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High carbon steel wire rod excellent in wire drawing workability and manufacturing method thereof

A technology of wire drawing processing and manufacturing method, applied in the field of high carbon steel wire rod, can solve the problem of lack of clear tissue factor, etc., and achieve the effect of excellent wire drawing processing characteristics

Inactive Publication Date: 2018-01-16
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, regarding the bainite wire, heat treatment for controlling the structure ratio is disclosed, but the structure factor for stably lowering the strength is not clarified.

Method used

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  • High carbon steel wire rod excellent in wire drawing workability and manufacturing method thereof
  • High carbon steel wire rod excellent in wire drawing workability and manufacturing method thereof
  • High carbon steel wire rod excellent in wire drawing workability and manufacturing method thereof

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Experimental program
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Effect test

Embodiment

[0097] The bainite transformation was completed by holding the wire rods having the composition A to O shown in Table 1 at a predetermined temperature shown in "Cooling Conditions" shown in Table 2-1 for a predetermined time. The heat treatment was performed by heating the wire rods after completion of bainite transformation to a predetermined temperature shown in "Heat treatment conditions after completion of bainite transformation", and maintaining the predetermined temperature for a predetermined time. Table 2-2 shows the measurement results of the tensile strength TS (MPa) and the reduction of area (%) of the heat-treated wire rod, and the ratio of the bainite structure and the ferrite phase in the bainite structure. The measurement results of the half peak width and the distribution of the hardness of the cross-section of the wire rod. In addition, regarding the transformation time of bainite, in the case of directly heat-treating the hot-rolled wire rod, it is appropriat...

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PUM

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Abstract

The present invention provides a wire rod having stable and good wire-drawing characteristics in actual manufacture and a method for manufacturing the wire rod. The wire rod is characterized in that its component composition contains, in mass %, C: 0.7 to 1.2%, Si: 0.1 to 1.5%, Mn: 1.0% or less, N: 0.005 ppm or less, and the balance contains Fe and unavoidable impurities. , more than 80% of the cross-section of the wire rod is a bainite structure, and the rest of the structure is a non-bainite structure, and the half-width of the (211) crystal plane of the ferrite phase in the structure of the wire rod cross-section is 0.6° Hereinafter, the tensile strength TS (MPa) and the reduction of area RA (%) respectively satisfy the following formula (1) and the following formula (2), and the standard deviation of the hardness distribution in the cross section is expressed as Vickers hardness (Hv) Count less than 6. TS≤580+700×[C]…(1); RA≥100‑46×[C]‑18×[Mn]‑10×[Cr]…(2).

Description

technical field [0001] The present invention relates to a high-carbon steel wire rod that needs to be drawn once before final toughening or oil tempering, or a high-carbon steel wire rod for ACSR (Aluminum Conductor Steel Reinforced: Aluminum Conductor Steel Reinforced) and rope (rope), and a manufacturing method thereof . Background technique [0002] In the secondary processing of wire rods, drawing is mainly used effectively, and pearlitic steel heat-treated by the Stelmor method or lead bath toughening is generally used. In particular, STC (Steel Cord: steel cord) ultra-fine wires and thin-diameter ropes are manufactured by performing intermediate toughening in order to reduce the diameter to a predetermined wire diameter, or reducing the diameter of the rolled wire. Diameterization to reduce wire drawing strain; and so on. [0003] On the other hand, it is known to make effective use of low-strength pearlite structure and / or bainite structure as a method of increasing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/06C21D9/52C22C38/04C22C38/54
CPCC21D8/06C21D8/065C21D9/52C21D9/64C21D2211/002C22C38/00C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/20C22C38/24
Inventor 真锅敏之多田达诚平上大辅矶新佐原进
Owner NIPPON STEEL CORP