"crucible steel" meaning in English

{
  "forms": [
    {
      "form": "crucible steels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
        "2": "s"
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      "expansion": "crucible steel (usually uncountable, plural crucible steels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Alloys",
          "orig": "en:Alloys",
          "parents": [
            "Metals",
            "Matter",
            "Metallurgy",
            "Chemistry",
            "Nature",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A high-grade steel, used in tools and dies, originally made by fusing wrought iron and charcoal in a crucible."
      ],
      "id": "en-crucible_steel-en-noun-pf5-URFa",
      "links": [
        [
          "tool",
          "tool"
        ],
        [
          "die",
          "die"
        ],
        [
          "wrought iron",
          "wrought iron"
        ],
        [
          "charcoal",
          "charcoal"
        ]
      ],
      "tags": [
        "uncountable",
        "usually"
      ],
      "translations": [
        {
          "code": "is",
          "lang": "Icelandic",
          "sense": "high-grade steel used in tools and dies",
          "tags": [
            "neuter"
          ],
          "word": "deiglustál"
        }
      ],
      "wikipedia": [
        "crucible steel"
      ]
    }
  ],
  "word": "crucible steel"
}

{
  "forms": [
    {
      "form": "crucible steels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-",
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      "expansion": "crucible steel (usually uncountable, plural crucible steels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "Pages with 1 entry",
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        "Terms with Icelandic translations",
        "en:Alloys"
      ],
      "glosses": [
        "A high-grade steel, used in tools and dies, originally made by fusing wrought iron and charcoal in a crucible."
      ],
      "links": [
        [
          "tool",
          "tool"
        ],
        [
          "die",
          "die"
        ],
        [
          "wrought iron",
          "wrought iron"
        ],
        [
          "charcoal",
          "charcoal"
        ]
      ],
      "tags": [
        "uncountable",
        "usually"
      ],
      "wikipedia": [
        "crucible steel"
      ]
    }
  ],
  "translations": [
    {
      "code": "is",
      "lang": "Icelandic",
      "sense": "high-grade steel used in tools and dies",
      "tags": [
        "neuter"
      ],
      "word": "deiglustál"
    }
  ],
  "word": "crucible steel"
}