CN106811699A - A kind of ERW X65 hot-rolled coils and its manufacture method - Google Patents
A kind of ERW X65 hot-rolled coils and its manufacture method Download PDFInfo
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Abstract
The present invention discloses a kind of ERW X65 hot-rolled coils and its manufacture method, and the chemical composition in steel is：C：0.07%~0.10%, Si：0.10%~0.30%, Mn：1.10%~1.25%, P≤0.018%, S≤0.005%, Ti：0.008%~0.020%, Als：0.02%~0.06%, Nb：0.010%~0.019%, Cr：0.30%~0.50%, N≤0.005%, Ceq≤0.40%, remaining is Fe and inevitable element.Continuous casting steel billet is heated to 1150~1220 DEG C, then carries out two-stage control rolling, 960 DEG C of first stage finishing temperature ＞；1000 DEG C of second stage start rolling temperature ＜, finishing temperature is 780~880 DEG C, cooling velocity is 8~15 DEG C/s, batched at 570~650 DEG C, obtain the bainite-ferritic structure of fine uniform, wherein, ferrite content 5%~10%, can be used for manufacturing X65 grades of steel pipe of the ERW for meeting the requirement of API SPEC 5L standards.
Description
Technical field
The present invention relates to a kind of manufacture of line steel hot rolling roll bending of pipe-line, especially relate to
And a kind of high-frequency straight seam electric resistance welding (ERW) uses line steel hot rolling roll bending and its manufacture method, should
Roll bending intensity is X65 grade of steels in API Spec 5L standards.
Background technology
Oil is the main energy sources of industrial development, and petroleum pipeline conveying has efficient, safety, warp
The features such as Ji.Be reduce oil pipeline conveying cost, petroleum transportation pipeline be intended to heavy caliber,
Hi-grade steel direction is developed.Simultaneously, it is ensured that the stability and security of pipeline, over long distances,
High-pressure delivery pipeline needs the pipe line steel there is enough intensity to ensure safety.At present, X65 is still
It is so the main flow grade of steel of long-distance transport pipes engineering.
The tubing for being used in country's oil-gas pipeline engineering at present can be divided into seamless steel pipe, alternating-current resistance
The presence or absence of Coiling Welded Pipe (ERW or HFW), 8 kinds of submerged-arc welding steel pipe three major types, mainly use
Seam steel pipe (SML), spiral seam submerged-arc welding pipe (SSAW), straight-line joint submerged arc welding tube (LSAW),
4 kinds of high-frequency straight seam resistance weld pipe (ERW) etc..
High-frequency straight seam resistance weld pipe is by after forming machine, using high frequency electric by hot-rolled coil
Kelvin effect and kindred effect, make pipe flange heat fusing, and pressure is carried out in the presence of compression roller
Weld to produce.Alternating-current resistance soldering method starts to apply Welded tube production in the 1950's,
The production comparative maturity of 20 end of the centurys ERW steel pipes in the world.ERW steel pipes no matter
The oil well pipe of land or ocean, transportation pipe aspect are obtained for more universal use.
At present, using conventional hot continuous rolling machine unit production X65 line steel hot rolling roll bendings in engineering
Batch application, forms correlation technique, but generally require addition more amount precious alloy (Nb,
V, Ni), cost of alloy is high.Appropriate alloy chromium production X65 pipe line steel heat is added using low niobium
Roll bending rare report is rolled, it is simple below to introduce the patent and document being closer to the present invention：
(1) patent application CN101418363A, a kind of low carbon and high ductility X 60/X/X65 pipelines
The production method of steel, contains C≤0.060%, Mn in disclosed composition：1.20%~1.40%,
Nb：0.02%~0.04%, V：0.02%~0.04%.C content is relatively low in the patent application,
Need to add alloy element Nb and V proof strengths, cost of alloy is high.
(2) patent application CN101082106A, a kind of producing X 65 pipe steel with low cost
Method, contains C in disclosed composition：0.046%~0.060%, Mn：1.40%~1.60%, Nb：
0.045%~0.050%.Nb contents are higher in the patent application, and cost of alloy is high.
