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High weather resistance steel

A technology of high weather resistance and weather resistance steel, which is applied in the field of high weather resistance steel, can solve the problems of high yield strength and high weather resistance steel, and achieve the effect of low production cost

Inactive Publication Date: 2010-12-08
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, no high weathering steel with high yield strength and good elongation has been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Use ladle refining furnace, ie LF furnace to smelt the high weathering steel proposed by the present invention, or adopt the combination of LF furnace and RH vacuum circulation degassing method to refine the high niobium pipeline steel proposed by the present invention, and pass the The alloy feeding system adds fine-tuning alloys to the LF furnace, and makes the weight percentage of each trace alloy in the molten steel: manganese 1.95%; niobium 0.09%; titanium 0.15%; molybdenum 0.15%; nitrogen 0.005%; chromium 0.40%; phosphorus 0.015 %; aluminum or aluminum oxide 0.035%; the balance is iron and unavoidable impurities. Wherein, the impurities include: 0.10% silicon; 0.008% sulfur; 0.07% carbon.

Embodiment 2

[0012] Refining high weathering steel according to the method of embodiment 1, and make the percentage by weight of each trace alloy in molten steel be: manganese 2.10%; Niobium 0.07%; Titanium 0.13%; Molybdenum 0.25%; Nitrogen 0.004%; Chromium 0.55%; %; aluminum 0.015; the balance is iron and unavoidable impurities. Wherein, the impurities include: 0.20% silicon; 0.006% sulfur; 0.05% carbon.

Embodiment 3

[0014] Refining high weathering steel according to the method of embodiment 1, and make the percentage by weight of each trace alloy in molten steel be: manganese 2.00%; Niobium 0.08%; Titanium 0.14%; Molybdenum 0.20%; Nitrogen 0.003%; Chromium 0.50%; %; aluminum 0.025; the balance is iron and unavoidable impurities. Wherein, the impurities include: 0.20% silicon; 0.006% sulfur; 0.05% carbon.

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Abstract

The invention relates to high weathering steel, which comprises the following materials by weight percentage: manganese, niobium, titanium, molybdenum, nitrogen, phosphorus, chromium, iron and unavoidable impurities. The high weathering steel does not contain copper, contains relatively less phosphorus, so the high weathering steel is protected from hot embrittlement, and the surface of the steelis prevented from crackle forming; and through tests to a steel plate with a thickness of between 3.0 and 6.0 mm, the yield strength of the high weathering steel of between 750 and 830MPa is far higher than that of the prior high weathering steel, and the elongation percentage of the high weathering steel can reach 13 percent. Furthermore, except the manganese with lower cost as a trace metal element added into the high weathering steel, gross of other elements added into the high weathering steel is less than 1 percent, so the high weathering steel has lower manufacture cost.

Description

Technical field: [0001] The invention relates to a high weather-resistant steel. Background technique: [0002] Weathering steel is a low-alloy structural steel used to manufacture steel structures such as vehicles, containers, bridge towers, etc. This type of steel has the ability to protect the rust layer and resist atmospheric corrosion. In the prior art, it is generally believed that copper can activate the cathode in the process of atmospheric corrosion, and promote the anode passivation of steel, thereby slowing down the corrosion of the air. 0.2-0.5% copper. However, when copper is heated in an oxidizing atmosphere, it can form a copper-rich layer on the surface of the steel. When the copper reaches the melting temperature, it will be enriched under the scale to form a liquid copper layer and erode the grain boundaries of the steel surface layer, and then thermal embrittlement occurs. Cracks occur on the steel surface; at the same time, it is also believed that phos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38
Inventor 文小明赵迪刘志璞郑中李德君汪海涛
Owner BENGANG STEEL PLATES
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