Alloy 303 is a non-magnetic, austenitic stainless steel that is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium / 8% nickel stainless steel. Alloy 303 was specially designed to exhibit improved machinability while maintaining good mechanical and corrosion resistant properties Due to the presence of sulfur in the steel composition, Alloy 303 is the most readily machineable austenitic stainless steel; however, the sulfur addition does lower Alloy 303’s corrosion resistance to below that of Alloy 304. Like other austenitic grades, Alloy 303 demonstrates excellent toughness, although the sulfur does reduce this a little as well.
Alloy 303 is resistant to mildly corrosive environments. However, the alloy’s corrosion resistance is inferior to 304 in most applications. Its corrosion resistance is superior to 416, another free-machining grade, but is somewhat inferior to other 400 series stainless steels which do not contain higher sulfur levels. In order to obtain optimal corrosion resistance, it is recommended that Alloy 303 be chemically treated to remove sulfides from the final surfaces.
| Chromium | Nickel | Carbon | Manganese | Phosphorus |
| 17.0 min.-19.0 max | 8.0 min.-10.0 max. | 0.10 | 2.00 | 0.20 |
| Sulfer | Silicon | Copper | Nickel | Iron |
| 0.15-0.35 | 1.00 | 1.00 | 0.110 | Balance |
| Yield Strengtd 0.2% Offset | Ultimate Tensile Strengtd | Elongation in 2 in. | Hardness | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
| 45,000 | 310 | 85,000 | 586 | 50 | 202 (HBN) |
| Density lb/inᶟ | 0.290 |
| Density g/cmᶟ | 7.89 |
| Melting Point | 2552°F |
| Thermal Conductivity at 212°F (100°C) | 112 BTU/hr/ft²/ft/°F |
| Thermal Conductivity at 212°F (100°C) | 16.2 W/m-°K |
| Electrical Resistivity | 28.3 Microhm-in at 68°C |
| Electrical Resistivity | 72.0 Microhm-cm at 20°C |
| Machinability | High Speed Tooling | Carbide Tooling |
Deptd, Widtd or Diameter of Tool |
||
|
Speed (sfm) |
Feed (in./rev.) |
Speed (sfm) |
Feed (in./rev.) |
(in.) (dia./in.) |
|
| Turning |
115 135 |
0.0150 0.0050 |
375 600 |
0.025 0.007 |
0.005-0.200 0.002-0.004 |
| Cut-off |
90 100 |
0.0015 0.0025 |
275 325 |
0.002 0.004 |
1/16 1/4 |
| Forming |
100 100 |
0.0020 0.0015 |
375 350 |
0.003 0.002 |
1 2 |
| Drilling |
70 85 100 |
0.0060 0.0100 0.0200 |
— 700 800 |
— 0.005 0.007 |
1/4 1/2 1-2 |
| Reaming |
90 90 |
0.0050 0.0150 |
— — |
— — |
1/4 1-2 |
| End Milling |
130 130 |
0.0030 0.0060 |
300 350 |
0.004 0.009 |
1/2 1-2 |
| Tapping and tdreading |
10 40 |
— — |
— — |
— — |
7 tdreads/in. 25 tdeads/in. |
If you are interested in other Stainless Steel Channels, please click 302, 303, 304, 304L, 304H, 309, 309S, 310, 310S, 310H, 316, 316L, 317/317L, 317LMN, 321, 321H, 330, 347, 347H, 904L, 403, 405, 409, 410, 410S, 410/HT, 416, 416HT, 420, 422, 430, 440C, Duplex 2205, Duplex 2304, Duplex 2507.
Phone/whatsapp/wechat: 0086-13347910998
Add: 20-2-1705, Dongting Middle Road, Xishan District, Wuxi city, Jiangsu Province, China
E-mail: vicky@zzlsteel.com
Jiangsu Zhongzhilian Steel Industry Co., Ltd., established in 2005,is a experienced manufacturer of steel products. It is located in Wuxi, one of the biggest stainless steel bases in China. The monthly production quantity is at least 10,000 Mt.Our factory covers an area of 50，000 square meters. There are five finishing rolling production lines and two hot rolling production lines as well as advanced computer-controlled automation systems. The whole set of machines and equipment are imported from Japan and Germany which guarantee the stable quality of our products. Moreover, to meet the increasingly high standard of the market, we keep introducing ...
Read MorePhone/whatsapp/wechat: 0086-13347910998
Add: 20-2-1705, Dongting Middle Road, Xishan District, Wuxi city, Jiangsu Province, China
E-mail: vicky@zzlsteel.com
