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Stainless Steel (B Scale)

Approximate Hardness Conversion No.’s for
Austenitic Stainless Steel Sheet

Rockwell Hardness Number B Scale, 100 Kgf (HRB)	Rockwell Hardness Number A Scale, 60 Kgf (HRA)	Rockwell Superficial Hardness No. 15T Scale, 15 Kgf (15T)	Rockwell Superficial Hardness No. 30T Scale, 30 Kgf (30T)	Rockwell Superficial Hardness No. 45T Scale, 45 Kgf (45T)
100	61.5	91.5	80.4	70.2
99	60.9	91.2	79.7	69.2
98	60.3	90.8	79	68.2
97	59.7	90.4	78.3	67.2
96	59.1	90.1	77.7	66.1
95	58.5	89.7	77	65.1
94	58	89.3	76.3	64.1
93	57.4	88.9	75.6	63.1
92	56.8	88.6	74.9	62.1
91	56.2	88.2	74.2	61.1
90	55.6	87.8	73.5	60.1
89	55	87.5	72.8	59
88	54.5	87.1	72.1	58
87	53.9	86.7	71.4	57
86	53.3	86.4	70.7	56
85	52.7	86	70	55
84	52.1	85.6	69.3	54
83	51.5	85.2	68.6	52.9
82	50.9	84.9	67.9	51.9
81	50.4	84.5	67.2	50.9
80	49.8	84.1	66.5	49.9