Standard: ASTM, AISI, DIN, EN, GB, JIS
Technique: Hot Rolled/Cold Rolled/Galvnized
Processing Service: Welding, Punching, Cutting
Available Size Range: Click here
Get A QuoteStainless steel capillary tubes are widely used in various industries due to their excellent corrosion resistance and precise dimensional characteristics.
Chemical Composition:
Typically, they contain elements such as chromium (Cr), nickel (Ni), molybdenum (Mo), and iron (Fe). The specific proportions vary depending on the grade. For example, in 304 stainless steel, it usually contains about 18% Cr and 8% Ni, which provides good general corrosion resistance. 316 stainless steel has a higher molybdenum content (around 2 - 3%), enhancing its resistance to chloride-induced corrosion.
Mechanical Properties:
• Tensile strength: Different grades have different tensile strength ranges. Generally, 304 stainless steel capillary tubes have a tensile strength in the range of 515 - 760 MPa, while 316 can reach slightly higher values, depending on the manufacturing process and heat treatment.
• Elongation: It shows good elongation properties, allowing for some degree of deformation without fracturing. For instance, 304 stainless steel can have an elongation at break of around 40 - 60% under standard test conditions.
Standard Specifications in Different Countries:
| Country | Standard Specification |
| USA | ASTM A269 (covers general requirements for seamless and welded austenitic stainless steel tubing, applicable to capillary tubes in many cases) |
| Germany | DIN 17457 (specifies the dimensions, tolerances, and technical delivery conditions for stainless steel tubes, relevant for capillary applications) |
| China | GB/T 14976 (defines the technical requirements, test methods, and inspection rules for seamless stainless steel tubes, which capillary tubes need to comply with in certain aspects) |
Popular Grades:
• 304 Grade: It is one of the most commonly used grades. With its balanced combination of cost and performance, it is suitable for a wide range of applications where moderate corrosion resistance is required, such as in the food and beverage industry for fluid transfer.
• 316 Grade: Known for its enhanced corrosion resistance, especially in chloride-rich environments like seawater applications or in some chemical processing industries.
Popular Questions and Answers:
Q1: Why is 316 stainless steel more suitable for seawater applications than 304?
A: 316 stainless steel contains molybdenum, which gives it better resistance to chloride-induced corrosion compared to 304. Chlorides in seawater can cause pitting and crevice corrosion, and the added molybdenum in 316 helps prevent this, making it more reliable in such harsh environments.
Q2: What is the typical inner diameter range of stainless steel capillary tubes?
A: The inner diameter can range from as small as 0.1 mm to several millimeters. For very precise fluid handling or microfluidic applications, the inner diameter might be in the sub-millimeter range, while for some general industrial uses, it could be up to 5 - 10 mm.
Q3: How is the surface finish of stainless steel capillary tubes achieved?
A: It can be achieved through various methods. Mechanical polishing is commonly used to get a smooth surface, which not only improves the appearance but also reduces surface roughness for better fluid flow characteristics. Electro-polishing is another option, especially for applications where a very high level of cleanliness and smoothness is required, as it can remove micro-irregularities and improve corrosion resistance further.
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