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A large-scale high-strength prestressed steel, its preparation process and its application

A prestressed steel and preparation technology, applied in the field of steel production and manufacturing, can solve the problems of unevenness, low sorbite rate, low tensile strength of bridge cables, etc., and achieve the effect of strengthening toughness

Active Publication Date: 2022-05-24
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem of hot-rolled wire rods for prestressed steel wire strands in my country is that the sorbite rate is not high and uneven, resulting in low tensile strength of bridge cables, which is also the main factor restricting the development of our prestressed steel wire strands. factor

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  • A large-scale high-strength prestressed steel, its preparation process and its application

Examples

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preparation example Construction

[0039] Preparation process of large-scale high-strength prestressed steel coils, including the following preparation steps:

[0040](1) Converter smelting: the total loading capacity is 120 tons, of which the addition of molten iron is 102 tons, the amount of scrap steel is 18 tons for oxygen blowing smelting, of which the P content of the molten iron into the furnace is ≤ 0.120wt%, the Ni content is 3 / h, bottom blowing argon, argon flow rate of 45 N m 3 / h, the pressure is 0.5MPa, so that the molten steel end component is: C: ≥0.08wt%, P: ≤0.010wt%, the converter steel out temperature is 1600 °C, the steel out process is added to the ladle in the order of addition of artificial graphite 1068kg, silicon manganese 1320kg, ferrosilicon 360kg, high carbon chromium 468kg and white ash 300kg; of which the content of silicon in the manganese alloy is 17wt%, the content of manganese is 68wt, and the content of silicon in ferrosilicon is 72wt%, The Cr content in high carbon ferrochrome w...

Embodiment 4

[0053] A large specification high-strength prestressed steel wire preparation process, the prestressed steel composition is the same as Example 2, and the difference from Example 2 is that the converter smelting part is different, as follows:

[0054]Converter smelting: In the process of steelmaking, the top and bottom blowing method is used for smelting, the top blowing oxygen pressure is 0.8MPa, and the oxygen gun flow rate is 30000Nm 3 / h, bottom blowing argon, argon flow rate of 50N m 3 / h, the pressure is 0.6MPa, so that the molten steel end component is: C: ≥0.08wt%, P: ≤0.010wt%, the converter steel out temperature is 1630 °C, the steel out process is sequentially added to the ladle artificial graphite 1152kg, silicon manganese 1500kg, ferrosilicon 480kg, high carbon chromium 540kg and white ash 300kg; of which the content of silicon in silicon manganese alloy is 17wt%, the content of manganese is 68wt, and the content of silicon in ferrosilicon is 72wt. The Cr content in h...

Embodiment 5

[0057] A large specification high-strength prestressed steel coil preparation process, prestressed steel composition and Example 2 is the same, and the difference from Example 2 is that the LF furnace refining part is different, as follows:

[0058] (2) LF furnace refining:

[0059] (21) Under the condition that the blowing argon flow rate is 150L / min and the argon pressure is 0.4MPa, the molten steel in the ladle enters the LF furnace, and under the condition that the blowing argon flow rate is 350L / min and the argon pressure is 0.4MPa, the electrochemical slagging: the current is 35000A, the voltage is 300V, the slag is heated for 10min, the temperature sampling analysis composition (to ensure that the three-minute sample temperature is > 1510 °C) after the temperature sampling, according to the results according to the target prestressed steel components are added to the ferrosilicon and silica manganese 3. High carbon ferrochrome, artificial graphite, ferrovanadium, etc. for l...

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Abstract

The application relates to the field of steel production and manufacturing, and specifically discloses a large-scale high-strength prestressed steel, a preparation process and its application. The chemical composition of the prestressed steel is: C: 0.86-0.89 wt%, Si: 0.32-0.38 wt%, Mn: 0.76-0.79 wt%, Cr: 0.25-0.29 wt%, V: 0.040-0.050 wt%, Ni: ≤0.10 wt%, Cu: ≤0.20 wt%, P: ≤0.015 wt%, S: ≤0.015 wt%, and the balance is Fe, so as to improve the tensile strength of prestressed steel.

Description

Technical field [0001] The present application relates to the field of steel production and manufacturing, more specifically, it relates to a large specification high-strength prestressed steel, the preparation process and its application. Background [0002] High-strength prestressed steel strand is a widely used type of product in the metal products industry, mainly used in railways, highways, cross-sea bridges, large buildings, water conservancy, mining and other fields, with high tensile strength, good elongation, low relaxation value, small stress loss and excellent fatigue resistance. [0003] Bridge cable belongs to a kind of prestressed steel wire strand, due to the particularity of working conditions and working environment, bridge cable product performance requirements are high, so there are certain requirements for the uniformity of raw material performance, the degree of soxhrositization and inclusions, etc. Domestic steel wire strand enterprises have previously used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/20C22C38/46C22C38/42C22C33/06C21C7/06C21C7/10C21C7/064C21D8/06
CPCC22C38/02C22C38/04C22C38/24C22C38/20C22C38/46C22C38/42C22C33/06C21C7/06C21C7/10C21C7/064C21D8/065
Inventor 李俊峰许志军王忠伟张志新胡守才林在旭杨子江梁玉龙穆春平孙殿新付伟
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD