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TP317 / S31700 Special Alloys Capillary 0.25 - 8.0mm OD For Horological Industry

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TP317 / S31700 Special Alloys Capillary 0.25 - 8.0mm OD For Horological Industry

Brand Name : CMMC

Model Number : As per specification and drawing

Certification : ISO 13485, ISO 9001 etc.

Place of Origin : CMMC in CHINA

MOQ : Negotiable

Price : Negotiable

Payment Terms : D/P, L/C, T/T

Supply Ability : 20 metric tons per month

Delivery Time : 60-90 days

Packaging Details : Water prevent, seaworthy transport, plastic box

Material : TP317, S31700

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TP317, S31700 capillary for medical tube, electronic microtube, optical fiber accessories etc


TP317, S31700 welded or seamless capillary.


(1)Medical tubes such as syringes for injections, puncture syringes.

(2)All kinds of industrial tubes, small precision stainless steel tubes, dispensing syringes.

(3)Temperature guide tube, electronic thermometer, thermocouple protection tube, barbecue temperature probe tube, instrument protection tube, sensor tube, barbecue rub tube, thermostat tube, instrument tube, thermometer stainless steel tube, microbiological engineering tube.

(4) Core protector, pen holder

(5) Various electronic microtubes, optical fiber accessories, optical mixer

(6) Horological industry, T-bars with studs or screws, watch belt fittings, gem punches needle

(7) All kinds of antenna tubes, automobile tail antenna tubes, pull rod antenna tubes, stretch rod, mobile phone stretch antenna tubes, miniature antenna tubes, all kinds of stainless steel antenna.

(8) Stainless steel tubes for laser engraving equipment

(9) Fishing tackle pipe, fishing rod pipe

(10) All kinds of food and beverage industry pipe, feeding pipe

(11) Various stylus tubes, cell phone stylus, computer stylus tubes


Table 1



The material shall conform to the requirements as to tensile properties specified in Table 2.

Table 2

Heat treatmentTensile strength σb MPaYield strength Rp0.2 %Elongation δ5 %Reduction of area min.%
Solid solution≥520≥205≥35≥50


The material shall be furnished in the solution heat treated condition. The heat-treatment procedure shall consist of heating the material to a minimum austenitizing temperature of 1900°F(1040°C), followed by quenching in water or rapidly cooling by other means. Alternatively, for seamless tubes, immediately following hot forming while the temperature of the tubes is not less than the specified minimum solution treatment temperature, tubes may be individually quenched in water or rapidly cooled by other means.


Tube blank → Peeling → Blanking → Heating → Hot piercing → Cooling → Finishing → Pickling → Lubricating

→ Cold rolling → Degrease → Heat treatment → Straightening → Tube cutting → Pickling → Inspection → Packing.


Tube blank → Peeling → Blanking → Inner hole drilling → Lubricating → Cold rolling or drawing → Degrease

→ Bright annealing → Straightening → ID and OD surface polishing → Inspection → Packing.


Permissible variations in dimensions

OD rangeODIDWT±%
Up to, but not including 3/32(0.094) in. (2.38 mm)+0.002
3/32 (0.094) in. (2.38 mm) but not including 3/16 (0.188)in. (4.76 mm)+0.003
3/16 to, but not including, 1/2(0.500) in. (12.70 mm)+0.004


A section of tube approximately 4 in.(101.6 mm) in length shall stand being flared with a tool having a 60°included angle until the tube at the mouth of the flare has been expanded to the following percentages without cracking or showing flaws:

Ratio of inside diameter to outside DiameterMinimum expansion of inside diameter, %

9 Hydrostatic, Air Underwater Pressure Test, or Nondestructive Electric Test

Each tube shall be subjected to the hydrostatic test, air underwater pressure test, or nondestructive electric test. The

type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

Hydrostatic Test

Each tube shall be subjected to a hydrostatic test at a test pressure not exceeding 1000 psi (6.89MPa).

Air Underwater Pressure Test

Each tube shall be subjected to an air underwater pressure test, at a test pressure as given by the following equation or 500 psi (3.4 MPa), whichever is less: P=2St/D


P = air pressure, psi or MPa

S = allowable fiber stress of 16,000 psi (110.3 MPa),

t = specified wall thickness, in. or mm, and

D = specified outside diameter, in. or mm.

Nondestructive Electric Test

Each tube shall be subjected to a nondestructive electric test that is capable of detecting imperfections with a

depth exceeding 10 % of the wall thickness or 0.002 in. (0.05mm), whichever is greater. Testing will not be required on sizes under 0.125 in. (3.18 mm) in outside diameter. However, at the option of the purchaser, tubing to be drawn to a diameter under 0.125 in. may be tested while in the range from 0.156 in. (3.97mm) to 0.125 in. outside diameter, and any defects that are found shall be culled out before any further reductions are made.


OD:0.25-8.0 mm

WT:0.065-3.0 mm

Concentricity: good


Surface:2B, BA, Mirror, sandblasted surface, passive surface.

Annealing surface,fine drawing bright surface Ra≤0.8μm,finely polished ID and OD Ra≤0.2-0.4μm. (possible Ra 0.1μm at request).


GB/T 3090 Stainless steel small diameter seamless steel tube

GBT 18457 Stainless steel needle for manufacturing medical machinery

GB 4234 Stainless steel for surgical implants

YBT 4513-2017 Welded stainless steel tubes for medical gases and vacuums

ASTM A632 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing (Small-Diameter) for General Service

ISO 5832-1-2016 Implants for surgery metallic materials - Part 1 Wrought stainless steel

ISO 9626-2016 Stainless steel needle tubing for the manufacture of medical devices requirements and test methods

SAE AMS 5643R Steel Corrosion Resistant Bar Wire Forging Tubing and Rings (S17400)


(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.

(4) High performance.


Minimum order quantityNegotiable
Packaging detailsWater prevent, seaworthy transport, plastic box
MarkAs per order
Delivery time60-90 days
Payment termsT/T, L/C at sight, D/P
Supply ability20 metric tons / Month

Product Tags:

seamless capillary


corrosion resistant stainless steel

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