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Highly wear-resistant screws according to customer needs.

Hard-face flight screws



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Description

The flight is the area under the most strain in a screw. A specifically applied armour coating protects it highly effectively against wear and corrosion.

The armour coating is 1.5 to 3 mm thick on average. It is applied in an automated plasma powder PTA weldingprocess. So that the screw root and the flight flanks are protected as well, the entire screw surface is iron-nitrided.

At greater corrosion exposure the screw root and the flight flanks receive a hard chrome coating. Or an appropriate corrosion-resistant material is used to meet the requirements.

Harden-through screws
We produce highly wear-resistant screw out of PM-HIP alloys that it has developed itself.

The PM-HIP technology permits higher alloy contents as the conventional melt metallurgy. This gives our screw made of PM-HIP rod steel a significantly greater resistanceto wear than screws made of conventional steels.

Of course we also offer hardened-through screws made of standard materials.


Reiloy Technical specifications for hardened-through screws

Essence
material		 Norm 
Bezeichnung		 Hardness [HRC]
 Wear
resistance		 Corrosion
resistance		 Thermal material expansion
(25 - 400 °C) [1/MK]		 Essential alloy elements [Gew.-%]


RT 300°C


Cr V C
R123.6 X230CrVMoW18-6 64 54 • • • • • • 11,7 18,0 6,0 2,3
R123.3 X270CrVMoW17-9 64 54 • • • • • • • 12,1 17,0 9,0 2,7
R123 X220CrVMoW20-4 62 53 • • • • • 11,4 20,0 4,0 2,2


Delivery dimensions Delivery form 
Screws: Ø 14 mm - 70 mm Screws: completely finished according to the customers drawing
PM-HIP steel rods: Ø 25 mm - 70 mm
Herstellungslängen bis zu 4000 mm		 PM-HIP steel rods


Technical specifications for hard-face flight screws

   FE-Basis
Essence
material		 Norm 
description 
 Hardness [HRC]
 Wear
resistance		 Corrosion
resistance		 Thermal material expansion
(25 - 400 °C) [1/MK]		 Essential alloy elements [Gew.-%]


RT 300°C


Cr V C
EC3 X395VCrWMo16-13 56-59 54 • • • • • • • 12,2 13 16 4,0


   CO-Basis
Essence
material		 Norm 
description 
 Hardness [HRC]
 Wear
resistance		 Corrosion
resistance		 Thermal material expansion
(25 - 400 °C) [1/MK]		 Essential alloy elements [Gew.-%]


RT
 300°C
hardened


Cr W Si C
ES6 CoCr28W5 38-41 3 • • • • 13,9 28 5 1,5 0,9
ES12 CoCr27W10 45-48 41 • • • • • 12,9 27 10 1,5 2,0
ES1 CoCr33W13 52-56 48 • • • • • • 12,1 33 13 1,2 2,5


   NI-Basis
Essence
material		 Norm 
description 		 Hardness [HRC]
 Wear
resistance		 Corrosion
wider-
stand		 Thermal material expansion
(25 - 400 °C) [1/MK]		 Essential alloy elements 
[Gew.-%]


RT  300°C


Cr Mo W Co B SI C
EP50 NiCr17Mo16 48-52 49 • • • • • • • 11,7 17 16 6 5 1 1,8 1,1
EP50 Plus NiW20Cr14Mo13 51-55 52 • • • • • • • • 11,4 14 13 20 4 0,8 1,5 1,9


material material 
Nr.		 Yield strength
Rp0,2
[MPa]		 Tensile strength
Rm
[MPa]		 Elongation to fraction
A(I=5d)
[%]		 Surface hardness
after
ion-nitriding HV5 bei RT		 Depth of nitrided zone
[mm]
31CrMoV9 1.8519 780 930 15 720 0,30
X35CrMo17-1 1.4122 470 850 14 1100 0,15
Inconel 625 2.4856 415 870 45 - -


Delivery dimensions Delivery form
Ø 50 mm - 350 mm Screw blanks with armouring, pre-ground
+0,3 mm to nominal dimension
Length max. 9000 mm Screws completely finished according to the customer’s drawing

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