Product Description
General Technical Information
1) Production range: DN75MM-DN1000MM
2) Material: 21CrMo10
Chemical Composition
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Cu
|
|
0.16~0.23
|
0.20~0.40
|
0.20~0.40
|
≤0.015
|
≤0.009
|
2.20~2.60
|
0.30~0.50
|
≤0.20
|
3)Mechanical Properties
|
Tensile Strength σb Mpa
|
Yield Strength
σs Mpa
|
Elongation
δ %
|
Reduction Area ψ %
|
|
750~850
|
≥650
|
≥16
|
≥60
|
4) 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.
5) Other items
Finish: Ra1.6
Accuracy: 0.1mm
Concentricity: 1.1-1.9mm
Draft Taper: 0-0.9mm
Hardness: HB 230-270
6) P.S.
If the user has different requirements, please give us your requirements in detail along with inquiry.
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