High-nitrogen austenitic stainless steel for vascular stent and application thereof
A nitrogen austenite and vascular stent technology, applied in the field of high nitrogen austenitic stainless steel, can solve the problems of poor austenite stability and poor visibility, and achieve the goal of increasing density, improving and optimizing elasticity, and good visibility Effect
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[0033] According to the chemical composition range set by the high-nitrogen stainless steel of the present invention, 5 furnaces of steel (respectively numbered 1-5) and 20 kg of comparative stainless steel were smelted in a pressurized induction furnace with 50 kg, and the specific chemical composition is shown in Table 1. The protective nitrogen pressure is 0.5MPa, 0.6MPa, 1MPa and 0.8MPa, 0.7MPa respectively, and the nitrided alloy is MnN with a nitrogen content of 6% (wt%). These 6 heats of steel are respectively poured into a φ100×350 steel ingot. , according to the following processing and heat treatment process specifications for processing.
[0034] The forging process is as follows: the alloy ingot is homogenized and heat-treated at 1150°C±15°C for 2 hours to open the billet, and is forged in three fires to form a rough billet, and the final forging temperature is 950°C.
[0035] The hot-rolling process is as follows: the first-rolled billet is kept at a temperature o...
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