Standard for Hardness and Strength of Ferrous Metals

View: 268906/08/2017

Rockwell hardness			Brinell hardness		HV	tensile strength(KG/mm2)					Approximate strength kg / mm 2 (regardless of steel)
HRC	HRA	HR15N	Indentation diameter	HB		Carbon steel	Chrome nickel steel	Chrome nickel molybdenum steel	Chromium manganese silicon steel	Ultra high strength steel
			d*10/3000
			(mm)
70	86.6				1037
69	86.1				997
68	85.5				959
67	85				923
66	84.4				889

65	83.9	92.2			856
64	83.3	91.9			825
63	82.8	91.7			795
62	82.2	91.4			766
61	81.7	91			739

60	81.2	90.6			713					269.1	260.7
59	80.6	90.2			688					255.8	249.6
58	80.1	89.8			664					243.7	239.1
57	79.5	89.4			642					232.6	229.3
56	79	88.9			620					222.4	220.1

55	78.5	88.4			599		209.8		208.6	213.1	211.5
54	77.9	87.9			579		202.5		201	204.5	203.4
53	77.4	87.4			561		195.5	198.5	193.3	196.7	195.7
52	76.9	86.8			547		188.7	191.8	187	189.4	188.5
51	76.3	86.3	2.73	510	525		182.1	185.4	180.4	182.7	181.7

50	75.8	85.7	2.77	488	500	174.4	175.8	179.3	174.2	176.5	175.3
49	75.3	85.2	2.81	474	493	168.6	169.8	173.3	168.3	170.7	169.2
48	74.7	84.6	2.85	461	478	163.1	164	167.6	162.7	165.2	163.5
47	74.2	84	2.886	449	463	158.4	158.4	162	157.3	160	158.4
46	73.7	83.5	2.927	436	449	153.3	153.1	156.7	152.2	155	152

45	73.2	82.9	2.967	424	436	148.8	148	151.6	147.4	150.2	148
44	72.6	82.3	3.006	413	423	144.5	143.1	146.7	142.7	145.5	143.4
43	72.1	81.7	3.049	401	411	140.5	138.5	142	138.4	140.9	138.9
42	71.6	81.1	3.087	391	399	136.7	134	137.5	134.2	136.2	134.7
41	71.1	80.5	3.13	380	388	133.1	129.8	133.4	130.2	131.5	130.7

40	70.5	79.9	3.171	370	377	129.6	125.7	129	126.4	126.7	126.8
39	70	79.3	3.214	360	367	126.3	121.9	125	122.8	121.8	123.2
38	69.5	78.7	3.258	350	357	123.1	118.2	121.2	119.4	116.7	119.7
37	69	78.1	3.299	341	347	120	114.8	117.6	116.1	111.4	116.3
36	68.4	77.5	3.343	332	338	117	111.5	114.1	113	105.9	113.1

35	67.9	77	3.388	323	329	114.1	108.4	110.8	110.1	100	110
34	67.4	76.4	3.434	314	320	111.3	105.4	107.7	107.3	一	107
33	66.9	75.8	3.477	306	312	108.6	102.7	104.7	104.6	一	104.2
32	66.4	75.2	3.522	298	304	106	100.1	101.8	102	一	101.5
31	65.8	74.7	3.563	291	296	103.4	97.8	99.1	99.6	一	98.9

30	65.3	74.1	3.611	283	289	100.9	95.3	96.6	97.3	一	96.4
29	64.8	73.5	3.655	276	281	98.4	93	94.1	95.1	一	94
28	64.3	73	3.701	269	274	96.1	91.2	91.8	93	一	91.7
27	63.8	72.4	3.741	263	268	93.7	89.3	89.7	91	一	89.5
26	63.3	71.9	3.783	257	261	91.4	87.6	87.6	89.2	一	87.4
25	62.8	71.4	3.826	251	255	89.2	86	一	87.4	一	85.4
24	62.2	70.8	3.871	245	249	87	84.5	一	85.6	一	83.5