CN102277530A - Pipeline steel with thickness more than or equal to 25mm for deep sea and production method thereof - Google Patents
Pipeline steel with thickness more than or equal to 25mm for deep sea and production method thereof Download PDFInfo
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Abstract
The invention relates to a pipeline steel for deep sea and a production method thereof. The pipeline steel for deep sea comprises the following components in percentage by weight: 0.025-0.080% of C, 0.05-0.50% of Si, 1.20-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, 0.05-0.30% of Mo, 0.03-0.06% of Nb, 0.005-0.025% of Ti, 0.01-0.04% of Al, less than or equal to 0.010% of N and 0.0010-0.0050% of Ca used as main components, and less than or equal to 0.03% of As, less than or equal to 0.01% of Sb, less than or equal to 0.02% of Sn, less than or equal to 0.01% of Pb, less than or equal to 0.01% of Bi and less than or equal to 0.0005% of B used as residual elements. The production method comprises the following production steps: smelting according to clean steel, and carrying out continuous casting to obtain a blank; heating the cast blank; carrying out rough rolling; carrying out fine rolling; relaxing; cooling; relaxing again; straightening; and carrying out air cooling to room temperature. The pipeline steel has simple ingredient and technology, the thickness of the pipeline steel is more than or equal to 25mm, and the pipeline steel is used for deep sea pipelines. The Rt05 of the pipeline steel is more than or equal to 450MPa, Rm is more than or equal to 550MPa, Rt05/Rm is less than or equal to 0.85, A50mm is more than or equal to 40%, Agt is more than or equal to 10%, -40DEG C KV2 is more than or equal to 200J, and -20DEG C DWTT (Drop-Weight Tear Test) SA is more than or equal to 85%.
Description
Technical field
The present invention relates to pipeline steel and production method, specifically belong to deep-sea pipe line steel and production method thereof.
Background technology
With the progressively exhaustion of landing field hydrocarbon resources, new resource exploitation extends to the abominable area of geologic conditions such as ocean, polar region.At present, verify the world ocean petroleum resources and accounted for 34% of world petroleum resource total amount, and the annual production of ocean natural gas also reaches 32% of global Sweet natural gas gross annual output amount, existing more than 100 countries in the whole world are carrying out offshore oil exploration, wherein over half petroleum prospecting has been carried out at the deep-sea, therefore, the subsea pipeline steel, especially the importance of the development and application of deep-sea pipeline steel highlights day by day.At present, domestic subsea pipeline is with the main dependence on import of steel.
Before patent of the present invention, number of patent application is that 200810151232 Chinese invention patent " high-strength high-ductility X 70 thick-wall seamless pipeline steel and manufacture method " and number of patent application are that 200710113424 Chinese invention patent " a kind of micro-alloying steel for oil gas transport seamless pipeline and manufacture method thereof " has been set forth and adopted weldless steel tube to carry the method for land or sea-bottom oil-gas, but the size deviation of big specification weldless steel tube is big, resource is few and price is high, is not suitable for the selection of deep-sea pipeline steel.
Number of patent application is 200710052601 Chinese invention patent " a kind of steel plate and manufacture method thereof that is used to make subsea pipeline " and article " the subsea pipeline Application and Development of steel " (welded tube .2006,29 (5): 36-39) set forth the method that adopts hot continuous rolling opening plate making subsea pipeline steel plate, the mode of production of the hot continuous rolling opening plate that it adopted can only be produced the thick neritic region subsea pipeline steel plate of thickness≤20mm, can not be used to produce thick specification (〉=25mm) deep-sea subsea pipeline steel, and need out flat behind the hot continuous rolling, cut, production process is longer.
Article " Japanese high-strength line-pipe steel production general introduction " (welded tube .32 (3): 64-69), " Recent steel technology of high-grade line pipe for critical application " (2010 Chinese international pipeline forum collections of thesis: 52-63), " current situation of high grade pipe line steel " (iron and steel .41 (10): 1-10) introduced the SUMITOMO CHEMICAL metal company in the research and development and the applicable cases of big wall thickness subsea pipeline aspect steel, but all do not announce its concrete composition and production technique, and all do not list the pipeline steel essential tear resistance that drops hammer in deep-sea in the mechanical property, can't determine whether it can satisfy the technical qualification requirement of existing pipelines in deep sea engineering strictness.
