CN101792884B - Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof - Google Patents
Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof Download PDFInfo
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Abstract
The invention discloses steel with underrelaxation and hydrogen corrosion resistance for a high-speed railway prestressed pull rod and a production method thereof, which belong to the technical field of steel for railways. By adopting Si as a main enhancing element and micro alloying Cr, Ti and B, the material has excellent comprehensive performances during heat treatment. The production flow comprises working procedures of smelting, refining, continuous casting and rolling, wherein the smelting working procedure is carried out on an electric furnace or a converter; and the material is subjected to LF refining and continuously cast into casting blanks. After treated by a heat treatment process, the raw material has the mechanical property of 1,420-1,480Mpa, the elongation percentage of more than or equal to 9.0 percent, the hydrogen stress corrosion fracture resistant time for more than 70 hours, fatigue fracture life for more than 3 millions of times, relaxation less than 3.5 percent for 1,000 hours and low-temperature impact rate not lower than 30KJ and is specially applied to the production of the steel for an unballasted track sleeper prestressed pull rod at a high-speed railway of 350 kilometers/hour.
Description
Technical field
The invention belongs to railway and use the steel technical field; Particularly relate to a kind of underrelaxation, anti-hydrogen matter corrosion high-speed railway prestressed pull rod with steel and working method; Be applicable to that the modified prestressed draw-bar of the high silicon microalloying of carbon is with the working method of steel in the continuous small-billet casting, specialized application is in the production of 350 kilometers/hour high speed railway fragments-free track slab prestressed draw-bars of speed per hour.
Background technology
The concrete slab sleeper that railway originally used is 2.4m * 0.5m, and train speed is during above 200 kilometers, the contact noise of wheel and track and vibration limiting the speed-raising of train.China is building Line for Passenger Transportation in a large number in recent years, because train speed is increasingly high, track structure and road structure is also had higher requirement.At present, China's intercity High-Speed Train Design speed per hour of building is more than 350 kilometers/hour.For guaranteeing that the stable of 350 kilometers/hour trains goes, the standard that the single sleeper of laying has in the past been changed into 2.4m * 6m does not have tiny fragments of stone, coal, etc. concrete slab sleeper.Fragment-free track slab wants elder generation supporting under the high temperature of 42 ℃ of vaporiums 8 hours after producing, and in water cooling pond, baths 3 days again, and the crackle that the plate face surpasses 1mm invariably is just qualified.Horizontal and vertical prestressed draw-bar requires will have better underrelaxation performance than regular sleeper steel wire in the concrete slab sleeper.Simultaneously, require prestressed draw-bar corrosion resistant of anti-environment the in severe environment, anti-hydrogen matter corrosion experiment is more than 70 hours.The railroad sleeper steel wire generally used SWRH77B as compressor wire in the past since SWRH77B wire rod tensile strength higher (1120～1150Mpa), hardness is big, the surface is easy to occur crackle when making the sleeper steel wire, influences the fatigue property of steel wire.This no tiny fragments of stone, coal, etc. concrete slab sleeper is designed by the fritz, requires steel wire in the concrete slab sleeper need carry out 3,000,000 fatigue experiments and " hydrogen embrittlement " experiment, and high carbon steel SWRH77B and SWRH82B wire rod all do not reach index request.
Summary of the invention
The object of the present invention is to provide a kind of underrelaxation, anti-hydrogen matter corrosion high-speed railway prestressed pull rod with steel and working method, carbon, the design of high silicon composition guarantee original wire rod underlying strength in the employing after the modified thermal treatment; Add composition rational Match between alloying element chromium, titanium, the boron three, material has excellent comprehensive mechanical property, reaches the requirement of 350 kilometers/hour high speed railway fragments-free track slab prestressed steel bars of speed per hour.The steel grade tensile strength of design is controlled at 800～900Mpa, and through a time drawing and quenching and temper technology, comprehensive mechanical performance is at 1420～1480Mpa; Unit elongation is greater than 8%; Through hydrogen matter stress corrosion 70 hours; Fatigue lifetime 3,000,000 times, relaxation rate substitute cold drawing material SWRH77B and SWRH82B less than three index requests of 3.5% 3 key.
