825 Incoloy Bar Applied To Steam Turbine & Liquid Fuel Rocket

Incoloy Alloy is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures of 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F. Alloy Incoloy also has excellent properties down to cryogenic temperatures.

 

Incoloy 825 (Alloy 825 / UNS N08825 / W.Nr. 2.4858) is a titanium‑stabilized fully austenitic nickel‑base alloy. Its chemical composition is engineered to balance high‑temperature strength and corrosion resistance across multiple service media.

 

 

825 Incoloy Bar Chemical Composition：

INCONEL SERIES:

Item 600 601 617 625 690 718 X750 825 C ≤0.15 ≤0.1 0.05-0.15 ≤0.1 ≤0.05 ≤0.08 ≤0.08 ≤0.05 Mn ≤1 ≤1.5 ≤0.5 ≤0.5 ≤0.5 ≤0.35 ≤1 ≤1 Fe 6-10 rest ≤3 ≤5.0 7-11 rest 5-9 ≥22 P ≤0.015 ≤0.02 ≤0.015 ≤0.015 -- -- -- -- S ≤0.015 ≤0.015 ≤0.015 ≤0.015 ≤0.015 ≤0.01 ≤0.01 ≤0.03 Si ≤0.5 ≤0.5 ≤0.5 ≤0.5 ≤0.5 ≤0.35 ≤0.5 ≤0.5 Cu ≤0.5 ≤1 -- -- ≤0.5 ≤0.3 ≤0.5 1.5-3 Ni ≥72 58-63 ≥44.5 Bal ≥58 50-55 ≥70 38-46 Co -- -- 10-15 ≤1.0 -- ≤1 ≤1 -- Al -- 1-1.7 0.8-1.5 ≤0.4 -- 0.2-0.8 0.4-1 ≤0.2 Ti -- -- ≤0.6 ≤0.4 -- -- 2.25-2.75 0.6-1.2 Cr 14-17 21-25 20-24 20-23 27-31 17-21 14-17 19.5-23.5 Nb+Ta -- -- -- 3.15-4.15 -- 4.75-5.5 0.7-1.2 -- Mo -- -- 8-10 8-10 -- 2.8-3.3 -- 2.5-3.5 B -- -- ≤0.006 -- -- -- --

 

825 Incoloy Bar Mechanical Properties：

Form and Condition	Tensile Strength		Yield Strength (0.2% Offset)		Elongation, %	Hardness, Rockwell
	ksi	Mpa	Ksi	Mpa
Wire
cold drawn
Annealed	80-120	550-830	35-75	240-520	45-20	-
No. 1 Temper	105-135	725-930	70-105	480-725	35-15	-
Spring Temper	170-220	1170-1520	150-210	1035-1450	5-2	-

 

Incoloy 825 (Alloy 825 / UNS N08825 / W.Nr. 2.4858) Core Characteristics：

 

• Excellent High‑Temperature Oxidation and Corrosion Resistance: At service temperatures up to 550 °C, Alloy 825 forms a dense, well‑adherent oxide scale, effectively resisting general corrosion and oxidative spalling induced by superheated steam. Dynamic superheated‑steam tests demonstrate low and sustained oxidation rates from 1050 °F to 1150 °F (approx. 565‑621 °C).

 

• Superior Resistance to Stress and Localized Corrosion: Its high nickel content renders the alloy nearly immune to chloride‑induced stress‑corrosion cracking (SCC). Added molybdenum and copper greatly improve pitting and crevice‑corrosion performance, which is critical for components exposed to chloride‑bearing media or acidic condensate.

 

• Good Compatibility with Acidic Media: Alloy 825 provides reliable corrosion resistance in oxidizing nitric acid as well as reducing sulfuric and phosphoric acid. This versatile stability under both oxidizing and reducing conditions enables reliable service within complex variable chemical environments.

 

• Stable High‑Temperature Mechanical Properties: The alloy maintains favorable strength and toughness across room temperature to 550 °C. Typical mechanical properties comply with ASTM B425 / ASME SB425, guaranteeing structural integrity for long‑term service.

 

Alloy 825 for steam turbines and liquid‑fuel rockets:

 

 Key Applications in Steam Turbines

Superheater tubes and boiler tube bundles endure high‑pressure high‑temperature superheated steam, where metal wastage shortens service life and raises maintenance costs. Compared with conventional SA213‑T22, Incoloy 825 achieves lower corrosion rates. Tubes and fasteners machined from 825 bar resist steam‑side oxidation and erosion‑corrosion, minimizing unplanned shutdowns and improving power‑generation efficiency.

 

 Key Applications in Liquid‑Fuel Rockets

Liquid‑fuel rocket engine components withstand extreme heat‑flux density, sharp temperature swings and corrosive high‑pressure hot oxygen gas. Alloy 825 features excellent oxidation resistance and oxygen‑fire‑resistant performance for critical structures and piping. Its stable austenitic microstructure avoids phase transformation, securing dimensional stability and mechanical properties under severe thermal cycles.

 

Custom Case

 

 

Hot Tags: 825 incoloy bar applied to steam turbine & liquid fuel rocket, China 825 incoloy bar applied to steam turbine & liquid fuel rocket suppliers, incoloy alloy cylindricity, incoloy alloy delivery, Inconel 800h Pipe Fittings, incoloy alloy 800h, incoloy alloy grade, 800ht plate