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High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof

A manufacturing method and high-strength technology, applied in the direction of temperature control, etc., can solve the problems of increased manufacturing cost, the corrosion resistance of ordinary high-strength weathering steel cannot meet the design service life of 25 years, and the corrosion resistance of steel cannot be greatly improved. Reduce the cost of use and maintenance, excellent atmospheric corrosion resistance, and reduce the effect of self-weight

Active Publication Date: 2009-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the railway department has carried out a comprehensive investigation on the corrosion status of railway freight transport vehicles made of low-alloy weathering steel with the aforementioned composition system. Technical requirements
Studies have shown that the use of auxiliary microalloying elements cannot greatly improve the corrosion resistance of steel, and the use of stainless steel will greatly increase the cost of vehicle manufacturing

Method used

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  • High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof
  • High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof
  • High-corrosion resistant high-strength weather resisting steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Effect of Cr content on the atmospheric corrosion resistance of steel

[0045] In order to quantitatively investigate the effect of adding different amounts of Cr on the atmospheric corrosion resistance of steel, a 50Kg vacuum induction furnace was used to refine high-Cr content weathering steels with a Cr content in the range of 5-9%. The steel plate with a thickness of 5mm was rolled by the rolling control process, and ordinary carbon steel (SS400, Q345B) and different types of traditional weathering steel (09CuPCrNi, CortenA, CortenB, Q400NQR1) were used as comparison samples, according to the periodic infiltration corrosion test of weathering steel for railway The method (TB / T2375-93) carried out a 72h periodic infiltration cycle corrosion experiment.

[0046] The relative corrosion rate of different steel types, that is, the influence of Cr content on the atmospheric corrosion resistance of steel see figure 1 . according to figure 1 It is shown that wh...

Embodiment 2

[0048] 1. Manufacture of steel in this embodiment: through deep desulfurization of molten iron, compound blowing at the top and bottom of converter, refining outside the furnace, continuous casting, reheating of slab, controlled rolling, controlled cooling, coiling, finishing, to obtain the following: For the finished steel with the chemical composition shown in Table 2, the process parameters are shown in Table 6, and the mechanical properties are shown in Table 7.

[0049] Table 2 Chemical composition (wt%) of steel in Example 2

[0050]

[0051] 2. Atmospheric corrosion resistance test: Taking ordinary carbon steel Q345B and high-strength weathering steel Q450NQR1 as comparison samples, a 72h periodic infiltration cyclic corrosion test was carried out according to the periodic infiltration corrosion test method (TB / T2375-93) of weathering steel for railway use. The average corrosion rate is obtained by calculating the weight loss per unit area of ​​the sample, and then t...

Embodiment 3

[0053] 1. Manufacture of steel in this embodiment: through deep desulfurization of molten iron, compound blowing at the top and bottom of converter, refining outside the furnace, continuous casting, reheating of slab, controlled rolling, controlled cooling, coiling, finishing, to obtain the following: For the finished steel with the chemical composition shown in Table 3, the process parameters are shown in Table 6, and the mechanical properties are shown in Table 7.

[0054] Table 3 Chemical composition (wt%) of steel in Example 3

[0055]

[0056] 2. Atmospheric corrosion resistance performance test: the same as described in Example 2.

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Abstract

The invention provides high-corrosion resistance and high-strength weather resistant steel which comprises the following chemical components (in weight percentage): 0.002 percent to 0.005 percent of C, 0.20 percent to 0.40 percent of Si, 0.01 percent to 0.05 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.008 percent of S, 0.01 percent to 0.05 percent of Al, 0.20 percent to 0.40 percent of Cu, 4.50 percent to 5.50 percent of Cr, less than or equal to 0.40 percent of Ni, 0.001 percent to 0.006 percent of Ca, 0.001 percent to 0.006 percent of N, less than or equal to 0.03 percent of Ti, and the rest are Fe and other inevitable impurities. The invention also provides a manufacturing method of the weather resistant steel. The yield strength of the weather resistant steel is more than 700MPa, the extensibility is more than 20 percent and the atmospheric corrosion resistance is higher than that of traditional high-strength weather resistant steel; in addition, the steel can be directly used in atmospheric environment without being coated, and meets the requirements of railway freight car, container and bridge building fields.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and more specifically, the invention relates to a high-corrosion-resistant high-strength weather-resistant steel and a manufacturing method thereof. The high-corrosion-resistant and high-strength weather-resistant steel is suitable for bare installation. Background technique [0002] So far, a number of invention patents have been declared for high-strength weather-resistant steel (or atmospheric corrosion-resistant steel) and its manufacturing methods at home and abroad. For example, domestically there are mainly: [0003] The patent application for "Low Temperature High Toughness Atmospheric Corrosion Resistant Steel with 600MPa Level and Its Manufacturing Method" (Patent Publication No. "CN1718832A") published in 2006 (see Table 1 for chemical composition); [0004] Chinese patent application for "an economical weathering steel" (patent publication number "CN1800428A"); [0005] The ...

Claims

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Application Information

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IPC IPC(8): C22C38/42C22C38/50B21B37/74B21D5/00C21D8/00
Inventor 钱余海李自刚齐慧滨温东辉王炜宋凤明
Owner BAOSHAN IRON & STEEL CO LTD
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