eneral Technical Information
1) Production range: DN75MM-DN1000MM
2)  Material: 21CrMo10
3) Ultrasonic Test
The forging of the mould will be ultrasonically tested as per JB/T1581-1996 or equivalent standard, details as follows:
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.
4) Other items
Finish:  Ra1.6
Accuracy:  0.1mm
Concentricity:  1.1-1.9mm
Draft Taper:  0-0.9mm
Hardness:  HB 230-270
 5) P.S.
If the user has different requirements, please give us your requirements in detail along with inquiry.