JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
WUXI DETA METAL PRODUCTS CO.,LTD
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UNS S32101 is a 21.5% chromium, 5% manganese, 1.5% nickel, 0.45% molybdenum lean duplex stainless steel with corrosion resistance superior to 304L and comparable to 316L. LDX 2101 possesses both superior strength and greater chloride stress-corrosion cracking resistance than conventional 300 series stainless steels.
The enhanced mechanical strength of LDX 2101 enables it to be used in thinner cross-sections which can provide significant cost savings to the end user. LDX 2101 was designed to be a low nickel general purpose substitute for 304 and 304L.
LDX 2101 is a low-nickel, nitrogen enhanced lean duplex stainless steel developed for general-purpose use. The austenitic-ferritic (duplex) structure of the alloy is balanced to approximately equal amounts of ferrite and austenite in the solution-annealed condition.
The high chromium and nitrogen content of LDX 2101, combined with an addition of molybdenum, provide very good resistance to localized and uniform corrosion. The duplex microstructure contributes to the alloys high strength and resistance to chloride stress-corrosion cracking. LDX 2101 possesses both superior strength and greater chloride stress-corrosion cracking resistance than conventional 300 series stainless steels.
The corrosion resistance of LDX 2101 is generally good making it suitable for use in a wide variety of applications. In most environments, it is superior to 304L stainless steel and comparable to the molybdenum containing 316L stainless steel.
The enhanced mechanical strength of LDX 2101 is far superior to conventional 300 series stainless steels enabling it to be used in thinner cross-sections which can provide significant cost savings to the end user.
LDX 2101 exhibits good abrasion and erosion resistance and can be fabricated using standard shop practices developed for duplex stainless steels.
Typical Values (Weight %)
| Chromium | 21.0 min. - 22.0 max. | Nickel | 1.35 min. - 1.70 max. |
| Manganese | 4.00 min. - 6.00 max. | Molybdenum | 0.10 min. - 0.80 max. |
| Nitrogen | 0.20 min. - 0.25 max. | Chromium | 0.040 max. |
| Silicon | 1.00 max. | Phosphorus | 0.040 max. |
| Copper | 0.10 min. - 0.80 max. | Nitrogen | 0.030 max. |
| Iron | Balance* |
* Alloy predominates remaining composition. Other elements may be present only in minimal quantities.
| Temperature, °F | |||||
|---|---|---|---|---|---|
| 68 | 200 | 400 | 600 | ||
| Density | lb/in3 | 0.28 | |||
| Modules of Elasticity | x 10sup>6 psi | 29 | 28 | 27 | 26 |
| Poissons Ratio | 0.3 | ||||
| Linear Expansion | x 10-6 in/in/°F | — | 7.2 | 7.5 | 7.5 |
| Thermal Conductivity | Btu/ft/h °F | 8.7 | 9.3 | 9.8 | 10.4 |
| Thermal Capacity | J/kg °F | 500 | 530 | 560 | 590 |
| Electric Resistivity | micro-ohms•meter | 0.80 | 0.85 | 0.90 | 1.00 |
Mechanical Properties
| Minimum values (.625" Plate) | Typical values (.625" Plate) | ||
|---|---|---|---|
| 0.2% Offset Yield Strength | ksi | 65 | 69 |
| Tensile Strength | ksi | 94 | 101 |
| Elongation | % | 30 | 38 |
| Hardness (Brinell) | HB | 290 (max) | 225 |
One of the advantages of nitrogen-enriched duplex stainless steels is their higher strength levels in comparison to conventional austenitic stainless steels. This allows for construction of units with thinner cross-sections. This weight savings can dramatically reduce the material and fabrication cost of a vessel.
ASME Boiler & Pressure Vessel Code, Section VIII, Division 1, Allowable Stress Values, ksi
| Alloy | 200 °F | 300 °F | 400 °F | 500 °F | 600 °F |
|---|---|---|---|---|---|
| LDX 2101 | 26.9 | 25.6 | 24.7 | 24.7 | 24.7 |
| 304L | 20.0 | 18.9 | 18.3 | 17.5 | 16.6 |
| 316L | 20.0 | 20.0 | 19.3 | 18.0 | 17.0 |
| 2205 | 25.7 | 24.8 | 23.9 | 23.3 | 23.1 |
| 2304 | 24.0 | 22.5 | 21.7 | 21.3 | 21.0 |
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.
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.
PREN = %Cr + 3.3Mo + 30N
The following chart compares the PREN for LDX 2101 with other common stainless steels.
Pitting Resistance Equivalent PREN = %Cr + 3.3Mo + 30N
