CN110284066A - A kind of thin gauge low-yield ratio pipeline steel and its manufacturing method - Google Patents
A kind of thin gauge low-yield ratio pipeline steel and its manufacturing method Download PDFInfo
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- CN110284066A CN110284066A CN201910672394.8A CN201910672394A CN110284066A CN 110284066 A CN110284066 A CN 110284066A CN 201910672394 A CN201910672394 A CN 201910672394A CN 110284066 A CN110284066 A CN 110284066A
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- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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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
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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
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- 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
- C21D2211/002—Bainite
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Abstract
The present invention relates to a kind of thin gauge low-yield ratio pipeline steel and its manufacturing methods, the chemical component weight content of the steel plate are as follows: C:0.04-0.06%, Si:0.2-0.3%, Mn:1.66-1.74%, P:0-0.012%, S:0-0.02%, Cr:0.13-0.19%, Nb:0.035-0.045%, Ti:0.0115-0.0175%, Ca:0.001-0.0035%, Al:0.02-0.04%, surplus is Fe and inevitable micro impurity element, and above-mentioned element need to meet following relationship: V+Nb+Ti≤0.15% simultaneously；The production method of the pipe line steel includes the following steps: S1, smelting, casting；S2, heating；S3, rolling and cooling；S4, aligning.The thermo-mechanical rolling technique of present invention combination controlled rolling and control cooling, obtain the steel plate of TMCP state, full plate thickness obtains the microscopic structure based on bainite to improve the low-temperature flexibility of steel, there are high-intensitive, low yield strength ratio Mechanical Characteristics simultaneously, especially through thickness tension test yield tensile ratio≤90%, whole yield tensile ratio≤87% have good comprehensive mechanical property, and carbon equivalent is lower, is conducive to improve steel pipe forming welding and site girth welding welding performance.
Description
Technical field
The invention belongs to Plate Production technical fields, and in particular to a kind of thin gauge low-yield ratio pipeline steel and its manufacturer
Method.
Background technique
Domestic pharmaceutical industry prior art key is to reduce the in the wrong strong of pipe line steel thin gauge by adjusting ingredient and cooling technique
Than, if Anshan iron and steel plant, Ma Gangdeng steel mill are by reducing C, increase Mn, reduce finishing temperature to reducing yield tensile ratio, at present the technology by
Domestic more steel mills are widely used, and Nangang then changes the tissue of steel plate by the way of reducing finishing temperature, at present the technology
There is the use of small part steel mill.
Domestic many enterprises attempt to reduce yield tensile ratio as starting point from the angle of optimization technique, main to increase pro-eutectoid iron
Ferritic ratio and increase ferrite grain size size etc. meet the requirement of low yield strength ratio, but as the reduction of yield tensile ratio can shadow
The yield strength and tensile strength of steel plate itself are rung, therefore for petroleum, natural gas transportation and various regional pipe-line constructions etc.
Under environment, the steel plate of thin gauge and low yield strength ratio can not be provided.
Summary of the invention
The purpose of the invention is to provide a kind of thin gauge low-yield ratio pipeline steel and its manufacturing method, which is
The pipe line steel of thin gauge low yield strength ratio yield strength 485MPa, finished steel plate thickness 12-15mm, the microscopic structure of the steel is with bayesian
Based on body, yield strength >=485MPa, tensile strength >=580MPa, full-scale Charpy-V impact power transition temperature is at -60 DEG C, entirely
Plate thickness DWTT Percentage of Shear Fracture For Fracture Surface transition temperature has manufacturability, can be used for manufacturing thin-walled straight-line joint submerged arc welding tube at -30 DEG C.
