Capillary stainless steel generally refers to a thin tube with an inner diameter of less than or equal to 1mm. Because such a tube diameter is as thin as a hair, it is called a capillary. Its use occasions include medicine, building materials, automatic instrument signal tubes, instrument wire protection tubes; precision optical ruler lines, industrial sensors, electronic equipment line protection tubes; electrical circuit safety protection, thermal instrument capillary protection, and hollow high-voltage optical cables internal support applications.
The commonly used material for capillary stainless steel tubes is
316 stainless steel. Due to the small diameter of this type of capillary, the flexibility, corrosion resistance, high-temperature resistance, wear resistance, tensile strength and waterproofness are very good. It also has excellent electromagnetic shielding performance and can be freely bent to various angles. And the radius of curvature can withstand the axial tension of more than 6 times the nominal inner diameter.
The corrosion resistance of
316 capillary stainless steel is better than that of 304 capillary stainless steel, and it always maintains excellent corrosion resistance in the production process of pulp and paper. And
316 stainless steel is also resistant to corrosion in marine and aggressive industrial atmospheres.
So is the heat resistance of
316 capillary stainless steel. In intermittent use below 871℃ and continuous use below 927℃,
316 capillary stainless steel tube has very good oxidation resistance. Do not use
316 stainless steel continuously when working in the range of 427°C to 857°C, but when
316 stainless steel is used continuously outside this temperature range, this type of stainless steel has very good heat resistance. However, the resistance to carbide precipitation of
316L stainless steel is better than that of
316 stainless steel, and it can continue to operate within the above temperature range.
In terms of heat treatment of
316 capillary stainless steel tubes, the material can be annealed in the temperature range of 1850-2050 ° C, then rapidly annealed, and rapidly cooled.
316 stainless steel cannot be hardened by heat treatment.
316 capillary stainless steel tube also has good welding performance. Can be welded using all standard welding processes. When welding, 316Cb, 316L, or 309Cb stainless steel filler rods or electrodes can be used for welding according to the application. To obtain the corrosion resistance, the welded section of
316 stainless steel should be annealed after welding. If
316L stainless steel is used, post-weld annealing is not required.
