BS 1501 622B

Although no longer a currently specified steel grade, 622B is still referred to by our customers and as a consequence we have included information here for cross referencing purposes.
622B is a chrome moly pressure vessel grade steel for use in elevated temperature service. The BS standard has now been superseded with the euro norm standard EN10028. The material benefits from greater tensile and yield strength and has good weldability characteristics. The steel is used commonly in the fabrication of industrial boilers and pressurised tanks found throughout the oil gas and petrochemical industry.
Please refer to the technical information for Grade 622B steel below.
 

Mechanical Properties of BS 1501 622B

GradeThickness (mm)Tensile StrenthYield StrengthElongation (A)
620B<100515/69031016
>100 <150500/67028516

Chemical Composition of BS 1501 622B

 %
Carbon (C)0.09/0.15
Silicon (Si)0.50
Manganese (Mn)0.30/0.60
Phosphorus (P)0.025
Sulphur (S)0.015
Chromium (Cr)2.00/2.50
Molybdenum (Mo)0.90/1.10
Nickel (Ni)0.30
Others0.32