Base metal for high-toughness clad steel plate giving weld with excellent toughness, and process for producing clad steel plate

A technology of composite steel plate and welded part, which is applied in the direction of manufacturing tools, welding equipment, chemical instruments and methods, etc., can solve the problems of increased manufacturing cost and achieve the effect of excellent low temperature toughness

Active Publication Date: 2014-10-01
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method disclosed in Patent Document 3 requires an additional step of reheating to a temperature of 1150° C. or lower, and thus causes an increase in manufacturing cost, and has problems in terms of industrial implementation.

Method used

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  • Base metal for high-toughness clad steel plate giving weld with excellent toughness, and process for producing clad steel plate
  • Base metal for high-toughness clad steel plate giving weld with excellent toughness, and process for producing clad steel plate

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Embodiment

[0089] Hereinafter, examples of the present invention will be described while comparing with comparative examples. Here, the evaluation of weld toughness was performed by a Charpy test. The notch position of the Charpy test piece was set at a position shifted by 3 mm (HAZ 3 mm) from the joint portion which is the boundary between the weld metal and the base metal to the base metal side. Carried out at a test temperature of -20°C. In the present invention, the absorbed energy (vE-20° C.) at -20° C. is 100 J or more as excellent in toughness.

[0090] In addition, the toughness of the base material was evaluated by a DWTT test (drop weight characteristic) at -20°C. In the present invention, the ductile fracture ratio in the DWTT test at -20°C is 85% or more, which means that the toughness of the base material is excellent.

[0091] Using base metals and Alloy625 having the chemical compositions shown in Table 1, clad steel sheets were produced. Regarding the manufacturing co...

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Abstract

The invention provides a base metal for high-toughness clad steel plates that give welds with excellent toughness. The base metal is characterized by containing, in terms of mass%, 0.030-0.10% of C, 0.10-0.30% of Si, 1.00-1.60% of Mn, up to 0.015% of P, up to 0.003% of S, and less than 0.010% of V and further containing one or more elements selected from 0.05-0.50% of Mo, 0.010-0.060% of Nb, 0.005-0.020% of Ti, up to 0.040% of Al, 0.0010-0.0040% of Ca, and 0.0030-0.0060% of N, with the balance being Fe and unavoidable impurities. The base metal is further characterized by having a percent ductile fracture of 85% or higher in a -20 DEG C drop weight tear test (DWTT) and having a value of vE-20 DEG C, measured at a location 3 mm apart from the heat affected zone (HAZ), of 100 J or more.

Description

technical field [0001] The present invention relates to a base metal of a high-toughness clad plate having excellent weld toughness and a method for producing the clad plate. Background technique [0002] In recent years, due to energy problems, energy development has also been carried out in areas called difficult-to-exploitation environments that were previously impossible to extract. Such an environment is a particularly severe corrosive environment (high-corrosive environment), and there is an increasing demand for high-alloy steel clad steel with better corrosion resistance. In addition, as the demand for industrial equipment and structures in a difficult-to-mine environment, aiming at achieving durability, long life, and maintenance-free, Ni-based alloys or Ni alloys represented by Alloy625 and 825 are materials that meet these needs and received attention. [0003] On the other hand, the prices of Ni, which is the main raw material of the Ni alloy, and alloy element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B23K20/04C21D9/00C22C38/14C22C38/58
CPCC22C38/22C22C38/14C22C38/04C22C38/58C22C38/24C22C38/001C22C38/26C22C38/48C22C38/20Y10T428/12972C22C38/44C22C38/06C22C38/38B32B15/01C21D1/25C21D2251/04C22C38/28B23K20/02C21D8/0205C22C38/002C22C38/02C22C38/46C21D2251/02C22C38/42C21D9/08C22C38/00C22C38/50C21D1/18B32B15/015C22C19/03C22C38/08C22C38/12C22C38/16
Inventor 橘俊一矢泽好弘岸庆一郎黑沼洋太星野俊幸西村公宏末吉仁
Owner JFE STEEL CORP
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