In recent years, along with the ocean energy resources development of resources progressively strides forward to the pelagic realm, the degree of depth of undersea pipe-laying improves constantly.The pelagic realm constantly increases with the thickness of subsea pipeline steel, and is more and more harsher to the requirement of its crush resistance, low temperature crack initiation and aspects such as arrest toughness, deformability.Especially, along with the increase of pipe line steel thickness, its low temperature arrest toughness (DWTT) becomes the technical indicator of most critical, development difficulty maximum.In addition, along with the continuous rising of pipe line steel intensity, the performance requriements that satisfy pelagic realm subsea pipeline steel low yield strength ratio, gross distortion ability also becomes new challenge.At present, still find no high strength (R
T0.5〉=450MPa), low temperature arrest toughness excellence (20 ℃ of DWTT SA 〉=85%), low yield strength ratio (R
T0.5/ R
m≤ 0.85), high uniform elongation (A
Gt〉=10%), satisfies the report of existing pelagic realm with the Pipeline Steel Development success of thick specification subsea pipeline steel technical qualification requirement.
Summary of the invention
The objective of the invention is for overcome the subsea pipeline described in the above-mentioned document with steel production cost height, size deviation is big, production process is complicated, performance is difficult to satisfy deficiencies such as the deep-sea pipeline steel requires, and a kind of yield strength R is provided
T0.5〉=450MPa ,-40 ℃ of KV
2〉=200J ,-20 ℃ of DWTT SA 〉=85%, and yield tensile ratio R
T0.5/ R
m≤ 0.85, unit elongation A
50mm〉=40%, uniform elongation A
GtPipe line steel and production method thereof that 〉=10% deep-sea usefulness 〉=25mm is thick.
Realize the technical measures of above-mentioned purpose:
The pipe line steel that deep-sea usefulness 〉=25mm is thick, its main ingredient and weight percent are: C:0.025～0.080%, Si:0.05～0.50%, Mn:1.20～1.60%, P :≤0.015%, S≤0.003%, Mo:0.05～0.30%, Nb:0.03～0.06%, Ti:0.005～0.025%, Al:0.01～0.04%, N :≤0.010%, Ca:0.0010～0.0050%, the weight percent of residual element control is: As≤0.03%, Sb≤0.01%, Sn≤0.02%, Pb≤0.01%, Bi≤0.01%, B≤0.0005, all the other are Fe and other unavoidable impurities; Simultaneously, also must satisfy following formula:
Welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.22%;
Nb％+V％+Ti％≤0.12。
It is characterized in that: also be added with weight percent and be≤0.30% Ni.
It is characterized in that: also be added with weight percent and be≤0.30% Cr.
It is characterized in that: also be added with weight percent and be≤0.08% Cu.
It is characterized in that: also be added with weight percent and be≤0.05% V.
The method of the pipe line steel that production deep-sea usefulness 〉=25mm is thick, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1120～1230 ℃;
3) carry out roughing, controlling its start rolling temperature is 1050～1180 ℃, and end temp is 980～1040 ℃, and controls every time draft 10～30%;
4) carry out finish rolling, control its start rolling temperature at 850～950 ℃, finishing temperature is at 780～840 ℃, and the accumulative total draft is 65～75%;
5) carry out relaxation, the time is 20～60s;
6) cool off, control begins to cool down temperature at 710～790 ℃, and final cooling temperature is at 350～530 ℃, and speed of cooling is controlled at 15～50 ℃/s;
7) relaxation 40～60s once more;
8) align, control aligning inlet draught is at 1～3mm;
9) air cooling is to room temperature, and is stand-by.
The effect of each element and mechanism are as follows among the present invention:
Carbon (C) content is 0.025～0.080%, adds a certain amount of carbon, can significantly improve the intensity of steel and the yield tensile ratio of reduction steel, but carbon content surpasses at 0.080% o'clock, and the low-temperature flexibility of steel significantly worsens, thereby carbon content is defined as 0.025～0.080%.
Silicon (Si) content is 0.05～0.50%, mainly plays the solution strengthening effect, avoids simultaneously causing the moulding of steel, toughness significantly to worsen because of adding excess silicon.
Manganese (Mn) content is 1.20～1.60%, adds higher economic alloy element manganese, can significantly improve the intensity of steel, in addition, manganese is crystal grain thinning to a certain extent, improves the impelling strength of steel, but excessive manganese easily forms poly-partially, the composition and the tissue odds that cause steel.
Niobium (Nb) content is 0.03～0.06%, and niobium can significantly improve the austenite recrystallization temperature of steel, enlarges non-recrystallization district scope, be convenient to realize the high temperature controlled rolling, reduce mill load, the while niobium can also suppress austenite crystal grows up, and has significant refined crystalline strengthening and precipitation strength effect.But in high strength bainite steel, add the generation that excessive niobium can promote the M-A island, reduce the toughness of welded heat affecting zone, therefore, the content of niobium is defined as 0.03～0.06%.
Vanadium (V) content is 0～0.05%, and vanadium can replenish the deficiency of niobium precipitation strength, can also improve the postwelding toughness of steel to a certain extent.But because vanadium has stronger precipitation strength and more weak refined crystalline strengthening effect, add excessive vanadium and easily cause the ductile-brittle transition temperature of steel to improve, therefore the content with vanadium is controlled at lower contents level: 0～0.05%.
Titanium (Ti) content is 0.005～0.025%, the effect in steel of titanium and niobium is similar, stronger refined crystalline strengthening and precipitation strength effect are arranged, the titanium of trace can also at high temperature combine with carbon, oxygen, form high temperature infusible precipitate, the austenite crystal that helps suppressing welded heat affecting zone is grown up, and significantly improves the toughness of welded heat affecting zone.
Molybdenum (Mo) content is 0.05～0.30%, molybdenum is significantly postponed γ → α and is changed, suppress ferrite and perlite forming core, promotion has the formation of the bainite/acicular ferrite of high density dislocation substructure, make steel in rolling the cooling rate scope of a back broad, obtain bainite/acicular ferrite structure, but molybdenum belongs to noble metal, and the add-on increase can significantly improve the manufacturing cost of steel, and too high molybdenum also can cause the low-temperature flexibility of steel to worsen simultaneously.
Nickel (Ni) content is 0～0.30%, and nickel can effectively improve the hardening capacity of steel, has certain solution strengthening effect, can also significantly improve the low-temperature flexibility of steel.In addition, the check crack that nickel can also effectively stop the red brittleness of Cu to cause, and significantly improve the corrosion resistance nature of steel.But nickel and molybdenum are similar, belong to noble metal, easily cause the manufacturing cost of steel significantly to improve, and in addition, too high nickel content easily causes the steel plate iron scale to be difficult to remove, and causes the plate surface quality problem.
The content of chromium (Cr) is 0～0.30%, and chromium also is the hardening capacity element that improves steel, and has certain solution strengthening effect, in addition, adds weather-proof, corrosion resistance nature that certain chromium can also improve steel.
The content of aluminium (Al) is 0.01～0.04%, and aluminium is deoxidant element main in the steel, can significantly reduce the oxygen level in the steel, and aluminium forms AlN, crystal grain thinning effectively with combining of nitrogen simultaneously.But aluminium content surpasses at 0.04% o'clock in the steel, easily causes the oxide inclusion of aluminium obviously to increase, and reduces the cleanliness factor of steel, and is unfavorable to the low-temperature flexibility of steel.
The content of calcium (Ca) is 0.0010～0.0050%, in the secondary refining process steel is carried out calcium and handles, and can improve the inclusion morphology in the steel, significantly improves the transverse impact toughness of steel.
Phosphorus (P), sulphur (S), nitrogen (N) content are respectively: [%P]≤0.015, [%S]≤0.0030, [%N]≤0.010.Therefore phosphorus easily causes the cold short of steel, and sulphur easily causes hot-short, and nitrogen easily causes the quench aging and the strain ageing of steel, causes the unstable properties of steel, should reduce the content of phosphorus in the steel, sulphur, nitrogen as far as possible.
Copper (Cu), arsenic (As), antimony (Sb), plumbous (Pb), bismuth (Bi) content are: [%Cu]≤0.08, [%As]≤0.03, [%Sb]≤0.01, [%Sn]≤0.02, [%Pb]≤0.01, [%Bi]≤0.01.For improving the purity of steel, guarantee that the deep-sea pipeline steel has excellent low-temperature flexibility, the content of low melting points such as necessary strict control copper, arsenic, antimony, lead, bismuth, harmful element.
Welding cold crack sensitivity FACTOR P cm≤0.22% has good welding property to guarantee steel.
The present invention compared with prior art, adopt the composition design and the easier production technique of less expensive, can significantly reduce the high production cost of weldless steel tube, also can avoid adopting the flat complicated production operation of the hot rolling of hot continuous rolling opening plate+open, and, test-results shows, it is by component and content and technology controlling and process, can obtain the two-phase or the polyphase structure of ideal proeutectoid ferrite+bainite (+a small amount of M-A constituent element), can realize thick specification (〉=25mm) the desired excellence of deep-sea line pipe line steel plate is strong, mould, the toughness coupling, the yield strength (R of steel plate
T0.5〉=450MPa), tensile strength (R
m) 〉=550MPa, yield tensile ratio (R
T0.5/ R
m)≤0.85, unit elongation (A
50mm) 〉=40%, uniform elongation (A
Gt) 〉=10% ,-40 ℃ of KV
2〉=200J ,-20 ℃ of DWTT SA 〉=85%.
Embodiment
Below the invention will be further described:
Embodiment 1
The deep-sea thick pipe line steel of 28mm, its component and weight percent are: C:0.025%, Si:0.50%, Mn:1.60%, P:0.014%, S:0.0020%, Ni:0.01%, Mo:0.30%, Cr:0.05%, Cu:0.03%, Nb:0.031%, V:0.004%, Ti:0.01%, Al:0.011%, N:0.009%, Ca:0.0034%, the weight percent of residual element control is: As:0.008%, Sb:0.001%, Sn:0.002%, Pb:0.001%, Bi:0.003%, B:0.0001%, surplus is Fe and other unavoidable impurities;
Welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B=0.147%;
Nb：0.031％+V：0.004％+Ti：0.010％＝0.045％。
The production deep-sea method of the thick pipe line steel of 28mm, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1120～1125 ℃;
3) carry out roughing, controlling its start rolling temperature is 1075～1180 ℃, and end temp is 980～985 ℃, and controls every time draft 10～17%;
4) carry out finish rolling, control its start rolling temperature at 850～855 ℃, finishing temperature is at 780～785 ℃, and the accumulative total draft is 72%;
5) carry out relaxation, the time is 20s;
6) cool off, control begins to cool down temperature at 755～760 ℃, and final cooling temperature is at 436～440 ℃, and speed of cooling is controlled at 18.6 ℃/s;
7) relaxation 40s once more;
8) align, control aligning inlet draught is at 3mm;
9) air cooling is to room temperature, and is stand-by.
Embodiment 2
The deep-sea thick pipe line steel of 25.4mm, its component and weight percent are: C:0.040%, Si:0.32%, Mn:1.52%, P:0.012%, S:0.0025%, Ni:0.07%, Mo:0.05%, Cr:0.22%, Cu:0.02%, Nb:0.040%, V:0.01%, Ti:0.007%, Al:0.021%, N:0.0070%, Ca:0.0048%, the weight percent of residual element control is: As:0.009%, Sb:0.001%, Sn:0.001%, Pb:0.0007%, Bi:0.004%, B:0.0001%, surplus is Fe and other unavoidable impurities;
Welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B=0.145%.
Nb：0.040％+V：0.01％+Ti：0.007％＝0.057％。
The production deep-sea method of the thick pipe line steel of 25.4mm, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1145～1150 ℃;
3) carry out roughing, controlling its start rolling temperature is 1110～1115 ℃, and end temp is 1005～1010 ℃, and controls every time draft 13～20%;
4) carry out finish rolling, control its start rolling temperature at 915～920 ℃, finishing temperature is at 805～810 ℃, and the accumulative total draft is 73%;
5) carry out relaxation, the time is 35s;
6) cool off, control begins to cool down temperature at 762～767 ℃, and final cooling temperature is at 465～470 ℃, and speed of cooling is controlled at 35 ℃/s;
7) relaxation 48s once more;
8) align, control aligning inlet draught is at 1.5mm;
9) air cooling is to room temperature, and is stand-by.
Embodiment 3
The deep-sea thick pipe line steel of 27mm, its component and weight percent are: C:0.048%, Si:0.25%, Mn:1.37%, P:0.010%, S:0.0011%, Ni:0%, Mo:0.07%, Cr:0.28%, Cu:0.05%, Nb:0.058%, V:0.003%, Ti:0.015%, Al:0.032%, N:0.006%, Ca:0.0025%, the weight percent of residual element control is: As:0.008%, Sb:0.0008%, Sn:0.0006%, Pb:0.0009%, Bi:0.003%, B:0.0001%, surplus is Fe and other unavoidable impurities;
Welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B=0.147%;
Nb：0.058％+V：0.003％+Ti：0.015％＝0.076％。
The production deep-sea method of the thick pipe line steel of 27mm, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1225～1230 ℃;
3) carry out roughing, controlling its start rolling temperature is 1165～1170 ℃, and end temp is 1035～1040 ℃, and controls every time draft 14～23%;
4) carry out finish rolling, control its start rolling temperature at 945～950 ℃, finishing temperature is at 835～840 ℃, and the accumulative total draft is 75%;
5) carry out relaxation, the time is 44s;
6) cool off, control begins to cool down temperature at 785～790 ℃, and final cooling temperature is at 405～410 ℃, and speed of cooling is controlled at 28 ℃/s;
7) relaxation 53s once more;
8) align, control aligning inlet draught is at 2.6mm;
9) air cooling is to room temperature, and is stand-by.
Embodiment 4
The deep-sea thick pipe line steel of 31.8mm, its component and weight percent are: C:0.063%, Si:0.15%, Mn:1.45%, P:0.011%, S:0.0015%, Ni:0.13%, Mo:0.05%, Cr:0.16%, Cu:0%, Nb:0.031%, V:0.027%, Ti:0.018%, Al:0.039%, N:0.0050%, Ca:0.0021%, the weight percent of residual element control is: As:0.007%, Sb:0.0007%, Sn:0.0005%, Pb:0.0011%, Bi:0.002%, B:0.0001%, surplus is Fe and other unavoidable impurities;
Welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B=0.159%;
Nb：0.031％+V：0.027％+Ti：0.018％＝0.076％。
The production deep-sea method of the thick pipe line steel of 31.8mm, its step:
1) smelting also according to Clean Steel technology, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1192～1197 ℃;
3) carry out roughing, controlling its start rolling temperature is 1150～1155 ℃, and end temp is 1025～1030 ℃, and controls every time draft 14～25%;
4) carry out finish rolling, control its start rolling temperature at 902～908 ℃, finishing temperature is at 820～825 ℃, and the accumulative total draft is 68%;
5) carry out relaxation, the time is 59s;
6) cool off, control begins to cool down temperature at 730～735 ℃, and final cooling temperature is at 425～430 ℃, and speed of cooling is controlled at 15 ℃/s;
7) relaxation 36s once more;
8) align, control aligning inlet draught is at 1.4mm;
9) air cooling is to room temperature, and is stand-by.
