为了总结与交流球墨铸铁的生产经验,特别是利用地方铁、劣质焦生产球墨铸铁的经验,山东省机械工业局于一九七五年三月五日至三月八日在禹城县召开了全省球墨铸铁经验交流座谈会。省内、外62个单位,共102名代表参加会议,全国球铁国家标准起草会议的9位代表也应邀参加了会议。 In order to summarize and exchange experience in the production of nodular cast iron, especially the experience of using local iron and inferior coke to produce ductile iron, Shandong Machinery Industry Bureau was held in Rucheng County from March 5th to March 8th, 1975. The province’s nodular cast iron experience exchange seminar. A total of 102 representatives from 62 units within and outside the province attended the meeting. Nine delegates from the national drafting conference for national standards for cast iron were also invited to attend the meeting.