High strength and wear resistance for demanding processes.
For heavy-duty applications where surfaces endure repeated loading and abrasion, our 4140 flame hardened rolls deliver exceptional strength and wear resistance. Flame hardening heats the roll surface to around 870–925 °C, then quenches it to form a martensitic layer with 50–60 HRC hardness while retaining a tough core.
When to choose this roll
- When processing metals, paper or plastics that abrade the roll surface.
- When high nip loads require both hardness and toughness.
- When operations involve high temperatures but corrosion is not the primary concern.
- When the roll must maintain dimensional stability under repeated stress.
- When you seek a cost-effective alternative to tool steel or chrome plating.
How it works
Our 4140 rolls are machined to final dimensions, then the surface is flame-hardened by heating with an oxy-fuel flame and immediate water or polymer quenching. This transforms the surface to a martensitic structure with high hardness while the interior remains ductile. Case depth typically ranges 1–5 mm. After hardening, we finish grind or polish the surface to the required tolerance and roughness.
Where it pays off / Applications
Metal forming rolls, paper processing, plastic extrusion, wood products, steel coil coating lines, and any process needing a tough, wear-resistant roll surface.
Specifications / Capabilities
Diameter: 940 mm by 8000 mm O.A.L. Weight: 5000 kg.
Surface hardness: 50–55 HRC.
Case depth: 1–5 mm typical.
Material: AISI 4140 alloy steel.
Finish: ground or polished; additional coatings available.
Compliance & options
Can be produced to PED 2014/68/EU when used as heating or cooling rolls. Optional chrome plating or thermal spray coatings for corrosion resistance. Journals can be machined to fit existing bearings.
