Advantages: 1, Tengfei cast steel production of end cover long service life, the use of standard wooden model, core surface brush special coating layer to prevent cracking, to ensure that the surface of the casting smooth and smooth; 2, the use of high-quality scrap raw materials and auxiliary materials, strict testing components before production; 3, melting before the furnace, after the furnace, the whole process of the as-cast sampling and the use of German spectrometer for testing, to ensure that the end cap composition qualified; 4, the use of special heat treatment process to increase the service life and deformation resistance of the end cover; 5, Tengfei cast steel production of stainless steel end cover can reach the international UT, MT inspection standards.