Centralloy® ET 45 Micro

Schmidt + Clemens Group
Centralloy ET 45 Micro
®
material data sheet
Designation: GX45NiCrSiNb45-35
Data Sheet for information only · September 2009, Rev. 02 · © Copyright Schmidt + Clemens GmbH + Co. KG
Schmidt + Clemens GmbH + Co. KG · Edelstahlwerk Kaiserau · P.O. Box 1140 · 51779 Lindlar, Germany
Centralloy® ET 45 Micro
Contents:
Product Forms
Features, Product Forms,
Chemical Composition, Applications . . . . . . . . . . . . . . . . 2
Centralloy® ET 45 Micro was designed as centrispun tube material to meet specific design criteria in terms of carburisation and
oxidation resistance, creep rupture strength and weldability. It is
available as centrispun tubes, vertically spun, statically cast and
investment cast product forms.
Physical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Mechanical Properties . . . . . . . . . . . . . . . . . . . . . . . . . 4
Carburisation, Oxidation Resistance . . . . . . . . . . . . . . . . 5
Other forms may be supplied upon request. Further information
regarding these topics and maximum und minimum sizes, may
be obtained from the sales department.
Parametric Stress Rupture Strength . . . . . . . . . . . . . . . . 6
Parametric Minimum Creep Rate,
Manufacturing Characteristics,
Health and Safety Information . . . . . . . . . . . . . . . . . . . . 7
Chemical Composition(*)
mass percentage
Centralloy® ET 45 Micro is an air melted nickel-base alloy consisting essentially of a Ni-Cr-Fe-Si matrix. The high chromium
level, rare earth additions and primary carbide formation provide
the best compromise between good high temperature corrosion
resistance and high temperature creep rupture strength.
Carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.45
Silicon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.60
Manganese . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00
Chromium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.00
Iron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.00
Niobium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00
Titanium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Additions
Zirconium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Additions
Rare earth elements . . . . . . . . . . . . . . . . . . . . . . . . Additions
Nickel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Balance
The presence of carbon leads to the formation of a series of
carbides:
(*) This is a typical composition which may be slightly modified
according to the application.
a) Intergranularly occuring primary carbides, nitrides or carbonitrides of general form M(C,N) where M is usually niobium,
titanium and zirconium. These greatly affect the generation
of good high temperature properties. The phase is visible in
unetched micro specimens, its color varying from the orange/
yellow of the nitride to the grey/mauve of the carbide.
b) C
hromium-rich intergranular carbides of the M7C3 and M23C6
types. These carbides have a profound influence on properties
due to the decomposition and re-precipitation reactions in
service producing secondary carbides in a rather uniform dispersion. By this mechanism dislocation movement is impeded
with the result of significant strengthening at elevated temperatures.
2 Centralloy® ET 45 Micro GX45NiCrSiNb45-35
Applications
Tubular systems requiring superior carburisation and oxidation
resistance combined with high creep rupture strength and high
creep resistance. No heat treatment is required for most applications of this alloy. Main high temperature applications for the
material are:
Process:
max. operating temperature, °C
Steam cracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1150
Direct reduction of iron ore. . . . . . . . . . . . . . . . . . . . . . . 1150
Young’s Modulus, GPa
Features
Coefficient of Thermal Expansion, 10 -6/K
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Physical Properties
Density: 8.1 g/cm3
Thermal Conductivity (20°C): 14.0 W/mK
Mean Coefficient of Linear Thermal Expansion
Coefficient of Thermal Expansion, 10 -6/K
Coefficient of Thermal Expansion, 10-6/K
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
14.5
0
200
400
600
800
1000
1200
800
1000
1200
Temperature, °C
Young‘s Modulus of Elasticity
Temperature, ϒC
160
Young‘s Modulus, GPa
Young’s Modulus, GPa
150
140
130
120
110
100
90
0
200
400
600
Temperature, °C
GX45NiCrSiNb45-35 Centralloy® ET 45 Micro 3
Temperature, ϒC
Centralloy® ET 45 Micro
Mechanical Properties
(only for wall thickness less than 25 mm in the as cast condition)
