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Chisel Heat Treatment Process - YULINDINGLI
2023-07-11
Chisel Heat Treatment Process -- The Most Critical Step in Breaker Chisel Manufacturing
Every hydraulic breaker chisel we produce passes through our in-house heat treatment line — and this is where a good chisel becomes a great one. Proper heat treatment transforms raw forged steel into a tool that can withstand thousands of high-impact cycles on granite, concrete, and reinforced demolition material without chipping, blunting, or breaking.
Step-by-Step Process
1. Pre-Heating & Loading
Each chisel is first inspected for surface integrity after forging, then vertically loaded into our pit-type quenching furnaces using overhead cranes. Vertical positioning ensures uniform heat distribution along the entire working length of the tool, eliminating weak spots that can cause premature failure.
2. High-Temperature Austenitizing
The furnace is brought to a precisely controlled temperature (typically 860–920°C, depending on steel grade) and held for a calculated soak time. This step refines the grain structure of the steel and prepares it for quenching. We use thermocouple monitoring on every batch to guarantee temperature consistency — no guesswork, no shortcuts.
3. Quenching
Once the target temperature and soak time are reached, each chisel is rapidly quenched in polymer solution or oil. The controlled cooling rate locks in a hard martensitic structure at the surface while maintaining a tough, shock-resistant core. This is the step that gives our chisels their signature hardness — HRC 58–62 on the working end.
4. Tempering
After quenching, the chisels go through a tempering cycle at a lower temperature (typically 200–280°C). Tempering relieves internal stress built up during rapid cooling and fine-tunes the balance between hardness and toughness. The result: a chisel hard enough to stay sharp on abrasive rock, yet ductile enough not to snap under sudden impact.
5. Post-Treatment Inspection
Every batch undergoes hardness testing using a Rockwell hardness tester, and selected pieces go through deeper metallurgical analysis. Only chisels that meet our hardness and case-depth specifications move on to the final machining and finishing stages.
Equipment & Capacity
Our workshop is equipped with multiple pit-type quenching furnaces and dedicated tempering furnaces, supported by 5-ton overhead cranes for safe and efficient material handling. We process chisels ranging from 45mm to 210mm shank diameter — covering every popular breaker model from Montabert, Atlas Copco, Rammer, Indeco, JCB, Daemo, Komatsu, and more.
Many trading companies and small factories outsource heat treatment — which means inconsistent quality, longer lead times, and zero traceability when something goes wrong. By keeping the entire process under our own roof, we control every parameter, test every batch, and stand behind every chisel we ship. For our customers, that translates directly to:
✅ Longer service life on every job site
✅ Fewer breakage claims and downtime
✅ Consistent quality across repeat orders
✅ Full traceability from forging to finish
Built tough, heat-treated right — breaker chisels engineered for real work.