(3) Liu Xiaodong, Sun Wei《Steel rolling》The 5th 56-59 pages of the phases of volume 24 in 2007 deliver
Paper " exploitation of Ji steel low cost X65 pipe line steels and production " in, disclosed X65 is managed
The composition of line steel is C：0.06%~0.07%, Mn：1.49%~1.52%, Nb：
0.077%~0.081%, Ni：0.10%~0.13%, cost of alloy is high.
(4) Song Haiwu, neat long hair et al. exist《Special steel》The 3rd phase hairs of volume 30 in 2009
In the paper " influence of the controlled rolling and cooling process parameter to X65 pipeline steel microscopic structures " of table,
Disclosed X65 pipelines composition of steel is C：0.08%, Mn：1.38%, Nb：0.032%, V：
0.041%, cost of alloy is high.
(5) Qianjiang, Jiang Haitao exists《Wide and Thick Slab》The opinion that the 6th phase of volume 12 in 2006 delivers
In literary " the impact flexibility research of X65 hot rolling Pipeline Steel Plates ", disclosed X65 hot rollings pipeline
The composition of steel plate is C：0.055%, Mn：1.57%, Nb：0.051%, Nb cost of alloy
It is high.
In patent disclosed above or document, C content is not high, is typically necessary addition certain
Amount Nb and V proof strengths, add individually Ni, and cost of alloy is high.Used with the present invention
Low Nb additions Cr is designed with significantly different part.
The content of the invention
It is an object of the invention to provide a kind of X65 Grade Pipeline Steels hot-rolled coil and its manufacture
Method, the X65 hot-rolled coils of ERW tubulations are designed for especially with low niobium containing chromium component
And its manufacture method.
For the production ERW cost of alloy that X65 hot-rolled coils are present problems high at present,
Propose technical scheme.
The ERW chemical compositions (weight, %) of X65 hot-rolled coils match as follows：C：
0.07%~0.10%, Si：0.10%~0.30%, Mn：1.10%~1.25%, P≤0.018%,
S≤0.005%, Ti：0.008%~0.020%, Als：0.02%~0.06%, Nb：
0.010%~0.019%, Cr：0.30%~0.50%, N≤0.005%, Ceq≤0.40%, its
It is remaining for Fe and inevitable element.
The mechanism of action of each element is as follows in the present invention：
C：Carbon belongs to solid solution element, mainly plays solution strengthening effect, is that proof strength has the most
The element of effect, can improve quenching degree, therefore, carbon content is unsuitable too low；But, carbon content
Increase it is unfavorable to toughness of material and weldability, so, carbon content can not be too high, the present invention
Carbon control is more suitable 0.07%~0.10%.
Si：Silicon can play solution strengthening effect, but its too high levels can make the plasticity of steel and tough
Property reduce, its optimum range is 0.10%~0.30%.
Mn：Manganese mainly plays solution strengthening, can make up pipe line steel because of carbon content reduction
The yield strength of loss, moreover it is possible to increase stabilization of austenite, to low-temperature flexibility and raising quenching degree
Also it is favourable.The effect of manganese also landing low transformation temperature, contributes to crystal grain refinement, improve intensity and
Toughness.But, the too high easy induction segregation of manganese content, Mn contents are controlled 1.10%~1.25%
It is more suitable.
P：Phosphorus is harmful element in steel, increases the cold brittleness of steel, welding performance is degenerated, and is dropped
Inductile, makes cold-bending property degenerate, and should control its content≤0.018%.
S：Sulphur is harmful element in steel, steel is produced red brittleness, reduces the ductility of steel and tough
Property, it is also unfavorable to welding performance, its content≤0.005% should be controlled.
Ti：Titanium is strong carbonitride-forming elements, notable fining austenite grains, can make up because
The decline of the intensity that carbon is reduced and caused.Content is too high, easily forms thick TiN, reduces material
Material performance, suitable scope is 0.008%~0.020%.
