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Wire rod excellent in weldability and manufacturing method thereof

A manufacturing method and welding technology are applied in the field of wire rods with excellent weldability and their manufacturing fields, which can solve the problems of fracture of the welded part and the inability to meet the physical properties of the product, and achieve the effect of suppressing the fracture and reducing the manufacturing cost.

Active Publication Date: 2019-06-14
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such inclusions will not only affect wire drawing and rolling, but also when tensile load is applied after welding on the same processing line, it will induce fracture of the welded part, resulting in failure to meet the physical properties required by the product

Method used

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  • Wire rod excellent in weldability and manufacturing method thereof
  • Wire rod excellent in weldability and manufacturing method thereof
  • Wire rod excellent in weldability and manufacturing method thereof

Examples

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Embodiment

[0070] A typical JIS-SWRS35B carbon steel which has the composition shown in the following Table 1 and is currently used as an armored cable was used. However, since P and S are impurities, and both of the invention examples and the comparative examples satisfy 0.010 wt % or less of P and 0.010 wt % or less of S, they are not indicated separately in Table 1.

[0071] The above-mentioned steel grades were tapped in an amount of 300 tons, and then subjected to secondary refining under normal conditions, and desulfurized by bubbling steel at a level of basicity of 3 to 5 in a ladle. After desulfurization, vacuum degassing was performed by the RH method, and in order to prevent clogging of the tundish nozzle, a Ca-Si wire was introduced and controlled so as to have the Ca content described in Table 1.

[0072] After the Ca-Si wire was put into the wire, it was retained for the RH retention time described in Table 1, and then the continuous casting slab was rolled with a 160 (mm) ×...

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Abstract

One aspect of the present invention comprises: 0.32-0.72 wt% of C; 0.2-0.3 wt% of Si; 0.6-0.9 wt% of Mn; 0.0001-0.002 wt% of Ca; 0.01 wt% or less of P; 0.01 wt% or less of S; and the remaining consisting of Fe and unavoidable impurities. The present invention relates to the wire material with excellent weldability, wherein Ca composite inclusions having an area of at least 700 [mu]m<2> in a zone within 1 / 4*D (D: a diameter of the wire material measured in mm) from a center of a wire material which exists to be below or equal to 200 units / g.

Description

technical field [0001] The present invention relates to a wire rod excellent in weldability and a method for producing the same. In more detail, it relates to the wire rod excellent in weldability which can be suitably used for an armored cable (Armor cable), a sealed wire rope (Locked coil), etc., and its manufacturing method. Background technique [0002] Armored cables, sealed wire ropes, etc. are used to transport crude oil, etc. Flexible pipes, etc., their use is to support floating production storage and equipment (FPSO, Floating Production Storage and Outfitting) or oil production platform (Production Platform), etc. Floating structures are connected to pipelines on the ocean floor. [0003] Generally speaking, the steel grades used in armored cables are piano steels with a carbon content of 0.3 to 0.7%. The most representative ones are SWRS32B to 72B, which are standard steels of Japanese Industrial Standards (JIS). The SWRS 32B to 72B contain 0.2 to 0.3% of Si and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C21C7/10C21C7/00
CPCC21C7/0056C21C7/10C21D2211/005C22C38/02C22C38/04
Inventor 杨裕燮朴焌学
Owner 浦项股份有限公司