Product Overview
COBRA-675LT is a premium cobalt-based superalloy sheet engineered for extreme environments demanding exceptional resistance to oxidation, thermal fatigue, and high-temperature creep. Compliant with ASTM F984 and certified to ASME BPVC Section II Part D, this cold-rolled and stress-relieved superalloy material delivers consistent mechanical integrity across thicknesses from 0.5 mm to 6.0 mm. As a high-performance cobalt alloy sheet, COBRA-675LT bridges the gap between aerospace-grade reliability and industrial pressure equipment requirements—making it a trusted choice among OEMs and fabricators seeking ASME BPVC-compliant superalloy materials.
Manufactured under stringent quality controls in our ISO 9001-certified forging and precision rolling facility, each coil undergoes full traceability, tensile testing, microstructure verification, and non-destructive examination (NDE). Its optimized composition—rich in cobalt, chromium, tungsten, and nickel—ensures superior hot hardness and corrosion resistance in aggressive reducing or sulfidizing atmospheres.
Key Features
- Full compliance with ASTM F984 and ASME BPVC Section II Part D for pressure boundary applications
- Cold-rolled + stress-relieved condition ensures dimensional stability and low residual stress
- Exceptional resistance to thermal cycling up to 980°C (1800°F)
- Outstanding resistance to galling, wear, and molten metal attack
- Available in custom widths and lengths with mill test reports (MTRs) per EN 10204 3.1
Technical Specifications
| Parameter |
Value |
| Alloy Type |
Cobalt-Based Superalloy (Stellite-like) |
| Standard Compliance |
ASTM F984, ASME BPVC Section II Part D |
| Thickness Range |
0.5 – 6.0 mm |
| Width Tolerance |
±0.2 mm |
| Surface Finish |
2B Cold-Rolled, Pickled & Stress-Relieved |
| Tensile Strength (RT) |
≥ 965 MPa |
| Yield Strength (0.2% Offset) |
≥ 485 MPa |
| Elongation (50 mm) |
≥ 25% |
| Hardness (HRB) |
90–100 HRB |
| Density |
8.32 g/cm³ |
| Max Service Temperature (Oxidizing) |
980°C (1800°F) |
| Heat Treatment Condition |
Stress Relieved at 1050°C ± 15°C, Air Cooled |
Applications
COBRA-675LT is widely specified in critical components where conventional superalloy materials fall short: turbine shroud segments, valve seats and trim for high-pressure petrochemical systems, burner nozzles in waste-to-energy boilers, nuclear reactor control rod sleeves, and ASME-coded furnace linings. Its COBRA-675LT designation reflects its qualification for cyclic service under ASME BPVC design rules—particularly in Sections I, III, and VIII Div. 1 & 2. Fabricators leverage its excellent cold formability and weldability (using GTAW or PAW with matching filler) to produce complex geometries without compromising code compliance.
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