... 2. F316, F51,35CrMo, 36CrNiMo4 and so on 3. Heat treatment 4. detailed record cards of process 1. A105 Q235 ... .8. Used for : petroleum,chemical,power,gas,water,linepipe, heat exchanger,shipbuilding,construction,etc.9. Tolerance:not less than +_8% of ... thickness.10.Production process : raw material--cutting--heating--forging--heat treatment--maching--inspection.-washing-ex-working.11. Mill ceitificate : ...