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High-energy welded high-toughness steel for resisting corrosion of molten zinc and its preparing process

A large heat input welding and anti-corrosion technology of molten zinc, which is applied in the field of low-alloy steel manufacturing, can solve the problems of low strength and easy tearing, and achieve the effects of improving the yield, ensuring safety and reliability, and excellent toughness

Inactive Publication Date: 2002-04-03
武钢集团有限公司
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Problems solved by technology

Its disadvantage is that the use of this method has great limitations. It is not the steel itself that is in contact with the zinc liquid, but the welding meat of multi-layer submerged arc welding.
Before the present invention, the large-scale zinc pot, large-scale elephant trunk, and hanging arm of the rolling mill were made of zinc liquid corrosion-resistant steel KZF produced by Wuhan Iron and Steel (Group) Company.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Embodiment 1: According to the chemical composition requirements of the steel of the present invention, hot metal is desulfurized, blown in a converter, vacuum treated, and then rolled, and the steel is fired at 1250-1320°C, and the rolling temperature is controlled at 1180-1000°C and below 950°C , cumulative reduction rate ≥ 50%. Subsequently, the steel of the present invention was tested for tensile properties at room temperature and 350°C. The impact toughness of the steel plate at room temperature and the impact toughness of HAZ at room temperature after welding with a large input energy of 60kJ / cm were tested, and compared with the corresponding comparative steel. The data are shown in Table 1. .

[0030] The tensile properties of the steel of the invention at room temperature and 350°C are significantly higher than those of the comparison steel, and the impact toughness at -20°C before the welding heat simulation test is at the same level as that of the comparison ...

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Abstract

A high-toughness steel welded with high linear energy (More than 50 KJ / cm) and resisting molten zinc corrosion is prepared through converter smelting at 1250-1320 deg.C, vacuum treating, and rolling at 1000-1180 deg.c or lower than 950 deg.C and cumulative drafts rate is greater than or aqual to 50%. It features that composite Ti oxide is used to resist high linear energy, the Nb, V, etc. and used for raising strength, and the Cu, Ni, B and RE are used to resist molten zinc corrosion. Its advantages are simple technology with high efficiency, low cost, and high performance of finished steel.

Description

【Technical field】 [0001] The invention relates to a high-toughness anti-corrosion zinc liquid steel for large input energy welding and a production method thereof, belonging to the field of low-alloy steel manufacturing. 【Background technique】 [0002] Before the present invention, only the patent (JP200023986; inventor DAIKUREKK) applied by Nippon Steel Corp. "Using metal fluoride flux to transform into galvanized electroplating with special fluorine content during multi-layer submerged arc welding trough steel". This patent uses special flux to carry out submerged arc welding with large input energy on the galvanizing tank, and the electrolytic tank manufactured has good room temperature and high temperature resistance to zinc liquid corrosion. Its disadvantage is that the use of this method has great limitations, and the contact with the zinc liquid is not the steel itself, but the multi-layer submerged arc welding meat. When manufacturing large-scale zinc pots, large-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14
Inventor 陈晓习天辉董汉雄郭爱民
Owner 武钢集团有限公司
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