909

High-Temp Steel

909

Low-expansion superalloy, excellent low-cycle fatigue. (ASTM B637; equiv UNS N19909 / AMS 6544). Nominal values—confirm mill certificate.

Chemical Composition (%)

NI	37
CR	11
CO	12
MO	4
NB	4

Mechanical Properties

Tensile:≥1410 MPa;Yield:≥1000 MPa

Chinese Standard

ASTM B637 909

Equivalent Standards

AMS 6544

Applications

低膨胀高温合金，低周疲劳优。,Bar

Available Forms

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈14%) raises hot corrosion and wear resistance. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.

Uses

Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.

Heat Treatment

Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.

Precautions

UNS N19909

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909