AISI 304L Stainless Steel Capillary Tube

What is AISI 304L stainless steel capillary tubing?

AISI 304L stainless steel capillary tubing (UNS S30403, EN 1.4306) is an ultra-precision thin-walled austenitic stainless steel tube with a low carbon content of ≤0.035% (standard 304 stainless steel has a carbon content of ≤0.08%). Its mechanical properties include a minimum yield strength of 170 MPa, tensile strength of 485–655 MPa, and elongation of ≥40%. It also exhibits excellent corrosion resistance in mild chemical environments, making it ideal for applications requiring precise sealing and resistance to intergranular corrosion, such as medical devices, instrumentation, fluid sampling systems, aerospace hydraulic lines, and semiconductor processing equipment.

 

Our SS 304L capillary tubing is specifically designed for applications requiring tight dimensional tolerances, enhanced intergranular corrosion resistance after welding, and high purity. It is manufactured using cold drawing or micro-extrusion processes and conforms to ASTM A269/A632/ASME SA269 standards. Outer diameters (OD) range from 0.3–12.7 mm, wall thicknesses (WT) from 0.1–1.65 mm (with a precision tolerance of ±0.01 mm), and standard lengths are 1–6 m. Surface finishes include bright annealed (BA, Ra ≤0.8 μm) or electropolished (EP, Ra ≤0.25 μm).

304L Stainless Steel Capillary Tube Specification

Stainless Steel Capillary Tube Size Range	0.35mm to 6.35mm OD in thickness ranging from 0.1mm to 1.2mm.
Stainless Steel Capillary Tube Suppliers Thickness	1mm to 20mm, SCH 5/5S, 10/10S, 20/20S, 40/40S, 80/80S, 120/120S, 160/160S as per ANSI B36.19/36.10
Stainless Steel Capillary Tube Wall Thickness	0.08 – 0.2 mm
Stainless Steel Capillary Tube Outside Diameter	0.3 –12.0 mm
Stainless Steel Capillary Tube Material	SS 304, SS 304L, SS 316, SS 316L
Stainless Steel Capillary Tube Finish	Pickled, Polished, Bright Annealed, Electrolytic Polished
Stainless Steel Capillary Tube Form	Round, Strait, Hydraulic etc.
Stainless Steel Capillary Tube Type	As Welded, EFW, ERW, Seamless, Semi Seamless, Bead Removed
Stainless Steel Capillary Tube Mill Test Certificate	EN10204 3.1

 

TP304L Stainless Steel Capillary Tube Chemical Composition

STAINLESS STEEL CAPILLARY TUBE GRADES

UNS

C

Mn

P

S

Si

Cr

Ni

Mo

Ti

Nb

N

TP304L

S30403

0.035

2

0.045

0.03

1

18.0-20.0

8.0-13.0

 

TP304L Stainless Steel Capillary Tube Mechanical Properties

Material	Heat	Temperure	Tensile Strength	Yield Strength	Elongation %, Min
	Treatment	Min.	Ksi (MPa), Min.	Ksi (MPa), Min.
		º F(º C)
TP304	Solution	1900 (1040)	75(515)	30(205)	35
TP304L	Solution	1900 (1040)	70(485)	25(170)	35

 

Stainless Steel Capillary Tube Price List

304L stainless steel Capillary Tube FOB Price: US $1000-2100 / Ton

201 316 stainless steel Capillary tube FOB Price: US $1400-2500 / Ton

316l Stainless Steel Capillary Tube FOB Price: US $1200-2200 / Ton

316L Capillary Stainless Steel Tube FOB Price: US $1500-2200 / Ton

high quality seamless Capillary Tube 316 stainless steel FOB Price: US $1400-2200 / Metric Ton

304 stainless steel Capillary Tube FOB Price: US $1200-2200 / Ton

 

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Shipping methods include sea freight (full container load/less than container load, departure ports: Shanghai/Ningbo/Qingdao). The minimum order quantity is 50 kg or 100 meters. Delivery time for stock sizes (outer diameter 0.3-6mm, wall thickness 0.1-1.0mm) is 5-10 days, and for custom sizes, it is 15-20 days.

AISI 304L stainless steel capillary tubes (UNS S30403, EN 1.4306) are packaged with multi-layer precision packaging to protect their ultra-thin walls and strict dimensional tolerances: the inner layer uses food-grade PVC film for individual tube wrapping, supplemented with acid-free waterproof paper to prevent corrosion; the middle layer uses EPE foam for shock absorption; and the outer layer uses fumigated wooden crates or plywood pallets conforming to ISPM 15 standards (15-25 kg per crate), secured with steel straps, and the tube ends are sealed with plastic protective caps to prevent scratching.