Pipe fittings, include elbow , flange ,Tee,reducer, couplings, caps,and so on, ASTM A234 standardsDIN2527,DIN2566,DIN2576,DIN2641,DIN2642,DIN2655,DIN2656,DIN2628,DIN2629,DIN2631,DIN2632,DIN2633,DIN2634,DIN2635, DIN2636,DIN2637,DIN2638,DIN2673.ASTM A105,A182,A694grade?ST37.2,ST45.8,ST35.8,C22.8,SS400,SM400B,20M,20#,Q235,F304/304L,F316/316L,F321,F11/42/46/52/60/65,15CrMo,12Cr1MoV.place of ...