我所于1975年5月在靶场进行日九四式75毫米山炮榴弹试验时,发现有钢质筒是1943年生产的,该药筒已存放三十二年,但只有较轻微的锈蚀.总后首长建议让有关单位组织进行鉴定.一、调查情况为了给鉴定工作提供一些资料,在鉴定前我们作了一些调查工作,情况如下.1、《日本兵器工业会会志》1955年第68、69期介绍了日本第二次世界大战期间的钢药筒的研制和生产情况.日本从1927年就开始研究以钢代铜工作,经过十几年的 When I carried out a 94-day 75 mm cannon grenade test at the shooting range in May 1975, I found that a steel tube was produced in 1943 and had been stored for 32 years but with only minor rust. After the head of the proposed organization for the relevant units identified I. First, the investigation In order to provide some information on the identification of work in the appraisal before we made some investigations, the situation is as follows.1, “Japan Ordnance Association” 1955 68th, No. 69 introduced the development and production of steel cartridges during the Second World War in Japan. Since 1927, Japan began to study the work of replacing copper with steel. After more than a decade