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12-2020

IPCO 1400SAF: Duplex stainless steel

IPCO 1400SAF

Duplex stainless steel

Belt grade characteristics

Forms of supply

IPCO 1400SAF is a high alloy duplex stainless steel.
For service in corrosive environments, characterised by:• Very good corrosion resistance• Good static strength• Good fatigue strength• Fair wear resistance• Good weldability

The belts are, as standard, delivered in a cold rolled condition
with a mill finish and have well-rounded edges. If required
practically any surface finish can be supplied. Perforated
belts are also available.
The belts are levelled and straightened to obtain optimal
flatness and straightness. The belts can be supplied in open
lengths, with the ends prepared for welding on site, or inendless condition with a welded joint.

IPCO 1400SAF is a high corrosion resistance steel withvery good reparability. This makes it suitable for chemical
processes which ordinary steel can not stand.

For tracking, the belts can be provided with V-ropes, either
rubber or in the form of a specially designed steel spiral. If
required, the product side of the belt can be fitted withretaining strips to keep the conveyed material on the belt
or with transverse flights to prevent material from sliding
backwards when the belt is steeply inclined.

Chemical composition (Typical), %CSiMnCrNiMoN< 0.030< 1.0< 2.022

5

30.18

Different tolerance grades are available to ensure that thebest belt can be selected from an economic point of view.
Standards

Recommendation and advice are available from your local
IPCO Office.

EN

1.4462ASTM

UNS S31803

Mechanical properties
Static strength
PositionYield strength

Tensile strength

MPaksiMPaksiElongation

Weld factor

Hardness

A5 (%)

Rm /Rm

HV5Parent material

1 010

146

1 400

Transverse weld

870

126

    940203

100.67350

136  5Limitation: Operations above 250 ºC (482 ºF) is not recommended for IPCO 1400SAF. Contact your local IPCO office for technical assistance.

Impact properties
IPCO 1400SAF has good impact strength and is suitable for
operations down to -50 ºC (-58 ºF).

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Dynamic strength
The fatigue limit is defined as the reverse bending stressat which 50 % of the test specimen withstand a minimumof 2x106 load cycles. These values refer to 20 °C (68 °F), anormal dry atmosphere and standard prepared specimen.
The fatigue limit for the parent material is approximately± 440 MPa (63 ksi).

IPCO 1400SAF: Duplex stainless steel

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Physical properties

Pitting and crevice corrosion
Chloride ions in a neutral or acidic environment promotes
local breakdown of the passive layer. As a result, pitting
and crevice corrosion can propagate at a high rate, causing
corrosion failure in a short time.

Density, ρ, at 20 °C (68 °F)
7 800 kg/m³, 0.28 lb/in³
Modulus of elasticity, E, at 20 °C (68 °F)
200 000 MPa (29 000 ksi)
Thermal conductivity, λTemp

°C

20

100

200300°F

68

212

392

572

W/mK

14161719

Btu/ft h °F

891011Specific heat capacity, Cp
Temp

°C

20

100

200

300°F

68

212

392

572

kJ/kgK

0.48

0.50

0.53

0.55

Btu/lb °F

0.12

0.12

0.13

0.13°C

20 –100

20 – 200

20 –300°F

68 –21268 – 392

68 – 572

10-6/ °C

13.0

13.5

1410 / °F

7.0

7.5

8-6

Stress corrosion cracking
Stress corrosion cracking (SCC) is a brittle failure mode causedby the combined effect of mechanical stress in a corrosive
environment and normally at elevated temperature. SCC
is often initiated by a localized corrosion attack (pitting orcrevice attack). Standard austenitic stainless steels containing
less amount of molybdenum are more sensitive to SCC thanother types of stainless steels.
IPCO 1400SAF has a very good resistance to stress corrosion
cracking due to its duplex microstructure of austenite andferrite where the ferrite phase is the continuous phase.

Thermal expansion, αTemp

Resistance to pitting and crevice corrosion increases with anincreasing content of chromium, molybdenum and nitrogenin the steel grade. Consequently, 1400 SAF has a great
resistance to pitting and crevice attacks. To make a roughranking of different stainless steels the PRE (Pitting Resistance
Equivalent) formula is used, PRE = %Cr + 3.3 x %Mo + 16 x %N.
IPCO 1400SAF has a PRE of 35, in comparison IPCO 1200SA
has a PRE of 18 and IPCO 1000SA has a PRE of 24.

Resistivity, ρ at 20 °C (68 °F)
0.74 μΩm

Intergranular corrosionIPCO 1400SAF has a low carbon content and thereby a highresistance to intergranular corrosion.

Welding
The weldability of IPCO 1400SAF is good. Suitable welding
method is TIG. Preheating or post heat treatment is notnecessary. Matching welding wire of type IPCO 1400SAF isrecommended.

Magnetic properties
Remanence, Br

0.125 Wb/m2

Coercive force, Hc

1 420 A/m

Hardness HVMax relative permeability, μr52500

IPCO 1400SAF has a thermal expansion close to carbon steel
which makes it less sensitive to temperature differences inthe belts. As the steel is cold rolled, recovery takes place atelevated temperatures.

Corrosion resistance
Uniform corrosion
Uniform corrosion occurs when all, or at least a large sectionof the passive layer on the surface is dissolved. This typicallyoccurs in acids or in hot alkaline solutions.

400

300

200

100-10-50mm from weld centre

510Figure 1. Example of hardness profile across a transverse weld in a IPCO
1400SAF belt.

IPCO 1400SAF is a steel grade that is highly alloyed of theelements chromium, molybdenum and nitrogen which provides
enhanced reinforcement of the passive layer of the surface.

Data given in this document are nominal values and are not guaranteed. Information relating to material, specifications, properties and/or performance isintended as guidance on determining suitability, and may be subject to change without notice.

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