Introduction

Solid Solution
Strengthened Alloy

Nickel

Iron

Chromium

Corrosion
Resistance

73

Mechanical
Behavior

67

Purity

80

Overview

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INCOLOY® alloy 800H (UNS N08810) had been known for some time that higher carbon alloy 800 had higher creep and rupture properties than low-carbon material. For that reason, Special Metals had melted to a carbon range of 0.05 to 0.10% except for special orders where customers specified a lower carbon content. The carbon range of 0.05 to 0.10% is within the ASTM and ASME specification limits for alloy 800 and is in the upper portion of that range.

Special Metals generated data for this material and presented them to the ASME Code. The Code approved higher design stresses for Section I and Divisions 1 and 2 of Section VIII, which appeared in Code Case 1325-7. Note that alloy 800H required not only a carbon range of 0.05 to 0.10% but also an average grain size of ASTM 5, or coarser.

With the issuance of Code Case 1325-7 and the common use of the term “800H”, there was no longer a need to refer to “Grade 2” because it was replaced by 800H, and the material that had been called Grade 1 became, simply, INCOLOY alloy 800.

Mechanical Properties

The major differences between alloys 800, 800H and 800HT are mechanical properties. The differences stem from the restricted compositions of alloys 800H and 800HT and the high-temperature anneals used for these alloys. In general, alloy 800 has higher mechanical properties at room temperature and during short-time exposure to elevated temperatures, whereas alloys 800H and 800HT have superior creep and rupture strength during extended hightemperature exposure.

Corrosion Resistance

Alloys 800, 800H and 800HT have the same nickel, chromium, and iron contents and generally display similar corrosion resistance. Since alloys 800H and 800HT are used for their high-temperature strength, corrosive environments to which these alloys are exposed normally involve hightemperature reactions such as oxidation and carburization.

Physical Properties

Mechanical Properties