ASTM A240 317l / S31703 / 1.4438 Stainless Steel Plate , Stainless Steel Sheet With 3.1 Certificate

Products Specification

Chemical Composition

• Carbon (C): ≤ 0.03% (low carbon content to prevent carbide precipitation, enhancing intergranular corrosion resistance).
• Chromium (Cr): 18.0–20.0% (forms a passive oxide layer for corrosion resistance).
• Nickel (Ni): 11.0–15.0% (stabilizes the austenitic structure and improves toughness).
• Molybdenum (Mo): 3.0–4.0% (enhances resistance to pitting and crevice corrosion in chloride environments).
• Other Elements: Trace amounts of manganese (Mn), silicon (Si), phosphorus (P), and sulfur (S) within standard limits.

Key Properties

1. Corrosion Resistance
   • Highly resistant to general corrosion, pitting, and crevice corrosion in acidic and chloride-rich media (e.g., seawater, chemical solutions).
   • Superior to 304/316 stainless steels in harsh environments due to the higher molybdenum content.
2. Mechanical Properties
   • Tensile Strength: ≥ 485 MPa
   • Yield Strength: ≥ 170 MPa
   • Elongation: ≥ 40%
   • Maintains ductility and toughness even at low temperatures.
3. Heat Resistance
   • Can withstand continuous service temperatures up to 800°C (1470°F) with minimal scaling and loss of strength.

Applications

• Chemical Industry: Equipment for handling acids (e.g., sulfuric, phosphoric), chlorides, and corrosive chemicals.
• Marine Engineering: Marine components, offshore structures, and seawater treatment systems.
• Food & Pharmaceutical: Hygienic equipment requiring high corrosion resistance and easy cleaning.
• Paper & Pulp Industry: Machinery exposed to bleaching agents and wet corrosive environments.
• Environmental Engineering: Wastewater treatment plants and components in aggressive water conditions.

Advantages over 316L

• Higher molybdenum content (3–4% vs. 2–3% in 316L) provides enhanced resistance to pitting and crevice corrosion in severe chloride environments.
• Suitable for applications where 316L may fall short, such as high-concentration saltwater or strong chemical exposure.

Processing and Welding

• Good formability and machinability, similar to other austenitic stainless steels.
• Welding is straightforward, but low-carbon content (≤ 0.03%) minimizes the risk of intergranular corrosion (IGC) without post-weld heat treatment.

Standards

• Compliant with international standards:
  • ASTM A240/A240M (USA)
  • EN 10088-2 (Europe)
  • JIS G4303 (Japan)