Siam Yamato Steel Co Ltd

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Siam Yamato Steel Co Ltd manufactures hot rolled structural steel products in Thailand. It produces H sections, I-sections, channels, angles, sheet piles, universal beams, universal columns, parallel flange channels, universal bearing piles, and H-pile shapes. Siam Yamato Steel Co Ltd was founded in 1992 and is based in Bangkok, Thailand. It has factory in Rayong Province and a warehouse in Chonburi, Thailand. Siam Yamato Steel Co Ltd operates as a subsidiary of Mitsui & Co Ltd.


  • Headquarter Building 2, 7th Floor, 1 Siam Cement Road, Bangsue  

Town, State, Country

  • Bangkok, Thailand  


  • 10800 
  • Managing Director Jaydsada Plungmanee
  • Year Established 1992
  • End User Industries Construction, oil and gas


  • ISO 14001
  • ISO 9001
  • OHSAS 18001
  • ASTM standard
  • ISO 17025


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