CN105154789B - A kind of deep-sea high-performance marine riser steel and production method - Google Patents
A kind of deep-sea high-performance marine riser steel and production method Download PDFInfo
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Abstract
A kind of deep-sea high-performance marine riser steel, its chemical composition and wt% are：C：0.020~0.045%, Si：0.10 ~ 0.30%, Mn：1.00~1.80%, P：≤ 0.012%, S≤0.0020%, Cu：0.95~1.40%, Cr：0~0.30%, Ni：0.70~1.50%, Mo：0.10 ~ 0.30%, Nb：0.035~0.060%, Ti：0.010~0.025%, Al：0.010~0.050%, N：≤ 0.008%；Production stage：Heated after being casting continuously to form base；Roughing；Finish rolling；Cooling；Aligning；Heat treatment.The present invention can obtain preferable fine grain tempered sorbite tissue along thickness of slab direction, realize excellent strong, modeling, tough and fatigue behaviour matched well, the yield strength R of steel plate required by the think gauge high-performance water proof tube steel of deep-seat0.5>=555MPa, tensile strength Rm>=625MPa, 50 DEG C of KV2>=200J, 30 DEG C of DWTT SA >=85%.
Description
Technical field
The present invention relates to a kind of pipeline steel and production method, a kind of water proof tube steel and production method are specifically belonged to,
Definite is one kind suitable for deep more than the 1500 meters deep-sea high-performance marine riser steel in sea and production method.
Background technology
With the progressively exhausted of landing field petroleum resources, new resource exploitation is to the severe ground of the geological conditions such as ocean, polar region
Area extends.At present, world ocean petroleum resources account for world petroleum resource total amount 34% has been verified, and the annual output of ocean natural gas
Amount also reaches the 32% of global natural gas gross annual output amount, and existing more than 100 countries in the whole world are carrying out offshore oil exploration, wherein one
More than half has carried out oil exploration to deep-sea, ultra-deep sea marine site, therefore, marine oil and gas exploitation steel, especially deep-sea, ultra-deep sea
The importance of the development and application of marine site seabed tube steel is increasingly highlighted.
In deep-sea, ultra-deep sea marine site, marine riser needs to bear high external seawater pressure and delivered inside pressure,
Also need to bear subsea cryogenic ocean current, whirlpool simultaneously and the frequent impact caused to marine riser such as swash, it is therefore desirable to the water proof for being used
There is effective steel raw material resistance to compression high to burst ability, high intensity, excellent low-temperature flexibility and fatigue behaviour.With steel plate thickness
Increase, it is ensured that there is excellent low temperature fracture toughness and good structure property uniformity to turn into stern challenge for it.
Through retrieval：Chinese Patent Application No. is the document of CN201110179840.5, it discloses a kind of " inexpensive property high
Energy marine riser hot rolled steel plate and its production method ", it uses low C, Mn high, Nb, Cr, Cu, Ni, Mo etc. is added on a small quantity and is closed
The composition design of gold element, with reference to the manufacture method of TMCP technique productions low cost water proof tube steel.In the document due to Cu,
The alloy contents such as Cr, Ni, Mo are low, and using cooling controlling and rolling controlling process production, make production thickness, the thickness direction structure property of steel plate
Uniformity, low-temperature flexibility and fatigue behaviour be difficult to ensure that the stabilization that cause cannot meet deep-sea think gauge water proof tube steel makes
With requiring.
Chinese Patent Application No. is the document of CN201310478765.1, it discloses " a kind of anti-fatigue performance is excellent
High intensity marine riser is responsible for and its manufacture method ", it uses low C, Mn high, and the alloys such as Nb, V, Cu, Ni, Cr, Mo unit is added in right amount
The composition design of element, and microscopic structure is acicular ferrite+Bainite complex microstructure.The document is due to using conventional land pipeline
With the composition design and manufacture method of X80 pipe line steels, it is not enough identical with CN201110179840.5 documents that it is present, i.e. steel plate
Production thickness, the structure property uniformity of thickness direction, low-temperature flexibility and fatigue behaviour be difficult to ensure that, it is impossible to meet deep-sea use
The stable use requirement of think gauge water proof tube steel.
