HIGH NITROGEN STEELS HNS

Transcription

1 HIGH NITROGEN STEELS HNS

2 THE CONCEPT NITROGEN Why using Nitrogen as alloying element? N increases the strength especially for austenitic steels without a reduction of toughness N stabilizes the austenitic structure N increases the corrosion resistance N 2

3 THE CONCEPT NITROGEN Nitrogen Lower tendency to build grain-boundary segregations Small size and equal distribution of the nitrides => ductile Carbon The cluster formation is a pre-stage of carbides Tendency to build grain-boundary segregations => brittle 4

4 THE CONCEPT NITROGEN Mechanism of action Increase of the interstital solubility Increase of hardenability Avoidance of segregations like M23C6 and M7C3 Sufficient chrome content in the matrix Increase of corrosion resitance 8

5 THE CONCEPT NITROGEN Nitrogen solubility Sieverts: [%N] = /f N x P N2 log f N = e N Cr [%Cr] + e N C [%C] +... e N C Si Ni W Mo Mn Cr V Nb Ti Reduces solubility Increases solubility 9

6 PRODUCTION Nitrogen solubility in normal atmosphere P % Cronidur30 018% Value after increasing nitrogen : P % Cronidur30 038% 10

7 PRODUCTION PESR- unit Crucible: Ø430mm Ø630mm Ø830mm Ø1000mm 2t 7t 13t 20t 11

8 CRONIDUR 30 Chemical analysis- CRONIDUR 30 [Gew.-%] C Si Mn Cr Ni Mo N min max

9 CRONIDUR 30 N Increase of interstitial solubility High hardness ( 58 HRC) C High corrosion resistance 13

10 CRONIDUR 30 Comparison of corrosion resitance Salt spray test (DIN 50021) after 192 h 100Cr6 100Cr6 chrome-plated AISI 440 C / X105CrMo17 CRONIDUR 30 14

11 CRONIDUR 30 Chemical resistance steel comparison Brand Name Material-No. 100Cr Cronidur 30 X46Cr X90Cr MoV X102Cr Mo c Ability to Bearing Steel Medium 20 C Conz. in % Saltwater Salt Acid HCl Sulphuric Acid H 2 SO Nitric Acid HNO Phosphoric Acid H 3 PO Citric Acid C 6 H 8 O Sulphurous Acid H5So

12 CRONIDUR 30 Resistance of CRONIDUR 30 vs. AISI 440C against aggressive mediums Neither CRONIDUR 30 nor 440C are resistant in strong mineral acids. Compared with 440C the CRONIDUR 30 has clear advantages in thin acids. In chloric acids only the CRONIDUR 30 should be used. The 440C shows pitting. 16

13 CRONIDUR 30 Microstructure 100Cr6: Ghost lines AISI440C und M50: Primary Carbides Carbide Stringers CRONIDUR 30: Homogenous structure with fine carbonitrides Max. carbonitirde size: 10µm 17

14 CRONIDUR 30 Structure comparison CRONIDUR 30 magnification 1000x magnification 1000x 18

15 CRONIDUR 30 Wear properties Fine segregated Crcarbonitrides Avoiding of break off of groarse carbides Excellent wear properties 100:1 500:1 1000:1 Material structure in hardened and tempered condition; Hardness: 59 HRC 19

16 CRONIDUR 30 - APPLICATIONS Applications Ball screws and bearings in the aircraft industry as well as in the common mechanical engineering industries Cutter knifes and Portioner- Units in the Food Industry Vanes Spindles Extrusion- und Portioner- Units in the Chemical- and Pharmaceutical Industry Tablet Compression Tools High-Glance Polished forms in the Plastics Industry Shredder knives und Granulating rotors in the Recycling Industry Instruments in the Medical Industry 20

17 CRONIDUR 30 - APPLICATIONS Ball Screw Bearings and Nuts for Aerospace and Industrial Applications high hardness and corrosion resistance under different surroundings and temperatures Ball screws for airbrakes actuation No corrosion issues (road salt / salty sea air) 21

18 CRONIDUR 30 - APPLICATIONS Space Shuttle Main bearing for fuel pump made of CRONIDUR 30 Ten times increase of life time 22

19 CRONIDUR 30 - APPLICATIONS Swash plate bearing for Sikorsky und Eurocopter Diameter up to 1000mm (40 ) 23

20 CRONIDUR 30 - APPLICATIONS Ball bearings Hybrid bearings made of CRONIDUR 30- racers and Silicon-Nitride-ball for gear boxes clutches und wheels (racing). 24

