321Triton Alloys are  the biggest stockists and suppliers of 321 or 1.4541 stainless steel, available in plate, sheet,with the ability to meet profiling requirements and distribute globally from our facility in India.Type 321 is a standard austenitic 18/8 chromium nickel alloy with the addition of Titanium making it an excellent choice in elevated temperature environments.

Used in particular applications within 450-850 degrees centigrade, 321 combines high strength with resistance to scaling and phase stability, Some typical areas of application are, furnace components, superheater and afterburner parts, compensator and expansion bellows.

These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.

Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength.

A limitation with 321 is that titanium does not transfer well across a high temperature arc, so is not recommended as a welding consumable.

Specification

Grade

UNS No

Old British

Euronorm

Swedish SS

Japanese JIS

BS

En

No

Name

321

S32100

321S31

58B, 58C

1.4541

X6CrNiTi18-10

2337

SUS 321

 

 Standards

EURONORM 1.4541 X6CrNiTi 18-10
AFNOR Z6 CNT 18-10
DIN W1.4541
ASTM A 240 – TP 321 UNS S32100

 


Chemical Composition

Grade

C

Mn

Si

P

S

Cr

Mo

Ni

N

Other

321

min.

max

-

0.08

2.00

0.75

0.045

0.030

17.0

19.0

-

9.0

12.0

0.10

Ti=5(C+N)

0.70

 

Mechanical Properties

Grade

Tensile Strength (MPa) min

Yield Strength 0.2% Proof (MPa) min

Elongation (% in 50mm) min

Hardness

Rockwell B (HR B) max

Brinell (HB) max

321

515

205

40

95

217

 

Physical Properties

Grade

Density (kg/m3)

Elastic Modulus (GPa)

Mean Coefficient of Thermal Expansion (μm/m/°C)

Thermal Conductivity (W/m.K)

Specific Heat 0-100°C (J/kg.K)

Electrical Resistivity (nΩ.m)

0-100°C

0-315°C

0-538°C

at 100°C

at 500°C

321

8027

193

16.6

17.2

18.6

16.1

22.2

500

720

 

Corrosion Resistant

Quality corrosion tests guaranteed (special request may be discussed)
TEST
Other name
Corrosion (1)
Results
ASTM A 262 A
Intergranular
Step or dual structure
ASTM A 262 B
STREICHER
Intergranular
Not recommended
ASTM A 262 C
HUEY
Intergranular
Not recommended
ASTM A 262 E
STRAUSS
Intergranular
No cracking after bending
DIN 50914
RCCM
ASTM G48 A
Pitting
Not recommended
(typical CPT = 5°C-41°F)
ASTM G48 B
ASTM G78
Crevice
Not recommended
(typical CCT ≤ 0°C-32°F)

 

Applications

Typical applications include:

         Aircraft exhaust manifolds

         Expansion joints

         Bellows

         Furnace parts

         Heating element tubing

         Heat Exchangers

         Woven or welded screens for high temperature mineral processing

         Spiral Welded tube for burner pipes and flues

 

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.


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.

Welding

Excellent weld ability by all standard fusion methods, both with and without filler metals. AS 1554.6 per-qualifies welding of 321

To find out more about Triton Alloys Inc Services and our Range of “Grade 321 Stainless Steel” which we can supply directly to you, Click Here to Contact Us.