WP7V When tough isn`t tough enough

Properties of cold work steels 42 66 46 50 54 58 62 carbide rich tough hard wear resistance toughness toughness wear resistance hardness in HRc

Cold work steels for forming processes

Structure comparison 1.2080 1.2379 CPOH CP4M WP7V 12,0% Cr 1.2379 1,6% C 12,0% Cr CPOH 1,0% C 8,0% Cr CP4M 0,6% C 5,0% Cr WP7V 0,5% C 7,8% Cr

WP7V Case Studies Application: Shearing Tool, AISI S5 for CK 45, 42CrMo4 DIA 20 – 40 mm Before: Problem: Total Failure Hardness: 57 -58 HRc After: Problem: None Hardness: 58 HRc

WP7V Case Studies Application: Stamping tool K190 PM Plate ST 37-2, 10 mm thick Before: Problem: Failure after 2000 – 3000 shots Hardness: 58 HRc After: Problem: None – regrind after 80.000 – 100.000 shots Hardness: 58 HRc

WP7V Case Studies Application: Punching Tool, WNR. 1.2379 for AP 0,14 (St 14) DIA 20 – 40 mm Before: Problem: Total Failure Hardness: 59 -61 HRc After: Problem: None Hardness: 58 HRc

WP7V Case Studies Application: Punching break pads, CPM® 3V, Carbon steels ca. 400 N/mm2 , 5 mm thick Before: Problem: High cost of powder steels. Hardness: 57 -58 HRc After: Problem: None – upto 40.000 shots. Hardness: 58-59 HRc TRW Group reference grades with max 40.000 shots

WP7V Case Studies Application: Punching brass, working temp., approx. 500ºC The problem: Total failure W321 (1.2885) Without Cooling 6-7 pieces. WP7V Without Cooling Ca. 300 stk WP7V With Cooling (Oil/Air/Graphite) ca. 75000 Stk. 50-52 HRC