Hastelloy B2 Round Bar
➡️ ALLOY B2 | UNS N10665 | EN 2.4617 | ASTM B335
➡️ 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:
N10665
Wr. No.:
2.4617
MTC Available:
EN 10204 3.1
Product Description for Hastelloy B2 Round Bar
Hastelloy Alloy B2 Round Bar is made from nickel-molybdenum alloy UNS N10665, known in Germany as 2.4617 (NiMo28). Bar is supplied to ASTM B335 and ASME SB335 in the solution annealed condition.
B2 was introduced in the 1970s to fix the weld problem of the original Alloy B. By cutting carbon to 0.02% maximum, silicon to 0.10% maximum and iron to 2.0% maximum, the makers stopped carbide formation in the heat-affected zone. For most reducing-acid duties, welded B2 can go straight into service without a post-weld anneal.
Its corrosion resistance matches the family. It handles hydrochloric acid of every strength up to boiling, hydrogen chloride gas, hydrobromic acid and reducing sulfuric acid. Like all Ni-Mo alloys, it fails in oxidising conditions, so ferric salts, cupric salts, nitric acid and aeration must be kept out.
The lower iron that helped weldability had a side effect. When B2 passes through about 600–800°C, ordered Ni4Mo phase can form within minutes, making the metal brittle. Hot forming, stress relief and slow cooling after annealing can crack parts. This thermal sensitivity is why B-3 was developed.
B2 bar remains in demand for spares and for plants that have qualified procedures for it. It is non-magnetic and supplied turned, peeled or ground with EN 10204 3.1 certification. Common parts are agitator shafts, pump shafts, valve trim, bolting and nozzles in hydrochloric acid, acetic acid and other reducing chemical service.
Because B2 reacts quickly to heat between about 600°C and 800°C, suppliers anneal bar with care and quench it fast. Fabricators should avoid long stress-relief cycles and keep interpass temperature low when welding shafts or fittings.
Common Applications of Hastelloy B2 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 B2 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N10665
ASTM / ASME
USA
ASTM B335 / ASME SB335
EN
Europe
EN 2.4617
GB/T 15007
China
GB NS322
JIS
Japan
JIS H4553
KS
South Korea
KS D 5575
AFNOR
France
NU-30M
GOST
Russia
ХН65МВУ / ЭП760
ISO
International
ISO NW0665
Technical Specification for Hastelloy B2 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
B2 / UNS N10665 / 2.4617
-
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
1302–1368
°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
373
J/kg·K
Electrical Resistivity at 20°C
1.37
µΩ·m
Modulus of Elasticity at 20°C
217
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 B2 Round Bar
ASTM B335 covers UNS N10665 rod and bar, and ASME SB335 is used for pressure-retaining parts. B2 has allowable stresses in ASME Section II-D, which lets it be used in Section VIII vessels within the listed temperature range.
The delivery condition is solution annealed at about 1065°C followed by a fast water quench. Cooling speed matters more for B2 than for most alloys, because slow cooling through the 600–800°C range can start ordering. Mills control this closely, and buyers who heat treat parts themselves must copy the same fast quench.
Density is about 9.2 g/cm³, and the alloy has low thermal expansion for a nickel alloy. The table shows producer reference values for physical properties, not required limits.
Standard tests include heat chemistry, tension tests and dimensional checks. For critical service, buyers may add ultrasonic testing of each bar, PMI to confirm molybdenum level, and a room-temperature bend or hardness check after a simulated fabrication heat cycle to confirm the bar has not begun to order.
Cold-finished B2 bar is held to tight diameter limits for pump and valve shafts, while hot-finished bar carries a larger allowance and is rough turned before final machining.
Chemical Composition for Hastelloy B2 Round Bar
Element
Symbol
Min
Max
Unit
Molybdenum
Mo
26.0
30.0
%
Iron
Fe
-
2.0
%
Chromium
Cr
-
1.0
%
Carbon
C
-
0.02
%
Cobalt
Co
-
1.0
%
Manganese
Mn
-
1.0
%
Silicon
Si
-
0.10
%
Phosphorus
P
-
0.04
%
Sulfur
S
-
0.03
%
Nickel
Ni
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for Hastelloy B2 Round Bar
The composition table lists ASTM B335 limits for UNS N10665. Nickel forms the balance and molybdenum is set at 26–30%, the same band as Alloy B, so resistance to reducing acids is kept.
The key changes are in the minor elements. Carbon is capped at 0.02% and silicon at 0.10%, which stops the grain-boundary carbides and silicides that made welded Alloy B vulnerable. Iron is cut to 2.0% maximum and vanadium is no longer added.
These cuts gave B2 its weldability, but they also made the matrix more prone to ordering. With little iron or chromium to disturb the atomic arrangement, nickel and molybdenum atoms quickly line up into Ni4Mo and Ni3Mo phases when heated in the danger range. These phases raise hardness and cut ductility sharply.
Chromium is limited to 1.0% and cobalt to 1.0%. Manganese, phosphorus and sulfur are controlled as residuals to support hot working and cleanliness.
The certificate should show carbon and silicon clearly, as these confirm the bar is B2 rather than the older Alloy B.
Low iron and chromium let the Ni4Mo ordered phase form if the metal is held near 700°C, and this reduces ductility within a short time.
Mechanical Properties for Hastelloy B2 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 Hastelloy B2 Round Bar
ASTM B335 requires solution annealed N10665 bar to reach at least 760 MPa tensile strength, 350 MPa yield strength and 40% elongation. These values apply to the tested size range of the standard.
The high elongation shows how ductile B2 is when it has been annealed and quenched correctly. That ductility can be lost very quickly. Exposure of less than an hour in the 600–800°C band can start ordering, and longer holds can drop elongation to a few percent. Parts that crack during forming or welding are often traced to this effect.
Because of this, fabricators should avoid slow heating and cooling, stress-relief treatments in the danger zone and repeated weld repairs on the same spot. Any hot forming should be followed by a full solution anneal and water quench.
Hardness is not a required property in ASTM B335, but a rise in hardness after fabrication can be a useful warning sign of ordering. Tensile results for each heat should be checked on the EN 10204 3.1 certificate before the bar is released to production.
Hardness climbs sharply once ordering starts, so a simple hardness check is a useful screen on repaired or reheated B2 parts.
Dimension / Sizes for Hastelloy B2 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 B2 Round Bar
Pricing for Hastelloy B2 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 B2 Round Bar?
Should I choose Hastelloy B2 or B3?
Why can Hastelloy B2 crack during fabrication?
How is Hastelloy B2 welded?
What chemicals should not contact Hastelloy B2?
Can Hastelloy B2 bar be supplied cut to length?
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