Production method of HRB400 steel bar for high speed railway

A high-speed railway and production method technology, applied in the field of metallurgy, can solve problems such as difficult to meet concrete simply supported beams, quality defects, etc., and achieve the effects of excellent welding performance, uniform structure, and high strength

Active Publication Date: 2018-12-28
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, there are the following problems in the prior art: the existing HRB400E hot-rolled ribbed steel bar has defects in quality, and it is diffi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1: The method for producing HRB400 steel bars for high-speed railways of the present invention includes the following steps:

[0015] 1) Composition design and control of steel bar stock (each component in the present invention is a mass fraction): steel bar adopts vanadium-nitrogen microalloying process, carbon: 0.21% to 0.24%, silicon: 0.30% to 0.60%, manganese: 1.30% ~1.50%, vanadium is controlled by combined addition of vanadium iron, vanadium iron nitride or vanadium-nitrogen alloy, vanadium: 0.030%~0.040%, nitrogen: 0.0070%~0.0100%; carbon is controlled with narrow composition, reducing manganese and increasing silicon, Make full use of the maximum solid solution strengthening of silicon in the range of 0.30% to 0.60%, and add ferro-vanadium and ferro-vanadium nitride (or vanadium-nitrogen alloy) according to the ratio of vanadium to nitrogen 4:1 to ensure that vanadium carbonitride is in the steel The analysis found to increase the strength of the steel bar,...

Example Embodiment

[0023] Example 2

[0024] 1) Control of the smelting composition of the blank (each composition in the present invention is a mass fraction): carbon: 0.22%, silicon: 0.49%, manganese: 1.34%, vanadium: 0.035%, nitrogen: 0.0086%, carbon equivalent: 0.46%;

[0025] 2) The billet is heated in the furnace for 70 minutes, and three-stage heating is adopted. The temperature of the soaking section is controlled at 1160°C, and the rolling temperature is controlled at 1040°C. Compensation heating is performed on the tail of the steel bar (the tail temperature is 30°C higher than other parts, for example 30℃ higher than the head);

[0026] 3) The cooling water volume of each stand of the intermediate rolling and finishing mills is 86L / Min, the water pressure is 0.23MPa, and the gap between the cooling bed entrance skirts is 6mm;

[0027] 4) The steel bar is cooled naturally after rolling, without controlled cooling or water cooling, and the upper cooling bed temperature is 1025℃.

[0028] 5) Cont...

Example Embodiment

[0029] Example 3

[0030] 1) Billet smelting composition control (each composition in the present invention is a mass fraction): carbon: 0.23%, silicon: 0.43%, manganese: 1.36%, vanadium: 0.035%, nitrogen: 0.0084%, carbon equivalent: 0.47%;

[0031] 2) The billet is heated in the furnace for 70 minutes, using three-stage heating, the soaking zone temperature is controlled at 1152°C, and the start-rolling temperature is controlled at 1035°C, and the tail part of the steel bar is compensated heating (the tail temperature is 25°C higher than other parts);

[0032] 3) The cooling water volume of each stand of the intermediate rolling and finishing rolling mill is 90L / Min, the water pressure is 0.22MPa, and the gap between the cooling bed entrance skirts is 6mm;

[0033] 4) The steel bars are cooled naturally after rolling, without controlled cooling or water cooling, and the upper cooling bed temperature is 1020℃.

[0034] 5) Control steelmaking and rolling in accordance with the above proc...

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Abstract

The invention provides a method for producing HRB400 steel bar for high-speed railway, comprising the following four steps. Step A, preparation of components: 0.21%-0.24% carbon, 0.30%-0.60% silicon,1. 30%-1.50% manganese, 0.030%-0.040% vanadium, 0.0070%-0.0100% nitrogen, the carbon equivalent of the steel bar being controlled to be below 0.48%. Step B, steel rolling billet is heated in the furnace for 60 to 90 minutes, the soaking zone temperature being controlled at 1150+/-40 DEG C, the initial rolling temperature being controlled at 1030+/-30 DEG C, and the tail temperature being 20 to 50DEG C. Step C, medium rolling and finishing mill. The cooling water volume of each rack is<=100L/Min, the water pressure being <=0.25MPa, and the gap of the cold bed inlet is adjusted to be more than5mm. Step D, natural cooling after rolling, no cooling control or water cooling, upper cooling bed temperature is 1000 to 1050 DEG C. The invention makes the steel bar have better structural uniformity, good welding performance and lower strain aging sensitivity.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for producing HRB400 steel bars for high-speed railways. Background technique [0002] China's railway industry has developed rapidly. For China's high-speed railway, its development achievements have been particularly remarkable in the past ten years. The operating mileage exceeds more than half of the world's total, and the four-vertical railway line has basically taken shape. At present, China's high-speed railway operation network is the largest in scale and the fastest in operation in the world. The concept of replacing roads with bridges is one of the main strategies for China's high-speed railway construction. The bridge mileage of China's high-speed railway accounts for 82% of the line mileage, and the concrete simply supported box girder bridges with common spans (32 meters and 24 meters) account for the total bridge mileage. The proportion of mileage is basically abo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/08
CPCC21D8/08C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/12
Inventor 何维邓深甘贵平樊雷钱学海陈利苏捷杰
Owner LIUZHOU IRON & STEEL
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