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-An Expert Breakdown of Superalloy Types, Standards, and Selection for Industrial Use
Explore three key classification methods for superalloys—matrix, manufacturing, and application—to guide engineers in choosing materials meeting ASTM and NACE standards.
This article uses three classification methods to quickly clarify Superalloys, providing practical material selection ideas for oil and gas and process industries.
1. Classified by Matrix
Fe Ni based superalloys: relatively controllable in cost, heat-resistant to about 700 ° C; such as Alloy 800H/HT, A-286 (UNS S66286).
Ni based superalloys: universal corrosion resistance and high temperature strength; Typical grades Alloy 625 (UNS N06625)/825 (N08825)/718 (N07718)/C276 (N10276).
Co based superalloys: excellent resistance to thermal corrosion and wear; Haynes 188 and Stellite 6B are commonly used for high-temperature abrasive components.
2. Classified by Manufacturing Process
Wrought Superalloys: plates/rods/tubes, forming and welding friendly, with the widest range of engineering applications.
Cast Superalloys: Complex in shape and thick in cross-section, but with stricter welding and inspection requirements.
PM/DS/SC: Powder metallurgy, directional solidification/single crystal, suitable for extreme service such as gas turbine (less commonly used in piping systems).
Common standard reference:
ASTM B444 (Alloy 625 seamless tube), ASTM B423 (Alloy 825 seamless tube), ASTM B637 (718 deformed bar); Acidic gas fields comply with the requirements of NACE MR0175/ISO 15156.
3. Classified by Application
In the aerospace field, nickel based or cobalt based alloys with a temperature resistance of over 1000 ℃, such as Inconel 718, should be selected for use in engine turbine discs and combustion chambers;
In the field of petrochemicals, refining equipment and hydrogenation reactors need to withstand high temperatures of 800 ℃ and hydrogen sulfide corrosion. Nickel based alloys such as Incoloy 825 and Hastelloy C276 are preferred;
In the field of energy, high-temperature components in nuclear power and solar thermal power generation equipment are commonly combined with iron-based alloys (such as SUS 310S) and nickel based alloys to balance performance and cost.
Quick Selection Overview
Strong corrosion resistance/Our working conditions: C276, 625; Taking into account cost considerations, option 825 is available.
≤ 700 ° C High strength: 718 A‑286； Assessment of Waspaloy/188 in higher temperature areas.
Welding and manufacturability priority: Prioritize the Wrought system and plan for same or matching welding materials.
MTSCO covers a full range of superalloys including iron-based, nickel based, and cobalt based, and its products comply with ASTM/EN/GOST standards. It can provide various forms of products such as pipes, plates, and wires.