How to determine forging grade of pressure vessel
Forgings are divided into four grades I, II, II and IV. The inspection items of each grade are as follows: Forging level inspection item inspection quantity I hardness (HB): check one by one; II drawing and impact: same smelting furnace number, same furnace batch, sampling inspection for each batch -- pieces; I. drawing and impact: same smelting furnace number, same furnace batch, sampling inspection for each batch -- pieces. Ultrasonic testing: piece by piece;
More details