Hitachi Metals, Ltd.

In recent years, more and more has been demanded of screws and cylinders for plastic injection molding. Especially in the areas of plastic magnets and rubber magnets, higher wear and abrasion resistance than is offered by conventional glass reinforced plastics has now become a necessity. Applying its specialty steel and roll manufacturing technology, Hitachi Metals provides its customers with products that fulfill such needs.

Hitachi Metals has developed the H610 (Figure 1) Nickel-based alloy cylinder, which features substantially improved strength in both the H-ALOY and the base material. Hitachi Metals currently manufactures and delivers cylinders with diameters of φ120 or less to meet the expectations of its customers. Recently, in the engineering plastics extrusion mold industry, stringent demands are being placed on molding, for example for conversion to high injection pressure systems, high cycle molds and molding of difficult-to-mold materials to provide high-added value and reduce costs. As a result, demand has arisen for cylinders for high-strength injection molds with high levels of resistance to corrosion and wear and abrasion. However, Hitachi Metals' standard product, the H503 Nickel-based alloy cylinder, lacked the necessary durability to meet these demands. Although the end of the cylinder may be shrink-fitted to the sleeve to increase strength, this has the disadvantage of increasing the manufacturing cost of the cylinder as well as the production time. Hence, to overcome these difficulties, Hitachi Metals developed the H610 Nickel-based alloy cylinder as part of the H503 series.


The H610 series features a structural steel alloy base material with a centrifugal cast lining on the interior face of a Nickel-based alloy, which superior features corrosion-resistance and wear and abrasion resistance. The series has the following features.
(1) Significant increase in alloy strength and base material strength (Chart 1)
(2) Improved resistance to heat fissures (Figures 2, 3)

	Sintered Material		Characteristics of Alloy Layer		Strength of Base Material		Strength of pressure
Type	Alloy	Base Material	Hardness HRC	Transverse Strength kgf/mm2	Tensile Strength kgf/mm2	0.2% Strength kgf/mm2	Pressure Resistance (Compared to H503)
Standard Material (H503)	H503	SCM440	50~60	50~60	70~75	35~40	1
Newly Developed Material(H610)	H610	SCM440	50~60	95~110	82~90	47~55	1.7~2.3

H503 (Following heat treatment at 700°C)		H610 (Following heat treatment at 900°C)

H610 has been used in over 2,000 products, mainly small-scale cylinders. This has allowed Hitachi Metals to verify that that the results have lived up to the expectations of its customers. Increasing numbers of injection mold machine makers are considering converting to shrink-fit cylinders. In addition, Hitachi Metals was able to confirm in testing that H610 is highly compatible with the screws it manufactures and is suitable for difficult molding conditions. In the future, Hitachi Metals expects to continue to expand the range of cylinder dimensions and, in the field of injection molding, greatly increase added value and significantly decrease costs.

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