CN107988562A - A kind of X65 grades inexpensive submerged pipeline steel and its manufacture method - Google Patents
A kind of X65 grades inexpensive submerged pipeline steel and its manufacture method Download PDFInfo
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- CN107988562A CN107988562A CN201610951516.3A CN201610951516A CN107988562A CN 107988562 A CN107988562 A CN 107988562A CN 201610951516 A CN201610951516 A CN 201610951516A CN 107988562 A CN107988562 A CN 107988562A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Mechanical Engineering (AREA)
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Abstract
The present invention provides a kind of X65 grades inexpensive submerged pipeline steel and its manufacture method, the component of the pipe line steel are as follows by weight percentage：C：0.05% 0.09%, Si：0.10% 0.30%, Mn：1.40% 1.60%, P：≤ 0.018%, S：≤ 0.008%, Ti：0.008% 0.020%, Als：0.02% 0.06%, Nb：0.02% 0.04%, Cr：0.10% 0.15%, N：≤ 0.008%, Pcm≤0.20, remaining is Fe and inevitable element；Manufacture method：Smelting, continuous casting, continuous casting billet are reheated, roll, cool down, batched；There is higher-strength and good weldability using pipe line steel produced by the invention；Rolling and taking-up equipment load are small, roll and batch easy implementation.
Description
Technical field
The invention belongs to metal material field, more particularly to a kind of inexpensive spiral submerged arc welded with line steel hot rolling roll bending and
Its manufacture method.
Background technology
It is different with requirement of the marine environment difference to Submarine pipeline steel according to pumped (conveying) medium.For transfer oil, naturally
Gas, the Submarine pipeline steel being operated in low temperature, high pressure, deep-etching rough seas, is subjected to external and internal pressure, axial direction
The synergy of the dead loads such as power, moment of flexure and temperature load, and still suffer from the external pressure, wave, the dynamic loading of ocean current of alternation
Effect, pipeline is subject the synergy of a variety of load and trigger the destruction of diversified forms.Therefore, to strength and toughness,
The indexs such as compressive property, corrosion resistance, dimensional accuracy suffer from strict requirements.To reach corresponding requirements, such pipe line steel
A large amount of expensive alloying elements are usually added in design, big using harsh rolling cooling technique, manufacture difficulty.Simplify point
But for for conveying non-petroleum, natural gas, sewage discharge such as up to standard, water-coal-slurry medium, are operated in ocean
The low and middle-end Submarine pipeline steel of the general neritic province domain of environment can then use low-cost design, while it is easy to roll cooling technique
In implementation.Design C, the Mn content of such low and middle-end Submarine pipeline steel is moderate, and cost of alloy is low, with higher-strength and well
Weldability, can meet completely standard requirement, under the market condition of steel excess capacity, with more the big market competitiveness
And market prospects.
At present, at the beginning of being had using conventional hot continuous rolling machine unit production submerged pipeline with X65 line steel hot rolling roll bendings in engineering
Step application, but generally meet transfer oil, the high-end market Demand Design of natural gas, it is necessary to add the precious alloy of more amount
(Ni, Cu, V etc.), cost of alloy are high.But do not have for the non-conveyed oil of conveying, the conventional ocean steel for pipe of natural gas motorcar
There is correlative study, add a small amount of alloy chromium production low cost X65 line steel hot rollings roll bending without report especially with low niobium, below
It is simple to introduce the patent being closer to the present invention and document：
Chinese invention CN103834874A, the high DWTT performances X65-X70 submerged pipelines steel of heavy wall and autofrettage.Contain in component
C：0.03%-0.05%, Mn：1.47%-1.70%, Cr：0.10%-0.20%, Cu：0.12%-0.20%, Ni：0.36%-
0.45%, Nb：0.04%-0.05%.80 ± 20 DEG C of finish rolling start rolling temperature, 790 ± 15 DEG C of finish rolling finishing temperature.C in the patent
Content is relatively low, it is necessary to add more alloying element Ni, Cu proof strength, and cost of alloy is high.Finish rolling start rolling temperature is low, mill load
Greatly.
Chinese invention CN103451536A, a kind of low cost think gauge submerged pipeline steel plate and its manufacture method.In component
Containing C：0.04%-0.06%, Mn：1.43%-1.47%, Ni：0.10%-0.15%, Nb：0.03%-0.04%.Finishing temperature
750-810 DEG C, steel plate relaxation slow cooling after rolling, 350-450 DEG C of final cooling temperature.C content is relatively low, it is necessary to add more in the patent
Alloying element Ni proof strengths, cost of alloy are high.The slow cooling of steel plate relaxation is in hot continuous rolling not qualified to exploit after rolling, eventually cold temperature
Spend low, batch difficulty.
