stainless steel 321 TP321H tubes pipes N32100 EN 10216-5 1.4541 Stainless Steel Tubing piping

stainless steel 321 TP321H tubes pipes N32100 EN 10216-5 1.4541 Stainless Steel Tubing piping

Type: ASME SA 213 UNS N32100 ,EN 10216-5 1.4541

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Introduce：

ASTM A213 AISI 321 UNS N32100 EN 10216 - 5 1.4541 is a stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperature in the chromium carbide precipitation range from 800 to 1500°F (427 to 816°C). Alloy 321 stainless steel tubing is stabilized against chromium carbide formation by the addition of titanium.
321 321H Stainless Steel is a titanium-stabilised version of 304, used in particular applications within the sensitizing temperature range. Its resistance to sensitization, coupled with its higher strength at high temperature makes it suitable in application where 304 will become sensitized, or where 304L has insufficient hot strength. It is not subject to weld decay intergranular corrosion when exposed to mildly corrosive environments. However, welded 321 must never be used in highly oxidising environments as it is liable to 'Knife-line' attack. However, 321 is a much better option in operating temperature environments in excess of 500° C and therefore has its own merits. Alloy 321 stainless steel tube is also advantageous for high temperature service because of its good mechanical properties. Alloy 321 stainless steel offers higher creep and stress rupture properties than Alloy 304 and, particularly, Alloy 304L also be considered for exposure where sensitization and intergranular corrosion are concern.

321 321H stainless steel is basically from 304 stainless steel. They different by a very very small addition of Titanium. The real difference is their carbon content. The higher the carbon content the greater the yield strength. 321 stainless steel has advantages in high temperature environment due to its excellent mechanical properties. Compared with 304 alloy, 321 stainless steel has better ductility and resistance to stress fracture. In addition, 304L can also be used for anti-sensitization and intergranular corrosion.

A limitation with 321 is that titanium does not transfer well across a high temperature arc, so is not recommended as a welding consumable. In this case grade 347 is preferred - the niobium performs the same carbide stabilisation task but can be transferred across a welding arc. Grade 347 is therefore the standard consumable for welding 321. Grade 347 is only occasionally used as parent plate material.
Like other austenitic grades, 321 and 347 have excellent forming and welding characteristics, are readily brake or roll formed and have outstanding welding characteristics. Post-weld annealing is not required. They also have excellent toughness, even down to cryogenic temperatures. Grade 321 does not polish well, so is not recommended for decorative applications.
Grade 304L is more readily available in most product forms, and so is generally used in preference to 321 if the requirement is simply for resistance to intergranular corrosion after welding. However 304L has lower hot strength than 321 and so is not the best choice if the requirement is resistance to an operating environment over about 500°C.

General Properties
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Heat Treatment
Fabrication
Elevated Temperature Oxidation Resistance
Oxidation Behavior of Type 321 Stainless Steel Tube
321 S32100 Chemical Composition Comparison Table

Table1.Physical Properties of 321 Stainless Steel Pipes tubes in the Annealed Condition at -20°F to +100°F according to ASTM A213

321 321H Stainless Steel Density Specific Gravity: 7.93 (kg/m3)

Tabel2. ASTM A213 / ASME SA 213 stainless steel 321 TP321H tubes chemical composition

stainless steel 321 TP321H tubes Pipes Range

stainless steel 321 TP321H tubes Pipes Range Typical Properties in the Annealed Condition
The properties quoted in this publication are typical of mill products. Unless otherwise indicated they should not be regarded as guaranteed minimum values for specification purposes.
stainless steel 321 TP321H tubes Pipes Range Recommended Maximum Service Temperature
(Oxidising Conditions)
Continuous Service 950oC
Intermittent Service  870oC
321 Stainless Steel Pipe Thermal Processing
1.    Annealing Heat  from 1050 to 1150oC and cool in air.  This ensures maximum ductility of the steel.
2.  Stress Relieving 321 can be stress-relief annealed within the sensitization temperature range 450-800oC without carbide precipitation occurring, thus avoiding the possibility of intergranular corrosion.
3.     Hot working
Initial forging and pressing temperature: 1150  - 1250oC
Finishing temperature: 950oC
stainless steel 321 TP321H tubes Pipes Corrosion Resistance

Equivalent to Grade 304 in the annealed condition, and superior if a weldment in these grades has not been post-weld annealed or if the application involves service in the 425-900°C range. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C.

stainless steel 321 TP321H tubes Pipes Heat Resistance

Good oxidation resistance in intermittent service to 900°C and in continuous service to 925°C. These grades perform well in the 425-900°C range, and particularly where subsequent aqueous corrosive conditions are present. 321H has higher hot strength, and is particularly suitable for high temperature structural applications.

stainless steel 321 TP321H tubes Pipes Heat Treatment

Solution Treatment (Annealing) - heat to 950-1120°C and cool rapidly for maximum corrosion resistance.

Stabilising - heat to 870-900°C for 1 hour per 25mm of thickness and air cool. Stabilisation is recommended for most severe service conditions (above 425°C) and particularly for material annealed at the upper side of the annealing temperature range.

Stress Relief - Heat to 700°C for 1 to 2 hours and air cool.

These grades cannot be hardened by thermal treatment.

321 Stainless Steel Pipe Welding

Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 321 and 347 with Grade 347 rods or electrodes; high silicon version of 347 is also pre-qualified for welding of 321.

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At TINSI-STEEL Stainless Tubes, quality management begins way ahead of any production step.

stainless steel 321 TP321H tubes Pipes Applications

Typical applications include:

•        Stainless Steel Reheater Tubes and Superheater Tubes for Boiler

•         Aircraft exhaust manifolds

•         Expansion joints

•         Bellows

•         Furnace parts

•         Heating element tubing

•         Heat Exchanger

•         Woven or welded screens for high temperature mineral processing

•         Spiral Welded tube for burner pipes and flues