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Stainless steel: astm a403 wp 304/ 304l/ 304h/ 316/ 316l/ 317/ 317l/ 321/ 310/ 347/ 904l etc. Carbon steel: astm a234 wpb / a420 wpl3/ a420 wpl6/ mss-sp-75 wphy 42/ 46/ 52 / 56/ 60/ 65/ 70 Alloy steel: astm a234 wp1/ wp5/ wp9/ wp11/ wp22/wp91 etc.