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2101 alloy is a low nickel, lean duplex stainless steel that is designed with both superior strength and chloride stress-corrosion cracking resistance, which are much better than 300 series stainless steels.
2101 was developed for general-purpose use. High chromium and nitrogen content of this alloy along with molybdenum content provide excellent resistance to localized and uniform corrosion.
2101 acts as a low nickel general purpose substitute for stainless steel grades 304 and 304L. This alloy possesses good fatigue strength, chloride pitting resistance, and good machinability and weldability.
The chemical composition of stainless steel grade 2101 is outlined in the following table.
| Element | Content (%) |
|---|---|
| Chromium, Cr | 21-22 |
| Manganese, Mn | 4-6 |
| Nickel, Ni | 1.35-1.70 |
| Silicon, Si | 1 max |
| Nitrogen, N | 0.20-0.25 |
| Copper, Cu | 0.10-0.80 |
| Molybdenum, Mo | 0.10-0.80 |
| Phosphorous, P | 0.040 max |
| Carbon, C | 0.040 max |
| Sulfur, S | 0.030 max |
| Iron, Fe | Balance |
| Grade | UNS | ASTM | EN | AMS | GB | JIS | |
| 2101 | S32101 | ASTM A240 | 1.4162 | - | - | - | |
| Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet/Plate | Bar |
|
A790
|
A790
|
A789
|
A789
|
A240
|
A276
|
The 300 series stainless steels are used extensively in numerous process industries due to their overall general corrosion resistance. The corrosion resistance of LDX 2101 is generally better than 304L and comparable to 316L making it suitable for use in a wide variety of industries and applications.
Chloride Pitting Resistance
The pitting resistance of an austenitic stainless steel can be related directly to alloy composition, where chromium, molybdenum and nitrogen are a weight %. The Pitting Resistance Equivalent Number (PREN) uses the following formula to measure an alloy's relative pitting resistance - the higher the number, the better the pitting resistance.
The Critical Crevice Corrosion Temperature (CCCT) test is often used to compare the crevice corrosion resistance of various alloys.
Stress-Corrosion Cracking Resistance
Chloride stress-corrosion cracking (SCC) is one of the most serious forms of localized corrosion. Higher temperatures and reduced pH will increase the probability of SCC. The onset of SCC is one of the most common reasons for stainless equipment failure. Because of its duplex structure LDX 2101 offers excellent resistance to SCC.
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