電気アーク炉によるステンレス鋼製造

耐食性のためにクロムで鉄を合金化する

Metallurgy & Metal Processing Global Industrial Scale $150 billion

概要

Stainless steel is produced by melting scrap steel and ferroalloys in an electric arc furnace (EAF), followed by refining in an argon-oxygen decarburization (AOD) vessel. The addition of minimum 10.5% chromium forms a self-healing chromium oxide passive layer that provides corrosion resistance. The most common grade, 304 (18% Cr, 8% Ni), is used in kitchen equipment, medical instruments, and chemical plant. Over 200 stainless steel grades exist for applications from cutlery to nuclear reactors.

化学プロセス

Scrap stainless steel, carbon steel, ferrochromium, and ferronickel are melted in an EAF at 1,600-1,700 degrees C using graphite electrodes carrying 30,000-100,000 amps. The molten steel is transferred to an AOD vessel where oxygen and argon are blown through the melt to decarburize (reduce C from ~1.5% to <0.03%) without oxidizing chromium. Lime additions remove sulfur and phosphorus. The refined steel is cast into slabs or billets by continuous casting.

C(in steel) + ½O₂ → CO (decarburization in AOD)
Cr₂O₃(slag) + 3C → 2Cr(in steel) + 3CO (chromium recovery by argon dilution — Le Chatelier effect)
Fe₂O₃ + 3C → 2Fe + 3CO (scrap melting in EAF)

原材料

  • Stainless steel scrap — Recycling (end-of-life and manufacturing scrap) (Primary raw material (60-80% of charge))
  • Ferrochromium (FeCr) — Reduction of chromite ore in submerged arc furnace (Chromium source (50-70% Cr))
  • Ferronickel (FeNi) — Reduction of laterite ore (Nickel source (for austenitic grades))

最終製品

  • Stainless steel slabs/billets — Kitchen equipment, medical, chemical plant, construction, automotive (Grade 304 (18Cr-8Ni), 316 (16Cr-10Ni-2Mo), 430 (17Cr) most common)
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Environmental Impact

Stainless steel has the highest recycling rate of any material (>80% at end of life). EAF steelmaking from scrap produces 75% less CO₂ than blast furnace steelmaking. However, ferrochromium production is energy-intensive (3,500-4,000 kWh/ton FeCr). Hexavalent chromium (Cr(VI)) formed during welding and grinding is a carcinogen requiring exposure controls.

安全性の考慮事項

最新のイノベーション

Hydrogen-reduced ferrochromium (H-FeCr) eliminates CO₂ from chromium production.
Duplex stainless steels (50% austenite, 50% ferrite) reduce nickel content while maintaining properties. 3D metal printing with stainless steel powder enables complex shapes without machining waste.

生産規模

60000000

トン/年

$150 billion

市場価値

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Frequently Asked Questions

What industry uses 電気アーク炉によるステンレス鋼製造?
電気アーク炉によるステンレス鋼製造 is used in the metallurgy & metal processing sector at global industrial scale scale.
What process is involved in 電気アーク炉によるステンレス鋼製造?
Scrap stainless steel, carbon steel, ferrochromium, and ferronickel are melted in an EAF at 1,600-1,700 degrees C using graphite electrodes carrying 30,000-100,000 amps. The molten steel is transferred to an AOD vessel where oxygen and argon are blown through the melt to decarburize (reduce C from ~
What is the economic significance of 電気アーク炉によるステンレス鋼製造?
電気アーク炉によるステンレス鋼製造 has a market value of $150 billion and annual production of 60,000,000 tons.
What is the environmental impact of 電気アーク炉によるステンレス鋼製造?
Stainless steel has the highest recycling rate of any material (>80% at end of life). EAF steelmaking from scrap produces 75% less CO₂ than blast furnace steelmaking. However, ferrochromium production is energy-intensive (3,500-4,000 kWh/ton FeCr). Hexavalent chromium (Cr(VI)) formed during welding
What raw materials are used in 電気アーク炉によるステンレス鋼製造?
The main raw materials include: Stainless steel scrap, Ferrochromium (FeCr), Ferronickel (FeNi).