0.35%, P≤0.015%, S≤0.005%, Ti0.021 ~ 0.050%, Cr0.05 ~ 0.40%, Mo0.05 ~ 0.30%, Cu0.10 ~ 0.30%, Ni0.10 ~ 0.24%, N≤0.008%, Nb0.02 ~ 0.07%, V0.01 ~ 0.08%, and all the other are Fe and inevitable impurity.From content disclosed in it, add the noble elements such as more Mo, Ni, Nb, Cu in its composition, and described in it, yield tensile ratio of pipe fitting steel is too high, reaches 0.88-0.92, only can ensures-30 DEG C of ballistic works.
CN102041433A disclosed " a kind of X 70 steel plate for low-cost pipe fittings and production method thereof ", provide the X70 steel for pipe fittings of a kind of thickness 16-25mm, composition by weight percent: C0.04 ~ 0.08%, Mn1.50 ~ 1.65%, Si0.20 ~ 0.40%, P≤0.010%, S≤0.005%, (V+Nb+Ti+Mo+Ni)≤0.40%, Als≤0.050%, all the other are Fe and residual element.Carbon equivalent Ceq≤0.30%.Its made pipe fittings steel thickness is little, although roll state property energy to reach X70 level, due to C content and Ceq low, hardening capacity and the heat-treatability stabilizability of steel are low, and in moulding process, Properties Control difficulty is large.
CN102127697A provides " preparation method of a kind of X70 steel-grade bent and pipe fitting ", its X70 level bend pipe and pipe fitting composition by weight percent are: C0.09 ~ 0.15%, Mn1.25 ~ 1.75%, Si0.2% ~ 0.4%, P≤0.010%, S≤0.005%, Ca0.002 ~ 0.004%, N≤0.008%, Al0.01 ~ 0.04%, or add Nb0.03 ~ 0.10%, Ti0.02% ~ 0.06%, Cr0.15 ~ 0.50%, Mo0.15 ~ 0.45%, Ni0.15 ~ 1.0%.Although its made pipe fittings intensity meets X70 level, yield tensile ratio is all not less than 0.89, (Mo+Cr+Ni) >=0.50% in composition, and the anti-adaptability to changes of such pipe fitting is not enough, and in composition, the add-on of expensive alloying elements is large, and production cost is high.
CN102011064A disclosed " a kind of X80 grade low-temp steel for pipe fittings and Synthesis and applications thereof ", the X80 level pipe fitting composition of steel that it provides is: C0.12 ~ 0.16%, Mn1.00 ~ 1.30%, Si0.20 ~ 0.30%, P≤0.015%, S≤0.005%, Nb0.030 ~ 0.045%, Mo0.20 ~ 0.30%, Ni0.55 ~ 0.75%, Cr0.10 ~ 0.15%, Ti0.010 ~ 0.030%, B0.0005 ~ 0.0030%, all the other are Fe.It is many equally to there is the expensive alloying elements consumptions such as Mo, Ni in this patent, the problem that cost is high.
JP2011067833A discloses " a kind of pile tube high-strength electric resistance welded pipe fitting and production method thereof ", and the X70 level pipe fitting ingredient w t% provided is: C0.04 ~ 0.15%, Mn0.82 ~ 1.36%, Si0.20 ~ 0.25%, P≤0.019%, S≤0.004%, Nb≤0.042%, Ti0.005 ~ 0.015%, V≤0.040%.Product thickness is no more than 16mm, adopts resistance welding tubulation, is not suitable for as large wall thickness pipe fitting.
US2009297872A disclosed " a kind of high strength welded tube or pipe fitting and production method " thereof, provide a kind of X80 grade high-strength welded tube or pipe fitting, its ingredient w t% is: C0.02 ~ 0.10%, Si≤0.6%, Mn1.5 ~ 2.5%, Ni0.10 ~ 0.70%, Nb0.01% ~ 0.10%, Ti0.005 ~ 0.030%, Al≤0.1%, N0.001 ~ 0.006%, B≤0.0025%, Cu≤0.60%, Cr≤0.80%, Mo≤0.35%, V≤0.05%, Ca≤0.006%, Mg≤0.006%, and all the other are Fe or impurity element.Product thickness 20mm, alloying element content is more, adopts controlled rolling and controlled cooling or controlled rolling and controlled cooling+tempering mode to produce.The problems such as it is little that this patent exists product thickness equally, and production cost is high.
Summary of the invention
The present invention is intended to the deficiency solving think gauge low temperature steel for pipe fittings and production method in prior art, thus provide a kind of and be applicable to frigid zone, the K60 level pipe fitting hot-rolled thick plank of large wall thickness that Region of Oil-gas conveying in subfrigid zone uses, low yield strength ratio, high tenacity and production method thereof.
For this reason, this invention takes following solution:
A kind of K60 level pipe fitting hot-rolled thick plank, Composition Design, based on C, Mn, utilizes the strengthening effect of V in Plate Production and tubulation heat treatment process to improve plate property.Its chemical composition wt% is:
C:0.11% ~ 0.17%, Si:0.20% ~ 0.40%, Mn:1.55% ~ 1.80%, Nb:0.01% ~ 0.04%, Ti:0.008% ~ 0.036%, V:0.09% ~ 0.13%, Als:0.010% ~ 0.045%, N:0.0015% ~ 0.0080%, P≤0.015%, S≤0.005%, (Nb+V+Ti): 0.12% ~ 0.16%, Ti/N >=2.5, (O+N+H)≤0.0090%, surplus is iron and inevitable impurity.
Also containing one or both in Mo, Ni, Cu, Cr element in described chemical composition, wherein Mo:0 ~ 0.12%, Ni:0 ~ 0.15%, Cu:0 ~ 0.15%, Cr:0 ~ 0.20%, (Mo+Ni+Cu+Cr)≤0.25%.
Described chemical composition CE
iIWcontrol 0.39% ~ 0.45%, wherein CE
iIW=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
Present component design reason is:
C be in steel the most substantially, the most effective strengthening element, can interstitial solid solution be formed, carbide can also be formed with alloy element action, improve intensity, affect the formation of microtexture in steel, and hardening capacity and heat treatment stability can be increased, therefore, carbon content is unsuitable too low; But, the increase of carbon content to toughness of material and weldability unfavorable, so carbon content can not be too high.Carbon content control of the present invention is comparatively suitable 0.11% ~ 0.17%.
Si has solution strengthening effect, improves hardening capacity and tempering resistance, but its too high levels can make the plasticity of steel and toughness reduce, and weldability is worsened, easily causes cold short, optimum range is 0.20% ~ 0.40%.
Mn can reduce the lower change point of phase transformation, increases stabilization of austenite, and has solution strengthening effect, also favourable to raising hardening capacity, but Fe content is too high easily brings out segregation, and increase temper brittleness, Fe content controls 1.65% ~ 1.90% by the present invention.
Nb has obvious solution strengthening effect, can hinder grain growth, crystal grain thinning when separating out with carbonitride form, and pinning dislocation plays strengthening effect simultaneously.Niobium can also increase heat treatment stability, plays secondary hardening effect in drawing process.But content of niobium is too high can worsen welding property, promote that welding crack generates, cost also can be made obviously to increase, and it is comparatively suitable that content of niobium controls 0.01% ~ 0.04% by the present invention.
Ti effectively can fix the nitrogen element in steel, easily form carbonitride, and fusing point is high, and Ti/N >=2.5 can ensure that titanium nitride is separated out, and effectively reduces and controls nomadic nitrogen amount of element, to suppress in slab heat-processed and the growing up of crystal grain in pipe fitting welding process; But titanium content is too high has disadvantageous effect to toughness, therefore, it is comparatively suitable that titanium content controls 0.008% ~ 0.036% by the present invention.
V is solid-solution in ferrite can play obvious solution strengthening effect, improves intensity.There is during thermal treatment secondary hardening effect, increase resistance to tempering ability, performance after guarantee thermal treatment.Emphasis of the present invention uses above two kinds of characteristics of V, effectively improves the over-all properties of pipe fitting steel.In addition, V also has certain crystal grain thinning ability.And its too high levels can affect toughness and weldability.Therefore, content of vanadium controls 0.09% ~ 0.13% by the present invention.
The effective deoxidant element of Al, aluminium too high levels can make the inclusion in steel increase, and therefore, the content of dissolved aluminum controls to be advisable 0.010% ~ 0.045%.
Mo can significantly improve hardening capacity, and in promotion, cryo tissue changes, but molybdenum content is too high can increase cost, also has disadvantageous effect to weldability, therefore, should control its content below 0.12%.
Ni, Cu can play solution strengthening effect, can improve hardening capacity; Nickel can also improve plasticity and toughness.But nickel price is higher, copper too high levels can make toughness deteriorate, therefore, its content is controlled to be advisable below 0.15%.
