High-strength seamless steel pipe strength and the use of long-term temperature

The matrix is a pearlite or bainite structure of low-alloy heat-resistant steel. Mainly chrome molybdenum and chrome molybdenum vanadium series, and later developed a variety (such as chromium, tungsten, molybdenum, vanadium, titanium, boron, etc.) composite alloy steel, steel lasting strength and the use of temperature gradually increased. But the general amount of alloying elements up to about 5%, the organization in addition to pearl in vitro, also includes bainitic steel. This kind of steel in 450 ~ 620 ℃ has good high temperature creep strength and process performance, and good thermal conductivity, expansion coefficient is small, the price is low, widely used in the production of 450 ~ 620 ℃ range of various heat-resistant structural materials. Such as power plant boiler steel pipe, turbine impeller, rotor, fasteners, oil refining and chemical use of high-pressure containers, waste heat boiler, heating furnace tube and heat exchanger tube.

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