UNS S31703 Stainless steel Material Equivalent Grade

What is UNS S31703 Stainless steel Material Equivalent Grade?

Choosing the right stainless steel for your project often involves understanding how different global standards align, especially when working across regions. UNS S31703, commonly known as 317L stainless steel, is a low-carbon, molybdenum-alloyed austenitic stainless steel renowned for its superior corrosion resistance in acidic and chloride-rich environments.

As a leading exporter of stainless steel from China, Gangsteel supplies high-quality ASME SA240 Gr 317L in sheets, plates, coils, bars, and custom components, all compliant with ASME SA240 and ASTM A240 standards. With over 600 tons in stock and advanced processing capabilities, we ensure fast delivery and tailored solutions for global clients.

Gangsteel dives into the equivalent grades for UNS S31703, its chemical composition, mechanical properties, applications, and pricing, providing actionable insights for engineers and procurement professionals. Whether you're designing chemical processing equipment or marine systems, knowing these equivalents can streamline your material selection. Let’s explore.

Understanding UNS S31703 and Its Equivalent Grades

UNS S31703, or 317L stainless steel, is a low-carbon variant of 317 stainless steel, designed for enhanced weldability and exceptional corrosion resistance, particularly in acidic environments. The "L" denotes low carbon, which minimizes carbide precipitation during welding, preserving corrosion resistance.

At Gangsteel, we’ve seen UNS S31703 excel in applications where standard grades like ASME SA240 Gr 316 fall short, such as in sulfuric acid processing or pulp and paper mills.

Its equivalent grades across international standards include:

These equivalents ensure compatibility with standards like ASTM A240 stainless steel sheet or JIS G4304 stainless steel sheet, allowing you to specify ASME SA240 Gr 317L and achieve the same performance as EN 1.4438 or JIS SUS 317L. This flexibility is critical for global projects.

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Chemical Composition of UNS S31703

The UNS S31703 chemical composition is optimized for superior corrosion resistance, particularly in acidic and chloride environments, with excellent weldability. Here’s the typical composition:

The high molybdenum content (3.0-4.0%) enhances pitting and crevice corrosion resistance (PREN ~ 29-33), making UNS S31703 superior to ASME SA240 Gr 316L in acidic conditions. The low carbon content ensures weldability without sensitization, ideal for heavy welding applications.

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Mechanical Properties of UNS S31703

UNS S31703 offers a balanced combination of strength, ductility, and corrosion resistance, suitable for demanding applications:

The alloy’s properties support its use in welded structures and corrosive environments. At Gangsteel, we’ve seen clients leverage UNS S31703 in pulp and paper digesters, where its acid resistance and weldability reduce maintenance costs compared to ASME SA240 Gr 304L.

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Specifications and Forms Available

Gangsteel offers UNS S31703 in various forms to meet project requirements:

• Plate and Sheet: Thickness from 0.5 mm to 100 mm (plate), 0.1 mm to 6 mm (sheet), widths up to 4200 mm, lengths up to 12000 mm.
• Coil: Thickness 0.1 mm to 6 mm, widths up to 2000 mm.
• Bar: Diameter 6 mm to 500 mm, lengths up to 12000 mm.
• Custom Components: Flanges, fittings, and stainless cutting sheet part with tolerances of ±0.05 mm.

All products comply with ASME SA240 and ASTM A240 standards, with finishes like 2B, No.1, or BA. For piping needs, we supply ASTM A312 material or ASME SA312 material for seamless applications.

Pro Tip: For high-temperature tubing, consider our ASTM A213 material or ASME SA213 offerings.

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Applications of UNS S31703

UNS S31703 is ideal for industries requiring superior corrosion resistance and weldability:

• Chemical Processing: Tanks and reactors for sulfuric, phosphoric, and acetic acids.
• Pulp and Paper: Digesters and bleach washers handling corrosive liquors.
• Marine: Piping and fittings for seawater systems.
• Pharmaceutical: High-purity equipment for sterile manufacturing.
• Oil and Gas: Components in moderate chloride environments.

Having worked with clients globally, I’ve seen UNS S31703 outperform ASME SA240 Gr 316L in chemical plants, where its higher molybdenum content prevents pitting and extends service life.

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Comparison with Related Grades

Here’s how UNS S31703 compares to ASME SA240 Gr 317, ASME SA240 Gr 316L, and ASME SA240 Gr 317LMN:

• UNS S31703 vs ASME SA240 Gr 317: UNS S31703 offers better weldability due to lower carbon, ideal for heavy welding, while 317 is suited for general acid resistance.
• UNS S31703 vs ASME SA240 Gr 316L: UNS S31703 provides superior acid resistance with higher molybdenum, while 316L is cost-effective for chloride environments.
• UNS S31703 vs ASME SA240 Gr 317LMN: UNS S31703 is a standard choice for acid resistance, while 317LMN adds nitrogen for higher strength and corrosion resistance.

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Pricing and Availability

The ASME SA 240 Gr 317L price per kg ranges from USD 8-15 per kg (FOB), influenced by:

• Alloy Content: Higher molybdenum (3.0-4.0%) increases costs compared to ASME SA240 Gr 316L.
• Market Demand: Demand in chemical and pulp industries impacts pricing.
• Product Form: Plates may cost more than sheets due to processing.
• Global Supply Chain: Freight and raw material availability affect costs.

Gangsteel’s direct mill relationships ensure competitive pricing. Contact us for quotes or to explore related grades like ASME SA240 Gr 317LMN.

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Why Choose Gangsteel?

With extensive industry experience, Gangsteel offers:

• Quality Assurance: Compliance with ASTM A959 and ISO TR15510, with EN 10204 3.1/3.2 certificates.
• Fast Delivery: Standard orders ship in 7-15 days, with expedited options.
• Customization: Precision cutting and fabrication for stainless cutting sheet part.
• Global Reach: Serving Saudi Arabia, UAE, India, Europe, and beyond.

Our team’s expertise ensures you get the right material, whether it’s UNS S31703 or another grade like ASME SA240 Gr 316.

Contact Us

For UNS S31703 / 317L stainless steel quotes, technical data, or custom solutions, contact Gangsteel at admin@gangsteel.com. Explore our ASME SA240 stainless steel plate portfolio for more options.