1.4361 (corresponding to UNS S30600) is an ultra-low-carbon, high-silicon austenitic stainless steel. Its primary characteristic is exceptional corrosion resistance in strongly oxidizing media—most notably in concentrated nitric acid and concentrated sulfuric acid.
Key Information
- Material Designation: European standard material number 1.4361, corresponding to the American UNS designation S30600; commonly referred to as X1CrNiSi18-15-4.
- Chemical Composition: Features a high silicon (Si) content (approximately 3.7%–4.3%), with ~17%–18.5% chromium (Cr), ~14%–15.5% nickel (Ni), and an ultra-low carbon (C) content (≤0.018%).
- Core Characteristics: Specifically engineered for use in concentrated nitric acid (80%–99.5% concentration) and nitric acid environments containing strong oxidizing agents; exhibits high resistance to intergranular corrosion.
- Typical Applications: Chemical processing equipment (such as heat exchangers, towers, and acid coolers), as well as transport or storage tanks. The operating temperature range is generally -50°C to 350°C (for storage tanks, a limit of 200°C is recommended).
1.4361 (S30600) is available in a variety of product forms, ranging from raw materials to near-net-shape forgings:
Primary Product Forms
- Bars and Wires: Including round, flat, and square bars, as well as precision wire.
- Plates and Strips: Covering medium-to-heavy plates, hot-rolled/cold-rolled sheets, and strips.
- Pipes and Fittings: Including seamless pipes, welded pipes, flanges, and pipe fittings.
- Forgings and Custom-Shaped Components: Such as forged or rolled rings, discs, shafts, sleeves, and complex, custom-forged geometries manufactured to specific technical drawings.
