Hastelloy Pipes & Tubes

Hastelloy C276, C22, X, B3 and B2. Most of these alloys are available in the form of plate, sheet, bar, pipe, tubing, pipe fittings, flanges and welding material.

The registered trademark name, Hastelloy, is applied as the prefix name to more than twenty different highly corrosion resistant metal alloys produced by Haynes International, Inc. These superalloys, or high performance alloys, developed by Haynes International, are nickel-based steel alloys that exhibit traits that include high resistance to uniform attack, localized corrosion/oxidation resistance, stress corrosion cracking resistance and ease of welding and fabrication.

Alloys of identical chemical and mechanical properties are available from other manufacturers and offer excellent alternatives to the various Hastelloy® brand alloys.

The corrosion-resistant superalloys are widely used by the chemical processing, aerospace, and industrial gas turbine and marine industries. Additionally, due to the their reliable performance, areas of energy, health and environmental, oil and gas, pharmaceutical and flue gas desulfurization industries are increasingly using them.

 

Characteristics of Hastelloy

  • High resistance to uniform attack
  • Outstanding localized corrosion resistance
  • Excellent stress corrosion cracking resistance
  • Good resistance to acids such as sulfuric, nitric, hydrochloric, hydrofluoric and chromic
  • Ease of welding and fabrication
  • High resistance to oxidation at elevated temperatures

Applications of Inconel

  • Chemical Processing Industry
  • Aerospace
  • Pharmaceutical
  • Oil and gas production
  • Components where exposure to high mechanical stress and sea water are required
  • Components exposed to flue gas or flue gas desulfurization plants

Superalloys, also known as high performance alloys, have become the steel of choice for corrosion resistance and versatility.

 

Hastelloy C-22, Alloy C-22, UNS N06022, 2.4602, Ni Cr 21Mo 14 W, 21Cr-13Mo-3W-Ni, B622, NW6022(JISH4552)

Hastelloy C22, also known as alloy C22, is a versatile austenitic nickel-chromium-molybdenum-tungsten alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. This nickel steel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. Other corrosives Hastelloy C-22 has resistance to are oxidizing acid chlorides, wet chlorine, formic and acetic acids, ferric and cupric chlorides, sea water, brine and many mixed or contaminated chemical solutions, both organic and inorganic. This nickel alloy also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. This is beneficial in multi- purpose plants where such “upset” conditions occur frequently.

This nickel alloy resists the formation of grain-boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition.

Alloy C-22 should not be used in service temperatures above 1250° F due to the formation of detrimental phases which form above this temperature.

 

Hastelloy C-276, Alloy C-276, UNS N10276, 2.4819, NiMo 16Cr15W, 15.5Cr-16Mo-5Fe-Ni, B622, NW0276(JISH4552)

Hastelloy C276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.

Although there are several variations of the Hastelloy nickel alloy, Hastelloy C-276 is by far the most widely used.

Alloy C-276 is widely used in the most severe environments such as chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment, and recovery of sour natural gas.

 

Hastelloy X, UNS N06002, DIN 2.4665

Hastelloy X is a nickel-chromium-iron-molybdenum superalloy with outstanding high temperature strength, oxidation resistance, and fabricability. Alloy X’s oxidation resistance is excellent up to 2200° F. This nickel steel alloy has also been found to be exceptionally resistant to stress-corrosion cracking in petrochemical applications. Matrix stiffening provided by the molybdenum content results in high strength in a solid-solution alloy having good fabrication characteristics. Although this nickel alloy is primarily noted for heat and oxidation resistance it also has good resistance to chloride stress-corrosion cracking, carburization, and excellent resistance to reducing or carburizing atmospheres. Two common conditions that often lead to early failure in high temperature alloys, carburization and nitriding, Hastelloy X resists.

 

Hastelloy B-2, Alloy B-2, UNS N10665, 2.4617, Ni Mo 28

Hastelloy B2 is a solid solution strengthened, nickel-molybdenum alloy, with significant resistance to reducing environments like hydrogen chloride gas, and sulfuric, acetic and phosphoric acids. Molybdenum is the primary alloying element which provides significant corrosion resistance to reducing environments. This nickel steel alloy can be used in the as-welded condition because it resists the formation of grain-boundary carbide precipitates in the weld heat-affected zone.

This nickel alloy provides excellent resistance to hydrochloric acid at all concentrations and temperatures. In additions, Hastelloy B2 has excellent resistance to pitting, stress corrosion cracking and to knife-line and heat-affected zone attack. Alloy B2 provides resistance to pure sulfuric acid and a number of non-oxidizing acids.

 

Hastelloy B-3, UNS N010675

Hastelloy B-3 is a nickel-molybdenum alloy with excellent resistance to pitting, corrosion, and stress-corrosion cracking plus, thermal stability superior to that of alloy B-2. In addition, this nickel steel alloy has great resistance to knife-line and heat–affected zone attack. Alloy B-3 also withstands sulfuric, acetic, formic and phosphoric acids, and other non-oxidizing media. Furthermore, this nickel alloy has excellent resistance to hydrochloric acid at all concentrations and temperatures. Hastelloy B-3’s distinguishing feature is its ability to maintain excellent ductility during transient exposures to intermediate temperatures. Such exposures are routinely experienced during heat treatments associated with fabrication.

 

  DIN AFNOR UNS Others
Hastelloy B-2 2.4882 GNiMo30 - N30012 Hastelloy B-2(5)
Hastelloy B-3 - - N10675 Hastelloy B-3(5)
Hastelloy Hybrid BC1 - - - Hastelloy Hybrid BC1
Hastelloy C-276 2.4686 GNiMo17Cr - N30002 Hastelloy C-276 (5)
Hastelloy C-4 2.4610 NiMo16C616Ti (5) NC16D16M N26455 Hastelloy C-4 (5)
Hastelloy C-22 9.4602 - N26022 Hastelloy C-22 (5)
Hastelloy C-2000 - - N26200 Hastelloy C-2000 (5)
Hastelloy C-22HS - - - Hastelloy C-22HS (5)
Hastelloy G-30 - - N06030 Hastelloy G-30 (5)
Hastelloy G-35 2.4643 NiCr33Mo8 - N06035 Hastelloy G-35 (5)