Company Groups


Siam Steel Gratings Co., Ltd. (SSG) was founded in June 1988 under the name ‘Thai Steel Grating Co., Ltd.’ and began operations in January 1989. In October 1991, Thai Steel Grating Co., Ltd. joined with Progress Manufacturing Pte. Ltd., the largest hot dip galvanizer in Singapore, to form Siam Steel Galvanizing Co., Ltd., which offers galvanizing services to SSG and other customers. In September 1994, Thai Steel Gratings changed its name to “Siam Steel Gratings Co., Ltd.”, under which name it has been well-known until today.

SSG is the largest manufacturer of high-quality steel gratings in Thailand. Our products are used in a multitude of industrial fields. With our new automatic forge-welding machine and newly purchased facilities, SSG is able to produce more than 22,000 sq.m. of steel gratings per month.The company distinguishes itself from
other producers by offering ‘SSG’ gratings, which are manufactured by a special welding machine, created with Austrian technology. Siam Steel Gratings’ products are known for their unique flexibility and control, thanks to the company’s exceptional production process – electro-forged welding. Capable of widening or narrowing bearing bars and cross bars, such a process is electrically and hydraulically powered. The process fuses the metals
together to give maximum resistance from twisting, wearing and distortion. By using this technology,
considerable shaping can be done without destroying or reducing the rigidity and strength of the metal.

Over the years, to support the increase in production and sales of steel gratings, SSG has established its second galvanizing plant adjacent to its steel-grating factory. The first galvanizing plant was established in 1991 under the name Siam Steel Galvanizing. The galvanizing plants not only support the galvanization of gratings for SSG, but also offer galvanizing services for various kinds of steel to customers. In October 1991, Thai Steel Grating Co., Ltd. joined with Progress Manufacturing Pte. Ltd. – the largest hot dip galvanizer in Singapore – to form Siam Steel Galvanizing. Siam Steel Galvanizing Co., Ltd. and Rayong Galvanizing Co., Ltd. support the galvanization of gratings for SSG, and serve a wide variety of other industries in
Thailand as galvanizing specialists.




Siam Steel Tower

Siam Steel Tower Co., Ltd., established in 1996, has successfully achieved meritorious ISO 9001:2000 quality management system certification in terms of product design and production of transmission line towers, communication towers and steel supports in substation. In 2003, the company set up a new factory located at Nong Khae district of Saraburi province. This factory, covering an area of 35 rai (5.6 hectares), had a total production capacity of 1,200 metric tons per month. Later the company built more factory buildings and purchased additional equipment and machinery with an aim to expand its production capacity to 3,500 metric tons per month. All constructions and purchases were fully completed on July 1, 2006. With a working area of 2x3,880 square meters and stockyard area of 13,000 square meters, the plant is one of Thailand's largest steel tower manufacturers.

Siam Steel Tower provides services and quality products through a combination of state-of-the-art technology and industrial experience, including telecommunication towers, transmission line, towers, substation structures, electrical hardware, and radar towers.

Siam Steel Galvanizing

Galvanizing services of Siam Steel Galvanizing Co., Ltd. is now well-accepted by EGAT (Electricity Generating Authority of Thailand), international contractor companies and large-scale steel structure contractors and manufacturers in Thailand. The zinc kettles of Siam Steel Galvanizing Co., Ltd. are the largest ones in Thailand.

PWH Thailand

Engineering, design, procurement, fabrication, installation, commissioning, testing operation and maintenance for coal and ash handling systems, substation and switchyards, power transmission lines, renewable energy power plants, car parks

CHC Engineering

Construction of high voltage transmission lines and power stations, site construction and MEA at all parts of the Thailand

Rayong Galvanizing

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Head Office
65/147 18 Fl., Chamnan Phenjati Business Centre, Rama 9 Rd, Huai Khwang, Huai Khwang Bangkok 10310

Email :

Tel.: (+66-2) 246-9966/77/88

Fax: (+66-2) 247-9944