A NEW COLD WORK PM-GRADE COMBINING HIGH WEAR RESISTANCE WITH HIGH DUCTILITY

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2 A NEW COLD WORK PM-GRADE COMBINING HIGH WEAR RESISTANCE WITH HIGH DUCTILITY By Magnus Tidesten, Anna Medvedeva, Fredrik Carlsson and Annica Engström-Svensson UDDEHOLMS AB

3 Uddeholm Vanadis 8 SuperClean The next generation of Powder Metallurgical Tool Steel

4 INCREASING DEMANDS IN THE AUTOMOTIVE INDUSTRY The new advanced high strength steels are more difficult to cut and form, driving the development of new tool steels A good combination of wear resistance and ductility is needed for long tool life and to avoid breakage of tools

5 UDDEHOLM VANADIS 8 A BALANCED COMBINATION OF ABRASIVE WEAR RESISTANCE CHIPPING RESISTANCE MACHINABILITY

6 AGENDA Chemical composition Carbides Heat treatment response hardenability Ductility Wear resistance Positioning Machinability Application tests Conclusions 6

7 NOMINAL CHEMICAL COMPOSITION Steel grade C Si Mn Cr Mo V New generation steels Uddeholm Vanadis Uddeholm Vanadis 4 Extra Old generation steels Uddeholm Vanadis Uddeholm Vanadis

8 CARBIDES Uddeholm Vanadis 8 Uddeholm Vanadis 4 Extra Uddeholm Vanadis 6 Uddeholm Vanadis 10 Steel MC % (2800 HV) M 7 C 3 % (1700 HV) Vanadis Vanadis 4 Extra 9-9 Vanadis Vanadis Total carbide content %

9 Hardness (HV10) HARDENABILITY. T A =1020 C Uddeholm Vanadis Uddeholm Vanadis Cooling time between C (s)

10 Unnotched impact energy (J) DUCTILITY - UNNOTCHED IMPACT SPECIMENS IN TRANSVERSE DIRECTION % + 50% Hardness (HRC) CR2

11 Wear rate (mg/min) ABRASIVE WEAR RESISTANCE, PIN-ON-DISC TEST, AL 2 O 3 - AND SIO Al2O3 SiO2 5 0 VANADIS 4 EXTRA VANADIS 6 VANADIS 10 VANADIS 8

12 VANADIS 10 AGAINST AL 2 O 3 AND SIO 2 Against P800 Al 2 O 3 Against P150 SiO 2

13 POSITIONING AT 60 HRC

14 V30-value (m/min) MACHINABILITY IN DELIVERED CONDITION Vanadis 8 Vanadis 6 Vanadis 10 Tool: Coromant S4 SPGN Feed, f: 0,126 mm/r Depth of cut, a: 1,0 mm Turning with uncoated carbide Cutting speed for 30 minutes tool life and 0,3 mm flank wear

15 Machined volume (cm 3 ) MACHINABILITY IN HARDENED CONDITION V4E, 61 HRC V6, 61 HRC V8, 62 HRC V10, 62 HRC Cavity milling with solid carbide

16 APPLICATION TEST - BLANKING IN 1400 M (AHSS) Application: Dimensions: Work material: Thickness: Rm: Punch Ø 9,8 mm Docol 1400 M (AHSS) 1,0 mm 1500 MPa Steel grade Vanadis 8 Vanadis 10 Surface treatment None None HRC Failure Abrasive wear Abrasive wear mechanism and Chipping Tool life > strokes strokes

17 APPLICATION TEST - BLANKING OF HARDENED STRIP STEEL Application: Dimensions: Work material: Thickness: Rm: Punch & Die 100 x 50 x 30 mm Hardened Strip Steel 0,8 mm 1570 MPa Steel grade Reference Reference Test Vanadis 4 Extra Vanadis 10 Vanadis 8 Surface treatment None None None HRC Failure mechanism Wear Chipping None Tool life strokes < strokes (tool replaced) (cracked) (still running)

18 APPLICATION TEST - BLANKING OF HIGH STRENGTH CARBON STEEL Application: Dimensions: Work material: Thickness: Rm: Die 200 x 30 x 250 mm Carbon steel 0,4 mm 800 MPa Steel grade Reference Reference Test Vanadis 4 Extra Vanadis 10 Vanadis 8 HRC Failure mechanism Wear Chipping/Wear Wear Tool life strokes strokes strokes Noice reduction pad

19 CONCLUSIONS Uddeholm Vanadis 8 has a combination of very high ductility and wear resistance both Vanadis 6 and Vanadis 10 can be exchanged The effect of Cr-carbides on wear resistance is limited and ductility is reduced High hardenability due to a higher Mo-content in the matrix The machinability is enhanced by the refined microstructure Measured properties are verified in application tests Uddeholm Vanadis 8 is an optimized and ideal steel for long run tooling of High Strength Steels

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21 THANK YOU!

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