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Steel for boron-containing prestressed steel wire and steel strand and its smelting process

A technology of prestressed steel wire and steel strand, applied in the field of smelting, can solve problems such as surface cracks of slabs, and achieve the effects of improving the denaturation ability of inclusions, promoting the floating of large-particle inclusions in molten steel, and improving the surface quality of slabs

Active Publication Date: 2016-01-06
ZENITH STEEL GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after adding B element, it is easy to cause cracks on the surface of the slab

Method used

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  • Steel for boron-containing prestressed steel wire and steel strand and its smelting process
  • Steel for boron-containing prestressed steel wire and steel strand and its smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 (furnace number 813100030)

[0030] (1) Add raw materials molten iron, scrap steel and pig iron into the converter, among which, requirements for molten iron: Si: 0.5%, P: 0.1%, S: 0.020, temperature T=1300°C, scrap steel accounted for 10% of the total raw materials; pig iron It accounts for 5% of the total amount of raw materials; the total loading of raw materials is stable at 140t / furnace;

[0031] (2) During the converter smelting process, add slag material dolomite 10t / furnace, and implement high-drawing supplementary blowing operation, and the number of post-blowing is 1 time;

[0032] Tapping, the converter tapping end point C is controlled at 0.4%, the end point P is controlled at 0.015%, the converter tapping temperature is controlled at 1660°C, and 240kg of silicon carbide is added sequentially with the steel flow (based on the amount of raw materials) when tapping 1 / 4 / furnace, silicon-manganese alloy 8.8kg / t, high-carbon ferromanganese 1.5kg / t, hi...

Embodiment 2

[0039] Example 2 (furnace number 813100031)

[0040] (1) Add raw materials molten iron, scrap steel and pig iron into the converter, wherein the requirements for molten iron are: Si: 0.7%, P: 0.11%, S: 0.030, and the rest of the operations are the same as in Example 1.

Embodiment 3

[0041] Example 3 (furnace number 813100032)

[0042] (1) Add raw materials molten iron, scrap steel and pig iron into the converter, wherein the requirements for molten iron are: Si: 0.8%, P: 0.12%, S: 0.025, and the rest of the operations are the same as in Example 1.

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Abstract

The invention belongs to the technical field of smelting, and particularly relates to a smelting process of steel for boron-containing prestressed steel wires and steel strands. The process comprises the following steps: preparing molten iron, waste steel and raw iron serving as raw materials; during smelting of a revolving furnace, adding slag charge, performing the operation of raising high carbon content and post blowing, controlling the end point C over 0.4 percent, and controlling the end point P below 0.015 percent; during steel tapping of the revolving furnace, adding silicon carbide, lime and an alloy serving as deoxidizing materials in sequence along with the steel flow; during refining, deoxidizing the top of the slag by adopting the silicon carbide, wherein the target refining final alkalinity is 1.7; after refining, performing soft argon blowing at the bottom of a steel ladle; during continuous casting, feeding Xibao special high-carbon steel protection slag to a crystallizer; and electromagnetically stirring the crystallizer, casting at a low superheat degree, performing forced cooling during secondary cooling, and electromagnetically stirring at the tail end. By adopting the smelted steel for the boron-containing prestressed steel wires and the steel strands, qualification of chemical components can be ensured. During pulling and twisting of parent metal, the fracture times due to generic defects, sundries and carbon segregation on the surface of a casting blank can be reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a prestressed steel and a preparation method thereof. Background technique [0002] Steel wires and steel strands for high-strength and low-relaxation prestressed concrete structures are high-performance steel materials, widely used in high-rise buildings, long-span bridges, petrochemical and railway engineering fields, with high strength, high toughness, low relaxation, and corrosion resistance And other performance, are high-tech content, high value-added hard line products. [0003] At present, steel wires and steel strands for 1860-grade prestressed concrete structures are used the most in the market. The main raw materials for the production of such products are hot-rolled wire rods with a diameter of Φ11-13 mm, which are drawn and twisted into prestressed steel wires and steel strands. . Since the user no longer conducts lead bath treatment on the wire rod be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/00C21C5/28C21C7/04
CPCY02P10/20
Inventor 叶玉奎仝太钦冷永磊孙光涛张正林桂仲林
Owner ZENITH STEEL GROUP CORP
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