Als：Aluminium is conventional deoxidier, and a small amount of aluminium is added in steel, can crystal grain thinning,
Impact flexibility is improved, suitable scope is 0.02%~0.06%.
Nb：Niobium is fine grain and precipitation strength element, improving welding property.Have in pipe line steel
There is strong Grain Refinement Effect, this effect is mainly due to delay or prevents machine behind hot rolling
Austenite recrystallization in frame, Nb is being carried by reducing austenite to ferritic phase temperature
Crystal grain growth rate is reduced while ferrite nucleation rate high.Nb may additionally facilitate bayesian simultaneously
Body is organized the formation of and acted on precipitation strength.But too high to increase cost of alloy, suitable scope is
0.010%~0.019%.
Cr：Chromium has very strong solution strengthening effect, can also effectively improve structure stability.
Improve intensity and crystal grain thinning aspect, Cr as Mo, can suppress granular ferrite formation,
Crystal grain thinning simultaneously promotes bainite and acicular ferrite to change, and obtains more and thin bainite group
Knit, it is ensured that more than 10 grades of grain size, so as to greatly improve intensity, and ensure ERW tubulations
Weldability.Meanwhile, Cr is used cooperatively with Nb, can promote the precipitation of Nb, improves Nb
Precipitation strength effect.With the increase of Cr contents, intensity rising is larger, but if adding
Amount is too big, can significantly reduce welding heat influence area toughness and solderability, and lower limit is less than 0.30%
When, the effect of Cr will not be obvious.Therefore, the OK range of Cr of the present invention is 0.30%~0.50%.
N：Solid solution nitrogen has the strong effect of pinning dislocation, has harmful effect to toughness, should control
Its content≤0.005%.
A kind of ERW manufacture methods of X65 hot-rolled coils, including molten iron pretreatment, molten steel
Smelt, external refining and continuous casting of middle-thin slabs, continuous casting billet are reheated, roll, cool down, batched.
It is characterized in that：
(1) continuous casting process is smelted：Smelting process uses molten iron pretreatment, converter smelting, stove
Outer refining, thin continuous casting steel billet during the molten steel continuous casting after refining is made.Converter smelting uses top blast
Or top bottom blowing, external refining uses the frivolous sulphuring treatment of LF stoves and carries out Calcium treatment to control
Inclusion morphology processed and the ductility, toughness and the cold-bending property that improve steel, continuous casting are stirred using electromagnetism
Mix or dynamic soft-reduction, to improve the quality of continuous casting steel billet.
(2) cooling technique is rolled：The heated stove heat of continuous casting steel billet to 1150~1220 DEG C,
The heating temperature range can ensure the abundant solid solution of alloying element, meanwhile, suppress austenite crystal
Too grow up；Then two-stage control rolling, first stage finish to gauge temperature are carried out in hot tandem
Degree is more than 960 DEG C；Second stage start rolling temperature is less than 1000 DEG C, and finishing temperature is 780~880
DEG C, the finishing temperature can effective fining austenite grains, grain size reaches more than 10 grades.Roll
Roll bending is cooled down with the cooling velocity of 8~15 DEG C/s afterwards, and coiled sheet is carried out in 570~650 DEG C of temperature
Batch, obtain the bainite-ferritic structure of fine uniform, wherein, ferrite content
5%~10%.
The beneficial effect of technical solution of the present invention：
1) this programme C, Mn contents are moderate, and Nb contents are low, and a small amount of Cr replaces noble element
Ni, V etc., save cost of alloy；
2) bainite-ferritic structure is finally organized as, ferrite content 5%~10% is tough
Property matching it is good.
3) the soft phase of 5%~10% ferrite, can effectively control yield tensile ratio in small scope
0.85~0.89, it is ensured that pipe safety；The soft phase of ferrite also mitigates ERW and welded simultaneously
The tendency cracked in journey.
Brief description of the drawings
The tissue of Fig. 1 invention steel.
Specific embodiment
A kind of ERW is as follows with the chemical composition of X65 hot-rolled coils：C：0.07%~0.10%,
Si：0.10%~0.30%, Mn：1.10%~1.25%, P≤0.018%, S≤0.005%, Ti：
0.008%~0.020%, Als：0.02%~0.06%, Nb：0.010%~0.019%, Cr：
0.30%~0.50%, N≤0.005%, Ceq≤0.40%, remaining is Fe and inevitable unit
Element.Through top blast or top bottom blowing, the frivolous sulphuring treatment of LF stoves and carry out Calcium treatment, molten steel
Continuous casting thin continuous casting steel billet in being made, continuous casting uses electromagnetic agitation or dynamic soft-reduction, continuous casting steel billet
Heated stove heat carries out two-stage control and rolls to 1150~1220 DEG C, then in hot tandem
System, first stage finishing temperature is more than 960 DEG C；Second stage start rolling temperature is less than 1000 DEG C,
Finishing temperature is 780~880 DEG C, rolls rear roll bending and is cooled down with the cooling velocity of 8~15 DEG C/s,
Coiled sheet is carried out in 570~650 DEG C of temperature to batch, obtain the bainite-ferrite group of fine uniform
Knit, wherein, ferrite content 5%~10%.
Following examples are used to illustrate present invention, embody invention effect.Table 1 is real
Apply the chemical composition of a steel；Heating, rolling cooling technique of the table 2 for embodiment steel；Table 3 is
The microstructure and mechanical property of embodiment steel.
The chemical composition (wt, %) of the embodiment steel of table 1
The heating of the embodiment steel of table 2, rolling cooling technique
The microstructure and mechanical property of the embodiment steel of table 3
From above-described embodiment as can be seen that using composition of the invention, smeltings, continuous casting, add
Heat, rolling, cooling and coiling technique, the ERW for producing X65 hot-rolled coils, mechanics
Performance meets API SPEC 5L standards to the X65 grades of requirement of steel pipe, can be used for manufacture full
The ERW of sufficient API SPEC 5L standards requirement is reached with X65 grades of steel pipe, yield strength
More than 490MPa, tensile strength in more than 560MPa, elongation more than 34%, Qu Qiang
Than controlling below 0.90.
Claims (2)
1. a kind of ERW X65 hot-rolled coils, it is characterised in that the chemical composition in steel is pressed
Percentage by weight is calculated as：C：0.07%~0.10%, Si：0.10%~0.30%, Mn：
1.10%~1.25%, P≤0.018%, S≤0.005%, Ti：0.008%~0.020%, Als：
0.02%~0.06%, Nb：0.010%~0.019%, Cr：0.30%~0.50%, N≤0.005%,
Ceq≤0.40%, remaining is Fe and inevitable element, and remaining is Fe miscellaneous with inevitable
Matter.
2. a kind of ERW as claimed in claim 1 manufacture methods of X65 hot-rolled coils,
Including molten iron pretreatment, smelting molten steel, external refining and continuous casting of middle-thin slabs, continuous casting billet are again
Heat, roll, cool down, batch, it is characterised in that continuous casting steel billet is heated to 1150~1220
DEG C, two-stage control rolling is then carried out, first stage finishing temperature is more than 960 DEG C；Second
Stage start rolling temperature is less than 1000 DEG C, and finishing temperature is 780~880 DEG C, with 8~15 DEG C/s after rolling
Cooling velocity cooled down, batched at 570~650 DEG C.
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Cited By (4)
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| CN109957714A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | The pipeline steel and its manufacturing method of intensity and excellent in low temperature toughness |
| JP2019116659A (en) * | 2017-12-27 | 2019-07-18 | Ｊｆｅスチール株式会社 | Thick walled large diameter electroseamed steel pipe excellent in fatigue strength, and manufacturing method therefor |
| 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109957714A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | The pipeline steel and its manufacturing method of intensity and excellent in low temperature toughness |
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| 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 |
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Application publication date: 20170609 |