Home / Standards / GB/T 4450-2008 GB/T 4450-2008 Active Marine blank steel flanges 船用盲板钢法兰 Standard Type GBT ICS 47.020.30 CCS U55 Status 现行 Issue Date 2008-02-14 Implementation 2008-09-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委