High-heat strong performance martensitic stainless steel boriding and performance combined treatment process
A martensitic stainless steel and combined processing technology, which is applied in the field of boronizing treatment and performance heat treatment of martensitic stainless steel, can solve the problems of difficult boronizing strengthening of martensitic stainless steel blades with high thermal strength, etc. The effect of simplifying the processing process and maintaining the basic performance
Inactive Publication Date: 2008-09-17
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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Problems solved by technology
The mismatch of the above temperature ranges makes it difficult for this type of high thermal strength martensitic stainless steel blade to be strengthened by boronizing.
Method used
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Embodiment
[0028] During specific implementation, steps 2, 3, and 6 vary depending on the workpiece material and the boronizing depth and hardness requirements. Table 1 shows the experimental data of the embodiment of the improved boronizing and performance combined treatment process of martensitic stainless steel with high thermal strength for supercritical and ultra-supercritical steam turbines.
[0029] Table 1
[0030]
[0031] Table 2 is the boronizing layer detection and matrix material detection data of the embodiment.
[0032] Table 2
[0033]
[0034] After analyzing the detection data of the examples, it can be obtained that: after the boronizing process, the high heat strength martensitic stainless steel used for steam turbines has a boronizing depth of 0.10-0.13mm, and the hardness of the boronizing layer is HV 100g : 1400~1800, boronizing layer structure is FeB Fe 2 B compound. At the same time, the performance (hardness, strength, plasticity, structure, etc.) of t...
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The invention relates to processes of boriding treatment and property heat treatment to the improved martensitic stainless steel with intense heat and strong properties used for supercritical and ultra-supercritical steam turbines. A boriding and property combined treatment process to the martensitic stainless steel with intense heat and strong properties is carried out as follows: (1) a laminae is put in a container filled with solid particles of a boriding agent and is sent into a heat-treatment furnace for heating to 700 DEG C; (2) the furnace temperature is heated to 950-1050 DEG C at the speed of 100 DEG C per hour, and then is held for 5-12 hours; (3) the furnace temperature is heated to 1100-1170 DEG C, and then is held for 0.5-3 hours; (4) the cooling is carried out at the speed of 50-100 DEG C per hour till the temperature is below 400 DEG C for discharging; (5) the air cooling is carried out for cooling to the room temperature; (6) the processed workpiece is sent into the furnace for heating to 650-750 DEG C and then is held for 2-6 hours within 8 hours after the cooling to the room temperature in boriding treatment; and (7) the air cooling is carried out for cooling to the room temperature.
Description
technical field [0001] The invention relates to the boriding treatment and performance heat treatment process of the improved martensitic stainless steel with high heat strength performance for supercritical and ultra-supercritical steam turbines. Background technique [0002] With the development of large-scale supercritical and ultra-supercritical power generation technology, the martensitic stainless steel used for various high-temperature blades of steam turbines has become a new type of high-temperature stainless steel by adding W, Mo, V, Co, Nb, N, B and other elements. High-performance martensitic stainless steel, such as 2Cr11NiMoNbVN, 1Cr10NiMoW2VNb and other martensitic stainless steel with a working temperature above 580°C, and martensitic stainless steel with 3% Co at a working temperature above 600°C, such as MTB10A, 1Cr10Co3B, etc. However, due to the addition of these alloy elements, the heat treatment temperature of the material performance is also greatly im...
Claims
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Inventor 龙荷荪夏健宋帆王屹峰
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD