| January 1932 | Nippon Soda Naoetsu Plant commenced production of Fe-Mn and Fe-Si electrodes |
|---|---|
| August 1934 | Production of special alloys commenced |
| July 1939 | Renamed Nippon Soda Naoetsu Steelworks |
| December 1947 | Production of heat-resistant and acid-resistant steel casting products commenced |
| December 1949 | Steel Division of Nippon Soda was split off to create Nisso Steel Mfg. Co., Ltd. |
| January 1970 | Nisso Steel acquired Pacific Nickel and changes name to Pacific Metals |
| October 1971 | New shell-mold casting plant commenced operations |
| March 1974 | Lost wax precision casting facility commenced operations |
| January 1980 | Plants formally accredited by Nippon Kaiji Kokai (ClassNK), followed by Lloyd’s Register in May |
| June 1981 | Furan casting facility commenced operations |
| December 1983 | Linac high-energy X-ray transmission inspection line installed |
| July 1984 | Pacific Special Alloy Castings founded as an offshoot of Pacific Metals with initial capitalization of 250 million yen[2.1 million USD /1USD=120JPY] |
| February 1985 | Production of BM stainless steel joints (in-ground water pipe joints, approved by the Japan Water Works Association (JWWA) and manufactured using materials designated in Tokyo Metropolitan Government specifications) |
| June 1986 | Large three-dimensional measuring equipment (layout machines) installed |
| July 1987 | 1.5-ton high-frequency induction furnaces installed |
| September 1989 | Capitalization boosted to 490 million yen |
| January 1990 | Wood pattern facility completed; automated molding line for machine castings commenced operations in September |
| December 1990 | First EBP (Electron Beam Perforation) unit installed |
| March 1993 | 1-ton high-frequency induction furnaces installed |
| December 1993 | First double-column five-face machining center installed |
| November 1994 | Vectoron spatial coordinate measuring system installed |
| August 1995 | Extensions to lost wax precision casting facility completed |
| May 1998 | Large NC vertical turning lathe installed Second double-column five-face machining center installed |
| July 1998 | 3-d CAD/CAM system installed |
| October 1998 | Second EBP (electron beam processing) unit installed |
| March 1999 | Awarded ISO9001 and ISO9002 accreditation |
| October 1999 | Taiwan office opens (Nissho Pacific Special Alloy Castings Taiwan Ltd.) |
| December 2003 | Pacific Sowa set up as operating holding company, combining operations with Pacific Special Alloy Casting, Pacific Steel Mfg. and Yonago Steel Co,Ltd. |
| March 2005 | 5-ton vacuum melting induction furnace installed |
| August 2005 | FARO 3-D digitizer installed |
| April 2006 | NC wood machining center installed |
| April 2008 | G-5 heat treatment furnace upgraded with larger capacity and ability to accommodate special alloys (maximum 1,250°C) |
| May 2008 | Super duplex stainless steel (SDSS) production system developed |
| January 2009 | Certified under CE Marking scheme |
| May 2009 | Alkali phenol molding facility commenced operations |
| July 2010 | NC horizontal boring and milling machine installed |
| September 2011 | 4-ton high-frequency induction furnace installed |
| December 2011 | AOD (Argon Oxygen Decarburization) system installed |
| December 2013 | G-8 heat treatment furnace upgraded to accommodate special alloys (maximum 1,250°C) |
| October 2014 | OSHMS occupational health and safety management system accreditation |
| April 2015 | Tokyo head office moved to Marunouchi, Tokyo |