Steel Producers

In term of output:
116.4 Mton ArcelorMittal (Global)
35.7 Mton Nippon Steel (Japan)
34.0 Mton JFE (Japan)
31.1 Mton POSCO (South Korea)
28.6 Mton Shanghai Baosteel Group Corporation (China)
26.6 Mton Tata Steel (India head office) (Global)
23.6 Mton LiaoNing An-Ben Iron and Steel Group (China)
22.9 Mton Shagang Group (China)
22.8 Mton HeBei Tangshan Iron & Steel Group (China)
21.5 Mton United States Steel Corporation (United States)
20.2 Mton Wuhan Iron and Steel (China)
20.0 Mton Nucor Corporation (United States)
18.6 Mton Gerdau (Brazil)
17.9 Mton Gruppo Riva (Italy)
17.3 Mton Severstal (Russia)
17.0 Mton ThyssenKrupp (Germany)
16.2 Mton EvrazHolding (Russia)
14.2 Mton Magang Group (China)
13.9 Mton Steel Authority of India Limited (India)
13.8 Mton Sumitomo Metal Industries (Japan)
13.3 Mton Magnitogorsk Iron and Steel Works (Russia)
13.1 Mton Techint (Argentina/Italy)
12.9 Mton Shougang (China)
12.1 Mton ShanDong Jinan (China)
11.7 Mton ShanDong Laiwu Steel (China)
11.1 Mton Valin Steel Group (China)
10.9 Mton China Steel (Taiwan)
10.1 Mton Imidro (Iran)
10.0 Mton Hyundai INI Steel (South Korea)
9.7 Mton Novolipetsk (Russia)
9.3 Mton ShanXi Taiyuan Iron and Steel Company (China)
9.1 Mton Metalloinvest (Russia)
9.0 Mton HeNan Anyang Iron & Steel (China)
8.8 Mton Inner Mongolia Baotou Steel (China)
8.7 Mton Usiminas (Brazil)
8.3 Mton Hebei Handan Iron & Steel (China)
8.1 Mton Celsa Group (Spain)
8.1 Mton Kobe Steel (Japan)
7.6 Mton Hebei Tangshan Jianlong (China)
7.4 Mton Gansu Jiuquan Iron & Steel Group (China)
Total world steel output in 2007: 1,344,3 million metric tons (mmt)

other well known producers:
Aichi Steel Corporation
Al Tawarqee Steel Mills Karachi[citation needed], Pakistan
AK Steel, formerly Armco, Middletown, Ohio
BlueScope Steel, primarily in Australia
Companhia Siderúrgica Nacional, Brasil
Dongkuk Steel in Seoul, South Korea
Essar Steel, India
Erdemir in Karadeniz Ereğli, Turkey
Beshay Steel, Egypt
EZDK, Egypt
Ilyich Mariupol steel and iron works, Ukraine
Japan Steel Works, Japan
Jindal Steel, India
JSW Steel[citation needed], India
KVS Ispat[citation needed], India
Libyan Iron and Steel Company, Libya
Lone Star Steel Company
Outokumpu, based in Finland
Ovako[citation needed], Sweden & Finland
Pakistan Steel Mills Pakistan
Panzhihua, China
Rautaruukki, Finland
Salzgitter AG, Germany
SCM Holdings (divisions of), Ukraine
Sheffield Forgemasters[citation needed] in Sheffield, England
Sidetur, Venezuela
SSAB, Sweden
Stelco in Hamilton, Ontario
Ternium -- Hylsa in Mexico, Siderar in Argentina, & Sidor in Venezuela
Vizag Steel, India
Voestalpine, Austria