It is middle carbon quenched and tempered steel that pull bar provided by the invention uses steel, and its chemical ingredients is: carbon 0.34%～0.38%, silicon 1.40%～1.50%; Manganese 0.75%～0.95%, chromium 0.60%～0.80%, phosphorus 0～0.020%; Sulphur 0～0.015%, titanium 0～0.02%, boron 0～0.0060%; Copper 0～0.2%, surplus are iron; Be weight percentage.
Optimal components scope of the present invention is: carbon 0.35%～0.37%, silicon 1.42%～1.48%, manganese 0.82%～0.88%, chromium 0.72%～0.82%; Phosphorus 0～0.012%, sulphur 0～0.015%, titanium 0.01%～0.02%; Boron 0.0045%～0.0055%, copper 0～0.20%, surplus is an iron; Be weight percentage.
The present invention adds alloy Cr in steel, make the Cr content in the steel reach 0.65%～0.75%; When free oxygen is less than 10ppm in steel, adds Ti and play nitrogen fixation, add the boron line and improve the molten boron content of acid, reduce SP 1 and generate, to improve its heat treated hardening capacity and toughness., compare as its strengthening element with C as its main strengthening element with Si, fluidity molten steel is good, reduces continuous small-billet casting " cover eye "; Hardening capacity is good during user's thermal treatment, crystal grain and homogeneous microstructure; It is low to add man-hour intensity, and the tensile strength of wire rod is between 860～920Mpa, and the mould loss is little.After the thermal treatment, comprehensive mechanical performance is stable, satisfies the technical requirements of 350 kilometers/hour no tiny fragments of stone, coal, etc. concrete slab sleeper prestressed draw-bars of high-speed railway fully.
The working method of working method of the present invention comprises that desulfurizing iron is skimmed, converter smelting, pushing off the slag tapping, ladle deoxidation alloying, liquid steel refining, continuous small-billet casting, high-speed rod-rolling mill are rolling, roll the back controlled chilling; It is characterized in that, take following measure in process of production:
Converter adopts desulphurised hot metal to smelt, and the high catch carbon tapping of double slag process improves the molten steel cleanliness factor, and the phosphorus in the assurance steel is less than 0.012%; Converter terminal carbon is controlled at 0.15 weight %～0.30 weight %, and temperature is controlled at 1590～1620 ℃; The pushing off the slag tapping, top of the slag thickness 0～60mm;
Add reductor-silico-calcium barium in the converter tapping process, carry out the molten steel final deoxygenation, adopt ferromanganese and ferrosilicon to carry out alloying, ferrochrome is joined chromium; Utilize aluminum shot or calcium carbide to carry out top of the slag deoxidation in the LF stove refining refining process, after the furnishing branch advances span of control, decide oxygen activity oxygen less than 10ppm after, added the ferrotianium Argon 2～3 minutes, flow is 450～500NL/min; Within 3～5 minutes, add the boron line; Feeding silicon-calcium wire 2m/ ton steel, argon blowing rate 50～120NL/min, argon blowing time impelled large inclusions fully to float at 15～20 minutes;
Continuous casting adopts the full guard cast, and tundish adopts alkaline covering agent; Continuous cast mold adopts HMP (1180～1250 ℃ of hemisphere fusing points), HV (0.80～0.89Pas; 1300 ℃), eutectic speed 59～70 seconds, 1350 ℃ (the accurate sample of melting speed index dissolves under specified temperature fully or the needed time of liquefying is represented.This covering slag solution time is 59～70 seconds, under 1350 ℃ of situation), the big (0.32～0.40kg/m of strand per surface area covering slag consumption
2), make the interior thermal conduction resistance of mold become big, cold heat conduction homogeneity improves a little less than the mold, guarantees cc billet surface quality.
Billet heating temperature is 1050～1100 ℃, and start rolling temperature is 1000～1100 ℃, and laying temperature is 820～860 ℃; Air-cooled section blower fan aperture is 100%; All the other blower fan Close Alls do not add stay-warm case, the transformation temperature zone; Keep its 0.5～2.0 ℃/second speed of cooling more slowly, guarantee the poker characteristic of wire rod;
After wire rod process a time drawing aftertreatment, adopt 960 ℃～980 ℃ of quenching temperatures, after 520～550 ℃ of modifier treatment of tempering temperature, the tensile strength of material is between 1420～1480Mpa; Reduction of area >=50%; Rate elongation (specimen length is 105mm) >=9.0%.Material passes through the hydrogen matter stress corrosion fracture time more than 70 hours; Repeated stress failure life-span 3,000,000 times, relaxation rate are less than 3.5% (load 1000 hours);-40 ℃ of low-temperature impact works are not less than 30KJ.
The present invention can use wire rod by stably manufactured high speed railway fragments-free sleeper prestressed draw-bar, substitutes the SWRH77B and the SWRH82B that use at present.The present invention adopts carbon quenched and tempered steel in the continuous small-billet casting production, is specifically designed to the production of 350 kilometers/hour no tiny fragments of stone, coal, etc. concrete slab sleeper prestressed draw-bars of high-speed railway with steel.
Embodiment
The present invention can implement in Steel Complex, produces the instance of high-speed railway sleeper steel wire, and its operational path is:
Desulfurizing iron skims → and converter smelting → pushing off the slag tapping → ladle deoxidation alloying → ladle refining furnace → aluminum shot or carbide slag emaciated face oxygen → 160mm * 160mm square billet casting machine cast → mold induction stirring mated ends induction stirring → high-speed rod-rolling mill be rolling → roll back slow cooling → finished product packing.
Converter smelting main technologic parameters such as following table
| Heat | Go into stove molten iron S, % | The converter terminal temperature, ℃ | Converter terminal C, % | Si-Fe，k g | Mn-Fe，k g | Cr-Fe， kg | Si-Ca-Ba ，kg |
| 9B03010 | 0.045 | 1613 | 0.27 | 1550 | 60 | 500 | 250 |
| 9A03157 | 0.040 | 1620 | 0.17 | 1550 | 60 | 500 | 250 |
| 9A03158 | 0.028 | 1617 | 0.15 | 1550 | 60 | 480 | 250 |
| 9A03159 | 0.046 | 1599 | 0.15 | 1550 | 60 | 500 | 250 |
| 9B03015 | 0.038 | 1603 | 0.21 | 1550 | 60 | 500 | 250 |
Refining main technologic parameters such as following table
| Heat | Argon gas Nl/min (in earlier stage) | Argon gas Nl/min (heating) | Argon gas Nl/min (soft blow) | Submerged arc slag, Kg | Synthetic slag, Kg | Activity oxygen, ppm |
| 9B03010 | 510 | 300 | 100 | 300 | 600 | 8 |
| 9A03157 | 490 | 330 | 90 | 250 | 600 | 9 |
| 9A03158 | 510 | 320 | 110 | 300 | 800 | 7 |
| 9A03159 | 520 | 340 | 120 | 280 | 700 | 5 |
| 9B03015 | 500 | 320 | 120 | 300 | 800 | 6 |
Continuous casting and rolling main technologic parameters such as following table
| Heat | In bag temperature ℃ | Water yield L/min | Pulling rate m/min | Start rolling temperature, ℃ | Go out final rolling temperature, ℃ | Laying temperature, ℃ |
| 9B03010 | 1515 | 1657 | 1.65 | 1020 | 930 | 830 |
| 9A03157 | 1507 | 1659 | 1.68 | 1060 | 950 | 860 |
| 9A03158 | 1510 | 1709 | 1.70 | 1050 | 940 | 830 |
| 9A03159 | 1514 | 1654 | 1.70 | 1060 | 960 | 850 |
| 9B03015 | 1504 | 1658 | 1.70 | 1050 | 930 | 850 |
Finished product composition and wire rod performance such as following table
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Tensile strength, Mpa | Reduction of area, % |
| 9B03010 | 0.34 | 1.45 | 0.85 | 0.009 | 0.006 | 0.60 | 850 | 34.5 |
| 9A03157 | 0.36 | 1.44 | 0.86 | 0.005 | 0.004 | 0.650 | 865 | 43 |
| 9A03158 | 0.36 | 1.46 | 0.84 | 0.010 | 0.005 | 0.76 | 875 | 34.5 |
| 9A03159 | 0.37 | 1.47 | 0.85 | 0.008 | 0.008 | 0.77 | 840 | 47 |
| 9B03015 | 0.38 | 1.45 | 0.88 | 0.011 | 0.006 | 0.80 | 830 | 44.5 |
350 kilometers/hour ballastless track of high-speed railway pillow prestressed draw-bars that adopt above-mentioned process method to produce are used wire rod, and steady quality is issued the user and used reflection good.
Embodiment 1: heat (batch) number 9B03010
Converter smelting, 75 tons of raw material molten iron add-ons, 11.5 tons of conversion pigs, 4.5 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm2, oxygen supply time 17 minutes and 35 seconds; Agglomerated pellet 806kg.Lime adding amount 4824kg, light dolomite 1664kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.27%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, silicomanganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 510Nl/min, mid-term flow 300Nl/min, later stage argon flow amount 50Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
The 5# casting machine, 1515 ℃ of middle bag temperature, mold water yield 1657L/min, pulling rate 1.75/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Ti，％ | B，％ |
| 9B03010 | 0.33 | 1.42 | 0.80 | 0.008 | 0.005 | 0.60 | 0.010 | 0.0040 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 850Mpa, reduction of area 34.5%.
Wire rod drawing process: Ф 14.3mm → 12.94mm;
Thermal treatment process control:
Rod iron detects over-all properties
| Diameter | The tension rank, Mpa | Unit elongation, % L0=105mm | Relative reduction in area, % | Anti-hydrogen-type corrosion, h | Fatigue lifetime, ten thousand times | Relaxation rate, % 1000 hours | Ballistic work, KJ/-40 ℃ |
| 12.95 | ?1437 | 9.5 | 55.3 | 86 | 350 | 2.9 | 36 |
Embodiment 2: heat (batch) number 9A03157
Converter smelting, 74 tons of raw material molten iron add-ons, 10.9 tons of conversion pigs, 4.7 tons of steel scraps, oxygen supply work oxygen is pressed 7.5kg/cm2, oxygen supply time 16 minutes and 33 seconds; Agglomerated pellet 1306kg.Lime adding amount 4424kg, light dolomite 1854kg; Ore deposit 1488kg difficult to understand; End point carbon: 0.22%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, silicomanganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 490Nl/min, mid-term flow 330Nl/min, later stage argon flow amount 50Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 17ppm.
The 5# casting machine, 1508 ℃ of middle bag temperature, mold water yield 1659L/min, pulling rate 1.75/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Ti，％ | B，％ |
| 9A03157 | 0.35 | 1.45 | 0.85 | 0.009 | 0.005 | 0.70 | 0.012 | 0.0045 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 850Mpa, reduction of area 34.5%.
Wire rod drawing process: Ф 14.6mm → 13.09mm;
Thermal treatment process control:
| Quenching temperature, ℃ | Tempering temperature, ℃ |
| The higher authorities | Following | The higher authorities | Following |
| 965 | 963 | 530 | 529 |
Rod iron detects over-all properties
| Diameter | The tension rank, Mpa | Unit elongation, % L0=105mm | Relative reduction in area, % | Anti-hydrogen-type corrosion, h | Fatigue lifetime, ten thousand times | Relaxation rate, % 1000 hours | Ballistic work, KJ/-40 ℃ |
| 13.09 | 1451 | 9.8 | 52.5 | 90 | 435 | 2.1 | 34 |
Embodiment 3: heat (batch) number 9A03158
Converter smelting, 73.5 tons of raw material molten iron add-ons, 11.2 tons of conversion pigs, 4.8 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm2, oxygen supply time 14 minutes and 23 seconds; Agglomerated pellet 666kg.Lime adding amount 4824kg, light dolomite 1664kg; Ore deposit 1162kg difficult to understand; End point carbon: 0.30%, phosphorus: 0.01%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, silicomanganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 460Nl/min, mid-term flow 330Nl/min, later stage argon flow amount 50Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
The 5# casting machine, 1519 ℃ of middle bag temperature, mold water yield 1657L/min, pulling rate 1.75/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Ti，％ | B，％ |
| 9A03158 | 0.38 | 1.50 | 0.95 | 0.008 | 0.005 | 0.80 | 0.018 | 0.0050 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 830Mpa, reduction of area 54.5%.
Wire rod drawing process: Ф 14.6mm → 13.09mm;
Thermal treatment process control:
Rod iron detects over-all properties
| Diameter | The tension rank, Mpa | Unit elongation, % L0=105mm | Relative reduction in area, % | Anti-hydrogen-type corrosion, h | Fatigue lifetime, ten thousand times | Relaxation rate, % 1000 hours | Ballistic work, KJ/-40 ℃ |
| 13.09 | 1451 | 9.8 | 52.5 | 90 | 435 | 2.1 | 34 |
Embodiment 4: heat (batch) number 9A03159
Converter smelting, 74 tons of raw material molten iron add-ons, 12.5 tons of conversion pigs, 4.3 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm2, oxygen supply time 17 minutes and 32 seconds; Agglomerated pellet 886kg.Lime adding amount 4334kg, light dolomite 1154kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.16%, phosphorus: 0.017%; 1600 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 490Nl/min, mid-term flow 350Nl/min, later stage argon flow amount 50Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
The 5# casting machine, 1513 ℃ of middle bag temperature, mold water yield 1657L/min, pulling rate 2.02/min.
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 870MPa, reduction of area 44.5%.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Ti，％ | B，％ |
| 9A03159 | 0.36 | 1.48 | 0.88 | 0.008 | 0.005 | 0.75 | 0.015 | 0.0046 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 830Mpa, reduction of area 54.5%.
Wire rod drawing process: Ф 14.6mm → 13.29mm;
Thermal treatment process control:
Rod iron detects over-all properties
| Diameter | The tension rank, Mpa | Unit elongation, % L0=105mm | Relative reduction in area, % | Anti-hydrogen-type corrosion, h | Fatigue lifetime, ten thousand times | Relaxation rate, % 1000 hours | Ballistic work, KJ/-40 ℃ |
| 13.29 | 1465 | 10.2 | 56.5 | 92 | 456 | 1.8 | 35 |
Embodiment 5: heat (batch) number 9803015
Converter smelting, 75 tons of raw material molten iron add-ons, 11.5 tons of conversion pigs, 4.5 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 17 minutes and 35 seconds; Agglomerated pellet 806kg.Lime adding amount 4824kg, light dolomite 1664kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.27%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 500Nl/min, mid-term flow 300Nl/min, later stage argon flow amount 50Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
The 5# casting machine, 1515 ℃ of middle bag temperature, mold water yield 1657L/min, pulling rate 1.65/min.
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 890MPa, reduction of area 49.5%.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Ti，％ | B，％ |
| 9B03015 | 0.37 | 1.47 | 0.86 | 0.006 | 0.005 | 0.84 | 0.017 | 0.0046 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 830Mpa, reduction of area 54.5%.
Wire rod drawing process: Ф 14.6mm → 13.29mm;
Thermal treatment process control:
Rod iron detects over-all properties
| Diameter | The tension rank, Mpa | Unit elongation, % L0=105mm | Relative reduction in area, % | Anti-hydrogen-type corrosion, h | Fatigue lifetime, ten thousand times | Relaxation rate, % 1000 hours | Ballistic work, KJ/-40 ℃ |
| 13.29 | ?1470 | 9.7 | 59.5 | 89 | 456 | 2.3 | 32 |
Claims (1)
1. a underrelaxation, anti-hydrogen matter corrosion high-speed railway prestressed pull rod use the steel working method, comprise that desulfurizing iron is skimmed, converter smelting, pushing off the slag tapping, ladle deoxidation alloying, liquid steel refining, continuous small-billet casting, high-speed rod-rolling mill are rolling, roll controlled chilling afterwards; It is characterized in that, take following measure in process of production:
Converter adopts desulphurised hot metal to smelt, and the high catch carbon tapping of double slag process improves the molten steel cleanliness factor, and the phosphorus in the assurance steel is less than 0.012%; Converter terminal carbon is controlled at 0.15 weight %～0.30 weight %, and temperature is controlled at 1590～1620 ℃; The pushing off the slag tapping, top of the slag thickness 0～60mm;
Add reductor-silico-calcium barium in the converter tapping process, carry out the molten steel final deoxygenation, adopt ferromanganese and ferrosilicon to carry out alloying, ferrochrome is joined chromium; Utilize aluminum shot or calcium carbide to carry out top of the slag deoxidation in the LF stove refining refining process, after the furnishing branch advances span of control, decide oxygen activity oxygen less than 10ppm after, added the ferrotianium Argon 2～3 minutes, flow is 450～500NL/min; Within 3～5 minutes, add the boron line; Feeding silicon-calcium wire 2m/ ton steel, argon blowing rate 50～120NL/min, argon blowing time impelled large inclusions fully to float at 15～20 minutes;
Continuous casting adopts the full guard cast, and tundish adopts alkaline covering agent; Continuous cast mold adopts fusing point: 1180～1250 ℃ of hemisphere fusing points, viscosity: 0.80～0.89Pas, and 1300 ℃, molten speed: 59～70 seconds, the covering slag of performance under 1350 ℃ of conditions, strand per surface area covering slag consumption is at 0.32～0.40kg/m
2Between, make the interior thermal conduction resistance of mold become big, cold heat conduction homogeneity improves a little less than the mold, guarantees cc billet surface quality;
Billet heating temperature is 1050～1100 ℃, and start rolling temperature is 1000～1100 ℃, and laying temperature is 820～860 ℃; Air-cooled section blower fan aperture is 100%; All the other blower fan Close Alls do not add stay-warm case, the transformation temperature zone; Keep its 0.5～2.0 ℃/second speed of cooling more slowly, guarantee the poker characteristic of wire rod;
After wire rod process a time drawing aftertreatment, adopt 960 ℃～980 ℃ of quenching temperatures, after 520～550 ℃ of modifier treatment of tempering temperature, the tensile strength of material is between 1420～1480Mpa; Reduction of area >=50%; Rate elongation >=9.0%, specimen length are 105mm; Material through the anti-hydrogen matter stress corrosion fracture time more than 70 hours; Repeated stress failure life-span 3,000,000 times, relaxation rate be less than 3.5%, load 1000 hours;-40 ℃ of low-temperature impact works are not less than 30KJ;
Underrelaxation, anti-hydrogen matter corrosion high-speed railway prestressed pull rod use the chemical ingredients of steel to be: carbon 0.35%～0.37%, silicon 1.42%～1.48%, manganese 0.82%～0.88%; Chromium 0.72%～0.82%; Phosphorus 0～0.012%, sulphur 0～0.015%, titanium 0.01%～0.02%; Boron 0.0045%～0.0055%, surplus are iron; Be weight percentage.
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| CN104313493A (en) * | 2014-11-08 | 2015-01-28 | 江苏天舜金属材料集团有限公司 | Steel for hydrogen corrosion-resistant high-speed railway prestressed pull rod and heat treatment method |
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2009
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