1. Production Name: Mandrel bar ( Working Part )
2. Material:H13（4Cr5MoSiV1）
3. Chemical Composition:
|
Element |
C |
Mn |
Si |
P+S |
S |
Cr |
Mo |
V |
|
(%) |
0.32-0.42 |
≤0.060 |
0.70-1.20 |
≤0.020 |
≤0.008 |
4.50-5.50 |
1.00-1.50 |
0.78-1.20 |
4. Steel Melting:
Electric Furnace + (BOF)Vacuum Degassed + Electroslag Remelt.
5. Hot Forming:
Forged from an ingot. The ratio of the cross sectional area of the ingot to the resulting cross sectional area of the solid forging shall not be less than 8 to 1.
6. Mechanical properties:
|
SIZE
（Q+T） |
Tensile Strength
MPa |
Yield Strength MPa |
Elongation
% |
Reduction of area
% |
Charpy V-notch Impact test（J）
(room temperature) |
Hardness
HB |
|
≤200mm |
1127-1274 |
≥931 |
≥8 |
≥25 |
≥20 |
350-390 |
|
≥200mm |
1078-1274 |
≥882 |
≥8 |
≥25 |
≥20 |
330-375 |
7. Chrome Plate Thickness: 0.055-0.070