Heat Treatment
Pre-cleaning before heat treatment is an irreplaceable strategic process for ensuring quality, with its core value lying in the complete removal of cutting fluids, rust preventatives, and particulate contaminants from workpiece surfaces to eliminate three critical risks
Parts cleaning before heat treatment is an irreplaceable strategic process for ensuring quality, with its core value lying in the complete removal of cutting fluids, rust preventatives, and particulate contaminants from workpiece surfaces to eliminate three critical risks: first, preventing non-uniform carburization/nitriding caused by high-temperature organic decomposition (e.g., quenching oil carbonization above 300°C resulting in case depth fluctuations up to 0.2mm and hardness deviations of ±3 HRC); second, avoiding vacuum quenching pores from aqueous residues and chloride-induced hydrogen embrittlement fractures; third, eliminating quenching deformation (e.g., bearing rings exceeding ovality tolerance by 0.05mm) due to oil films (>5μm) reducing thermal conductivity efficiency by 15%. Additionally, pre-cleaning directly extends equipment lifespan—contaminated quenching oil accelerates aging, shortening replacement cycles by 40%, while carbonized grease buildup in sintering furnaces increases slag-cleaning frequency by twice monthly, causing 15% production loss. Hydrocarbon cleaning excels here: high-boiling solvents (190-210°C) coupled with ultrasonic cavitation remove >99.5% of heavy oil adhesion; low surface tension (28 dyn/cm) penetrates micropores achieving residual debris ≤10mg/m²; vacuum low-temperature drying (<120°C) ensures zero moisture retention; and closed-loop solvent recovery reduces consumption to <1L per ton of workpieces, cutting hazardous waste by 90% versus aqueous methods. Empirical data confirms that a gear manufacturer adopting this process increased carburization uniformity from 82% to 95%, reduced quenching deformation defects from 0.8% to 0.1%, and saved ¥370,000 annually in oil replacement costs, demonstrating its dual necessity in guaranteeing product performance and economic efficiency from the source.
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