Products Description
Product Specifications
| Standards |
ISO 9626:2016 |
| Steel Grades |
304 (S30400),304L (S30403),316 (S31600),316L (S31603) |
| Equivalent Standards |
ASTM A269,ASTM A967,GB/T 18457 |
| Outer Diameter (OD) | 0.3 mm – 3.0 mm |
| Wall Thickness (WT) | 0.05 mm – 0.5 mm |
| Length | 1m / 2m / 3m, or customized |
| Surface Treatment | Bright annealed |
| Production Process | Cold Drawn / Cold Rolled |
| Condition | Annealed, soft condition |
Medical and small diameter hypodermic tubing is manufactured using a multi-pass cold-drawing process, ensuring high dimensional precision. Outer diameter tolerances are controlled within ±0.01 mm, and the inner surface roughness is Ra ≤ 0.4 μm, guaranteeing smooth fluid delivery without residue.
The tubing is made from stainless steel grades such as 304 and 316; notably, the 316L grade offers effective resistance to pitting and intergranular corrosion caused by chlorine-based disinfectants, saline solutions, and repeated sterilization processes.
Customized Services
- TORICH supports material customization; in addition to common stainless steel grades like 304 and 316, we offer hypodermic tubing in specialized materials such as 321, 347, duplex stainless steel, and nickel-based alloys.
- We accommodate custom specifications with any outer diameter between 0.15mm and 6mm and any wall thickness between 0.04mm and 1mm.
- Various needle tip geometries are available-including single-bevel, double-bevel, and triple-bevel designs-with an angular precision of ±0.5°.
- We support end-forming processes such as flaring (bell-mouth or 60° internal cone), swaging, flanging, and curling.
- Electropolishing of both inner and outer surfaces is available, achieving a surface roughness of Ra ≤ 0.2 μm, making the tubing suitable for interventional medical devices requiring high levels of cleanliness.
Chemical Composition
| Steel Grade | C | Si | Mn | P | S | Cr | Ni | Mo | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 304 (UNS S30400) | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 18.00–20.00 | 8.00–10.50 | - | Balance |
| 316 (UNS S31600) | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 | Balance |
| 304L (UNS S30403) | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 18.00–20.00 | 8.00–12.00 | - | Balance |
| 316L (UNS S31603) | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 | Balance |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness | Density | Elastic Modulus |
|---|---|---|---|---|---|---|
| 304 | ≥ 515 MPa | ≥ 205 MPa | ≥ 40% | ≤ 92 HRB | 8.0 g/cm³ | 193 GPa |
| 316 | ≥ 515 MPa | ≥ 205 MPa | ≥ 40% | ≤ 95 HRB | 8.0 g/cm³ | 193 GPa |
| 304L | ≥ 485 MPa | ≥ 170 MPa | ≥ 40% | ≤ 92 HRB | 8.0 g/cm³ | 193 GPa |
| 316L | ≥ 485 MPa | ≥ 170 MPa | ≥ 40% | ≤ 95 HRB | 8.0 g/cm³ | 193 GPa |
Possible Alternative Grades
- For pre-filled syringes containing high concentrations of chloride ions or acidic buffers, duplex stainless steel 2205-which offers superior corrosion resistance compared to 316L-may be selected.
- Grade 316 stainless steel can be used as an alternative to 316L when higher corrosion resistance is required, but welding performance demands are less stringent; it is suitable for medical devices exposed to saline environments or aggressive cleaning conditions.
application areas
- Hypodermic needles
- Insulin pen needles
- Dental injection needles
- Safety needles
- Blood collection needles
- Medical injection systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: How should one choose between 304 and 316L?
A: Choose 304 for standard single-use injections and general medication delivery applications. If the product comes into contact with chlorine-based disinfectants or iodine preparations or involves welding processes, 316L is recommended.
Q: Which surface finish-BA or EP-is more suitable for hypodermic needles?
A: A: BA (Bright Annealed) surfaces feature a mirror-like finish with a roughness (Ra) of ≤ 0.4 μm; offering excellent cost-effectiveness, it is the preferred choice for general-purpose needle tubes. EP (Electropolished) surfaces achieve an Ra of ≤ 0.2 μm and offer enhanced corrosion resistance, making them ideal for high-end applications involving contact with medicinal fluids.
Q: How are the products packaged for delivery? Can you guarantee no deformation or contamination during transport?
A: Standard packaging involves encasing the tubes in PVC sleeves with dust caps at both ends, wrapping the bundle in bubble wrap, and placing it in a carton; long tubes are reinforced with wooden supports to prevent bending or deformation. High-cleanliness products are individually sealed in vacuum bags or clean protective sleeves.
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