ductile iron pipe mould

ductile iron pipe mould
  • Post Date: 9/10/2007
  • Expiry Date: 12/9/2007
ductile iron pipe mould

Detailed Product Description

1. Size: DN 80MM-DN 1000MM mould for ductile iron pipe

2.Material Grade
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 dia2~dia4mm is permitted, and the distance               of the neighboring defects should be more than the 10 times of the bigger ones. For 100cm2 area, the quantities of the defects with diameter of dia2~dia4mm should not exceed 3.
D: There should not have compact district.
3.Chemical composition
element C Si Mn P S Cr Mo Cu
The standard requirement 0.16~0.23 0.20~0.40 0.20~0.40 less than
0.011 less than
0.009 2.20~2.60 0.30~0.50 less than
0.20

4.Mechanical Properties
4.1 The place of sampling is the 1/2 of the forging wall thickness, and there will be two tensile test specimen in the direction of longitudinal, and the parameter of the performance is in the following table:
Parameter R MPa Rp0.2.Mpa A.% Z.%
index 750~850 more than 650 more than16 more than60
4.2 The method of the experiment
The tensile test as per GB/T288-2002.
5.The hardness of heat treatment,HB 240~280
And the experiment of hardness is as per GB/T231.

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