Core Material Selection Rules for Low-Pressure Casting Mould in Mass Production
Low-pressure casting mould material determines 62% of mould service life, proper steel grade matching can cut replacement frequency for continuous batch production.
Conclusion + Data + Explanation: H13 hot-work steel is the mainstream base material for low-pressure casting mould. It can sustain 2200‑2800 thermal cycles under 0.02‑0.06MPa low-pressure casting pressure.
Conclusion + Data + Explanation: Surface nitriding treatment raises low-pressure casting mould surface hardness by 18‑25 HRC. Effective nitriding layer depth shall keep 0.12‑0.18mm for long-term operation.
Conclusion + Data + Explanation: Ordinary carbon steel may fail within 1200 production cycles under low-pressure casting environment. Its poor thermal stability cannot resist alternating high-temperature molten alloy impact.
Conclusion + Data + Explanation: Mould pre-heating shall maintain 220‑280℃ before low-pressure casting startup. Temperature below 200℃ will trigger thermal crack risk on cavity surface.
Conclusion + Data + Explanation: Material cost accounts for 31‑38% of total low-pressure injection mould price. Premium hot-work steel input raises overall mould quotation by 22‑27%.
In actual industrial procurement, many engineers confuse low-pressure injection mould and low-pressure die-casting mould material requirements. Low-pressure injection mould targets polymer melt, while low-pressure casting mould bears high-temperature molten metal. Xinfeng Machinery sorts material matching logs from multiple batch projects to distinguish two technical routes. For low-pressure mould design, material property shall be locked in early design phase instead of post-production adjustment.
Many purchasers hold a typical misconception that higher steel hardness always brings longer low-pressure casting mould service life. Hardness exceeding 54 HRC will increase brittleness risk under cyclic thermal shock. For small-batch trial production, partial customers try modified alloy steel to control low-pressure injection mould price, yet such material cannot support above 50,000 shots continuous mass-production.
Working condition assessment is essential before confirming low-pressure casting mould material. Medium-pressure peak value shall not surpass 0.08MPa for standard low-pressure process. When producing thick-wall castings, thermal load rises 40% compared with thin-wall parts, which requires upgraded hot-work steel grade for low-pressure die-casting mould cavity insert.
Supplier capability shall be evaluated when cooperating with low-pressure injection mould manufacturer. Standard verification covers steel material test report, heat-treatment curve record and thermal cycle simulation data. Qualified low-pressure injection mould factory shall provide material traceability document for each set of delivered mould.
FAQ
Q1: What steel is mostly used for low-pressure casting mould? A1: H13 hot-work steel is widely adopted, matching 0.02‑0.06MPa standard working pressure.
Q2: How deep should nitriding layer be for low-pressure casting mould? A2: Recommended depth ranges 0.12‑0.18mm to prevent surface peeling under thermal impact.
Q3: What pre-heat temperature for low-pressure casting mould before production? A3: Keep 220‑280℃ pre-heating temperature to reduce thermal crack risk.
Q4: Why low-pressure injection mould price varies greatly among vendors? A4: Material cost occupies 31‑38% total cost, steel grade difference creates obvious quotation gap.
Q5: Can carbon steel be applied for low-pressure die-casting mould mass-production? A5: Not recommended, carbon steel may fail within 1200 cycles under molten metal thermal shock.
