US 4,604,781 A · Highly abrasive resistant material and grinding roll surfaced therewith

Abstract

An alloy characterized by its highly abrasive resistant qualities which render it particularly suitable for use as the material from which to fabricate the external surface of a grinding, i.e., pulverizer, roll (18) of the type that is designed to be employed in a bowl mill (10) so as to be operative therein for purposes of effecting the pulverization of a material such as coal through the coaction of the grinding roll (18) with another surface (14) with which the bowl mill (10) is provided for this purpose. The subject alloy which is capable of being cast or applied to the grinding roll (18) in the form of a weld overlay comprises, by weight percentages, 4.0-6.0% Carbon; 3.0-14.0% Manganese; 1.0-2.5% Silicon; 15.0-30.0% Chromium; and 4.0-6.0% Molybdenum; with 0.5-2.0% Boron being added thereto, the balance being iron and incidental impurities.

Claims11

Dependent claims

A method of surfacing a new grinding roll comprising the steps of providing in powdered form a highly abrasive resistant alloy;

adding a binder to the highly abrasive resistant alloy;
mixing the binder with the highly abrasive resistant alloy to form pellets with each pellet having a homogeneous consistency;
drying the pellets to set the binder;
and providing the new grinding roll with a hardfacing having a composition, by weight percentages, of 4.0-6.0% Carbon;
3.0-14.0% Manganese;
1.0-2.5% Silicon;
15.0-30.0% Chromium;
and 4.0-6.0% Molybdenum;
and 0.5-2.0% Boron, the balance being essentially iron by applying the pelletized highly abrasive resistant alloy to the new grinding roll through the technique of bulk welding.

6 more elements

Dependencies are inferred from the claim text.

Highly abrasive resistant material and grinding roll surfaced therewith

Life of this patent

Highly abrasive resistant material and grinding roll surfaced therewith

Life of this patent

Abstract

Claims11