Alloy Grade UNS: HPNbMA – Micro-Alloyed

  • Overview

    HPNbMA, also known as 25-35MA, is a high-temperature alloy that incorporates micro-alloying additions of reactive and rare earth elements to enhance its performance in extreme environments. These micro-alloying additions provide exceptional stability at elevated temperatures, significantly reducing carburization and surface oxidation. This makes HPNbMA particularly well-suited for applications where components are exposed to high temperatures and carbon-rich atmospheres. With a service limit of 2100 degrees Fahrenheit (1150 degrees Celsius), HPNbMA maintains its structural integrity and resists degradation even under prolonged exposure to extreme heat. This combination of high-temperature stability, oxidation resistance, and carburization resistance makes HPNbMA a valuable choice for demanding applications in industries where these properties are critical.

  • Typical Uses

    Petrochemical furnaces.

  • MetalTek Designation

    MTEK 25-35MA

  • Poured At:

    Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.35-0.55

Chromium: 23-27

Manganese: 1.5

Iron: BAL

Copper: n/a

Nickel: 33-37

Lead: n/a

Tin: n/a

Silicon: 2

Zinc: n/a

Other: Mo 0.50 MAX; Nb 0.50-1.25

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Not Heat Treated

NOTES: Elongation % for static/sand is 6

Frequently Asked Questions

Heat resistant stainless steel refers to alloys designed to maintain mechanical properties and resist oxidation at elevated temperatures.

Applications include furnace parts, heat exchangers, and components in petrochemical plants.

Heat resistant stainless steels can withstand temperatures up to 1,150°C (2,100°F), depending on the grade and exposure time.

High chromium and nickel contents stabilize the austenitic structure and form a protective oxide layer, resisting scale and oxidation.

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