Mpm / Pqf Mandrel Bars for Producing Seamless Steel Pipes and Tubes
Yantai Fangle Metallurgy Group Co., Ltd.- Condition：New
- Certification：CE, ISO9001
- Standard：DIN, ASTM, GB
- Customized：Customized
- Material：Alloy
- Application：Metal Processing Machinery Parts
Base Info
- Model NO.：as the drawing
- Application Range：Continuous Rolling Mill,Mpm,Fqm,Pqf
- Transport Package：Woodern Case
- Specification：max 20m, Diameter 100mm-500mm
- Trademark：FANGLE
- Origin：China
- Production Capacity：50000tons,Year
Description
The steel shall be produced by the electric arc furnace and has to be vacuum degassed. Hydrogen must be held below 2.5 ppm and Oxygen below 30 ppm.
2. Hot Forming. The mandrel bars are to be forged from an ingot. The cross-sectional area of the solid forging shall have a reduction by hot forming from that of the ingot in the ratio of not less than 8 to 1. There should not have any defects.
3. Heat Treatment. The hot forming process shall be immediately followed by heat treating processes. .Material must ensure the required structure and mechanical properties.
4.Mandrel tests.
4.1 Mechanical properties
4.2 Tensile and impact tests
Tensile strength: RM = 1050 MPa Minimum (105 kg/mm²)
RM = 1280 MPa Maximum (130 kg/mm²)
Yield strength: Ys ≥ 880 MPa
Elongation: Min .A=10%
Reduction of area: Min.Z=30%
Charpy V-Notch impact test: Min. Kv ≥ 20j, testing at room temperature.
Charpy tests will be in transverse orientations.
4.3 Hardness tests
4.4 Microscopically Examinations
4.5 Microstructure after Heat Treatment
4.6 Austenitic Grain Size
4.7 Nonmetallic Inclusion Contents
4.8 Non destructive Tests
5. Straightness
6.Machining
7.Chrome plating
8. Marking
9.Protection and Packing
10.Certification
