... Hexin Machinery Co.,Ltd is one of the leading cast rotary retort manufacturers and suppliers China,Website:http://www. ... castingchinahx.com, welcome to buy customized cast rotary retort, spiral rotary furnace retorts, generator retorts, muffles ... retorts are used to heat treat a variety of small parts , like carbo nitriding ,carburizing, continuous hardening for ball bearings, ...