Liaocheng Goldman Seamless Steel Tube Manufacturing Co., Ltd., # 20 precision steel tubes, precision steel, special steel pipe. Precision tubes already brittle intergranular fracture is intergranular fracture or quasi-cleavage and mixed fracture. Cause tempering brittleness, small precision steel tubes, generally considered: (1) the cementite during tempering a sheet-like in the original austenite grain boundaries, precision steel tubes, causing grain boundary embrittlement are closely related. (2) impurity elements such as phosphorus in the prior austenite grain boundary segregation is also one of the reasons tempering brittleness. Phosphorus less than 0.005% high purity precision tubes not produce tempering brittleness. Pipe Co., Ltd. Liaocheng Goldman manufacturing seamless, precision steel tubes, 20 precision steel, shaped steel and the like. After tempering brittleness precision tubes quenched martensite steel at a temperature range of 250 ~ 400 ℃ tempered steel embrittlement, the toughness of a brittle transition temperature increased significantly. Already embrittlement precision tubes can not be reused tempering heating method to eliminate, it is also known% 26ldquo; irreversible temper brittleness% 26rdquo ;. It occurs mainly in steel alloy steel and high strength low alloy precision tubes. 12cr1mov precision steel tubes, steel pipe for Goldman Sachs (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.