Grates and charging systems

Base grid / Base tray

Base trays form the "basis" of almost every type of furnace. They are used directly as charge carriers or in connection with fixture structures and as charging fixtures made of high-alloyed steel cast. Lohmann manufactures base trays in a wide variety of different sizes and has numerous models available.
The product range extends from individual parts with sizes of up to 1400 x 1600 x 130 mm to mass production series containing several 1000 parts.
Our products (hardening equipment, hardening accessories) are used in particular in chamber furnaces, pusher-type furnaces, vacuum furnaces, industrial furnaces, conveyor furnaces, and shaft furnaces.

Stackable grid / Stackable tray

Stackable trays that are customized to meet the requirements profile are used in the mass production of transmission parts in particular. As a supplier for hardening shops with their own design departments, Lohmann offers its customers support as early as the planning phase. Our customers appreciate our consulting and engineering services for these charging components made of heat-resistant cast steel.
We would be pleased to "develop" tailor-made solutions for your process as well.

Charging fixtures

Charging systems, being the link between the workpieces to be treated and the furnace, straightening machine, or everything in between, play an especially important role. We manufacture base grids, top grids, and charging supports made of heat-resistant steel in standard dimensions based on a modular design or according to the customer's individual requirements. Through intensive dialogs between users and foundries, it is possible to develop the most economical solution by optimally adapting the charging fixtures to the (usually) fully automatic production process.

Baskets and meshes

Baskets

Our cast baskets are characterized in particular by their extreme durability. We offer a wide range of standard baskets. Custom baskets are also possible, in which case they are individually adapted to the customer requirements. Our baskets are finished using the mesh of your choice. We can also overhaul or repair your baskets at our facilities, of course.

Meshes

To be able to fulfill the large number of different requests from our customers, Lohmann maintains a comprehensively stocked warehouse of meshes in different qualities and mesh sizes. We can also deliver pressure welded gratings, perforated sheets, and expanded metal.

Pit furnace fixtures

Pit furnace fixtures

Pit furnace fixtures are a particular strength of Lohmann. We are able to offer our standardized, third generation shaft furnace fixtures in diameters from 650 to 2000 mm without modeling costs. These fixtures are characterized especially by their low empty weight in combination with a high loading capacity as well as enormous flexibility. We naturally will provide all necessary load curves as well as the corresponding CE Declaration of Conformity. Crack testing as well as functional testing and, if necessary, servicing are also part of the Lohmann portfolio of services offered.

Cast link belts

Cast link belts

Cast link belts and furnace conveyor belts for the high and low temperature range can be delivered as finished components for continuous furnaces. The individual links are formed according to the customer's requirements with breakouts, overlaps, bars, cams, or curves according to the process technology and quality of the heat treatment process. Our offer is rounded off by ready-to-install drive and deflection rollers as well as conveyor rollers.
If desired, we can also give your cast link belt a general overhaul in our facilities.

Furnace drums

Furnace rolls

We manufacture a number of different furnace rollers in a wide variety of diameters and lengths. From a single part to mass-produced parts and a wide range of materials, almost every design of furnace roll is possible. 

Furnace accessories

Support beams/lifting beams, fan impellers, radiant heating tubes

Lohmann offers furnace accessories such as slotting heads, support beams, lifting beams, fan impellers, chain guides, rollers, and radiant heating tubes for a whole range of different furnace types.

Anchors for fireproof linings

Anchors for fireproof linings

A number of anchors, brackets, and threaded studs are needed to produce refractory linings in industrial furnaces. Lohmann also offers a wide range of products made of various materials for this area, too.

Material table

Norm
Werkstoff‑Nr.

Standard
Material No.
Lohmann
Werkstoff‑Nr.

