What are SS 1.4539 UNS N08904 Coils?

Sometimes known as UNS N08904, SS 1.4539 is more corrosion resistant to strong acid and base. SS stands for stainless steel and “UNS” means it’s labeled according to the Unified Numbering System for alloys

Since it comprises about 20% nickel, 25% chromium, and 4.5% molybdenum, SS 1.4539 is very resistant to sulfuric acid, phosphoric acid, and areas with much chloride. Such properties turn SS 1.4539 UNS N08904 Coils into a great substitute when regular grades like 316L are not enough.

Key Properties and Characteristics

SS 1.4539 UNS N08904 Coils are known for their unique blend of corrosion resistance, strength, and fabrication. Here are the important traits that make them different:

Very strong anti-corrosion feature: Gives excellent protection against sulfuric, hydrochloric, and pitting and crevice corrosion triggered by chlorides.
High pressure in systems does not reduce its strength.
Stabilities and strength are maintained as climate rises, thus it is used in heat exchangers and condensers.
Can be welded with standard means and doesn’t require additional heat treatment afterward.
Coils and tubes can be made very easily from this metal.
Due to these qualities, SS 1.4539 can be depended on in critical areas, unlike other grades of stainless steel.

Technical Specifications

Property	Value	Unit
Chemical Composition	Cr: 19–23, Ni: 23–28, Mo: 4–5, Cu: 1–2, C ≤ 0.02, Mn ≤ 2, Si ≤ 1, P ≤ 0.045, S ≤ 0.035, N ≤ 0.10	%
Tensile Strength	≥ 500	MPa
Yield Strength	≥ 220	MPa
Elongation	≥ 35	%
Hardness	≤ 90	HRB
Density	8.0	g/cm³

SS 1.4539 UNS N08904 Coils are engineered for harsh operating environments across various sectors:

1. Chemical Processing

Used in tanks, heat exchangers, and reactors exposed to sulfuric and phosphoric acids, where lower grades fail due to corrosion.

2. Marine Industry

Good for seawater cooling systems, marine exhausts, and saltwater piping due to pitting and crevice corrosion resistance

3. Pulp and Paper

Applied in bleach plants, digester tanks, and paper-making machinery, where resistance to aggressive chemicals is crucial.

4. Desalination Plants

Essential in evaporators, heat recovery systems, and condensers in desalination units due to excellent chloride stress corrosion cracking resistance.

These applications highlight the adaptability of SS 1.4539 Coils in environments where traditional stainless steels cannot perform.

Advantages of Using SS 1.4539 UNS N08904 Coils

Choosing SS 1.4539 UNS N08904 Coils offers multiple advantages:

Good resistance to aggressive chemicals including sulfuric acid and seawater.
High performance in chloride-rich environments, reducing maintenance and replacement costs.
Good Formability and Weldability, allowing easy integration into complex systems.
Long Service Life even in extreme temperatures and pressure settings.
These coils are perfect for industrial applications where consistent performance, long service life, and reliability are essential.

FAQs (Frequently Asked Questions)

Q1: How is SS 1.4539 different from standard stainless steel grades like 316L?

A: SS 1,4539 (UNS N08904) has high nickel and molybdenum content, providing better resistance to acid and chloride than 316l.

Q2: How do I maintain SS 1,4539 UNS N08904 COIL?

A: Clean regularly with light detergent and avoid long -lasting chloride or acid without appropriate coating.

Q3: Where can I buy SS 1,4539 UNS N08904 COIL?

A: These coils are available through certified stainless steel stockists, industrial suppliers, and specialized manufacturers offering high-nickel alloys.

Conclusion

SS 1.4539 UNS N08904 Coils are a top class-grade solution for industries requiring high corrosion resistance, mechanical strength, and thermal balance. Whether for chemical plant life, marine systems, or heat exchangers, these coils provide unmatched performance.

Looking for reliable SS 1.4539 Coils on your next project?

Contact Metal Aims today to discover our range of high-quality stainless steel products and get expert guidance tailored for your industrial needs.