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Factory Direct

9CrSi

Paper, wood, economy tooling — Economical and forgiving. Common for large straight knives.

What it is

9CrSi is one of the seven grades we keep in stock and machine every week. Hardness HRC 56–60, wear resistance Medium-high, toughness Medium. Best suited to paper, wood, economy tooling.

HardnessHRC 56–60
Wear resistanceMedium-high
ToughnessMedium
Best forPaper, wood, economy tooling
Our noteEconomical and forgiving. Common for large straight knives.

Where it wins and where it loses

Choose it when

  • Your blades fail by wearing out, not by chipping
  • You need HRC 56–60 and want it written on the quote
  • The application fits paper, wood, economy tooling

Look elsewhere when

  • The blade is chipping or cracking — go tougher, not harder
  • You need corrosion resistance — use 440C stainless
  • Line speed is very high — HSS or carbide holds hardness better

How we work it

9CrSi is vacuum hardened and tempered in-house, then ground on CNC and surface grinders. Hardness is checked on every piece before it is packed. If your drawing calls for a different hardness window, we will tell you whether it is achievable and what it costs in toughness.

Materials used for this blade

Circular & Slitting Knives
Circular & Slitting Knives

Precision rotary knives for film, foil, paper and lithium battery electrode slitting

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Long & Shearing Knives
Long & Shearing Knives

Long straight knives for paper cutters, shearing machines and scrap cutting

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Corrugated Box Knives
Corrugated Box Knives

Thin slitter blades, cross-cut knives, slotting and trimming knives for corrugated lines

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Shredder & Crusher Blades
Shredder & Crusher Blades

Shredder, crusher and granulator blades for tyres, plastics, wood and scrap

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Frequently asked questions

Paper, wood, economy tooling. Hardness HRC 56–60, wear resistance Medium-high, toughness Medium.
Economical and forgiving. Common for large straight knives. Tell us the material you cut, your line speed and how the current blade fails, and we will say plainly whether this grade is right or wrong for you.
Yes — we machine all seven grades in-house. Send a drawing or a used sample and we will quote it with the heat treatment that fits.