Lohmann
Material No.
Werkstoff Bezeichnung
Material Designation
Hauptlegierungselemente
in Masse‑%
Richtanalyse

Main alloy elements in mass %
Componential analysis
höchste Anwendungstemperatur in Luft in °C
highest
application temperature
in the air in °C
Versprödungsbereich °C
Embrittlement range °C
Beständigkeit gegenüber Gasen
Resistance to gases
C Si Cr Ni Sonstige
Other
400–500 600–900 schwefelig
(reduzierend) a)
stickstoffhaltig
sauerstoffarm b)
carburazione c)
1.4710 1.4710 GX30CrSi7 0,3 1,8 7 750 0 0 +++ + +
1.4729 1.4729 GX40CrSi13 0,4 1,8 13 850 0 0 +++ + +
1.4740 1.4740 GX40CrSi17 0,4 1,8 17 900 + + +++ + ++
1.4743 1.4743 GX160CrSi18 1,6 1,8 18 900 + ++ +++ + ++
1.4745 1.4745 GX40CrSi24 0,4 1,4 24 1050 + ++ +++ + ++
1.4776 1.4776 GX40CrSi28 0,4 1,8 28 1150 + ++ +++ + ++
1.4777 1.4777 GX130CrSi29 1,3 1,8 29 1100 + ++ +++ + ++
1.4823 1.4823 GX40CrNiSi27-4 0,4 1,8 27 4 1100 + ++ ++ ++ ++
1.4825 1.4825 GX25CrNiSi18-9 0,25 2,0 18 9 900 0 0 + ++ ++
1.4826 1.4826 GX40CrNiSi22-10 0,4 2,0 22 10 950 0 + + +++ ++
1.4832 1.4832 GX25CrNiSi20-14 0,25 2,0 20 14 950 0 0 + ++ ++
1.4837 1.4837 GX40CrNiSi25-12 0,4 2,0 25 12 1050 0 + + ++ ++
1.4840 1.4840 GX15CrNi25-20 0,15 1,3 25 20 1100 0 + + +++ ++
1.4848 1.4848 GX40CrNiSi25-20 0,4 2,0 25 20 1100 0 + - +++ ++
1.4805 1.4805 GX35NiCrSi25-21 0,35 1,8 21 25 1000 0 0 + +++ ++
1.4806 1.4806 GX40NiCrSi35-17 0,4 2,0 17 35 1000 0 0 - +++ +++
1.4807 1.4807 GX40NiCrSiNb35-18 0,4 2,0 18 35 Nb 1000 0 0 - +++ +++
1.4849 1.4849 GX40NiCrSiNb38-19 0,4 2,0 19 38 Nb 1020 0 0 - +++ +++
1.4852 1.4852 GX40NiCrSiNb35-26 0,4 2,0 26 35 Nb 1100 0 0 - +++ +++
1.4855 1.4855 GX40CrNiSiNb24-24 0,4 2,0 24 24 Nb 1050 0 0 - +++ ++
1.4857 1.4857 GX40NiCrSi35-26 0,4 2,2 25 35 1100 0 0 - +++ +++
1.4859 1.4859 GX10NiCrSiNb32-20 0,1 1,2 20 32 Nb 1050 0 0 - +++ +++
1.4865 1.4865 GX40NiCrSi38-19 0,4 2,0 19 38 1020 0 0 - +++ +++
1.4869 1.4869 GX50NiCrCoW35-25-15-5 0,5 1,8 25 35 Co, W 1200 0 0 + +++ +++
1.4874 1.4874 GX50NiCrCo20-20-20 0,5 0,8 20 20 Co, W, Nb 1150 0 0 + +++ +++
1.4889 1.4889 GX40NiCrNb45-35 0,4 1,5* 35* 45 Nb 1160 0 (+) - +++ +++
2.4680 2.4680 G-NiCr50Nb 0,1 0,8 50 50 Nb 1050** 0 0 + ++ ++++
2.4778 2.4778 G-CoCr28 0,12 1,0 28 50 Co 1200*** 0 0 ++ +++ ++
2.4815 2.4815 G-NiCr15 0,4 1,8 15 60 1100 0 0 + +++ +++
- 2.4851 G-NiCr23Fe 0,08 0,5 23 60 Al, Ti 1200 0 0 + +++ +++
2.4879 2.4879 G-NiCr28W 0,4 1,8 28 48 W 1150 0 0 - +++ ++++
- 3.4848 GX15CrNiSi25-20 0,15 2,0 25 20 1100 0 + - +++ ++
- 4.4848 GX40CrNiSiNb25-20 0,4 2,0 25 20 Nb 1100 0 + - +++ ++
- 4.4879 G-NiCr28W 0,25 1,8 28 48 W 1150 0 0 - +++ ++++
- 4.4952 G-NiCr22Al 0,2 0,7 22 75 Al, Ti, Zr 1150 0 0 - +++ ++++
- 5.4848 GX20CrNiSiNb25-20 0,2 2,0 25 20 Nb 1100 0 + - +++ ++
- 5.4849 GX15NiCrSiNb38-19 0,15 2,0 19 38 Nb 1020 0 0 - +++ +++
- 5.4865 GX20NiCrSi38-19 0,2 2,0 19 38 1020 0 0 - +++ +++
- 6.4849 GX25NiCrSiNb38-19 0,25 2,0 19 38 Nb 1020 0 0 - +++ +++
* bei Betriebstemperatur < 1000°C mit abgesenktem Cr- und Si-Gehalt / at operating temperature < 1000°C with lowered Cr- and Si-concentration a) sulphurous (reductive)
** bei Ölascheangriff max. 950°C / at oil ash attack max. 950°C b) nitrogenous / oxygen low
*** für zyklische Erwärmung max. 1100°C / for cyclical heating max. 1100°C c) carburize
0 = keine Versprödung / no embrittlement + = Versprödung / embrittlement ++ = Versprödung in kurzer Zeit / embrittlement after short time
++++ =sehr hoch / very high +++ = hoch / high ++ = mittel / medium + = gering / low - = sehr gering / very low

