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| For the Urea / Fertilizer Industry . Material No. 1.4429 |
Steel Material 1.4429 is a fully austenitic steel with an extremely low Carbon content. Like Material No. 1.4465 this steel has a guaranteed low Ferrite content, and it is used particularly in equipment of Urea plants which is likely to be subjected to corrosion.
1. Material description DIN X 2 Cr Ni Mo N 17-13-3
Material No. (1.4429)
AISI (316LN)
BS 316 S 12
2. Supply form and condition seamless tubes, pickled
sheets, strips, rods, forgings
3. Range of dimension (Tubes) Outside diameter ...... . . .10-114 mm
Wall Thickness ...... ...... ...... ...... ...... ...... . . . . 1-12 mm
Length ...... ...... ...... ...... ...... ...... ...... . . . . max. 18 m
depending on diameter and wall)
4. Physical properties
Density 7.95 g/cm_
Electrical resistance 0.75 Ohm – mm_/m
Thermal conductivity 15 W/m°C
5. Heat treatment
Quench annealing: 1150-1050 °C/water
6. Welding
The weldability of Material No. 1.4429 is as good as that of the known austenitic Cr-Ni-Mo steels. The TIG process and welding with rod electrodes are mainly used as welding processes. Welding additives, specially designed for this steel, are available, which produce
a weld with limited, Ferrite content and low corrosion rates at the Huey-test. Heat treatment (pre-or subsequent heating) is generally not necessary. The heat input during welding should be kept to a miniumum.
7. Cold bending
After cold bending to the usual bending radii heat treatment is not necessary.
At a higher degree of deformation and operational conditions, which may suggest danger of stress corrosion cracking, heat treatment at 1150-1050 °C with quenching is recommended.
8. Hot bending
The working tempertures should be in the region of 1150-750 °C and the parts should be quenched as quickly as possible after hot forming. Annealing is generally not necessary after the bending.
9. Corrosion resistance
a) Because of the special chemical composition and special procedures during production a better intercrystalline corrosion performance and a lesser corrosion rate in Carbamate solutions and at the Huey-test are obtained than with 316 L. The very low Ferrite content has also a decisive influence on the good corrosion performance.
b) Huey (Test Corrosion Rate)
max. 0,6 mm/y (13 g/m2 24 h)
10. Application
In Urea plants Material No. 1.4429 is used in particular for the scrubber, condenser and line pipes. |
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