Chinese Patent Application No. for CN201410666155.9 document, disclose " a kind of high-performance marine riser sheet material and
Production method ", it uses low C, low Mn, and Cu high, Ni high, Cr high add the composition design of the alloying elements such as Mo, Nb, knot in right amount
Close controlled rolling+intercritical hardening+high tempering production method, the document due to for Cu high, Ni high, Cr high composition design,
Make quenching degree too strong, and due also to using the intercritical hardening mode of production, be also easy to produce the hardened structure for being difficult to eliminate, and cause intensity
It is too high and low-temperature flexibility is not enough, therefore it is unsuitable for the production of deep-sea high-intensity high-tenacity water proof tube steel.
The content of the invention
The invention aims to the quenching degree deficiency, the freezing crack that overcome above-mentioned existing water proof tube steel technology to exist
Toughness, structure property uniformity are difficult to reach the deficiencies such as requirement, the use requirement for being difficult to meet deep-sea think gauge marine riser, and
A kind of thickness is provided in more than 25.4mm, yield strength Rt0.5>=555MPa, tensile strength Rm≥625MPa、-50℃ KV2≥
200J, -30 DEG C of deep-seas of DWTT SA >=85% high-performance marine riser steel and production methods.
Realize the measure of above-mentioned purpose：
A kind of deep-sea high-performance marine riser steel, the percentage by weight of its chemical composition is：C：0.020~0.045%,
Si：0.10 ~ 0.30%, Mn：1.00~1.80%, P：≤ 0.012%, S≤0.0020%, Cu：0.95~1.40%, Cr：0~
0.30%th, Ni：0.70~1.50%, Mo：0.10 ~ 0.30%, Nb：0.035~0.060%, Ti：0.010~0.025%, Al：
0.010~0.050%, N：≤ 0.008%, remaining is Fe and inevitable impurity；Thickness is in more than 25.4mm, yield strength
Rt0.5>=555MPa, tensile strength Rm≥625MPa、-50℃ KV2>=200J, -30 DEG C of DWTT SA >=85%.
A kind of deep-sea production method of high-performance marine riser steel, its step：
1）After routine is smelted and is casting continuously to form base, to heating strand, heating-up temperature is 1150~1250 DEG C；
2）Roughing is carried out, at 1050~1200 DEG C, single pass reduction ratio is not less than 10%, accumulation pressure to control roughing temperature
Rate is not less than 60%；
3）Finish rolling is carried out, at 780~900 DEG C, finish rolling accumulation reduction ratio is not less than 60% to control final rolling temperature；
4）Cooled down, control cooldown rate is in 10~30 DEG C/s, final cooling temperature≤300 DEG C；
5）Aligned, it is advanced run 40~60s of Henan after align again, aligning entrance drafts≤3mm；
6）It is heat-treated, control hardening heat is at 880-950 DEG C；Quenching Soaking Time is according to 1.0 ~ 1.5 times of steel plates
Thickness gauge, Quenching Soaking Time unit is min, and steel plate thickness unit is mm；Control temperature at 600 ~ 720 DEG C, protect by tempering
The warm time according to 1.0 ~ 2.0 times of steel plate thickness gauge, tempering insulation time unit be min, steel plate thickness unit be mm.
The mechanism of action of each element is as follows in the present invention：
Carbon（C）Content is 0.020~0.045%, adds a certain amount of carbon, can significantly improve the intensity of steel, but right
Deep-sea high-performance water proof tube steel, to ensure excellent low-temperature flexibility, the center segregation of anti-blocking strictly controls carbon content
Below 0.045%.
Silicon（Si）Content is 0.10~0.30%, and silicon mainly plays solution strengthening effect in steel, but to deep-sea think gauge
Water proof tube steel, it is necessary to be the low-temperature flexibility for ensureing welding heat affected zone using compared with Large Heat Input Welding, in should strictly controlling steel
Silicone content, reduce Silicate Inclusions content in steel, it is to avoid the excessive formation of M-A constituent elements.
Manganese（Mn）Content is 1.00~1.80%, adds economic alloy element manganese higher, can significantly improve steel
Intensity, additionally, manganese can also crystal grain thinning to a certain extent, improve the impact flexibility of steel, but think gauge marine riser is used
Steel, excessive manganese easily forms center segregation, causes composition, tissue and the performance of steel uneven.
Niobium（Nb）Content is 0.035~0.060%, and niobium can significantly improve the austenite recrystallization temperature of steel, is expanded not
Recrystallization zone scope, is easy to implement high temperature controlled rolling, reduces mill load, while niobium can also suppress Austenite Grain Growth, tool
There are significant refined crystalline strengthening and precipitation strength to act on.But in high strength bainite steel, the niobium of excessive addition can promote M-A islands
Generation, reduce welding heat affected zone toughness, therefore, the content of niobium is defined to 0.030~0.065%.
Titanium（Ti）Content be 0.010~0.025%, effect of the titanium with niobium in steel is similar, have stronger refined crystalline strengthening with
Precipitation strength is acted on, and micro titanium can also be combined with carbon, oxygen at high temperature, forms the precipitate of high temperature refractory, is conducive to suppression
The Austenite Grain Growth of welding heat affected zone processed, significantly improves the toughness of welding heat affected zone.
Molybdenum（Mo）Content is 0.10~0.30%, and molybdenum significantly postpones γ → α transformations, suppresses ferrite and pearlite forming core,
Promote the formation of the bainite/acicular ferrite with high density dislocation substructure so that steel is rolling latter cooling rate wider
In the range of obtain bainite/acicular ferrite structure, additionally, molybdenum also advantageously improves the having stable high-temperature performance property of steel, but molybdenum belongs to
In precious metal, addition increase can significantly improve the manufacturing cost of steel, while too high molybdenum also results in the low-temperature flexibility of steel
Deteriorate.
Nickel（Ni）Content is 0.70~1.50%, and nickel can effectively improve the quenching degree of steel, with certain solution strengthening
Effect, moreover it is possible to significantly improve the low-temperature flexibility of steel.Additionally, nickel can also effectively prevent the check crack that the red brittleness of Cu causes, and significantly
The decay resistance of steel is improved, therefore to deep-sea think gauge marine riser steel, by nickel control in higher level.But nickel and molybdenum class
Seemingly, precious metal is belonged to, the manufacturing cost for being easily caused steel is greatly improved, additionally, too high nickel content easily causes steel plate iron oxide
Skin is difficult to remove, and causes plate surface quality problem.
Copper（Cu）Content be 0.95~1.40%, add the copper of high level, improve the intensity of steel, quenching degree and
High-temperature stability, and weather-proof, the decay resistance of steel can be improved.But copper is low-melting-point metal, easily causes hot-short, excessive addition pair
The low-temperature flexibility of steel is unfavorable.
Chromium（Cr）Content be 0~0.30%, chromium is also the quenching degree element for improving steel, and with certain solution strengthening
Effect, additionally, the certain chromium of addition can also improve weather-proof, the decay resistance of steel.But add too high Cr to be easily caused quenching for steel
Permeability is too high, and generation is difficult to the hardened structure that eliminates, makes that the intensity of steel is too high and toughness is not enough.
Aluminium（Al）Content be 0.010~0.050%, aluminium is main deoxidant element in steel, in can significantly reducing steel
Oxygen content, while aluminium and nitrogen combine to form AlN, being capable of effectively crystal grain thinning.But aluminium content is more than 0.050% in steel
When, the oxide for being easily caused aluminium is mingled with substantially increase, reduces the cleanliness factor of steel, and the low-temperature flexibility to steel is unfavorable.
Phosphorus（P）, sulphur（S）, nitrogen（N）Content is respectively：[%P]≤0.012, [%S]≤0.0020, [%N]≤0.0080.Phosphorus
The cold short of steel is easily caused, sulphur easily causes hot-short, and nitrogen easily causes the quenching failure and deformation of steel to be failed, and causes the performance of steel unstable
It is fixed, therefore to deep-sea think gauge water proof tube steel, should strictly control phosphorus, sulphur, the content of nitrogen in steel.
The present invention, by heating steel billet to 1150~1250 DEG C, is the abundant solid solution for ensureing micro alloying element, while anti-
Only austenite crystal is too grown up.
By roughing temperature control at 1050~1200 DEG C, single pass reduction ratio is not less than 10%, and accumulation reduction ratio is not less than
60%, its purpose makes to make austenite crystal fully refine by dynamic and static recrystallization, while suppressing Austenite Grain Growth.
By final rolling temperature control at 780~900 DEG C, finish rolling accumulation reduction ratio is not less than 60%, is to prevent part from tying again
Crystalline substance, caused grain size is uneven, while making austenite crystal fully flatten, forms enough Zona transformans and is beneficial to forming core,
Organized after refinement phase transformation.
Why by 10~30 DEG C/s of cooldown rate, final cooling temperature≤300 DEG C, it is to be beneficial to form tiny, uniform
Homogeneous structure.
Why align again after first 40~60s of relaxation, and control aligning entrance drafts≤3mm after the cooling period.So as to rectify
Straight front spring temperature is uniform, it is ensured that plate shape is good, while because avoiding the excessive processing hardening for causing of straightener inlet drafts aobvious
Write the low-temperature flexibility for deteriorating steel plate.
Carry out modifier treatment, and control 880-950 DEG C of hardening heat, the cool time according to steel plate thickness（Unit is mm）
1.0 ~ 1.5 times meter, chronomere is min；By temperature control at 600 ~ 720 DEG C, tempering time is according to steel plate thickness（It is single
Position is mm）1.0 ~ 2.0 times of meters, chronomere is min so that steel plate tissue full and uniformization, obtain intensity, low-temperature flexibility and
Fatigue behaviour matches good preferable tempered sorbite tissue.
The present invention compared with prior art, due to the quenched production works of TMCP+ using rational composition design and optimization
Skill, can significantly improve obdurability matching and tissue, the performance uniformity of thickness direction of think gauge water proof tube steel, solve deep
Sea high-intensity high-tenacity water proof tube steel low temperature fracture toughness and the not enough problem of FATIGUE STABILITY.Test and through assay
Show, by the control of component and content and production technology, preferable fine grain tempered sorbite can be obtained along thickness of slab direction
Tissue, it is possible to achieve excellent strong, modeling of the deep-sea required by think gauge high-performance water proof tube steel, tough and fatigue behaviour good
Good matching, the yield strength R of steel platet0.5>=555MPa, tensile strength Rm>=625MPa, -50 DEG C of KV2>=200J, -30 DEG C
DWTT SA >=85%.
Specific embodiment
The present invention is described in detail below：
Table 1 is the comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example performance text list.
Various embodiments of the present invention are produced according to following steps：
1）After routine is smelted and is casting continuously to form base, to heating strand, heating-up temperature is 1150~1250 DEG C；
2）Roughing is carried out, at 1050~1200 DEG C, single pass reduction ratio is not less than 10%, accumulation pressure to control roughing temperature
Rate is not less than 60%；
3）Finish rolling is carried out, at 780~900 DEG C, finish rolling accumulation reduction ratio is not less than 60% to control final rolling temperature；
4）Cooled down, control cooldown rate is in 10~30 DEG C/s, final cooling temperature≤300 DEG C；
5）Aligned, it is advanced run 40~60s of Henan after align again, aligning entrance drafts≤3mm；
6）It is heat-treated, control hardening heat is at 880-950 DEG C；Quenching Soaking Time is according to 1.0 ~ 1.5 times of steel plates
Thickness gauge, Quenching Soaking Time unit is min, and steel plate thickness unit is mm；Control temperature at 600 ~ 720 DEG C, protect by tempering
The warm time according to 1.0 ~ 2.0 times of steel plate thickness gauge, tempering insulation time unit be min, steel plate thickness unit be mm.
The chemical constituent and weight percentage of the various embodiments of the present invention of table 1 and comparative example
The main technologic parameters list of the various embodiments of the present invention of table 2 and comparative example
The mechanics and weather resistance experiment result list of the various embodiments of the present invention of table 3 and comparative example
Be can be seen that by the data of table 3：The present invention is controlled by the combination of composition and technique, it is possible to achieve advised with thick at deep-sea
Lattice water proof tube steel high intensity, high-ductility, the matched well of excellent low temperature toughness, and comparative example is due to composition, controlled rolling and controlled cooling work
The difference of skill or Technology for Heating Processing, intensity, low-temperature flexibility are difficult to reach the technical requirements of deep-sea think gauge water proof tube steel.
Above-described embodiment is only most preferably to enumerate, and is not the restriction to embodiments of the present invention.
