End-Quench Hardenability Bands — 4145 H to 4620 H - METRIC
Tabulations of Band Limits
“J” Distance Millimeters	GRADE
	4145 H		4147 H		4150 H		4161 H		4320 H		4340 H		E 4340 H		4620 H
	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
1.5	63	56	64	57	65	59	65	60	48	41	60	53	60	53	48	41
3	63	55	64	57	65	59	65	60	47	39	60	53	60	53	46	37
5	63	55	64	56	65	58	65	60	45	35	60	53	60	53	42	28
7	62	54	64	55	65	58	65	60	42	30	60	53	60	53	37	23
9	62	53	63	55	65	57	65	60	39	27	60	53	60	53	33	—
11	61	52	63	55	65	57	65	60	36	25	60	53	60	53	30	—
13	61	51	63	54	65	56	65	60	34	23	60	52	60	53	27	—
15	60	50	63	53	64	55	65	60	32	22	60	52	60	53	26	—
20	59	47	62	50	63	51	65	58	28	—	59	50	60	52	23	—
25	58	42	60	45	62	47	64	56	26	—	58	48	59	51	22	—
30	57	39	59	42	61	44	63	53	25	—	58	46	58	50	21	—
35	56	37	58	39	60	41	63	50	25	—	57	44	58	49	—	—
40	55	35	57	37	59	39	63	46	24	—	57	43	57	47	—	—
45	55	34	57	36	58	38	63	43	24	—	56	42	57	46	—	—
50	55	34	56	36	58	38	63	41	24	—	56	40	57	44	—	—

NOTE:

These values were adjusted to the nearest Rockwell “C” point, and are used when points are selected and specified.

Gerdau MACSTEEL Home Profile | Capabilities | Quality | Engineered Bar Products | NitroSteel Division Heating Treating Division | Capital Improvement | News Releases/Hot Links | Site Map | Contact Info | Metallurgical Data Book