Product Description
2.1 The steel used for the mould: DIN17350, and the steel: 21CrMo10.
2.2 Steel—making method: basic arc furnace and ladle refining furnace refining melted (vacuum degassed)
2.3 Ultrasonic flaw detection
The forging of the mould will be ultrasonically tested as per JB/T1581-1996, and the grade of the detection is in the following:
A: Without bursts, crack, shrinking hole and other defects.
B: The defect with size within ￠2mm can be ignored.
C: Individual defect with diameter of φ2~φ4mm is permitted, and the distance of the neighboring defects should be more than the 10 times of the bigger one’s. For 100cm2 ‘s area, the quantities of the defects with diameter of φ2~φ4mm should not exceed 3.
D: There should not have compact district。
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