Alloy 20 Sheet Manufacturer — UNS N08020, ASTM B463 Compliant
Alloy 20 is an iron-nickel-chromium alloy with niobium added to stop carbon from forming chromium carbides at the grain boundaries. This stops weld decay and intergranular attack, which is where most standard austenitic grades fail in sulfuric acid service. The grade is designated under a few different names: UNS N08020, W.Nr 2.4660, Carpenter 20, Alloy 20Cb-3, and Incoloy 20. Nandini Steel is the leading Alloy 20 sheet manufacturer for process industries in India that need corrosion-resistant material and cannot afford to compromise on the technical specifications.
What are Alloy 20 sheets?
An alloy 20 sheet is flat-rolled stock made from a nickel-iron-chromium base with copper and molybdenum added. It’s built for sulfuric acid handling, in conditions where standard stainless would give up within weeks. The UNS N08020 sheet chemistry sits around 32-38% nickel, 19-21% chromium, 3-4% copper, and 2-3% molybdenum. Copper is what deals with the sulfuric acid resistance specifically. Molybdenum handles chlorides and pitting. Fabricators use this sheet in pressure vessels, mixing tanks, and piping across chemical plants. The ASTM B463 alloy 20 sheet spec covers composition, mechanical properties, and tolerances for everything we supply, whether it’s coil or plate. We stock multiple thickness ranges so smaller requirements aren’t stuck buying a minimum order quantity that doesn’t suit them.
Nandini Steel is a Trusted Supplier, Exporter, and Stockist of Alloy 20 Sheet
Alloy 20 Sheets Key Features
- Sulfuric acid resistance: Copper alloying element cuts corrosion rates in sulfuric acid concentrations from 20% to 40% at elevated temperatures.
- Niobium stabilization: Locks carbon into stable carbides, preventing sensitization during welding and eliminating intergranular corrosion risk.
- Chloride pitting resistance: Molybdenum content improves the pitting resistance equivalent number, extending service life in chloride-containing process streams.
- Weldability: Most applications can be welded with matching filler metal (ERNiFeCr-2) in multiple passes with no post-weld heat treatment.
- Dimensional stability: A low coefficient of thermal expansion minimises distortion in manufacturing and during thermal cycling in service.
- Mechanical strength: Tensile strength of 80,000 psi minimum meets ASTM B463 requirements for pressure-retaining components.
Manufacturing Process & Quality Assurance
- Melting practice: Vacuum induction or electric arc furnace processing can control the trace elements that affect corrosion performance.
- Hot rolling: Ingots or slabs undergo hot rolling at controlled temperatures to achieve target thickness and grain structure.
- Solution annealing: Heat treatment at 1700-1750°F followed by rapid quenching restores corrosion resistance after hot working.
- Cold rolling: Additional cold reduction passes produce thinner gauges with tighter thickness tolerances for precision applications.
- Chemical Analysis: Spectrometric testing is done to confirm each heat meets UNS N08020 composition limits before release.
- Mechanical Testing: All lots are tested for tensile, yield and elongation to assure compliance with ASTM B463 mechanical property requirements.
- Third Party Inspection: Independent inspection agencies observe testing for third party verification when required by project specifications.
Available Forms, Sizes & Finishes
- Thickness range: Available in thicknesses from 0.5mm to 6mm for light fabrication to heavier vessel wall requirements.
- Standard widths: 1000mm, 1219mm, and 1500mm widths match common fabrication and shearing equipment configurations.
- Custom lengths: Cut-to-length service delivers sheets up to 6000mm for large tank and vessel fabrication.
- Surface finishes: 2B, No. 4, and mirror finishes address hygienic, aesthetic, and functional surface requirements.
- Coil form: Available in coil for clients running continuous forming or slitting operations at their own facility.
Packaging & Testing
All orders are shipped from our Mumbai facility in moisture resistant packaging with edge protection so that nothing gets damaged in transit. The sheets are crated or bundled in wood as a way to prevent movement during sea freight or road transport. All packages are marked with grade, heat number and dimensions for traceability. Testing happens before dispatch as well as at the mill. We check composition and mechanical properties against ASTM B463 limits, and mill test certificates go out with every shipment, tied to the actual heat number on the material. This matters a lot at the commissioning stage, when inspectors want to trace every plate back to where it came from before signing off.
Applications & Industries
Alloy 20 sheet is used wherever sulfuric acid or chloride exposure would rule out standard stainless. A few common uses:
- Sulfuric acid production: Reaction vessels, storage tanks, and piping exposed to concentrated acid at elevated temperatures.
- Pharmaceutical processing: Reactor linings and mixing vessels where product purity demands corrosion-free contact surfaces.
- Fertilizer manufacturing: Equipment handling phosphoric and sulfuric acid mixtures during production cycles.
- Chemical fasteners: Bolts, nuts, and fittings requiring both strength and acid resistance in assembled equipment.
- Food processing: Tanks and piping where chloride exposure and hygiene standards intersect.
- Pulp and paper: Bleaching equipment exposed to acidic and chloride-bearing process streams.
Why Choose Us as an Alloy 20 Sheet Supplier?
Nandini Steel has been sourcing alloy steel sheet and stainless steel material from Mumbai for 25 years. Every shipment comes with mill test certificates checked against ASTM and ASME standards, so procurement teams have the paperwork before the material even reaches the site. Our logistics setup moves stock fast across Indian ports and inland, which cuts down the wait after an order’s confirmed. As an Alloy 20 sheet supplier, we do custom cutting and adjust thickness or finish rather than pushing everyone toward the same standard package. We’re ISO certified, and if someone has a technical question on grade selection or certification, our team usually replies the same day.
Alloy 20 Sheet Price
Alloy 20 sheet price tracks nickel and molybdenum market rates pretty closely, since those two make up a large part of the raw material cost. Thickness matters too; thinner cold-rolled sheet costs more per kilogram to process than heavier hot-rolled plate. Finish adds to it as well; mirror finish costs more than standard 2B because of the extra processing involved. Order quantity changes things too, since mill minimum runs and cutting charges get spread differently across a large order versus a small one. Certification level plays a part; full third-party inspection and extra testing beyond the standard mill cert push the quote up. Right now, the Alloy 20 sheet price shifts weekly with nickel pricing, so we quote against live market data rather than a fixed number in a catalogue.
Need a specific Alloy 20 Sheet size? Contact our sales team for availability, customization, and quotation.
Other Types Alloy 20 Sheet
Alloy 20 Shim Sheets
Alloy 20 Hot Rolled Sheet
Alloy 20 Strip
Alloy 20 CR Sheets
Alloy 20 Steel Specification
Sheet Specifications: ASTM B463, ASME SB463
Dimensions: Available as per JIS, AISI, ASTM, GB, DIN, EN standards.
Width Range: 1000 mm to 3500 mm
Length Range: 2000 mm to 6000 mm (custom lengths available on request)
Thickness Range: 0.3 mm to 120 mm
Product Forms: Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blanks (Circles), Rings (Flanges)
Surface Finishes: Hot Rolled Plate (HR), Cold Rolled Sheet (CR), 2B, 2D, BA, No.1, No.4, No.8, 8K, Mirror, Chequered, Embossed, Hair Line, Sand Blast, Brush, Etching, SATIN (Plastic Coated)
| Grade | C | Mn | Si | S | Cu | Ni | Cr | Fe | Mo | P |
| Alloy 20 | 0.07 max | 2.00 max | 1.00 max | 0.035 max | 3.00 – 4.00 | 32.00 – 38.00 | 19.00 – 21.00 | 29.85 min* | 2.00 – 3.00 | 0.045 max |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Alloy 20 | 8.1 g/cm3 | 1443 °C (2430 °F) | Psi -80,000, MPa -551 | Psi – 35,000, MPa – 241 | 30 % |
