Stainless Steel
In metallurgy, stainless steel is a steel alloy with a minimum of 10.5% chromium content by mass.
Stainless steel does not readily corrode, rust or stain with water as ordinary steel does; but, despite the name, it is not fully stain-proof, most notably under low-oxygen, high-salinity, or poor-circulation environments. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required.
Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide; and, because of the greater volume of the iron oxide, this tends to flake and fall away. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure, and, due to the similar size of the steel and oxide ions, they bond very strongly and remain attached to the surface
CHEMICAL COMPOSITION OF STAINLESS STEEL( IN PERCENTAGE ) |
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|---|---|---|---|---|---|---|---|---|---|---|
Grade |
C (Max) |
Mn (Max) |
P (Max) |
S (Max) |
Si (Max) |
Cr |
Ni |
Mo |
Nitrogen (Max) |
Cu/ Others |
301 |
0.15 |
2.00 |
0.045 |
0.030 |
1.00 |
16.00 - 18.00 |
6.00 - 8.00 |
- |
0.10 |
- |
304 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
18.00 - 20.00 |
8.00- 10.50 |
- |
0.10 |
- |
304L |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
18.00 - 20.00 |
8.00- 12.00 |
- |
0.10 |
- |
310S |
0.08 |
2.00 |
0.045 |
0.030 |
1.50 |
24.00- 26.00 |
19.00 - 22.00 |
- |
- |
- |
316 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
16.00 - 18.00 |
10.00 - 14.00 |
2.00 - 3.00 |
0.10 |
- |
316L |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
16.00 - 18.00 |
10.00 - 14.00 |
2.00 - 3.00 |
0.10 |
- |
317 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
18.00 - 20.00 |
11.00 - 14.00 |
3.00 - 4.00 |
0.10 |
- |
317L |
0.030 |
2.00 |
0.045 |
0.030 |
0.75 |
18.00 - 20.00 |
11.00 - 15.00 |
3.00 - 4.00 |
0.10 |
- |
321 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
17.00 - 19.00 |
9.00 - 12.00 |
- |
0.10 |
Ti5 ( C + N ) Min or 0.70 max |
347 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
17.00 - 19.00 |
9.00 - 13.00 |
- |
- |
Cb= 10x ( C Min ) or 1.00 Max |
409 |
0.08 |
1.00 |
0.040 |
0.010 |
1.00 |
10.50 - 11.75 |
0.50 |
- |
- |
Ti= 6x (C+ N ) Min or 0.70 Max |
409M |
0.03 |
0.81.2 |
0.030 |
0.030 |
0.40.75 |
11.00- 12.00 |
1.5 max. |
- |
- |
Ti= 6x (C) Min or 0.70 Max |
410S |
0.08 |
1.00 |
0.040 |
0.030 |
1.00 |
11.50- 13.50 |
0.60 |
- |
- |
- |
410 |
0.15 |
1.00 |
0.040 |
0.030 |
1.00 |
11.50- 13.50 |
0.75 |
- |
- |
- |
420 |
0.35 |
0.50 |
0.035 |
0.015 |
0.50 |
12.00 - 13.00 |
0.20.3 |
- |
- |
- |
430 |
0.12 |
1.00 |
0.040 |
0.030 |
1.00 |
16.00 - 18.00 |
0.75 |
- |
- |
- |
JSL AUS |
0.08 |
7.08.0 |
0.070 |
0.030 |
0.75 |
15.50 - 16.50 |
4.25 - 4.75 |
- |
- |
0.9 - 1.10 |
JS- 203 |
0.08 |
9.2510.25 |
0.070 |
0.030 |
0.75 |
14.25 - 15.25 |
2.25 - 2.75 |
- |
- |
1.60- 2.0 |
301M |
0.10 |
4.55.5 |
0.060 |
0.030 |
0.75 |
14.50 - 15.50 |
6.0 - 7.0 |
- |
- |
1.70- 1.90 |
* Thickness of 1.27mm & below will have elongation of 20% min. |
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We EXPORT, SUPPLY & STOCK the following Grades of Stainless Steel in form of pipes, tubes, sheets, bars, rods, wire & fabricated product like heat exchanger, pressure vessel, column & towers, etc.: