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Grade 321, titanium-stabilized austenitic stainless steel

321 Stainless Steel Coil and Sheet

A chromium-nickel austenitic steel stabilized with titanium. Corrosion resistance similar to 304/304L, but titanium carbides form instead of chromium carbides at 427–816 °C (800–1500 °F), so it resists intergranular corrosion. Higher creep and stress-rupture strength than 304/304L, for parts that cannot be annealed after welding.
Tell us about your projectSee sizes
Forms
Coil, sheet
Thickness
0.15–3.0 mm
Width
1000 / 1219 / 1240 / 1500 mm
Also known as
UNS S32100, EN 1.4541, SUS321

Is Sanmei Metal the right supplier for you?

We supply stainless steel together with the processing and technical support that projects and products need.

A good fit if you

Need a specific grade, finish or size for a project, from samples or one coil to a few containers
Want it slit, cut to size or fabricated to your drawing
Need documents: a Mill Test Report with every order, SGS testing on request
Want help choosing the right grade and finish for your application
Build products or projects: equipment housings, architectural interiors, elevator and kitchen work

When buying direct from a mill may suit you better

You need standard grades in full-mill quantities and compare on price per tonne
Not sure which applies to you? Tell us about your order and we will give you our professional advice.
Tell us about your projectSee what we fabricate

Sizes we supply in 321.

Standard widths from stock, cut-to-length sheet, and custom slitting for strip-fed production lines.

321 coil

Width
1000, 1219, 1240, 1500 mm, or slit to your width
Thickness
0.15–3.0 mm
Coil weight
3–10 t

321 sheet

Width
1000, 1219, 1240, 1500 mm, or cut to size
Length
2000, 2438, 2500, 3000, 3048 mm
Thickness
0.3–3.0 mm
Every order ships with a Mill Test Report. Sample sheets and small batches are welcome. Standard mill finish: 2B finish.
Get a quote for 321Send a cut list or drawing

Why choose 321 stainless steel?

Intergranular corrosion resistance and stability at high temperature.

Intergranular corrosion resistance

Titanium stabilization keeps it resistant even after exposure in the carbide precipitation range.

High-temperature stability

Resists oxidation up to about 900 °C, with good creep and stress-rupture strength.

Mechanical properties

Strong and tough, with excellent low-temperature toughness, for high-stress uses.

Versatile

Welds and forms readily, for aerospace, chemical, and oil and gas applications.

Equivalents

ASTM / AISI

321

UNS

S32100

JIS

SUS321

EN / DIN

1.4541, X6CrNiTi18-10
Tell us what the part is, where it will be used and roughly how many. We confirm the grade and finish before you order.
Tell us your application

321 mechanical and physical properties.

Minimum mechanical values (ASTM A240) and typical physical values for annealed 321, in US and metric units.

Mechanical properties

Property
US
Metric
Yield strength, min.
30 ksi
205 MPa
Tensile strength, min.
75 ksi
515 MPa
Elongation, min.
40%
40%
Hardness, max.
95 HRB
217 HBW

Physical properties

Property
US
Metric
Density
0.286 lb/in³
7.92 g/cm³
Modulus of elasticity
28.0 × 10⁶ psi
193 GPa
Thermal expansion, 68–212 °F
9.2 × 10⁻⁶ /°F
16.6 µm/m·°C
Thermal conductivity
9.3 Btu/ft·hr·°F
16.1 W/m·K
Specific heat
0.12 Btu/lb·°F
500 J/kg·K
Electrical resistivity
28.4 µΩ·in
72 µΩ·cm

Chemical composition, % by weight, max. unless a range (ASTM A240)

Grade
C
Mn
Si
P
S
Cr
Ni
N
Ti
321
0.08
2.00
0.75
0.045
0.030
17.0–19.0
9.0–12.0
0.10
5×(C+N) to 0.70
Tell us what the part is, where it will be used and roughly how many. We confirm the grade and finish before you order.
Tell us your application

Corrosion, heat and the shop floor.

How 321 behaves in service and in fabrication.

Corrosion resistance

Similar to 304, with added resistance to intergranular corrosion from its titanium.

Heat resistance

Resists oxidation in intermittent service up to 900 °C and in continuous service up to 925 °C.

Machining

Similar to 304. It work-hardens, so it machines less easily than 410, and titanium carbides add tool wear.

Welding

Weldable by all common methods, and needs no post-weld annealing: titanium keeps the weld zone resistant to intergranular corrosion.

Cold working

Forms readily, like 304; cold work raises its strength.

Annealing

Solution anneal at about 950–1120 °C and cool rapidly. A stabilizing treatment at 850–930 °C can be applied where specified.

Hardening

Cannot be hardened by heat treatment, only by cold working.
Have a drawing, cut list or sample photo? Upload it and we review it and send you a quote.
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321 or another grade?

