美“陆军武器研究与发展中心”所属“大口径武器试验室”对炮管内膛表层进行了定性分析研究。带有白层的试样是取自于经射击后的不带任何衬层和未经镀铬的炮管内膛表面。经金相分析检查后,确认其中有多种不同白层的存在。对这些白层的化学和组 The “Large-caliber Weapons Laboratory” owned by the “Army Weaponry Research and Development Center” conducted a qualitative analysis on the surface of the barrel bore. Samples with white layers were taken from the shot bore barrel surface without any lining and without chrome plating. Metallographic analysis after checking to confirm the presence of a variety of different white layer. The chemistry and grouping of these white layers