Chinese invention CN105132833A, a kind of economical high intensity submerged pipeline steel and production method.Contain C in component：
0.05%-0.08%, Mn：0.8%-1.3%, Cr：0.10%-0.30%, V：0.020%-0.045%, Nb：0.015%-
0.040%.Cooldown rate is not less than 70 DEG C/s, 200-350 DEG C of coiling temperature.C content is relatively low, it is necessary to add more in the patent
Alloying element Ni proof strengths, cost of alloy are high；Cooling velocity is fast, it is difficult to controls, coiling temperature is low, coiling machine is required high.
Paper " exploitation of think gauge submerged pipeline steel X65 production technologies " (Liaoning Technology University's journal, 2012,35 (4)：
402-406), C in its component：0.10%, Mn：1.65%, Ni：0.30%, Cr：0.30%, Mo：0.50%, Nb：0.06%,
V：0.06%, Ti：0.04%；Using low finishing temperature+low red temperature production.C content is slightly higher in the patent, and Mn contents are high,
It is high containing a large amount of alloying element Ni, Mo, Nb, V etc., cost of alloy at the same time.
In patent disclosed above or document, the precious alloy (Ni, Cu, V etc.) of more amount is added, cost of alloy is high；
Rolling is low with coiling temperature in technique, high to mill capacity and coiling machine Capability Requirement.C-Mn-Nb-Cr is used with the present invention
Low-cost design have significantly different part.
The content of the invention
A kind of X65 grade of steels seabed conveyance conduit pipeline is provided it is an object of the invention to overcome the above problem and deficiency
Steel hot-rolled coil and its manufacture method, have higher-strength and good weldability, save cost of alloy, rolling and taking-up equipment
Load is small, rolls and batch easy implementation.
The object of the present invention is achieved like this：
A kind of X65 grades inexpensive submerged pipeline steel, the component of the steel plate are as follows by weight percentage：C：0.05%-
0.09%, Si：0.10%-0.30%, Mn：1.40%-1.60%, P：≤ 0.018%, S：≤ 0.008%, Ti：0.008%-
0.020%, Als：0.02%-0.06%, Nb：0.02%-0.04%, Cr：0.10%-0.15%, N：≤ 0.008%, Pcm≤
0.20, wherein Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B, remaining is Fe and inevitable member
Element.
The steel plate is organized as acicular ferrite and a small amount of ferritic line and staff control, wherein, ferrite percentage
Content 4%-8%.
Compared with prior art, C, Mn content of the present invention is moderate, and Nb contents are low, a small amount of Cr substitution noble elements Ni, Mo, V
Deng saving cost of alloy.
Present component design reason is as follows：
C：Carbon belongs to solid solution element, mainly plays solution strengthening effect, is the maximally efficient element of proof strength, can improve
Quenching degree.Carbide Precipitation is formed with carbide, plays precipitation enhancement.Therefore, carbon content is unsuitable too low；
But the increase of carbon content is unfavorable to toughness of material and weldability, so, carbon content can not be excessive, and carbon control of the present invention exists
0.05%~0.09% is more suitable.
Si：Silicon can play solution strengthening effect, but its too high levels can reduce the plasticity of steel and toughness, its optimal model
It is 0.10%-0.30% to enclose.
Mn：Manganese mainly plays solution strengthening and phase transformation strengthening, can make up what pipe line steel lost by carbon content reduction
Yield strength, moreover it is possible to increase stabilization of austenite, it is also favourable to low-temperature flexibility and raising quenching degree.Manganese also landing low transformation temperature
Effect, contribute to crystal grain refinement, improve intensity and toughness.But manganese content is excessive easily to induce segregation, cause component, tissue
It is uneven.The control of Mn contents is more suitable 1.40%~1.60%.
P：Phosphorus is harmful element in steel, increases the cold brittleness of steel, welding performance is degenerated, and reduces plasticity, makes cold-bending property
Degenerate, its content≤0.018% should be controlled.
S：Sulphur is harmful element in steel, steel is produced red brittleness, reduces the ductility and toughness of steel, to welding performance also not
Profit, should control its content≤0.008%.
Ti：Titanium is strong carbonitride-forming elements, and notable fining austenite grains, can make up strong because caused by reducing carbon
The decline of degree.Content is too high, easily forms thick TiN, reduces material property, suitable scope is 0.008%-0.020%.
Als：Aluminium is common deoxidier, and a small amount of aluminium is added in steel, can crystal grain thinning, improve impact flexibility, properly
Scope be 0.02%-0.06%.
Nb：Niobium is fine grain and precipitation strength element, improving welding property.In pipe line steel there is strong crystal grain refinement to make
With this effect is mainly due to the austenite recrystallization in rack behind delay or prevention hot rolling, and Nb is by reducing austenite
To ferritic phase temperature, crystal grain growth rate is reduced while ferrite nucleation rate is improved.Nb is quick after rolling at the same time
Cooling stage can promote acicular ferrite structure to be formed, while the slow cooling stage with precipitation strength effect, improves strong after batching
Spend but do not reduce low-temperature flexibility.But excessive to increase cost of alloy, suitable scope is 0.02%-0.04%.
Cr：Chromium has very strong solution strengthening effect, can also effectively improve structure stability.Improving intensity and refinement crystalline substance
Grain aspect, Cr can inhibit the formation of granular ferrite, crystal grain thinning and promote acicular ferrite to change, acquisition is more with Mo as
And thin acicular ferrite structure, ensure more than 10 grades of grain size, so as to greatly improve intensity, and ensure the weldability of tubulation,
Especially for think gauge pipe line steel, it is necessary to which adding a certain amount of Cr improves quenching degree to make up the loss of strength of gauge strips, change
The uniformity of tissue and performance on kind thickness direction.Meanwhile Cr and Nb is used cooperatively, the precipitation of Nb can be promoted, improve Nb's
Precipitation strength acts on.More than 0.10% Cr is added, the corrosion resistance of steel can be improved.With the increase of Cr contents, intensity
Rise larger, but if addition is too big, welding heat influence area toughness and solderability can be significantly reduced.Therefore, Cr of the present invention
OK range is 0.10%-0.15%.
N：Solid solution nitrogen has the strong effect of pinning dislocation, has harmful effect to toughness, should control its content≤0.008%.
A kind of its manufacture method of X65 grades of inexpensive submerged pipeline steel, including smeltings, continuous casting, continuous casting billet reheating, roll
Make, cool down, batch；
(1) smelt, continuous casting：Molten iron pre-processes, and converter smelting-through top blast or top bottom blowing, external refining, LF stoves
Frivolous sulphuring treatment and ductility, toughness and the cold-bending property for carrying out Calcium treatment to control inclusion morphology and improve steel, slab connect
Casting is made continuous casting steel billet, and continuous casting uses electromagnetic agitation or dynamic soft-reduction, to improve the quality of continuous casting steel billet；
(2) roll：The heated stove heat of continuous casting steel billet keeps the temperature 140-300 minutes, the heating-up temperature to 1130-1160 DEG C
Scope can ensure that alloying element is fully dissolved, meanwhile, prevent austenite grain from too growing up；Then carried out in hot tandem
Two-stage control rolls, and first stage start rolling temperature is 1120-1160 DEG C, and finishing temperature is more than 970 DEG C, and accumulative deflection is more than
60%, make the crystal grain refinement after austenite recrystallization；Second stage start rolling temperature is less than 960 DEG C, finishing temperature 790-840
DEG C, under the rolling mill practice, deformation and phase transformation are carried out at the same time, and austenite grain is elongated, the increase of austenite grain boundary and glide band
Occur providing advantage for ferrite forming core, obtain fine grain ferrite；
(3) cool down：Roll rear roll bending to be cooled down with the cooling velocity of 10-25 DEG C/s, coiled sheet is carried out in 480-600 DEG C of temperature
Batch, obtain the acicular ferrite of fine uniform and a small amount of ferritic line and staff control, wherein, ferrite content 4%-8%.
The beneficial effects of the present invention are：
(1) C, Mn content of the present invention is moderate, Pcm≤0.20%, has higher-strength and good weldability；
(2) present invention is substituted using C-Mn-Nb-Cr low-cost designs adds a large amount of expensive alloying elements Ni, Cu, V etc., section
About cost of alloy.
(3) finishing temperature of the present invention and coiling temperature are moderate, and rolling and taking-up equipment load are small, roll and batch easy reality
Apply.
Brief description of the drawings
Fig. 1 is 1 microscopic structure metallograph of the embodiment of the present invention.
Embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention is smelted, continuous casting, continuous casting billet reheat, roll, is cold according to the component proportion of technical solution
But, batch.The component of steel of the embodiment of the present invention is shown in Table 1.The main technologic parameters of steel of the embodiment of the present invention are shown in Table 2.It is of the invention real
The tensile property and ferrite content for applying a steel are shown in Table 3.The toughness index of steel of the embodiment of the present invention is shown in Table 4.
The component (wt, %) of 1 steel of the embodiment of the present invention of table
The main technologic parameters of 2 steel of the embodiment of the present invention of table
The tensile property and ferrite content of 3 steel of the embodiment of the present invention of table
The toughness index of 4 steel of the embodiment of the present invention of table
By table 3,4 as it can be seen that component using the present invention, smelting, continuous casting, heating, rolling, cooling and coiling technique, production
The inexpensive submerged pipeline X65 hot-rolled coils gone out, mechanical property meet requirement of the API SPEC 5L standards to X65 grades of steel pipes,
It can be used for the X65 level Submarine pipeline steel pipes that manufacture meets the requirement of API SPEC 5L standards.
Claims (3)
1. a kind of X65 grades inexpensive submerged pipeline steel, it is characterised in that the component of the pipe line steel is as follows by weight percentage：
C：0.05%-0.09%, Si：0.10%-0.30%, Mn：1.40%-1.60%, P：≤ 0.018%, S：≤ 0.008%, Ti：
0.008%-0.020%, Als：0.02%-0.06%, Nb：0.02%-0.04%, Cr：0.10%-0.15%, N：≤
0.008%, Pcm≤0.20, remaining is Fe and inevitable element；
Wherein Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
2. X65 grades of inexpensive submerged pipeline steel according to claim 1, it is characterised in that being organized as the steel plate is needle-shaped
Ferrite and a small amount of ferritic line and staff control, wherein, ferrite percentage composition 4%-8%.
3. a kind of its manufacture method of the inexpensive submerged pipeline steel of X65 levels described in claim 1 or 2, smelting, continuous casting, continuous casting
Base is reheated, rolls, cools down, batched, it is characterised in that：
(1) roll：The heated stove heat of continuous casting steel billet keeps the temperature 140-300 minutes to 1130-1160 DEG C；Then in continuous hot-rolling mill
Group carries out two-stage control rolling, and first stage start rolling temperature is 1120-1160 DEG C, and finishing temperature is more than 970 DEG C, adds up deformation
Amount is more than 60%；Second stage start rolling temperature is less than 960 DEG C, and finishing temperature is 790-840 DEG C；
(2) cool down：Roll rear roll bending to be cooled down with the cooling velocity of 10-25 DEG C/s, coiled sheet volume is carried out in 480-600 DEG C of temperature
Take.
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|---|---|---|---|---|
| CN110306112A (en) * | 2019-07-17 | 2019-10-08 | 张家港宏昌钢板有限公司 | A kind of X65 grades of pipe line steel and its manufacturing method |
| CN110468332A (en) * | 2019-09-02 | 2019-11-19 | 鞍钢股份有限公司 | A kind of thin gauge vertical masonry joint low yield strength ratio high tenacity pipeline roll bending and its manufacturing method |
| CN111057954A (en) * | 2020-01-02 | 2020-04-24 | 鞍钢股份有限公司 | High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof |
| CN111235489A (en) * | 2020-02-17 | 2020-06-05 | 柳州钢铁股份有限公司 | Method for manufacturing X65MS acid-resistant pipeline steel |
| CN111254352A (en) * | 2020-02-17 | 2020-06-09 | 柳州钢铁股份有限公司 | X65MS acid-resistant pipeline steel |
| CN111534741A (en) * | 2020-04-29 | 2020-08-14 | 鞍钢股份有限公司 | Method for rolling steel X56Mo for submarine pipeline |
| CN112779478A (en) * | 2020-12-25 | 2021-05-11 | 鞍钢股份有限公司 | Weather-resistant steel plate for 390 MPa-grade high-speed train bogie and manufacturing method thereof |
| CN114293104A (en) * | 2021-12-31 | 2022-04-08 | 马鞍山钢铁股份有限公司 | Economical steel pipe for hydraulic oil cylinder barrel with yield strength of 550MPa and manufacturing method thereof |
| CN115478213A (en) * | 2021-06-15 | 2022-12-16 | 宝山钢铁股份有限公司 | High-frequency resistance welded pipe for submarine pipeline and manufacturing method thereof |
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| CN110306112A (en) * | 2019-07-17 | 2019-10-08 | 张家港宏昌钢板有限公司 | A kind of X65 grades of pipe line steel and its manufacturing method |
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