Lohmann
Werkstoff‑Nr.

Lohmann
Material No.
mechanische und physikalische Eigenschaften / mechanical and physical properties Verwendungshinweise
Application note for further use
mittlere Spannung O1% in MPa für
1% Dehnung nach 10000 h bei °C

medium tension O1% in MPa for
1 % expansion after 10000 h at °C
Wärmeausdehnung 10-6 · K-1
zwischen 20°C und °C

Thermal expansion 10-6 · K-1
between 20 °C and °C
spezifische Wärme
J / (kg · K) bei °C

specific heat
J / (kg · K) at °C
Wärmeleitfähigkeit W/(m·K) bei °C
Thermal conductivity W/(m·K) at °C
600 700 800 900 1000 1100 400 800 1000 20 20 100 800 1000
1.4710 19 8 2,5


12,5 13,5
460 24


für geringe mechanische Beanspruchung, Beständigkeit
gegenüber schwefeligen Gasen /
for low mechanical strain, durability against sulphuric gases
1.4729 22 9 3,5 1

12,5 13,5
460 24 24,8 30
1.4740 22 9 3,5 1

12,5 13,5
460
20

1.4743 25 10 4 1,5

12,5 13,5
500 18,8


1.4745 22 9 3,5 1

12,5 14 16 500 18,8


1.4776 26 11 5 1,5

11,5 14 16 500 18,8 21

1.4777 26 11 5 1,5

11,5 14 16 500 18,8


1.4823 28 15 8 4 1
13 14,5 16,6 500 16,7 21 35 39,6 für mittlere mech. Beanspruchung bei mgl. Dauertemp. > 900°C/ 1)
1.4825 78 44 22 9

17,4 18,3 18,8 500 14,8 15,5 26 30 für hohe mech. Beanspruchung und hoher Zähigkeit bei
Temperaturen > 950°C, gute Temperaturwechselbeständigkeit /
for high mechanical strain and high viscosity at stable temperature
above 950°C, good resistance to thermal shocks
1.4826 82 46 23 10

