5 results about "Austenite" patented technology

The invention relates to a control method of inclusions in a thick steel plate used for high heat input welding, which is characterized by adding a deoxidizing agent during steel liquid pouring, wherein the components and adding order of the deoxidizing agent are as follows: Mn and Si, Al, Ti, Ca and Mg; the Mg content is 0.0005-0.007%, when Mg is added for deoxidizing, the oxygen content in steel liquid needs to be adjusted and precisely controlled through adding Fe2O3 powder to a casting ingot mold, and the adding amount of the Fe2O3 powder is such that the oxygen content in the steel liquid is maintained at 0.001-0.008%; the Al content in steel is lower than 0.006%; the ratio of the inclusions with size smaller than 3mu m in the steel liquid is not lower than 80%, and the surface density of the inclusions is not smaller than 300 inclusions/mm<2>; the main components in the center of the inclusions are MgO or MgO and Ti2O3, and the main component on the external surface of the inclusions is MnS. The inclusions formed by using the method provided by the invention can favorably inhibit the growth of austenite crystal in a welding heat-affected zone and promote the growth of intracrystalline ferrite, thus improving the high heat input welding performance of the thick plate.

The invention provides a welding wire material for austenitic stainless steel. The welding wire material comprises the following chemical ingredients in percentage by weight: 0.011 to 0.078 percent of C, 0.15 to 0.32 percent of Si, 1.57 to 2.39 percent of Mn, less than or equal to 0.023 percent of P, less than or equal to 0.013 percent of S, 25.59 to 25.82 percent of Cr, 8.17 to 8.87 percent of Ni, less than or equal to 0.43 percent of Mo, less than or equal to 0.058 percent of N, 0.09 to 0.39 percent of Cu, 0.03 to 0.042 percent of rare-earth element Re and the balance of Fe and inevitable impurities. Aiming at the austenitic stainless steel containing the rare-earth element and the austenitic stainless steel and ordinary steel, the invention provides the welding wire material for the austenitic stainless steel, which is scientific in design, convenient to use and high in deposition rate, the sensitivity of metal cold cracks at weld joints after welding is low, and the performance of metal at the weld joints is close to that of base metal.

The invention provides a critical solid solution and critical multiple cooling aging and annealing composite heat treatment method. The method comprises a critical solid solution heat treatment process and a critical multiple cooling aging and annealing composite heat treatment process. According to the scheme, the problems that existing austenitic stainless steel heat treatment is poor in quality stability, low in qualified rate, low in hardness, low in mechanical property, poor in consistency, poor in discoloration and corrosion resistance, long in heating time, low in efficiency, low in cost and the like can be solved. The heating reliability of heat treatment equipment is poor; the service life of a high-temperature component is short; the cost is high; and the like.

The invention relates to the technical field of GCr15 heat treatment processes, in particular to a GCr15 heat treatment process. The GCr15 heat treatment process is used for steel parts made of GCr15.The GCr15 heat treatment process comprises the following steps that 100, a steel part is heated to the austenite temperature through induction heating equipment to be subjected to quenching heating treatment; 200, quenching cooling treatment is carried out on the steel part subjected to the quenching heating treatment through induction cooling equipment; 300, tempering heating treatment is carried out on the steel part subjected to the quenching cooling treatment through the induction heating equipment; and 400, natural cooling is carried out on the steel part subjected to the tempering heating treatment. A single induction heating process and a single temperature control cooling process are adopted for the steel part, and multi-section quenching heating and tempering heating treatment are adopted in the treatment process, so that a produced steel part is small in hardness scatter difference, tiny in deformation and small in turning amount, and energy consumption is low while the efficiency is guaranteed.