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FORGE-Crushing Roll
ETERNAL
The H13 Forged Scrap Steel Crushing Roll is the core wear-resistant component in the scrap steel recycling and crushing line. Manufactured from AISI H13 hot work tool steel through strict forging and heat treatment, it features high hardness, excellent toughness and thermal fatigue resistance,distinguishing it from ordinary 42CrMo/35CrMo steel rolls and cast crushing rolls.
| C | 0.32-0.45% | Ensure hardness and strength |
| Si | 0.8-1.2% | Strengthen the matrix, heat fatigue resistance |
| Mn | 0.2-0.5% | Deoxidation and improvement of hardenability |
| Cr | 4.75-5.5% | Hardenability, high temperature oxidation resistance, wear resistance |
| Mo | 1.1-1.75% | High temperature strength, resistance to tempering softening |
| V | 0.8-1.2% | Refine grain size, wear resistance, and heat cracking resistance |
| P/S | ≤0.03% | Impurities, strict control of brittleness |
H13 can maintain high hardness and wear resistance at around 600°C, making it suitable for crushing rolls and hammer heads under high-speed impact.
During scrap steel crushing, the surface temperature of components rises and falls sharply. H13 can effectively prevent cracking (thermal cracking) caused by thermal stress.
Density: Forging improves material density and eliminates potential internal micro‑cracks.
Preferred electroslag remelting (ESR) H13 ingot to reduce inclusions and segregation;
Secondary refining + vacuum degassing to ensure uniform chemical composition.
Preheating: holding at 800–900°C to prevent internal cracks caused by poor thermal conductivity;
Initial forging: 1065–1120°C; final forging temperature ≥850°C, overburning strictly prohibited;
Multi‑pass upsetting and drawing with total forging ratio ≥4 (≥5 for large roll diameters) to break up carbides and form continuous metal flow lines;
Mandatory slow cooling after forging (pit cooling / furnace cooling), followed by prompt normalizing + high‑temperature tempering to eliminate residual stress.
Two‑stage preheating → austenitizing at 1020–1050°C → marquenching → double tempering at approx. 560°C (≥2 h each) to stabilize microstructure and hardness;
Cryogenic treatment optional to further reduce retained austenite.
Some high-end crushing rolls, after forging and heat treatment, are applied with a surface hardfacing layer or laser cladding. This greatly improves surface wear resistance by several times while maintaining the toughness of the base material.
High‑precision grinding, controlling coaxiality, cylindricity and runout to meet assembly and meshing clearance requirements.
Heavy duty scrap steel crusher and double shaft shredder are used to process hard metals such as automotive dismantling materials, steel sections, steel plate scraps, and industrial scrap iron, especially suitable for continuous and high load crushing operations.
