- sales@hindustansteel.com
- 390/392, Ground Floor, Shankar Mansion, Vanita Vishram Chowk, S.V.P. Road, Mumbai - 400004
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+91-9820944724
+91-9820944724
Home > Our Products > Stainless Steel Plates > Application >Marine & Saltwater Applications – Stainless Steel Plates for Extreme Corrosion Resistance
Stainless steel plates are essential materials for the marine industry due to their exceptional resistance to chloride corrosion, pitting, crevice attack, and stress corrosion cracking. At Hindustan Steel Corporation, we supply marine-grade stainless steel plates that are purpose-engineered to withstand harsh saltwater conditions, offshore humidity, and long-term seawater exposure.
From shipbuilding and underwater structures to desalination plants and port equipment, our stainless steel plate grades are trusted across global marine projects
Marine-grade stainless steel refers to corrosion-resistant stainless steels specially formulated to endure continuous contact with seawater, salt spray, and marine weathering. Grades like SS 316 / 316L, SS 904L, and Duplex / Super Duplex (UNS S31803, S32750) are known for their high molybdenum and nitrogen content, offering superior resistance to localized corrosion compared to regular 304 grade.
These plates are often selected for their:
Our stainless steel plates are widely used in marine and saltwater applications such as:
Their strength, anti-corrosive performance, and long-term cost savings make them a standard for marine-grade fabrication.
Marine applications demand stainless plates that perform under pressure, salt spray, and high chloride conditions. Key mechanical properties include:
Duplex and Super Duplex grades offer up to twice the strength of austenitic stainless steel, ideal for load-bearing marine parts.
Marine-grade stainless steel plates conform to stringent international standards that ensure superior corrosion resistance and structural integrity in seawater environments:
Equivalent Grades:
| ASTM / AISI | EN | UNS | Common Name |
| 316 / 316L | 1.4401 / 1.4404 | S31600 / S31603 | Marine Grade SS |
| 904L | 1.4539 | N08904 | High Corrosion-Resistant SS |
| S31803 | 1.4462 | S31803 | Duplex SS |
| S32750 | 1.4410 | S32750 | Super Duplex SS |
We supply marine stainless steel plates in a wide range of sizes to suit shipbuilding, offshore platforms, and seawater process equipment:
Custom CNC profile cutting, waterjet cutting, and shearing available for precise marine fabrication.
To enhance performance in salt-laden atmospheres, our stainless steel plates are supplied in the annealed or solution-annealed condition:
These treatments ensure resistance against seawater-induced pitting, intergranular corrosion, and microstructural degradation over time.
Stainless steel plates used in marine and underwater components require:
Duplex plates may require preheating and controlled cooling to avoid embrittlement during welding.
Hindustan Steel Corporation supplies saltwater-resistant stainless steel plates to global coastal and offshore regions, including:
Export-Ready Packaging:
Choosing the right grade depends on:
| Application | Recommended Grade |
| General marine use | SS 316L |
| High salinity zones | SS 904L |
| Offshore platforms | Duplex 2205 (S31803) |
| Subsea pipelines | Super Duplex S32750 |
| Heat exchangers in seawater | 6Mo or 904L |
Tip: For long-term immersion or splash zones, choose duplex or super duplex grades with high PREN values (>40).
Every marine-grade stainless plate from us is:
Yes, SS 316L is suitable for general marine environments, especially when exposed to splash zones, not fully submerged.
SS 904L has excellent corrosion resistance against chlorides, sulfuric acid, and brine environments, making it suitable for harsh marine use.
Duplex stainless steel offers higher strength and better stress corrosion cracking resistance than 316L in aggressive saltwater conditions.
Yes, we export marine-grade stainless plates to shipyards and marine projects across UAE, Saudi Arabia, Qatar, Oman, and Africa.
Yes, we offer marine plates with third-party approvals like DNV, ABS, and Lloyd’s Register, along with full documentation.
Marine plates often come with 2B, No. 1, HRAP, or shot-blasted finish, depending on application and corrosion exposure.
Yes, but it requires proper filler material and post-weld cleaning to maintain corrosion resistance and prevent embrittlement.
Duplex 2205 has a PREN (Pitting Resistance Equivalent Number) of ~34–38, while Super Duplex exceeds 40, and 904L is around 35.
Yes, we provide cut-to-size plates as per shipbuilding drawings with CNC, plasma, or waterjet profiling.
Price varies by thickness and market rates. Contact us for the current per kg or per sheet price of 904L marine stainless steel.
316L is non-magnetic in annealed condition, ideal for sensitive marine instruments and structural applications.
Yes, 316L, 904L, and Duplex are all widely used in desalination plants, RO systems, and brine evaporators.
We include commercial invoice, packing list, test certificate, HS code, country of origin, and export compliance papers.
Yes, we stock marine-grade stainless steel plates at our Mumbai warehouse for immediate delivery and export.
Request a Price or Technical Datasheet
Looking for SS 316L / 904L / Duplex marine-grade stainless steel?
We provide:
+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com
390/392, Ground Floor, Shankar Mansion, S.V.P. Road, Mumbai – 400004, India
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+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com