{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "5631",
  "company_name": "日本製鋼所",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/5631/",
  "api_url": "/api/5631/decisions.json",
  "updated": "2026-08-05",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/5631/",
  "count": 4,
  "description": "Index of this company's management decisions. One decision = one endpoint: follow api_url for the full dossier (background, the decision itself, outcome, quoted primary sources and references).",
  "decisions": [
    {
      "slug": "iron-works-divestiture-1931",
      "url": "/tse/5631/decisions/iron-works-divestiture-1931/",
      "api_url": "/api/5631/decisions/iron-works-divestiture-1931.json",
      "year": 1931,
      "month": 12,
      "type": "divestiture",
      "tags": [
        "pf-exit",
        "pf-focus",
        "cp-spinoff"
      ],
      "title": "製鉄・採鉱事業の分離と輪西製鉄の設立、鋳鍛鋼・兵器・産業機械への集中",
      "subtitle": "銑鋼一貫を保つか、鋼を鍛える工程に絞るか——軍縮期の日本製鋼所が引いた事業の線",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "injection-molding-entry-1960",
      "url": "/tse/5631/decisions/injection-molding-entry-1960/",
      "api_url": "/api/5631/decisions/injection-molding-entry-1960.json",
      "year": 1960,
      "month": null,
      "type": "new_business",
      "tags": [
        "pf-diversify-related",
        "bm-core-shift",
        "st-tech"
      ],
      "title": "独アンケル・ベルク社からの技術導入によるプラスチック射出成形機事業の立ち上げと、一般産業機械部門の拡大",
      "subtitle": "兵器の跡地に何を置くか——鋳鍛鋼と鋼板で七割を稼いでいた会社が、樹脂を成形する機械の会社へ寄っていくまで",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "nuclear-forging-expansion-2007",
      "url": "/tse/5631/decisions/nuclear-forging-expansion-2007/",
      "api_url": "/api/5631/decisions/nuclear-forging-expansion-2007.json",
      "year": 2007,
      "month": 6,
      "type": "strategy",
      "tags": [
        "st-capex",
        "st-tech",
        "tr-crisis"
      ],
      "title": "室蘭製作所の製鋼・鍛錬設備の増強と、原子力発電向け大型鍛鋼への傾斜",
      "subtitle": "受注の波を避けるか、供給責任を引き受けるか——「大型設備投資はしない」と語った経営が二年後に室蘭へ投じた800億円超",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "material-business-spinoff-2020",
      "url": "/tse/5631/decisions/material-business-spinoff-2020/",
      "api_url": "/api/5631/decisions/material-business-spinoff-2020.json",
      "year": 2020,
      "month": 1,
      "type": "reorganization",
      "tags": [
        "cp-spinoff",
        "pf-focus",
        "tr-turnaround"
      ],
      "title": "素形材・エネルギー事業の日鋼MECへの吸収分割と、6年後の日本製鋼所M&Eの本体への吸収合併",
      "subtitle": "切り出して直すか、抱えたまま直すか——室蘭の構造赤字に対して日本製鋼所が組んだ二段構えの組織再編",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "divestiture",
      "count": 1,
      "url": "/api/5631/decisions/by-type/divestiture.json"
    },
    {
      "key": "new_business",
      "count": 1,
      "url": "/api/5631/decisions/by-type/new_business.json"
    },
    {
      "key": "reorganization",
      "count": 1,
      "url": "/api/5631/decisions/by-type/reorganization.json"
    },
    {
      "key": "strategy",
      "count": 1,
      "url": "/api/5631/decisions/by-type/strategy.json"
    }
  ],
  "by_decade": [
    {
      "key": "1930s",
      "count": 1,
      "url": "/api/5631/decisions/by-decade/1930s.json"
    },
    {
      "key": "1960s",
      "count": 1,
      "url": "/api/5631/decisions/by-decade/1960s.json"
    },
    {
      "key": "2000s",
      "count": 1,
      "url": "/api/5631/decisions/by-decade/2000s.json"
    },
    {
      "key": "2020s",
      "count": 1,
      "url": "/api/5631/decisions/by-decade/2020s.json"
    }
  ]
}