Main Features

For many years MMC Superalloy has manufactured and sold Mistubishi Alloy, which are super corrosion-resistant alloys, and BISHILITE (Mitsubishi Materials Hard-Facing Alloys), which are wear-resistant alloys. MA Plasthard is an alloy that has the combined advantages of a super corrosion-resistant alloy and a wear-resistant alloy, and it is used for cylinders and screws of various plastics or rubber extrusion machines and injection molding equipments. Our Plasthard alloys can serve to bring higher efficiency and stable operation to extrusion machines and injection molding equipments.

Mechanical properties

Advantages of high strength

This alloy is produced by forging. The cylinder material (MA Plasthard B-2) and screw material (MA Plasthard S & B-2) both have strength 1.5∼1.8 times higher than chromium Molybdenum steel (thermal refined), and moreover, maintain 7∼20% elasticity, enabling rigorous design. The alloy will not chip since it is fully resistant to thermal and mechanical shocks. Since welding is also possible, stains can be prevented completely as shown in the "Example of installation" figure.

	Tensile strength (N/mm2)	Yield strength (N/mm2)	Elongation (%)	Coefficient of Thermal Expansion (°C)	Specific thermal conductivity (W/m,K)	Torsional Strength (N/mm2)	Impact strength(J) CharpyV)
Plasthard S	1363	1098	26	12.4X10-6	9.4	834	127
Plasthard B-2	1237	782	25	11.5X10-6	11.3	981	58

Example of the installation of the MA Plasthard B-2 liner by the insertion method.

Mechanical properties in high temperatures(MA Plasthard S)

Cutting and Grinding conditions

For cutting & grinding processes, use materials such as Mitsubishi Materials' DIATITANIT HTi10 (JISK10) or HTi05T (JISK01). In particular, U615 (coated) shows excellent performance in grinding.

Available Product Forms

Bars and forgings can be manufactured.

Corrosion Resistance

Corrosion Resistance

	Plasthard S	Plasthard B-2	Nitrided steel	Ni-Co-Cr-B
50%Hydrochloric acid (*36% Hydrochloric acid)	0.05mm/Year	0.08mm/Year*	13mm/Year	0.4mm/Year
50% Sulfuric acid	0.003mm/Year	0.05mm/Year	3mm/Year	0.2mm/Year
10% Hydrofluoric acid 10% Hydrochloric acid	0.15mm/Year	0.46mm/Year	6mm/Year	0.2mm/Year

Hardness

	Plasthard S	Plasthard B-2	Ni-Co-Cr-B	Ni-Cr-Mo	Bishilite No.12
Rockwell C hardness	40∼45	25∼35	41∼48	(18)	47
(Converted to Shore hardness)	53∼59	38∼49	54∼64	30	63

Bishilite : Mitsubishi Materials Hard-Facing Alloys.