Marine Stainless Steel

marine stainless steel

Marine stainless steel, also known as marine grade stainless steel, is a type of stainless steel specifically designed to withstand harsh and corrosive marine environments. It is specifically designed to provide excellent corrosion resistance, strength and durability for a variety of marine applications.

It is highly resistant to the corrosive effects of seawater, salt spray and other aggressive marine environments. This resistance is primarily due to the high levels of chromium, molybdenum and nickel present in marine grade stainless steel. These alloying elements form a protective oxide layer on the surface of the steel, preventing corrosion and ensuring long-term performance. There are various grades of marine stainless steel, the most commonly used are austenitic stainless steel grades, such as 316 and 316L.


Marine Stainless Steel Plate Size:
Thickness (mm): 3 – 100
Width (mm): 1000 – 3000
Length (mm): 2000 – 12000

Marine Stainless Steel Pipe Size:
Outer Diameter (mm): 6 – 610
Wall Thickness (mm): 0.5 – 50
Length (m): 1 – 12

Available, welcome to consult

A) Packaging Details: Standard export seaworthy packing or as required.
B) Delivery Time: 30-50 days, 7 days for stock goods.
C) Loading Port: Shanghai, Tianjin, Qingdao.
D) Offer Ability: 3000MT/Per Month.
E) MOQ: 1 Pcs.

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Gnee supplies marine stainless steel in rich forms

The marine stainless steel produced by Gnee complies with ABS certification and meets international standards and specifications such as ASTM/EN/ISO. They can be manufactured in a variety of shapes, sizes and forms, allowing the production of complex marine components, structures and accessories.

In shipbuilding, it is used in hulls, decks, bulkheads and superstructures. It is also used on offshore platforms, subsea equipment and oil and gas exploration and production facilities. Marine grade stainless steel is used in seawater piping systems, heat exchangers, propellers, shafts, valves, fasteners and fittings.

more information About marine Grade stainless steel
Product NameMarine Stainless Steel
Marine Grade Stainless Steel
Shipbuilding Stainless Steel
SizeMarine Stainless Steel Plate Size:
Thickness (Mm): 3 – 100
Width (Mm): 1000 – 3000
Length (Mm): 2000 – 12000
Support Customization

Marine Stainless Steel Pipe Size:
Outer Diameter (Mm): 6 – 610
Wall Thickness (Mm): 0.5 – 50
Length (m): 1 – 12
Support Customization
TechniqueHot Rolled / Cold Rolled
Typical Grades316L Marine Stainless Steel
304 Marine Stainless Steel
904L Marine Stainless Steel
Surface Treatment2B, 2D, BA, No.1, No.3, No.4, No.6, No.7, No.8, HL(Hairline), SB(Scotch-Brite), 6k, 8k, 12k, LASER, EMBOSSED
Customized ServicesSupport Customization
Processing ServicesCutting, Bending/Forming, Welding, Hole Processing/Grooving, Surface Treatment, Custom Processing, Etc.
MOQ1 Pcs
Delivery Time30-50 Days, 7 Days For Stock Goods
Packaging DetailsStandard Export Seaworthy Packing Or As Required
Loading PortShanghai, Tianjin, Qingdao
Offer Ability4500mt/Per Month
Shipbuilding Stainless Steel Supplier With Rich Grade
  • 304 (UNS S30400, EN 1.4301)
  • 316 (UNS S31600, EN 1.4401)
  • 316L (UNS S31603, EN 1.4404)
  • 317L (UNS S31703, EN 1.4438)
  • 904L (UNS N08904, EN 1.4539)
  • 2205 (UNS S32205, EN 1.4462)
  • 2507 (UNS S32750, EN 1.4410)
  • 2550 (UNS S32750, EN 1.4507)
ASTMASTM B637, ASTM B564, ASTM F468, ASTM F467, ASTM F2281, ASTM F2282, ASTM F2283, ASTM F738M, ASTM F837, ASTM F879
ASMEASME B18.2.1, ASME B18.2.2, ASME B18.31.3, ASME B18.24, ASME B18.2.6, ASME B18.2.8, ASME B18.2.9, ASME B18.2.10, ASME B18.2.11, ASME B18.2.13, ASME B18.5, ASME B18.21.1, ASME B18.21.2, ASME B18.26.1, ASME B18.27, ASME B18.31.1, ASME B18.31.2
UTS–Unified Thread StandardUNC, UNF, UNEF, UNS, NPT, NPTF
Parameters Of marine stainless steel
C (max)
Si (max)0.750.751
Mn (max)222
P (max)0.0450.0450.045
S (max)
Tensile Strength (MPa)515485490
Yield Strength (MPa)205170220
Elongation (%)404035
Hardness (HB)201217200
Density (g/cm³)888
Melting Point (°C)1400-14501370-14001300-1390
Thermal Conductivity (W/m·K)16.316.312.5
Specific Heat Capacity (J/kg·K)500500500
Electrical Resistivity (μΩ·cm)727575
marine stainless steel Applications
  • Marine Structures and Equipment
  • Marine Components and Equipment
  • Interior and Exterior Decorative Applications
  • Marine Environment Support Systems
Why Choose Gnee marine stainless steel Manufacturer?

Gnee, as a Chinese stainless steel & nickel alloy supplier with 15 years of history, exports to 60+ countries. We provide various shapes of stainless steel & nickel alloy, including plates, coils, pipes, bars, and fittings. Gnee is committed to providing comprehensive stainless steel solutions, with excellent after-sales service, we support customization and ensure product quality.

