t91 tube 42X5_ Katherine source steel (certified) _ Qiqihar t91 provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) is specialized in "Q345b seamless steel pipe, 35crmo seamless steel pipe, 42crmo seamless" enterprise, the company of "honesty, hard service" concept, for you provide the highest quality products and services. Welcome to inquire! Contact: Manager Wu. T91 alloy tube is like a tree Ridge National Laboratory of the United States and the American Combustion Engineering Metallurgical Materials Laboratory cooperation in the development of the new martensitic steel. It is based on reducing the carbon content of steel 9Cr1MoV strictly limit the content of sulfur, phosphorus, and add a small amount of vanadium, niobium alloying elements. No. K90901 T91 T91 alloy tube alloy tube T91 alloy tube specifications: 8-1240 × 1-200mm T91 alloy tube Overview: T91 alloy tubes are boilers, heat exchangers heating and ferritic alloy steel seamless and Olympic (ASTM A213 / A213M-07a) uses: for low and medium pressure boiler (working pressure is generally not more than 5.88Mpa, operating temperature of the heating surface tubes below 450 ℃); a high-pressure boilers (above 9.8Mpa working pressure in general, the working temperature between 450 ℃ ~ 650 ℃) of heating surface tubes, economizer, superheater, reheater, petrochemical industrial pipe. T91 alloy tube heat: T91 final heat treatment for normalizing + tempering, normalizing temperature of 1040 ℃, holding time of less than 10 min, the tempering temperature is 730 ~ 780 ℃, holding time of less than 1h t91, final organization tempered martensite after heat treatment. T91 steel cold cracking tendency larger t91 where to sell, under certain conditions, prone to delayed cracking, it must be tempered welded joints within 24 h after welding. T91 weld tissue state of lath martensite, tempered martensite after tempering can be changed, and its performance is superior than the lath martensite. T91 low temperature tempering steel 51X3.5, tempering effect is not obvious, easy to aging and weld metal embrittlement; tempering temperature is too high (more than AC1 line), the joint may also austenitizing again, and in the subsequent The cooling process re-hardened. At the same time of Island t91, as described in the foregoing, the tempering temperature should also be considered to determine the impact of the joint softening layer. Generally, T91 tempering temperature is 730 ~ 780 ℃