wcb means 4

WCB refers to a Grade of cast carbon steel in ASTM/ASME A/SA-216, which is "Specification for Steel Castings, Carbon, Suitable for Fusion Welding for High-Temperature Service". Grades of carbon steel castings are identified as WCA, WCB or WCC and vary based on alloy content, and mechanical properties.

Dear sir.
i have asked for the wcb meaning what you told i already know i means what is abbreviation of wcb or wcc (w means c means and b means) .thank u for response.
huzoor bux leghari

W for Weldable
C Cast
B (Grade of steel--Corresponds to A 106 Gr B, API 5L Grb, A 234 WPB etc)

Now what is WPB?

W Weldable
P Pipe form (made from Pipe)
B (grade of steel)