Deformed Bars or sometimes is known as DB which is another kind of rebars. Deformed Bars are usually used on concrete construction rather steel construction and mostly they are used for pillar and pill construction as it can support weight and they are high friction endurance. Their grades are SD30, SD40, and SD50 which are well known in Thailand. These 3 grades are different in terms of their functions included flexibility and chemical. For speculation, its diameter is between 10mm and 32 mm; its length is 10m and 12m. However, nowadays, many factories started to stop producing SD30 and factories have supplied only SD40 Our deformed bars passed standard included TIS24-2548, JIS, BS, and ASTM  

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