In addition, our steel plate has been successfully exported to more than 60 countries such as Singapore, Malaysia, The United Arab Emirates, Oman, Turkey, Nigeria, Egypt, Kuwait, Indonesia, Qatar, and Kenya. Many regular customers come to visit our company and factory and make multiple orders.

What‘s The Feature Of 316L marine stainless steel?

Marine stainless steel is primarily known for its exceptional corrosion resistance properties. It contains a high percentage of chromium, which forms a passive oxide layer on the surface, protecting the steel from corrosion caused by exposure to seawater, humidity, and various corrosive agents present in marine environments. This corrosion resistance significantly extends the lifespan of marine stainless steel products.

Marine stainless steel exhibits excellent durability and strength, making it capable of withstanding the harsh conditions encountered in marine environments. It offers high tensile and yield strength, allowing the products to endure mechanical stress, vibrations, and impacts common in marine applications. This durability ensures reliable performance and minimizes the need for frequent repairs or replacements.

Marine stainless steel products are relatively low maintenance compared to other materials. The corrosion resistance of stainless steel reduces the need for regular inspections, repairs, and maintenance associated with corrosion-related issues. It is resistant to staining, easy to clean, and does not require specialized coatings or treatments to maintain its performance and appearance.

What Services Does Gnee Provide?

Gnee can provide the following measurement services for stainless steel:

Dimensional Measurement: Measure dimensional parameters such as length, width and thickness by measuring instruments to ensure that the stainless steel is qualified and meets the design requirements.
Surface Measurement: Measure parameters such as flatness, bumpiness and surface roughness of the stainless steel surface to help ensure that the quality and surface condition of the stainless steel meets the requirements.
Thickness Measurement: Use thickness gauges to accurately measure the thickness of the stainless steel to ensure it meets the design requirements.
Material Measurement: Use material analysis instruments to measure the chemical composition and mechanical properties of the stainless steel to ensure that the quality and properties of the stainless steel meet the requirements.
Bending And Deformation Measurements: Use tools such as bending gauges and displacement sensors to measure and monitor the degree of bending and deformation of stainless steel to ensure that it is within the allowable range.

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Gnee can customize the size and shape of your stainless steel for your specific project needs. Custom design of stainless steel is carried out by a team of professional engineers and designers. Based on the project requirements and constraints, they will use calculation and simulation tools combined with experience and technical knowledge to optimize the stainless steel design to meet the specific needs of your different projects

● Adjustment of the thickness, width and length of stainless steel based on load calculations and strength requirements for structural design.
● The shape of the stainless steel can be designed according to the demand characteristics.
● If the convenience of installation and maintenance is considered, we can also add openings and passages for easy access and operation in the design for areas that require frequent maintenance.

Ask Customized Services

Sourcing Gnee stainless steel can provide the following further processing services. We can customize to meet the specific needs of our customers for different projects.

Cutting Service: Stainless steel can be custom cut to obtain the desired shape and size according to the customer’s needs. For example, flame cutting, plasma cutting, laser cutting, etc., can cut stainless steel into desired plates, blocks, shaped pieces, etc.
Bending & Forming: Stainless steel is bent and formed by applying stress and appropriate processes to obtain the desired shape.
Welding Services: Stainless steel can be subjected to various types of welding services, including manual arc welding, gas-shielded welding, laser welding, etc.
Hole Turning And Machining: Stainless steel is turned and holes are machined through the use of machining equipment. These processes produce smooth surfaces, precise holes and threads to meet specific assembly requirements.
Surface Treatments: Surface treatments can be applied to improve the corrosion resistance and aesthetics of the stainless steel. This includes methods such as painting, hot dip galvanizing, and electroplating to add a protective layer and provide corrosion resistance.

Ask Deep Processing Services

Gnee stainless steel can provide testing and the following third-party inspection services. These third-party testing services provide independent and objective verification of stainless steel’s compliance with relevant standards and regulations.

Mechanical Property Testing: Used to determine whether the strength, toughness, ductility and other mechanical properties of stainless steel meet the specified requirements.
Chemical Composition Analysis: Quantitative determination of elements on stainless steel samples through spectral analysis, atomic absorption spectroscopy, inductive coupling and other technologies.
Corrosion Performance Test: Common corrosion performance test methods include salt spray corrosion test, acid-base corrosion test and electrochemical corrosion test.
Tensile Strength Test: Through the tensile test, the parameters such as yield strength, tensile strength and breaking strength of stainless steel during the tensile process are measured.
Non-Destructive Testing: Non-destructive testing is used to evaluate hidden defects, cracks and looseness in stainless steel materials. Common methods include ultrasonic testing, magnetic particle testing, eddy current testing, and radiographic testing.
Pressure Test: By exposing stainless steel products to a specific pressure, it is tested whether there are problems such as leakage or deformation to ensure that its pressure resistance meets the requirements.
Surface Quality Test: Used to evaluate the surface flatness, smoothness and oxide layer of stainless steel products.
Welding Performance Test: Check the appearance, mechanical properties and metallographic microstructure of the weld to ensure that the quality of the stainless steel welded joint meets the requirements.
Metallographic Inspection: Through metallographic inspection, the structure, grain size, non-metallic inclusions, etc. of stainless steel are checked to evaluate its quality and performance.

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