DATA SHEET - ::Crucible Industries:: Home

1 Edge Retention (CATRA Testing Relative to 440C) grade % CPM S35VN145*CPM S30V145154CM120 440C100 The CATRA (Cutlery & Allied Trades Research Association) testmachine performs a standard cutting operation and measures thenumber of silica impregnated cards which are cut. It is considereda measure of relative wear resistance, reported in this table ascompared to a 440C standard.*Estimate based upon market feedbackCRUCIBLELong-Wearing Specialty CutleryPlastic Injection and Extrusion Feed Screws and DiesNon-Return Valve ComponentsPelletizing EquipmentWear Components for Food and Chemical ProcessingNote: These are some typical applications.

2 Your specific application shouldnot be undertaken without independent study and evaluation for CPM S35VN Issue # steel Conventional steel Elastic Modulus32 X 106psi(221 GPa) ( g/cm3)Thermal ConductivityBTU/hr-ft- F W/m- K cal/cm-s- C200 F 93 C 10 X 10-2 Coefficient of Thermal Expansion F Cin/in/ F mm/mm/ C70 - 400 (20 - 200) X10-6( X10-6)70 - 600 (20 - 315) X10-6( X10-6) Tool steel ComparagraphPhysical PropertiesMechanical PropertiesTypical ApplicationsCarbide Type and VolumeVanadiumNiobium Chromium TotalCPM CM0% (TransverseCharpy C-notch Testing)GradeImpact Energy CPM ft.

3 Ft. ft. ft. the longitudinal toughness of all four of these grades isabout 25-28 ft. lbs., the transversetoughness of the CPM grades isfour or more times that of 440C and 154CM. The higher transversetoughness results indicate that CPM S35VN and CPM S30V aremuch more resistant to chipping and breaking in applications whichmay encounter side loading. In knifemaking, the higher transversetoughness makes CPM especially good for bigger CMCPM S30V*vs. Hg/HgO reference electrodeCorrosion Resistance Average Pitting Potential measurements from Polarization Curvesrun in 5% NaCl (Sodium Chloride) Solution at Room Temperature:(Higher voltage pitting potential indicates better corrosion resistance.)

4 Millivolts*440C 154 CM CPM S30V/S35 VNCrucible Industries LLCC rucible Industries, Crucible Industries logo, CPM, 1V, 3V, 9V, 10V, S30V, S35VN, andS90V, are all trademarks of Crucible S35VN is a martensitic stainless steel designed to offerimproved toughness over CPM S30V. It is also easier to machineand polish than CPM S30V. Its chemistry has been rebalancedso that it forms some niobium carbides along with vanadium andchromium carbides. Substituting niobium carbides for some of thevanadium carbides makes CPM S35VN about 15-20% tougherthan CPM S30V without any loss of wear resistance.

5 CPM S35VN simproved toughness gives it better resistance to edge both vanadium and niobium carbides are harder and moreeffective than chromium carbides in providing wear resistance,the CPM stainless blade steels offer improved edge retentionover conventional high chromium steels such as 440C and D2. The CPM process produces very homogeneous, high qualitysteel characterized by superior dimensional stability, grindability,and toughness compared to steels produced by conventionalmelting CPM 3VD2154 CMCPMS30 VCPM M4 CPMS90 VCPM 10 VToughnessWear ResistanceRelative ValuesCPM 440C CPMD2 154 CM CPM CPM CPM CPM S35VN3V S30V M4 S90V 10V 5254565860626466As F600 F1000 F2000 F (1095 C)1950 F (1065C)1900 F (1040 C)

6 DS413 6/10 CPM S35VN Crucible Industries LLC Printed in : 2100 F (1150 C) Do not forge below 1750 F (950 C).Annealing: Heat to 1650 F (900 C), hold 2 hours, slow cool nofaster than 25 F (15 C) per hour to 1100 F (595 C),then furnacecool or cool in still air to room Hardness: About BHN 255 Stress RelievingAnnealed Parts:Heat to 1100-1300 F (595-705 C), hold 2hours, then furnace cool or cool in still Parts: Heat to 25-50 F (15-30 C) below original tempering temperature, hold 2 hours, then furnace cool or cool in still :Best done warm 400-800 F (200-425 C)HardeningPreheat: Heat to 1550-1600 F (845-870 C).

7 1900-2000 F (1035-1095 C), hold time at temper-ature 15-30 :Air or positive pressure quench (2 bar minimum) tobelow 125 F (50 C), or salt or interrupted oil quench to about1000 F (540 C), then air cool to below 125 F (50 C). Temper: Double temper at 400-750 F (200-400 C). Hold for 2 hours minimum each time. (See Table) A freezing treatmentmay be used between the first and second tempers. Freezingtreatments help to attain maximum hardenability and mustalways be followed by at least one temper. NOTE: For optimum stress relieving, CPM S35VN may be temperedat 1000-1025 F (540-550 C).

8 Tempering in this range mayresult in a slight decrease in corrosion Change:+ to + when fully martensitic. Thepresence of retained austenite may reduce the net tempering at 400-750 F (200-400 C), freezing treatmentsmay be necessary to minimize retained : Properties shown throughout this data SHEET are typical variations in chemistry, size and heat treat conditions may causedeviations from these values. Recommended Heat Treatment:Austenitize 1950 F (1065 C). Quench to below 125 F (50 C).Double temper at 600 F (315 C) 2 hrs.

9 Minimum each to hand warm between tempers. A freezing treatment maybe added between hardness: 58-61 HRC. Thermal TreatmentsTempering Temperature F ( C)Hardness (HRC)Oil Quench +(200 C) (315 C) (540 C)Freeze -112 FHeat Treat Response - Hardness (HRC)Austenitizing Temperature1900 F 1950 F 2000 F (1040 C) (1065 C) (1095 C) Oil Oil + Oil Oil + Oil Oil +Tempering Freeze Freeze FreezeTemperature -112 F -112 F -112 F As Quenched 400 F (200 C) 600 F (315 C) 1000 F (540 C) Results may vary with hardening method and section size.

10 Salt or oil quenching will give maximum response. Vacuum or atmosphere cooling may result in up to 1-2 HRC points Time at Aust. Temp. 30 min. 30 min. 15 min. Minimum Number of Tempers 2 2 2 and GrindabilityIn the annealed condition, CPM S35VN is much easier tomachine than CPM S90V and easier to machine thanCPM S30V. Similar grinding equipment and practicesused for high speed steels are recommended.