12-2020

IPCO 1850SM: Martensitic high strength chromium alloyed stainless steel belt

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IPCO 1850SM

Martensitic high strength chromium
alloyed stainless steel belt

Belt grade characteristics

Forms of supply

IPCO 1850SM is a high strength steel with excellent mechanicalproperties. This in combination with good corrosion resistancemakes it the ideal choice for a wide range of application.

The belts are, as standard, delivered in a hardened andtempered condition with a mill finish and have well-roundededges. If required practically any surface finish can besupplied. Perforated belts are also available.

The IPCO 1850SM belt grade is a martensitic chromium stainless steel and is characterised by:• Excellent static strength• Excellent fatigue strength• Good corrosion resistance• Good wear resistance• Very good repairability

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. Max width 310 mm
and max thickness 1.2 mm.

Chemical composition (typical), %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.

CSiMnCrMo

0.36

0.40

0.55

13.5

1.0

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

Standards
ENNo standard

AISINo standard

Recommendation and advice are available from your local
IPCO Office.

Mechanical properties
Static length
Standard strength at 20 °C (68 °F), typical values
Position

Proportional limit

Yield strength

MPaksiMPaksiMPaksiParent material

1 250

161

1 450

210

1 800

261

1 170

170

Transverse weld (not heat treated)
Transverse weld (heat treated)Tensile strength

Elongation A(%)

Weld factor

Hardness

Rm /Rm

HV5

0.65

530
**

*See figure on page 2.

Continuous operating temperature of or above 350 ºC is
not recommended for 1850SM, due to embrittlement. If theoperating temperature is above 350 ºC IPCO office should
be contacted for technical assistance.
Impact properties
This belt grade is not recommended for use at low temperatures, e.i. operations below 0 ºC.

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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 2 × 106 load cycles. These values refer to 20 °C (68 °F), a
normal dry atmosphere and standard prepared specimen.
The fatigue limit for the parent materialis approximately± 860 MPa (± 125 ksi).

IPCO 1850SM: Martensitic high strength chromium alloyed stainless steel belt

Physical properties

Pitting and crevice corrosion
The steel may be sensitive to pitting, even in solutions of a
relative low chloride content.

Density, ρ, at 20 °C (68 °F)
7 700 kg/m3, 0.278 lb/in3
Modulus of elasticity, E, at 20 °C (68 °F)
210 000 MPa (30 450 ksi)
Thermal conductivity, λTemp°C

20100200300

400°F

68212392572752

W/mK

24

Btu/ft h °F

14Specific heat capacity, Cp
Temp

°C

20100200300400°F

68212392

572752kJ/kgK

460

460

Btu/lb °F

0.110.11

Stress corrosion cracking
Stress corrosion cracking, although occurring relatively
infrequently, can be cause of failure in stainless steels. Itoccurs at temperature above about 70 °C (160 °F), if the steel
is subjected to tensile stresses and comes into contact withcertain solutions, particularly those containing chlorides.
Hydrogen embrittlement
Hydrogen embrittlement is a potential danger to all highstrength martensitic steels whenever the reduction ofhydrogen ions to atomic hydrogen occurs. If this is the case,contact your local IPCO office.

Welding
IPCO 1850SM. A suitable fusion welding method is gasshielded arc welding, with the TIG method as first choice.
No welding wire is required.

Further information concerning method and equipment etc.
required can be obtained from your local IPCO office.

Thermal expansion, α
Temp

2/2°C

20 – 100

20 – 200

20 – 300°F

68 – 212

68 – 392

68 – 572

10-6/ °C

10.6

11.1

11.4

10-6/ °F

5.9

6.2  6.3Hardness HV
800
700600Magnetic properties
Remanence, Br

0.7 Wb/m2

Coercive force, Hc< 2 500 A/m

Max relative permeability, μr

97

The thermal conductivity of chromium steel is comparable toaustenitic stainless steels, but the thermal expansion is muchlower. This makes this steel less sensitive to thermal strain andbuckling caused by uneven temperature.

500
400
300-5-4-3-2-101mm from weld centre

2345Figure 1. Example of hardness profile across a transverse weld, without
heat-treatment in a IPCO 1850SM belt.

Corrosion resistance
General corrosion
IPCO 1850SM shows a good corrosion resistance in rural andmild industrial atmosphere and less good resistance when
exposed to coastal atmosphere.
It has good resistance to:• Ammonium hydroxide up to boiling point and sodiumhydroxide at low concentrations and temperatures.
IPCO 1850SM is not suitable to use in any concentration ofhydrochloric acid, phosphoric acid, nitric acid and sulphuricacid. IPCO 1850SM is not suitable in any concentration.

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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