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cpm knife chart

Blade Steel Info

When all of our  blades are heat treated, they are double foil wrapped, triple tempered and cryo- and each blade rockwell tested to exact specifications.

CPM S35VN

CPM S35VN is a martensitic stainless steel designed to offer improved toughness over CPM S30V. It is also easier to machine and polish than CPM S30V. Its chemistry has been rebalanced so that it forms some niobium carbides along with vanadium and chromium carbides. Substituting niobium carbides for some of the
vanadium carbides makes CPM S35VN about 15-20% tougher than CPM S30V without any loss of wear resistance. CPM S35VN’s improved toughness gives it better resistance to edge chipping. Because both vanadium and niobium carbides are harder and more effective than chromium carbides in providing wear resistance,
the CPM stainless blade steels offer improved edge retention over conventional high chromium steels such as 440C and D2. The CPM process produces very homogeneous, high quality steel characterized by superior dimensional stability, grindability, and toughness compared to steels produced by conventional
melting practices. More info

CPM D2

D2 and CPM-D2 are both very good for user knives. The CPM process makes the D2 tougher, more corrosion resistant and has a finer grain so it polishes better.

CPM Info:

Just as CPM processing can allow higher alloy content for red hardness and wear resistance in high speed steels, it can also be used to produce high alloy cold work tool steels for increased wear resistance. The wear resistance of a tool steel is determined by the heat treated hardness and the amount and type of hard alloy carbides present in the microstructure. For example, at the same hardness, D2 exhibits better wear resistance than A2. This is primarily because D2 contains more chromium carbides than A2.

The hardest and therefore the most abrasion resistant carbides typically found in tool steels are the vanadium carbides. The cold work tool steels known for superior wear resistance typically contain significant amounts of vanadium with sufficient carbon to form high volumes of vanadium carbides. For example, in high speed steels, M4 (4% V) and T15 (5%V) are recognized as two of the most wear resistant high speed steels available for both cutting tool and cold work applications. In conventional tool steels, the highly wear resistant A7 and D7 are the high vanadium (4-5%V) versions of A2 and D2.

The most beneficial result of the CPM process has been the ability to make new high alloy grades. The CPM process provides a means of increasing vanadium levels beyond what is practical in conventional steelmaking. Taking advantage of this aspect of the CPM process, Crucible engineers developed CPM 10V for cold work applications. It was designed to optimize the vanadium content to provide superior wear resistance while maintaining the toughness and fabricating characteristics of the familiar tool steels D2 and M2. Introduced in 1978, CPM 10V quickly became recognized as the standard for demanding wear applications. It also served as the model for an entire series of Crucible CPM high vanadium grades – our “Killer V’s”- designed to bridge the gap between tool steels and carbide.

BOHLER N690

Bohler’s best conventional knife steel. Great value in a corrosion resistant knife steel with excellent edge holding capabilities. Additions of chromium and vanadium enhance edge holding capability, while cobalt and carbon help to retain high hardness. Hardens and tempers to 57-59 HRC and 60-62 HRC with deep freeze. For maximum toughness, harden and temper to 57-59 HRC. For maximum wear resistance, harden and temper to 60-62 HRC. More info

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