CN106756537A - A kind of resistance to H2The excellent high tough normalizing pipe line steel of S corrosive natures and production method - Google Patents
A kind of resistance to H2The excellent high tough normalizing pipe line steel of S corrosive natures and production method Download PDFInfo
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- CN106756537A CN106756537A CN201611073339.XA CN201611073339A CN106756537A CN 106756537 A CN106756537 A CN 106756537A CN 201611073339 A CN201611073339 A CN 201611073339A CN 106756537 A CN106756537 A CN 106756537A
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- normalizing
- steel
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- pipe line
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
- C21D2211/009—Pearlite
Abstract
A kind of excellent high tough normalizing pipe line steel of resistance to H2S corrosive natures, its component and wt%：C 0.05 ~ 0.08%, Si 0.30 ~ 0.45%, Mn 0.85 ~ 1.0%, P≤0.010%, S≤0.0020%, Mo 0.10 ~ 0.20%, Nb 0.06 ~ 0.12%, B are no more than 0.0005% no more than 0.0005%, RE.Production stage：To heating strand；Roughing；Finish rolling；Cooling；Batch；Normalizing.The present invention is outside with high intensity, high tenacity and good weldability, it is necessary to excellent hydrogen sulfide corrosion-resistant performance, crackle is not observed in the case where loaded load is 0.80 × actual yield strength load-up condition.
Description
Technical field
The present invention relates to a kind of pipe line steel and production method, a kind of resistance to H is particularly belonged to2Excellent high tough of S corrosive natures
Normalizing pipe line steel and production method.
Background technology
Oil, natural gas are the important energy sources of the national economic development, and the proportion in energy-consuming increasingly increases.Current pipe
Road conveying is still that oil, natural gas be the most economical, safe and efficient long distance delivery mode.However, with easy exploitation stone
Oil, the exhaustion of natural gas resource, H2S contents construction of natural gas fields dynamics high is just continued to increase.
H2S is most one of hazardous medium of corrosiveness in oil and natural gas.When pipe line steel is exposed to containing wet H2S
Pumped (conveying) medium in when, easily there is H in material2S sour corrosions, cause to send pipeline catastrophic failure, wherein hydrogen induced cracking (HIC)（HIC）With
Sulfide stress cracking (SSC)（SSCC）It is H2The principal mode of S corrosion.
The H contained in China's major part oil gas field2S levels are higher, and the medium of gathering-line pipe conveying is without de-
The oil or natural gas of the treatment such as salt, dehydration, desulfurization.Pipe line steel is removed and requires that it has good intensity, impact property and welding
Outside performance, preferable anti-H is it is also desirable to have2S corrosive natures.Normalizing state pipe line steel because of the uniform characteristic of its organization and performance,
Compared to rolled more suitable for gathering line manufacture.The demand of raising oil-gas transportation efficiency is considered simultaneously, needs exploitation badly
Have concurrently high tough with excellent resistance to H2The normalizing state pipe line steel of S corrosive natures.
Contain H for conveying2The pipe line steel of S petroleum resourceses, corrodes the hydrogen atom for producing constantly to defective locations in steel（Banding
Tissue, field trash, lattice defect etc.）Assemble and produce hydrogen molecule.When rejected region hydrogen molecule concentration is raised to a certain extent,
Habitat will be caused to be permanently deformed and cause pipe line steel actual effect, its important form to be ftractureed including hydrogen induced cracking（HIC）With
Sulfide-stress cracking（SSCC）.
Through retrieval, before making the present invention, Chinese Patent Application No. be CN201010235925.6 with
The document of CN201510297590.3, all refers to normalized steel X60N, its chemical composition use in Mn systems, its presence in C+
Do not possess the problem of corrosion resistance characteristic.
Chinese Patent Application No. is the document of CN201210271608.6, is related to normalized steel X52NS steel, and it uses Cu+
The system of Cr+Ni+V, there is production cost deficiency higher in it.
Chinese Patent Application No. is the document of CN201610419909.X, and it is higher that its normalized steel being related to has a Mn contents,
The intensity of finished product only up to X52 ranks, and do not possess corrosion resistance characteristic.
Chinese Patent Application No. is the document of CN201310146465.3, and it is related to the manufacture of seamless steel pipe, and it has conjunction
Gold dollar cellulose content is high（Cr 1.0~9.0 wt%、W 0.1~0.2 wt%）, do not possess economic sexual clorminance.
The content of the invention
The invention reside in overcoming the shortcomings of that prior art is present, there is provided a kind of with high intensity, high tenacity and good
Outside weldability, it is necessary to excellent resistance to H2The high tough normalizing pipe line steel and production method of S corrosive natures.
Realize the measure of above-mentioned purpose：
A kind of resistance to H2The excellent high tough normalizing pipe line steel of S corrosive natures, its component and weight percent content are：C 0.05~
0.08%, Si 0.30 ~ 0.45%, Mn 0.85 ~ 1.0%, P≤0.010%, S≤0.0020%, Mo 0.10 ~ 0.20%, Nb 0.06 ~
0.12%, B are no more than 0.0005% no more than 0.0005%, RE, and other are Fe and inevitable tramp element；Metallographic structure
For：Ferrite+disperse M/A islands+a small amount of pearlite.
Produce a kind of resistance to H2The method of the excellent high tough normalizing pipe line steel of S corrosive natures, its step：
1）To heating strand after continuous casting, its heating-up temperature is controlled at 1100 ~ 1150 DEG C；
2）Roughing is carried out, and it is 1020 ~ 1070 DEG C to control roughing end temp；
3）Finish rolling is carried out, and controls its start rolling temperature no more than 950 DEG C, finishing temperature is not less than 860 DEG C；
4）Cooled down, coiling temperature is cooled under the conditions of cooling velocity is not less than 55 DEG C/s；
5）Batched, control coiling temperature is no more than 450 DEG C；
6）Normalizing is carried out, and controls normalizing temperature to be incubated according to 2min/mm at 860 ~ 900 DEG C, and again at a temperature of this, and controlled
Normalizing procedure cooling velocity processed is in 5 ~ 8 DEG C/s.
The effect of eachization Element-Level main technique and mechanism in the present invention：
C：C is most basic, most economical intensified element, and the intensity of steel is effectively improved by solution strengthening and precipitation strength.C contains
When amount is less than 0.05%, to the effect of the intensity of steel not substantially, when content is higher than 0.080%, then the plasticity of steel, toughness and can be reduced
Weldability, and the banded structure rank in steel can be aggravated.Therefore the content of C is controlled to 0.050 ~ 0.080% in the present invention.
Si：The main intensity that steel is improved with solution strengthening form of Si, while be also the deoxidant element in steel, but content is too low
Shi Qianghua DeGrains, it is again unfavorable to the toughness of steel during too high levels.Therefore in the present invention content of Si be controlled to 0.30 ~
0.45%。
Mn：Mn is important solution strengthening element in steel, beneficial to the intensity and low-temperature flexibility that improve steel.But its too high levels
When, component segregation is serious in causing its steel, and then hard crisp pearlite or M/A banded structures are formed in promotion steel, are deteriorated
The resistance to H of steel2S corrosive natures.Meanwhile, Mn contents high are easy to promote the generation of MnS ribbon field trashes, as diffusible hydrogen in steel
Aggregation ground, easily induce hydrogen induced cracking (HIC).Therefore the content of Mn is controlled to 0.85 ~ 0.10% in the present invention.
Mo：Mo can expand austenite phase transformation area, improve the quenching degree of steel, improve even tissue of the steel in thickness x cross sectional
Property.Meanwhile, the addition of Mo makes steel that equally distributed M/A tissues are readily available under relatively low cooling rate, improves the strength character of steel.
There is Mo elements the Strengthening and Toughening similar to Mn elements to act on, and the addition of Mo avoids Mn contents high in steel, and then avoids steel
Middle banded structure deteriorates, and improves the resistance to H of steel2S corrosive natures.Therefore Mo contents are controlled to 0.10 ~ 0.20% in the present invention.
Nb：Nb has strong Grain Refinement Effect and medium precipitation strength effect in course of hot rolling, can postpone Austria
Family name's body is recrystallized, and is caused the refinement of austenite crystal and phase-change product and is improved the obdurability of steel.In normalizing procedure, solid solution in steel
Nb elements by solute drageffect prevent austenite crystal excessively growing up, can obtain degree of grain refinement during hot rolling
To largely heredity, and Nb elements are separated out in second phase particles form in normalizing cooling procedure, improve the strong of normalized steel
Degree.Nb contents are controlled to 0.06 ~ 0.12% in the present invention.
P, sulphur S：P can reduce the low-temperature flexibility of steel, deteriorate welding performance, and the P easily segregations in steel, promote banding group
The generation knitted, is unfavorable for the resistance to H of steel2S etching characteristics.S easily forms strip MnS and is mingled with Mn, in the same of influence steel toughness
When, hydrogen atom tends to assemble at MnS tips, so as to induce H2S corrosion crackings.Therefore, the present invention should try one's best and reduce containing for P, S
To reduce its adverse effect to steel, the content of P is controlled to P≤0.010% to amount, and the content of S is controlled to S≤0.0020%.
In view of user to the common demands of pipeline steel chemical composition, B and RE elements are not deliberately added in the present invention, and will
Ask B≤0.0005%, RE≤0.0005%.
The present invention takes into account the normalizing state pipe line steel of high-strength tenacity and excellent anticorrosive performance to obtain, except entering to chemical composition
Outside row optimization design, also in hot rolling stage（Roughing, finish rolling, cooling etc.）With the normalizing stage（Temperature, time, cooling rate etc.）Production
Technique has carried out targeted design.Specific design thinking is as follows：
Why the present invention uses the low Mn systems of low C+ to reduce the formation trend of banded structure in steel, while after using hot rolling
Fast cooling technology suppresses diffusion and the Local enrichment of phase transformation stage C element, to improve the decay resistance of steel.
Why the present invention adds appropriate solution strengthening Mo elements, with promoting relatively low cooling rate（Normalizing is cooled down）It is hard in steel
The transformation of phase constitution, improves the strength character of normalized steel.
Why the present invention is produced using the carrying out of the low C of TMCP+ Nb technologies high, by sufficient recrystallization softening and not again
Crystalline dislocations density is accumulated, to promote the Nb elements of solid solution in austenite in the form of NbC in dislocation and grain boundaries disperse educt,
And then for normalizing stage austenite crystal forming core provides advantage, so as to realize austenite crystal refinement and normalized steel it is strong
Toughness improves.
Why the present invention controls normalizing temperature and soaking time, and crystal grain mistake is avoided while complete austenitizing is ensured
Degree is grown up, in order to avoid deteriorate the intensity and toughness of normalized steel.
Why the present invention is when the cooling velocity in control normalizing cooling procedure, it is to avoid occur because the cooling of thickness of slab center is slow
The hard phase constitution of ribbon, so severe exacerbation steel corrosion resistance.
The present invention compared with prior art, outside with high intensity, high tenacity and good weldability, that is, is surrendered strong
Degree Rt0.5 >=415MPa, tensile strength Rm>=520MPa, -30 DEG C of ballistic work KV2≥200J（Full-scale specification）, -30 DEG C
DWTT section shearing rate SA >=90%.
Meanwhile, the present invention has excellent resistance to H in NACE and solution A2S corrosive natures.It is embodied in, according to
The standards of NACE TM 0284, carry out HIC inspections, the crack length rate CLR of normalizing pipe line steel sample section, crackle in solution A
Thickness rate CTR, crackle area occupation ratio CSR values are 0, i.e. sample section flawless；According to the standards of NACE TM 0177, in solution A
In be respectively adopted four-point bending method and constant load tensile carries out SSCC inspections, normalizing pipeline steel curved beam is 0.80 in loaded load
Do not observe crackle under × actual yield strength load-up condition.
The straight-line joint submerged arc welding tube that can be used for more than L415N ranks into the normalizing pipe line steel for producing using mentioned component and technique
Manufacture and production.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of steel plate of the present invention.
Specific embodiment
The present invention is described in detail below：
Table 1 is the chemical composition list 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 the tensile property and quality of coating experiment result list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention follow the steps below production：
1）To heating strand after continuous casting, its heating-up temperature is controlled at 1100 ~ 1150 DEG C；
2）Roughing is carried out, and it is 1020 ~ 1070 DEG C to control roughing end temp；
3）Finish rolling is carried out, and controls its start rolling temperature no more than 950 DEG C, finishing temperature is not less than 860 DEG C；
4）Cooled down, coiling temperature is cooled under the conditions of cooling velocity is not less than 55 DEG C/s；
5）Batched, control coiling temperature is no more than 450 DEG C；
6）Normalizing is carried out, and controls normalizing temperature to be incubated according to 2min/mm at 860 ~ 900 DEG C, and again at a temperature of this, and controlled
Normalizing procedure cooling velocity processed is in 5 ~ 8 DEG C/s.
The various embodiments of the present invention of table 1 and contrast steel chemical composition comparative example（Wt%）
The main technologic parameters value of the embodiment of the present invention of table 2 and comparative example
The various embodiments of the present invention of table 3 and comparative example mechanical property list
Knowable to the data of table 3, the mechanical property and HIC, SSCC performance of the embodiment of the present invention are superior to comparative example.
This specific embodiment is only most preferably to enumerate, not to the restricted implementation of technical solution of the present invention.
Claims (2)
1. a kind of resistance to H2The excellent high tough normalizing pipe line steel of S corrosive natures, its component and weight percent content are：C 0.05~
0.08%, Si 0.30 ~ 0.45%, Mn 0.85 ~ 1.0%, P≤0.010%, S≤0.0020%, Mo 0.10 ~ 0.20%, Nb 0.06 ~
0.12%, B are no more than 0.0005% no more than 0.0005%, RE, and other are Fe and inevitable tramp element；Metallographic structure
For：Ferrite+disperse M/A islands+a small amount of pearlite.
2. a kind of resistance to H as claimed in claim 1 is produced2The method of the excellent high tough normalizing pipe line steel of S corrosive natures, its step
Suddenly：
1）To heating strand after continuous casting, its heating-up temperature is controlled at 1100 ~ 1150 DEG C；
2）Roughing is carried out, and it is 1020 ~ 1070 DEG C to control roughing end temp；
3）Finish rolling is carried out, and controls its start rolling temperature no more than 950 DEG C, finishing temperature is not less than 860 DEG C；
4）Cooled down, coiling temperature is cooled under the conditions of cooling velocity is not less than 55 DEG C/s；
5）Batched, control coiling temperature is no more than 450 DEG C；
6）Normalizing is carried out, and controls normalizing temperature to be incubated according to 2min/mm at 860 ~ 900 DEG C, and again at a temperature of this, and controlled
Normalizing procedure cooling velocity processed is in 5 ~ 8 DEG C/s.
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|---|---|---|---|
| CN201611073339.XA CN106756537B (en) | 2016-11-29 | 2016-11-29 | A kind of resistance to H2The excellent tough normalizing pipe line steel of height of S corrosive nature and production method |
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| CN201611073339.XA CN106756537B (en) | 2016-11-29 | 2016-11-29 | A kind of resistance to H2The excellent tough normalizing pipe line steel of height of S corrosive nature and production method |
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| CN106756537A true CN106756537A (en) | 2017-05-31 |
| CN106756537B CN106756537B (en) | 2019-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254362A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
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| CN105624554A (en) * | 2016-01-15 | 2016-06-01 | 宝山钢铁股份有限公司 | Steel plate for 70-grade SA671 electric fusion welding pipe with excellent HIC resistance and manufacturing method |
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| CN103649351A (en) * | 2011-06-30 | 2014-03-19 | 杰富意钢铁株式会社 | High strength hot-rolled steel sheet for welded steel line pipe having excellent souring resistance, and method for producing same |
| CN102392185A (en) * | 2011-10-28 | 2012-03-28 | 首钢总公司 | Normalized acid resistant hot-rolled steel plate and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254362A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
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