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Alloy 20 Open-Die Forged Bar
Heavy sections brought down on an open-die press to your drawing.
Request Availability →Alloy 20 Forged Bar
Open-die forged Alloy 20 sections for valve bodies, tube sheets and rings above the bar ceiling.
Copper at 3.0–4.0%
Copper holds the passive film of this Alloy 20 forged bar alive under reducing conditions, which is what carries it through sulfuric acid.
Niobium Tied to Carbon
Moreover, niobium plus tantalum at eight times carbon stabilises this Alloy 20 forged bar, so a weld zone needs no post-weld anneal.
Nickel Above a Third
Furthermore, nickel at 32.0–38.0% puts chloride stress corrosion cracking out of reach for this forged bar.
PRODUCT OVERVIEW
About Alloy 20 Forged Bar
Alloy 20 forged bar comes out of UNS N08020, the niobium-stabilised nickel-iron-chromium grade built around its copper content. Copper between 3.0% and 4.0% and nickel between 32.0% and 38.0% carry this Alloy 20 forged bar through acid duty.
We forge and test sections above the B473 bar ceiling to ASTM B462, with the reduction schedule agreed in advance. We supply this forged bar to ASTM B473 and ASME SB473 in hot-finished, annealed and cold-finished states, with the ASTM B462 forging route above the bar ceiling and ASTM B472 behind the billets. The heat number, the anneal and quench route we ran and the EN 10204 3.1 report travel with every forged bar consignment.
Meanwhile, the niobium addition is what lets a fabricated vessel of this forged bar go into service without a solution treatment after welding. The full chemistry window and the physical data behind this forged bar sit on our Alloy 20 material page, should you want to cross-reference them.
PRODUCT FEATURES
Key Features of Alloy 20 Forged Bar
Alloy 20 forged bar comes out of UNS N08020, the niobium-stabilised nickel-iron-chromium grade whose copper content carries it through sulfuric acid. We supply ASTM B462 forged bar as open-die forged sections, solution annealed and water quenched for acid plant, pickling house liquor and tankhouse duty. Every Alloy 20 forged bar consignment travels with heat-number traceability, EN 10204 3.1 mill test reports and full export documentation.
Alloy 20
Copper at the Signature Level
For example, 3.0–4.0% copper in this forged bar keeps the passive film alive where a plain austenitic grade loses it.
01
Wide Acid Concentration Span
Specifically, the copper addition lets this forged bar serve across a broad sulfuric acid range rather than only at one end.
02
Niobium Stabilisation
Moreover, niobium plus tantalum at eight times carbon keeps the weld zone of this forged bar stable without a furnace pass.
03
Chloride Cracking Out of Reach
Therefore, nickel above a third of the analysis gives this forged bar immunity to chloride stress corrosion cracking.
04
Cold Work Sets the Strength
In addition, nothing in this forged bar responds to aging, so drawing is the only route above the annealed floor.
05
No Hardness Figure Applies
Besides, B473 carries no hardness column, so this forged bar clears on chemistry and tensile results alone.
06
Sour Service Listed
Consequently, NACE MR0175 covers this forged bar at the condition that document names, and we document that condition per heat.
07
Essentially Non-Magnetic
Finally, the austenitic matrix keeps this forged bar non-magnetic for instrument and seal work.
08
WHY CHOOSE US
Why Choose Alloy 20
A forged valve body puts the reduction schedule and the cooling route ahead of the weight. Therefore, we agree the forging band, the quench and the test position of this Alloy 20 forged bar up front.
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Duty Read Before Pricing
We record the acid, its concentration and its temperature for your Alloy 20 forged bar before proposing a delivery state.
02
Certificates Tied to the Heat
Specifically, each forged bar consignment carries EN 10204 3.1 papers, heat numbers and dimensional records.
03
One Route for Welders and Machinists
In addition, this forged bar flows through one process whether your shop welds it into a vessel or turns it on a lathe.
04
Terms Stated in Writing
Quotations for this forged bar name the acid, the section, the finish and the document set rather than leaving them open.
MANUFACTURING PROCESS
Reliable Production For Critical Applications
Producing Alloy 20 forged bar runs from charge balancing through to the final pack. We log each stage behind this Alloy 20 forged bar against its own heat number.
01
Charge Weighing
The charge for this forged bar balances nickel, chromium and copper inside the B462 composition table.
