APPLICATION OF ALLOYS IN CHEMICAL INDUSTRY

Developments in production, treatment and transportation of chemicals during the past hundred years has triggered very great changes in chemical engineering materials of construction. Scientific and technological progress is especially depends on development of chemical industry and engineering. It is clear that chemical complex has a lot of processes that take place under various aggressive environments, which impact on the durability of the equipment. Therefore, the industry has a great need for materials that ensure a relevant resistance to corrosion, high temperatures or any kind of chemical damage during the technological process on chemical production.

Among the most common chemical processes and environments, the following can be noted:

  • Phosphate and Superphosphoric Acid;
  • Phosphatic fertilizers;
  • Sulfuric acid;
  • Nitric acid;
  • Oxidizing environments;
  • Acetic Acid;
  • Recovery environments;
  • Salt production;
  • Chlorine;
  • Soda caustic;
  • Plastics Manufacturing;
  • Cellulose and paper products;
  • Synthesis of Organic Compounds;
  • Refining.

Typical materials used in chemical industry:

Stainless steel

  • Duplex steel (most of grades);
  • Austenitic steel (1.4301; 1.4307; 1.4404; 1.4420; 1.4438; 1.4439; 1.4466; 1.3964; 1.4539; 1.4547; 1.4529; 1.4565; 1.4652);

They are available for a wide range of process conditions, providing the right protection against corrosion, material deterioration or maintenance need. This includes grades for pressure vessels, heat exchangers, seawater handling, pulp bleaching, hydrometallurgy, cryogenic applications and many other applications.

  • Ferritic steel (1.4713; 1.4724; 1.4736; 1.4742; 1.4762);

High temperature ferritic grades are mainly used in high temperature applications with sulphurous atmospheres and/or at low tensile loads such as for installations within chemical industry.

Special alloys

But the demands on process parameters have continuously increased creating more and more grounds for application of high-alloyed materials. Capital expenditure and operating costs from one side and operating temperatures and pressures from other side dictate new challenges on the market.

  • Alloy 20 (W.N.: 2.4668; GOST: ХН45МВТЮБР-ВД; UNS: N07718);
  • Alloy 31 (W.N.: 1.4562; GOST: ХН30МДБ; UNS: N08031);
  • Alloy 600 (W.N.: 2.4816; GOST: ХН70Ю; UNS: N06600);
  • Alloy 625 W.N.: 2.4856; GOST: ХН75МБТЮ; UNS: N06625);
  • Alloy 690 W.N.: 2.4856; UNS: N06690);
  • Alloy 825 (W.N.: 2.4858; GOST: ХН38ВТ; UNS: N08825);
  • Alloy C-4 (W.N.: 2.4610; GOST: ХН65МВУ; UNS: N06455);
  • Alloy C-276 (W.N.: 2.4819; GOST: ХН65МВ; UNS: N10276);
  • Alloy 400 (W.N.: 2.4360; GOST: НМЖМц 28-2,5-1,5; UNS: N04400);
  • Alloy K-500 (W.N.: 2.4375; UNS: N05500);
  • Nickel 200 (W.N.: 2.4060/66; GOST: НП-1/НП-2; UNS: N02200).
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Material selection for chemical applications is not simple and is determined by parameters of chemical process or environment thereby requires special knowledge in the corresponding field.

Please contact our technical engineer for any help you may need in your specific application field.

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