... , Q235, 16Mn, 20# etc.)ConnectionButt Weld & Socket Weld & ThreadPressure American Series: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900 ... , CLASS 1500, CLASS 2500European Series: PN 2.5, PN 6, PN 10, PN 16, PN ... Test Equipment Production Equipment asme b 16.47 carbon steel forged flange