Embrittlement brittle tempering temperature range based on precision tubes, can be divided into low and high temperature temper brittleness temper brittleness. After tempering brittleness precision tubes quenched martensite steel at a temperature range of 250 ~ 400 ℃ and tempered steel embrittlement, toughness of a brittle transition temperature significantly increased. Embrittlement has been 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 structural steel and low alloy high strength precision tubes. Precision has brittle fracture is intergranular tube or intergranular fracture and quasi-cleavage fracture mix. Cause tempering brittleness, generally considered: (1) the cementite during tempering to flake in the prior austenite grain boundaries, resulting in the 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 for tempering brittleness. Phosphorus-containing less than 0.005% high purity precision tubes do not produce tempering brittleness. Austenite grain boundary phosphorus occurs when the fire heated segregation, after quenching preserved. Phosphorus in the prior austenite grain boundary segregation and cementite during tempering in the original austenite grain boundaries, these two factors cause intergranular brittle fracture 40cr precision seamless tube, led tempering brittleness occurs. Precision Tube alloying elements have a greater impact on the tempering brittleness. Chromium and manganese promote segregation of impurity elements such as phosphorus in the austenite grain boundaries, thus contributing to tempering brittleness, tungsten and vanadium virtually no impact 15crmo precision seamless, molybdenum reduce toughness and tempering precision tubes of a brittle transition temperature but not enough to suppress the tempering brittleness. When the silicon can be postponed tempered cementite precipitation, temperature increase its generation, it can improve the precision tubes tempering temperature brittleness occurred. Shandong Liaocheng virtues of precision steel plant 16mn precision seamless, professional production of precision seamless steel tubes, precision tubes, precision steel, precision seamless steel pipe, large diameter precision seamless steel tubes, small-caliber precision steel. The company is known as "Jiangbei Water City" reputation of Liaocheng City Development Zone in Shandong Province, north of Qingdao - economic Museum along the highway, north-south Beijing-Kowloon Railway runs through the strategic location, convenient transportation and high credibility, low prices, precision fine, can produce a variety of non-standard precision tubes according to customer requirements. 40cr precision seamless virtue of Industry (certified), Zibo, Liaocheng by virtue of precision seamless tube industry Limited. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future.