CN106591718A - High-toughness antiacid quenched and tempered pipe steel plate with yield strength being 420 MPa grade and production method - Google Patents
High-toughness antiacid quenched and tempered pipe steel plate with yield strength being 420 MPa grade and production method Download PDFInfo
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C21D2211/002—Bainite
-
- 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
Abstract
The invention discloses a high-toughness antiacid quenched and tempered pipe steel plate with the yield strength being 420 MPa grade and a production method. The steel plate is composed of, by mass, 0.09-0.11% of C, 0.20-0.40% of Si, 1.35-1.43% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, 0.035-0.040% of Nb, 0.040-0.050% of V, 0.30-0.45% of Ni, 0.15-0.25% of Mo, 0.020-0.040% of Alt and the balance Fe and inevitable impurities. The production method comprises the procedures of heating, rolling, quenching and tempering. According to the method, the antiacid quenched and tempered pipe steel plate with the plate thickness being 100 mm and the yield strength being 420 MPa grade produced through the controlled rolling process and the quenching and tempering process has the characteristics of being low in carbon equivalent, cracking susceptibility index and yield ratio, good low-temperature impact strength and weldability and the like.
Description
Technical field
The invention belongs to metallurgical technology field, specifically related to surrenders the antiacid quenching and tempering type pipe fitting steel plate of 420MPa level high-ductilities and life
Product method.
Background technology
China's rapid development of economy is brought to the rapid growth that oil and natural gas are main energy demand, huge
Oil and natural gas equal energy source breach can only be by finding from input overseas or within the border new resource and improving oil exploitation
Technology, it is therefore desirable to substantial amounts of high added value, high-level oil and gas transmission pipe.In recent years, by transfer natural gas from the west to the east a line,
The construction of two wires, China is worldwide realized from pursuing to drawing in heavy caliber, high pressure, high-grade pipe technical elements
Neck.
Pipe fitting steel is commonly used to make natural gas line threeway, elbow etc., for pipe branch and the pipe joint portion of yard
Position, is chronically at the flow stress working environment of high pressure, deep-etching and complexity, and make need to pass through complicated cold coiling, welding and
Multiple heat stamping and shaping, finally also needs overall modifier treatment, thus intensity, toughness to the primary steel of pipe fitting three, resistant to pressure, weldering
Connect, the performance indications such as corrosion-resistant there are strict requirements.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of antiacid tune of the special thickness high-ductility of surrender 420MPa levels of good performance
Matter type pipe fitting steel plate sheet, invention additionally provides a kind of production method of the antiacid pipe fitting steel plate of the special thickness high-ductility of surrender 420MPa levels.
To solve above-mentioned technical problem, the present invention adopts following technical proposals：The antiacid tune of one kind surrender 420MPa level high-ductilities
Matter type pipe fitting steel plate, the steel plate chemical composition and weight/mass percentage composition it is as follows：C：0.09～0.11%, Si：0.20～0.40%,
Mn：1.35～1.43%, P≤0.005%, S≤0.002%, Nb：0.035～0.040%, V：0.040～0.050%, Ni：0.30～
0.45%, Mo：0.15～0.25%, Alt：0.020～0.040%, balance of Fe and inevitable impurity.
Steel plate yield strength >=420MPa of the present invention, tensile strength >=520MPa, yield tensile ratio≤0.85, -46 DEG C of punchings
Hit work(>=120J.
Steel plate maximum gauge of the present invention is 100mm；The steel plate is organized as bainite and ferritic complex group
Knit.
The present invention also provides a kind of production method of the antiacid quenching and tempering type pipe fitting steel plate of above-mentioned surrender 420MPa level high-ductilities, described
Production method includes heating, rolling, quenching, tempering process；The rolling process adopts the rank of recrystallization zone+Unhydrated cement two
Section controlled rolling process；The weight percentage of the steel plate chemical composition is：C：0.09～0.11%, Si：0.20～0.40%, Mn：
1.35～1.43%, P≤0.005%, S≤0.002%, Nb：0.035～0.040%, V：0.040～0.050%, Ni：0.30～
0.45%, Mo：0.15～0.25%, Alt：0.020～0.040%, balance of Fe and inevitable impurity.
Heating process of the present invention：1240～1250 DEG C of the maximum heating temperature of steel billet, soaking temperature 1200～1220
DEG C, total heat time >=330min, soaking zone time inside furnace >=60min.
Rolling process of the present invention：First stage rolling temperature be 1000～1100 DEG C, single pass rolling reduction be 10～
20%, it is 30～50% to add up reduction ratio.
Rolling process of the present invention：Second stage rolling temperature is 850～880 DEG C, and it is 30～50% to add up reduction ratio.
Rolling process of the present invention：ACC water-cooleds are carried out after rolling, it is 760～780 DEG C to enter coolant-temperature gage, red temperature 600～
650℃。
Quenching process of the present invention：890～910 DEG C of quenching temperature, heat time PLC+15min, chill roll speed
1.5m/min, temperature retention time coefficient 2min/mm.
Tempering process of the present invention：600～610 DEG C of tempering heating-up temperature, temperature retention time coefficient 3.5min/mm.
Production method of the present invention also includes smelting procedure：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, steel
Coolant-temperature gage >=1540 ± 10 DEG C, proceed to VD stove Fruit storages, and Fe-Ca line 4～4.5m/ ton steel is added before Fruit storage
Water, changes inclusion morphology, the vacuum≤66.6Pa of Fruit storage, vacuum retention time >=20min.
PLC of the present invention is a parameter of quenching press, for characterizing the time used by the abundant austenitizing of mark steel, tool
Body receives plate size（It is thick, wide, long）, the factor such as the working of a furnace affects.
The mentality of designing of the present invention and method is as follows：Carbon, manganese solution strengthening；A small amount of Nb, V, Mo crystal grain thinning is added, its
Carbonitride plays dispersion-strengthened action；By subsequently accurately cooling controlling and rolling controlling process, make steel plate that there is good mechanical property.
Wherein, each component and content effect in the present invention is：
C：Carbon makes a significant impact on the surrender of steel, tensile strength, welding performance.Carbon can significantly improve steel plate by gap solid solution
Intensity, but carbon content is too high, and the welding performance and toughness of steel can be affected again.
Si：As reducing agent and deoxidier in steelmaking process, while Si can also play solution strengthening effect, but exceed
When 0.5%, the toughness that can cause steel declines, and reduces the welding performance of steel.
Mn：Manganese is with low cost, can increase toughness, intensity and the hardness of steel, improves the quenching degree of steel, improves the hot-working of steel
Performance；Manganese amount is too high, for center segregation easily occurs in big thickness steel plate.
P、S：In general, p and ses are all harmful elements in steel, increase the fragility of steel.Phosphorus becomes welding performance
It is bad, reduce plasticity；Sulphur reduces the ductility and toughness of steel, and in rolling crackle is caused；Therefore reduction p and ses should be tried one's best in steel
In content.
Al：Aluminium is the deoxidier commonly used in steel.A small amount of aluminium is added in steel, can crystal grain thinning, improve impact flexibility.Aluminium is also
With non-oxidizability and corrosion resistance, the too high hot-working character for then affecting steel, welding performance and machinability.
Nb：In order to promote the crystal grain refinement of steel rolling microscopic structure, intensity and toughness can be simultaneously improved, niobium can be in controlled rolling
By suppression austenite recrystallization in journey, effective refinement microstructure, and by precipitation strength matrix.In welding process, niobium
The roughening of austenite crystal when the segregation of atom and precipitation can hinder to heat, and ensure to obtain relatively fine hot shadow after welding
Ring district's groups to knit, improving welding property.
V：Main Function is alternate precipitation and the precipitation strength in ferrite in γ-α transition processes.
Ni:Main Function is to ensure steel plate low-temperature flexibility.
Mo：Main Function improves high tempering stability, significantly improves the elevated temperature strength of steel.
It is using the beneficial effect produced by above-mentioned technical proposal：The special thickness high-ductility of surrender 420MPa levels of this method production
Antiacid quenching and tempering type pipe fitting steel plate yield strength >=420MPa, tensile strength >=520MPa, yield tensile ratio≤0.85, -46 DEG C of ballistic works
≥120J.Steel plate has the features such as low carbon equivalent, low yield strength ratio, low temperature rush good-toughness, weldability is good, and maximum gauge can
Reach 100mm.
Design of Chemical Composition of the present invention adopts low C, it is ensured that the good weldability of steel plate；Designed using Nb, V microalloying,
It is aided with the alloying elements such as Mo, it is ensured that armor plate strength, toughness matching and resistance to elevated temperatures；Bayesian is obtained using quenching+tempering technique
Body, ferritic complex tissue.The inventive method is by controlled rolling and controlled cooling+quenching+tempering technique productions steel plate, gained steel plate tool
There is good cryogenic property, be organized as bainite, ferritic complex tissue, good welding performance, corrosion resistant feature.
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.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention is further detailed explanation.
The antiacid quenching and tempering type pipe fitting steel plate of the special thickness high-ductility of this surrender 420MPa levels is produced using following methods：
（1）Smelting procedure：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and Al lines are fed during refining；Liquid steel temperature >=
1540 ± 10 DEG C, VD stove Fruit storages are proceeded to, Fe-Ca line 4～4.5m/ ton molten steel is added before Fruit storage, changed
Inclusion morphology, the vacuum≤66.6Pa of Fruit storage, vacuum retention time >=20min.Tapping ladle chemistry
Weight percentage be：C：0.09～0.11%, Si：0.20～0.40%, Mn：1.35～1.43%, P≤0.005%, S≤
0.002%, Nb：0.035～0.040%, V：0.040～0.050%, Ni：0.30～0.45%, Mo：0.15～0.25%, Alt：
0.020～0.040%, balance of Fe and inevitable impurity.
（2）Continuous casting working procedure：Become a useful person using 300mm 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 is total to add
Hot time >=330min, soaking zone time inside furnace >=60min.
（4）Rolling process：Rolled using recrystallization zone+Unhydrated cement two benches controlled rolling process, obtained semi-finished product
Steel plate；First stage rolling temperature is 1000～1100 DEG C, and this stage single pass rolling reduction is 10～20%, and accumulative reduction ratio is
30～50%；Second stage rolling temperature is 850～880 DEG C, and it is 30～50% to add up reduction ratio；ACC water-cooleds are carried out after rolling, is entered
760～780 DEG C of coolant-temperature gage, 600～650 DEG C of red temperature.
（5）Quenching process：890～910 DEG C of quenching temperature, heat time PLC+15min, chill roll speed 1.5m/
Min, temperature retention time coefficient 2min/mm.
（6）Tempering process：Semi-finished product steel plate is tempered；600～610 DEG C of tempering heating-up temperature, temperature retention time coefficient
3.5min/mm, you can obtain the pipe fitting steel plate that maximum gauge reaches 100mm.
Embodiment 1
The antiacid quenching and tempering type pipe fitting steel plate weight percentage of surrender 420MPa level high-ductilities is shown in Table 1.
Concrete production technology is as described below：
（1）Smelt：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and liquid steel temperature reaches 1540 DEG C and proceeds to VD stove vacuum
Degassing process, adds Fe-Ca line 4.5m/ ton molten steel before VD, change inclusion morphology；The vacuum of Fruit storage
66.6Pa, vacuum retention time 20min.
（2）Continuous casting：Using the continuous casting billet of 300mm thickness, steel billet is heated according to 1.1min/mm speed.
（3）Heating：1250 DEG C of maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 331min, soaking zone is in stove
Time 63min.
（4）Rolling：First stage rolling temperature is 1030 DEG C, and single pass rolling reduction is 20%, and it is 50% to add up reduction ratio；
Second stage rolling temperature is 860 DEG C, and it is 30% to add up reduction ratio；ACC water-cooleds are carried out after rolling, enters 761 DEG C of coolant-temperature gage, return red temperature
650 DEG C of degree.
(5) quench 890 DEG C, heat time PLC+15min, chill roll speed 1.5m/min, temperature retention time coefficient 2min/mm.
（6）Tempering：600 DEG C of heating-up temperature, temperature retention time coefficient 3.5min/mm.
The mechanical property of the present embodiment gained 58mm thickness pipe fitting steel plates：Yield strength 456MPa, tensile strength 550MPa,
Yield tensile ratio 0.83, the average 168J of -46 DEG C of ballistic works；Macrograph is shown in Fig. 1, and as seen from Figure 1 it is organized as bainite and ferrite
Complex tissue.
Embodiment 2
The antiacid quenching and tempering type pipe fitting steel plate weight percentage of surrender 420MPa level high-ductilities is shown in Table 1.
Concrete production technology is as described below：
（1）Smelt：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and 1550 DEG C of liquid steel temperature proceeds to VD stove vacuum outgas
Process, Fe-Ca line 4m/ ton molten steel is added before VD, change inclusion morphology；Vacuum 66Pa of Fruit storage, vacuum is protected
Hold time 24min.
（2）Continuous casting：Using the continuous casting billet of 300mm thickness, steel billet is heated according to 1.1min/mm.
（3）Heating：1245 DEG C of billet heating temperature highest, 1218 DEG C of soaking temperature, total heat time 335min, soaking zone
Time inside furnace 65min.
（4）Rolling：First stage rolling temperature is 1100 DEG C, and single pass rolling reduction is 10%, and it is 30% to add up reduction ratio；
Second stage rolling temperature is 856 DEG C, and it is 30% to add up reduction ratio, and ACC water-cooleds are carried out after rolling, and enters 760 DEG C of coolant-temperature gage, returns red temperature
600 DEG C of degree.
(5) quench 905 DEG C, heat time PLC+15min, chill roll speed 1.5m/min, temperature retention time coefficient 2min/mm.
（6）Tempering：613 DEG C of heating-up temperature, temperature retention time coefficient 3.5min/mm.
The mechanical property of the present embodiment gained 70mm thickness pipe fitting steel plates：Yield strength 441MPa, tensile strength 545MPa,
Yield tensile ratio 0.81, the average 200J of -46 DEG C of ballistic works；Macrograph is shown in Fig. 2, and as seen from Figure 2 it is organized as bainite and ferrite
Complex tissue.
Embodiment 3
The antiacid quenching and tempering type pipe fitting steel plate weight percentage of surrender 420MPa level high-ductilities is shown in Table 1.
Concrete production technology is as described below：
（1）Smelt：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and 1530 DEG C of liquid steel temperature proceeds to VD stove vacuum outgas
Process, Fe-Ca line 4.3m/ ton molten steel is added before VD, change inclusion morphology；Vacuum 60Pa of Fruit storage, vacuum
Retention time 25min.
（2）Continuous casting：Using the continuous casting billet of 300mm thickness, steel billet is heated according to 1.1min/mm.
（3）Heating：1240 DEG C of maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 337min, soaking zone is in stove
Time 62min.
（4）Rolling：First stage rolling temperature is 1050 DEG C, and single pass rolling reduction is 15%, and it is 38% to add up reduction ratio；
Second stage rolling temperature is 880 DEG C, and it is 40% to add up reduction ratio；ACC water-cooleds are carried out after rolling, enters 770 DEG C of coolant-temperature gage, return red temperature
650 DEG C of degree.
(5) quench 907 DEG C, heat time PLC+15min, chill roll speed 1.5m/min, temperature retention time coefficient 2min/mm.
（6）607 DEG C of heating-up temperature, temperature retention time coefficient 3.5min/mm.
The present embodiment gained 85mm thickness pipe fitting mechanical property of steel plate：The MPa of yield strength 454, the MPa of tensile strength 560,
Yield tensile ratio 0.81, the average 123J of -46 DEG C of ballistic works；Macrograph is shown in Fig. 3, and as seen from Figure 3 it is organized as bainite and ferrite
Complex tissue.
Embodiment 4
The antiacid quenching and tempering type pipe fitting steel plate weight percentage of surrender 420MPa level high-ductilities is shown in Table 1.
Concrete production technology is as described below：
（1）Smelt：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and 1535 DEG C of liquid steel temperature proceeds to VD stove vacuum outgas
Process, Fe-Ca line 4.5m/ ton molten steel is added before VD, change inclusion morphology；Vacuum 62Pa of Fruit storage, vacuum
Retention time 26min.
（2）Continuous casting：Using the continuous casting billet of 300mm thickness, steel billet is heated according to 1.1min/mm.
（3）Heating：1250 DEG C of maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 339min, soaking zone is in stove
Time 68min.
（4）Rolling：First stage rolling temperature is 1000 DEG C, and this stage single pass rolling reduction is 18%, and accumulative reduction ratio is
40%；Second stage rolling temperature is 860 DEG C, and it is 42% to add up reduction ratio, and ACC water-cooleds are carried out after rolling, and enters 767 DEG C of coolant-temperature gage,
650 DEG C of red temperature
（5）903 DEG C of quenching, heat time PLC+15min, chill roll speed 1.5m/min.
（6）Tempering：601 DEG C of heating-up temperature, temperature retention time coefficient 3.5min/mm, temperature retention time coefficient 2min/mm.
The mechanical property of the present embodiment gained 90mm thickness pipe fitting steel plates：Yield strength 458MPa, tensile strength
560MPa, yield tensile ratio 0.82, the average 152J of -46 DEG C of ballistic works；Macrograph is shown in Fig. 4, as seen from Figure 4 its be organized as bainite and
Ferritic complex tissue.
Embodiment 5
The antiacid quenching and tempering type pipe fitting steel plate weight percentage of surrender 420MPa level high-ductilities is shown in Table 1.
Concrete production technology is as described below：
（1）Smelt：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and liquid steel temperature reaches 1545 DEG C and proceeds to VD stove vacuum
Degassing process, adds Fe-Ca line 4.2m/ ton molten steel before VD, change inclusion morphology；Vacuum 65Pa of Fruit storage,
Vacuum retention time 30min.
（2）Continuous casting：Using the continuous casting billet of 300mm thickness, steel billet is heated according to 1.1min/mm.
（3）Heating：1248 DEG C of maximum heating temperature, 1220 DEG C of soaking temperature, total heat time 330min, soaking zone is in stove
Time 65min.
（4）Rolling：First stage rolling temperature is 1080 DEG C, and single pass rolling reduction is 12%, and it is 32% to add up reduction ratio；
Second stage rolling temperature is 860 DEG C, and it is 50% to add up reduction ratio；ACC water-cooleds are carried out after rolling, enters 779 DEG C of coolant-temperature gage, return red temperature
620 DEG C of degree.
（5）902 DEG C of quenching, heat time PLC+15min, chill roll speed 1.5m/min, temperature retention time coefficient 2min/mm.
（6）Tempering：610 DEG C of heating-up temperature, temperature retention time coefficient 3.5min/mm.
The mechanical property of the present embodiment gained 95mm thickness pipe fitting steel plates：Yield strength 458MPa, tensile strength
550MPa, yield tensile ratio 0.83, the average 167J of -46 DEG C of ballistic works；Macrograph is shown in Fig. 4, as seen from Figure 4 its be organized as bainite and
Ferritic complex tissue.
Embodiment 6
The antiacid quenching and tempering type pipe fitting steel plate weight percentage of surrender 420MPa level high-ductilities is shown in Table 1.
Concrete production technology is as described below：
（1）Smelt：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and liquid steel temperature reaches 1540 DEG C and proceeds to VD stove vacuum
Degassing process, adds Fe-Ca line 4.4m/ ton molten steel before VD, change inclusion morphology；Vacuum 64Pa of Fruit storage,
Vacuum retention time 25min.
（2）Continuous casting：Using the continuous casting billet of 300mm thickness, steel billet is heated according to 1.1min/mm.
（3）Heating：1243 DEG C of maximum heating temperature, 1200 DEG C of soaking temperature, total heat time 330min, soaking zone is in stove
Time 60min.
（4）Rolling：First stage rolling temperature is 1040 DEG C, and single pass rolling reduction is 14%, and it is 45% to add up reduction ratio；
Second stage rolling temperature is 850 DEG C, and it is 36% to add up reduction ratio；ACC water-cooleds are carried out after rolling, enters 780 DEG C of coolant-temperature gage, return red temperature
630 DEG C of degree.
（5）910 DEG C of quenching, heat time PLC+15min, chill roll speed 1.5m/min.
（6）Tempering：610 DEG C of heating-up temperature, temperature retention time coefficient 3.5min/mm, temperature retention time coefficient 2min/mm.
The mechanical property of the present embodiment gained 98mm thickness pipe fitting steel plates：Yield strength 441MPa, tensile strength
545MPa, yield tensile ratio 0.81, the average 207J of -46 DEG C of ballistic works；Macrograph is shown in Fig. 4, as seen from Figure 4 its be organized as bainite and
Ferritic complex tissue.
Table 1：The weight percentage of each embodiment light plate chemical composition（wt%）
In table 1, the balance of Fe and inevitable impurity of chemical composition.
From above-described embodiment, this method gained surrender 420MPa level X60 steel plates have good weldability Ceq0.38
～0.40%；Yield strength in 440～460MPa, tensile strength between 530～560MPa, yield tensile ratio 0.80-0.85 it
Between, -46 DEG C of ballistic work >=150J.The antiacid quenching and tempering type pipe fitting steel plate yield tensile ratio of the special thickness high-ductility of surrender 420MPa levels of this method production
It is good that low, low temperature rushes good-toughness, weldability.
Claims (10)
1. it is a kind of to surrender the antiacid quenching and tempering type pipe fitting steel plate of 420MPa level high-ductilities, it is characterised in that the steel plate chemical composition and matter
Amount percentage composition is as follows：C：0.09～0.11%, Si：0.20～0.40%, Mn：1.35～1.43%, P≤0.005%, S≤
0.002%, Nb：0.035～0.040%, V：0.040～0.050%, Ni：0.30-0.45%, Mo：0.15～0.25%, Alt：
0.020～0.040%, balance of Fe and inevitable impurity.
2. the antiacid quenching and tempering type pipe fitting steel plate of surrender 420MPa level high-ductilities according to claim 1, it is characterised in that the steel
Plate yield strength >=420MPa, tensile strength >=520MPa, yield tensile ratio≤0.85, -46 DEG C of ballistic work >=120J.
3. the antiacid quenching and tempering type pipe fitting steel plate of surrender 420MPa level high-ductilities according to claim 1 and 2, it is characterised in that institute
Steel plate maximum gauge is stated for 100mm；The steel plate is organized as bainite and ferritic complex tissue.
4. the life based on the antiacid quenching and tempering type pipe fitting steel plate of a kind of surrender 420MPa level high-ductilities described in claim 1-3 any one
Product method, it is characterised in that the production method includes heating, rolling, quenching, tempering process；The rolling process is using again
Crystal region+Unhydrated cement two benches controlled rolling process；The weight percentage of the steel plate chemical composition is：C：0.09～
0.11%, Si：0.20～0.40%, Mn：1.35～1.43%, P≤0.005%, S≤0.002%, Nb：0.035～0.040%, V：
0.040～0.050%, Ni：0.30～0.45%, Mo：0.15～0.25%, Alt：0.020～0.040%, balance of Fe and can not
The impurity for avoiding.
5. production method according to claim 4, it is characterised in that the heating process：The maximum heating temperature of steel billet
1240～1250 DEG C, 1200～1220 DEG C of soaking temperature, total heat time >=330min, soaking zone time inside furnace >=60min.
6. production method according to claim 4, it is characterised in that the 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 850
～880 DEG C, it is 30～50% to add up reduction ratio.
7. production method according to claim 4, it is characterised in that the rolling process：ACC water-cooleds are carried out after rolling, is entered
Coolant-temperature gage is 760～780 DEG C, 600～650 DEG C of red temperature.
8. production method according to claim 4, it is characterised in that the quenching process：Quenching temperature 890～
910 DEG C, heat time PLC+15min, chill roll speed 1.5m/min, temperature retention time coefficient 2min/mm.
9. the production method according to claim 4-8 any one, it is characterised in that the tempering process：Tempering heating
600～610 DEG C of temperature, temperature retention time coefficient 3.5min/mm.
10. the production method according to claim 4-8 any one, it is characterised in that the production method also includes smelting
Refining operation：Molten steel elder generation Jing electric furnace smeltings, send into LF refining furnace refining, and liquid steel temperature >=1540 ± 10 DEG C proceed to VD stoves vacuum and take off
Gas disposal, adds Fe-Ca line 4～4.5m/ ton molten steel before Fruit storage, change inclusion morphology, Fruit storage
Vacuum≤66.6Pa, vacuum retention time >=20min.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107267862A (en) * | 2017-05-31 | 2017-10-20 | 舞阳钢铁有限责任公司 | 570MPa grades of special thick high-toughness and low-temperature military service pipe fitting steel plates and production method |
| CN107326279A (en) * | 2017-06-22 | 2017-11-07 | 舞阳钢铁有限责任公司 | Thermo-mechanical rolling type special thick easily welding S460M structural steel and irons and production method |
| CN107488812A (en) * | 2017-08-11 | 2017-12-19 | 舞阳钢铁有限责任公司 | Surrender 485MPa grade low-temp environment military service pipe fitting steel plates and its production method |
| CN108265161A (en) * | 2018-02-11 | 2018-07-10 | 舞阳钢铁有限责任公司 | The heat treatment method of Thin Specs quenching and tempering type 12MnNiVR steel plates |
| CN110564921A (en) * | 2019-08-14 | 2019-12-13 | 南京钢铁股份有限公司 | Method for producing ultralow-temperature high-strength acid-resistant container steel by casting blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107267862A (en) * | 2017-05-31 | 2017-10-20 | 舞阳钢铁有限责任公司 | 570MPa grades of special thick high-toughness and low-temperature military service pipe fitting steel plates and production method |
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| CN110564921A (en) * | 2019-08-14 | 2019-12-13 | 南京钢铁股份有限公司 | Method for producing ultralow-temperature high-strength acid-resistant container steel by casting blank |
| CN110564921B (en) * | 2019-08-14 | 2021-08-10 | 南京钢铁股份有限公司 | Method for producing ultralow-temperature high-strength acid-resistant container steel by casting blank |
| CN116970865A (en) * | 2023-07-22 | 2023-10-31 | 湖南华菱湘潭钢铁有限公司 | Production method of aluminum-free pipe fitting steel Q555PF |
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Application publication date: 20170426 |