Cr has very strong solution strengthening effect, effectively can also improve structure stability, but Cr too high levels is unfavorable to weldability, so Cr content is advisable to be no more than 0.20%.
CE of the present invention
iIWcontrol 0.39% ~ 0.45%, both can ensure the obdurability of steel plate, steel plate can be made again to have suitable weldability.
A production method for K60 level pipe fitting hot-rolled thick plank, comprise hot metal pretreatment, converter smelting, external refining, continuous casting, rolling, cooling and heating treatment technique, its concrete grammar is:
Continuously cast bloom is shove charge heating after cleaning, Heating temperature 1150 ~ 1190 DEG C, heating total time 1.1 ~ 1.8min/mm, slab soaking time 20-60min; Continuously cast bloom cleaning effectively can reduce surface imperfection, improves plate surface quality.This heating process can meet alloying element solid solution and blank temperature homogeneity in blank, effectively controls austenite grain size.
Roughing temperature range is 1000 ~ 1130 DEG C, adopts rolling mode in length and breadth, and every time deflection of rough rolling step is not less than 10%, wherein, end pass deformation is not less than 16%, and roughing total deformation is not less than 50%, and rough rolling step utilizes the abundant crystal grain thinning of austenite recrystallization; Middle temperature control plate blank thickness 2.1t ~ 3.4t, t is finished steel plate thickness, and final rolling temperature interval is 765 ~ 870 DEG C, and the finish rolling stage promotes austenite deformation and accumulates deformation energy.
Roll rear steel plate can adopt stacking air cooling or accelerate stacking air cooling after water-cooled.When adopting stacking air cooling, be 0.05 ~ 0.8 DEG C/s by controlling stacking steel billet temperature, stacking quantity and whole buttress total thickness control stacking air cooling cooling rate; When adopting stacking air cooling after quick water-cooled, quick speed of cooling is 5 ~ 15 DEG C/s, final cooling temperature 450 ~ 550 DEG C, afterwards stacking air cooling, stacking air cooling cooling rate 0.05 ~ 0.8 DEG C/s.
During thermal treatment, control quenching temperature 850 ~ 910 DEG C, soaking time 0.6 ~ 1.4min/mm, obtain the complex tissue of partial austenitizing; Quench cooling rate >=25 DEG C/s, is cooled to room temperature, obtains bainite, martensitic hard phase.Tempering temperature 460 ~ 600 DEG C, insulation 0.3 ~ 0.9min/mm, promotes precipitation strength and temper hardening, improves yield strength, reduces unrelieved stress.
Beneficial effect of the present invention is:
1, present component design is based on C, Mn, utilizes the strengthening effect of V in Plate Production and tubulation heat treatment process to improve performance; Replace or reduce the expensive alloying elements consumptions such as Mo, Ni, Nb, reducing costs.Select suitable C content and CE simultaneously
iIW, can ensure that material has good weldability.
2, the final microtexture of steel plate is duplex structure, and wherein, soft is ferrite mutually, hard based on bainite, control ferrite per-cent 20% ~ 60%, average grain size is no more than 12 μm, makes steel plate have suitable intensity, low yield strength ratio, good toughness.
3, the thickness specification of K60 level pipe fitting hot-rolled thick plank of the present invention reaches 32 ~ 60mm, yield strength reaches more than 525MPa, tensile strength 640-700MPa, yield tensile ratio≤0.85, v-notch Charpy-V impact power >=the 100J of-40 DEG C, the U-shaped breach Charpy-V impact power >=120J of-60 DEG C, is applicable to as manufacture frigid zone, tundra Region of Oil-gas conveying pipe fitting raw material.
Accompanying drawing explanation
Fig. 1 is embodiment 2 typical gold phase constitution photo;
Fig. 2 is embodiment 7 typical gold phase constitution photo.
Embodiment
The chemical composition of embodiment is in table 1.
The chemical composition wt% table of table 1 embodiment K60 level pipe fitting hot-rolled thick plank
Embodiment hot-rolled thick plank rolling technological parameter is in table 2.
Table 2 embodiment hot-rolled thick plank rolling technology process parameter table
Embodiment hot-rolled thick plank process for cooling parameter is in table 3.
