A297 HU

ASTM

A297 HU

ASME

SA297 HU

Type

19Cr-39Ni

UNS -Cast

N08004

Overview

Grade HU is a heat-resistant austenitic stainless steel casting alloy defined by ASTM A297/A297M, intended for high-temperature applications where moderate strength and oxidation resistance are required. It typically contains around 19% chromium and 9% nickel, offering a balance of thermal stability and corrosion resistance in oxidizing environments. HU is commonly used in furnace parts, heat-treatment trays, and general high-temperature service components. Its cost-effectiveness and reasonable resistance to scaling and deformation under heat make it a practical choice for industrial heating applications with moderate performance demands.

Chemical Composition

Carbon

0.35 - 0.75%

0.35 - 0.75%

0.35 - 0.75%

Manganese

2.00% Max

Silicon

2.50% Max

Phosphorus

0.04% Max

Sulfur

0.04% Max

Chromium

17.00 - 21.00%

Nickel

37.00 - 41.00

Molybdenum

0.50% Max

Physical Properties

Tensile Strength

65 ksi Min

Elongation at 2 in

4% Min

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© Alloy Casting Industries Ltd 2025

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© Alloy Casting Industries Ltd 2025

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© Alloy Casting Industries Ltd 2025