... tools5)The body of the fittings,abtained by hot brass stamping,avoids the porosity that could result from the ... CW617N, CW602N, Hpb59-1, Hpb58-2, Hpb58-3, etc;brass body superficial treatment can be tin-plating and nickel-plating ... pipes together.Production process: cutting brass bar ino different sections according to diferent product-----heating these sections in intermediate frequency furnace ...