Incoloy 890

Chemical composition % of the ladle analysis of grade Incoloy 890 and Standards

General Characteristics of Incoloy™ 890
With the addition of molybdenum and silicon, Incoloy™ 890 offers enhanced properties compared to Incoloy™ 800HT and Incoloy™ 803, providing better resistance to corrosion in high-temperature applications. A high-strength alloy, Incoloy™ 890 resists oxidation, sulfidation and carburization up to 2200°F (1204°C).

Chemical Composition of Incoloy™ 890
Nickel 42.5
Chromium 25
Aluminum 0.1
Niobium 0.4
Titanium 1 max
Carbon 0.1
Manganese 1 max
Silicon 1.8
Phosphorous 0.03 max
Sulfur 0.015 max
Copper 0.75 max
Molybdenum 1.5
Titanium 0.2
Iron remainder
Heat Treatment of Incoloy™ 890
Anneal by holding between 2050° and 2200° F (1121° and 1204°C) for a time based on thickness
Rapid air cooling or water quenching
Can be sensitized by carbide precipitation
Expose to intermediate temperature for longer times
Applications of Incoloy™ 890
ID (inside diameter) finned tubes for ethylene production in the petrochemical industry
Weldability of Incoloy™ 890
Conventional techniques
GMAW (gas metal arc)
GTAW (gas tungsten arc)
SMAW (submerged metal arc)
Inconel Welding Electrode 117 and Inconel Filler Metal 617 to increase resistance to creep and stress rupture
Inconel Filler Metal 52 and Inconel Welding Electrode 152 to increase resistance to high-heat corrosion
Inconel Filler Metal 82 and Inco-Weld Welding electrode to weld Incoloy™ 890 to structural or stainless steels in moderate heat applications
Fabricability of Incoloy™ 890
Conventional techniques
Similar to Incoloy™ 800HT and Incoloy™ 803

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Machining performance

Incoloy 890 the mechanical properties of the report, the report provides detailed performance analysis and application.
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Principal Design Features

One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.

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Machinability

Long, gummy chips characterize this alloys machinability. It can be machined in the annealed condition, however condition H1150M will yield best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.

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Heat Treatment

CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation. CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.

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Welding

Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.

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Forging

Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.

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