Incoloy 020 (N08020)

What is Incoloy 020 and its applications?

Incoloy 020 (UNS N08020) is a niobium-stabilized austenitic alloy containing nickel, chromium, molybdenum and copper. It is used in chemical equipment, particularly for compatible sulfuric-acid process environments.

Chemical processing: Tanks, heat exchangers and process piping.
Pharmaceutical and food equipment: Components in chemically compatible process streams.
Fluid handling: Pumps, valves, fittings and fasteners.

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Engineering Application & Selection Guide

Copper contributes to sulfuric-acid resistance, while niobium helps control sensitization through carbide stabilization. Neither addition establishes immunity to intergranular corrosion or a universal safety margin over 316L.

Incoloy 020 stud bolts — For sulfuric-acid flanges, state concentration, temperature, contaminants and operating changes.
Incoloy 020 hex bolts — For process-equipment supports, define the condition and whether the joint contacts the process fluid.
Incoloy 020 socket head cap screws — For dosing pumps, review housing compatibility, crevices and the proposed assembly procedure.

When comparing Incoloy 020 and Incoloy 825, review corrosion data for the actual medium, concentration and temperature. Their composition ranges overlap in important respects; no single-element ranking establishes the correct choice.

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Incoloy 020 Composition

Selected composition limits · wt.%

ElementWeight %

Ni: 32–38%
Cr: 19–21%
Mo: 2–3%
Cu: 3–4%
Nb + Ta: 8×C–1.0%
Fe: Balance

ASTM / ASME specifications by product form

Finished-product requirements

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

Incoloy 020 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 B473 / ASME SB473
Billet & forging stock	ASTM B472 / ASME SB472
Plate, sheet & strip	ASTM B463 / B906 · ASME SB463 / SB906 · ASTM A240 / A480 · ASME SA240 / SA480
Seamless pipe & tube	ASTM B729 / B829 · ASME SB729 / SB829
Welded tube	ASTM B468 / B751 · ASME SB468 / SB751
Welded pipe	ASTM B464 / B775 · ASME SB464 / SB775
Fittings & flanges	ASTM B366 / B462 · ASME SB366 / SB462

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

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Incoloy 020 Mechanical Properties

Reference sample and condition

Data basis: Published tensile-test result
Condition: Stabilize annealed · 0% cold reduction
Test temperature: Room temperature

Key properties	Value
Tensile strength	661 MPa
0.2% yield strength	306 MPa
Elongation	38%

Special Metals · Incoloy Alloy 020 · Technical bulletin · identity, composition, applications and listed specifications ↗

Procurement and application guide

Specify the material and final condition

Confirm acid concentration, contaminants 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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