Patent ID: 11969368
Assignee: BIOTYX MEDICAL (SHENZHEN) CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC A  C  B | IPC A  B  C

Claim 15:
16. A lumen stent preform, characterized in that the lumen stent preform is pure iron or an iron alloy, a total impurity element content of the pure iron is less than or equal to 0.5 wt. %, a total alloy element content of the iron alloy is less than or equal to 3 wt. %, and the iron alloy contains no strong nitride-forming element, the lumen stent preform has a hardness of 160-250HV0.05/10, and has a microstructure that is a deformed structure having a grain size scale greater than or equal to 9 or a deformed structure after cold machining;
wherein the lumen stent preform is obtained by drawing a pure iron blank or an iron alloy blank, and the pure iron blank and the iron alloy blank are incompletely annealed structure or completely annealed structure;
wherein when the pure iron blank and the iron alloy blank are both incompletely annealed structure, the hardness of the pure iron blank is greater than 90HV0.05/10, the hardness of the iron alloy blank is greater than 110HV0.05/10, and the microstructures of the pure iron blank and the iron alloy blank are deformed structures; and
when both the pure iron blank and the iron alloy blank are completely annealed structure, the hardness of the pure iron blank is 90HV0.05/10, the hardness of the iron alloy blank is 100-150HV0.05/10, and the microstructures are both equiaxed grains with a grain size scale greater than or equal to 4.