UNS NO8904 car halo

For any temperature and concentration of hydrochloric acid has excellent corrosion resistance. At the same time, it has good corrosion resistance to sulfuric acid, acetic acid, formic acid, phosphoric acid and other non-oxidizing media.

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Key words: nickel-based alloy material

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DESCRIPTION

- Commodity name: UNS NO8904 car halo
Overview

904L alloy is a super austenitic stainless steel designed for a variety of medium to high corrosion resistance environments. High content of chromium and nickel, plus molybdenum and copper as a combination of components, ensure the excellent corrosion resistance of this product.

Chemical composition

Nickel: 24-26

Chromium: 19-21

Molybdenum: 4-5

Copper: 1-2

Iron: balance

Carbon: ≤0.02

Manganese: ≤2

Phosphorus: ≤0.03

Sulfur: ≤0.015

Corrosion resistance

Initially developed for corrosion resistance in dilute sulfuric acid. It also has good corrosion resistance to other inorganic acids (such as hot phosphoric acid) and most organic acids.

Applications

Air pollution control - scrubbers used in coal-fired power plants
Chemical processing - processing equipment for the production of sulfuric acid, phosphoric acid, inorganic and organic acids and phosphate fertilizers
Metallurgical processing - pickling equipment using sulfuric acid
Oil and gas production - offshore processing equipment
Pharmaceutical industry - processing equipment
Pulp and paper - processing equipment
Seawater and brackish water - condensers, heat exchangers and piping systems

A nickel-chromium-molybdenum alloy with the addition of niobium, which acts with molybdenum to harden the alloy matrix, thereby exhibiting high strength properties without heat treatment. The alloy is resistant to various harsh corrosive environments, especially pitting and crevice corrosion. It is used in chemical, aviation and marine engineering, pollution control equipment, and nuclear reactors.

The low carbon alloy 625 after softening annealing is widely used in the chemical process industry, and its good corrosion resistance and high strength make it can be used as a thin structural component. 625 alloys can be applied in contact with seawater and subjected to high mechanical stress. Typical application areas:
1. Components of organic chemical processes containing chlorides, especially where acid chloride catalysts are used;
2. For the manufacture of digesters and bleaching ponds for the pulp and paper industry;

3. The absorption tower, reheater, flue gas inlet baffle, fan (wet), agitator, deflector and flue in the flue gas desulfurization system;

4. For the manufacture of equipment and components used in acid gas environments;
5. Acetic acid and acetic anhydride reaction generator;
6. Sulfuric acid condenser.