01Alloy grade and chemical composition
WhatVerify material grade, principal alloying elements, heat number and any required composition retest.
WhyComposition variation directly changes hardness, toughness, wear resistance and heat-treatment response.
EvidenceMaterial certificates, spectrometric or chemical analysis, heat identity and physical marking records.
02Hardness range and distribution
WhatMeasure hardness at specified locations across surfaces, sections or zones and assess uniformity.
WhyLow hardness accelerates wear; excessive or uneven hardness can increase brittle-fracture risk.
EvidenceMeasurement map, raw hardness data, equipment identification and nonconformance disposition.
03Impact and wear performance
WhatConfirm duty conditions, performance criteria, specimen method and required impact or wear test.
WhyHardness alone does not prove resistance to actual impact, abrasive wear or continuous loading.
EvidencePerformance test reports, specimen locations, batch traceability and customer-approved acceptance basis.
04Casting integrity and machining allowance
WhatInspect shrinkage, slag, cracks and weld repair, and verify machining allowance in critical zones.
WhyDefects or insufficient allowance may appear after machining and cause undersize, rework or scrap.
EvidenceCasting inspection records, defect maps, allowance measurements and repair reinspection results.
05Post-treatment distortion and installation dimensions
WhatRecheck datums, flatness, concentricity, hole spacing and installation interfaces after heat treatment.
WhyA part may meet material properties yet fail to install or operate because of treatment distortion.
EvidenceBefore-and-after dimensions, straightening records, final inspection and trial-fit results.
06Spare-part interchangeability
WhatCompare the original part, drawing or site interface for critical mounting dimensions, orientation and fits.
WhyA non-interchangeable replacement extends downtime and increases site modification cost.
EvidenceReverse-engineering records, interface reports, trial fit or template verification and approved deviations.