Method for producing ageing steel of martensite without cobalt in high tensile and high toughness
A maraging steel, high-strength and high-toughness technology, applied in the field of cobalt-free high-strength and high-toughness maraging steel processing, can solve the problem of high heat treatment cost, cumbersome production process of cobalt-free maraging steel, long production cycle, etc. question
Inactive Publication Date: 2005-06-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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However, in actual production, the inventors of the present invention found that the production process of cobalt-free maraging steel is relatively cumbersome, the production cycle is long, and the cost of heat treatment is relatively high
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[0018] Three kinds of 18 (Ni) series cobalt-free maraging steel, each 10kg charge, the chemical composition after double vacuum smelting is shown in Table 2. After being forged at 1150°C and finally forged at 850°C to form a Φ18mm bar, it was air-cooled to room temperature and machined into a mechanical performance sample, then aged at 510°C for 2.5 hours, and then air-cooled to room temperature. Its mechanical properties are compared with those under the original processing technology as shown in Table 3.
[0019] Table 2:
[0020]
[0021] table 3:
[0022]
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A machining technology for the aged 18(Ni)-series non-Co martensite steel with high strength and toughness includes hot working, cold working by direct cold rolling or machining without solution treatment, ageing at 400-600 deg.C for 0.5-3 hrs, and air or water cooling. Its advantages are short period and simplified heat treatment.
Description
Technical field: [0001] The invention relates to a new processing technology of 18 (Ni) series high-strength and high-toughness maraging steels, which is specifically applied in the production process of T250 and T300 series cobalt-free maraging steels. technical background: [0002] Maraging steel is used in many fields due to its excellent high strength, high toughness and good processing performance. The currently widely used maraging steel is 18 (Ni) cobalt-free maraging steel with nickel, molybdenum, titanium, etc. Composition and properties of 18Ni type T series cobalt-free maraging steel). It can be seen from Table 1 that cobalt-free maraging steel has high strength and toughness, and does not contain precious metal cobalt, which greatly saves production costs and overcomes the difficulty of lack of cobalt resources in my country. However, in actual production, the inventors of the present invention found that the production process of cobalt-free maraging steel is ...
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Inventor 刘凯单以银何毅杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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