Hastelloy C-22 (N06022)

What is Hastelloy C-22 and its applications?

Hastelloy C-22 (UNS N06022) is a nickel-chromium-molybdenum alloy containing tungsten. It is used in chemical-process equipment requiring resistance to oxidizing and reducing chemicals, pitting and crevice attack.

Chemical reactors: Vessels handling compatible aggressive process streams.
Heat exchangers: Components selected against concentration and temperature.
Process columns: Equipment requiring resistance to localized corrosion.

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Engineering Application & Selection Guide

Its relatively high chromium content improves resistance to oxidizing media compared with C-276 in relevant environments. This is an environment-specific advantage, not proof that C-22 always outperforms C-276.

Hastelloy C-22 stud bolts — For chemical flanges, define load requirements, thread condition and an appropriate assembly procedure.
Hastelloy C-22 hex bolts — For scrubber connections, review conductive fluids, dissimilar-metal contact and retained deposits.
Hastelloy C-22 socket head cap screws — For fluid-control screws, specify surface condition and whether the recess is exposed to the process medium.

Compare C-22 and C-276 against corrosion data for the actual fluid. Process changes, oxidizing impurities and cleaning solutions belong in the review; alloy matching alone does not prevent galvanic or crevice corrosion.

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Hastelloy C-22 Composition

Composition limits · wt.%

ElementWeight %

Ni: Balance
Cr: 20–22.5%
Mo: 12.5–14.5%
Fe: 2–6%
W: 2.5–3.5%
Co: ≤2.5%
C: ≤0.015%
Mn: ≤0.50%
P: ≤0.02%
S: ≤0.02%
Si: ≤0.08%
V: ≤0.35%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

Hastelloy C-22 hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Rod, bar & wire	ASTM B574 / ASME SB574
Forgings & forging stock	ASTM B462 / B564 · ASME SB564
Plate, sheet & strip	ASTM B575 / B906 · ASME SB575 / SB906
Seamless pipe & tube	ASTM B622 / B829 · ASME SB622 / SB829
Welded tube	ASTM B626 / B751 · ASME SB626 / SB751
Welded pipe	ASTM B619 / B775 · ASME SB619 / SB775
Fittings	ASTM B366 / ASME SB366

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

How to specify round bar, plate, wire and strip ↗

Hastelloy C-22 Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥690 MPa
0.2% yield strength	≥310 MPa
Elongation	≥45%

Supplied technical reference · Scanned PDF page 6 · printed page 18

Procurement and application guide

Specify the material and final condition

Review the exact medium, concentration and temperature.

Material forms in the technical reference: Round bar · Flat bar · Wire · Plate · Sheet · Strip · Pipe & tube · Forging stock · Hexagon & sections.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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