Ferrite-free heavy caliber thick-wall heat resistant steel pipe material

Abstract

The invention relates to a ferrite-free heavy caliber thick-wall heat resistant steel pipe material which belongs to the technical field of steel tubes for supercritical thermal power generating units and comprises the following components in percent by weight: 0.090-0.12 percent of carbon, less than 0.3 percent of silicon, 0.40-0.6 percent of manganese, not more than 0.020 percent of phosphorus, not more than 0.010 percent of sulfur, 8.5-9.0 percent of chromium, 0.1-0.3 percent of nickel, 1.7-2.0 percent of tungsten, 0.3-0.5 percent of Mo, 0.04-0.07 percent of niobium, 0.15-0.22 percent of vanadium, 0.04-0.07 percent of nitrogen, 0.001-0.004 percent of boron, 0.01-0.03 percent of cobalt, 0.01-0.07 percent of copper, 0-0.01 percent of aluminum and the balance of iron. The invention has the advantages that: based on the P92 steel, through optimizing the component proportion and adding elements Co and Cu, a heavy caliber thick-wall heat resistant steel pipe is in a single martensite structure, has excellent property and meets the requirements on ASME CC2197-6.

Description

technical field [0001] The invention belongs to the technical field of steel pipes for supercritical thermal power units, and in particular provides a ferrite-free large-diameter thick-walled heat-resistant steel pipe material, the optimal chemical composition range of ferrite-free large-diameter thick-walled heat-resistant steel pipes, suitable for It is used in the manufacture of large-diameter thick-walled heat-resistant pipes for large-scale advanced ultra-supercritical thermal power units. Background technique [0002] The higher the steam parameters of thermal power units, the higher the power generation efficiency (see Table 1), thereby reducing resource and energy consumption and greatly reducing greenhouse gas emissions, ensuring national energy security. The key restrictive factor that limits the improvement of steam parameters of thermal power units is the development and application of heat-resistant steel pipes in the high temperature section. my country has ta...

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