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Ultra-low carbon hot rolling weather-resisting steel with yield strength more than 450MPa

A yield strength, ultra-low carbon technology, applied in the field of low-alloy steel manufacturing, can solve the problems of poor mechanical properties, poor atmospheric corrosion resistance, and high C content, and achieve the effects of excellent mechanical properties, simple chemical composition, and improved corrosion resistance.

Inactive Publication Date: 2008-08-06
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the shortcomings of existing weathering steels such as poor mechanical properties, poor atmospheric corrosion resistance, and high C content. The invention provides an ultra-low carbon hot-rolled weathering steel with a yield strength greater than 450 MPa. The strength level of the invention is higher than that of traditional weathering steels. Steel with excellent low temperature impact toughness, weldability and atmospheric corrosion resistance, and adopts ultra-low carbon design

Method used

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  • Ultra-low carbon hot rolling weather-resisting steel with yield strength more than 450MPa
  • Ultra-low carbon hot rolling weather-resisting steel with yield strength more than 450MPa
  • Ultra-low carbon hot rolling weather-resisting steel with yield strength more than 450MPa

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Embodiment 1

[0030] According to the above production process, steel 1 was produced, wherein the chemical composition of steel 1 is shown in 1 in Table 1, the mechanical properties of steel 1 are shown in 1 in Table 2, and the atmospheric corrosion resistance results of steel 1 are shown in 1 in Table 3.

Embodiment 2

[0032] According to the above production process, steel 2 is produced, wherein the chemical composition of steel 2 is shown in 2 in Table 1, the mechanical properties of steel 2 are shown in 2 in Table 2, and the atmospheric corrosion resistance results of steel 2 are shown in 2 in Table 3.

Embodiment 3

[0034] According to the above production process, steel 3 is produced, wherein the chemical composition of steel 3 is shown in 3 in Table 1, the mechanical properties of steel 3 are shown in 3 in Table 2, and the atmospheric corrosion resistance results of steel 3 are shown in 3 in Table 3.

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Abstract

The invention provides ultra-low carbon hot rolling weathering steel whose yield strength is more than 450MPa aiming at the defects of existing weathering steel that the mechanical property and the atmospheric corrosion resistance are bad and the C content is over high, which is composed of components with following weight percent: C 0.01-0.05%, Si 0.10-0.40%, Mn 1.50-1.90%, P<=0.02%, S<=0.010%, Cu 0.15-0.55%, Cr 0.20-0.80%, Ni 0.10-0.50%, Mo 0.05-0.50, Nb 0.01-0.05% and Ca 0.0010-0.0020, and allowance is Fe and unavoidable impurity. The strength grade of the steel of the invention is higher than that of traditional steel and the steel has excellent low temperature impact toughness, welding performance and atmospheric corrosion resistance, and adopts ultra-low carbon design, which is beneficial for extending and applying.

Description

technical field [0001] The invention relates to an ultra-low-carbon hot-rolled weathering steel, specifically a weathering steel with a yield strength of 450MP, low-temperature toughness, good cold formability and weldability, and excellent atmospheric corrosion resistance, which belongs to low alloy steel manufacturing field. Background technique [0002] Weathering steel is a low-carbon low-alloy steel, which is widely used in the manufacture of railway vehicles, transmission towers, offshore platforms and long-term outdoor engineering components. At the beginning of this century, the development of my country's railway vehicle manufacturing, transmission towers, offshore platforms and long-term outdoor engineering components put forward high-strength requirements for weathering steel. Especially in order to meet the development requirements of high-speed and heavy-duty railway transportation in my country, it is necessary to increase the strength of weathering steel, red...

Claims

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Application Information

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IPC IPC(8): C22C38/58
Inventor 刘志勇陈吉清陈邦文胡敏宋育来
Owner WUHAN IRON & STEEL (GROUP) CORP
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