Special grades

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heat-resistant materials: 304H, 347H
duplex grades: 1.4462, 1.4410
special grades: e.g. 904L, 245 SMO, Alloy 800, Nikkel 200/201, Hastelloy C-276, Titan Gr2, etc.

Heat-Resistant Materials

304H

Composition: Higher carbon content (0.04–0.1%), 18% chromium, 8% nickel.
Characteristics: A heat-resistant version of 304 steel, specifically designed for high-temperature applications. The increased carbon content improves strength under heat.
Applications: Boilers, heat exchangers, industrial furnaces.
Heat Resistance: Up to 800–900°C

347H

Composition: Similar to 304H but stabilised with niobium and tantalum.
Characteristics: Excellent heat resistance and corrosion resistance at high temperatures, especially in welded structures.
Applications: Heat exchangers, furnaces, petrochemical equipment.
Heat Resistance: Suitable for continuous operation at 800–850°C.

Duplex Grades

1.4462 (Duplex 2205)

Composition: 22% chromium, 5% nickel, 3% molybdenum, nitrogen-enhanced.
Characteristics: Combines the advantages of austenitic and ferritic steels: high strength and excellent corrosion resistance, particularly in chloride-rich environments. Superior resistance to stress corrosion cracking compared to austenitic steels.
Applications: Marine industry, chemical industry, pressure vessels.
Temperature Range: Limited high-temperature applications (recommended up to 250°C).

1.4410 (Super Duplex 2507)

Composition: 25% chromium, 7% nickel, 4% molybdenum.
Characteristics: Extremely high corrosion resistance and exceptional mechanical strength. Performs well in highly aggressive, saline environments.
Applications: Oil and gas industry, seawater systems, heat exchangers.
Temperature Range: Maximum 250–300°C.

Special Alloys

904L

Composition: 20–23% chromium, 25% nickel, 4–5% molybdenum, high copper content (1–2%).
Characteristics: Outstanding corrosion resistance in acidic environments, such as sulphuric and phosphoric acid. Resistant to stress corrosion cracking.
Applications: Chemical industry, seawater systems, pharmaceutical industry.

254 SMO

Composition: 20% chromium, 18% nickel, 6% molybdenum.
Characteristics: Excellent corrosion resistance, particularly in chloride-rich environments and against pitting corrosion. High strength and excellent weldability.
Applications: Marine systems, chemical industry, distillation equipment.

Alloy 800 (1.4876)

Composition: 30–35% nickel, 19–23% chromium, iron-based alloy.
Characteristics: Exceptional oxidation resistance and mechanical strength at high temperatures (600–900°C). Resists carburisation and sulphurous environments.
Applications: Heat exchangers, industrial furnaces, nuclear industry.

Nickel 200/201

Composition: Nearly pure nickel (99%+), the 201 variant with low carbon content.
Characteristics: Excellent corrosion resistance to alkalis and acids. The 201 variant tolerates higher temperatures better.
Applications: Chemical industry, food processing, electrical and thermal conductivity applications.

Hastelloy C-276

Composition: 15% chromium, 16% molybdenum, 4% iron, 50–55% nickel.
Characteristics: Exceptional corrosion resistance in a wide range of acidic and oxidising environments, such as sulphuric and phosphoric acids. Resistant to pitting and crevice corrosion.
Applications: Chemical industry, environmental protection, seawater systems.

Titanium Grade 2

Composition: Pure titanium (99%) with small amounts of oxygen and iron.
Characteristics: Excellent corrosion resistance in various environments, including seawater and acids. Lightweight, high strength and good biocompatibility.
Applications: Chemical industry, medical implants, marine systems.