Table 3 embodiment hot-rolled thick plank process for cooling parameter list
| Embodiment | The type of cooling | Speed of cooling DEG C/s | Final cooling temperature DEG C | Stacking slow cooling cooling rate DEG C/s |
| 1 | Quick water-cooled+stacking air cooling | 6 | 465 | 0.06-0.5 |
| 2 | Stacking air cooling | —— | —— | 0.1-0.7 |
| 3 | Quick water-cooled+stacking air cooling | 11 | 525 | 0.08-0.7 |
| 4 | Quick water-cooled+stacking air cooling | 13 | 510 | 0.08-0.6 |
| 5 | Stacking air cooling | —— | —— | 0.06-0.7 |
| 6 | Quick water-cooled+stacking air cooling | 8 | 480 | 0.06-0.5 |
| 7 | Quick water-cooled+stacking air cooling | 13 | 535 | 0.06-0.7 |
Embodiment hot-rolled thick plank hardening and tempering process parameter is in table 4.
Table 4 embodiment hot-rolled thick plank hardening and tempering process parameter list
| Embodiment | Quenching temperature DEG C | Quenching Soaking Time min/mm | Tempering Heating temperature DEG C | Tempering insulation time min/mm |
| 1 | 880 | 1.1 | 520 | 0.6 |
| 2 | 850 | 0.8 | 500 | 0.5 |
| 3 | 870 | 1.0 | 470 | 0.8 |
| 4 | 900 | 0.7 | 550 | 0.5 |
| 5 | 850 | 1.3 | 500 | 0.6 |
| 6 | 900 | 0.8 | 570 | 0.3 |
| 7 | 860 | 0.8 | 470 | 0.9 |
Performance after embodiment modifier treatment is in table 5.
Performance after the modifier treatment of table 5 embodiment hot-rolled thick plank
Tension specimen is φ 12.7mm circle tension specimen.
Claims (2)
1. a K60 level pipe fitting hot-rolled thick plank, is characterized in that, its chemical composition wt% is:
C:0.11% ~ 0.17%, Si:0.20% ~ 0.40%, Mn:1.55% ~ 1.80%, Nb:0.01% ~ 0.04%, Ti:0.008% ~ 0.036%, V:0.09% ~ 0.13%, Als:0.010% ~ 0.045%, N:0.0015% ~ 0.0080%, P≤0.015%, S≤0.005%, (Nb+V+Ti): 0.12% ~ 0.16%, Ti/N>=2.5, (O+N+H)≤0.0090%, also containing Mo, Ni, Cu, one or both in Cr element, wherein Mo:0 ~ 0.12%, Ni:0 ~ 0.15%, Cu:0 ~ 0.15%, Cr:0 ~ 0.20%, (Mo+Ni+Cu+Cr)≤0.25%, surplus is iron and inevitable impurity, CE
iIWcontrol 0.39% ~ 0.45%, wherein: CE
iIW=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
2. a production method for K60 level pipe fitting hot-rolled thick plank as claimed in claim 1, comprises hot metal pretreatment, converter smelting, external refining, continuous casting, rolling, cooling and heating treatment; It is characterized in that:
Continuously cast bloom is shove charge heating after cleaning, Heating temperature 1150 ~ 1190 DEG C, heating total time 1.1 ~ 1.8min/mm, soaking time 20-60min;
Roughing temperature range is 1000 ~ 1130 DEG C, adopts rolling mode in length and breadth, and every time deflection of rough rolling step is not less than 10%, and wherein, last pass deformation is not less than 16%, and roughing total deformation is not less than 50%; Middle temperature control plate blank thickness 2.1t ~ 3.4t, t is finished steel plate thickness, and final rolling temperature interval is 765 ~ 870 DEG C; Steel plate thickness specification 45 ~ 60mm;
Roll rear steel plate and adopt stacking air cooling or quick stacking air cooling after water-cooled; When adopting stacking air cooling, be 0.05 ~ 0.8 DEG C/s by controlling stacking steel billet temperature, stacking quantity and whole buttress total thickness control stacking air cooling cooling rate; When adopting stacking air cooling after quick water-cooled, quick speed of cooling is 5 ~ 15 DEG C/s, final cooling temperature 465 ~ 550 DEG C, afterwards stacking air cooling, stacking air cooling cooling rate 0.05 ~ 0.8 DEG C/s;
During thermal treatment, control quenching temperature 850 ~ 910 DEG C, soaking time 0.6 ~ 1.4min/mm; Quench cooling rate >=25 DEG C/s, is cooled to room temperature; Tempering temperature 460 ~ 600 DEG C, insulation 0.3 ~ 0.6min/mm.
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|---|---|---|---|---|
| CN109957713B (en) * | 2017-12-14 | 2020-09-01 | 鞍钢股份有限公司 | Hot rolled steel plate for ultra-wide thick-wall X80-grade pipeline and production method thereof |
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