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Introduction

Hastelloy 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 C22 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.

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

Character

l    Resistant to pitting, crevice corrosion and stress  corrosion cracking

l    Outstanding resistance to both reducing and oxidizing  media

l    Excellent resistance to oxidizing aqueous media

l    Exceptional resistance to a wide variety of chemical  process environments including strong oxidizers such as ferric acids, acetic  anhydride, and seawater and brine solutions

l    Resists the formation of grain-boundary precipitates in  the weld heat-affected zone

l    Excellent weldability

Density=8.9g/cm3

Application

l    Pharmaceutical industries use alloy C-22 fittings and  tubing to avoid contamination caused by corrosion related failures

l    Cellophane manufacturing

l    Chlorination systems

l    Pesticide production

l    Incineration scrubber systems

l    Chemical process industry in equipment like flue gas  scrubbers, chlorination systems, sulfur dioxide scrubbers, pulp and paper  bleach plants, pickling systems, and nuclear fuel reprocessing

l    Waste water processing

Equal grades

UNS N06022, 2.4602, NS3308(China)

Chemical composition  (%)

C≤0.01, Cr=20.00-22.50, Co≤2.50, Fe=2.0-6.0, Mn≤0.50, Mo=12.5-14.5, P≤0.020, Si≤0.08, Si≤0.020, W=2.50-3.50, V≤0.35, Ni=remainder

Standards

ASTM B622（seamless pipe）,

ASTM B619 (welded pipe)，

ASTM B626 (welded pipe)，

ASTM B575（plate），

ASTM B574 (bar)，

ASTM B564 (forging)，

ASTM B366（fitting）

Forms available  from A-one Alloy

Seamless pipe/tube, welded pipe/tube,  plate, sheet, strip, bar, forging, flange, fitting, fastener

Hastelloy C22 sheet/plate/bar of EU/US  origin available ex-stock.

Delivery

Plenty of bars in stock.