In addition to carbon steel ball,chrome steel ball,stainless steel ball is always more be used for the valve body and valve ,because of its very strong rust preventing characteristics.Stainless steel ball mainly consists of austenite series and martensite series

Austenite series	martensite series
Representative of steel
304	440C
use
Generally used for valve body,stir,etc.	Ball bearing,valve etc.
features
Can not be hardened by heat treatment Excellent corrosion resistance High durability of non-magnetic	Can be hardened by heat treatment Having excellent mechanical properties
material
304 316	420 440
Specifications can be processed
0.3mm～3”（76.2mm）	0.4mm～4”（101.6mm）
hardness
HRC25～39	HRC58～65
grade
G500	G3～G200
Specific gravity
7.93	7.8
other
No rust Antimagnetic Machinable	Can rust (Rust much better than carbon steel chrome steel) Not magnetically shielded Can not be processed

StainlessSteel

Material	Chemical Composition(%)
	C	Si	Mn	P	S	Ni	Cr	Mo	Cu
AISI 440C	0.95-1.20	1.00max	1.00max	0.040max	0.030max	0.60max	16.00-18.00	0.75max	---
AISI 420C	0.42-0.50	1.00max	1.00max	0.040max	0.030max	1.00max	12.5-14.5	---	0.30max
AISI 304	0.08max	1.00max	2.00max	0.045max	0.030max	8.00-10.50	18.00-20.00	---	---
AISI 316	0.08max	1.00max	2.00max	0.045max	0.030max	10.00-14.00	16.00-18.00	2.00-3.00	---

Stainless steel ball machining accuracy according to customer requirements.

Production specificationsΦ0.5mm ～Φ12.7mm

Also according to customer requirements other non-standard specifications Ball can be produced

Stainless steel balldiametermatchingtable

Nominal	Diameter	Nominal	Diameter	Nominal	Diameter
0.5mm	0.5000	3.5mm	3.5000	17/64	6.7469
0.6mm	0.6000	9/64	3.5719	9/32	7.1438
0.7mm	0.7000	5/32	3.9688	7.5mm	7.5000
0.8mm	0.8000	4mm	4.0000	5/16	7.9375
1mm	1.0000	4.5mm	4.5000	8mm	8.0000
1.2mm	1.2000	3/16	4.7625	8.5mm	8.5000
1.5mm	1.5000	5mm	5.0000	11/32	8.7313
1/16	1.5875	5.5mm	5.5000	3/8	9.5250
2mm	2.0000	7/32	5.5563	10mm	10.000
3/32	2.3812	15/64	5.9531	13/32	10.3188
2.5mm	2.5000	6mm	6.0000	7/16	11.1125
3mm	3.0000	1/4	6.3500	15/32	11.9063
1/8	3.1750	6.5mm	6.5000	1/2	12.7