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A coated high-strength prestressed steel strand and its manufacturing method

A pre-stressed steel strand, high-strength technology, used in coatings, manufacturing tools, metal material coating processes, etc., can solve the problems of twisting, winding performance can not reach 0.80 or more, and can not be supplied in batches, etc. Achieve the effect of reducing the source of microcracks after welding, improving toughness, uniform composition and structure

Active Publication Date: 2016-05-11
溧阳市万兴特种建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, China's galvanized steel strand industry has developed rapidly, and domestic production technology has been continuously improved. In order to obtain greater investment returns, domestic galvanized steel strand enterprises have continuously improved their production scale and product quality. The requirements for stranded wire are getting higher and higher, specifically in terms of strength, toughness, tensile strength and corrosion resistance. -Hydrochloric acid washing-washing-solvent treatment-drying-hot-dip galvanizing-wiping-receiving-finished products, the produced steel strands are used in daily life, at the same time, domestic and foreign manufacturers use existing high-carbon steel When some specifications of UHV galvanized steel strands are produced, the ratio of 1% elongation stress to tensile strength of the finished galvanized wire cannot reach 0.80 due to fluctuations in the performance of the wire rod (same circle difference > 60MPa). The above, and the torsion and winding performance cannot fully meet the requirements of high-strength galvanized wire and steel strand, and cannot be supplied in batches. It is necessary to develop a new production method for special wire for galvanized steel strand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The weight percentage components of the high-strength prestressed steel strand with coating of the present invention are: the weight percentage components of the coating are: C: 0.60%, Mn: 0.70%, Si: 0.20%, Cu: 0.20%, Cr: 0.1%, P: 0.030%, S: 0.020%, N: 0.0080%, Al: 0.057%, Nb: 0.005%, V: 0.06%, Ti: 0.035%, Ni: 0.05%, Mo: 0.53%, B: 0.007%, Lanthanum: 0.07%, cerium : 0.03%, praseodymium : 0.01%, the rest is Zn.

[0049] The present embodiment is the method for producing a high-strength prestressed steel strand with a coating as claimed in claim 5, comprising the following steps: (1) Hot-dip galvanizing: hot-dip galvanizing is performed on a single steel wire, and the coating of the component is uniformly plated On the surface of the steel wire; (2) The first heat treatment: the coated steel wire is sent to the heating furnace and heated to 670 ° C, the wire is rapidly cooled to 370 ° C through the first cooling process, and then heated to 590 ° C through the tempering ...

Embodiment 2

[0051] The high-strength prestressed steel strand with coating in this embodiment is characterized in that: the weight percentage components of the coating are: C: 0.65%, Mn: 0.75%, Si: 0.25%, Cu: 0.30%, Cr: 0.2%, P: 0.020%, S: 0.010%, N: 0.0070%, Al: 0.058%, Nb: 0.006%, V: 0.07%, Ti: 0.036%, Ni: 0.06%, Mo: 0.54%, B: 0.008%, Lanthanum: 0.08%, cerium : 0.04%, praseodymium : 0.02%, the rest is Zn.

[0052] The method for producing the coated high-strength prestressed steel strand according to the present embodiment is characterized in that it comprises the following steps: (1) Hot-dip plating: performing hot-dip plating on a single steel wire, and uniformly plating the coating of the component on the steel wire Surface; (2) The first heat treatment: the coated steel wire is sent to the heating furnace and heated to 680 ° C, the wire is rapidly cooled to 380 ° C through the first cooling process, and then heated to 600 ° C through the tempering furnace for tempering , and the...

Embodiment 3

[0054] The weight percent of each component in the wire rod for high-strength steel strand with galvanized layer in this embodiment is: high-strength prestressed steel strand with coating, characterized in that: the weight percent component of the coating is: : C: 0.70%, Mn: 0.85%, Si: 0.30%, Cu: 0.40%, Cr: 0.3%, P: 0.010%, S: 0.005%, N: 0.0060%, Al: 0.059%, Nb: 0.007% , V: 0.08%, Ti: 0.037%, Ni: 0.07%, Mo: 0.55%, B: 0.009%, Lan: 0.09%, cerium : 0.05%, praseodymium : 0.03%, the rest is Zn.

[0055] The method for producing the coated high-strength prestressed steel strand according to the present embodiment is characterized in that it comprises the following steps: (1) Hot-dip plating: performing hot-dip plating on a single steel wire, and uniformly plating the coating of the component on the steel wire Surface; (2) The first heat treatment: the coated steel wire is sent to the heating furnace and heated to 690 ° C, the wire is rapidly cooled to 390 ° C through the first co...

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PUM

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Abstract

The invention discloses a high-strength pre-stressed steel strand with a coating. The coating comprises the following components in percentage by weight: 0.60%-0.70% of C, 0.70%-0.85% of Mn, 0.20%-0.30% of Si, 0.20%-0.40% of Cu, 0.1%-0.3% of Cr, 0-0.030% of P, 0-0.020% of S, 0-0.0080% of N, 0.057%-0.059% of Al, 0.005%-0.007% of Nb, 0.06%-0.08% of V, 0.035%-0.037% of Ti, 0.05%-0.07% of Ni, 0.53%-0.55% of Mo, 0.007%-0.009% of B, 0.07%-0.09% of La, 0.03%-0.05% of Ce, 0.01%-0.03% of Pr and the balance of Zn, Fe and inevitable impurities. The steel strand has the characteristics of high steel purity, uniform component and tissue, and good stress distribution performance.

Description

technical field [0001] The invention relates to a galvanized steel strand, in particular to a high-strength prestressed steel strand with a coating and a manufacturing method thereof. Background technique [0002] In recent years, China's galvanized steel strand industry has developed rapidly, and domestic production technology has been continuously improved. In order to obtain greater investment returns, domestic galvanized steel strand enterprises have continuously improved their production scale and product quality. The requirements for strands are also getting higher and higher. Specifically, in terms of strength, toughness, tensile strength and corrosion resistance, the technological process of galvanized steel strands is: pay-off - degreasing (alkali washing) - hot water washing - water washing - Hydrochloric acid washing - water washing - solvent treatment - drying - hot-dip galvanizing - wiping - reeling - finished product, the steel strand produced is used in daily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/00C23C2/06C21D9/52
Inventor 姚圣法吴海洋
Owner 溧阳市万兴特种建材有限公司