Steel hardness conversion API

Cross-walks steel hardness between Vickers (HV), Brinell (HB) and Rockwell C (HRC) and estimates tensile strength (σu≈3.45·HB) from any one input. Answers 'What HRC corresponds to 400 HV?', 'Roughly what tensile strength does this hardness imply?'.

Price$0.04per request

MethodPOST

Route/v1/engineering/hardness-conversion

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

materialhardnessbrinellvickersrockwelltensile-strengthconversionmachine-design

API URLhttps://x402.hexl.dev/v1/engineering/hardness-conversion

Integration docs

Example request

{
  "vickersHV": 400
}

Example response

{
  "vickersHV": 400,
  "brinellHB": 400,
  "rockwellHRC": 42.8,
  "estimatedTensileStrengthMpa": 1380,
  "estimatedTensileStrengthKsi": 200.15,
  "formula": "σu ≈ 3.45·HB (steel); HRC = 116.4 − 1471.6/√HV; HV≈HB below ~450",
  "interpretation": "Quick steel-hardness cross-walk and tensile estimate; treat HRC below ~20 as out of range.",
  "note": "Empirical approximation for steels — verify critical specs with a measured test."
}

Input schema

{
  "type": "object",
  "required": [],
  "properties": {
    "brinellHB": {
      "type": "number",
      "examples": [
        380
      ]
    },
    "vickersHV": {
      "type": "number",
      "examples": [
        400
      ]
    },
    "rockwellHRC": {
      "type": "number",
      "examples": [
        43
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}