"structural steel" meaning in English

{
  "forms": [
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      "form": "structural steels",
      "tags": [
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      "expansion": "structural steel (countable and uncountable, plural structural steels)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "Any form of steel used for making construction materials."
      ],
      "id": "en-structural_steel-en-noun-lkjJp5z2",
      "links": [
        [
          "construction",
          "construction"
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        [
          "material",
          "material"
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      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "structural steel"
}

{
  "forms": [
    {
      "form": "structural steels",
      "tags": [
        "plural"
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  ],
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      "expansion": "structural steel (countable and uncountable, plural structural steels)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "Any form of steel used for making construction materials."
      ],
      "links": [
        [
          "construction",
          "construction"
        ],
        [
          "material",
          "material"
        ]
      ],
      "tags": [
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  ],
  "word": "structural steel"
}