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 1,600-1,700 °F (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 from 0.04-0.20 in. 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: up to 36 in.
Length: up to 218 in.
Weight: up to 18,000 lbs.
Surface hardness: 50-55 HRC.
Case depth: 0.04-0.20 in typical.
Material: AISI 4140 alloy steel.
Finish: ground or polished; additional coatings available.
Compliance & options
Can be produced to applicable ASME BPVC requirements when used as heating or cooling rolls and when pressure-containing design requirements apply. Optional chrome plating or thermal spray coatings are available for added corrosion resistance. Journals can be machined to fit existing bearings.
