A stainless steel capillary pipe, also known as a capillary tube or needle tube, is a small-diameter, thin-walled, and precision-engineered tube made from stainless steel. These tubes are characterized by their very small internal diameters and precise outer dimensions, making them suitable for a wide range of specialized applications.
WUXI KONGZO STEEL is a leading stainless steel coil supplier, offering the best price and service. We can process orders to any specification, length, and thickness, and then do quality inspection and packaging.
| Type | Stainless Steel Capillary Pipe |
| Grade | 304, 304L, 316, 316L |
| Standard | ASTM A269/A249 /EN10217-7 |
| Material | 304, 304L, 316, 316L |
| Outside Diameter | 4.0mm - 10mm |
| O.D. Tolerance | According to ASTM A269/A249 standard |
| Thickness / Tolerance | 0.08mm - 1mm, +/-10% |
| Process Method | A249: Code drawn, Bright annealing, Inside bead removing |
| A269: Code drawn, Bright annealing | |
| Finishing | Bright annealing |
| Satin / Sanded / Brushed / Hairline HL: 180 grit, 240 grit, 320 grit | |
| Bright: 400 grit, 600 grit, Mirror: 800 grit / 8K | |
| MOQ | 1 ton , We can accept sample order. |
| Delivery port: | Shanghai, Tianjin, Qingdao, Ningbo, Guangzhou, etc. |
| Packaging Detail | Standard export packaging, various transportation, according to customer needs |
| AISI | Chemical Composition & Mechanical Property | |||||||||||
| C | Si | Mn | Cr | Ni | S | P | Ts（N/mm ²） | Ys（N/mm ²） | El | HB | HRB | |
| 201 | ≤0.15 | ≤0.75 | 5.5-5.7 | 16-18 | 3.5-5.5 | ≤0.03 | ≤0.060 | ≥520 | ≥275 | ≥40% | ≤241 | ≤100 |
| 202 | ≤0.15 | ≤1 | 7.5-10 | 17-19 | 4-6 | ≤0.03 | ≤0.060 | ≥520 | ≥275 | ≥40% | ≤207 | ≤95 |
| 304 | ≤0.08 | ≤1.0 | ≤2.0 | 18-20 | 8-10 | ≤0.03 | ≤0.045 | ≥520 | ≥205 | ≥40 | ≤187 | ≤90 |
| 304L | ≤0.03 | ≤1.0 | ≤2.0 | 18-20 | 9-13 | ≤0.03 | ≤0.045 | ≥480 | ≥175 | ≥40 | ≤187 | ≤90 |
| 316 | ≤0.08 | ≤1.0 | ≤2.0 | 16-18 | 10-14 | ≤0.03 | ≤0.045 | ≥520 | ≥205 | ≥40 | ≤187 | ≤90 |
| 316L | ≤0.03 | ≤1.0 | ≤2.0 | 16-18 | 12-15 | ≤0.03 | ≤0.045 | ≥480 | ≥175 | ≥40 | ≤187 | ≤90 |
| 410 | ≤0.15 | ≤1.0 | ≤1.0 | 11.5-13.5 | ≤0.03 | ≤0.040 | ≥440 | ≥205 | ≥20 | ≤201 | ≤93 | |
| 430 | ≤0.12 | ≤0.75 | ≤1 | 16-18 | ≤0.60 | ≤0.03 | ≤0.040 | ≥450 | ≥205 | ≥22 | ≤183 | ≤88 |
Stainless steel capillary pipes are used in a variety of specialized applications that require precision and control over fluid or gas flow. Some common applications include:
1)Analytical Instruments: Capillary tubes are often used in analytical chemistry and laboratory instruments, including chromatography, spectrophotometry, and other analytical techniques.
2)Medical Devices: They find use in medical devices and equipment, such as catheters, endoscopes, and diagnostic instruments, due to their precise dimensions and biocompatibility.
3)Heat Exchangers: Capillary pipes are employed in heat exchangers and heat transfer systems, especially in microscale heat exchangers used in cooling and refrigeration.
The manufacturing process of stainless steel and alloys involves multiple steps to transform raw materials into flat, rectangular sheets or plates made of stainless steel and alloys. Here are a few key steps for stainless steel and alloys:
Molten stainless steel and alloys are cast into large ingots or billets through a casting process.
During the hot rolling process, the thickness of the steel ingot is gradually reduced and elongated to form long strips or coils.
Annealing involves heating stainless steel and alloys to a specific temperature and then slowly cooling it.
Cold rolling is carried out through rolling mills to reduce thickness to meet customer specifications.
Wuxi Walmay Metal Co, Ltd is a comprehensive processing group of Alloy Steel、Forged Parts Fitting、Titanium Alloy、Stainless Steel、Special Welding Wireseries， and more than 800 specifications.
Our group has been engaged in the domestic and global market for more than ten years with rich steel experience and can offer professional advice for customers inapplications with different materials.
Machine cutting
Sheet cutting
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Dynamic waterjet cutting
sawing
Plank leveling
polishing
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laser cutting
production cutting
Long product cutting
Bar and structural cutting
polishing
Heat treatment and annealing: Wuxi Walmay Metal can heat treat certain 400 series stainless steels.
Material Reliability Identification (PMI): Wuxi Walmay Metal can complete this testing in-house.
Ut Testing: Ultrasonic testing (UT) uses high-frequency sound energy to inspect and measure stainless steel products.
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