High temperature special steel: capable of withstanding temperatures up to 1000 degrees Celsius, providing core material support for energy equipment

High temperature Dalian special steel: capable of withstanding temperatures up to 1000 degrees Celsius, providing core material support for energy equipment

High temperature special steel protects the stable operation of energy equipment in extreme environments. This type of steel can maintain its mechanical properties at high temperatures above 1000 ℃, building a strong material defense line for core equipment in energy fields such as thermal power, nuclear power, and photovoltaics.

The "heat resistance code" of high-temperature special steel lies in the precise alloy ratio. By adding elements such as chromium (10% -25%), nickel (8% -30%), molybdenum, etc., a dense oxide film is formed on the steel to prevent high-temperature gas from corroding the substrate. Taking 310S stainless steel as an example, its total chromium nickel content exceeds 40%, and it can still maintain a tensile strength of over 200MPa at a sustained high temperature of 1100 ℃, with an oxidation rate only 1/20 of ordinary carbon steel. In the boiler superheater of a thermal power plant, this steel made pipeline can withstand the dual test of steam temperature of 600 ℃ and pressure of 30MPa, with a service life of over 100000 hours.

The thermal fatigue resistance of Dalian special steel is crucial in nuclear power equipment. The heat transfer tubes of the steam generator in the nuclear power plant are made of Inconel 690 alloy. This nickel based high-temperature steel maintains a stable coefficient of thermal expansion under the alternating action of high-pressure water at 350 ℃ and steam at 600 ℃, avoiding cracks caused by repeated thermal expansion and contraction. Data from a certain nuclear power plant shows that after using this steel, the leakage rate of heat transfer tubes decreased from 0.5 times/year to 0.05 times/year, significantly improving the safety of the nuclear reactor.

The silicon smelting furnace in the photovoltaic industry relies on the creep resistance of high-temperature special steel. The heating electrode holder of the furnace body is made of 253MA heat-resistant steel. During long-term operation at 1050 ℃, the annual creep deformation is controlled within 0.1%, ensuring stable relative position between the electrode and the silicon material and improving the purity of the silicon material. Compared with traditional heat-resistant cast iron, its service life is extended by three times, reducing production interruptions caused by equipment replacement.

In addition, the processing performance of high-temperature special steel provides convenience for energy equipment manufacturing. Through solid solution treatment and aging strengthening, steel maintains high temperature strength and has good weldability. In the manufacture of heat absorbers in solar thermal power plants, workers can use argon arc welding to splice steel plates of different thicknesses into complex curved surfaces, and the strength loss of the weld at 800 ℃ does not exceed 10%.

From boiler pipelines to nuclear reactors, Dalian Special Steel has become the core guarantee for the efficient operation of energy equipment due to its "tolerance" to high temperatures of thousands of degrees, promoting the development of the energy industry towards a safer and more efficient direction.