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Grade 439, titanium-stabilized ferritic stainless steel

439 Stainless Steel Coil and Sheet

The low-carbon, titanium-stabilized version of 409. Low carbon and nitrogen with titanium give it good corrosion resistance, weldability and formability at low cost. Used mainly in automotive exhaust systems, where it resists hot gas corrosion.
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 S40910, EN 1.4512, SUS409L

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 439.

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

439 coil

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

439 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.

What 439 is, and where it is used.

A nickel-free ferritic grade and an economical alternative to 304 in many applications.

Stabilized with titanium

Titanium ties up carbon and nitrogen, so welds keep their ductility and resistance to intergranular corrosion without post-weld annealing.

Nickel-free and magnetic

Ferritic, with no nickel: magnetic, and more economical than 304.

Applications

Where oxidation and corrosion resistance must go beyond 409, including resistance to chlorides in water: tubular manifolds and other exhaust system components.

Product forms

Most commonly supplied as sheet or coil up to about 2 mm thick.

Equivalents

ASTM / AISI

439

UNS

S43035 (also S43932)

EN

1.4510, X3CrTi17

JIS

SUS430LX

439 mechanical and physical properties.

Minimum mechanical values (ASTM A240) and typical physical values for annealed 439, in US and metric units.

Mechanical properties

Property
US
Metric
Yield strength, min.
30 ksi
205 MPa
Tensile strength, min.
60 ksi
415 MPa
Elongation, min.
22%
22%
Hardness, max.
89 HRB
89 HRB

Physical properties

Property
US
Metric
Density
0.278 lb/in³
7.70 g/cm³
Modulus of elasticity
29.0 × 10⁶ psi
200 GPa
Thermal expansion, 68–212 °F
5.8 × 10⁻⁶ /°F
10.4 µm/m·°C
Thermal conductivity
14.0 Btu/ft·hr·°F
24.2 W/m·K
Specific heat
0.11 Btu/lb·°F
460 J/kg·K
Electrical resistivity
24.8 µΩ·in
63 µΩ·cm

Chemical composition, % by weight, max. unless a range (ASTM A240, UNS S43035)

Grade
C
Mn
Si
P
S
Cr
Ni
Ti
Al
N
439
0.030
1.00
1.00
0.040
0.030
17.0–19.0
0.50
0.20+4(C+N) to 1.10
0.15
0.030

Corrosion, heat and the shop floor.

How 439 behaves in service and in fabrication.

Corrosion resistance

Resists potable water and many mildly to moderately corrosive, oxidizing environments. Better pitting resistance than 409 and 430, and not subject to the chloride stress corrosion cracking that affects austenitic grades.

Heat resistance

Good oxidation resistance at temperatures beyond the limit of 409. Long exposure at 400–500 °C can make it brittle at room temperature; annealing corrects this.

Machining

Easier to machine than standard austenitic grades such as 304.

Welding

Weldable by the usual methods, including spot, TIG, MIG, laser and high-frequency tube welding. Properly welded, it keeps its corrosion resistance and almost all its mechanical properties.

Hot working

816–1093 °C (1500–2000 °F).

Cold working

Cold works well, but needs more force than austenitic grades.

Annealing

790–871 °C (1450–1600 °F), then cool quickly. Slow cooling through 500–400 °C causes embrittlement.

Hardening

Cannot be hardened by heat treatment.

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 Stainless 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
Tell us about your projectSend a sample photo or drawing

The supplier you can trust.

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

439 stainless steel FAQ.

Questions buyers ask before ordering 439.

Is 439 austenitic or ferritic?

Ferritic. It is a titanium-stabilized ferritic stainless steel with 17–19% chromium and no nickel.

Is 439 magnetic?

Yes. Like all ferritic stainless steels, it is magnetic.

Does 439 need annealing after welding?

No. Titanium stabilization keeps the weld zone ductile and resistant to intergranular corrosion without post-weld annealing.

What is 439 used for?

Applications that need more oxidation and corrosion resistance than 409, above all automotive exhaust components such as tubular manifolds.

Can 439 be hardened?

Not by heat treatment. Cold working raises its strength slightly.

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.

Why project buyers work with Sanmei Metal

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

An integrated fabrication network in Foshan.

Material, surface processing and fabrication lines within reach of each other, coordinated as one order.
Material line
Material line
Material line
Surface processing line
Surface processing line
Surface processing line
Fabrication line
Fabrication line
Fabrication line

Coating that lasts longer, matches and stays clean.

Three things we measure on our own production, each compared with typical market product.
PVD coating

Thicker PVD coating

0.30µm
Typical market coil: 0.21–0.27 µm. Ours is up to 28% thicker.
In plain terms: the coating takes longer to wear through, so the color lasts longer.
See the coating test
Color control

Consistent color

ΔE ≤ 2
Most suppliers give no color tolerance at all. Every coil of ours is held at ΔE 2 or less.
In plain terms: reorder next year or mix batches on one wall, and the panels still match.
See the color data
Anti-fingerprint

Fingerprint-resistant

215solvent rubs
The standard asks for 100 solvent rubs. Typical market anti-fingerprint coating failed at 70; ours lasted 215.
In plain terms: fingerprints wipe off, and the coating holds up to daily cleaning.
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.

Get a qoute now

    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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      List every size you need, each with its own finish and quantity. Small batches are welcome. We'll reply by email shortly. You can also write to us at marketing@sanmeimetal.com.

      Sanmei Metal is a stainless steel supplier based in Foshan, China. We ship to customers worldwide.

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