304/304L polished stainless sheet coil and sheet is part of the austenitic family of stainless steel. 304 grades contain a lower level of carbon than 302 and 304/304L has a lower carbon level than straight grade 304. Types 304 and 304L have very good draw-ability and excellent corrosion resistance in chemical, textile, petroleum and food industry exposure. No. 4 polished surface is a non-reflective brushed finish obtained by course grinding followed by finishing with a 120-150 mesh abrasive. This general purpose bright finish has a visible grain to prevent mirror reflection. Polished surfaces are easy to clean, ensuring a minimum foothold for dirt, bacteria and corrosive substances.
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Typical Chemical Requirements |
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304 |
304L |
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Carbon, Max % |
0.08 |
0.03 |
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Manganese, Max % |
2 |
2 |
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Phosphorus, Max % |
0.045 |
0.045 |
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Sulphur, Max % |
0.03 |
0.03 |
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Silicon Max |
0.75 |
0.75 |
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Chromium range |
18-20 |
18-20 |
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Nickel range |
8.0-10.5 |
8.0 - 12 |
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Nitrogen Max |
0.1 |
0.1 |
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Mechanical Properties |
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304 |
304L |
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Tensile Min |
75 ksi |
70 ksi |
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Yield Min |
30 ksi |
25 ksi |
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Elongation Min |
40% |
40% |
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Hardness Max |
95 HRB |
95 HRB |
