... welded stainless steel pipe 2.Grade: 201,202,302,303,304,304L,306 etc. 3.Size: OD:10-159mm WT:1 ... LR DNV and Rules for shipes, etc. 2. Material /Grade: 304/L/H, 316/L/H, 321/H, 317/L, 347 ... than 70% specified value Impact test results judgement stainless steel 304 pipe