What is SUS439 2D Cold-Rolled stainless steel sheet?
Aug 24, 2026
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If you are looking for a cost-effective stainless steel sheet with good corrosion resistance, excellent formability, and stable performance in high-temperature environments, SUS439 2D cold-rolled stainless steel sheet is one of the commonly selected ferritic stainless steel materials. It is widely used in automotive exhaust systems, kitchen equipment, home appliances, heat exchangers, and architectural applications where moderate corrosion resistance and good processing performance are required.
What Is SUS439 Stainless Steel plate?
SUS439 stainless steel is a titanium-stabilized ferritic stainless steel with a chromium (Cr) content of approximately 17%. Compared to the austenitic grade SUS304, SUS439 contains no nickel (Ni), making it more cost-effective and less susceptible to fluctuations in nickel prices. Additionally, titanium stabilization enhances its resistance to intergranular corrosion after welding. It is designed to offer superior corrosion resistance compared to conventional ferritic grades like SUS430, while maintaining lower material costs than nickel-bearing stainless steels.
What is SUS439 2D cold-rolled finish?
The 2D finish is a common surface finish for cold-rolled stainless steel. Its production process involves hot rolling, annealing, pickling, cold rolling, and final annealing and descaling. Unlike the glossy BA finish, the 2D stainless steel surface is matte and non-reflective, presenting a uniform gray appearance.
SUS439 cold-rolled plate:2D VS BA VS NO.4
| Surface Finish | Manufacturing Process | Appearance | Typical Applications |
|---|---|---|---|
| 2D | Cold rolling + annealing + pickling | Smooth matte surface | Automotive parts, industrial equipment |
| BA | Bright annealing in protective atmosphere | Bright reflective surface | Appliances, decorative parts |
| No.4 | Grinding process | Brushed appearance | Kitchen equipment, architectural panels |
Advantages of SUS439 2D Cold-Rolled Stainless Steel Sheet
Excellent Corrosion Resistance：
SUS439 2D cold rolled stainless steel sheet contains approximately 17%–19% chromium (Cr), enabling the formation of a stable chromium oxide passive film on its surface to deliver reliable corrosion resistance. Compared to SUS430, the addition of titanium (Ti) enhances both the structural stability of the material and its post-weld corrosion resistance.
Superior Weldability：
One of the key advantages of SUS439 lies in its titanium-stabilization technology. Titanium combines with carbon and nitrogen to suppress chromium carbide precipitation during welding, thereby minimizing the risk of intergranular corrosion. Unlike certain non-stabilized ferritic stainless steels, SUS439 maintains excellent corrosion resistance in the as-welded condition without requiring post-weld heat treatment (PWHT).
High-Temperature Oxidation Resistance：
Containing 17% to 19% chromium, SUS439 can withstand elevated temperatures up to 950°C without significant scaling. Compared to SUS409, SUS439 exhibits superior oxidation resistance, making it capable of enduring more severe thermal cycling environments. It is widely used in automotive exhaust components, heat exchanger parts, and heating equipment.
Good Formability and Fabricability：
SUS439 2D cold rolled stainless steel sheet balances strength with ductility. Its typical mechanical properties in the annealed state include a tensile strength of approximately 420–600 MPa, a yield strength of ≥230 MPa, and an elongation of ≥23%. These properties allow for seamless forming via bending, stamping, laser cutting, and other processing methods, making it highly suitable for manufacturing complex automotive and industrial components.
Eco-Friendly and Resource-Efficient Material：
SUS439 is a nickel-saving stainless steel grade that reduces reliance on nickel resources while maintaining practical corrosion resistance and mechanical performance. Its long service life, 100% recyclability, and cost-effectiveness make it an ideal choice for sustainable manufacturing sectors such as automotive, home appliances, and industrial equipment.
