Steel for boron-containing prestressed steel wires and steel strands and smelting process thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A prestressed steel wire and steel strand technology, applied in the field of smelting, can solve problems such as cracks on the surface of the slab, achieve the effect of improving the denaturation ability of inclusions, improving the surface quality of slabs, and promoting the floating of large particles of inclusions in molten steel
Active Publication Date: 2014-06-04
ZENITH STEEL GROUP CORP
View PDF3 Cites 11 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, after adding B element, it is easy to cause cracks on the surface of the slab
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
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.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
melting point
aaaaa
aaaaa
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more