Pick by what the application demands.

321 vs 304

321 resists intergranular corrosion better after high-temperature exposure and holds its properties at higher temperatures. 304 costs less for general use.
Explore
304

321 vs 316

316, with molybdenum, resists corrosion better overall, above all in marine and chloride environments. 321 is better for high-temperature stability and intergranular corrosion resistance.
Explore
316

Takeaway

321 for high temperatures and welded parts that cannot be annealed; 316 for aggressive corrosion; 304 for cost-effective, less demanding service.
Not sure which grade fits?
Tell us about your application

Finishes and processing from Sanmei Metal.

Mill finishes, decorative finishes made in our own facility, and coil and sheet cut to your size.

Decorative finishes

Nickel Silver Hairline Stainless Steel Sheet S26HL-01 (3)
Hairline
Nickel Silver Satin Stianless Steel Sheet S26ST-01 (3)
Satin
black mirror polised stainless steel
Mirror
Nickel Silver Vibration Stainless Steel Sheet S26VB-01 (2)
Vibration
See all decorative finishes →

Mill finishes

Processing

Precision slitting
Cut to length
Shearing
Edge trimming
Blanking
Surface polishing
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The supplier you can trust.

Every order ships with a Mill Test Report.
Click a document to see it full size.
Get a quote with Mill Test Report

321 stainless steel FAQ.

Questions buyers ask before ordering 321.

Why is titanium added to 321?

Titanium combines with carbon to form titanium carbides, so chromium carbides do not form at grain boundaries at 427–816 °C. That keeps 321 resistant to intergranular corrosion.

Does 321 need annealing after welding?

No. It suits welded parts that cannot be annealed afterwards.

Is 321 magnetic?

No, not in the annealed condition.

How hot can 321 go?

It resists oxidation up to 900 °C intermittently and 925 °C continuously.

What sizes do you supply?

Coil in 1000, 1219, 1240 and 1500 mm widths or slit to size, 0.15–3.0 mm thick. Sheet in the same widths, 2000 to 3048 mm long, 0.3–3.0 mm thick.
Question not answered here? Ask us directly and our team will reply in person.
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Why project buyers work with Sanmei Metal

Material-driven, engineering-supported, execution-ready. One supplier from the mill to your site.
1

Source from leading partner mills

Base coil from Lisco, Tisco, Jisco, Posco PZSS, Yongjin and Hongwang, each batch with its Mill Test Report.
Our mill partners
2

Finish in-house

PVD, water plating and surface finishing under one roof at our Foshan facility.
Decorative finishes
3

Engineer and fabricate

Our engineers review drawings so profiles and panels can be made and installed.
Architectural metal works
4

Protect and ship

Film matched to laser cutting or stamping, and crates or steel frames packed for sea freight.
Packing and filming
Technical questions about grades, finishes or tolerances?
Technical guide

Our Leading Coating Technology.

Thicker coating, consistent color and easy-clean surfaces. Each one measured in our own production and compared with typical market product.
PVD coating

Thicker PVD coating

0.30µm
Typical coating thickness, up to 28% thicker than a typical market coil, so the color lasts longer.
See the coating test
Color control

Consistent color

ΔE ≤ 2
Every coil is held below the color difference the eye can see, so panels from different batches match.
See the color data
Anti-fingerprint

Fingerprint-resistant

215solvent rubs
Our anti-fingerprint coating withstood 215 rubs with a strong solvent. The standard requires 100. Typical market AF failed at 70.
See the AF test
Tested to GB/T and ISO standards, with MTR and SGS reports on request.
See all our quality control.

Documents you can check.

Every order ships with a Mill Test Report traced to its heat number, and SGS testing is available on request. These are real documents from our mill partners and our project work.
Certifications shown belong to Sanmei and its fabrication partners. Click a document to see it full size.

Tell us about your project.

Send a drawing, a reference photo or just the grade and size. Our team replies with material advice, finish options, samples and a quote.
What helps us answer fastest
Drawing, sketch or reference photo
Grade and thickness, if you know them
Finish or color you have in mind
Quantity and delivery location
Tell us about your project →
Samples and small batches are welcome.

Contact us

Creating Center, Shunde District, Foshan City, Guangdong Province, 528315, China
+8615015653566 / 0757-87668353
Paige Deng
marketing@sanmeimetal.com

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    TEL: +8615015653566 / 0757-87668353
    Email: marketing@sanmeimetal.com

    Headquarters:
    Creating Center, No.142, Yuhe Road, Lecong Town, Shunde District, Foshan City, Guangdong Province, China. 528315

    Factory: Liyuan Logistics City, Chencun Town, Shunde District, Foshan City, Guangdong Province, China. 528313

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