Hastelloy C22

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.

Characteristics of Hastelloy C22

  • Resistant to pitting, crevice corrosion and stress corrosion cracking
  • Outstanding resistance to both reducing and oxidizing media
  • Excellent resistance to oxidizing aqueous media
  • Exceptional resistance to a wide variety of chemical process      environments including strong oxidizers such as ferric acids, acetic      anhydride, and seawater and brine solutions
  • Resists the formation of grain-boundary precipitates in the weld       heat-  affected zone
  • Excellent weldability

Chemical Composition %

C Cr Co Fe Mn Mo Ni P
.010 max 20-22.5 2.5 max 2.0-6.0 .50 max 12.5-14.5 Balance .02 max
Si S W V        
.08 max .02 max 2.5-3.5 .35 max        

 

Mechanical Properties

Product Form Tensile (ksi) .2% Yield (ksi) Elongation % Hardness (HRb)
Plate (.25”-1.75”) 112 53 62 89
Sheet (.038”-.15”) 122 63 54 93
Bar (.50”-5.50”) 115 55 60 89

 

 


Hastelloy C276

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.

 

Characteristics of Hastelloy C276

  • Excellent corrosion resistance in reducing environments
  • Exceptional resistance to strong solutions of oxidizing salts, such as      ferric and cupric chlorides
  • High nickel and molybdenum contents providing good corrosion           resistance in reducing environments
  • Low carbon content which minimizes grain-boundary carbide      precipitation during welding to maintain resistance to corrosion in      heat-affected zones of welded joints
  • Resistance to localized corrosion such as pitting and stress-corrosion       cracking
  • One of few materials to withstand the corrosive effects of wet      chlorine gas, hypochlorite and chlorine dioxide

Chemical Composition %

Ni
Mo Cr Fe W Co Mn C
Remainder
15.0-17.0 14.5-16.5 4.0-7.0 3.0-4.5 2.5 max 1.0 max .01 max
V
P S Si        
.35 max
.04 max .03 max .08 max        


Mechanical Properties

Product Form Tensile (ksi) .2% Yield (ksi) Elongation %
Bar 110.0 52.6 62
Plate 107.4 50.3 67
Sheet 115.5 54.6 60
Tube & Pipe 105.4 45.4 70


 


Hastelloy X

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.

Characteristics of Hastelloy X

  • Outstanding oxidation resistance through 2000° F
  • Resistant to carburization and nitriding
  • Excellent high temperature strength
  • Good resistance to chloride stress-corrosion cracking

Chemical Composition %

Ni Mo Cr Fe W Co Mn C
Remainder 8.0-10.0 20.5-23.0 17.0-20.0 .2-1.0 .5-2.5 1.0 max .05-.15
P S Si Al Ti B Cu  
.04 max .03 max 1.0 max .50 max .15 max .01 max .50 max  

 

Mechanical Properties

Temp° F Tensile (psi) .2% Yield (psi) Elongation in 2” %
70 110,600 54,900 44
1000 89,000 35,600 49
1200 83,000 35,400 54
1400 67,000 34,400 53
1600 45,000 28,200 58

 

 


Hastelloy B-2

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.

Characteristics of Hastelloy B2

  • Great resistance to stress corrosion cracking and pitting
  • Significant resistance to reducing conditions like hydrogen chloride,      sulfuric, acetic and phosphoric acids.
  • Resistance to hydrochloric acid at all concentrations and      temperatures

Chemical Composition %

Ni Mo Fe C Co Cr Mn Si
Balance 26.0-30.0 2.0 max .02 max 1.0 max 1.0 max 1.0 max .10 max
P S  
.040 max .030 max          

 

Mechanical Properties

Product Tensile Min. (ksi) .2% Yield Min. (ksi) Elongation Min.
Rod & Bar 110 51 40
Sheet/Plate 110 51 40
Welded Pipe & Tube 110 51 40
Seamless Pipe & Tube 110 45 40