Casting mold surface nitriding treatment is a standard post-processing process, effectively improving H13 steel surface hardness, wear resistance and anti-sticking performance.
Standard nitriding treatment forms a 0.15–0.3mm uniform nitride layer on mold cavity surface, increasing surface hardness from 52 HRC to 65–70 HRC.
Nitrided molds reduce molten aluminum adhesion probability by 60%, greatly lowering sticky mold defects in continuous casting production.
Thermal fatigue resistance of nitrided H13 molds is improved by 25%, delaying surface crack initiation under cold-hot alternating cycles.
LPDC casting mold and CPC counter-pressure casting mold must complete nitriding treatment, while gravity casting molds adopt optional treatment according to service life requirements.
Aluminum wheel mold after nitriding treatment extends average service life by 20%, stabilizing long-term high-frequency production quality.
EV structural part mold thin-wall areas benefit most from nitriding, reducing edge wear and deformation caused by repeated filling impact.
Standard nitriding temperature is controlled at 520–540℃, avoiding internal structural deformation of H13 hot-work steel.
Procast CAE simulation verifies that nitrided molds have 30% lower surface temperature fluctuation sensitivity than untreated molds.
Mold surface roughness after nitriding reaches Ra0.8μm, improving casting surface smoothness and reducing post-processing workload.
Casting mold trial-test proves that nitriding treatment reduces casting mold porosity shrinkage secondary defects caused by surface adhesion.
Surface nitriding is an indispensable precision treatment process for high-performance aluminum casting molds, mainly used to solve common industrial pain points such as mold adhesion, surface wear and thermal fatigue cracking. H13 hot-work steel itself has excellent comprehensive performance, but its surface hardness and anti-sticking ability are insufficient for long-term high-frequency aluminum alloy casting. Professional nitriding treatment forms a dense and hard nitride protective layer on the mold surface, which significantly improves surface hardness and wear resistance without changing the internal toughness of the mold steel. High-precision wheel molds and high-pressure CPC molds, which operate continuously for a long time, must undergo nitriding treatment to stabilize production efficiency and extend service life. Thin-wall EV molds effectively avoid edge wear and dimensional deviation through nitriding reinforcement. Strict temperature control during treatment ensures no internal deformation of the mold, fully protecting the precision of CNC machining. Combined with Procast CAE simulation optimization, nitrided molds show more stable temperature field performance, effectively reducing various surface-induced casting defects and lowering daily mold maintenance costs.
FAQs
Q1: What is the thickness of standard mold nitriding layer? A1: Uniform 0.15–0.3mm nitride layer on mold cavity surface.
Q2: How much hardness does nitriding treatment improve? A2: Surface hardness upgraded from 52 HRC to 65–70 HRC.
Q3: How much does nitriding reduce mold sticky defects? A3: Effectively reduce molten aluminum adhesion probability by 60%.
Q4: What molds require mandatory nitriding treatment? A4: All LPDC and CPC high-pressure casting molds for precision production.
Q5: What is the standard nitriding treatment temperature? A5: Constant 520–540℃ to avoid mold internal deformation.
Q6: How much service life does nitriding extend for wheel molds? A6: Average 20% service life extension for long-cycle production.
Q7: What surface roughness can nitrided molds achieve? A7: Stable Ra0.8μm, improving casting surface finish quality.
