Ni-Fe-Cr-Mo-Cu alloy with niobium stabilisation.
Material gradeNickel Alloy Grades
/ 01 — TECHNICAL OVERVIEW
Alloy 20 (UNS N08020)
Nesco Pipe & Tubes is a manufacturer, supplier, stockist and exporter of Alloy 20 (UNS N08020), offering pipes, tubes, flanges, butt weld fittings, sheets, plates, coils and round bars in specified dimensions, finishes, conditions and testing requirements for industrial and project applications. Availability and applicable standards are confirmed against the customer’s purchase specification.
Alloy 20 is a nickel-iron-chromium alloy with molybdenum and copper, developed for demanding corrosion environments. Its alloy chemistry provides strong resistance to sulphuric acid and selected aggressive chemical-processing media, while niobium stabilisation supports resistance to sensitisation during welding.
Alloy 20 is commonly selected for sulphuric-acid service, chemical processing, and applications involving aggressive acidic environments where conventional stainless steels may not provide the required corrosion resistance.
The correct material depends on more than corrosion resistance alone. Temperature, pressure, acid concentration, chloride exposure, chemistry, erosion, fabrication route, weldability, mechanical strength, product form, code requirements and lifecycle cost should be reviewed together. Final grade selection remains with the customer’s qualified engineer, designer or material specialist.
How it is made
01
High-purity raw materials are melted and refined to the specified UNS chemistry.
02
The ingot is remelted where required and hot worked into billet, slab or forging stock.
03
Rolling, extrusion, drawing, forging or machining creates the ordered product form.
04
Stabilized annealing or other specified heat treatment is completed according to the alloy and product specification.
05
Surface conditioning, NDT, dimensional inspection and heat-wise certification complete the supply.
Request reviewed quotation Material documents on request
/ 02 — PRODUCT DETAIL
Built around the specification.
Key characteristics and commonly referenced standards for Alloy 20 (UNS N08020).
Key features01 02 03 04
Available across multiple project product forms subject to specification.
Heat-wise traceability and MTC support.
PMI, NDT and third-party inspection options.
Common specification references
STD
ASTM B729
STD
ASTM B463 / B473
STD
ASTM B829
STD
ASME B16.5 / B16.9 — Flange / butt-weld fitting dimensions where applicable.
STD
EN / DIN / ISO — Specified European or international product standard.
STD
Customer specification — Condition, corrosion tests, NDT and supplementary requirements.
STD
Applicable current ASTM material specification — Grade- and product-form-specific Alloy 20 requirements.
/ 03 — MATERIAL RANGE
Grades matched to the service.
Commonly requested families are shown below. Availability is confirmed against the complete specification.
Material familyCommon gradesTypical selection context
Specified gradeAlloy 20 (UNS N08020)
Nickel-iron-chromium-molybdenum-copper alloy for demanding chemical and sulphuric-acid service
Alloy familyNickel Alloy
Related grades are not treated as automatic substitutes
/ 04 — SUPPLY & CUSTOMISATION
Available forms and enquiry basis.
Pipes, tubes, flanges, butt weld fittings, sheets and plates, coils and round bars.
ParameterTypical Options
01Available forms
Pipes, tubes, flanges, butt weld fittings, sheets and plates, coils and round bars.
02Product standard
State the material specification for the selected pipe, tube, flat product, bar, flange or fitting form.
03Supply condition
Stabilized annealed, cold worked, hot finished, pickled, polished or as specified.
04Dimensions
Product-form dimensions, tolerances, cut lengths and end/edge preparation.
05Testing
PMI, mechanical, corrosion, NDT or supplementary testing as required.
06Documentation
Material test certificates and inspection reports on request.
07Enquiry basis
Grade / UNS, product form, standard, dimensions, quantity and delivery destination.
/ 05 — DIMENSIONS & SIZE RANGE
Dimensions aligned to the manufacturing route.
Dimensions must be specified for the selected product form; a grade designation alone does not define size, tolerance or condition.
Product formOrdering dimensionsCondition / finishStandard basis
PipeNPS/OD, schedule or wall, length and endsSeamless/welded, heat treated and finishedMaterial standard plus ASME dimensions
TubeOD, wall, length/coil/U-bend geometrySeamless/welded, annealed and surface finishProduct-specific ASTM/EN standard
Flat productThickness, width, length or coil geometryHot/cold rolled, annealed, pickled or polishedFlat-product material standard
Bar / forgingProfile size, tolerance and cut lengthHot finished, forged, cold finished or machinedBar/forging material standard
/ 06 — MANUFACTURING STANDARDS
Standards aligned for every order.
The material standard, dimensional standard and project requirements should be stated separately.
