Hastelloy B Round Bar
➡️ Alloy B | UNS N10001 | EN 2.4800 | EN 2.4810
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Nickel Alloy
UNS Number:
N10001
Wr. No.:
2.4800
MTC Available:
EN 10204 3.1
Product Description for Hastelloy B Round Bar
Hastelloy Alloy B Round Bar is made from the original nickel-molybdenum alloy, UNS N10001, known in Germany as 2.4800 (NiMo30). Bar is covered by ASTM B335 and ASME SB335 in the solution annealed condition. Hastelloy is a trademark of Haynes International, and the same chemistry is sold under other mill names.
The alloy was developed in the 1920s for one hard job: handling hydrochloric acid. With 26–30% molybdenum and 4–6% iron in a nickel base, it resists the acid at every concentration up to boiling, as well as hydrogen chloride gas and reducing sulfuric, phosphoric and acetic acid.
Alloy B has two weak points that shaped later grades. First, oxidising species such as ferric ions, cupric ions or air in the acid destroy its passive behaviour and cause fast attack. Second, its carbon and silicon form grain-boundary carbides during welding, so the heat-affected zone can corrode unless the part is solution annealed again.
These limits led to Alloy B-2 and then B-3, which now cover most new equipment. Alloy B bar is still ordered when a legacy drawing, an approved spare-parts list or an old pump or valve design calls for UNS N10001 by name.
Bar is non-magnetic and is offered peeled, turned or ground, cut to length, with EN 10204 3.1 certification. Common parts are pump shafts, impellers, valve stems, bolts and nozzles in hydrochloric acid, chlorinated organics and other reducing-acid service in chemical plants.
Stock is held in common metric and inch diameters, while odd sizes can be made from forged or rolled billet. Buyers replacing old parts should compare the original drawing with current ASTM B335 limits before placing the order.
Common Applications of Hastelloy B Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for Hastelloy B Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N10001
ASTM / ASME
USA
ASTM B335 / ASME SB335
EN
Europe
EN 2.4800 / EN 2.4810
GB
China
NS3201 / NS321
Technical Specification for Hastelloy B Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
B / UNS N10001 / 2.4800
-
Standard
ASTM B335 / ASME SB335
-
Product Form
Round bar / rod
-
Diameter (supply range)
6–250
mm
Length (random)
1–6
m
Manufacturing Process
Hot rolled, forged, extruded or cold drawn
-
Surface Finish
Descaled, pickled, peeled, turned, ground or bright
-
Heat Treatment / Delivery Condition
Solution annealed
-
Tolerance Standard
Per ASTM B335 tolerance tables
-
Density
9.24
g/cm³
Melting Range
1300–1355
°C
Thermal Conductivity at 20°C
11.1
W/m·K
Coefficient of Thermal Expansion 20–100°C
10.3
µm/m·K
Specific Heat at 20°C
381
J/kg·K
Electrical Resistivity at 20°C
1.35
µΩ·m
Modulus of Elasticity at 20°C
205
GPa
Magnetic Properties
Non-magnetic
-
Testing / Inspection
Chemical analysis, tensile, hardness, dimensional, UT and PMI on request
-
Certification
EN 10204 3.1 mill test certificate (3.2 on request)
-
Technical Specifications
Get the key technical specifications for Hastelloy B Round Bar
ASTM B335 is the governing bar specification for UNS N10001, with ASME SB335 used when the part goes into code pressure equipment. The standard covers rod and bar in the solution annealed condition, and it sets chemistry, tensile tests by size and dimensional tolerances for cold-finished and hot-finished bar.
Solution annealing for Alloy B is done at about 1065–1080°C with a rapid water quench. This puts carbides back into solution and restores full corrosion resistance. Any hot forming, welding or stress relief done later can undo this, so fabricators should plan a final anneal for welded parts.
Density is about 9.2 g/cm³, which is higher than most stainless steels and should be allowed for in weight and cost estimates. The physical values in the table are producer reference data rather than specification limits.
Testing to ASTM B335 covers heat chemistry, tensile tests and dimensions. Because the alloy is often used in severe acid, buyers commonly add ultrasonic testing, PMI on each bar and an intergranular corrosion check when the application is critical.
Hot-finished Alloy B bar comes with a machining allowance, while cold-finished bar is held to closer diameter limits for direct use in shafts and studs.
