ALLOY B2 (Hastelloy B2)

Corrosion Resistance
Chemical Composition
Mechanical properties
International Standard Comparision Chart Stock Form And Sizes
Round Bars
Hex Bars
Nuts And Washers
Spring Washer
Hex Bolt
Stud Bolt
Sourceable Materials


ALLOY B2 is a corrosion-resistant, solid-solution Ni-Mo alloy.

  • controlled chemistry with a minimum iron and chromium content to retard the formation of ordered -phase Ni4Mo
  • significant corrosion resistance to reducing environments
  • excellent resistance to medium-concentrated sulphuric acid and a number of non-oxidizing acids
  • good resistance to chloride-induced stress-corrosion cracking (SCC)
  • good resistance to a wide range of organic acids

Stock Form and Sizes

※ ◆1000㎜ ◎2000㎜ ▲3000㎜ ■3500㎜ ●4000㎜ ★2500㎜~3990㎜

Round barsSpecification: ASTM B335/B564※ ASME SB335/SB564※ ※B564/SB564 Apply to Forged Bar Only
size 1〜13
1.2 1.6 2 2.6 3 3.5 4 4.4 5 5.3 6 7.1 8 8.95 10 12 13
size 16〜50
16 18 19 20 22 24 25 28 30 32 35 36 38 40 42 45 50
size 55〜135
55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 133 135
size 140〜330
140 145 150 155 160 165 170 180 190 200 210 220 230 250 280 300 330
size 350

Sourceable Ex-Stock Material for other Forms from Distributors World-Wide

Equivalent Round Bars Plate Pipe/Tube Welding Rod & Wire
Min Max Min Max
HastelloyB2/B3 10~203.2 0.53~31.8 ×

*○: Various sizes available in stock. △: Only limited sizes available in stock. ☆: Please contact us for more details.
*We can supply materials and products that comply with various standards including ASTM, ASME, AMS, and NACE standards. Please contact us for more details.

Corrosion resistance

The extremely low carbon and silicon content of Alloy B2 reduces precipitation of carbides and other phases in the heat-affected zone of welds and ensures adequate corrosion resistance even in the welded condition.
Alloy B2 exhibits excellent corrosion resistance in aggressive reducing media such as hydrochloric acid in a wide range of temperatures and concentrations, as well as in medium-concentrated sulphuric acid even with limited chloride contamination. It can also be used in acetic and phosphoric acids. Optimum corrosion resistance can be obtained only if the material is in the correct metallurgical condition and exibits a clean structure.


ALLOYB2is used in a wide range of applications in the chemical process industry, especially for processes involving sulphuric, hydrochloric, phosphoric and acetic acid.

Chemical composition

  Ni Cr Fe C Mn Si Cu Mo Co P S
min bal. 0.4 1.6         26.0      
max 1.0 2.0 0.01 1.0 0.08 0.5 30.0 1.0 0.02 0.010

※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical properties(Round Bar)

  Condition Yield Strength(Mpa) Tensile Strength(Mpa) Elongation(%) Hardness(HB)
ASTM Min Value Solution Annealed 350 760 40  
Typical Values at RT Solution Annealed 411 892 60 185

Above standard values and typical values of Round Bar.
Please contact us with any questions about reference or value of plate and pipe.
※The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

International Standard Comparison Chart

  Material Round Bars Plates/Sheets Pipe/Tube
Seamless Welded
B335 B333 B622 B619/B626
ASME SB335 SB333 SB622 SB619/SB626
JIS NW0665 H4553 H4551 H4552  
DIN 2.4617 17752 17750 17751 17751
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