Korea produces the best steel in the most competitive price because of the POSCO, the world’s largest steel mill. And the hot forging technology is more widely used then casting in Korea, partly due to the influence from neighbor Japan.
Hot forging provides better microstructure and mechanical properties and better tolerances. The supplier is TS16949 certifid and experienced exporter for valve train products and power train products.tem of a car is intended to allow the vehicle to accept vertical irregularities in the roads on which it travels with as little disturbances as possible.
1600 ton press 2 line
1350 ton press 4 line
750 ton press 1 line
Microalloy Hot Forging
Microalloyed steel is a type of alloy steel that contains small amounts of alloying elements (0.05 to 0.15%). Standard alloying elements include: niobium, vanadium, titanium, molybdenum, zirconium, boron, and rare-earth metals. They are used to refine the grain microstructureand/or facilitate precipitation hardening.
These steels lie, in terms of performance and cost, between carbon steel and low alloy steel. Yield strength is between 500 and 750 MPa (73,000 and 109,000 psi) without heat treatment. Weldability is good, and can even be improved by reducing carbon content while maintaining strength. Fatigue life and wear resistance are superior to similar heat treated steels. The disadvantages are that ductility and toughness are not as good as quenched and tempered (Q&T) steels. They must also be heated hot enough for the all of the alloys to be in solution; after forming the material must be quickly cooled to 540 to 600 °C (1,004 to 1,112 °F).
Cold worked microalloyed steels do not require as much cold working to achieve the same strength as other carbon steel; this also leads to greater ductility. Hot worked microalloyed steels can be used from the air-cooled state. If controlled cooling is used, the material can produce mechanical properties similar to Q&T steels. Machinability is better than Q&T steels because of their more uniform hardness and theirferrite-pearlite microstructure.
Because microalloyed steels are not quenched and tempered they are not susceptible to quench cracking, nor do they need to bestraightened or stress relieved. However, because of this they are through hardened and do not have a softer and tougher core like quench and tempered steels.
Here are typical papameters for the hot forging of the Microalloy.
- Heating temperature: 1150 ~ 1250 deg C
- Forging temperature: 1100 ~ 1200 deg C
- Trimming temperature: 1050 ~1150 deg C
- Loading to conveyor temperature: 1000~1050 deg C
- Exiting the cooling conveyer temperature: 600 deg max.
- Cooling line length: 7 M min.
- Enclosed conveyor capable of air blower and air circulation.
- The cooling speed should be controlled at 50 deg C./min +/- 20 deg C.