Chemical Composition for Hastelloy B Round Bar
Element
Symbol
Min
Max
Unit
Molybdenum
Mo
26.0
30.0
%
Iron
Fe
4.0
6.0
%
Chromium
Cr
-
1.0
%
Carbon
C
-
0.05
%
Cobalt
Co
-
1.0
%
Manganese
Mn
-
1.0
%
Silicon
Si
-
1.0
%
Vanadium
V
0.2
0.4
%
Phosphorus
P
-
0.04
%
Sulfur
S
-
0.03
%
Nickel
Ni
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for Hastelloy B Round Bar
The composition table follows ASTM B335 for UNS N10001. The alloy is a simple two-part system: nickel and molybdenum make up almost all of it, with iron and vanadium as deliberate minor additions.
Molybdenum at 26–30% is the element that gives the alloy its value. In reducing acids, molybdenum raises the corrosion resistance of nickel far above any chromium-bearing alloy, which is why Alloy B outperforms stainless steel and even Ni-Cr-Mo grades in hot hydrochloric acid.
Iron at 4–6% and vanadium at 0.2–0.4% were part of the original melting practice and help hot workability. However, the iron level also speeds up the formation of unwanted phases during heating, one reason later grades cut it back.
Carbon up to 0.05% and silicon up to 1.0% are the main weakness. During welding they form molybdenum-rich carbides at grain boundaries, leaving thin zones that the acid can attack. B-2 cut carbon to 0.02% and silicon to 0.10% to solve this.
Chromium is held below 1.0% because it adds little in reducing media. Cobalt, manganese, phosphorus and sulfur are limited as residuals.
Heat analysis appears on the mill certificate, and a check analysis on each lot can be ordered when the part is critical.
Mechanical Properties for Hastelloy B Round Bar
Mechanical Property
Value
Unit
Tensile Strength, 7.94–38.1 mm (ASTM B335, annealed)
≥ 795
MPa
Tensile Strength, over 38.1–88.9 mm (ASTM B335, annealed)
≥ 690
MPa
Yield Strength 0.2% (ASTM B335, all sizes)
≥ 315
MPa
Elongation, 7.94–38.1 mm (ASTM B335)
≥ 35
%
Elongation, over 38.1–88.9 mm (ASTM B335)
≥ 30
%
Mechanical Properties
Check the key mechanical properties and performance requirements of Hastelloy B Round Bar
ASTM B335 sets minimum tensile properties for N10001 bar in the solution annealed condition, split by size. Bar from 7.94 mm to 38.1 mm must reach at least 795 MPa tensile strength and 35% elongation. Heavier bar from over 38.1 mm to 88.9 mm must reach at least 690 MPa and 30%. Yield strength of at least 315 MPa applies to all sizes.
The lower values for thicker bar reflect the coarser grain and lower hot reduction in large sections. Designers who use heavy bar for shafts or flanges should base calculations on the minimum for the actual diameter.
The alloy work hardens quickly, so machining feeds and depths of cut should stay constant to avoid cutting a hardened skin. Cold working raises strength but also lowers corrosion resistance and ductility, so parts that are heavily cold formed may need a final anneal.
At high service temperatures the alloy loses ductility if held in the range of about 550–850°C, which is why it is used mainly for aqueous acid service rather than hot structural parts. Actual test results for each heat should be read from the EN 10204 3.1 certificate.
Dimension / Sizes for Hastelloy B Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
6–250
mm
Standard Length (random)
1–6
m
Custom / Cut-to-Length
Available on request
-
Diameter Tolerance
Per ASTM B335 tolerance tables
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per ASTM B335 or as agreed
-
End Condition
Saw cut square, chamfered or as ordered
-
Surface Finish
Hot finished, descaled, pickled, peeled, turned, centreless ground or cold drawn bright
-
Diameter Range Covered by Standard
7.94–88.9 (ASTM B335 scope, larger diameters supplied to agreed specification)
mm
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Hastelloy B Round Bar
Pricing for Hastelloy B Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Hastelloy B Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
What is Hastelloy Alloy B Round Bar?
Should I choose Hastelloy B or Hastelloy B-3?
What standard covers Hastelloy B bar?
Can Hastelloy B be welded?
What media attack Hastelloy B?
What sizes of Hastelloy B bar are available?
Why is Hastelloy B harder to buy than B-3?
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