Nickel-alloy manufacturing and dimensional references
StandardWhat it covers
Applicable ASTM B-series material standardGrade- and product-form-specific nickel alloy requirements — Material
ASME B16.5 / B16.9Flange / butt-weld fitting dimensions where applicable — Piping dimensions
ASME B36.19M or drawingPipe dimensions where applicable — Dimensions
EN / DIN / ISOSpecified European or international product standard — Alternative reference
Customer specificationCondition, corrosion tests, NDT and supplementary requirements — Project-specific
/ 07 — REFERENCE MATERIAL DATA
Alloy 20 (UNS N08020) material reference
A concise engineering reference for procurement. Exact chemical limits and mechanical acceptance values depend on product form, size, condition and the applicable specification edition; the certified material test certificate governs the supplied material.
Chemistry and alloy identityPrincipal alloying profile; certification limits follow the ordered standard.
Material referenceTechnical profile
Grade / designationAlloy 20 (UNS N08020)
Alloying systemNi-Fe-Cr-Mo-Cu alloy with niobium stabilisation.
Certification basisHeat analysis and product requirements are certified against the exact material specification stated on the purchase order.
Mechanical-property basisProduct-form and condition dependent; verify certified values.
Property basisSupply requirement
Mechanical profileMechanical properties vary between annealed conditions and product forms.
Acceptance valuesUse the tensile, yield, elongation and hardness limits in the ordered product-form standard and specified condition.
CertificationActual heat/lot results are reported on the agreed material test certificate.
/ 08 — INSPECTION & TESTING
Evidence before dispatch.
01Grade / UNS and product-standard verification
02Heat-number traceability and MTC review
03PMI against the specified alloy
04Dimensions, tolerance and surface-condition inspection
05Mechanical and hardness testing to the product specification
06Corrosion, microstructure or intergranular testing when required
07NDT and third-party witnessing against the approved inspection plan
Testing requirements are applied according to the applicable material/product standard, purchase specification and approved inspection plan.
/ 09 — PACKAGING & MARKING
Protected and traceable.
01Product-form-specific protection for machined faces, surfaces and ends
02Heat-wise segregation and durable grade identification
03Non-contaminating separators for corrosion-resistant alloys
04Moisture-resistant wrapping or export cases where required
05Package labels aligned with grade, heat, dimensions, quantity and purchase order
Packaging and marking can be adapted to customer, project and export requirements.
/ 10 — APPLICATIONS & INDUSTRIES
Engineered for demanding service environments.
From process plants to marine systems, NESCO coordinates material, dimensions and documentation around the operating conditions of each application.
01
Chemical processing02
Oil and gas03
Power generation04
Marine systems05
Heat exchangers06
Industrial fabricationIndustries servedOne supply partner across critical sectors.
Chemical processingOil & gasPower generationMarineHeat exchangersProcess equipmentGeneral engineering
/ 11 — WHY NESCO PIPE & TUBES
Built for buyers who cannot leave details to chance.
From specification review to export documentation, NESCO coordinates the technical and commercial details as one complete supply requirement.
01
Specification control
NESCO reviews the grade, product standard, dimensions, condition and acceptance criteria as one coordinated requirement.
02
Multi-material sourcing
Stainless steel, duplex, nickel alloy, copper-nickel and titanium requirements can be combined within one project enquiry.
03
Traceable documentation
Heat numbers, MTCs and agreed inspection records are aligned with the purchase order before dispatch.
04
Inspection coordination
PMI, dimensional checks, NDT and third-party witnessing can be arranged against an approved inspection plan.
05
Value-added processing
Cutting, machining, end preparation, polishing or protective finishing can be reviewed with the base material supply.
06
Export-ready packing
Identification, surface protection and packing are planned around product geometry and the final transport route.
07
Responsive RFQ review
Technical and commercial inputs are consolidated early so queries are resolved before quotation and production.
08
One accountable supply desk
NESCO provides a single contact for material, processing, documentation, packing and delivery coordination.
/ 12 — FREQUENTLY ASKED QUESTIONS
Clear answers before you specify.
Quick guidance on product selection, standards, dimensions, inspection and documentation. For project-specific requirements, NESCO will review the complete enquiry with your team.
01What product forms are available in Alloy 20 (UNS N08020)?
Availability can include pipes, tubes, flanges, fittings, sheets, plates, coils and bars, but each form must be confirmed against its own material standard and production range.
02What standard should be specified for Alloy 20 (UNS N08020)?
State both the exact grade/UNS and the product-form material standard. A plate specification cannot be assumed to cover pipe, tube, bar, flange or fitting supply.
03Can NESCO provide chemical and mechanical certificates?
Yes. An agreed material test certificate can report heat analysis and mechanical results required by the ordered specification.
04Can another grade be substituted?
Only with written approval from the responsible engineer after reviewing corrosion, strength, temperature, fabrication and code requirements.
05What information produces the fastest quotation?
Provide grade/UNS, product form, standard, size, condition, quantity, tests, certification and delivery destination.
/ 13 — REQUEST FOR QUOTATION Nesco direct sales desk
Ready to source?Start with the details you already have.
Our team will review the grade, dimensions, testing and delivery requirements together.