Features

ASTM A632 Seamless and Welded Stainless Steel Capillary Tube

Chemical Composition (wt.%)

Element	TP 304	TP 304L	TP 310	TP 316	TP 316L	TP 317	TP 321	TP 347	TP 348
Carbon	0.08	0.03	0.25	0.08	0.03	0.08	0.08	0.08	0.08
Manganese	2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00
Phosphorus	0.045	0.045	0.045	0.045	0.045	0.045	0.045	0.045	0.045
Sulfur	0.030	0.030	0.030	0.030	0.030	0.030	0.030	0.030	0.030
Silicon	1.00	1.00	1.50	1.00	1.00	1.00	1.00	1.00	1.00
Nickel	8-11	8-12	19-22	10-14	10-14	11-15	9-12	9-13	9-13
Chromium	18-20	18-20	24-26	16-18	16-18	18-20	17-19	17-19	17-19
Molybdenum	–	–	–	2-3	2-3	3-4	–	–	–
Titanium	–	–	–	–	–	–	0.5-0.7	–	–
Niobium	–	–	–	–	–	–	–	0.8-1.1	–

Mechanical Properties

Property	Requirement
Tensile Strength (ksi)	75 (515 MPa)
Yield Strength (ksi)	30 (205 MPa)
Elongation in 2 in. (%)	35
Elongation in small sizes (%)	25

Permissible Variations in Dimensions

Outside Diameter Range (inches)	Outside Diameter (+/-) (inches)	Inside Diameter (+/-) (inches)	Wall Thickness (+/-) (%)
Up to 0.094 (2.38 mm)	+0.002 / -0.000	+0.000 / -0.002	10
0.094 to 0.188 (2.38 mm – 4.76 mm)	+0.003 / -0.000	+0.000 / -0.003	10
0.188 to 0.500 (4.76 mm – 12.70 mm)	+0.004 / -0.000	+0.000 / -0.004	10

Technical Specifications

Specification	Value
Standard	ASTM A632/A632M Stainless Steel Capillary Tube
Grade	TP304/304L, TP310, TP316/316L, TP317, TP321, TP347, TP348
Manufacturing Process	Cold finished
Seam Type	Seamless and Welded
Dimension	Tube OD: 1.27-12.7mm Tube WT: 0.13-1.65mm
Length	100-6000mm
Delivery Condition	Heating the material and quenching in water or rapidly cooling by other means
Inspection Certificate	EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection)
Test	Chemical analysis, Tension tests, Flaring tests, Hydrostatic tests, Air underwater pressure tests, Nondestructive electric tests

Packing

The tubes are neatly arranged or bundled and placed in a cardboard box lined with PVC bags. The cardboard box is placed inside the wooden crate.

Application

Medical and Healthcare
Hypodermic Needles: These tubes manufacture medical needles for injections, biopsies, and other medical procedures.
Catheters and Cannulas: catheters and cannulas often use capillary tubes for precise fluid delivery or removal.
Endoscopy Equipment: They are used in endoscopic devices due to their corrosion resistance and small diameters.
Chemical and Petrochemical Industries
Fluid Transport: Capillary tubes precisely transport chemicals and gases in laboratory and industrial settings.
Instrumentation and Controls: These tubes serve as measuring devices, pressure gauges, and flow meters due to their resistance to corrosion and high-pressure conditions.
Automotive and Aerospace
Fuel Injection Systems: Capillary tubes are used in fuel injection systems to deliver precise amounts of fuel.
Hydraulic Systems: They are utilized in hydraulic systems requiring high-pressure resistance.
Electronics and Semiconductors
Sensor Fabrication: Capillary tubes make temperature, pressure, and flow sensors.
Electrical Connectors: They are used in connectors and other components due to their corrosion resistance.
Food and Beverage Industry
Food Processing: Stainless steel capillary tubes are used in equipment for food processing and beverage production due to their hygienic properties.
Dairy and Brewery Equipment: They are ideal for dairy and brewery equipment where corrosion resistance and cleanliness are critical.
Laboratory and Research
Chromatography: Capillary tubes are used in gas and liquid chromatography because they can safely transport small quantities of fluid.