CN107739990A - Surrender 260MPa levels sour environment military service Pipeline Steel Plate and its production method - Google Patents

Surrender 260MPa levels sour environment military service Pipeline Steel Plate and its production method Download PDF

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Publication number
CN107739990A
CN107739990A CN201710819053.XA CN201710819053A CN107739990A CN 107739990 A CN107739990 A CN 107739990A CN 201710819053 A CN201710819053 A CN 201710819053A CN 107739990 A CN107739990 A CN 107739990A
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China
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steel plate
surrender
rolling
260mpa
military service
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Inventor
张志军
邓建军
赵文忠
李�杰
韦明
龙杰
王青
高雅
徐腾飞
王晓书
谷盟森
耿宽宽
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Wuyang Iron and Steel Co Ltd
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Wuyang Iron and Steel Co Ltd
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Priority to CN201710819053.XA priority Critical patent/CN107739990A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/002Bainite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

Abstract

The invention discloses one kind surrender 260MPa levels sour environment military service Pipeline Steel Plate and its production method, steel plate chemical composition composition and weight/mass percentage composition are:C:0.03 0.06%, Si:0.20 0.40%, Mn:0.80 1.0%, P≤0.010%, S≤0.002%, Nb:0.020 0.040%, Cr:0.10 0.20%, Alt:0.020 0.040%, surplus is Fe and inevitable impurity;The production method includes smelting, continuous casting, heating, rolling, refrigerating work procedure.Steel plate of the present invention has low-carbon-equivalent, low-welding crack Sensitivity Index, with good decay resistance, the complex tissue of ferrite, bainite, pearlite, the 450MPa of yield strength 370 are obtained using cooling controlling and rolling controlling process, tensile strength 440 500MPa, 20 DEG C of ballistic work >=150J.

Description

Surrender 260MPa levels sour environment military service Pipeline Steel Plate and its production method
Technical field
The invention belongs to metallurgical technology field, and in particular to one kind surrender 260MPa levels sour environment military service Pipeline Steel Plate and Its production method.
Background technology
As China's rapid development of economy is brought to the rapid growth using oil and natural gas as main energy demand, Huge oil and natural gas equal energy source breach can only be by finding new resource from input overseas or within the border and improving oil Production technique is supplemented, it is therefore desirable to which substantial amounts of high added value, high-level oil and gas transmission are managed.In recent years, west is passed through The construction of gas east defeated a line, two wires, China worldwide realizes in heavy caliber, high pressure, high-grade pipe technical elements From pursuing to leading.
The main reason for corrosion is pipeline accident, and hydrogen sulfide corrosion is main cause, statistics shows, is containing wet H2S Jie Under matter effect, oil-gas pipeline easily produces hydrogen sulfide corrosion.Hydrogen sulfide corrosion mainly has two kinds of forms, i.e. hydrogen induced cracking (HIC) and stress Corrosion cracking.In order to prevent hydrogen-type corrosion, provide in the world, work as H2When S partial pressures reach 300Pa, used tubing need to have anti- The performance of sour corrosion, the in such a case carbon content of pipe line steel, Ca/S, flaw detection have special requirement, it is desirable to are HIC (Resistance against hydrogen cracking)And SSCC(Resistance against sulfide stress cracking)Experiment.Because acid-resistant pipeline steel plate belongs to high added value pipe line steel Before plate, production difficulty is larger, has fairly high profit, therefore exploitation sour environment military service Pipeline Steel Plate product has preferable market Scape.
The content of the invention
The technical problem to be solved in the present invention is to provide one kind to surrender 260MPa level sour environment military service Pipeline Steel Plates;This hair It is bright to additionally provide a kind of production method of surrender 260MPa level sour environment military service Pipeline Steel Plates.
In order to solve the above technical problems, the present invention adopts the technical scheme that:One kind surrender 260MPa levels sour environment clothes Pipeline Steel Plate is used as a servant, the steel plate chemical composition composition and its weight/mass percentage composition are:C:0.03-0.06%, Si:0.20-0.40%, Mn:0.80-1.0%, P≤0.010%, S≤0.002%, Nb:0.020-0.040%, Cr:0.10-0.20%, Alt:0.020- 0.040%, surplus is Fe and inevitable impurity;Ceq:0.19-0.27%.
The complex tissue for being organized as ferrite, bainite and pearlite of steel plate of the present invention;Grain size >=8 grade, band Shape tissue≤2 grade.
Steel plate maximum gauge of the present invention is 40mm.
Steel plate yield strength 370-450MPa of the present invention, tensile strength 440-500MPa, elongation percentage >=30%, Qu Qiang Than 0.87-0.93, -20 DEG C of ballistic work >=150J.
Present invention also offers a kind of production method of surrender 260MPa level sour environment military service Pipeline Steel Plates, methods described Including smelting, continuous casting, heating, rolling, refrigerating work procedure;The rolling process, using recrystallization zone+Unhydrated cement two benches Controlled rolling process.
Heating process of the present invention, 1240-1250 DEG C of the maximum heating temperature of steel billet, 1200-1220 DEG C of soaking temperature, Total heat time >=220min, soaking zone time inside furnace >=60min.
Rolling process of the present invention, using recrystallization zone+Unhydrated cement two benches controlled rolling process, the first stage rolls Temperature processed is 1000~1100 DEG C, and single pass rolling reduction is 10~20%, and it is 30~50% to add up reduction ratio;Second stage rolling temperature Spend for 910~930 DEG C, it is 30~50% to add up reduction ratio.
Refrigerating work procedure of the present invention, ACC water coolings are carried out after rolling, it is 760-780 DEG C to enter coolant-temperature gage, red temperature 620~ 650℃。
Smelting procedure of the present invention, molten steel are sent into LF refining furnace refining first through electric furnace smelting, feed Al lines during refining 1.2-1.4kg/t steel;Liquid steel temperature reaches 1530-1550 DEG C and is transferred to VD stove Fruit storages, is added before Fruit storage CaSi block 1.0-1.5kg/t steel change inclusion morphology, vacuum≤66.6Pa of Fruit storage, the vacuum retention time >= 20min。
Continuous casting working procedure of the present invention, become a useful person using 200mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm
Present component mentality of designing is as follows:
Carbon, manganese solution strengthening;Appropriate Nb crystal grain thinnings are added, its carbonitride plays dispersion-strengthened action;Pass through subsequent fine Accurate cooling controlling and rolling controlling process, makes steel plate have good mechanical property.Wherein, the effect of each component and content in the present invention It is:
C:Surrender of the carbon on steel, tensile strength, welding performance make a significant impact, and carbon can significantly improve steel plate by gap solid solution Intensity, but carbon content is too high, can influence the welding performance and toughness of steel again.
Si:Reducing agent and deoxidier are used as in steelmaking process, while Si can also play solution strengthening effect, but exceed When 0.5%, the toughness of steel can be caused to decline, reduce the welding performance of steel.
Mn:Manganese cost is cheap, can increase the toughness, intensity and hardness of steel, improves the quenching degree of steel, improves the hot-working of steel Performance;Manganese amount is too high, center segregation easily occurs for big thickness steel plate.
P、S:In general, p and ses are all harmful elements in steel, increase the fragility of steel, and phosphorus becomes welding performance It is bad, reduce plasticity;Sulphur reduces the ductility and toughness of steel, and crackle is caused in rolling;Therefore it should try one's best and reduce p and ses in steel In content.
Al:Aluminium is the deoxidier commonly used in steel, adds a small amount of aluminium in steel, can crystal grain thinning, improve impact flexibility.Aluminium is also With inoxidizability and corrosion resistance, too high hot-working character, welding performance and the machinability for then influenceing steel.
Nb:In order to promote the crystal grain refinement of steel rolling microscopic structure, intensity and toughness can be improved simultaneously, and niobium can be in controlled rolling By suppressing austenite recrystallization, effective refinement microstructure in journey, and pass through precipitation strength matrix.In welding process, niobium The segregation of atom and precipitation can hinder the roughening of austenite crystal during heating, and obtain relatively fine hot shadow after ensureing welding Ring district's groups to knit, improving welding property.
Cr:Quenching degree and solution strengthening can be improved, ensures armor plate strength, but steel plate toughness is decreased, therefore can To be required according to obdurability, it is determined that rational Cr contents.
Present invention surrender 260MPa level sour environment military service Pipeline Steel Plates detection method refers to API 5L PSL2.
It is using beneficial effect caused by above-mentioned technical proposal:1st, Design of Chemical Composition of the present invention uses low C, ensures Steel plate good weldability and corrosion resistance.2nd, the present invention is designed using Nb microalloyings, is aided with the alloying elements such as Cr, it is ensured that steel Plate intensity, toughness matching.3rd, the present invention there is good Properties of HIC resistance, be organized as ferrite, bainite, pearlite it is compound Tissue.4th, the inventive method produces steel plate by cooling controlling and rolling controlling process, and gained surrender 260MPa level steel plates have good welding Property:Ceq:0.19-0.27%, yield strength 370-450MPa, tensile strength 440-500MPa, yield tensile ratio 0.87-0.93, -20 DEG C Ballistic work >=150J, elongation percentage >=30%, grain size >=8 grade, banded structure≤2 grade.
Brief description of the drawings
Fig. 1 is the micro-organization chart of the steel plate of embodiment 1;
Fig. 2 is the micro-organization chart of the steel plate of embodiment 2;
Fig. 3 is the micro-organization chart of the steel plate of embodiment 3;
Fig. 4 is the micro-organization chart of the steel plate of embodiment 4;
Fig. 5 is the micro-organization chart of the steel plate of embodiment 5;
Fig. 6 is the micro-organization chart of the steel plate of embodiment 6;
Fig. 7 is the HIC assay figures of the steel plate of embodiment 1;
Fig. 8 is the HIC assay figures of the steel plate of embodiment 2;
Fig. 9 is the HIC assay figures of the steel plate of embodiment 3;
Figure 10 is the HIC assay figures of the steel plate of embodiment 4;
Figure 11 is the HIC assay figures of the steel plate of embodiment 5;
Figure 12 is the HIC assay figures of the steel plate of embodiment 6.
Embodiment
Surrendering the production method of 260MPa level sour environment military service Pipeline Steel Plates includes smelting, continuous casting, heating, rolling, cold But process, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al lines 1.2-1.4kg/t during refining Steel;Liquid steel temperature reaches 1530-1550 DEG C and is transferred to VD stove Fruit storages, and CaSi blocks 1.0- is added before Fruit storage 1.5kg/t steel changes inclusion morphology, vacuum≤66.6Pa of Fruit storage, vacuum retention time >=20min;Tapping Ladle chemistry forms and weight/mass percentage composition is:C:0.03-0.06%, Si:0.20-0.40%, Mn:0.80-1.0%, P≤ 0.010%, S≤0.002%, Nb:0.020-0.040%, Cr:0.10-0.20%, Alt:0.020~0.040%, surplus is for Fe and not Evitable impurity;
(2) continuous casting working procedure:Become a useful person using 200mm thickness continuous casting billets, steel billet is heated according to 1.1min/mm;
(3) heating process:1240~1250 DEG C of the maximum heating temperature of steel billet, 1200-1220 DEG C of soaking temperature, total heat time >=220min, soaking zone time inside furnace >=60min;
(4) rolling process:Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtain semi-finished product steel plate; First stage rolling temperature be 1000~1100 DEG C, this stage single pass rolling reduction be 10~20%, add up reduction ratio be 30~ 50%;Second stage rolling temperature is 910~930 DEG C, and it is 30~50% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 760-780 DEG C of coolant-temperature gage, 620~650 DEG C of red temperature;Obtain maximum Thickness is 40mm surrender 260MPa level sour environment military service Pipeline Steel Plates.
With reference to specific embodiments and the drawings, the present invention is further detailed explanation.
Embodiment 1
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plate thickness is 12mm, its chemical composition composition and quality hundred Point content is shown in Table 1.
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plates production method include smelting, continuous casting, heating, Rolling, refrigerating work procedure, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al line 1.2kg/t steel during refining;Steel Coolant-temperature gage reaches 1540 DEG C and is transferred to VD stove Fruit storages, and adding CaSi block 1.3kg/t steel before VD changes inclusion morphology;Very The vacuum 66.6Pa of empty degassing process, vacuum retention time 20min;Ladle chemistry of tapping forms and weight/mass percentage composition It is shown in Table 1;
(2)Continuous casting working procedure:Using the continuous casting billet of 200mm thickness, steel billet is heated according to 1.1min/mm;
(3)Heating process:1250 DEG C of maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 221min, soaking zone is in stove Time 63min;
(4)Rolling process:First stage rolling temperature is 1030 DEG C, single pass rolling reduction 20%, and it is 50% to add up reduction ratio; Second stage rolling temperature is 910 DEG C, and it is 30% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 760 DEG C of coolant-temperature gage, 620 DEG C of red temperature.
The present embodiment surrenders 260MPa level sour environment military service Pipeline Steel Plate yield strength 401MPa, tensile strength 455MPa, yield tensile ratio 0.88, the average 248J of -20 DEG C of ballistic works, elongation percentage 31%, 10 grades of grain size, 1.5 grades of banded structure;
The microscopic structure of steel plate is shown in Fig. 1, and it is organized as the complex tissue of ferrite, bainite and pearlite as seen from Figure 1;Fig. 7 For the HIC assay figures of steel plate;Table 2 is the steel plate HIC assays of embodiment 1(Embodiment 2-6 steel plate HIC assays It is same as Example 1, therefore omit).
Embodiment 2
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plate thickness is 28mm, its chemical composition composition and quality hundred Point content is shown in Table 1.
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plates production method include smelting, continuous casting, heating, Rolling, refrigerating work procedure, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al line 1.3kg/t steel during refining;Steel 1550 DEG C of coolant-temperature gage is transferred to VD stove Fruit storages, and adding CaSi block 1.2kg/t steel before VD changes inclusion morphology;Vacuum takes off The vacuum 66Pa of gas disposal, vacuum retention time 24min;Tapping ladle chemistry composition and weight/mass percentage composition are shown in Table 1;
(2)Continuous casting working procedure:Using the continuous casting billet of 200mm thickness, steel billet is heated according to 1.1min/mm;
(3)Heating process:1245 DEG C of steel billet maximum heating temperature, 1218 DEG C of soaking temperature, total heat time 225min, soaking zone Time inside furnace 65min;
(4)Rolling process:First stage rolling temperature is 1100 DEG C, single pass rolling reduction 10%, and it is 30% to add up reduction ratio; Second stage rolling temperature is 930 DEG C, and it is 30% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 780 DEG C of coolant-temperature gage, 650 DEG C of red temperature.
The present embodiment surrenders 260MPa level sour environment military service Pipeline Steel Plate yield strength 419MPa, tensile strength 463MPa, yield tensile ratio 0.9, the average 193J of -20 DEG C of ballistic works, elongation percentage 33%, 9.5 grades of grain size, 1.5 grades of banded structure;
The microscopic structure of steel plate is shown in Fig. 2, and it is organized as the complex tissue of ferrite, bainite and pearlite as seen from Figure 2;Fig. 8 For the HIC assay figures of steel plate.
Embodiment 3
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plate thickness is 32mm, its chemical composition composition and quality hundred Point content is shown in Table 1.
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plates production method include smelting, continuous casting, heating, Rolling, refrigerating work procedure, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al line 1.4kg/t steel during refining;Steel 1530 DEG C of coolant-temperature gage is transferred to VD stove Fruit storages, and adding CaSi block 1.4kg/t steel before VD changes inclusion morphology;Vacuum takes off The vacuum 60Pa of gas disposal, vacuum retention time 25min;Tapping ladle chemistry composition and weight/mass percentage composition are shown in Table 1;
(2)Continuous casting working procedure:Using the continuous casting billet of 200mm thickness, steel billet is heated according to 1.1min/mm;
(3)Heating process:1240 DEG C of steel billet maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 227min, soaking zone Time inside furnace 62min;
(4)Rolling process:First stage rolling temperature is 1050 DEG C, single pass rolling reduction 15%, and it is 38% to add up reduction ratio; Second stage rolling temperature is 918 DEG C, and it is 40% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 777 DEG C of coolant-temperature gage, 635 DEG C of red temperature.
The present embodiment surrenders 260MPa level sour environment military service Pipeline Steel Plate yield strength 437MPa, tensile strength 470MPa, yield tensile ratio 0.93, the average 237J of -20 DEG C of ballistic works, elongation percentage 34%, 11 grades of grain size, 1.0 grades of banded structure;
The microscopic structure of steel plate is shown in Fig. 3, and it is organized as the complex tissue of ferrite, bainite and pearlite as seen from Figure 3;Fig. 9 For the HIC assay figures of steel plate.
Embodiment 4
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plate thickness is 35mm, its chemical composition composition and quality hundred Point content is shown in Table 1.
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plates production method include smelting, continuous casting, heating, Rolling, refrigerating work procedure, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al line 1.3kg/t steel during refining;Steel 1535 DEG C of coolant-temperature gage is transferred to VD stove Fruit storages, and adding CaSi block 1.5kg/t steel before VD changes inclusion morphology;Vacuum takes off The vacuum 62Pa of gas disposal, vacuum retention time 26min;Tapping ladle chemistry composition and weight/mass percentage composition are shown in Table 1;
(2)Continuous casting working procedure:Using the continuous casting billet of 200mm thickness, steel billet is heated according to 1.1min/mm;
(3)Heating process:1250 DEG C of steel billet maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 339min, soaking zone Time inside furnace 68min;
(4)Rolling process:First stage rolling temperature is 1000 DEG C, single pass rolling reduction 18%, and it is 40% to add up reduction ratio; Second stage rolling temperature is 922 DEG C, and it is 42% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 780 DEG C of coolant-temperature gage, 645 DEG C of red temperature.
The present embodiment surrenders 260MPa level sour environment military service Pipeline Steel Plate yield strength 420MPa, tensile strength 465MPa, yield tensile ratio 0.90, the average 232J of -20 DEG C of ballistic works, elongation percentage 35%, 12 grades of grain size, 0.5 grade of banded structure;
The microscopic structure of steel plate is shown in Fig. 4, and it is organized as the complex tissue of ferrite, bainite and pearlite as seen from Figure 4;Figure 10 For the HIC assay figures of steel plate.
Embodiment 5
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plate thickness is 38mm, its chemical composition composition and quality hundred Point content is shown in Table 1.
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plates production method include smelting, continuous casting, heating, Rolling, refrigerating work procedure, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al line 1.4kg/t steel during refining;Steel Coolant-temperature gage reaches 1545 DEG C and is transferred to VD stove Fruit storages, and adding CaSi block 1.2kg/t steel before VD changes inclusion morphology;Very The vacuum 65Pa of empty degassing process, vacuum retention time 30min;Tapping ladle chemistry composition and weight/mass percentage composition are shown in Table 1;
(2)Continuous casting working procedure:Using the continuous casting billet of 200mm thickness, steel billet is heated according to 1.1min/mm;
(3)Heating process:1248 DEG C of steel billet maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 220min, soaking zone Time inside furnace 65min;
(4)Rolling process:First stage rolling temperature is 1080 DEG C, single pass rolling reduction 12%, and it is 32% to add up reduction ratio; Second stage rolling temperature is 916 DEG C, and it is 50% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 778 DEG C of coolant-temperature gage, 644 DEG C of red temperature.
The present embodiment surrenders 260MPa level sour environment military service Pipeline Steel Plate yield strength 428MPa, tensile strength 465MPa, yield tensile ratio 0.92, the average 262J of -20 DEG C of ballistic works, elongation percentage 33%, 8 grades of grain size, 2 grades of banded structure;
The microscopic structure of steel plate is shown in Fig. 5, and it is organized as the complex tissue of ferrite, bainite and pearlite as seen from Figure 5;Figure 11 For the HIC assay figures of steel plate.
Embodiment 6
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plate thickness is 40mm, its chemical composition composition and quality hundred Point content is shown in Table 1.
The present embodiment surrender 260MPa level sour environment military service Pipeline Steel Plates production method include smelting, continuous casting, heating, Rolling, refrigerating work procedure, specific production technology are as described below:
(1)Smelting procedure:Molten steel is sent into LF refining furnace refining first through electric furnace smelting, feeds Al line 1.2kg/t steel during refining;Steel Coolant-temperature gage reaches 1540 DEG C and is transferred to VD stove Fruit storages, and adding CaSi block 1.0kg/t steel before VD changes inclusion morphology;Very The vacuum 64Pa of empty degassing process, vacuum retention time 25min;Tapping ladle chemistry composition and weight/mass percentage composition are shown in Table 1;
(2)Continuous casting working procedure:Using the continuous casting billet of 200mm thickness, steel billet is heated according to 1.1min/mm;
(3)Heating process:1243 DEG C of maximum heating temperature, 1200 DEG C of soaking temperature, total heat time 338min, soaking zone is in stove Time 60min;
(4)Rolling process:First stage rolling temperature is 1040 DEG C, single pass rolling reduction 14%, and it is 45% to add up reduction ratio; Second stage rolling temperature is 917 DEG C, and it is 36% to add up reduction ratio;
(5)Refrigerating work procedure:ACC water coolings are carried out after rolling, enter 776 DEG C of coolant-temperature gage, 649 DEG C of red temperature.
The present embodiment surrenders 260MPa level sour environment military service Pipeline Steel Plate yield strength 390MPa, tensile strength 447MPa, yield tensile ratio 0.87, the average 243J of -20 DEG C of ballistic works, elongation percentage 32%, 12 grades of grain size, 1.0 grades of banded structure;
The microscopic structure of steel plate is shown in Fig. 6, and it is organized as the complex tissue of ferrite, bainite and pearlite as seen from Figure 6;Figure 12 For the HIC assay figures of steel plate.
The embodiment 1-6 steel plates of table 1 and tapping ladle chemistry composition and weight/mass percentage composition(%)
In table 1, the surplus of chemical composition is Fe and inevitable impurity.
The HIC assays of the steel plate of 2 embodiment of table 1
From above-described embodiment, there is the surrender 260MPa level sour environment military service pipe fitting steel plates of this method production low-carbon to work as The features such as amount, low yield strength ratio, Properties of HIC resistance are excellent, weldability is good.
Above example is only to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair It is bright to be described in detail, it will be understood by those within the art that:Still the present invention can be modified or be waited With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention Among sharp claimed range.

Claims (10)

1. one kind surrender 260MPa level sour environment military service Pipeline Steel Plates, it is characterised in that steel plate chemical composition composition and Its weight/mass percentage composition is:C:0.03-0.06%, Si:0.20-0.40%, Mn:0.80-1.0%, P≤0.010%, S≤0.002%, Nb:0.020-0.040%, Cr:0.10-0.20%, Alt:0.020-0.040%, surplus are Fe and inevitable impurity;Ceq: 0.19-0.27%。
2. a kind of surrender 260MPa level sour environment military service Pipeline Steel Plates according to claim 1, it is characterised in that described The complex tissue for being organized as ferrite, bainite and pearlite of steel plate;Grain size >=8 grade, banded structure≤2 grade.
A kind of 3. surrender 260MPa level sour environment military service Pipeline Steel Plates according to claim 1 or 2, it is characterised in that The steel plate maximum gauge is 40mm.
A kind of 4. surrender 260MPa level sour environment military service Pipeline Steel Plates according to claim 1 or 2, it is characterised in that The steel plate yield strength 370-450MPa, tensile strength 440-500MPa, elongation percentage >=30%, yield tensile ratio 0.87-0.93, -20 DEG C ballistic work >=150J.
5. the production based on a kind of surrender 260MPa levels sour environment military service Pipeline Steel Plate described in claim 1-4 any one Method, it is characterised in that methods described includes smelting, continuous casting, heating, rolling, refrigerating work procedure;The rolling process, using again Crystal region+Unhydrated cement two benches controlled rolling process.
6. a kind of production method of surrender 260MPa level sour environment military service Pipeline Steel Plates according to claim 5, it is special Sign is, the heating process, 1240-1250 DEG C of the maximum heating temperature of steel billet, 1200-1220 DEG C of soaking temperature, always heats Time >=220min, soaking zone time inside furnace >=60min.
7. a kind of production method of surrender 260MPa level sour environment military service Pipeline Steel Plates according to claim 5, it is special Sign is that the rolling process, using recrystallization zone+Unhydrated cement two benches controlled rolling process, first stage rolling temperature is 1000~1100 DEG C, single pass rolling reduction is 10~20%, and it is 30~50% to add up reduction ratio;Second stage rolling temperature is 910 ~930 DEG C, it is 30~50% to add up reduction ratio.
A kind of 8. production of surrender 260MPa levels sour environment military service Pipeline Steel Plate according to claim 5-7 any one Method, it is characterised in that the refrigerating work procedure, ACC water coolings are carried out after rolling, it is 760-780 DEG C to enter coolant-temperature gage, red temperature 620 ~650 DEG C.
A kind of 9. production of surrender 260MPa levels sour environment military service Pipeline Steel Plate according to claim 5-7 any one Method, it is characterised in that the smelting procedure, molten steel are sent into LF refining furnace refining first through electric furnace smelting, feed Al lines during refining 1.2-1.4kg/t steel;Liquid steel temperature reaches 1530-1550 DEG C and is transferred to VD stove Fruit storages, is added before Fruit storage CaSi block 1.0-1.5kg/t steel change inclusion morphology, vacuum≤66.6Pa of Fruit storage, the vacuum retention time >= 20min。
A kind of 10. life of surrender 260MPa levels sour environment military service Pipeline Steel Plate according to claim 5-7 any one Production method, it is characterised in that the continuous casting working procedure, become a useful person using 200mm thickness continuous casting billets, steel billet is carried out according to 1.1min/mm Heating.
CN201710819053.XA 2017-09-12 2017-09-12 Surrender 260MPa levels sour environment military service Pipeline Steel Plate and its production method Pending CN107739990A (en)

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Publication number Priority date Publication date Assignee Title
CN101096735A (en) * 2006-06-26 2008-01-02 舞阳钢铁有限责任公司 Easy-weld hardening high-strength steel plate and production method thereof
CN102337460A (en) * 2011-11-14 2012-02-01 首钢总公司 Ultrahigh-strength structural steel board for ocean engineering and production method thereof
CN103276295A (en) * 2013-06-03 2013-09-04 南京钢铁股份有限公司 Steel plates having hydrogen-induced cracking resistance and production method thereof
CN104357742A (en) * 2014-11-10 2015-02-18 舞阳钢铁有限责任公司 420MPa high-thickness hot-rolled steel sheet for ocean engineering and production method thereof
CN104928595A (en) * 2015-07-07 2015-09-23 南京钢铁股份有限公司 Band steel with good cold forming performance and for automobile structure and production process thereof
CN105779883A (en) * 2016-05-06 2016-07-20 舞阳钢铁有限责任公司 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101096735A (en) * 2006-06-26 2008-01-02 舞阳钢铁有限责任公司 Easy-weld hardening high-strength steel plate and production method thereof
CN102337460A (en) * 2011-11-14 2012-02-01 首钢总公司 Ultrahigh-strength structural steel board for ocean engineering and production method thereof
CN103276295A (en) * 2013-06-03 2013-09-04 南京钢铁股份有限公司 Steel plates having hydrogen-induced cracking resistance and production method thereof
CN104357742A (en) * 2014-11-10 2015-02-18 舞阳钢铁有限责任公司 420MPa high-thickness hot-rolled steel sheet for ocean engineering and production method thereof
CN104928595A (en) * 2015-07-07 2015-09-23 南京钢铁股份有限公司 Band steel with good cold forming performance and for automobile structure and production process thereof
CN105779883A (en) * 2016-05-06 2016-07-20 舞阳钢铁有限责任公司 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method

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