17,2 18,3 18,8 500 14 15 25,4 28,8
1.4832 82 46 23 10

17,2 18,3 19,3 500 14 15 25,4 28,8
1.4837
50 26 13 6
17,5 18,4 19,3 500 14 15 25,4 28,8 für hohe mech. Beanspruchung bei möglichst
Dauerbeanspruchung > 900°C /
for high mechanical strain at stable temperature
above 900°C
1.4840
45 21 10 5
16,5 17,9 18,5 500



1.4848
65 36 17 7 2,5 17 18 19 500 14,6 16,7 25 28
1.4805
80 45 22 7,5
16,4 17,5 18,2 500
14 23,8 27,7 für sehr hohe mech. Belastbarkeit und für hohe Zähigkeitsanforderungen
bei Temperaturwechselbelastung bis ca. 1100°C
for very high mechanical strain and with high requirements on the viscosity
at alternating thermal stress load up to approx. 1100°C
1.4806
80 30 17 6 3 15,3 17 17,6 500 12 12,3 23 26,8
1.4807





15,3 17 17,6 500 12 12,3 23 26,8
1.4849
60 38 20 8
15,3 17 17,6 500 12 12,3 23,3 26,5
1.4852
72 41 22 9 3 16 17,8 18,6 500 12,8 13 23,5 27,7
1.4855
80 46 22 7,5
16,8 18 18,5 500 14 15,5 24,5 27,7
1.4857
70 40 20 8
15,7 17,4 18,3 500 12,8 13 23,8 27,7
1.4859
64 36 15,5 5
17,6 18,7 19,5 500 12,8 13 23,8 27,7
1.4865
55 32 18 7 3 15,3 17 17,6 500 12 12,2 23,3 26,5
1.4869



17 6

17,3 500 10 12,6
28
1.4874


27 17
15,2 16,5 17 460
13,8 25
1.4889



8
14,3 15,3 15,7 500
11,3 30,6 36,1
2.4680
71 38 18 6,8
13 15 15 450 14,2


für höchste Temperaturbelastung bis ca. 1200°C,
hervorragende Temperaturwechsel- und Zunderbeständigkeit in
oxidierender Atmosphäre /
for highest thermal stress up to approx. 1200°C,
excellence resistance to thermal fatigue stress and resistance to
scaling in oxidising atmosphere
2.4778
70 34 16 9,5 4 15 16 17 500 8,5
21
2.4815





13,3 15,3 16,5 460
12,5 24 27,5
2.4851





14,8 16,7 17,7 450 11,3


2.4879
70 41 22 10 4 14,4 15,7 16,3 500 11 11,3 30,6 36,1
3.4848
63 34 16 6 2 17 18 19 500 14,6 16,7 25 28 für höhere Zähigkeit vs. 1.4848 / for higher viscosity vs. 1.4848
für höhere Temperaturwechselfestigkeit vs. 1.4848 /
for higher thermal shock resistance vs. 1.4848
wie 2.4879, jedoch mehr Zähigkeit /
like 2.4879, but with more viscosity
4.4848
66 37 18 8 2,5 17 18 19 500 14,6 16,7 23,8 11,3
4.4879
70 41 22 10 4 14,4 15,7 16,3 500 11 11,3 30,6 36,1
4.4952













für höchste Temperaturbelast. u. hoher Aufkohlungsbeständigkeit / 2)
5.4848
63 34 16 6 2 17 18 19 500 14,6 16,7 25 28 wie entsprechende Normwerkstoffe, jedoch mit verbesserterTemperaturwechselbeständigkeit und Zähigkeit /
like the corresponding standard material, but with revised resistance
to thermal fatigue stress and viscosity
5.4849
60 38 20 8
15,3 17 17,6 500 12 12,3 23,3 26,5
5.4865
55 32 18 7 3 15,3 17 17,6 500 12 12,2 23,3 26,5
6.4849
60 38 20 8
15,3 17 17,6 500 12 12,3 23,3 26,5

1) for medium mechanical strain at stable temperature above 900°C

2) for highest thermal stress and high resistance against carbonisation