Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and manufacture method thereof

A technology of soil corrosion and steel sheet piles, applied in metal rolling, manufacturing converters, etc., to achieve the effects of simple production process, favorable promotion, and excellent corrosion performance

Inactive Publication Date: 2011-06-15
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before the present invention, none of the patents disclosed at home and abroad related to the corrosion resistance of hot-rolled steel sheet piles in alkaline soil

Method used

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  • Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet pile and manufacture method thereof

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Comparison scheme
Effect test

Embodiment 1

[0023] Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet piles, its chemical composition and weight percentage are: C 0.15%, Mn 0.8%, Si 0.10%, S 0.020%, P 0.0195%, Cu 0.2%, Ni 0.1 %, the rest is Fe and unavoidable impurities.

[0024] A method for producing steel for hot-rolled U-shaped steel sheet piles resistant to alkaline soil corrosion, the steps of which are:

[0025] 1) Smelting and refining in a converter: the controlled final slag basicity R is 2;

[0026] 2) Continuous casting: In order to prevent the molten steel from tumbling and slag rolling during casting, the depth of the long nozzle inserted into the mold is controlled at 100 mm;

[0027] 3) Heating the continuous casting slab to 1050-1060°C;

[0028] 4) Carry out rolling: control the rolling start temperature at 1020-1030° C., and roll at 1082° C. below the melting point of copper at 1083° C.

Embodiment 2

[0030] Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet piles, its chemical composition and weight percentage are: C 0.175%, Mn 0.91%, Si 0.19%, S 0.0195%, P 0.0192%, Cu 0.28%, Ni 0.14 %, the rest is Fe and unavoidable impurities.

[0031] A method for producing steel for hot-rolled U-shaped steel sheet piles resistant to alkaline soil corrosion, the steps of which are:

[0032] 1) Smelting and refining in a converter: the controlled final slag basicity R is 2.9;

[0033] 2) Continuous casting: In order to prevent the molten steel from tumbling and slag rolling during casting, the depth of the long nozzle inserted into the mold is controlled at 150 mm;

[0034] 3) Heating the continuous casting slab to 1065-1080°C;

[0035] 4) Carry out rolling: control the rolling start temperature at 1035-1050° C., and roll at 1080° C. below the melting point of copper at 1083° C.

Embodiment 3

[0037] Alkaline soil corrosion-resistant steel for hot-rolled U-shaped steel sheet piles, its chemical composition and weight percentage are: C 0.21%, Mn 1.1%, Si 0.296%, S 0.0192%, P 0.0192%, Cu 0.36%, Ni 0.18% , and the rest are Fe and unavoidable impurities.

[0038] A method for producing steel for hot-rolled U-shaped steel sheet piles resistant to alkaline soil corrosion, the steps of which are:

[0039] 1) Smelting and refining in a converter: the controlled final slag basicity R is 3.8;

[0040] 2) Continuous casting: In order to prevent the molten steel from tumbling and slag rolling during casting, the depth of the long nozzle inserted into the mold is controlled at 200 mm;

[0041] 3) Heating the continuous casting slab to 1095-1105°C;

[0042] 4) Carry out rolling: control the rolling start temperature at 1055-1070° C., and the rolling temperature is rolled at 1075° C. below the melting point temperature of copper of 1083° C.

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Abstract

The invention relates to a manufacture method of alkaline soil corrosion-resistant steel for a hot-rolled U-shaped steel sheet pile. The manufacture method comprises the steps of: smelting in a converter and refining; controlling the chemical composition and the weight percentage of the molten steel after refining as follows: 0.15-0.26% of C, 0.8-1.4% of Mn, 0.10-0.6% of Si, less than or equal to 0.020% of S, less than or equal to 0.02% of P, 0.2-0.5% of Cu, 0.1-0,25% of Ni, and the balance Fe and unavoidable impurities; controlling the alkalinity R of final slag to be at 2-5; continually casting; controlling the depth that a long water opening is inserted into a crystallizer to be at 100-300mm; heating a continually-cast blank at 1050-1150 DEG C; and rolling, wherein the rolling temperature is 1020-1100 DEG C, and the rolling is performed under the melting point temperature of the copper less than 1083 DEG C. The alkaline soil corrosion-resistant steel can not generate the phenomena of steel water overturning and slag entrapment when being cast, has good alkaline soil corrosion resistance, and meets the requirement of the corrosion resistance of the hot-rolled steel sheet pile when being used in the alkaline soil.

Description

technical field [0001] The invention relates to steel for steel sheet piles and a production method thereof, in particular to steel for hot-rolled U-shaped steel sheet piles resistant to alkaline soil corrosion and a production method thereof. Background technique [0002] The corrosion of steel plates in soil is one of the most important corrosion problems. Soil can be said to be the most complex corrosion medium. The physical and chemical properties of different soils, such as salt content, water absorption, and microbial activity, vary greatly. It is composed of a gas, A complex system composed of liquid and solid three-phase substances. Due to its special structure, steel sheet piles have unique advantages: high strength, light weight, and good water-proof performance; strong durability, with a service life of 20-50 years; reusable, generally 3-5 times; remarkable environmental protection effect , it can greatly reduce the amount of soil borrowed and concrete used durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46C22C38/16B22D11/16C21C5/36
Inventor 任安超桂美文吴杰范敬国吉玉程正钢朱敏周剑华鲁明正
Owner 武钢集团有限公司
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