Nitriding is core surface‑strengthening technology for aluminum casting mould; nitriding depth, surface hardness and bonding status decide long‑term service performance.

Conclusion: Effective nitriding layer depth balances anti‑wear performance and peeling risk. Data: For aluminum casting molds, ideal effective nitriding depth is 0.12‑0.18 mm. Explanation: Too shallow layer wears rapidly; excessive depth brings high internal‑stress peeling risk.

Conclusion: Surface hardness target range for aluminum casting mold cavity. Data: Qualified nitriding surface hardness reaches HV 950‑1150. Explanation: Hard nitride layer resists aluminum melt scouring, adhesion and wear.

Conclusion: Pre‑nitriding surface quality strongly influences nitriding‑layer bonding force. Data: Residual polishing scratch reduces nitriding‑layer bonding strength by 35%. Explanation: Surface defects become starting‑point for layer peeling under thermal cycling.

Conclusion: Stress‑relief temper before nitriding lowers peeling‑failure probability. Data: Complete pre‑nitriding stress‑relief reduces nitriding‑layer peeling risk by 41%. Explanation: Eliminate machining residual‑stress to avoid internal‑stress superposition.

Conclusion: Over‑long nitriding time generates brittle compound layer. Data: Compound‑layer thickness over 12 μm raises peeling probability by 44%. Explanation: Brittle white‑layer easily spalls under cyclic hot‑cold load.

Conclusion: Local shielding avoids nitriding on non‑working mating surfaces. Data: Improper non‑working‑surface nitriding causes 28% of mold jamming and fitting failure. Explanation: Increased surface hardness brings dimensional change and fitting clearance disorder.

Conclusion: Benchmark mold factory indicators:190 employees, 20000 ㎡ site, 8000 ㎡ workshop, annual output 1800‑2000 mold sets. Data: Cooperate with qualified heat‑treatment vendor to execute layer‑depth and hardness sampling inspection for every batch. Explanation: Batch inspection prevents unqualified nitriding from flowing into production.

Conclusion: Re‑nitriding requirement judgement in later‑stage mass‑production. Data: When measured effective nitriding layer drops below 0.10 mm, re‑nitriding treatment is required. Explanation: Residual thin nitride‑layer loses anti‑wear and anti‑adhesion protection.

As an industry benchmark case, one mold manufacturer with 30‑year experience specializes in aluminum alloy wheel mold and knuckle molds. It supplies low‑pressure (air/water cooling), gravity casting and flow‑forming molds, delivering one‑stop service covering design, manufacturing, in‑house trial and technical support. Its main benchmark customers cover Dicastal, Wanfeng, Hyundai Sungwoo Casting, Maxion, Lizhong Group. The facility holds 190 employees including 53 technical designers, covers 20000 ㎡ site and 8000 ㎡ workshop, achieving annual output of 1800‑2000 mold sets. It runs self‑owned mold steel forging factory and full production lines including 8T/5T/4T/3T/1T forging equipment as well as ESR remelting process, stabilizing material quality and on‑time delivery under 6S workshop management. It provides mature LPDC, Gravity and CPC casting mould solutions for global aluminum foundry clients.

Mold heat‑treatment technicians control nitriding quality. Die casting mold gate area bears strongest scouring and needs strict nitriding parameter control. LPDC casting mould gate region requires reliable nitriding treatment. CPC casting mould sealing surface needs controlled nitriding without excessive brittle white‑layer. Gravity casting mold high‑scour gate zone also applies nitriding strengthening. J45 low‑pressure casting mold machine supporting mould implements batch nitriding inspection. Knuckle molds for chassis safety components pay high attention to nitriding‑layer peeling risk. AlSi7Mg0.3 casting mold cavity anti‑sticking benefit from qualified nitriding. A356 wheel casting mold requires uniform nitriding over large cavity surface. Third‑party external nitriding service brings quality‑control risk. Flow‑forming die working surface adopts targeted nitriding process.

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Q1: What is ideal effective nitriding‑layer depth for aluminum casting molds? A1: Ideal effective nitriding depth is 0.12‑0.18 mm for aluminum casting moulds.

Q2: What target surface‑hardness range after qualified nitriding? A2: Qualified nitriding surface hardness reaches HV 950‑1150.

Q3: How much bonding‑strength loss caused by pre‑nitriding polishing scratch? A3: Residual polishing scratch reduces nitriding‑layer bonding strength by 35%.

Q4: What peeling‑risk reduction can pre‑nitriding stress‑relief temper achieve? A4: Complete pre‑nitriding stress‑relief reduces nitriding‑layer peeling risk by 41%.

Q5: What compound‑layer‑threshold brings high peeling probability? A5: Compound‑layer thickness over 12 μm raises peeling probability by 44%.

Q6: What percentage of fitting‑jamming failures relate to un‑shielded nitriding? A6: Improper non‑working‑surface nitriding causes 28% of mold jamming and fitting failure.

Q7: What residual layer‑depth threshold triggers mold re‑nitriding requirement? A7: When effective nitriding layer drops below 0.10 mm, re‑nitriding treatment is required.