Heat treatment technology aartensite stainless steel annular forging
A martensitic stainless steel, annular forging technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of reducing hardness and tensile strength, increasing ferrite content, etc., to avoid cracking, save energy, avoid The effect of excessive temperature drop
Active Publication Date: 2015-04-29
CENT IRON & STEEL RES INST
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[0012] The present invention will be further described below with reference to a typical embodiment.
[0013] In this example, a 10-ton electric arc furnace was used for smelting, and 8 furnaces were smelted successively. After being refined in an LF furnace (ladle refining furnace), it was cast into a steel ingot, which was used as an electrode for electroslag remelting to form an electroslag ingot. The specific composition of the smelted 8-furnace martensitic stainless steel is shown in Table 1.
[0014] The poured steel ingot is first cut to the head and tail to remove the parts with more impurities at the tail and the part where the head and the horn are fused together, and then the surface is polished to clean the surface to avoid cracks during forging. The forging and blanking are carried out on a 4000-ton fast forging machine. The forging blanking temperature is 1170-1190 °C, and the final forging temperature is 870-1000 °C. In order to avoid cooling too fast during the...
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A martensite stainless steel annular forging and a heat treatment technology thereof belong to the technology field of manufacture of large forgings for nuclear power. A ring blank comprises following chemical components in percentage by weight: 0.01 to 0.12% of C, Si not larger than 0.8%, 0.20 to 1.40% of Mn, P not larger than 0.030%, S not larger than 0.030%, 10.0 to 16.0% of Cr, 4.0 to 7.0% of Ni, 0.2 to 1.1% of Mo, 0.10 to 0.30% of V, Co not larger than 0.08%, Cu not larger than 0.04%, and the rest of Fe. The technology comprises following steps: coating an asbestos blanket on the surface of the forged annular forging, controlling the cooling speed of 5 to 30 DEG per minute, putting the annular forging into an annealing furnace while maintaining the annular forging in a red hot state, keeping the furnace temperature in a range of 690 to 710 DEG C, maintaining the temperature of the annular forging for 20 to 22 hours in the furnace, cooling the furnace temperature at a speed of 20 to 30 DEG C per hour, while annular forging cools with the furnace, taking out the annular forging when the temperature of the furnace cools to 590 to 610 DEG C, coating a asbestos blanket on the annular forging, keeping the cooling speed at 5 to 15 DEG C per hour until the temperature of the annular forging cools to the room temperature. The heat treatment technology has the advantages of saving energy, reducing production cost, avoiding cracks of annular forgings, and improving the qualified rate of products.
Description
technical field [0001] The invention belongs to the technical field of manufacturing large forgings for nuclear power, in particular to a martensitic stainless steel ring forging and a heat treatment process thereof, which overcomes cracking of the martensitic stainless steel ring blank forging and is suitable for the fields of energy, metallurgy, machinery, chemical industry and the like. Background technique [0002] At present, the world's energy mainly relies on fossil energy, such as coal, oil, etc., but with the continuous increase in consumption, the reserves of fossil energy continue to decrease, forcing people to look for a clean, environmentally friendly and efficient energy. Nuclear energy has become the most promising energy source that can meet the above conditions. There are various types of nuclear reactors. According to energy, thermal neutrons and fast neutrons cause fission to cause thermal reactors and fast reactors; according to coolants, there are light ...
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IPC IPC(8): C22C38/52C22C38/46C21D9/40C21D1/30C21D8/06
Inventor 王立民刘正东杨钢包汉生赵吉庆何西扣
Owner CENT IRON & STEEL RES INST