SUS439 Stainless Steel Plate Specification
SUS439 Chemical Composition
Typical chemical composition according to stainless steel standards:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.030 |
| Silicon (Si) | ≤1.00 |
| Manganese (Mn) | ≤1.00 |
| Phosphorus (P) | ≤0.040 |
| Sulfur (S) | ≤0.030 |
| Chromium (Cr) | 17.0–19.0 |
| Titanium (Ti) | Stabilized |
| Nickel (Ni) | ≤0.50 |
| Nitrogen (N) | ≤0.030 |
Mechanical Properties of SUS439 2D Sheet
| Property | SUS439 Value |
|---|---|
| Tensile Strength | 415–550 MPa |
| Yield Strength (Rp0.2) | ≥205 MPa |
| Elongation | ≥22% |
| Hardness (HRB) | ≤85 |
| Density | 7.70 g/cm³ |
Applications of SUS439 2D Sheet
| Industry | Typical Applications |
|---|---|
| Automotive | Exhaust pipes, catalytic converter components, mufflers |
| Heat Equipment | Heat exchanger parts, heating components |
| Kitchen Equipment | Sinks, appliance panels |
| Home Appliances | Washing machines, ovens, internal structures |
| Industrial Equipment | Welded frames and corrosion-resistant components |
How to Choose SUS439 Thickness?
| Application | Recommended Thickness |
|---|---|
| Automotive Components | 0.8–2.0 mm |
| Kitchen Equipment | 0.8–1.5 mm |
| Appliance Panels | 0.5–1.2 mm |
| Industrial Fabrication | 2.0–5.0 mm |
SUS439 stainless steel plate Price per ton
SUS439 stainless steel plate typically costs between $1,000 and $2,200 USD per ton, depending heavily on global market trends, order volume, thickness, and whether it is cold-rolled or hot-rolled.
If you wish, please let me know the required thickness or specifications, as well as the intended application or operating environment.
I can help you determine whether a "2D" surface finish or another option, such as "2B," is better suited to your project.
SUS439 Stainless Steel Plate Suppliers and Manufacturers
GNEE supplies SUS439 / EN 1.4510 stainless steel sheets and coils with strict quality control throughout production. Each batch can be supplied with mill test certificates (MTC) according to EN 10204 3.1, including chemical composition, mechanical properties, and traceability information.
Available supply options include:
Thickness: 0.3–6.0 mm
Width: 1000–2000 mm
Surface: 2D, BA, No.4
Standards: JIS, EN, ASTM
Inspection: Chemical analysis, tensile testing, hardness testing, dimensional inspection
Packaging: Moisture-proof wrapping, steel pallets, export-standard protection
Packaging Details Export standard package,bundled or be required. In bundles with seaworthy wooden pallets or as per Trequirement.
FAQ
Q: How is the deep-drawing performance of SUS439 2D?
A: Excellent. SUS439 has a high r-value (plastic strain ratio), meaning there is less tendency for the material to thin out when drawn into cup or deep-channel shapes. The 2D surface finish retains lubricant well, further reducing friction during the stamping process.
Q: Is SUS439 magnetic?
A: Yes, it is strongly magnetic. SUS439 is a ferritic stainless steel; it is attracted to magnets in both annealed and cold-rolled states.
Q: Can SUS439 2D replace SUS304?
A: It can in certain applications. If your part requires resistance to stress corrosion cracking (SCC) or operates in high-temperature environments, SUS439 is more suitable than 304. Additionally, SUS439 is lower in cost. However, for strong acid environments or low-temperature applications requiring extremely high toughness, 304 remains the preferred choice.
Q: What should be considered when welding SUS439 2D?
A: Use low heat input whenever possible. Although titanium stabilization improves weldability, overheating can cause ferritic grain coarsening, thereby reducing weld toughness. Using 430Ti or 308L filler metal is recommended.
Q: Can the 2D surface undergo subsequent polishing?
A: Yes. If you purchase 2D material for deep drawing, you can apply a brushed (No. 4) or mirror (8K) finish after processing. However, if the material is intended for decorative use, it is generally recommended to purchase BA or 2B finishes directly to save on polishing costs.
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