Rhenium tungsten wire, method of manufacturing the wire and medical needle using the wire
The present invention provides a rhenium tungsten wire comprising 10 to 30 mass % of rhenium and balance of tungsten, and having a wire diameter D of 0.10-0.40 mm, wherein a tensile strength T (N/mm 2 ) of the rhenium tungsten wire exists within a range specified by an equation (1). 6314.6 ×D 2 −7869.3 ×D +4516.3 ≦T ≦5047.4 ×D 2 −7206.4 ×D +5129.2 (1). In a case where the medical needle is manufactured from the above rhenium tungsten wire, crack and breakage hardly occur at a time of performing a pressing work or a bending work, so that a production yield and durability of the resultant products can be greatly improved.
1. A rhenium tungsten wire, comprising:
tungsten; and
10-30 mass % of rhenium,
having a wire diameter D of 0.10-0.40 mm,
wherein a crystal grain size of the rhenium tungsten wire is 10 to 50 μm and a tensile strength T (N/mm 2 ) of the rhenium tungsten wire is within a range specified by equation (1)
6314.6 ×D 2 −7869.3 ×D+ 4516.3 ≦T≦ 5047.4 ×D 2 −7206.4 ×D+ 5129.2 (1).
2. The wire of claim 1 , wherein a total content of Fe, Mo, Si, Mg, Al, and Ca is 200 ppm or less.
3. The wire of claim 2 , comprising 24 to 27 mass % of rhenium.
4. The wire of claim 1 , comprising 24 to 27 mass % of rhenium.
5. The wire of claim 1 , in the form of a member comprised in a medical needle.
6. The wire of claim 2 , in the form of a member comprised in a medical needle.
7. The wire of claim 1 , wherein the tensile strength T (N/mm 2 ) of the rhenium tungsten wire is within a range specified by the following equation:
6314.6 ×D 2 −7869.3 ×D+ 4516.3 ≦T≦ 5047.4 ×D 2 −7206.4 ×D+ 5129.2.
8. A rhenium tungsten wire, consisting essentially of:
tungsten; and
10-30 mass % of rhenium,
having a wire diameter D of 0.10-0.40 mm,
wherein a crystal grain size of the rhenium tungsten wire is 10 to 50 μm and a tensile strength T (N/mm 2 ) of the rhenium tungsten wire is within a range specified by equation (1)
6314.6 ×D 2 −7869.3 ×D+ 4516.3 ≦T≦ 5047.4 ×D 2 −7206.4 ×D+ 5129.2 (1).
9. The wire of claim 8 , wherein a total content of Fe, Mo, Si, Mg, Al, and Ca is 200 ppm or less.
10. The wire of claim 9 , comprising 24 to 27 mass % of rhenium.
11. The wire of claim 8 , in the form of a member comprised in a medical needle.
12. The wire of claim 8 , comprising 24 to 27 mass % of rhenium.
13. The wire of claim 8 ,wherein the tensile strength T (N/mm 2 )of the rhenium tungsten wire is within a range specified by the following equation:
6314.6 ×D 2 −7869.3 ×D+ 4516.3 ≦T≦ 5047.4 ×D 2 −7206.4 ×D+ 5129.2 (1).