NI Hard White Cast Irons | Allen Foundry Company, Australia

NI HARD WHITE CAST IRONS

Ni Hard is the trade name for a group of nickel chromium alloyed white cast irons possessing outstanding resistance to abrasion.

Ni Hard types 1 and 2 have proved an economic replacement for white cast iron under most conditions of wear-resisting service and for carbon and 12% manganese steels for wear resistance under conditions of moderate impact. Increased wear and impact resistance are possible with Ni Hard 4.

Differences in service properties of Ni Hards 1, 2 and 4 are explainable in terms of their microstructural characteristics.

COMPOSITION AND HARDNESS

	Composition, per cent								Brinell Hardness
	C	Si	Mn	Ni	Cr	S	P	Mo	Spec.	Typical
Ni Hard type 1	3.20	0.30	0.20	3.00	1.50	0.12	0.15	0.50	550	600
(AS2027 Gr Ni Cr 1-550)	3.60	0.80	0.80	5.00	3.00	max.	max.	max.	min.
Ni Hard type 2	2.80	0.30	0.20	3.00	1.50	0.12	0.15	0.50	500	550
(AS2027 Gr Ni Cr 2-500)	3.20	0.80	0.80	5.00	3.00	max.	max.	max.	min.
Ni Hard type 4	3.20	1.50	0.20	4.00	8.00	0.12	0.15	0.50	630	670
(AS2027 Gr Ni Cr 4-630)	3.60	2.20	0.80	5.50	10.00	max.	max.	max.	min.

TYPICAL APPLICATIONS

Ni Hard types 1 and 2

Metal-working rolls
Grinding mill liners
Pulveriser rings
Slurry pump parts
Grinding media

Ni Hard type 4 � �

Slurry pump parts
Impact blow bars