NS333 twin screw extruder barrel blank

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: NS333 twin screw extruder barrel blank
Overview

NS333 is a tungsten-containing nickel-chromium-molybdenum alloy with extremely low silicon and carbon content.

Chemical composition

Carbon C: ≤0.08 Chromium Cr: 14.5～16.5 Nickel Ni: Balance Molybdenum Mo: 15.0～17.0 Cobalt Co: ≤2.5 Iron Fe: 4.0～7.0 Silicon Si: ≤1.00 Manganese Mn: ≤1.00 Phosphorus P: ≤0.040 Sulfur S: ≤0.030 Others (%): W 3.0～4.5, V≤0.35

Characteristics

Excellent corrosion resistance to most corrosive media in both oxidized and reduced states. Excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking.

Corrosion resistance

The high content of molybdenum and chromium enables NS333 alloy to resist corrosion from various chemical media, including reducing media such as phosphoric acid, hydrochloric acid, sulfuric acid, chlorine, organic or inorganic chlorine-containing media. Due to the high nickel content, NS333 can effectively resist stress corrosion cracking caused by chlorine, even hot chloride solutions.

Application

It has been widely used in the chemical and petrochemical fields, such as in components and catalytic systems that come into contact with chloride-containing organic matter. This material is particularly suitable for use in high temperature, inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), and seawater corrosion environments.

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.