Project Description

Hastelloy C-4 (UNS N06455)

Hastelloy C-4 (UNS N06455) is a nickel-chromium-molybdenum alloy which has improved thermal stability. In this alloy, the tungsten was totally omitted and the iron content was reduced to approximately 1%. The alloy also contains approximately 0.3% Ti. Outstanding high-temperature stability; exhibits good ductility and corrosion resistance after long-time aging at 650 to 1040°C (1200–1900°F). Resists formation of grain-boundary precipitates in weld heat-affected zones, and is suitable for most chemical process applications in the as-welded condition. Has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1040°C (1900°F). Hastelloy C-4 has exceptional resistance to a variety of chemical process environments, including hot contaminated mineral acids, solvents, chlorine, and chlorine-contaminated media (organic and inorganic, dry chlorine, formic and acetic acids, acetic anhydride, seawater, and brine). The general corrosion resistance of Alloy C-276 and Alloy C-4 was essentially the same in many corrosive environments, except that in strongly reducing media like hydrochloric acid, Alloy C-276 was better; but in highly oxidizing media, the opposite was true, that is, Alloy C-4 was better. Alloy C-4 offers good corrosion resistance to a wide variety of media including organic acids and acid chloride solutions. This alloy has found greater acceptance in European countries in contrast to Alloy C-276, which is more widely used and accepted in the United States.

Equivalent Grades

TrademarksGBJISKSASTMUNSDINW.NrGOSTBSNF
Hastelloy C-4NS3305Hastelloy C-4N06455NiMo16Cr16Ti2.4610

Product Forms

Wire, Bar, Strip, Sheet, Plate, Tube, Pipe, Pipe Fittings, Forgings

Chemical Composition,%

CPSMnSiCrNiMoFe
≤0.01≤0.025≤0.010≤1.00≤0.0514.5~16.5Bal15.0~17.0≤3.00

Typical Physical & Mechanical Properties (Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaElongation,%
8.891325-137076036362

Specifications

Rod, Bar, Wire, ForgingsASTM B462, ASME SB462, ASTM B574, ASME SB574, DIN 17752/17753/17754, ISO 9723/9724/9725, DIN 17752, ISO 9723
Plate, Sheet, StripASTM B575, ASME SB575, ASTM B906, ASME SB906, DIN 17750, ISO 6208
Pipe, TubeASTM B622, ASME SB622, ASTM B619, ASME SB619, ASTM B626, ASME SB626, ASTM B751, ASME SB751, ASTM B775, ASME SB775, DIN 17751, ISO 6207
Welding ProductsAWS A5.14 ERNiCrMo-7, ASME Ⅱ SFA-5.14 ERNiCrMo-7, ASME Ⅸ F-No.43
OthersASTM B366, ASME SB366, DIN17744

Features

  • Hastelloy C-4 attains high temperature stability
  • Good ductility & excellent corrosion resistance up to 1900oF
  • Suitable for use in chemical processing media
  • Prevents stress corrosion cracking and oxidation

Applications

  • Pollution control stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings
  • Flue gas desulfurization systems
  • Chemical processing components like heat exchangers, reaction vessels, evaporators, and transfer piping
  • Sour gas wells
  • Pulp and paper production, Waste treatment
  • Pharmaceutical and food processing equipment