| STANDARD | UNS | WNR. | EN | AFNOR |
|---|---|---|---|---|
| Alloy 20 | N08020 | 2.4660 | NiCr20CuMo | Z2NCUD31-20AZ |
Alloy 20 Sheet Thickness Chart
| Thickness | Thickness | Size Range | Surface Area per Unit weight | Approx Weight per Sheet | ||
| inches | mm | lbs/ft² | kg/m² | lbs | kg | |
| 0.015 | 0.381 | 36 x 96 | 0.630 | 3.07566 | 15.12 | 6.84936 |
| 0.015 | 0.381 | 36 x 120 | 0.630 | 3.07566 | 18.90 | 8.5617 |
| 0.0178 | 0.45212 | 36 x 96 | 0.756 | 3.690792 | 18.15 | 8.22195 |
| 0.0178 | 0.45212 | 36 x 120 | 0.756 | 3.690792 | 22.68 | 10.27404 |
| 0.0178 | 0.45212 | 48 x 96 | 0.756 | 3.690792 | 24.19 | 10.95807 |
| 0.0178 | 0.45212 | 48 x 120 | 0.756 | 3.690792 | 30.24 | 13.69872 |
| 0.0235 | 0.5969 | 30 x 96 | 1.008 | 4.921056 | 20.16 | 9.13248 |
| 0.0235 | 0.5969 | 30 x 120 | 1.008 | 4.921056 | 25.20 | 11.4156 |
| 0.0235 | 0.5969 | 36 x 96 | 1.008 | 4.921056 | 24.19 | 10.95807 |
| 0.0235 | 0.5969 | 36 x 120 | 1.008 | 4.921056 | 30.24 | 13.69872 |
| 0.0235 | 0.5969 | 36 x 144 | 1.008 | 4.921056 | 36.29 | 16.43937 |
| 0.0235 | 0.5969 | 48 x 96 | 1.008 | 4.921056 | 32.26 | 14.61378 |
| 0.0235 | 0.5969 | 48 x 120 | 1.008 | 4.921056 | 40.32 | 18.26496 |
| 0.0235 | 0.5969 | 48 x 144 | 1.008 | 4.921056 | 48.39 | 21.92067 |
| 0.0291 | 0.73914 | 30 x 96 | 1.260 | 6.15132 | 25.20 | 11.4156 |
| 0.0291 | 0.73914 | 30 x 120 | 1.260 | 6.15132 | 31.50 | 14.2695 |
| 0.0291 | 0.73914 | 36 x 96 | 1.260 | 6.15132 | 30.24 | 13.69872 |
| 0.0291 | 0.73914 | 36 x 120 | 1.260 | 6.15132 | 37.80 | 17.1234 |
| 0.0291 | 0.73914 | 36 x 144 | 1.260 | 6.15132 | 45.37 | 20.55261 |
| 0.0291 | 0.73914 | 48 x 96 | 1.260 | 6.15132 | 40.32 | 18.26496 |
| 0.0291 | 0.73914 | 48 x 120 | 1.260 | 6.15132 | 50.41 | 22.83573 |
| 0.0291 | 0.73914 | 48 x 144 | 1.260 | 6.15132 | 60.49 | 27.40197 |
| 0.0355 | 0.9017 | 30 x 96 | 1.512 | 7.381584 | 30.24 | 13.69872 |
| 0.0355 | 0.9017 | 30 x 120 | 1.512 | 7.381584 | 37.80 | 17.1234 |
| 0.0355 | 0.9017 | 36 x 96 | 1.512 | 7.381584 | 36.29 | 16.43937 |
Weight Per Alloy 20 Sheet
| Plate Thickness (mm) | Weight (kg/m) | kg/meter (width 1200mm) | kg/meter (width 1500mm) | kg/meter (width 1800mm) | kg/meter (width 2400mm) |
| 3 | 23.55 | 28.3 | 35.3 | 42.4 | 56.5 |
| 4 | 31.4 | 37.7 | 47.1 | 56.5 | 75.4 |
| 5 | 39.25 | 47.1 | 58.9 | 70.7 | 94.2 |
| 6 | 47.1 | 56.5 | 70.7 | 84.8 | 113 |
| 8 | 62.8 | 75.4 | 94.2 | 113 | 150.7 |
| 10 | 78.5 | 94 | 118 | 141 | 188 |
| 12 | 94.2 | 113 | 141 | 170 | 226 |
| 16 | 125.6 | 151 | 188 | 226 | 301 |
| 20 | 157 | 188 | 236 | 283 | 377 |
| 22 | 172.7 | 207 | 259 | 311 | 415 |
| 25 | 196.25 | 236 | 294 | 353 | 471 |
| 28 | 219.8 | 264 | 330 | 396 | 528 |
| 32 | 251.2 | 301 | 377 | 452 | 603 |
| 36 | 282.6 | 339 | 424 | 509 | 678 |
| 40 | 314 | 377 | 471 | 565 | 754 |
| 45 | 353.25 | 424 | 530 | 636 | 848 |
| 50 | 392.5 | 471 | 589 | 707 | 942 |
| 55 | 431.75 | 518 | 648 | 777 | 1036 |
| 60 | 471 | 565 | 707 | 848 | 1130 |
| 65 | 510 | 612 | 765 | 918 | 1224 |
| 70 | 549.5 | 659 | 824 | 989 | 1319 |
| 75 | 588.75 | 707 | 883 | 1060 | 1413 |
| 80 | 628 | 754 | 942 | 1130 | 1507 |
| 90 | 706.5 | 848 | 1060 | 1272 | 1696 |
| 100 | 785 | 942 | 1178 | 1413 | 1884 |
Alloy 20 Sheet Stockist Distributor of Following Manufacturers
ThyssenKrupp Make Alloy 20 Sheet
