焊接弯头理论重量表 标准:DD1403风道90°焊接弯头序号公称直径1234567891011121314151617181920212223200250300350400450500600700800900100011001200130014001800200022002400280032003600外径219273325377426480530630720820920102011201220132014201820202022202420282032203620弯曲半径250300350400450500550650750850950105011501250135014501850205022501450185032503650δ=36.49.613....