Plastics processing machine components and alloy for use therein

Details Plastics processing machine components and alloy for use therein Plastics processing machine components and alloy for use therein

1987-02-27

1988-08-23

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428680, 420442, 420441, B32B 1518, C22C 1905

Patent

active

047660422

ABSTRACT:
A plastics processing machine component, such as a lined composite heating cylinder or a hardfaced feed screw, wherein a layer of a hard, corrosion-resistant alloy is joined to a component substrate in the form of the part to be protected. The alloy has a composition, in weight percent, of from about 12 to about 16 percent molybdenum, from about 10 to about 14 percent chromium, up to about 1.2 percent carbon, up to about 3.5 percent silicon, from about 0.5 to about 3.5 percent boron, balance nickel. Such alloys are resistant to corrosion damage from hydrogen chloride and hydrogen fluoride environments, have sufficient fluidity to permit centrifugal casting in the temperature range of 1800.degree. F. to 2250.degree. F., and can be tailored to have hardnesses from about 45 to over 60 R.sub.c.

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Spirex "Screw and Barrel Technology" Spirex Corporation 1985, pp. 7-11.
ASME Boiler and Pressure Vessel Code, Part C. 1986. pp. 211-218.

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