... , P11, P12, P21, P22, P91, P92Usage: High temperature service 1/ Product name ASTM A335 alloy steel pipe2/ Standard ASTM SA213, SA335, A369, A209 ... temperature resistance, corrosion resistance in pilie lines, etc. HIGH QUALITY, COMPETIIVE PRICE, EXCELLENT SERVICE ARE YOUR BEST CHOICE Seamless Alloy-Steel Pipe 34CrMo4