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Corrodur 4028 QT850 Martensitic Stainless Steel – Technical Datasheet

Overview

Corrodur 4028 (1.4028, X30Cr13) is a high-carbon martensitic stainless steel supplied in the quenched and tempered (QT850) condition. It offers high strength, moderate corrosion resistance, and good hardenability, making it suitable for structural components, fasteners, and cutlery.

General Properties

Property Value
Density 7.7 g/cm³

Mechanical Properties (QT850 Condition)

Property Value Note
Tensile Strength (Rm) 850 – 1000 MPa
Yield Strength (Rp0.2) 650 MPa
Elongation (A5) 10 %
Charpy Impact Energy (V-notch) 12 J
Brinell Hardness 460 HB Quenched
Rockwell C Hardness 48 HRC

Thermal Properties

Property Temperature Range Value Note
Coefficient of Thermal Expansion 20 – 100 °C 10.5 × 10⁻⁶ /K
Coefficient of Thermal Expansion 20 – 200 °C 11.0 × 10⁻⁶ /K
Coefficient of Thermal Expansion 20 – 300 °C 11.5 × 10⁻⁶ /K
Coefficient of Thermal Expansion 20 – 400 °C 12.0 × 10⁻⁶ /K
Specific Heat Capacity – 460 J/(kg·K)
Thermal Conductivity – 30 W/(m·K)

Electrical Properties

Property Value
Electrical Resistivity 650 nΩ·m (6.5×10⁻⁷ Ω·m)

Chemical Composition (wt%)

Element Content
Carbon (C) 0.26 – 0.35
Chromium (Cr) 12 – 14
Manganese (Mn) 0.80 max
Silicon (Si) 0.80 max
Molybdenum (Mo) 0.50 max
Nickel (Ni) 1.00 max
Phosphorus (P) 0.03 max
Sulfur (S) 0.01 – 0.025
Iron (Fe) Balance

Technological Properties

Property Details
Typical Applications Automotive, decorative, kitchenware, electronics, mechanical engineering, pump/valve components, cutlery & blades
Corrosion Resistance Good in chloride-free, mildly corrosive media (soaps, detergents, organic acids). Good oxidation resistance up to ~600 °C. Not resistant to intergranular corrosion in as-delivered or as-welded condition. Optimal resistance achieved in hardened & polished condition. PRE = 12–14. Slightly lower than 1.4021 due to higher carbon tying up chromium.
Machinability Machines similar to carbon steels of equivalent hardness. Parameters vary with microstructure/hardness.
Heat Treatment Soft Annealing: 745 – 825 °C, slow air cool.
Hardening: 950 – 1050 °C, air or oil quench. Ensure sufficient soak to dissolve carbides.
Tempering (QT850): 625 – 675 °C. Avoid 400 – 600 °C (undesirable precipitation).
Stress Relief: 200 °C, hardness ≤ 48 HRC (460 HB).
Hot Forming Formable at 800 – 1100 °C.
Processing History Quenched & tempered QT850, stress relieved before peeling.
Welding Generally not recommended. If unavoidable: preheat 300 – 400 °C, post-weld temper to restore ductility. Filler: Novonit® 4551 recommended. Shielding gas must be free of H₂ and N₂. Cool below Ms (~120 °C) before tempering.

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