Product Description

Operatinal Progress:
Steel-making— Blanking— Forging Steel— Rough Progressing— Heat Treatment— Finishing— Testing

We manufacture shear blades up to ***0mm(*8.*4 inches) in length for cutting sheet steel etc.

Steel-making by medium frequency furnaces
Steel-making by medium frequency furnacesSteel-making begins from the start of this century in Jinhai Company. So the company can meet special requirements for materials. In order to guarantee the quality, Jinhai company imported spectrometer from Germany and is equipped with various tester, such as tensile tester, impact testing machine, metallography analyzer and so on.

Electro slag remelting
The largest ingot can reach 3 tons in Jinhai company. The ingot obtained by this remelting/refining process is very homogeneous and free of internal defects. The segregation of the ingot(called macro-segregations) are substantially eliminated and the segregations of crystals(called micro-segregations)are significantly reduced. The ESR remelted material improve following mechanical characteristics:
. Improved toughness due to increased homogeneity and isotropy
. Improved creep resistance properties
. Best fatigue strength and tenacity properties as well as outstanding tensile strength
. Improved purity

Forging steel
Forging process can trance to ***0s in Jinhai company. The largest electro-hydraulic hammer is 4.5 ton. And more than 6 skilled technicians work here. After forging the inside microstructure becomes much closer and the metal grain size becomes much smaller. It can elevate the characteristics and quality of the knife ensuring a longer life of the knife.

Rough processing
No less than *0 sets of processing equipment in the rough processing workshop of Jinhai company, including lathe, milling machine, planer, drill machine etc. Skilled workers are employed in its rough processing workshop.

Heat treatment
Jinhai company has independent workshop for heat treatment. Couples of skilled technicians work here. Actually, all blades(thickness less than**0MM)can be fully hardened. Thus, the blades can be used after repairing until the size reached the minimum design dimension.

Finishing processing
Jinhai company has more than *5 sets of processing equipment including internal grinder, external grinder, surface grinder, CNC grinder, electric spark CNC wire-cut etc. The company can produce the shearing blades with ***0mm in length and slitting knives with ***0mm in outside diameter.

Testing
Various testers are put to use for testing its products in Jinhai company. They are including tensile tester impact testing machine, metallography analyzer, harmless flaw detector, magnetic powder inspection, hardness tester, caliper rule, microcalliper, etc. Testing is carried out after each step. And every products has a unique tracking number. Thus it is easy to trace back anytime.

Jinhai company has one independent R&D department which is fully equipped with experimental and testing facilities. Until now, we have developed some high alloy steel, like HMB, HMK etc. They are new materials independently developed by our company and excellent in high intensity, high hardness, high wear resistance, high toughness, high hot hardness and so on. They can be used in both cold and hot shearing and have been rewarded the national invention patens. The life of blades and knives made of HMB and HMK is **3 times longer.