welded stainless steel pipes (stainless tubing,stainless steel welded tubes) 1) Grade: 301, 321, 304, 304L, 316, 316L and etc. welded stainless steel pipes (stainless tubing,stainless steel welded tubes)Features ... petroleum, chemical, medical equipment, boiler heat-exchanger and other fields. welded stainless steel pipes (stainless tubing,stainless steel welded tubes)