1.4335

  • UNS S 31002
  • X1 Cr Ni 25.21
  • 310L NAG

Austenitic stainless steel with sharp control of the residual elements in order to provide high corrosion resistance properties in boiling 50-65% Nitric acid solutions. The silicon content is kept under 0.3% while the carbon content is lower than 0.015%.
Molybdenum additions are also well known to reduce the behaviour of the steel in nitric acid solutions. This explains why the molybdenum content is guaranteed lower than 0.3% . The sharp control of Carbon, Silicon and phosphorus contents makes it possible to produce a more stable austenite microstructure, free of intermetallic or carbide precipitations. The alloy is designed for nitric acid applications.

  • Production of nitric acid,
  • Ammonium nitrate production,
  • Nuclear fuel reprocessing
  • Hydrofluoric pickling.

The grade is not recommended for concentrated nitric acid purposes or highly oxydizing nitric acid solutions (with Cr VI species…)

Mechanical Properties

Tensile strength:470-670N/mm²
Yield strength 0,2% :283≥ N/mm²
Elongation:40≥ %
Hardness Brinell:220≤ HB

Chemical Composition

Carbon

C

0,02% max

Silicon

Si

0,15% max

Magnese

Mn

2,00% max

Phosphorus

P

0,025% max

Sulphur

S

0,005% max

Chromium

Cr

24-26% max

Nickel

Ni

20-22% max

Nitrogen

N

0,10% max

Heat Treatment

1100/1150°C (2010/2100°F) followed by rapid cooling.

Marking

All material will be marked as follow:

  • Manufacturer’s name
  • Material grade
  • Size
  • Heat Number

Certification

Material will be delivered with certificate EN 10204 3.1

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products

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pipes

flanges

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plates

Round Bar, piping material

bars

Forged Fittings, piping material

forged fittings