1080MPa high-strength corrosion-resistance twisted steel for prestressed structure and preparation method of 1080MPa high-strength corrosion-resistance twisted steel

A technology of prestressed structure and threaded steel bar, applied in the field of metal material processing, can solve the problems of rapid change in hardness from the surface to the core, large performance fluctuation, difficult to produce mechanical properties and stress relaxation properties, etc. Excellent relaxation properties and improved strength

Active Publication Date: 2015-08-12
WUKUN STEEL
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different design components, processing equipment and production and processing technology, the surface structure of the produced prestressed threaded steel bar is tempered sorbite, and the ferrite network structure is prone to appear in the center, resulting in a rapid change in hardness from the surface layer to the center, and the product has poor performance. Large fluctuations, only 785MPa, 830 MPa, and 930 MPa grade prestressed steel bars can be produced, and it is difficult to produce 1080MPa grade high-strength prestressed rebars with excellent mechanical properties and stress relaxation properties and corrosion resistance

Method used

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  • 1080MPa high-strength corrosion-resistance twisted steel for prestressed structure and preparation method of 1080MPa high-strength corrosion-resistance twisted steel
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  • 1080MPa high-strength corrosion-resistance twisted steel for prestressed structure and preparation method of 1080MPa high-strength corrosion-resistance twisted steel

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preparation example Construction

[0021] The preparation method of the 1080MPa grade high-strength corrosion-resistant prestressed prestressed structural threaded steel bar according to the present invention includes molten iron converter smelting, molten steel deoxidation alloying, molten steel LF furnace refining, molten steel VD vacuum refining, molten steel casting, billet heating, and billet controlled rolling Cooling control, steel post-processing steps, including:

[0022] A molten iron converter smelting: According to the amount of 1060 kg / t steel, add low-sulfur phosphorus molten iron in the following mass ratios to the LD converter: C 4.5~5.0wt%, Si 0.30~0.50wt%, Mn 0.25~0.50wt%, P 0.060 ~0.090wt%, S≤0.015wt%, the rest is Fe and unavoidable impurities; according to the amount of 45kg / t steel, add refined steel scrap in the following mass ratio to the LD converter: C 0.17-0.25wt%, Si 0.30 -0.55wt%, Mn 1.15-1.50wt%, P 0.020~0.040wt%, S 0.015~0.030wt%, the rest is Fe and unavoidable impurities; The fol...

Embodiment 1

[0033] A molten iron converter smelting: according to the amount of 1060 kg / t steel, add low-sulfur phosphorus molten iron in the following mass ratios to the LD converter: C 4.5wt%, Si 0.30wt%, Mn 0.25wt%, P 0.060wt%, S 0.010wt% %, the rest is Fe and unavoidable impurities; according to the amount of 45kg / t steel, add the following mass ratio of refined steel scrap to the LD converter: C 0.17wt%, Si 0.30wt%, Mn 1.15wt%, P 0.020wt %, S 0.015wt%, the rest is Fe and unavoidable impurities; according to the amount of 1.30kg / t steel, add nickel-iron alloy with the following mass ratio to the LD converter: Ni 99.3wt%, the rest is Fe and unavoidable impurities Impurities: After adding low-sulfur phosphorus molten iron, refined steel scrap, and ferronickel into the LD converter, carry out conventional top-bottom composite blowing, add conventional lime, dolomite, and magnesite balls to make slag, and the amount of lime added is 45kg / t steel, Baiyun The amount of stone added is 10kg / t...

Embodiment 2

[0046] A molten iron converter smelting: According to the amount of 1060 kg / t steel, add the following mass ratio of low-sulfur phosphorus molten iron to the LD converter: C 4.8wt%, Si 0.40wt%, Mn 0.38wt%, P 0.075wt%, S 0.012wt% %, the rest is Fe and unavoidable impurities; according to the amount of 45kg / t steel, add the following mass ratio of refined steel scrap to the LD converter: C 0.21wt%, Si 0.42wt%, Mn 1.30wt%, P 0.030wt %, S 0.028wt%, the rest is Fe and unavoidable impurities; according to the amount of 2.10 kg / t steel, add nickel-iron alloy with the following mass ratio to the LD converter: Ni 99.3wt%, the rest is Fe and unavoidable Impurities: After adding low-sulfur phosphorus molten iron, refined steel scrap, and ferronickel into the LD converter, carry out conventional top-bottom compound blowing, add conventional lime, dolomite, and magnesite balls to make slag, and the amount of lime added is 50kg / t steel, Baiyun The amount of stone added is 15kg / t steel, the ...

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Abstract

The invention discloses 1080MPa high-strength corrosion-resistance twisted steel for a prestressed structure and a preparation method of the 1080MPa high-strength corrosion-resistance twisted steel. The 1080MPa high-strength corrosion-resistance twisted steel for the prestressed structure is characterized by being composed of 0.50-0.60wt% of C, 1.25-1.50wt% of Si, 1.20-1.40wt% of Mn, 0.40-0.60wt% of Cr, 0.040-0.070wt% of Mo, 0.040-0.070wt% of Ti, 0.15-0.30wt% of Ni, at most 0.010wt% of S, at most 0.015wt% of P and the rest of Fe and unavoidable impurities. The preparation method includes billet preparation, rolling, aftertreatment and the like, control of amount, size and distribution of the impurities is realized, and cracking of billets is avoided due to hot delivery of casting blanks. Due to addition of Cr, Ni and Mo alloy elements to the steel, hardenability and corrosion resistance are improved, and crack initiation is prevented. Owing to controlled rolling and cooling, grain refinement of rebar structures is realized, and ferrite network structures of core portions are reduced. The twisted steel has the advantages of high toughness, high corrosion resistance and excellent prestressing looseness and is capable of keeping stable performances in various atmospheric environments for a long term to guarantee stability in long-term use of anchored objects.

Description

Technical field [0001] The present invention is the field of metal material processing technology, which involves a threaded steel bar and its preparation method for a 1080MPA -level high -strength corrosion -resistant prestressing structure. Background technique [0002] The prestressed structure is referred to as high -strength fine -rolled threaded steel bars for abbreviations, referred to as fine -rolled threaded steel bars. It has the advantages of high strength, connection, tensor, anchoring, and no need to perform cold pulls and welding during construction, and simple construction.Fine -rolled nuts are widely used in the continuous beams and large -scale frame structures of large water conservancy, industrial and civil buildings, highways, railway large -medium cross bridges, nuclear power plants and other prestressed concrete structures and rock soil anchoring. [0003] The chemical composition of refined rolling threaded steel has no uniform component requirements in Chi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C33/04
Inventor 张瑜陈伟赵宇张卫强李金柱吴光耀杨春雷王文峰赵卫东
Owner WUKUN STEEL
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