Flanges Detail: Type of flanges: Weld neck Slip-on Blind Socket weld Lap joint Spectacles Ring joint Orifice etc. Specifications and steel grades Carbon steel: astm a105/ a105n/ a694 f42/46/52/56/60/65/70 / a350 lf3/ a350 lf2, etc. Stainless steel: astm a182 f304/ 304l/ 304h/ 316/ 316l/ 317/ 317l/ 321/ 310/ 347/904l/ etc. Alloy steel: astm a182 f1/ f5/ f9/ f11/ f22/ f91/ etc. Size range: 1/8" up to 48" nb.