35CRMO seamless (Seamless tube) is a hollow section, no seams around the long bar of steel. Currently steel t91, the total world production of seamless pipe manufacturing plant has more than 5100 t91 import 51X3.5 over 1850 companies in more than 110 countries, under which production of oil pipes under the more than 170 companies in 44 countries The more than 260 plants. In 2000, the national apparent consumption of seamless pipe 4.18 million tons, of which domestic supply of 3.821 million tons, accounting for 91.4% of total domestic demand. Imported 35.9 million tons, accounting for 8.59% of the total domestic demand. In the same year OCTG consumption of approximately 910,000 tons. Import about 252,000 tons. Inlet pipe account for about 70 percent of total domestic consumption, which imports accounted for 27.69% of total domestic pipe consumption, oil pipe imports accounted for about 70% of the amount of total imports of seamless pipe. When 35CrMo seamless steel pipe at the time of 500HB hardness below, its tensile strength and hardness is proportional t91, kg / mm2 (óB) = 1/3 X HB = 3.2 X HRC = 2.1 X HS, but the above relation is not In what situations are true, from the heat side, the tempering temperature is low, the relationship kg / mm2 and HRC can be destroyed when, 35CrMo seamless steel tempering temperature, hardness and tensile strength of the relationship between hardness with tempering temperature decreases, but in the state as well as quenching and tempering below 300 ℃, the relationship between hardness and tensile strength is difficult to set up. When the tempering temperature is about 300 ℃, kg / mm2 and a correlation between the HRC, namely high hardness, tensile strength is high; low hardness, tensile strength is low. In tempering state desires a kg / m㎡ value is difficult Tianjin t91 alloys because the tensile strength values ??are discrete distributions. Because kg / mm2 tempering 35CrMo unstable and can not be determined a seamless steel tube, so the Japanese Industrial Standard (JIS) in the tensile properties measured above 400 ℃ temperature tempering member also pass the test (also 300 ℃ tempered workpiece). In other words is reversed only quality pieces (+ 400 ℃ quenching and tempering) tensile test. Requirements in the industry just in the anti-rotating bending fatigue and abrasion resistance when using tempering pieces. Induction hardening and carburizing application examples that do this. 35CrMo seamless steel tensile stresses do not use low-temperature tempering. However, in low-carbon steel, but it can happen since M quenching and tempering (Ms point so high), there are users in the quenched state. Lath martensite structure of low carbon steel self-tempering, are used in industrial applications, but must now consider 35CrMo seamless steel hardenability and mass effect (if necessary add B, Cr, Mn and other metals ). Baosteel t91 alloy | t91 | Katherine source of steel provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Katherine source of innovative ideas will lead pipe and you work into the brilliant, for a better future!