不銹鋼合せ鈑の研究(III)

Abstract

In order to utilize stainless-clad steel, specially 18% Cr; 8% Ni stainless clad plate, the authors already reported on manufacturing method and general properties of the clad plate. In this report, the authors studied on welding characteristics, oxygen-acetylene gas cutting properties and corrosion resistance of stainless clad plate. Results of these tests were summalized as follows:-1. In welding process of clad plate, particular cautions should be taken, because of transformations caused by rising of welding temperature and because of decreases of corrosion resistance resulted by diffusion of alloy elements. Therefore, the following methods must be taken:-a) In welding of the stainless-clad side, it was necessary to use direct current and the strength of current should be as lower as possible.b) It was recessary to use stainlees welding rod which contained higher alloy element than clad stainless steel.c) It was necessary to contemplate further, considering to put the welding methods in good order.d) If any transtormation could not be permitted, both side stainless clad might be used.2. In gas cutting process of clad plate, the authors cut easily by using larger size cutting torch and higher oxygen pressure than in the case of plain carbon steel plate which had same thickness, and inclining torch about 15 degree forward. When the clad thickness increased over about 30% in total plate thickness, gas cutting of these plate became very difficult.3. From the result of corrosion test on 18-8 stainless steel, it was supposed that non-metallic inclusion in stainless steel remarKably affects on corrosion resistant property.4. At the design of stainless-clad steel construction, attension to avoid sharp bend of clad plate must be taken, in order to detain stress corrosion of 18-8 stainless as little as possible.