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LDX2101 Duplex Stainless Steel for Pipe and Tube

Penn Stainless can provide tubluar products in Alloy LDX2101 (UNS S32101) given the proper lead time. Please contact us for availability details.

General Properties

LDX 2101, a duplex (austenitic-ferritic) stainless steel, has relatively low contents of alloying elements and high mechanical strength. It has superior  corrosion resistance, putting it at the same level as most standard stainless steel grades. When used in combination, these two attributes can optimize design relative to strength, maintenance, durability and long-term cost effectiveness.

LDX 2101 Characteristics:

  • High strength – approximately twice as high proof strength as austenitic stainless steels ASTM 304 and 316
  • Very good resistance to stress corrosion cracking
  • Good resistance to general corrosion and pitting
  • High energy absorption
  • Physical properties that offer design advantages
  • Ease of fabrication and good toughness
  • Ease of welding

LDX 2101 Sample Applications

  • Building and construction
  • Storage tanks
  • Reinforcement bars
  • Water piping



Corrosion resistance

  • Good corrosion resistance
  • Can be used in a wide range of general-purpose applications and environments.

Pitting and Crevice Corrosion

  • Resistance to pitting and crevice corrosion increases with chromium, molybdenum and nitrogen content
  • Resistance to these types of corrosion is good due to the grade’s high chromium and nitrogen content.

Atmospheric Corrosion

  • Strongly linked to resistance to uniform corrosion and localized corrosion such as pitting and crevice corrosion.
  • LDX 2101 shows sufficient resistance in most environments.

Stress Corrosion Cracking

  • Like all duplex stainless steels, LDX 2101 shows good resistance to chloride-induced stress corrosion cracking (SCC).

Heat treatment

  • Plate, sheet and coil are normally delivered in heat treated condition. If additional heat treatment is needed after further processing the following is recommended.

Solution annealing

  • 1020 -1080°C (1865 -1975°F), rapid cooling in air or water.


Hot forming

  • Hot forming is performed in the temperature range 1100–900°C (2010-1650oF) and should be followed by solution annealing. It should, however, be observed that the strength is low at high temperatures.

Cold forming

  • Due to the high proof strength of duplex material, greater working forces than those required for austenitic steel are usually needed for cold forming.
  • LDX 2101 is suitable for most forming operations used in stainless steel fabrication.
  • Due to the grade’s higher mechanical strength and lower toughness, operations such as deep drawing, stretch forming and spinning are more difficult to perform than with austenitic steel.
  • The grade’s high strength, may give rise to a relatively high spring back.


  • LDX 2101 has a good weldability and can be welded using the same processes used for other duplex steels.
  • In general the recommendations for welding duplex steels also apply for LDX 2101, however, the restrictions in arc energy are less tight than for conventional duplex steels due to the grade’s low alloy content and high nitrogen level.
  • Suitable welding methods are manual metal-arc welding with covered electrodes or gas shielded arc welding. Welding should be undertaken within the heat input range 0.2-2.5 kJ/mm. Preheating or post-weld heat treatment is not normally necessary.

Chemical composition (nominal) %

C Si Mn P S Cr Ni N Mo
0.030 1.0 5.0 0.04 0.03 21.5 1.5 0.22 0.3

Physical Properties

LDX2101 Temperature, ºF
68 200 400 600
Density lb/in3 0.28
Modules of Elasticity x 106 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

LDX2101 Minimum values
(.625″ Plate)
Typical values
(.625″ Plate)
0.2% Yield Strength ksi 65 69
Tensile Strength ksi 94 101
Elongation % 30 38
Hardness (Brinell) HB 290 (max) 225

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