A351 CH20

ASTM

A351 CH20

ASME

SA351 CH20

UNS -Cast

J93402

Overview

CH20 is an austenitic stainless steel casting alloy designated under ASTM A351/A351M, developed for use in high-temperature, pressure-containing components such as furnace parts, heat exchanger manifolds, and petrochemical reformer tubes. It contains approximately 25% chromium and 12% nickel, providing a balance of oxidation resistance and mechanical strength at elevated temperatures. This alloy is commonly used in environments where exposure to thermal cycling, carburizing atmospheres, and high-temperature oxidation can degrade other materials. CH20’s robust performance under thermal stress makes it suitable for applications in the chemical processing, refining, and heat treatment industries.

Chemical Composition

Carbon

0.04 - 0.20%

0.04 - 0.20%

0.04 - 0.20%

Manganese

1.50% Max

Silicon

2.00% Max

Phosphorus

0.04% Max

Sulfur

0.04% Max

Chromium

22.00 - 26.00%

Nickel

12.00 - 15.00%

Molybdenum

0.50% Max

Mechanical Properties

Yield Strength

30 ksi Min

Tensile Strength

70 ksi Min

Elongation at 2 in

30% 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