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TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance

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TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance

TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance
TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance

Large Image :  TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance

Product Details:
Place of Origin: CMMC in CHINA
Brand Name: CMMC
Certification: ISO 13485, ISO 9001 etc.
Model Number: As per specification and drawing
Payment & Shipping Terms:
Minimum Order Quantity: Negotiable
Price: Negotiable
Packaging Details: Water prevent, seaworthy transport, plastic box
Delivery Time: 60-90 days
Payment Terms: D/P, L/C, T/T
Supply Ability: 20 metric tons per month

TP321 Stainless Steel Special Alloys Capillary High Temperature Resistance

Material: 304S12, 321920, X10CrNiTi189, 0Cr18Ni10Ti
High Light:

seamless capillary


welded capillary

TP321, S32100, SUS321 capillary for medical tube, electronic microtube, optical fiber accessories etc



TP321, S32100, SUS321 welded or seamless capillary.



304S12, 321920, X10CrNiTi189, 0Cr18Ni10Ti



(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



TP321 stainless steel is Ni-Cr-Ti austenitic stainless steel, which has abrasion resistance, high temperature resistance and creep resistance, etc. Ti in TP321 stainless steel exists as a stabilizing element, but it is also a kind of heat resistant steel, which is much better than 316L in high temperature. TP321 stainless steel has good abrasion resistance in organic and inorganic acids with different concentrations and temperatures, especially in oxidizing media, so it is usually used for lining transportation pipeline of wear-resisting acid container and wear-resisting equipment. Its performance is very similar to that of 304, but it has better grain boundary corrosion resistance and high temperature strength due to the addition of titanium, which effectively controls the formation of chromium carbide. The stress rupture and creep resistance of TP321 stainless steel are excellent, and their stress mechanical properties are all better than that of 304 stainless steel, which is suitable for welding components at high temperature.



Table 1

Grade C Mn Si P S Cr Ni Ti
TP321 ≤0.08 ≤2.00 ≤0.75 ≤0.045 ≤0.030 17.0-20.0 9.0-13.0 5xC-0.60



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

Table 2

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



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.

A solution annealing temperature above 1950°F [1065°C] may impair the resistance to intergranular corrosion after

subsequent exposure to sensitizing conditions in TP321.



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 range OD ID WT
In. mm In. mm ±%
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 Diameter Minimum expansion of inside diameter, %
0.9 21
0.8 22
0.7 25
0.6 30
0.5 39
0.4 51
0.3 68


11 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 quantity Negotiable
Price 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


Contact Details
China Machinery Metal Jiangsu Co., Ltd.

Contact Person: Mr. lian

Tel: 86-13913685671

Fax: 86-510-86181887

Send your inquiry directly to us (0 / 3000)