01
Alloy 20 Cold-Drawn Hex Bar
Drawn hexagons held close on across flats for automatic bar work.
Request Availability →Alloy 20 Hex Bar
Alloy 20 hex bar for valve trim, pipe plugs and multi-flat parts on acid service.
Copper at 3.0–4.0%
Copper holds the passive film of this Alloy 20 hex 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 hex 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 hex bar.
PRODUCT OVERVIEW
About Alloy 20 Hex Bar
Alloy 20 hex 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 hex bar through acid duty.
The B473 chemistry and mechanics follow hex bar of this grade, and the across-flats figure comes from your drawing. We supply this hex 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 hex bar consignment.
Meanwhile, the niobium addition is what lets a fabricated vessel of this hex bar go into service without a solution treatment after welding. The full chemistry window and the physical data behind this hex bar sit on our Alloy 20 material page, should you want to cross-reference them.
PRODUCT FEATURES
Key Features of Alloy 20 Hex Bar
Alloy 20 hex bar comes out of UNS N08020, the niobium-stabilised nickel-iron-chromium grade whose copper content carries it through sulfuric acid. We supply ASTM B473 hex bar as cold-drawn, ground and hot-finished hexagons for acid plant, pickling house liquor and tankhouse duty. Every Alloy 20 hex 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 hex bar keeps the passive film alive where a plain austenitic grade loses it.
01
Wide Acid Concentration Span
Specifically, the copper addition lets this hex 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 hex bar stable without a furnace pass.
03
Chloride Cracking Out of Reach
Therefore, nickel above a third of the analysis gives this hex bar immunity to chloride stress corrosion cracking.
04
Cold Work Sets the Strength
In addition, nothing in this hex 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 hex bar clears on chemistry and tensile results alone.
06
Sour Service Listed
Consequently, NACE MR0175 covers this hex bar at the condition that document names, and we document that condition per heat.
07
Essentially Non-Magnetic
Finally, the austenitic matrix keeps this hex bar non-magnetic for instrument and seal work.
08
WHY CHOOSE US
Why Choose Alloy 20
We never quote an Alloy 20 hex bar before the across-flats figure and the corner condition land on the drawing. In addition, we set the delivery state for this Alloy 20 hex bar in the same conversation.
01
Duty Read Before Pricing
We record the acid, its concentration and its temperature for your hex bar before proposing a delivery state.
02
Certificates Tied to the Heat
Specifically, each hex bar consignment carries EN 10204 3.1 papers, heat numbers and dimensional records.
03
One Route for Welders and Machinists
In addition, this hex 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 hex 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 hex bar runs from charge balancing through to the final pack. We log each stage behind this Alloy 20 hex bar against its own heat number.
01
Charge Weighing
We build the melt for this hex bar from weighed nickel, chromium and copper lots.
02
Melting and Refining
First, the charge for this hex bar melts and refines under AOD practice that brings carbon down to the ceiling.
03
Niobium Addition
Next, we add niobium so that this hex bar carries eight times the carbon content in the finished analysis.
04
Hot Reduction
Then, forging and rolling reduce the ingot to this hex bar section between 1230 °C and 925 °C.
05
Stabilising Anneal
After that, we hold this hex bar between 927 °C and 1010 °C so the niobium carbide goes back into solution.
06
Water Quenching
We then drop this hex 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 hex bar to the ordered size and surface.
08
Testing and Release
Finally, we clear this hex 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 hex bar. Besides, we quote this Alloy 20 hex bar through our bar and rod program.
20,000+ m²
Factory Area
Hot working, annealing, quenching and finishing lines behind the hex bar share this site.
50+
Production Machines
Units for hot working, annealing, quenching and grinding of this hex bar.
600 Tons
Monthly Capacity
Hex bar tonnage across stock lots and bespoke heats.
30+
Technical Engineers
Metallurgists who write the anneal and quench plan that this hex bar follows.
