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Manufacturing method of high-yield non-bonding prestress steel bar

A prestressed steel bar and a manufacturing method are applied in the manufacturing field of metal products, which can solve the problems of no insulating protective layer, unsatisfactory insulating effect, complicated construction procedures, etc., so as to avoid excessive corrosion rate, avoid intergranular corrosion and The effect of pitting exceeding the standard and ensuring the ferrite content

Active Publication Date: 2014-03-19
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the prestressed steel rods used in the Bock slab track in Germany do not have any insulating protective layer on the outside. The insulation between the prestressed steel rods in the track slab is realized by insulating fasteners, and the insulation effect is not ideal.
Japan adopts the practice of coating modified asphalt on prestressed steel rods. Although coating modified asphalt can improve the insulation and anticorrosion performance of prestressed steel rods, it will cause environmental pollution during the construction process.
[0004] At the same time, the large-scale buildings at the present stage all use prestressed rolling concrete and steel strands for concrete pouring. During construction, anchorages must be used to buckle the two ends and fix them before pouring. Although it can also be better solved Fix the problem, but the anchor cost is high, the construction process is cumbersome and other problems
Moreover, steel rods for construction are used as steel for concrete structures. Most of the ordinary steel rods are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel rods are widely used in house construction in my country, especially floor panels Due to the low yield strength of the steel bar, the artificial active load in the construction process often causes the upper steel bar of the double-layer two-way steel bar to be bent and deformed, which cannot meet the structural limitations of the steel bar concrete protection thickness. Cracks, causing hidden dangers in engineering quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for manufacturing high-yield unbonded prestressed steel rods, comprising the following steps:

[0032] Step 1: Use high manganese steel as the base material, add the base material and alloy into the furnace for preliminary smelting to obtain billets, the temperature of the preliminary smelting is 1250-1300°C, keep warm for 0.5-0.75h after smelting, the amount of alloy added is 2-4% of the weight of the material, the alloy includes the following components by mass percentage: carbon: 0.55%, silicon: 1%, manganese: 0.8%, chromium: 1.15%, molybdenum: 0.13%, tungsten: 0.07, phosphorus: 0.025 %, sulfur: 0.0075%, vanadium: 0.035%, aluminum: 0.017%, niobium: 0.25%, 0-0.07% residual elements, the rest is Fe, and vanadium is added by adding ferrovanadium nitride;

[0033] Step 2: Water-cool the blank obtained in step 1 to room temperature at a cooling rate of 18-20°C / s, and then temper. The tempering temperature is 1450-1500°C, and the tempering...

Embodiment 2

[0042] This embodiment provides a method for manufacturing high-yield unbonded prestressed steel rods, comprising the following steps:

[0043] Step 1: Use high manganese steel as the base material, add the base material and alloy into the furnace for preliminary smelting to obtain billets, the temperature of the preliminary smelting is 1250-1300°C, keep warm for 0.5-0.75h after smelting, the amount of alloy added is 2-4% of the weight of the material, the alloy includes the following components by mass percentage: carbon: 0.6%, silicon: 0.9%, manganese: 0.77%, chromium: 1.16%, molybdenum: 0.24%, tungsten: 0.05, phosphorus: 0.025 %, sulfur: 0.0075%, vanadium: 0.025%, aluminum: 0.03%, niobium: 0.19%, 0-0.07% residual elements, the rest is Fe, and vanadium is added by adding ferrovanadium nitride;

[0044] Step 2: Water-cool the blank obtained in step 1 to room temperature at a cooling rate of 18-20°C / s, and then temper. The tempering temperature is 1450-1500°C, and the temperin...

Embodiment 3

[0053] This embodiment provides a method for manufacturing high-yield unbonded prestressed steel rods, comprising the following steps:

[0054] Step 1: Use high manganese steel as the base material, add the base material and alloy into the furnace for preliminary smelting to obtain billets, the temperature of the preliminary smelting is 1250-1300°C, keep warm for 0.5-0.75h after smelting, the amount of alloy added is 2-4% of the weight of the material, the alloy includes the following components by mass percentage: carbon: 0.65%, silicon: 1.1%, manganese: 0.75%, chromium: 1.07%, molybdenum: 0.19%, tungsten: 0.03, phosphorus: 0.025 %, sulfur: 0.0075%, vanadium: 0.02%, aluminum: 0.01%, niobium: 0.17%, 0-0.07% residual elements, the rest is Fe, and vanadium is added by adding ferrovanadium nitride;

[0055] Step 2: Water-cool the blank obtained in step 1 to room temperature at a cooling rate of 18-20°C / s, and then temper. The tempering temperature is 1450-1500°C, and the temperin...

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PUM

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Abstract

The invention discloses a manufacturing method of a high-yield non-bonding prestress steel bar. The steel bar has the advantages of bringing convenience to manual construction, being low in cost, high in strength, good in ductility and high in delayed fracture and saving steel, has ideal insulation effects, and can reduce environment pollution. According to the manufacturing method, steel structure anticorrosive paint is adopted, good mechanical performance and excellent anti-corrosion performance are achieved, stability for weather, oil water mixtures and the like is good, various colors can be mixed according to needs, the steel bar can have good visual effects after the steel anticorrosive paint is used, attractiveness and elegance in decoration are achieved, and cost can also be saved due to the fact that the paint has long anti-corrosion time.

Description

technical field [0001] The invention relates to a method for manufacturing metal products, in particular to a method for manufacturing high-yield unbonded prestressed steel rods. Background technique [0002] At present, ballastless track is used to replace ballasted track in domestic and foreign high-speed railway tracks, among which Bock slab track in Germany and Shinkansen slab track in Japan are the most widely used. [0003] However, the prestressed steel rods used in the German Bock slab track are not provided with any insulating protective layer outside, and the insulation between the prestressed steel rods in the track slab is realized by insulating fasteners, and the insulation effect is not ideal. Japan adopts the practice of coating modified asphalt on prestressed steel rods. Although coating modified asphalt can improve the insulation and anticorrosion performance of prestressed steel rods, it will cause environmental pollution during the construction process. ...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB21C37/042C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26
Inventor 吴海洋姚圣法
Owner TIANSHUN GROUP
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