National standard national standard precision steel; GB / T699-2008, the national standard precision steel; GB / T3639-2008, in addition may also apply GB / T8162-2008 structural precision steel tubes. Precision steel European standard is: DIN2391 basic purpose of precision steel tubes are widely used in automobiles, motorcycles, electric cars, petrochemical, power, ship, aerospace, bearings, pneumatic components, the low-pressure boiler seamless steel tubes and other areas, is also applicable to steel sleeve cylinder, bearings, hydraulic, mechanical processing and other fields! Pipe Co., Ltd. Liaocheng Goldman manufacturing seamless, precision steel, special steel pipe. Phosphorus occurs when the fire heated austenite grain boundary segregation 101 precision steel, after quenching preserved. Phosphorus in austenite grain boundary segregation and cementite during tempering austenite grain boundaries in the original 22 precision steel tubes, these two factors intergranular brittle fracture, contributed to tempering brittleness occurs. Precision Tube alloying elements have a greater impact on the tempering brittleness. Pipe Co., Ltd. Liaocheng Goldman manufacturing seamless precision steel tubes, precision steel super precision steel, special steel pipe. Phosphorus austenite grain boundary segregation at the time of the fire heating after quenching preserved. Phosphorus in austenite grain boundary segregation and cementite during tempering in the original austenite grain boundaries, these two factors cause intergranular brittle fracture, contributed to tempering brittleness occurs. Precision Tube alloying elements have a greater impact on the tempering brittleness. Precision steel ll268, Goldman pipe for (certified), precision steel tubes supplied by Liaocheng Steel Pipe Co., Goldman Sachs. Liaocheng Steel Pipe Co., Goldman Sachs (www.gg986.com) (www.16mn986.com) Shandong Liaocheng, steel leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. Goldman Sachs steel for leadership with the staff warmly welcome all inquiries negotiations to create Goldman pipe for a better future.