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Steel casting product for a welding structure and method of manufacturing the same

A technology for a welded structure and a manufacturing method, applied in the field of steel castings for welded structures and their manufacturing, can solve problems such as preheating and postheating that are difficult to manage preheating and postheating conditions

Inactive Publication Date: 2017-07-28
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Large-scale steel castings used as ship hull members such as rudder horns and neck bearings are often welded outdoors, making it difficult to manage preheating and postheating conditions and carry out this process. preheating and afterheating

Method used

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  • Steel casting product for a welding structure and method of manufacturing the same
  • Steel casting product for a welding structure and method of manufacturing the same

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Embodiment approach

[0069] The above-mentioned embodiments do not limit the configuration of the present invention. Therefore, the above-mentioned embodiments should be interpreted as omission, replacement, or addition of each constituent element of the above-mentioned embodiment can be performed based on the description of this specification and technical common sense, and these forms all belong to the scope of the present invention.

[0070] For example, the cast steel for welded structure may contain unavoidable impurities other than P, S, and Cu, for example, may contain O (oxygen), H (hydrogen) and the like as unavoidable impurities.

[0071] As described above in detail, the steel casting for welded structures according to one aspect of the present invention has a composition containing C: not less than 0.10% by mass and not more than 0.17% by mass, Si: not less than 0.01% by mass and not more than 0.40% by mass, Mn : 0.7% by mass to 1.4% by mass, Ni: 1.00% by mass to 2.00% by mass, Cr: 0.2...

Embodiment 1～4 and comparative example 1～5

[0080] Examples 1 to 4 and Comparative Examples 1 to 5 as steel castings for welded structures contain C, Si, Mn, Ni, Cr, Mo and V (comparative example 5 also adds Cu) and the balance is iron and Welded structures with unavoidable impurities were casted with cast steel, annealed, and tempered to obtain prototypes of steel casts for welded structures.

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Abstract

The invention provides a steel casting product for a welding structure and a method of manufacturing the same. A steel casting product for a welding structure according to the present invention comprises: C of 0.10 mass% or more and 0.17 mass% or less; Si of 0.01 mass% or more and 0.40 mass% or less; Mn of 0.7 mass% or more and 1.4 mass% or less; Ni of 1.00 mass% or more and 2.00 mass% or less; Cr of 0.20 mass% or more and 0.50 mass% or less; Mo of 0.10 mass% or more and 0.30 mass% or less; V of 0.05 mass% or more and 0.20 mass% or less; and the remainder including Fe and inevitable impurities. A welding crack susceptibility composition Pcm expressed by the following formula (1) is 0.3 or less, a main structure has a metal structure as ferrite and bainite, and potential density is 1.35*10<13>m<-2> or more. Accordingly, it is possible to realize the tensile strength of 550 MPa or more and excellent weldability. Pcm=C+Si / 30+Mn / 20+Cu / 20+Ni / 60+Cr / 20+Mo / 15+V / 10+5B ... (1), in the formula (1), C, Si, Mn, Cu, Ni, Cr, Mo, V, and B represent the content expressed by mass% in case of containing and represent 0 in the case of not containing.

Description

technical field [0001] The invention relates to a steel casting for welded structures and a manufacturing method thereof. Background technique [0002] As steel castings for welded structures having a tensile strength of 550 MPa or more, SCW550 and the like are specified in JIS-G5102 (2015). In order to make steel castings meet such strength, it is usually necessary to increase the amount of alloy. However, when the amount of the alloy is increased, the weldability decreases. As an improvement, it is known that preheating to heat the welded portion to a predetermined temperature or higher before welding, and annealing to remove stress by heating the welded portion after welding (hereinafter, may be simply referred to as post-heating) are known. [0003] Large-scale steel castings used as ship hull members such as rudder horns and neck bearings are often welded outdoors, and it is difficult to manage preheating and postheating conditions and carry out this process. Preheat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C21D1/25C21D6/00
CPCC21D1/25C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/44C22C38/46C21D2211/005C21D2211/002B22D21/00
Inventor 谷和也高冈宏行筱崎智也
Owner KOBE STEEL LTD