... 4.Application:boiler,heat exchanger,etc. STB340 seamless alloy steel pipe Specifications Descriptionseamless alloy steel pipestandardGB9948 , GB5310, GB6479, ASTM A213 ... 8215598Fax:0086 635 8205548 seamless carbon steel pipe ProductsODW.T.StandardLengthSeamless pipe1/2" to 24"SCH20,30,40,60,STD XS ... 40,60,STD XS,80AY/T5037-20015.8m,6m,5m to 12m randomWe supply seamless steel pipes,welded steel pipes, ...