21 CRONIDUR 30 - APPLICATIONS Pressure die casting molds 25

22 CRONIDUR 30 - APPLICATIONS Surgical instruments / dental drills 26

23 CRONIDUR 30 - APPLICATIONS Bottling plants Features water lubrication OR IR made of HNS ceramic balls resistant against water and cleaning fluids Customer benefit no separate lubrication system 3 x longer life time no corrosion 27

24 CRONIDUR 30 - APPLICATIONS Superior Tribological Properties for critical Circumstances Lubrication/ Test Conditions Contact Results Cronidur 30 Stress Pc in MPa Full Lubrication[EHD] Cr 6: L10 = 16h L10 > 260h M50: L10 = 160h Full Lubrication [EHD] Cr 6: L10 = 800h L10 > 3900h M50: L10 = 600h Boundary Lubrication Cr 6: L10 = 55h L10 > 1050h 440C:L10 = 10h Boundary Lubrication and C: L10 = 10h L10 > 240h Corros. Cyclic Test (Salt Spray) Boundary Lubrication and Cr 6:L10 = 35h L10: 500h Artificial Indentations HFA Hydr. Fluid Cr 6: L10 = 57h L10: 570h 440C: L10 = 370h HFC Hydr. Fluid C. L10 = 370h L10 > 4000h 28

25 CRONIDUR 30 - APPLICATIONS Professional Cutlery and Table Holloware with Superior Corrosion-Resistance and Cutting- Performance Material Knife blade after cyclic submerge Cut - out 1 cm x 1 cm X46Cr13 X50CrMoV Detail: 10x10mm Detail: 10x10mm Cronidur 30 Detail: 10x10mm Cyclic Submerge acc. to DIN EN ISO

26 CRONIDUR 30 - APPLICATIONS Cronidur 30 beats all Specifications of DIN Cronidur 30 X50CrMoV15 X46Cr13 Less than 5 Pittings Ø < 0.1 mm and Less than 50 Pittings Ø < 0.05 mm Less than 5 Pittings Ø < 0.1 mm or Less than 50 Pittings Ø < 0.05 mm No Pittings Ø > 0.1 mm No Pittings Ø > 0.4 mm per blade (Minimum standards of RAL RG 604) At most three Pittings Ø < 0.4 mm per 20 cm² no Pittings Ø > 0.75 mm No cracks and no overlapping (Minimum standards of DIN EN ISO ) 30

27 CRONIDUR 30 - APPLICATIONS Knives - market-ready 31

28 CRONIDUR 30 Cutting Ability of Knife Baldes (ICP-Value) Minimum Standard Reference Material X46Cr13 Cronidur 30 / 990 C Cronidur 30 / 1010 C Cronidur 30 / 1050 C Cutting Ability (ICP-Value / mm) 32

29 CRONIDUR 30 Edge Holdingability of Knife Blades (TCP-Value) Minimum Standard Reference Material X46Cr13 Cronidur 30 / 990 C Cronidur 30 / 1010 C Cronidur 30 / 1050 C Edge Holdingability (ICP-Value/ mm) 33

30 CRONIDUR 30 High Corrosive Claimed Cutter Portioner- and Filling-Units in the Food Industry Because of the constant structural condition and homogeneous allocation of nitride and carbonitrides you will reach a superior cutting ability and edge holdingability at high durability. Perforation Equipment Butcher s Knife (Cutter) 34

31 CRONIDUR 30 Vanes Spindles Extrusion- und Portioner-Units in the Chemical- and Pharmaceutical Industry Outstanding tribological properties under boundary lubrication also by additional corrosion demands or artifical indentations. Highly stressed machine components in aggressive media. 35

32 CRONIDUR 30 Plastics Industry High-Glance Polished Cavities in the Plastics Industry outstanding machinability also in hardened condition high dimensional stability after heat treatment optimal surfaces with outstanding polish ability through homogeneous structural conditions and fine distributed hard phases high reliability against hydro-chlorid solutions and hot gas - corrosion (for example PVC-assimilation) Martensitic steel 36

33 CRONIDUR 30 Recycling Industry Shredder knives and granulating rotors in the Recycling Industry high toughness and corrosion resistance against different mediums at moderate wear resistance 37

34 SUMMARY OF FEATURES: Superior corrosion resistance Excellent machinability Dimensionally stable after heat treatment Excellent polishability and grindability to achieve optimal surface finish High hardness and good impact bending energy Good wear-resistance 38