Austenitic stainless steel as-forged solid solution treatment process after forging
A technology of solid solution treatment for austenitic stainless steel, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of reducing the corrosion resistance of forgings, reducing the mechanical properties of forgings, poor solid solution effect, etc., to achieve processing The effect of short cycle, low energy consumption, and no growth of grain size
Inactive Publication Date: 2010-01-27
SHANGHAI HEAVY MACHINERY PLANT +1
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Problems solved by technology
The alloy carbide can be redissolved into the grain only at the solution temperature. If the holding time at the solution temperature stage is insufficient, the solid solution effect will be poor, which will reduce the corrosion resistance of the forging. If the solution temperature is too long, The grains will grow, which will reduce the mechanical properties of the forging
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[0011] The flow process of the solid solution treatment process after forging austenitic stainless steel black skin forgings of the present invention can be found in image 3 As shown, the forgings are firstly forged. In the forging process, the initial forging temperature is 1100 ° C ~ 1200 ° C, and the final forging temperature is greater than or equal to 850 ° C. The material is determined, the forging ratio of the forging is greater than or equal to 3, and the deformation of the forging in the last fire is greater than or equal to 20%; Figure 4 As shown, the furnace temperature during the final forging is greater than or equal to 900°C. After the final forging, the forging is not cooled to room temperature, but is immediately heated in the furnace. The temperature rise rate is greater than or equal to 80°C / h. Since the precipitation temperature of alloy carbide Cr23C6 is 400°C-850°C, the temperature of the forging is rapidly raised immediately after final forging, which c...
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The invention discloses a solution treatment technology of austenite stainless as-forged after forging. Initial forging temperature in the forging technology is 1100 DEG C to 1200 DEG C and final forging temperature is more than or equal to 850 DEG C, and forging ratio of forge pieces is more than or equal to 3. Deformation amount of the forge pieces at the final heating is more than or equal to 20 percent; after the forging technology, the forge pieces are immediately heated in a furnace and the temperature is increased to the solutionizing temperature of 1000 DEG C to 1100 DEG C as soon as possible and heat is preserved for 1 hour to 4 hours, and then the forge pieces are taken out of the furnace and put into a water tank at once for cooling to reach the room temperature. After the technology of the solution treatment is completed, the following steps of rough treatment, sampling and physical chemical testing are carried out. By adopting the solution treatment technology of austenite stainless as-forged after forging, the solution treatment immediately starts and the temperature rapidly increases. Furthermore, the technology of the invention has simple operation, low cost, short processing time and low energy consumption. When the solutionizing treatment is carried out on austenite stainless forge pieces with large section and tonnage, the size of crystalline grain does not increase.
Description
technical field [0001] The invention relates to a treatment process for forgings, in particular to a solid solution treatment process after forging for austenitic stainless steel black skin forgings with large cross-section and large tonnage. Background technique [0002] The traditional solution treatment process of austenitic stainless steel forgings is carried out after rough machining. Forgings with small cross-section and small tonnage have a short time in the solution temperature stage, and the tendency of grain growth is small, while forgings with large cross-section and large tonnage are in the solution temperature stage for a long time, and the tendency of grain size growth is large. The grains of the forgings of supertenitic stainless steel begin to grow after the solid solution temperature is 1050°C and above, and the temperature is kept for more than 4 hours. The flow of the existing solution treatment process for austenitic stainless steel forgings is as follow...
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IPC IPC(8): C21D8/00C21D11/00
Inventor 胡朝备谢培德赵瑞忠董屹许民包杭
Owner SHANGHAI HEAVY MACHINERY PLANT