{
  "schema": "native-teaching-figure/v1",
  "anchor": "c16-hardness-location-references",
  "retained_panel": {
    "sha256": "3fbffc8b02ba1505e781f0ed38e0b7a830ccc24a3c477e88f51550f13e86bc74",
    "status": "original butt/cap SVG nested unchanged"
  },
  "extension": {
    "geometry": "fillet/T joint with upper/lower deposits; weld metal, HAZ, parent and fusion boundaries",
    "points": "illustrative relationships; no count/load/spacing assigned"
  },
  "location_references": {
    "near_surface_butt_illustration": {
      "value": 1.6,
      "unit": "mm",
      "printed_equivalent": {
        "value": 0.063,
        "unit": "in"
      },
      "reference": "depth below surface"
    },
    "HAZ_microhardness": {
      "maximum": 0.5,
      "unit": "mm",
      "reference": "distance from fusion line within HAZ",
      "scope": "selected SCC-service PQR requirement"
    }
  },
  "historical_method": {
    "illustration_reference": "NACE RP0472-2005, Section5 Figures2/3",
    "selected_acceptance_routes": {
      "carbon_steel": "NACE RP0472",
      "other_materials": "NACE MR0103"
    },
    "current_compliance": "not inferred; applicable edition/material/service required"
  },
  "PWHT_qualification_companion": {
    "aggregate_holding_time": "sufficient for one additional PWHT, two total",
    "not_permission": "unlimited reheating or valve internals tolerance"
  },
  "not_established": [
    "hardness acceptance value",
    "test scale/load",
    "indentation spacing/count",
    "production examination extent",
    "HV-to-HB/HBW substitution"
  ]
}