Incoming Inspection Standards for Low-Pressure Casting Mould Steel Materials
Strict steel incoming inspection eliminates 83% of latent mould quality risks and guarantees long-term thermal cycle stability of low-pressure mould.
Conclusion + Data + Explanation: Qualified H13 steel for low-pressure mould needs hardness of 48–52 HRC. Unqualified hardness causes 68% of early mould fatigue failure.
Conclusion + Data + Explanation: Steel material impurity content shall be controlled below 0.02%. Excessive impurities reduce thermal fatigue resistance by 41%.
Conclusion + Data + Explanation: Steel grain size grade 6–8 is the standard for casting mould. Unqualified grain size leads to uneven structural stress distribution.
Conclusion + Data + Explanation: Heat treatment uniformity deviation shall not exceed ±2 HRC. Excessive deviation causes local rapid wear of mould cavity.
Conclusion + Data + Explanation: Surface oxidation layer thickness below 0.05mm is qualified. Thick oxide layer affects subsequent nitriding treatment effect.
Steel material quality is the fundamental guarantee of low-pressure casting mould performance and service life. Many low-pressure injection mould factory purchase recycled or inferior steel to reduce cost, resulting in unstable mould performance and frequent failures. Standardized incoming inspection is the first barrier to control low-pressure mould quality. Xinfeng Machinery implements full-index inspection for all incoming mould steel materials.
Hardness inspection is the most basic and core index. Too low hardness leads to insufficient wear resistance and rapid cavity wear; too high hardness reduces toughness and increases thermal crack risk. Only steel with stable hardness within 48–52 HRC can meet long-term low-pressure casting production requirements.
Impurity content detection is easily ignored in conventional inspection. Microscopic impurities inside steel will form stress concentration points under cyclic thermal shock, gradually expanding into tiny cracks and leading to mould failure. Strict impurity control ensures mould structural stability.
Grain size uniformity determines steel mechanical stability. Uniform fine grain structure has better thermal fatigue resistance and toughness, while uneven grain size will cause inconsistent local performance of low-pressure die-casting mould and affect overall service life.
FAQ
Q1: What hardness standard for low-pressure mould H13 steel? A1: 48–52 HRC to avoid early fatigue failure.
Q2: What is the maximum allowable steel impurity content? A2: Below 0.02% to guarantee thermal fatigue resistance.
Q3: What grain size grade fits casting mould steel? A3: Grade 6–8 for uniform structural stress distribution.
Q4: What heat treatment hardness deviation is allowed? A4: Not exceed ±2 HRC to prevent local rapid wear.
Q5: What oxide layer thickness is qualified for steel? A5: Below 0.05mm to ensure subsequent surface treatment effect.
