Hastelloy B-2 material introduction

 

Hastelloy B-2 material introduction

Hastelloy B2 is a solid solution strengthened nickel-molybdenum alloy with remarkable tolerance to reducing environments such as hydrogen chloride gas, sulfuric acid, acetic acid and phosphoric acid. Molybdenum is the main alloying element that provides significant corrosion resistance to reducing environments. This nickel-steel alloy can be used in the welded state because it prevents the formation of grain boundary carbide precipitations in the welded heat-affected zone.

Hardwood B2 chemical composition

Alloy	%	Ni	Cr	Fe	C	Mn	Si	Cu	Mo	Co	P	S
HastelloyB-2	Minimum value	Margin	0.4	1.6	-	-	-	-	26	-	-	-
Maximum value	0.7	2.0	0.01	1.0	0.08	0.5	30	1.0	0.020	0.010

Physical properties of Harrington B2

Density	9.2g/cm3
Fusing point	1330～1380 ℃

The minimum mechanical properties of an alloy at room temperature

Status	Tensile strength Rm N/mm	Yield strength RP0.2 N/mm	Rate of elongation A5 %
Solid solution	690	310	40

Hastelloy B2 material properties

Control the minimum content of iron and chromium elements to prevent the formation of β-phase Ni4Mo

Excellent corrosion resistance to reducing environments

Excellent resistance to moderate concentrations of sulfuric acid and many non-oxidizing acids

Excellent resistance to chloride ion reduction stress corrosion cracking (SCC)

Excellent resistance to various organic acids

Hastelloy B-2 has a face-centered cubic lattice structure.

Hastelloy B2 application area

It is widely used in chemical, petrochemical, energy manufacturing and pollution control fields, especially in sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid and other industries. It is not recommended for use in the presence of ferric and copper salts, as these salts will quickly cause corrosion damage. When hydrochloric acid comes into contact with iron and copper, it reacts with them to form ferric and copper salts.