Hastelloy B3 Round Bar
➡️ Alloy B3 | UNS N10675 | EN 2.4600
➡️ 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:
N10675
Wr. No.:
2.4600
MTC Available:
EN 10204 3.1
Product Description for Hastelloy B3 Round Bar
Hastelloy Alloy B3 Round Bar is made from nickel-molybdenum alloy UNS N10675, listed in Germany as 2.4600 (NiMo29Cr). It is supplied to ASTM B335 and ASME SB335 in the solution annealed condition, and it is the current member of the Alloy B family.
B3 was introduced in the 1990s to fix the thermal instability of B-2. Instead of cutting minor elements to the lowest possible level, the designers set small, balanced amounts of chromium, iron, manganese and tungsten. These elements disturb the atomic ordering that makes B-2 brittle. As a result, B3 can stay in the 600–800°C range many times longer than B-2 before losing ductility.
This gives real benefits in the workshop. Hot forming, heavy welding, weld repair and slow cooling of thick sections are far less likely to cause cracking. Carbon is held at 0.01% maximum, so the heat-affected zone stays free of carbides and welded parts are normally used as-welded.
The corrosion resistance matches the family. B3 resists hydrochloric acid at all concentrations and temperatures, hydrogen chloride, hydrobromic acid and reducing sulfuric, acetic and formic acid. It also resists chloride stress corrosion cracking. It must not be used where oxidising contaminants such as ferric or cupric ions, nitric acid or oxygen are present.
Bar is non-magnetic and is supplied peeled, turned or ground, cut to length, with EN 10204 3.1 certification. It is used for agitator shafts, pump parts, valve stems, fasteners, flanges and fittings in chemical, pharmaceutical and acid regeneration plants.
Its better thermal stability also gives more margin during hot forming and multipass welding. This lowers the risk of cracking in thick sections, nozzles and complex fittings made from bar.
Common Applications of Hastelloy B3 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 Alloy B3 Round Bar
Standard
Country / Region
Grade
ASTM / ASME
USA
ASTM B335 / ASME SB335
UNS
USA
UNS N10675
DIN / EN
Europe
EN 2.4600 (NiMo29Cr)
GB
China
NS3303 / NS3203 / NS323
JIS
Japan
JIS N10675 / JIS NW10675
KS
South Korea
KS N10675
BS
UK
BS NA 45
AFNOR
France
AFNOR NU-30
ISO
International (ISO)
ISO NW0675
Technical Specification for Hastelloy B3 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
B3 / UNS N10675 / 2.4600
-
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
9.22
g/cm³
Melting Range
1370–1418
°C
Thermal Conductivity at 20°C
11.2
W/m·K
Coefficient of Thermal Expansion 20–100°C
10.6
µm/m·K
Specific Heat at 20°C
373
J/kg·K
Electrical Resistivity at 20°C
1.37
µΩ·m
Modulus of Elasticity at 20°C
216
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 B3 Round Bar
UNS N10675 bar is ordered to ASTM B335, with ASME SB335 for code work. B3 is listed in ASME Section II-D, so it can be used in Section VIII pressure vessels within the permitted temperature limits.
Mills solution anneal B3 at about 1065°C and quench in water. Although B3 is far more tolerant than B-2, a fast cool is still good practice to keep the structure fully disordered. Fabricators who need to heat treat after forming should use the same solution anneal rather than a lower stress-relief cycle.
Density is about 9.2 g/cm³, and thermal expansion is low for a nickel alloy, which helps when B3 parts are joined to steel. Thermal and electrical values listed for B3 come from producer data sheets.
Standard tests under ASTM B335 are heat chemistry, tension tests and dimensional checks. For critical parts, many buyers also order ultrasonic testing, PMI on each bar and a thermal stability check, in which a sample is aged in the ordering range and then tested for ductility. This confirms that the bar has the balanced chemistry that makes B3 stable.
Heat numbers are marked on each B3 bar for full traceability.
Chemical Composition for Hastelloy B3 Round Bar
Element
Symbol
Min
Max
Unit
Molybdenum
Mo
27.0
32.0
%
Chromium
Cr
1.0
3.0
%
Iron
Fe
1.0
3.0
%
Nickel
Ni
65.0
-
%
Tungsten
W
-
3.0
%
Cobalt
Co
-
3.0
%
Manganese
Mn
-
3.0
%
Aluminium
Al
-
0.50
%
Titanium
Ti
-
0.20
%
Carbon
C
-
0.01
%
Silicon
Si
-
0.10
%
Niobium
Nb
-
0.20
%
Vanadium
V
-
0.20
%
Copper
Cu
-
0.20
%
Tantalum
Ta
-
0.20
%
Zirconium
Zr
-
0.10
%
Nickel + Molybdenum
Ni+Mo
94.0
98.0
%
Phosphorus
P
-
0.030
%
Sulfur
S
-
0.010
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy B3 Round Bar
The composition table follows ASTM B335 for UNS N10675. Molybdenum is set at 27–32%, slightly higher than in B-2, to keep corrosion resistance in reducing acids at the top of the Ni-Mo family.
The main feature of the table is the set of small minimums and maximums. Chromium and iron are both held at 1.0–3.0%, and tungsten, cobalt and manganese are each allowed up to 3.0%. Nickel must be at least 65%, and nickel plus molybdenum must total 94–98%. This window keeps enough foreign atoms in the lattice to slow ordering, but not so many that they harm acid resistance.
Carbon at 0.01% maximum and silicon at 0.10% maximum prevent carbide and silicide formation at grain boundaries during welding. Aluminium, titanium, niobium, vanadium, copper, tantalum and zirconium are each capped at low levels, with zirconium limited to 0.10%.
Phosphorus at 0.030% and sulfur at 0.010% maximum support hot workability and weld soundness.
The certificate should show chromium and iron within range, because these confirm the bar is B3 and not B2.
The standard also caps aluminium, titanium, vanadium and copper at low levels so that the matrix stays stable, clean and easy to weld.
Mechanical Properties for Hastelloy B3 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (ASTM B335, annealed)
≥ 760
MPa
Yield Strength 0.2% (ASTM B335)
≥ 350
MPa
Elongation (ASTM B335)
≥ 40
%
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy B3 Round Bar
ASTM B335 requires solution annealed N10675 bar to reach at least 760 MPa tensile strength, 350 MPa yield strength and 40% elongation. These minimums are the same as for B-2, so strength-based designs can move between the two grades without changes.
The real mechanical difference shows after heating. When both alloys are held in the ordering range, B-2 can lose most of its elongation within an hour, while B3 keeps useful ductility for many hours. This margin is what makes B3 safer for thick weldments, multi-pass repairs and hot-formed heads or fittings.
Like other nickel alloys, B3 work hardens during machining and cold forming. Tools must stay sharp, feeds should be steady and the tool should not rub. Heavy cold work raises strength but may reduce corrosion resistance, so severely formed parts may need a final anneal.
For design at elevated temperature, allowable stresses should be taken from ASME Section II-D. Test results for each heat and lot are reported on the EN 10204 3.1 certificate.
Tests are done at room temperature on specimens cut as the standard directs. Design data for higher temperatures should come from ASME Section II-D or producer curves, not from certificate values.
Dimension / Sizes for Hastelloy B3 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 Alloy B3 Round Bar
Pricing for Hastelloy B3 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
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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 B3 Round Bar?
What makes Hastelloy B3 better than B-2?
Which standards cover Hastelloy B3 bar?
How is Hastelloy B3 welded?
Can Hastelloy B3 handle oxidising acids?
What sizes and finishes are available for Hastelloy B3 bar?
Is Hastelloy B3 expensive?
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