Advanced Heat Treatment for PM & MIM Components
Precision metallurgical thermal post-processing engineered to elevate powder metal tensile strength past 1300+ MPa and customize hardness across 25–60 HRC with near-zero distortion.
⚙ Engineered Structural Integrity
Ningbo Jiehuang Chiyang Electronic Tech Co., Ltd. (JHPIM) delivers end-to-end metallurgical engineering for demanding B2B OEM/ODM industrial applications worldwide.
🔥 Specialized Heat Treatment Capabilities
Tailored thermodynamic processing optimized for porous sintered structures, high-density MIM stainless steels, and low-alloy PM components.
Carburizing & Carbonitriding
Enriches surface carbon levels under active atmosphere control to form an ultra-hard, wear-resistant martensitic case while retaining a tough, shock-absorbing ductile core. Critical for sintered drive gears and lock latches subject to sliding friction.
- Effective Case Depth: 0.2 mm to 1.2 mm
- Surface Hardness: 55–62 HRC
Quench & Tempering (Q&T)
Continuous mesh-belt through-hardening followed by precision multi-stage tempering cycles. Calibrates optimal yield strength and dynamic fatigue limits across Fe-Cu-C, Fe-Ni-Mo, and pre-alloyed powder steel matrices.
- Core Hardness: 30–48 HRC
- Microstructure: Tempered Martensite
Precipitation Hardening (H900/H1150)
Specialized age-hardening designed for MIM stainless alloys (e.g., 17-4PH / AISI 630). Generates sub-microscopic intermetallic precipitates throughout the matrix, balancing supreme tensile strength with passivated corrosion resistance.
- Tensile Limit: Up to 1350 MPa
- Condition: H900, H1025, H1150
Vacuum Thermal Treatment
Oxygen-depleted, computer-regulated vacuum furnace processing with pressurized inert gas quenching (N₂/Ar). Guarantees zero surface decarburization, zero oxidation, clean metallic finish, and minimal geometric distortion.
- Vacuum Level: Up to 10⁻³ mbar
- Distortion Control: ≤ 0.03 mm
🔬 Overcoming PM & MIM Metallurgical Challenges
Powder metallurgy parts feature distinctive pore systems and microstructural kinetics that require exact atmosphere control and precision thermal curves.
🌡 Pore-Aware Atmosphere & Carbon Potential Management
Unlike fully dense wrought stock, PM sintered steels possess micro-porosity (densities ranging from 6.8 to 7.4 g/cm³). Unregulated atmospheres cause accelerated gas penetration, leading to excessive through-carburization and embrittlement. JHPIM applies closed-loop infrared gas analysis and oxygen probe feedback to modulate carbon potential (Cp), ensuring uniform case transitions without micro-cracking.
⛨ High-Density Sintering & MIM Shrinkage Homogeneity
Metal Injection Molding (MIM) involves 12–18% volumetric shrinkage during thermal debinding and sintering. Our integrated high-temperature vacuum sintering lines provide absolute thermal uniformity, pre-conditioning the parts to achieve uniform grain size and eliminating residual stress before final quench or precipitation hardening.
🛡 Prevention of Decarburization & Surface Oxidation
High surface-area ratios make powder metal parts prone to decarburization. By running endothermic atmospheres with strict dew point monitoring (≤ -40°C) and protective nitrogen-hydrogen blends, our post-processing preserves pristine surface chemistry, maintaining tight dimensional tolerances on critical gear tooth flanks and spline profiles.
📐 Distortion Mitigation via Fixture Engineering & Quench Optimization
Heat-induced warpage is mitigated through custom ceramic sintering trays, uniform gas-quenching vectors, and specialized hot-oil quenching baths. Post-hardening sizing (re-pressing) and precision CNC grinding are integrated where sub-micron dimensional tolerances are required.
🏅 Core Mechanical Benefits for Industrial B2B Buyers
Transforming sintered compacts into high-performance industrial components capable of outperforming wrought bar stock.
Superior Wear & High Fatigue Limits
Carburized surface cases exceeding 700 HV (58–62 HRC) withstand severe sliding abrasion, pitting, and cyclic fatigue stress in heavy-duty power transmission units, eliminating premature gear failure.
High Core Toughness & Impact Resistance
Precision tempering balances martensite with fine bainite, providing superior fracture toughness. This prevents catastrophic brittle failure during high-shock impacts in heavy industrial power tools and automotive drivelines.
Near-Net Shape Dimensional Precision
By coordinating sintering shrink factors with distortion-free vacuum quenching, our components achieve IT7–IT9 dimensional accuracy straight out of thermal treatment, minimizing or eliminating secondary CNC milling operations.
🚗 Serving Mission-Critical Industrial Sectors
Our heat-treated PM and MIM components are specified by global OEMs, Tier 1/2 automotive suppliers, and industrial system integrators.
Automotive Powertrain
Transmission planetary gearsets, engine timing sprockets, oil pump gerotors, seat recliners, and variable valve timing (VVT) components requiring high Hertzian contact fatigue life.
Power & Garden Tools
Impact blocks, high-torque bevel gears, reduction gearboxes, and oscillating counterweights subjected to severe cyclic torque, vibration, and abrasive wear.
High-Security Smart Locks
MIM and PM stainless deadbolts, lock latches, clutch cams, and anti-drill structural components requiring high shear strength and corrosion resistance.
Industrial Machinery & Fluid Valves
Hydraulic motor valve plates, planetary gear reducers, self-lubricating oil-impregnated spherical bearings, and structural brackets engineered for high continuous loads.
🏭 JHPIM Manufacturing & Engineering Scope
Integrated manufacturing workflows covering tooling design, powder blending, compaction, continuous sintering, heat treatment, and secondary operations.
Sintered Gears & Transmissions
Custom spur gears, helical gears, planetary gear systems, bevel gears, and compound transmission assemblies customized to precise tooth profiles and AGMA/DIN standards.
Complex MIM Micro Components
Intricate three-dimensional geometries, high-density stainless steel components (316L, 17-4PH), and custom alloy brackets that eliminate costly multi-axis milling.
Self-Lubricating Bearings
Iron-base and bronze-base sintered bushings, flanged sleeves, and spherical bearings vacuum-impregnated with synthetic lubricants for maintenance-free, low-noise operation.
DFM Optimization Consulting
Front-end Design for Manufacturability engineering. Our engineering team reviews step files, suggests tooling optimization, reduces molding risks, and shortens project lead times.
Cost Efficiency & Production Scale
Automated hydraulic pressing lines, continuous mesh belt sintering furnaces, and secondary CNC turning deliver consistent batches with 20%–50% cost reductions versus CNC billet machining.
Global OEM / ODM Supply Chain
Full B2B export infrastructure serving Tier 1/2 automotive suppliers, industrial machine builders, and specialized distributors with strict PPAP and ISO compliance documentation.
Ready to Optimize Your Powder Metallurgy Components?
Submit your 3D CAD files (STP, STEP, IGS, DWG) to Ningbo Jiehuang Chiyang Electronic Tech Co., Ltd. (JHPIM). Our metallurgical engineering team provides comprehensive DFM analysis, custom heat treatment profiles, and fast, competitive quotations within 24 hours.
📄 Request DFM Evaluation & Quote