Tensile properties
Minimum tensile properties at 20°C:
0.2% Yield strength:
Ultimate tensile strength:
Elongation (l = 5d):
245 MPa
450 MPa
6% for centricast tubes
3% for static castings
Typical Tensile Strength and 0.2% Yield Strength vs. Temperature
350
300
Strength, MPa
250
200
150
100
50
0
700
Ultimate Tensile Strength
0.2% Yield Strength
750
800
850
900
950
1000
950
1000
Temperature, °C
Typical Tensile Test Elongation vs. Temperature
50
Temperature, ϒC
Elongation (l=5d), %
40
30
20
10
0
700
750
800
850
Temperature, °C
4 Centralloy® ET 45 Micro GX45NiCrSiNb45-35
Temperature, ϒC
900
Carburisation Resistance
Increase in Carbon Content vs. Temperature after Pack Carburisation
for 260 Hours at Indicated Test Temperature
2.0
2.0
Carbon increase, %
1.5
1.5
1.0
1.0
0.5
0
0.0
1025
1025
1050
1050
1100
1100
1075
1075
1125
1125
1175
1150
1150
Temperature, °C
Oxidation Resistance
Oxidation Weight Loss vs. Temperature for 10 Thermal Cycles in Air
Between Indicated Temperature and Room Temperature
25
7 hours hold time per cycle at test temperature
Weight Loss, mg/cm2
20
15
10
5
0
1000
1025
1050
1075
1100
1125
1150
1175
1200
Temperature, °C
GX45NiCrSiNb45-35 Centralloy® ET 45 Micro 5
Temperature, ϒC
6 Centralloy® ET 45 Micro GX45NiCrSiNb45-35
1
26
10
100
27
28
LMP = Larson Miller Parameter
LMP = T (19.3 + log tr)/1000
Where T: temperature [K] and tr: rupture time [h]
Lower Scatter Band represents 95% confidence level
Average
Lower Scatter Band
29
30
LMP
31
Parametric Stress Rupture
32
33
34
35
Centralloy® ET 45 Micro
Parametric Stress Rupture Strength
Initial Stress, MPa
P= (T+273) (20-log[min. creep rate in % per hour])/1000
Parametric Minimum Creep Rate
33
32
31
30
29
28
27
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
27.5
30.0
32.5
35.0
Initial Stress, MPa
Manufacturing Characteristics
Machining
Temperature, ϒC
In general terms the machinability of Centralloy® ET 45 Micro is
similar to that of other heat resistant alloys.
Welding
For critical, highly stressed and corrosion resistant joints coated
electrodes, flux cored wire and bare filler material are commercially available. These welding consumables have high
strength properties at elevated temperatures with good retained
ductilities. Besides fillerless PAW, TIG and MAW have been used
satisfactorily for component fabrication or repair welding. Preheating and postweld heat treatment of the joint is not necessary.
For dissimilar weld joints to austenitic materials the same filler
materials are recommended. Further information will be supplied
upon request.
Health and Safety Information
The operation and maintenance of welding equipment should
conform to the provisions of relevant national standards for the
protection of personnel.
Mechanical ventilation is advisable, and under certain conditions
in confined spaces, is necessary during welding operations in
order to prevent possible exposure to hazardous fumes, gases,
or dust that may occur.
Nickel- and iron-base materials may contain, in varying concentrations, elemental constitutions of chromium, iron, manganese,
molybdenum, cobalt, nickel, tungsten and aluminium. Inhalation
of metal dust from welding, grinding, melting and dross handling
of these alloy systems may cause adverse health effects.
The information in this publication is as complete and accurate as possible at the time of publication. Variations in properties can occur to production and process routes.
However, no warranty or any legal liability for its accuracy, completeness and results to be obtained for any particular use of the information herein contained is given. Where
possible the test conditions are fully described. Where reference, is made to the balance of the alloy’s composition it is not guaranteed that this balance is composed exclusively of the element mentioned, but that it predominates and others are present only in minimal quantities. The creep rupture data are frequently insufficient to be directly
translatable to specific design or performance applications without examination and verification of their applicability and suitability by professionally qualified personnel. The
primary units for property data are based on those of the SI-system.
GX45NiCrSiNb45-35 Centralloy® ET 45 Micro 7
Schmidt + Clemens Group
Spun Casting – Petrochemical Industry
Germany
Schmidt + Clemens GmbH + Co. KG
Edelstahlwerk Kaiserau
Spain
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Industries
• Petrochemicals
• Iron-ore direct reduction
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