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Chrome Steel Balls-Application Standards

The bearing steel balls we supply is applying international standard and also can by customer's specic needs.
Main Standards of Steel Balls:
International Standards： ISO3290-2002
Chinese Standards: GB308-2002
German Standards: DIN5401-11.1993
American Standards: ANSI/AFBMA-10.1989


Technology Parameter of Heat Treatment:
Hardness:By reference of Chinese Standards GB/T308-2002

diameter		hardness
over	to	HRC
--	30	60--66
30	50	59--64
50	--	58--64


Loads of Crushing: By reference of Chinese Standards JB/T1255-2001 ( KN)

dia.	Loads	dia.	Loads	dia.	Loads
3	4.8	13	87.22	26	333.2
3.175	5.39	13.4938	94.08	26.9875	357.7
3.9688	8.43	14	100.94	28	385.14
4	8.53	14.2875	104.86	28.575	396.9
4.5	10.78	15	115.64	30	439.04
4.7625	12.05	15.0812	116.62	30.1625	441
5	13.33	15.875	128.38	31.75	487.06
5.5562	16.27	16	131.32	32	494.9
5.9531	18.13	16.6688	142.1	33.3375	534.1
6	19.01	17	147	34	557.62
6.35	21.27	17.4625	154.84	34.925	582.13
6.7469	24	18	164.64	35	588
7	25.87	18.2562	168.56	36	617.4
7.1438	26.95	19	182.77	36.5125	632.1
7.9375	32.83	19.05	183.26	38	683.06
8	33.32	19.8438	198.94	38.1	689
8.7312	39.69	20	201.88	40	745.78
9	41.94	20.6375	214.62	41.275	798.7
9.5	46.84	21	241.03	42	823.2
9.525	47.04	22	241.03	44.45	911.4
10	51.94	22.225	246.96	45	931
10.3188	54.88	23	262.64	47.625	103.88
11	62.72	23.0188	257.74	48	1068.2
11.1125	63.7	23.8125	281.26	50	1156.4
11.5	68.51	24	287.14	50.8	1166.2
11.5094	68.6	25	309.68
11.9062	73.5	25.4	318.5
12	74.48
12.3031	78.4
12.7	83.3