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Ni alloy clad steel excellent in intergranular corrosion resistance and manufacturing method thereof

A technology of intergranular corrosion and cladding steel, applied in the direction of manufacturing tools, metal rolling, metal layered products, etc., can solve the problems of poor mechanical properties, coarse grains of low-alloy steel, etc., and achieve excellent resistance to intergranular corrosion. Effects of Features

Active Publication Date: 2018-07-31
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of clad steel, if the heating is kept at a high temperature to melt the precipitates, there is a problem that the crystal grains of the low alloy steel of the base material will be coarsened and the mechanical properties will be significantly deteriorated.

Method used

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  • Ni alloy clad steel excellent in intergranular corrosion resistance and manufacturing method thereof
  • Ni alloy clad steel excellent in intergranular corrosion resistance and manufacturing method thereof
  • Ni alloy clad steel excellent in intergranular corrosion resistance and manufacturing method thereof

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Experimental program
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Embodiment 1

[0091] Hereinafter, examples of the present invention will be described in comparison with comparative examples.

[0092] The clad material and the base material were fabricated using 13 types of clad material steels (10 types of invention steels and 3 types of comparative steels) and 2 types of base materials shown in Table 1. The clad steel was fabricated using the clad material and the base material, and the amount of precipitated Cr and the intergranular corrosion resistance were studied. The billet of clad steel using each clad material was heated at a heating temperature of 1100°C, and then rolling was started. 2.5, End rolling at 750°C, immediately start accelerated cooling at a cooling rate of 5°C / sec, and end accelerated cooling at 350°C. The results are shown in Table 2.

[0093]

[0094]

[0095] The cladding materials Nos. 1 to 10 of the invention steels had a precipitated Cr amount of 0.030% or less, and showed good intergranular corrosion resistance. On ...

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Abstract

The present invention provides a Ni alloy clad steel excellent in intergranular corrosion resistance and a manufacturing method thereof. The Ni alloy clad steel excellent in intergranular corrosion resistance is characterized in that the amount of Cr existing as carbide in the clad material made of Ni alloy is 0.030% or less in mass %.

Description

technical field [0001] The present invention relates to a nickel-base alloy-clad steel plate excellent in intergranular corrosion resistance (nickel-base alloy-clad steel plate) and a manufacturing method thereof. Background technique [0002] In recent years, due to energy issues, the development of energy resources has been promoted even in difficult-to-exploitation environments that have been difficult to extract in the past. For such difficult-to-mining environments, particularly severe corrosive environments, there is an increasing demand for high-alloy clad steel (CRA (Corrosion Resistant Alloy) clad steel) with superior corrosion resistance. Furthermore, for industrial equipment and structures used in difficult-to-mine environments, durability, long life, and maintenance-free are desired, and Ni alloys represented by Alloy 625 and 825 are attracting attention as materials meeting these needs. [0003] On the other hand, the prices of Ni, the main raw material of Ni a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05B21B1/22B21B1/38B23K20/04C22F1/10C21D8/02C22C38/00C22C38/58C22F1/00
CPCB21B1/22B21B1/38C21D8/02C22C38/00C22C38/58C22F1/00C22F1/10C22C19/055C21D8/1261C21D2251/02B32B15/015C22C19/057C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 黑沼洋太矢泽好弘岸庆一郎橘俊一三田尾真司横田智之
Owner JFE STEEL CORP