Claims (2)
1. a kind of deep-sea high-performance marine riser steel, the percentage by weight of its chemical composition is：C：0.020~0.029%, Si：
0.10 ~ 0.30%, Mn：1.00~1.39% or Mn：1.65~1.80%, P：≤ 0.012%, S≤0.0020%, Cu：0.95~
1.40%th, Cr：0.21~0.30%, Ni：0.70~1.50%, Mo：0.23 ~ 0.30%, Nb：0.052~0.060%, Ti：
0.022~0.025%, Al：0.010~0.050%, N：≤ 0.008%, remaining is Fe and inevitable impurity；Thickness exists
More than 25.4mm, yield strength Rt0.5>=555MPa, tensile strength Rm≥625MPa、-50℃ KV2>=200J, -30 DEG C of DWTT
SA >=85%；
Production method：
1）After routine is smelted and is casting continuously to form base, to heating strand, heating-up temperature is 1150~1250 DEG C；
2）Roughing is carried out, at 1050~1200 DEG C, single pass reduction ratio is not less than 10% to control roughing temperature, and accumulation reduction ratio is not
Less than 60%；
3）Finish rolling is carried out, at 780~900 DEG C, finish rolling accumulation reduction ratio is not less than 60% to control final rolling temperature；
4）Cooled down, control cooldown rate is in 10~30 DEG C/s, final cooling temperature≤300 DEG C；
5）Aligned, it is advanced run 40~60s of Henan after align again, aligning entrance drafts≤3mm；
6）It is heat-treated, control hardening heat is at 880-950 DEG C；Quenching Soaking Time is according to 1.0 ~ 1.5 times of thickness of steel plate
Meter, Quenching Soaking Time unit is min, and steel plate thickness unit is mm；Temperature is controlled at 600 ~ 720 DEG C, during tempering insulation
Between according to 1.0 ~ 2.0 times of steel plate thickness gauge, tempering insulation time unit is min, and steel plate thickness unit is mm.
2. a kind of deep-sea as claimed in claim 1 production method of high-performance marine riser steel, its step：
1）After routine is smelted and is casting continuously to form base, to heating strand, heating-up temperature is 1150~1250 DEG C；
2）Roughing is carried out, at 1050~1200 DEG C, single pass reduction ratio is not less than 10% to control roughing temperature, and accumulation reduction ratio is not
Less than 60%；
3）Finish rolling is carried out, at 780~900 DEG C, finish rolling accumulation reduction ratio is not less than 60% to control final rolling temperature；
4）Cooled down, control cooldown rate is in 10~30 DEG C/s, final cooling temperature≤300 DEG C；
5）Aligned, it is advanced run 40~60s of Henan after align again, aligning entrance drafts≤3mm；
6）It is heat-treated, control hardening heat is at 880-950 DEG C；Quenching Soaking Time is according to 1.0 ~ 1.5 times of thickness of steel plate
Meter, Quenching Soaking Time unit is min, and steel plate thickness unit is mm；Temperature is controlled at 600 ~ 720 DEG C, during tempering insulation
Between according to 1.0 ~ 2.0 times of steel plate thickness gauge, tempering insulation time unit is min, and steel plate thickness unit is mm.
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| CN114959483B (en) * | 2022-06-02 | 2023-06-16 | 武汉钢铁有限公司 | Weather-resistant steel resistant to wet heat and high in salinity marine atmospheric environment and production method thereof |
| CN115449698B (en) * | 2022-09-30 | 2024-01-23 | 马鞍山钢铁股份有限公司 | Microbial corrosion resistant pipeline steel with yield strength of 480MPa and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082108A (en) * | 2007-06-29 | 2007-12-05 | 武汉钢铁(集团)公司 | Steel plate for producing seabed pipe line and rolling method therefor |
| CN102277530A (en) * | 2011-08-15 | 2011-12-14 | 武汉钢铁(集团)公司 | Pipeline steel with thickness more than or equal to 25mm for deep sea and production method thereof |
| CN104451431A (en) * | 2014-11-19 | 2015-03-25 | 钢铁研究总院 | High-performance marine riser board and production method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082108A (en) * | 2007-06-29 | 2007-12-05 | 武汉钢铁(集团)公司 | Steel plate for producing seabed pipe line and rolling method therefor |
| CN102277530A (en) * | 2011-08-15 | 2011-12-14 | 武汉钢铁(集团)公司 | Pipeline steel with thickness more than or equal to 25mm for deep sea and production method thereof |
| CN104451431A (en) * | 2014-11-19 | 2015-03-25 | 钢铁研究总院 | High-performance marine riser board and production method |
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