Alloy 28 Plate Manufacturer

Alloy 28 carries 29.5–32.5% nickel and 26.0–28.0% chromium as its foundation, with 3.0–4.0% molybdenum and 0.6–1.4% copper rounding out the corrosion-fighting elements. Carbon stays capped at 0.02% to limit carbide precipitation during welding. Manganese runs up to 2.5% and silicon up to 1.0%, both controlled to preserve weldability. Nickel stabilizes the austenitic structure and resists reducing acid attack; chromium builds the passive oxide layer; molybdenum targets pitting and crevice corrosion in chloride media; copper adds resistance specifically against sulfuric acid. Mechanically, the plate delivers a minimum tensile strength of 490 MPa, yield strength of 220 MPa, elongation of 35%, and Brinell hardness around 200 HB. Density sits near 8.0 g/cm³, with a melting range of 1330–1380°C, thermal conductivity of roughly 11.8 W/m·K at room temperature, and a thermal expansion coefficient near 14.6 µm/m·°C between 20°C and 100°C. Sulfuric acid up to moderate concentrations, phosphoric acid across a wide concentration and temperature range, and chloride-rich brines all fall within its operating envelope, with strong resistance to pitting, crevice, and general corrosion throughout. Weldability stays good with matching filler metal and controlled heat input; forming and machining follow standard austenitic stainless practice with attention to work hardening. This composition profile is why fertilizer plants, petrochemical units, and pharmaceutical manufacturers specify Alloy 28 for tanks, heat exchangers, and other process equipment exposed to aggressive media.