1.4435 – X2CrNiMo18-14-3 – 316L – S31603

1.4435 – X2CrNiMo18-14-3 – 316L – S316032018-06-18T10:16:25+00:00

1.4435

  • X2CrNiMo18-14-3
  • 316L Mod
  • S31603

The UREA 316L grade has been specially developed for urea plant applications. It is a 316L modified stainless steel with extra – low silicon content and substantial higher molybdenum contents. The low carbon content, combined with a well balanced chemistry (low silicon and nickel content close to 14%) makes the alloy fully austenitic, free of intermetallic phase precipitations. The ferrite level is kept under 0.5% in the solution annealing and water quenched conditions. The UREA 316L grade is designed for the fabrication of lining interiors in urea units for improved corrosion resistance properties in urea – carbonate environments or complementary products (pipes, fittings…). The alloy is not designed for nitric acid application.

Mechanical Properties

Tensile strength:500-700N/mm²
Yield strength 0,2% :200≥ N/mm²
Elongation:40/30≥ %
Hardness HB30:215≤ HB

Chemical Composition

Carbon

C

0,020% max

Silicon

Si

0,40% max

Magnese

Mn

2% max

Phosphorus

P

0,045% max

Sulphur

S

0.015% max

Chromium

Cr

17,0-19,0 min

Molybdenum

Mo

2,2-3%

Nickel

Ni

12,5-15,0%

Heat Treatment

at 1120 – 1180°C (2048 – 2156°F) followed by water quenching.

Typical maximum corrosion results required following different specifications after Huey tests (ASTM A262 C – five periods of 48 h.) are:

  • maximum weight loss lower than 3,3 μm/48 h (130 mg/dm² per 24 h.)
  • maximum depth for microcracks of 200 μm in the long direction and 70 μm in the transverse direction.
  • Ferrite check 100% (less than 0,5%)
  • Measurement location chosen by Inspector

Welding The UREA 316L grade can be welded with most of the welding processes: TIG, Plasma, MIG welding, as well as SMAW, SAW or FCAW processes. The alloy is sensitive to hot cracking phenomenon due to its fully austenitic microstructure. Weld should be performed in order to obtain extra – low ferrite contents, no carbide or nitrides precipitations, low silicon contents as well as no intermetallic phases precipitations. Higher manganese content products should be considered.

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

Other UREA grades

EURONORM/DINWERKSTOFF NR.AISIUNSBRAND NAME
X2 CrNiMo 18-14-3 1.4435 316L UG S 31603316L MOD UREA ®
3R60 UREA GRADE
X1 CrNiMoN 25-22-21.4466/1.4465310 MoLNS 3105025.22.2 ®

products

Pipes, piping material

pipes

Flanges, piping material

flanges

Fittings, piping material

fittings

Plates, piping material

plates

Round Bar, piping material

bars

Forged Fittings, piping material

forged fittings