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我们在日常检验过程中,发现YB676—73航空厚壁管标准中30CrMnSiA、30CrMnSiNi_2A、38CrMoAlA、45A等优质航空厚壁无缝管的低倍酸蚀试片上,在靠近钢管的外壁处有一块黑色的孔洞。这种孔洞是酸蚀后残留下来的,不使用10倍以下的放大镜观察都可以清楚看见。从孔洞的外观形态上看,有的呈闭合状,有的呈开放状。闭合状的孔洞边缘不与钢管外壁相通,边缘的首尾相接。开放
During the daily inspection, we found that the outer wall of the steel pipe is covered with a black (yellow) plate on the low acidity test specimen of 30CrMnSiA, 30CrMnSiNi_2A, 38CrMoAlA, 45A and other high quality aviation thick-walled seamless pipes in YB676-73 standard. Hole. This hole is left after acid etching, do not use 10 times the following magnifying glass can clearly see the observation. From the appearance of the appearance of the hole, some were closed, and some were open. Closure of the hole edge is not connected with the outer wall of the pipe, the edge of the first phase. open