High-strength stainless steel wire for interventional medical treatment and preparation method thereof

Abstract

The invention provides a high-strength stainless steel wire for interventional medical treatment. The high-strength stainless steel wire comprises the following chemical components in percentage by mass: 0.01%-0.09% of C, 0.01%-1.00% of Si, 0.01%-2.00% of Mn, 0.005%-0.05% of P, 0.01%-0.30% of S, 7%-15% of Ni, 14%-20% of Cr, 0.01%-0.08% of N, 0.01%-0.5% of La+Ce, 0.01%-1% of Y and the balance of Fe, wherein the equivalent weight of Ni is less than or equal to 35, and the equivalent weight of Ni is equal to Ni+0.65Cr+0.98Mo+1.05Mn+0.35Si+12.6 C. A preparation method of the stainless steel wire comprises the steps of vacuum melting, blank forging, wire rough blank drawing and wire drawing. Stainless steel is based on the chemical components, and a certain Ni equivalent is guaranteed. A certain martensite volume fraction is obtained by designing the pass compression amount, the drawing speed and the drawing temperature, so that the strength is regulated and controlled. A martensite structure with a certain crystal face orientation is obtained by combining a drawing die and the pass sectional area compression amount. In addition, through the grain refining effect of rare earth elements and the precipitation strengthening effect of in-situ authigenic rare earth nitride, the high-strength steel wire is finally obtained.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a high-strength stainless steel wire for interventional medicine and a preparation method thereof. Background technique [0002] With the advancement of medical technology and economic and social development, interventional operations are increasing day by day, such as coronary stent implantation, neurovascular stent implantation, peripheral vascular stent implantation, and cerebral artery coil implantation. In interventional surgery, a guide wire is needed to establish a channel, angiography, and transport support. A guide wire is generally composed of a core wire, an outer coating, and a head, of which the core wire is the most critical core raw material, which plays a supporting and guiding role. The guide wire that plays a supporting role is generally made of austenitic stainless steel, and the diameter is generally between 0.2mm-1.0mm. The requirements for concentricity and t...

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Problems solved by technology

However, although the addition of Cu has a strengthening effect, it will significantly affect the corrosion of stainless steel. The effect of this element has both positive and negative effects, so it should be used with caution

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