30+ Countries
Export Reach
In addition, sealed export packing sends this hex bar to buyers on five continents.
QUALITY ASSURANCE
Strict Quality Control From Production To Delivery
Nothing leaves until the heat behind your Alloy 20 hex bar clears our ISO 9001 route. In addition, the checks on this Alloy 20 hex bar follow the requirements the order names.
01
Heat Identification
We match the grade and heat number on this hex bar to your purchase order before anything leaves the yard.
02
Chemistry Verification
Specifically, copper, nickel and niobium in this hex bar go against the B473 table for your lot.
03
Tensile Verification
In addition, every heat of this hex bar carries reported tensile, yield and reduction-of-area values measured against the B473 floor.
04
Quench Record Referenced
The cooling record behind this hex 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 hex bar from your drawing rather than a stock list. In addition, this list covers the deliveries ordered most often for this Alloy 20 hex bar.
02
Alloy 20 Ground Hex Bar
Hexagons ground for a narrower across-flats band and a smoother skin.
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03
Alloy 20 Hot-Finished Hex Bar
Larger hexagons that keep the rolling skin for parts machined all over.
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04
Alloy 20 Machined Hex Bar
Hexagons milled to an across-flats figure a stock list cannot carry.
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05
Alloy 20 Custom Hex Bar
Corner radius, length and finish agreed with your shop.
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APPLICATIONS
Engineered For Demanding Industries
Alloy 20 hex 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 hex bar serves.
Discuss Your Application →
01
Alloy 20 Valve Packing Nuts
Nuts turned from hex stock for glands on acid-handling valves.
02
Alloy 20 Acid Line Pipe Plugs
Plugs machined from hex bar for lines that open for inspection.
03
Alloy 20 Multi-Flat Valve Trim
Trim parts carrying several flats machined from one hex length.
04
Alloy 20 Column Internals Fasteners
Nuts and caps that hold packing inside an acid absorption column.
05
Alloy 20 Sight Glass Fittings
Fittings machined from hex stock for sight glasses on acid service.
06
Alloy 20 Pump Casing Nipples
Nipples turned from hex bar for casings that meet dilute acid.
07
Alloy 20 Drain and Vent Plugs
Plugs machined from hex stock for vessel drains opened often.
08
Alloy 20 Hex Coupling Nuts
Couplings for threaded rod where the joint sits in an acid atmosphere.
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 hex bar, holding nickel between 32.0% and 38.0% and copper between 3.0% and 4.0%. Moreover, niobium plus tantalum in this hex 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 hex bar.
Mechanical Properties
The floors in the table below come from the B473 bar table for UNS N08020. Therefore, the ordered condition and the ruling section settle final acceptance of Alloy 20 hex bar.
| Condition | Tensile Strength, min. | Yield Strength (0.2%), min. | Elongation, min. | Reduction of Area, min. |
|---|---|---|---|---|
| Stabilised Annealed — UNS N08020 | ≥551 MPa (80 ksi) | ≥241 MPa (35 ksi) | 30% | 50% |
| Strain Hardened, up to 2 in (50.8 mm) | ≥620 MPa (90 ksi) | ≥415 MPa (60 ksi) | 15% | 40% |
- ASTM B473 prints four columns and no hardness column against UNS N08020, so release rests on chemistry and tensile results rather than on an indenter reading. 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 bar. Consequently, we quote the annealed and strain-hardened results and leave hardness out of the acceptance sheet.
Physical Properties
Published design data puts the density of this hex 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 hex 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 hex bar.
Heat Treatment
The water quench is the step that defines this Alloy 20 hex 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 927 °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 B473 is the bar, rod and wire document behind this hex bar, issued by ASTM International. Moreover, ASTM B462 covers forged sections of this hex bar while ASTM B472 governs the billet it is reforged from.
| Standard | Product or Application |
|---|---|
| ASTM B473 / ASME SB473 | Bar, rod and wire, stabilised annealed |
| ASTM B462 / ASME SB462 | Forged bar, forging stock, flanges and fittings |
| NACE MR0175 / ISO 15156-3 | Sour service, at the condition that document sets |
Beyond that, the standards table on the Alloy 20 material page carries the European designations and the flat-product call-outs for this hex bar.