For realize foregoing invention purpose, the technical solution adopted by the present invention is as follows:
A kind of thin gauge low-yield ratio pipeline steel and its manufacturing method, the chemical component weight content of the pipe line steel are as follows: C:C
It is most basic intensified element, C, which is dissolved in steel, forms interstitial solid solution, plays solution strengthening, is formed with strong carbide
Element forms Carbide Precipitation, then plays the role of precipitation strength.But too high C is unfavorable to the toughness and welding performance of steel；C is too
Intensity that is low and reducing steel.Therefore, it is 0.04-0.06% that the present invention, which controls C content,；
Si:Si is solution strengthening element, while being also the deoxidant element in steel, but too high levels can deteriorate the welding of steel
Performance, while being unfavorable for hot rolling iron scale in the operation of rolling and removing, therefore, the present invention controls Si content in 0.2-0.3%；
Mn:Mn improves the intensity of steel by solution strengthening, is to compensate to cause loss of strength most because C content reduces in steel
Mainly, economic intensified element.Mn still expands the element of γ phase region, can reduce γ → α phase transition temperature of steel, help to obtain
The toughness of steel can be improved in tiny phase-change product；But Mn is easy segregation element, when Mn content is higher, the Mn in casting process
The martensitic structure of hard phase is easily generated after the completion of plate thickness center segregation, rolling, the low-temperature flexibility and anti-dynamic for reducing material are torn
Fragility energy.Therefore, it is 1.66-1.74% that the present invention, which controls Mn content,；
Cr:Cr is the important element for improving the harden ability of steel, it is ensured that the tissue and performance of thick steel plates through thickness are uniform
Property, and Cr content can effectively improve the corrosion resistance of steel at 0.10% or more；But steel is added simultaneously in too high chromium and manganese
In, it will lead to low melting point Cr-Mn composite oxides and formed, form face crack in hot procedure, while can severe exacerbation
Welding performance.Therefore, Cr content is limited to 0.13-0.19% in the present invention；
Nb:Nb is one of important element of low-carbon micro steel-alloy, and the Nb strain induced precipitate being dissolved in course of hot rolling is formed
Nb (N, C) particle, pinning crystal boundary inhibit the generation of deformed austeaite grown up and inhibit recrystallization, through controlled rolling and control cold
But making deformed austeaite mutually becomes the tiny product with high dislocation density.For think gauge pipe line steel, too low Nb
Content disperse educt effect is unobvious, does not have refinement crystal grain, strengthens matrix effect；Too high Nb content, due to inhibiting steel
The generation of plate core portion recrystallization, is unfavorable for crystal grain refinement.And the solid solution of Nb is related with C content, the too high Nb solid solution capacity of C content is few,
Precipitation strength and crystal grain downslide effect can not be played；C content is too low to will lead to grain-boundary weakness, the too low then precipitation strength effect of Nb content
Fruit is unobvious.Therefore, Nb content should be limited to 0.035-0.045% in the present invention；
Ti:Ti is a kind of strong carbonitride-forming elements, and the not molten carbonitride of Ti can be hindered when steel heats
Only austenite grain is grown up, and Austenite Grain Growth can be effectively suppressed in the TiN being precipitated when roughing in high temperature austenite area.In addition
In the welding process, the TiN particle in steel can significantly prevent heat affected area crystal grain from growing up, same so as to improve the welding performance of steel plate
When to improve welding heat affected zone impact flexibility have obvious effect.Therefore, Ti content is controlled in 0.0115- in the present invention
0.0175%；
S, P:S, P are inevitable impurity elements in steel, it is desirable to more lower better.By super-low sulfur (be less than 20ppm) and
Ca processing carries out inclusion morphology control to sulfide, while controlling 0.012% or less P content, it is ensured that invention steel has good
Good low-temperature impact toughness；
Ca: handling the form that can control sulfide by Ca, improves the anisotropy of steel plate, improves low-temperature flexibility, is
The control range for ensuring optimum efficiency Ca is 0.0010-0.0035%；
Al:Al is that the element in steel is added for deoxidation, adds suitable Al and is conducive to refine crystal grain, improves steel
Toughness and tenacity, the present invention in Al content control range be 0.02-0.04%；
Surplus is Fe and inevitable impurity, and meets following relationship: V+Nb+Ti≤0.15%.
The manufacturing method following steps of the steel plate:
S1, smelting, casting: being poured according to mentioned component, remaining is that Fe and inevitable impurity are smelted in converter, then
By the dual refining desulfuration of LF+RH, dehydrogenation, then carry out conticaster casting；
S2, heating: being heated using slab, and heating temperature range is 1150-1190 DEG C；
S3, rolling and cooling: the rolling includes roughing and finish rolling, and steel plate need to be completed whole in austenite perfect recrystallization area
The rough rolling process of a rolling is down to austenite not to temperature then to carry out in delay table to temperature to temperature thickness 4.2-5.5T
Finishing mill rolling is carried out behind recrystallization zone, start rolling temperature is set in 980-1020 DEG C, and finishing temperature is set in 840-880 DEG C；For
Guarantee that steel plate has sufficient intensity and toughness, increase water-spraying control technique in controlled rolling stage back, makes to organize crystal grain further after rolling
Refinement, and be evenly distributed, cold temperature control is opened at 770-810 DEG C, and cooling rate is in 30-45 DEG C/S, and final cooling temperature is in 500-560
℃；
S4, aligning: 1 passage of pre-straightening sets roll gap 11-13mm, thermal straightening 1 or 3 passages, sets roll gap 9-11mm.
Further, the microscopic structure of the pipe line steel uses bainite, and effective mean grain size is 11 grades.
Compared with prior art:
1, the present invention is effective controls shearing area rate of dropping hammer, and a properties percent of pass is more than 99%, in alloying element only
Containing Mn, Al and a small amount of Cr, Nb element, improves segregation instead of metal Mo element in the prior art, improves toughness, in alloy
It is substantially reduced in cost.
2, the thermo-mechanical rolling technique cooling in conjunction with controlled rolling and control, obtains the steel plate of TMCP state, full plate thickness obtains
Microscopic structure based on bainite has high-intensitive, low yield strength ratio mechanical property special to improve the low-temperature flexibility of steel
Sign, especially through thickness tension test yield tensile ratio≤90%, whole yield tensile ratio≤87%.
3, the 12-15mm think gauge Pipeline Steel Properties produced reach claimed below: yield strength Rt0.5:485-
630MPa；Tensile strength Rm:580-720MPa；- 15 DEG C full-scale Charpy-V impact power AKv: >=350J；- 15 DEG C of full plate thickness DWTT
(Drop Weight TearTest, drop weight tearing test) performance: Percentage of Shear Fracture For Fracture Surface rate SA: >=85%.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of finished steel plate made of the embodiment of the present invention 1；
Fig. 2 is the metallographic structure figure of finished steel plate made of the embodiment of the present invention 2.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Embodiment 1
Design of Chemical Composition: following chemical component: C:0.04-0.06%, Si:0.2- is designed according to mass percent
0.3%, Mn:1.66-1.74%, P:0-0.012%, S:0-0.02%, Cr:0.13-0.19%, Nb:0.035-0.045%,
Ti:0.0115-0.0175%, Ca:0.001-0.0035%, Al:0.02-0.04%, remaining for Fe and inevitably it is miscellaneous
Matter.
It in conjunction with shown in table 1, table 2, step 1, smelts, casting: casting to the chemical component of design, first stirred through KR de-
Sulphuring treatment, then blow in converter, then by the dual refining desulfuration of LF+RH, dehydrogenation, finally carries out conticaster casting and obtain plate
Base；Slab calculated thickness is 227mm.
Step 2, it heats: slab being heated, heating temperature is set as 1130-1170 DEG C, and heating time is greater than
160min (under this heating condition, can guarantee the abundant solid solution and precipitation strength of Nb element).
Step 3, roll and cooling: rolling experience roughing and finish rolling, steel plate need to be completed whole in austenite perfect recrystallization area
The rough rolling process of a rolling is carried out to temperature thickness in delay table after roughing using 4.2-5.5T (T is finished steel plate thickness)
To temperature, finishing mill rolling is carried out after temperature is down to austenite Unhydrated cement, start rolling temperature is set in 980-1020 DEG C, finish to gauge
Temperature is set in 830-870 DEG C, to guarantee that steel plate has sufficient intensity and toughness, increases water-spraying control work in controlled rolling stage back
Skill makes to organize crystal grain further to refine after rolling, and is evenly distributed, and opens cold temperature control at 760-800 DEG C, cooling velocity exists
28-32 DEG C/S, final cooling temperature is at 500-560 DEG C.
Step 4, align: 1 passage of pre-straightening sets roll gap 13-15mm, thermal straightening 1 or 3 passages, sets roll gap 11-
13mm。
12-15mm think gauge pipeline is finally obtained, tensile property: yield strength Rt0.5:622MPa；Tensile strength Rm:
690MPa；Elongation percentage A:32%；Yield tensile ratio YR:90%；
- 15 DEG C of full-scale Charpy-V impact power AKv:433J；The fracture of -15 DEG C of full plate thickness DWTT (drop weight tearing test) performances
Section of shear rate SA:97%.
Embodiment 2
Design of Chemical Composition: following chemical component: C:0.04-0.06%, Si:0.2- is designed according to mass percent
0.3%, Mn:1.66-1.74%, P:0-0.012%, S:0-0.02%, Cr:0.13-0.19%, Nb:0.035-0.045%,
Ti:0.0115-0.0175%, Ca:0.001-0.0035%, Al:0.02-0.04%, remaining for Fe and inevitably it is miscellaneous
Matter.
It in conjunction with shown in table 1, table 2, step 1, smelts, casting: casting to the chemical component of design, first stirred through KR de-
Sulphuring treatment, then blow in converter, then by the dual refining desulfuration of LF+RH, dehydrogenation, finally carries out conticaster casting and obtain plate
Base；Slab calculated thickness is 227mm.
Step 2, it heats: slab being heated, heating temperature is set as 1130-1170 DEG C, and heating time is greater than
160min (under this heating condition, can guarantee the abundant solid solution and precipitation strength of Nb element).
Step 3, roll and cooling: rolling experience roughing and finish rolling, steel plate need to be completed whole in austenite perfect recrystallization area
The rough rolling process of a rolling is carried out to temperature thickness in delay table after roughing using 4.2-5.5T (T is finished steel plate thickness)
To temperature, finishing mill rolling is carried out after temperature is down to austenite Unhydrated cement, start rolling temperature is set in 980-1020 DEG C, finish to gauge
Temperature is set in 830-870 DEG C, to guarantee that steel plate has sufficient intensity and toughness, increases water-spraying control work in controlled rolling stage back
Skill makes to organize crystal grain further to refine after rolling, and is evenly distributed, and opens cold temperature control at 760-800 DEG C, cooling velocity exists
28-32 DEG C/S, final cooling temperature is at 500-560 DEG C.
Step 4, align: 1 passage of pre-straightening sets roll gap 11-13mm, thermal straightening 1 or 3 passages, sets roll gap 9-11mm.
12-15mm think gauge pipeline is finally obtained, tensile property: yield strength Rt0.5:527MPa；Tensile strength Rm:
634MPa；Elongation percentage A:38%；Yield tensile ratio YR:83%；
- 15 DEG C of full-scale Charpy-V impact power AKv:446J；The fracture of -15 DEG C of full plate thickness DWTT (drop weight tearing test) performances
Section of shear rate SA:98%.
In conclusion the present invention is a kind of to roll state steel plate and its manufacturing method with low-temperature impact toughness, can be met
Target performance requirement pipe line steel has good comprehensive mechanical property, and carbon equivalent is lower, is conducive to improve steel pipe forming welding
And site girth welding welding performance, ingredient is simple, and process window is wider, has stronger manufacturability.
Table 1: the design parameter of embodiment 1 and embodiment 2 comparison
Table 2: the experimental performance of embodiment 1 and embodiment 2 comparison
Claims (2)
1. a kind of thin gauge low-yield ratio pipeline steel, which is characterized in that the steel plate chemical component weight content are as follows: C:0.04-
0.06%, Si:0.2-0.3%, Mn:1.66-1.74%, P:0-0.012%, S:0-0.02%, Cr:0.13-0.19%, Nb:
0.035-0.045%, Ti:0.0115-0.0175%, Ca:0.001-0.0035%, Al:0.02-0.04%, surplus be Fe with
And inevitable impurity, and meet following relationship: V+Nb+Ti≤0.15%；The manufacturing method following steps of the pipe line steel:
S1, smelting, casting: being poured according to the pipeline steel chemical composition, remaining is Fe and inevitable the impurity smelting in converter
Refining then by the dual refining desulfuration of LF+RH, dehydrogenation, then carries out conticaster casting and obtains slab；
S2, heating: slab heating temperature is set as 1150-1190 DEG C；
S3, rolling and cooling: the rolling includes roughing and finish rolling, and steel plate completes entire rolling in austenite perfect recrystallization area
Rough rolling process be down to austenite non-recrystallization to temperature then to carry out in delay table to temperature to temperature thickness 4.2-5.5T
Finishing mill rolling is carried out behind area, start rolling temperature is set in 980-1020 DEG C, and finishing temperature is set as 840-880 DEG C；The cooling
For water-spraying control technique is arranged after the controlled rolling stage, opening cold temperature is 770-810 DEG C, and cooling rate is 30-45 DEG C/S, and final cooling temperature exists
500-560℃；
S4, aligning: 1 passage of pre-straightening sets roll gap 11-13mm, thermal straightening 1 or 3 passages, sets roll gap 9-11mm.
2. a kind of thin gauge low-yield ratio pipeline steel as described in claim 1 and its manufacturing method, which is characterized in that the pipe
The microscopic structure of line steel uses bainite, and effective mean grain size is 11 grades.
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Cited By (4)
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| CN112246910A (en) * | 2020-09-15 | 2021-01-22 | 首钢集团有限公司 | Method for improving performance uniformity of thermomechanically-rolled steel plate and thermomechanically-rolled steel plate |
| CN112322995A (en) * | 2020-11-11 | 2021-02-05 | 江苏省沙钢钢铁研究院有限公司 | Low-yield-ratio high-toughness TMCP (thermal mechanical control processing) type bridge steel plate and production method thereof |
| WO2021109439A1 (en) * | 2019-12-07 | 2021-06-10 | 江阴兴澄特种钢铁有限公司 | Hic-resistant and large deformation-resistant pipeline steel and preparation method therefor |
| CN116334497A (en) * | 2023-03-22 | 2023-06-27 | 江苏省沙钢钢铁研究院有限公司 | Steel plate with low yield ratio and long strain fatigue life and production method thereof |
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| CN116334497A (en) * | 2023-03-22 | 2023-06-27 | 江苏省沙钢钢铁研究院有限公司 | Steel plate with low yield ratio and long strain fatigue life and production method thereof |
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