321 stainless is a grade that is stabilized with titanium and is often used for work between 1000 and 1600°F. A stabilizing treatment at 1550–1650°F and air cooling can be used for service temperatures up to around 1600°F to give excellent resistance to intergranular corrosion and polythionic acid stress corrosion cracking. All common ways to weld, like submerged arc, work well with 321 stainless. AWS ER347 bare wire and E347 covered electrodes are good weld fillers. 321 stainless steel is easy to work with, just like 304 stainless steel. Compared to AISI B112, it can be worked on by machines 45 percent of the time. Lakshya International offers high quality Stainless Steel 321 sheets, plates, bars, pipes, tubes, flanges, fittings, structural products and other custom products for various applications.
Chemical Composition of SS 321
|
Element |
Min |
Max |
|
C (Carbon) |
— |
0.08 |
|
Mn (Manganese) |
— |
2.00 |
|
P (Phosphorus) |
— |
0.045 |
|
S (Sulfur) |
— |
0.030 |
|
Si (Silicon) |
— |
0.75 |
|
Cr (Chromium) |
17.00 |
19.00 |
|
Ni (Nickel) |
9.00 |
12.00 |
|
Ti (Titanium) |
5 x(C+N) |
0.70 |
|
N (Nitrogen) |
— |
0.1 |
|
Fe (Iron) |
— |
Balance |
Physical Properties of Stainless Steel 321
|
Property |
Value |
|
Thermal Conductivity |
16.2 W/m·K |
|
Electrical Resistivity |
0.72 µΩ·m |
|
Modulus of Elasticity |
193 GPa |
|
Magnetic Properties |
Non-magnetic (slightly magnetic after cold work) |
UNS S32100 SS 321 Mechanical Properties
|
Property |
Value |
|
Tensile Strength |
515 MPa (min) |
|
Yield Strength |
205 MPa (min) |
|
Elongation |
40% (min) |
|
Hardness (Brinell) |
217 HB max |
|
Density |
8.0 g/cm³ |
|
Melting Range |
1399 – 1420°C |
Equivalent Grades for Stainless Steel 321
|
Standard |
Grade / Designation |
|
AISI / ASTM |
321 |
|
EN (European) |
1.4541 |
|
JIS (Japanese) |
SUS 321 |
|
DIN (German) |
X6CrNiTi18-10 |
|
IS (Indian Standard) |
321 |
Types of Stainless Steel 321 Products
Stainless Steel 321 / 347 Flanges
Stainless Steel 321/ 347 Rod/Bar
Stainless Steel 321/ 347 Hex Bar
Stainless Steel 321/ 347 Square Bar
Stainless Steel 321/ 347 Seamless Pipes
Stainless Steel 321/ 347 Welded Pipes
Stainless Steel 321 / 347 Pipe Fittings
Stainless Steel 321/ 347 Plates/Sheet
Stainless steel 321 / 347 Welded Tubes
Stainless steel 321 / 347 Seamless Tubes
Stainless Steel 321 / 347 Channels
Stainless steel 321 / 347 H Beam
Stainless Steel 321 / 347 I Beam
Stainless Steel 321 / 347 Components
Application Usage of 321 Products
Frequently Asked Questions:
What is 321 stainless steel used for?
321 stainless steel is used in exhaust systems, furnaces, heat exchangers, aircraft parts, and high-temperature equipment.
Is 321 stainless better than 304?
321 is better for high-temperature applications, while 304 is better for general corrosion use and lower cost.
What is 321 material grade?
321 is a titanium-stabilized austenitic stainless steel grade designed for heat resistance and weld stability.
Which is better, SS316 or SS321?
SS316 is better for corrosion resistance, while SS321 is better for high-temperature service.
Why is titanium added to Stainless Steel 321?
Titanium is added to prevent carbide precipitation and improve resistance after welding or heat exposure.
Is SS 321 good for exhaust systems?
Yes, SS 321 is widely used for exhaust systems because it handles heat very well.