02
Melting and Refining
First, the charge for this forged bar melts and refines under AOD practice that brings carbon down to the ceiling.
03
Niobium Addition
Next, we add niobium so that this forged bar carries eight times the carbon content in the finished analysis.
04
Hot Reduction
Then, forging and rolling reduce the ingot to this forged bar section between 1230 °C and 925 °C.
05
Stabilising Anneal
After that, we hold this forged bar between 940 °C and 1010 °C so the niobium carbide goes back into solution.
06
Water Quenching
We then drop this forged bar into the tank, because a slow pass through 600–900 °C would precipitate carbide and sigma.
07
Pickling and Finishing
Subsequently, pickling, turning or grinding brings this forged bar to the ordered size and surface.
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Testing and Release
Finally, we clear this forged bar for dispatch once chemistry, tensile and dimensional checks come back.
Manufacturing Facility
MANUFACTURING CAPABILITY
Advanced Production For Nickel Alloy Products
One schedule carries both stock lengths and bespoke heats of Alloy 20 forged bar. Besides, we quote this Alloy 20 forged bar through our bar and rod program.
20,000+ m²
Factory Area
Hot working, annealing, quenching and finishing lines behind the forged bar share this site.
50+
Production Machines
Units for hot working, annealing, quenching and grinding of this forged bar.
600 Tons
Monthly Capacity
Forged bar tonnage across stock lots and bespoke heats.
30+
Technical Engineers
Metallurgists who write the anneal and quench plan that this forged bar follows.
30+ Countries
Export Reach
In addition, sealed export packing sends this forged bar to buyers on five continents.
QUALITY ASSURANCE
Strict Quality Control From Production To Delivery
Nothing leaves until the heat behind your Alloy 20 forged bar clears our ISO 9001 route. In addition, the checks on this Alloy 20 forged bar follow the requirements the order names.
01
Heat Identification
We match the grade and heat number on this forged bar to your purchase order before anything leaves the yard.
02
Chemistry Verification
Specifically, copper, nickel and niobium in this forged bar go against the B473 table for your lot.
03
Tensile Verification
In addition, every heat of this forged bar carries reported tensile, yield and reduction-of-area values measured against the B473 floor.
04
Quench Record Referenced
The cooling record behind this forged bar travels with its EN 10204 3.1 papers.
PRODUCT FORMS
Available Product Forms
The list below covers the variants we quote for Alloy 20 forged bar from your drawing rather than a stock list. In addition, this list covers the deliveries ordered most often for this Alloy 20 forged bar.
02
Alloy 20 Forged Ring
Rings rolled or expanded for flanges, seal rings and wear parts.
Request Availability →
03
Alloy 20 Forged Disc
Discs forged for valve bodies, hubs and machined housings.
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04
Alloy 20 Tube Sheet Blank
Blanks forged for exchangers, with the test coupon placed before drilling.
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05
Alloy 20 Custom Forged Bar
Sections shaped to your drawing, and we fix the test position before the press opens.
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APPLICATIONS
Engineered For Demanding Industries
Alloy 20 forged bar suits plant where sulfuric acid sits in the process rather than visiting it. In addition, the list below sets out where this Alloy 20 forged bar serves.
Discuss Your Application →
01
Alloy 20 Sulfuric Acid Valve Bodies
Bodies forged for valves that sit on the acid side of a process.
02
Alloy 20 Exchanger Tube Sheet Blanks
Blanks forged for exchangers and released before the drilling operation starts.
03
Alloy 20 Flange and Nozzle Rings
Rings forged for flanged connections on acid vessels.
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Alloy 20 Pump Casing Sections
Casings forged for pumps that move acid slurries.
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Alloy 20 Column Support Rings
Rings carrying internal packing inside an acid absorption tower.
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Alloy 20 Reactor Nozzle Blanks
Blanks forged for nozzles welded into acid reactors.
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Alloy 20 Agitator Hub Blanks
Hubs forged to carry large agitator shafts in acid service.
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Alloy 20 Acid Tank Manway Rings
Rings forged for manways that open during a shutdown.
TECHNICAL INFORMATION
Technical Specifications
Detailed technical information including chemical composition, mechanical properties, standards and available dimensions.
Chemical Composition
ASTM B473 prints one chemistry window for this forged bar, holding nickel between 32.0% and 38.0% and copper between 3.0% and 4.0%. Moreover, niobium plus tantalum in this forged bar has to reach eight times the carbon content.
Meanwhile, the full composition table on the Alloy 20 material page carries every limit behind this forged bar.
Mechanical Properties
The floors in the table below come from the B473 bar table, which the B462 forging route carries across unchanged. Therefore, the ordered condition and the ruling section settle final acceptance of Alloy 20 forged bar.
| Condition | Tensile Strength, min. | Yield Strength (0.2%), min. | Elongation, min. | Reduction of Area, min. |
|---|---|---|---|---|
| Solution Annealed — UNS N08020 | ≥551 MPa (80 ksi) | ≥241 MPa (35 ksi) | 30% | 50% |
- ASTM B462 sets no hardness limit at all, so the forging route accepts or rejects on the tensile columns and on the reduction-of-area figure that comes with them. The 217 HB and 95 HRB figures that circulate for this grade belong to ASTM B463, which covers plate, sheet and strip, and they do not apply to a forged part. Besides, the document fixes a forging band rather than a strength step, which is why the reduction schedule and the test position belong on the enquiry. Therefore, we agree both before the press opens rather than after we measure the first forging.
Physical Properties
Published design data puts the density of this forged bar near 8.08 g/cm³ and its melting range between 1385 °C and 1443 °C. In addition, a modulus close to 193 GPa and a relative permeability near 1.004 leave this forged bar non-magnetic in service.
Therefore, the physical properties table on the Alloy 20 material page holds the conductivity, the resistivity and the expansion figures for this forged bar.
Heat Treatment
The water quench is the step that defines this Alloy 20 forged bar, because the section has to leave the stabilising anneal fast enough to keep carbide and sigma phases out of the grain boundaries. Moreover, the forging band finishes above 925 °C for a different reason: this grade risks incipient melting near 1200 °C.
| Condition | Typical Treatment |
|---|---|
| Stabilised Annealed | Held between 940 °C and 1010 °C, then water quenched, so the niobium carbide returns to solution |
| Hot-Worked | Forged between 1150 °C and 1230 °C, finishing above 925 °C because the section risks incipient melting near 1200 °C |
| Slow-Cool Caution | Passing slowly through 600–900 °C precipitates carbide and sigma phases, so the quench follows the anneal without delay |
| Strain Hardened | Cold drawn after the anneal, with the strength taken from the reduction rather than from a furnace |
| Cold-Forming Limit | Heavy cold forming sends the section back through the stabilising anneal before it enters service |
| Stress-Relief Caution | A relief pass inside the sensitising band costs corrosion resistance, so the alternative is settled before it is booked |
| Post-Weld Anneal | Most joints enter service as welded, because niobium at eight times the carbon content keeps the weld zone stable |
Standards
ASTM B462 is the forging document behind this forged bar, covering forged flanges, fittings, valves and pressure parts, issued by ASTM International. In addition, ASTM B472 covers the billet behind this forged bar.
| Standard | Product or Application |
|---|---|
| ASTM B462 / ASME SB462 | Forged flanges, fittings, valves and pressure parts |
| ASTM B472 / ASME SB472 | Forging billets and bars for reforging |
| ASTM B473 / ASME SB473 | Bar stock cut from the same stabilised heat |
Beyond that, the standards table on the Alloy 20 material page carries the European designations and the flat-product call-outs for this forged bar.
Dimensions
The table below lists the forged bar sizes we ship most often, while the route, the document and the lot size decide what else is possible. Please confirm your own size, section and length with the inquiry.
| Product Form | Typical Supply | Length |
|---|---|---|
| Forged Bar | Above 250 mm dia. | As forged or cut to length |
| Open-Die Forged Bar | Heavy sections to drawing | As forged |
| Forged Ring | Rolled or expanded rings to drawing | As forged |
| Forged Disc | Discs cut from a forged blank | As forged |
| Tube Sheet Blank | Blanks tested before the holes are drilled | As forged |
| Custom Forged Bar | To drawing, with the test position agreed | Custom |
ASTM B462 governs this route and it sets a forging band rather than a strength table, because the section has to finish above 925 C to avoid the incipient melting that begins near 1200 C. Therefore, we agree the reduction schedule, the anneal and the test position before the press opens instead of pricing a heavy section from a weight table alone.
