TP347, S34700 capillary for medical tube, electronic microtube,
optical fiber accessories etc
TP347, S34700 welded or seamless capillary.
2 EQUIVALENT DESIGNATION
(1)Medical tubes such as syringes for injections, puncture
(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
(4) Core protector, pen holder
(5) Various electronic microtubes, optical fiber accessories,
(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
TP347 stainless steel is austenitic stainless and acid resistant
steel, characterized by good intercrystalline corrosion resistance,
in acid, alkali, salt and other solutions, have good corrosion
resistance. It is widely used in aviation, petrochemical, food,
paper and other industries, such as exhaust manifold and branch
pipe of aero engine, hot gas pipe of turbine compressor and parts
working under small load and temperature no more than 850°C.
5 CHEMICAL COMPOSITION (wt%):
6 PHYSICAL PROPERTIES
Melting range: 1398-1427℃
Specific electric resistivity:0.75 nN.m
Modulus of elasticity:
7 MECHANICAL PROPERTY
The material shall conform to the requirements as to tensile
properties specified in Table 3.
|Heat treatment||Tensile strength σb MPa||Yield strength Rp0.2 %||Elongation δ5 %||Reduction of area min.%||Hardness|
|Solid solution||≥520||≥205||≥35||≥50||≤192 HBW|
8 HEAT TREATMENT
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
A solution annealing temperature above 1950°F [1065°C] may impair
the resistance to intergranular corrosion after
subsequent exposure to sensitizing conditions in TP347.
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
|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
|3/16 to, but not including, 1/2(0.500) in. (12.70 mm)||+0.004|
11 FLARING TEST
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 Diameter||Minimum expansion of inside diameter, %|
12 Hydrostatic, Air Underwater Pressure Test, or Nondestructive
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.
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.
13 PRODUCT CAPACITY
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).
14 STANDARD SPECIFICATION
GB/T 3090 Stainless steel small diameter seamless steel tube
GBT 18457 Stainless steel needle for manufacturing medical
GB 4234 Stainless steel for surgical implants
YBT 4513-2017 Welded stainless steel tubes for medical gases and
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
15 COMPETITIVE ADVANTAGE
(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
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.
(4) High performance.
16 BUSINESS TERM
|Minimum order quantity||Negotiable|
|Packaging details||Water prevent, seaworthy transport, plastic box|
|Mark||As per order|
|Delivery time||60-90 days|
|Payment terms||T/T, L/C at sight, D/P|
|Supply ability||20 metric tons / Month|