Aperam Make Alloy 20 Sheet
Outokumpu Make Alloy 20 Sheet
Nippon Steel & Sumitomo Metal Make Alloy 20 Sheet
Posco Make Alloy 20 Sheet
Jindal Make Alloy 20 Sheet
JFE Steel Corporation Make Alloy 20 Sheet
Essar Make Alloy 20 Sheet
Alloy 20 Sheet Finish Types
| Mumbai (Maharashtra) | Delhi | Bengaluru (Karnataka) | Chennai (Tamil Nadu) |
| Kolkata (West Bengal) | Hyderabad (Telangana) | Ahmedabad (Gujarat) | Pune (Maharashtra) |
| Jaipur (Rajasthan) | Surat (Gujarat) | Chandigarh | Lucknow (Uttar Pradesh) |
| Indore (Madhya Pradesh) | Coimbatore (Tamil Nadu) | Kochi (Kerala) | Visakhapatnam (Andhra Pradesh) |
| Nagpur (Maharashtra) | Patna (Bihar) | Bhopal (Madhya Pradesh) | Vadodara (Gujarat) |
| Mysuru (Karnataka) | Thane (Maharashtra) | Rajkot (Gujarat) | Vijayawada (Andhra Pradesh) |
| Agra (Uttar Pradesh) | Nashik (Maharashtra) | Guwahati (Assam) | Kanpur (Uttar Pradesh) |
| Faridabad (Haryana) | Gurugram (Haryana) | Noida (Uttar Pradesh) | Shimla (Himachal Pradesh) |
| Raipur (Chhattisgarh) | Udaipur (Rajasthan) | Kolkata (West Bengal) | Bhubaneswar (Odisha) |
| Dehradun (Uttarakhand) | Ranchi (Jharkhand) | Jamshedpur (Jharkhand) | Chandrapur (Maharashtra) |
| Dhanbad (Jharkhand) | Aligarh (Uttar Pradesh) | Bhubaneswar (Odisha) | Aurangabad (Maharashtra) |
| Tiruchirappalli (Tamil Nadu) | Srinagar (Jammu & Kashmir) | Ludhiana (Punjab) | Warangal (Telangana) |
| Kolkata (West Bengal) | Bikaner (Rajasthan) | Panaji (Goa) | Guntur |
Oman, Kuwait, Turkey, Yemen, Syria, Jordan, Cyprus, Saudi Arabia, Iran, Iraq, UAE, Qatar, Bahrain
South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, Nigeria, Algeria, Angola
Costa Rica, Puerto Rica, Trinidad And Tobago, Jamaica, Bahamas, Denmark, USA, Canada, Mexico, Panama
Netherland, Belgium, Greece, Czech Republic, Portugal, Hungary, Russia, Norway, Germany, France, Italy, UK, Spain, Ukraine, Croatia, Slovenia, Malta, Albania, Austria, Switzerland, Slovakia, Finland, Ireland
India, Japan, Sri Lanka, Maldives, Bangladesh, Mayanmar, Taiwan, Cambodia, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea
Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, Argentina, Bolivia, Brazil, Chile
FAQs
What is Alloy 20 sheet used for?
Mainly sulfuric acid handling equipment, pharmaceutical reactors, fertilizer tanks, and chemical fasteners, anywhere acid or chloride resistance is needed.
What standard governs Alloy 20 sheet?
ASTM B463 covers the composition, mechanical properties, and dimensional tolerances for certified Alloy 20 sheet.
Why is Alloy 20 stabilized with niobium/columbium?
Niobium during welding ties up carbon in stable carbides preventing the formation of chromium carbide at the grain boundaries and the subsequent intergranular corrosion.
Is Alloy 20 resistant to sulfuric acid?
Yes. The copper content is specifically there for sulfuric acid resistance, making it one of the few metals suited to 20-40% concentrations.
Do you export Alloy 20 sheet internationally?
We do, with export documentation, mill certificates, and packaging suited for sea freight.
What is the current price range for Alloy 20 sheet?
It moves weekly with nickel and molybdenum pricing so we quote based on thickness, finish and quantity instead of one fixed rate.