Dimensions
The table below lists the hex 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 |
|---|---|---|
| Hex Bar | 8-70 mm across flats | Cut to length or random |
| Cold-Drawn Hex Bar | 8-50 mm across flats | Cut to length |
| Ground Hex Bar | 10-60 mm across flats | Cut to length |
| Hot-Finished Hex Bar | 20-70 mm across flats | Cut to length or random |
| Machined Hex Bar | To drawing across flats | Cut to length |
| Custom Hex Bar | Length and corner condition to order | Custom |
ASTM B473 names hexagons inside its bar scope, so the chemistry and the mechanical floors follow that document while the across-flats figure comes off your drawing. Meanwhile, we settle the corner condition and the across-flats tolerance when the order opens.
Surface Finishes
The surface you order on this hex bar decides how the part feeds, seals and resists attack. Consequently, we settle the condition of this hex bar before the price goes out.
| Surface Condition | Typical Use |
|---|---|
| Cold Drawn | Drawing brings this hex bar to a close diameter while the pass lifts proof stress into the strain-hardened band. |
| Centreless Ground | Grinding sets the diameter, the roundness and the straightness of this hex bar in one pass. |
| Polished | A finer surface on this hex bar for visible and product-contact parts. |
In contrast, the surface finishes table on the Alloy 20 material page lists the further conditions open to this hex bar.
Related forms from the same heat cover Alloy 20 Hollow Bar, Alloy 20 Round Bar and Alloy 20 Welding Wire when your hex 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 hex bar enquiry from the first question to the loading bay. In addition, stock of this Alloy 20 hex 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 hex bar faces.
2
Settle the State
Then we lock the anneal cycle, the delivery condition and the tolerance band on this hex bar.
3
Read the Offer
Pricing for this hex 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 hex bar.
5
Book the Witness Points
Next we schedule any third-party inspection or dimensional review of this hex bar before production starts.
6
Ship and Document
This hex 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 hex bar?
ASTM B473 and ASME SB473 cover this Alloy 20 hex bar, with the ASTM B462 forging route taking over above the bar ceiling.
Does this hex bar carry a hardness limit?
No. B473 prints tensile, yield, elongation and reduction of area with no hardness column, so we release this hex bar on those four figures.
Does this hex bar qualify for sour service?
Yes. NACE MR0175 covers this grade, and the condition it sets for your hex bar is what we document per heat.
Which filler metal suits this hex bar?
ER320LR bare wire to AWS A5.9 joins this hex bar, with E320LR covered electrodes to AWS A5.4 for manual work.
Why does this hex bar ship water quenched?
A slow pass through 600–900 °C precipitates carbide and sigma at the grain boundaries, so each hex bar heat leaves the anneal straight into the tank.
Does a weld in this hex bar need a post-weld anneal?
Usually not. Niobium at eight times the carbon content stabilises the matrix, so most hex bar joints stay serviceable as welded.
What is your MOQ for this hex bar?
Trial lengths of this hex bar are welcome, and one piece covers most stock sizes.
What are your trade terms for this hex bar?
Trade terms for this hex bar open on FOB, and EXW, CIF or DAP follow once we know the destination port.
What is the lead time for this hex bar?
Stock sizes of this hex 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 hex bar?
EN 10204 3.1 papers cover every heat of this hex bar, and we can arrange a 3.2 endorsement.
REQUEST FOR QUOTATION
Need A Custom Alloy Solution?
We fix across flats and the corner condition on an Alloy 20 hex bar before the offer goes out. Give us the A/F size and the delivery state, and we will price this Alloy 20 hex bar.
Your hex 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 hex bar.
