SGI Bainitic Acicular Rolls

An acicular matrix, for strength in depth.

Hardness: 40-80 Shore D
Shop colour code: SGI Acicular

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In many cases, SGI rolls with an acicular matrix are preferred for their wear-resisting qualities. To this end the iron is alloyed with nickel and molybdenum, which permits an acicular structure to form in the as-cast condition.

These rolls are most suitable for heavier sections, where added strength and depth of hardness are required. Sand-cast acicular SGI iron is used for certain special purposes, with hardness typically from 65 to 75 Shore D.

An as-cast acicular structure gives added strength and depth of hardness for heavier sections.

Chemical composition

Hardness	C	Mn	Si	P	S	Ni	Cr	Mo	UTS
40-50	3.0/3.3	0.3/0.5	1.80/2.30	0.080 max	0.015 max	2.00/3.00	0.20 max	0.6/0.9	60-70
50-60	3.0/3.3	0.3/0.5	1.80/2.30	0.080 max	0.015 max	2.00/3.00	0.50 max	0.7/1.0	55-70
60-70	3.10/3.50	0.5/0.8	1.30/2.00	0.080 max	0.015 max	2.00/3.50	0.30/0.80	0.8/1.20	50-70
70-80	3.10/3.50	0.5/0.8	1.30/2.00	0.080 max	0.015 max	2.50/4.50	0.30/0.80	0.8/1.20	50-70