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HASTELLOY C-22 COMPOSITION

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Super Alloy HASTELLOY(r) C22(r) alloy

Related Metals:

Inconel(r) Alloy 622
Nicrofer 5621 hMoW(tm)
HASTELLOY(r) C22(r) alloy(tm)
Nicrofer 5621(tm)                                    

Specifications:

ASTM B366
ASTM B564
ASTM B574
ASTM B575
ASTM B619
ASTM B622
DIN 2.4602
UNS N06022

Chemistry Data

Carbon

0.015 max

Chromium

20 - 22.5

Cobalt

2.5 min

Iron

2 - 6

Manganese

0.5 max

Molybdenum

12.5 - 14.5

Nickel

Balance

Phosphorus

0.02 max

Silicon

0.08 max

Sulphur

0.02 max

Tungsten

2.5 - 3.5

Vanadium

0.35 min

General Information

Principal Design Features

A wrought nickel-chromium-molybdenum alloy also containing tungsten for improved overall corrosion resistance than most other similar alloys. Developed to provide an alternative to Alloys 625 and C-276. This alloy offers excellent metallurgical stability,


Applications

The alloy is used to manufacture a wide variety of chemical process equipment such as: Flue gas scrubbers, chlorination systems, acid production and pickling systems, outlet ducting and stack liners for power plants, sulfur dioxide scrubbers, pulp and pa


Machinability

Machining is best accomplished using high speed steel tooling for drilling operations. Carbide tools work well for turning or milling. Drilling (high speed steel) speeds 10-15 surface feet /minute with feeds of 0.001" (for 1/8 " dia. hole) to 0.007"


Forming

Can be readily cold or hot formed. After hot forming, or severe cold forming, the parts should be solution heat treated.


Corrosion Resistance

Excellent performance in ammonium sulfite pulp/paper use, sulfuric acid vessels, ammonia, and many other acids. Some specific data follows. Media Concentration & Temp. Corrosion Rate mils per year Sulfuric acid 2% boiling


Welding

Readily welded by conventional methods, except that submerged arc welding should be avoided due to the high heat input and slow cooling of that method. Clean the weld areas thoroughly before welding and use matching filler metal ER NiCrMo-10 and E NiC


Heat Treatment

Solution anneal at 2050 F followed by a rapid quench.


Forging

Hot forging can be done in the temperature range of 2100 F. A solution heat treatment should be performed after forging.


Hot Working

Hot working may be done followed by a solution anneal heat treatment.


Cold Working

The alloy has very good ductility and, although stiffer than the austenitic stainless steels, cold working is the preferred means of forming. Severe cold working may cause work hardening and in this event a solution heat treatment may be used to restore


Annealing

See "Heat Treatment" for solution annealing.


Aging

The alloy may be aged at temperatures of 950 F to 1900 F for some increase in hardness and tensile strength (about 3% gain). However aging (or long exposure) at temperatures above 1400 F results in degradation of V-notch impact strength.


Hardening

Not hardenable by heat treatment. The alloy does harden due to sever cold working.


Other Physical Props

V-notch impact strength is 260 ft. lbs. at 70 F and at minus 320 F.


Physical Data

Density (lb / cu. in.)

0.314

Specific Gravity

8.69

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.1

Melting Point (Deg F)

2550

Thermal Conductivity

70

Mean Coeff Thermal Expansion

6.9

Modulus of Elasticity Tension

29.9

Mechanical Data

MSO currently has no data available for this grade.

 

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