Embodiment 5
The deep-sea thick pipe line steel of 30.2mm, its component and weight percent are: C:0.08%, Si:0.10%, Mn:1.22%, P:0.007%, S:0.0005%, Ni:0.09%, Mo:0.16%, Cr:0%, Cu:0.07%, Nb:0.035%, V:0%, Ti:0.024%, Al:0.024%, N:0.0040%, Ca:0.0014%, the weight percent of residual element control is: As:0.008%, Sb:0.0009%, Sn:0.0007%, Pb:0.0014%, Bi:0.004%, B:0.0001%, surplus is Fe and other unavoidable impurities;
Welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B=0.184%;
Nb：0.035％+V：0.048％+Ti：0.024％＝0.107％。
The production deep-sea method of the thick pipe line steel of 30.2mm, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1183～1189 ℃;
3) carry out roughing, controlling its start rolling temperature is 1142～1148 ℃, and end temp is 1015～1020 ℃, and controls every time draft 15～28%;
4) carry out finish rolling, control its start rolling temperature at 878～883 ℃, finishing temperature is at 800～805 ℃, and the accumulative total draft is 65%;
5) carry out relaxation, the time is 60s;
6) cool off, control begins to cool down temperature at 710～715 ℃, and final cooling temperature is at 351～358 ℃, and speed of cooling is controlled at 30 ℃/s;
7) relaxation 40s once more;
8) align, control aligning inlet draught is at 1.2mm;
9) air cooling is to room temperature, and is stand-by.
Table 1 is the Performance Detection cartogram of each embodiment.
The Performance Detection cartogram of each embodiment of table 1
Claims (6)
1. the thick pipe line steel of deep-sea usefulness 〉=25mm, its main ingredient and weight percent are: C:0.025～0.080%, Si:0.05～0.50%, Mn:1.20～1.60%, P :≤0.015%, S≤0.003%, Mo:0.05～0.30%, Nb:0.03～0.06%, Ti:0.005～0.025%, Al:0.01～0.04%, N :≤0.010%, Ca:0.0010～0.0050%, the weight percent of residual element control is: As≤0.03%, Sb≤0.01%, Sn≤0.02%, Pb≤0.01%, Bi≤0.01%, B≤0.0005, all the other are Fe and other unavoidable impurities; Simultaneously, also must satisfy following formula: welding cold crack sensitivity FACTOR P cm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.22%; Nb%+V%+Ti%≤0.12.
2. the thick pipe line steel of deep-sea usefulness 〉=25mm as claimed in claim 1 is characterized in that: also be added with weight percent and be≤0.30% Ni.
3. the thick pipe line steel of deep-sea usefulness 〉=25mm as claimed in claim 1 is characterized in that: also be added with weight percent and be≤0.30% Cr.
4. the thick pipe line steel of deep-sea usefulness 〉=25mm as claimed in claim 1 is characterized in that: also be added with weight percent and be≤0.08% Cu.
5. the thick pipe line steel of deep-sea usefulness 〉=25mm as claimed in claim 1 is characterized in that: also be added with weight percent and be≤0.05% V.
6. the method for the pipe line steel that the described deep-sea usefulness 〉=25mm of production claim 1 is thick, its step:
1) smelting also according to clean steel process, continuous casting becomes base;
2) to the continuously cast bloom heating, controlling its Heating temperature is 1120～1230 ℃;
3) carry out roughing, controlling its start rolling temperature is 1050～1180 ℃, and end temp is 980～1040 ℃, and controls every time draft 10～30%;
4) carry out finish rolling, control its start rolling temperature at 850～950 ℃, finishing temperature is at 780～840 ℃, and the accumulative total draft is 65～75%;
5) carry out relaxation, the time is 20～60s;
6) cool off, control begins to cool down temperature at 710～790 ℃, stops cooling temperature at 350～530 ℃, and speed of cooling is controlled at 15～50 ℃/s;
7) relaxation 40～60s once more;
8) align, control aligning inlet draught is at 1～3mm;
9) air cooling is to room temperature, and is stand-by.
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| CN104357766A (en) * | 2014-11-24 | 2015-02-18 | 武汉钢铁(集团)公司 | Extremely-thick high-strength high-toughness seabed pipeline steel for ultra-deep sea and manufacturing method of extremely-thick high-strength high-toughness seabed pipeline steel |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |