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Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof

A technology of prestressed tie rods and high-speed railways, applied in the production of prestressed tie rods for ballastless track slabs of high-speed railways with a speed of 350 km/h, and in the field of billet continuous casting medium-carbon and high-silicon micro-alloyed quenched and tempered prestressed tie rods , can solve the problems of high-carbon steel wire rod not meeting the index requirements, affecting the fatigue performance of the steel wire, and prone to cracks on the surface, and achieve the effects of stable comprehensive mechanical properties, good hardenability, and good fluidity of molten steel

Active Publication Date: 2010-08-04
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, SWRH77B was generally used as prestressed steel wire for railway sleepers. Due to the high tensile strength (1120-1150Mpa) and high hardness of SWRH77B wire rod, cracks are easy to appear on the surface when making sleeper steel wires, which affects the fatigue performance of steel wires.
This kind of ballastless sleeper board was designed by the Germans, requiring the steel wire in the sleeper board to undergo 3 million fatigue tests and "hydrogen embrittlement" experiments, and the high carbon steel SWRH77B and SWRH82B wire rods failed to meet the index requirements

Method used

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  • Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof
  • Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof
  • Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: furnace number 9B03010

[0027] For converter smelting, the amount of raw material molten iron added is 75 tons, steelmaking pig iron is 11.5 tons, steel scrap is 4.5 tons, the working oxygen pressure of oxygen supply is 7kg / cm2, the oxygen supply time is 17 minutes and 35 seconds; the consolidated pellets are 806kg. The amount of lime added is 4824kg, lightly burned dolomite is 1664kg; Austrian ore is 1761kg; end point carbon: 0.27%, phosphorus: 0.013%; tapping temperature is 1613°C.

[0028] Deoxidation alloying, silicon calcium barium 250kg, silicon manganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.

[0029] For LF refining furnace, the flow rate of argon gas in the early stage is 510Nl / min, the flow rate in the middle stage is 300Nl / min, and the flow rate of argon gas in the later stage is 50Nl / min.

[0030] 5# caster, tundish temperature 1515°C, crystallizer water volume 1657L / min, casting speed 1.75 / min.

[0031] Tundish smelting compo...

Embodiment 2

[0039] Embodiment 2: furnace number 9A03157

[0040] Converter smelting, raw material molten iron added 74 tons, steelmaking pig iron 10.9 tons, scrap steel 4.7 tons, oxygen supply working oxygen pressure 7.5kg / cm2, oxygen supply time 16 minutes 33 seconds; consolidated pellets 1306kg. The amount of lime added is 4424kg, lightly burned dolomite is 1854kg; Austrian ore is 1488kg; endpoint carbon: 0.22%, phosphorus: 0.013%; tapping temperature is 1613°C.

[0041] Deoxidation alloying, silicon calcium barium 250kg, silicon manganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.

[0042]For LF refining furnace, the flow rate of argon gas in the early stage is 490Nl / min, the flow rate in the middle stage is 330Nl / min, the flow rate of argon gas in the later stage is 50Nl / min, the synthetic slag is added 600kg, the submerged arc slag is 300kg, and the outbound oxygen activity is 17ppm.

[0043] 5# caster, tundish temperature 1508°C, crystallizer water volume 1659L / min, cast...

Embodiment 3

[0053] Embodiment 3: furnace number 9A03158

[0054] For converter smelting, the amount of raw material molten iron added is 73.5 tons, steelmaking pig iron is 11.2 tons, steel scrap is 4.8 tons, the working oxygen pressure of oxygen supply is 7kg / cm2, the oxygen supply time is 14 minutes and 23 seconds; the consolidated pellets are 666kg. The amount of lime added is 4824kg, lightly burned dolomite is 1664kg; Austrian ore is 1162kg; endpoint carbon: 0.30%, phosphorus: 0.01%; tapping temperature is 1613°C.

[0055] Deoxidation alloying, silicon calcium barium 250kg, silicon manganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.

[0056] For LF refining furnace, the flow rate of argon gas in the early stage is 460Nl / min, the flow rate in the middle stage is 330Nl / min, and the flow rate of argon gas in the later stage is 50Nl / min.

[0057] 5# caster, tundish temperature 1519℃, crystallizer water volume 1657L / min, casting speed 1.75 / min.

[0058] Tundish smelting compos...

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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 [0001] The invention belongs to the technical field of railway steel, in particular to a low-relaxation, hydrogen-resistant corrosion-resistant steel for high-speed railway prestressed tie rods and a production method, which is suitable for carbon-high-silicon micro-alloying quenching and tempering prestressing in billet continuous casting The production method of steel for tie rods is specially applied to the production of prestressed tie rods for ballastless track slabs of high-speed railways with a speed of 350 km / h. Background technique [0002] The sleeper board originally used by the railway is 2.4m×0.5m. When the train speed exceeds 200 kilometers, the contact noise and vibration between the wheels and the track limit the speed of the train. In recent years, a large number of passenger dedicated lines are being built in my country. As the train speed is getting higher and higher, higher requirements are put forward for the track structure and roadbed s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/28C22C38/18C21C5/28C21C7/06B22D11/111C21D9/52C21D1/18B21B1/16
Inventor 周德李永东王全礼王立峰孔祥涛孙佳兰代旺喻黄海王莉张宝全黄细阳叶少锋孙齐松丁宁李三凯赵福林郑权
Owner SHOUGANG CORPORATION
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