... Enterprise Standard2) Material of commonly used stainless steel:TP304,TP321,TP316L,TP309S,TP310;Material of other stainless steel:202,302,INCOL800,840,8253) ... status at delivery: bright/annealing Note:Producing stainless steel welded pipes used for electric heating tubes for well over a dozen years, the ... /tube as well as the property of extensibility. sell stainless steel pipes for electric heater