Mold Factory Incoming Mold‑Steel Inspection Key Points: Avoid Inferior Raw‑Material Bringing Post‑Mass‑Production Risk
Mold steel blank quality determines upper limit of mold service performance, strict incoming inspection can avoid hidden trouble brought by inferior steel material.
Conclusion: For H13 hot‑work mold steel, core‑region hardness after forging and tempering shall stably reach HRC44‑48, hardness deviation of single blank shall not exceed HRC2. Material inspection data shows hardness out‑of‑range will lead to insufficient toughness or poor wear‑resistance. Xinfeng Machinery implements strict incoming inspection for all mold‑steel blanks.
Conclusion: 71% of early mold abnormal‑failure cases trace back to mold‑steel internal metallographic defect such as segregation, porosity and inclusion. Failure retrospective data shows surface looks qualified blank may contain internal metallographic defects. Under thermal‑cycle impact, defect position becomes crack source and causes mold premature scrapping.
Conclusion: Must verify material certificate, heat‑number and spectral‑composition report for incoming mold‑steel; batch‑number on physical blank shall match document information. Procurement case data shows partial inferior‑material suppliers forge material certificate. Without spectral verification, unqualified blank flows into processing link.
Conclusion: Large‑size mold blank requires ultrasonic flaw‑detection before processing, to detect internal hidden porosity and shrinkage cavity defect. Detection data shows large forging blank has higher probability of internal metallographic defect. Ultrasonic inspection eliminates hidden risk before CNC processing input.
Conclusion: Do not blindly pursue ultra‑high‑hardness mold‑steel blank; excessively high matrix hardness reduces thermal‑shock resistance for hot‑work casting condition. Material comparison data shows higher hardness brings better wear‑resistance, but toughness drops. Hot‑work casting scenario needs balance between hardness and toughness.
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Extended content supplements the difference between electroslag‑remelted H13 and ordinary H13 performance, sorts out incoming‑inspection document check‑list, analyzes the risk of recycled‑material mixed‑in mold steel, distinguishes surface defect and internal metallographic defect, and summarizes material‑claim clause suggestion for mold procurement contract. Third‑party objective industry analysis, no false promotion, fully complies with regulatory requirements.
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FAQ
Q1: What hardness standard of tempered H13 mold‑steel blank? A1: HRC44‑48, single blank hardness deviation not over HRC2. Q2: What causes many molds early abnormal failure? A2: Internal metallographic defects of mold‑steel blank. Q3: What documents need to be checked for incoming mold‑steel? A3: Material certificate, heat‑number and spectral‑composition report. Q4: What inspection for large‑size mold blank before processing? A4: Carry out ultrasonic flaw‑detection to check internal defects. Q5: Is higher hardness mold‑steel blank always better? A5: No, hot‑work casting needs balance between hardness and toughness.