Surface Finishes
The surface you order on this forged bar decides how the part feeds, seals and resists attack. Consequently, we settle the condition of this forged bar before the price goes out.
| Surface Condition | Typical Use |
|---|---|
| Hot-Worked | Hot-worked stock of this forged bar arrives with its rolling or forging skin intact. |
| Rough Turned | Turning removes the skin from this forged bar while the finishing cut stays with your shop. |
| Stabilised Annealed and Pickled | The stabilising anneal followed by acid descaling leaves this forged bar scale-free for acid plant work. |
In contrast, the surface finishes table on the Alloy 20 material page lists the further conditions open to this forged bar.
Related forms from the same heat cover Alloy 20 Hex Bar, Alloy 20 Hollow Bar and Alloy 20 Round Bar when your forged bar order needs them.
TECHNICAL DOCUMENTATION
Download Technical Datasheet
Get detailed information including specifications, standards, dimensions and material properties.
HOW TO START
Start Your Order in 6 Simple Steps
A single coordinator stays with your Alloy 20 forged bar enquiry from the first question to the loading bay. In addition, stock of this Alloy 20 forged bar leaves inside fifteen days, and a freshly annealed heat takes about thirty.
1
Give Us the Duty
Send the acid, its concentration and its temperature together with the size, quantity and standard this forged bar faces.
2
Settle the State
Then we lock the anneal cycle, the delivery condition and the tolerance band on this forged bar.
3
Read the Offer
Pricing for this forged bar comes back by size, quantity and destination port.
4
Sign off the Order
We need your written confirmation of the specification, the terms and the schedule for this forged bar.
5
Book the Witness Points
Next we schedule any third-party inspection or dimensional review of this forged bar before production starts.
6
Ship and Document
This forged bar reaches you with mill papers, a packing list and the certificate set.
CERTIFICATIONS & QUALITY DOCUMENTATION
Certifications & Quality Documentation
Our production and inspection processes are certified to international standards, and every delivery ships with EN 10204 3.1 mill test certificates.
ISO 9001:2015
Quality Management System
PED 2014/68/EU
Pressure Equipment Directive
ASTM / ASME
Material Standards Compliance
EN 10204 3.1
Mill Test Certificates
FAQ
Frequently Asked Questions
Which standard covers this Alloy 20 forged bar?
ASTM B473 and ASME SB473 cover this Alloy 20 forged bar, with the ASTM B462 forging route taking over above the bar ceiling.
Does this forged bar carry a hardness limit?
No. B473 prints tensile, yield, elongation and reduction of area with no hardness column, so we release this forged bar on those four figures.
Does this forged bar qualify for sour service?
Yes. NACE MR0175 covers this grade, and the condition it sets for your forged bar is what we document per heat.
Which filler metal suits this forged bar?
ER320LR bare wire to AWS A5.9 joins this forged bar, with E320LR covered electrodes to AWS A5.4 for manual work.
Why does this forged bar ship water quenched?
A slow pass through 600–900 °C precipitates carbide and sigma at the grain boundaries, so each forged bar heat leaves the anneal straight into the tank.
Does a weld in this forged bar need a post-weld anneal?
Usually not. Niobium at eight times the carbon content stabilises the matrix, so most forged bar joints stay serviceable as welded.
What is your MOQ for this forged bar?
Trial lengths of this forged bar are welcome, and one piece covers most stock sizes.
What are your trade terms for this forged bar?
Trade terms for this forged bar open on FOB, and EXW, CIF or DAP follow once we know the destination port.
What is the lead time for this forged bar?
Stock sizes of this forged bar ship in 7 to 15 days, while a made-to-order annealed heat needs about 30 days.
Do you provide EN 10204 3.1 or 3.2 certificates for this forged bar?
EN 10204 3.1 papers cover every heat of this forged bar, and we can arrange a 3.2 endorsement.
REQUEST FOR QUOTATION
Need A Custom Alloy Solution?
This Alloy 20 forged bar runs to B462, and the test coupon goes in before the press opens. Send the forged section, the finished weight and the drawing so we can quote.
Your Alloy 20 forged bar inquiry passes through the anneal, the finish and the document scope before any price goes out. We build to the signed sheet, and the full paper set travels with this forged bar.
