What is the ASTM equivalent of 904L?

The ASTM equivalent of 904L stainless steel is typically ASTM A240 or ASTM A312, depending on the specific application. 904L is a high-alloy austenitic stainless steel that is primarily used for its excellent corrosion resistance, particularly in acidic environments like sulfuric acid and phosphoric acid applications. It contains significant amounts of nickel, chromium, and molybdenum, along with a small amount of copper for enhanced resistance to corrosion.

Key Features:
- 904L is designed to offer excellent resistance to corrosion and oxidation, especially in pitting and crevice corrosion.
- Commonly used in industries like chemical processing, pharmaceuticals, food processing, and marine environments.

ASTM Equivalents:
- ASTM A240: This specification covers stainless steel plates, sheets, and strips, including 904L for corrosion-resistant applications. It is commonly used for the production of stainless steel plates or sheets in specific thickness ranges.
- ASTM A312: This specification is for seamless, welded, and fabricated stainless steel pipes, which can include 904L material. It’s used for pressure piping systems and other high-pressure environments.

The ASTM equivalent of 904L is typically found under ASTM A240 for sheet and plate products, or ASTM A312 for pipe products. Both standards specify the material properties, testing requirements, and applications for high-alloy stainless steels like 904L, which is highly resistant to corrosion and oxidation in aggressive environments.