The article according to claim 1 wherein the tube has an outer diameter no greater than about 0.05 inches.ġ8. The article according to claim 1 wherein the tube has an outer diameter no greater than about 0.25 inches.ġ7. The article according to claim 1 wherein the tube is a hypotube.ġ6. The article according to claim 1 wherein the tube has a relative magnetic susceptibility less than about 5×10 −3 emu/gG.ġ5. The article according to claim 1 wherein the tube comprises stainless steel selected from the group consisting of 302, 304, 304L, 304LV, 316, 316L, and 316LV.ġ4. The article according to claim 1 wherein the tube has no more than about 5% ferrite.ġ3.
The article according to claim 1 wherein the tube has at least about 98% austenite.ġ2. The article according to claim 1 wherein the tube has at least about 90% austenite.ġ1.
The article according to claim 1 wherein the tube has at least about 70% austenite.ġ0. The article according to claim 1 wherein the tube has a ratio of martensite:austenite of about 0.01 to about 0.25.ĩ. The article according to claim 1 wherein the tube has about 2% to about 3% martensite.Ĩ. The article according to claim 1 wherein the tube has about 1% to about 5% martensite.ħ. The article according to claim 1 wherein the tube exhibits a percent elongation at break of about 6% to about 12%.Ħ. The article according to claim 1 wherein the tube exhibits a percent elongation at break of about 5% to about 20%.ĥ. The article according to claim 1 wherein the tube has an ultimate tensile strength of about 125 to about 225 kilopounds per square inch.Ĥ.
The article according to claim 1 wherein the tube has a center-to-center bend distance of less than about 0.2 inches.ģ. An article comprising an austenitic stainless steel tube having less than about 10% martensite, wherein said tube, when bent according to the Kink Resistance Test, has a center-to-center bend distance of less than 0.3 inches.Ģ.
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