TOR is a brand name – Toristeg Steel Corporation of Luxembourg. Their name (TOR) became synonymous with Cold Twisted Deformed (CTD) steel bars due to popularity. TOR is also used as a synonym for reinforcement bars in general.
TOR and TMT are both high strength reinforcement steel bars.
History : Round plain steel bars dominated the construction industry till seventies. Thereafter CTD (or TOR Steel) dominated the industry till nineties. Nowadays TMT or hot treated bars are the most popular due to its advantages over CTD (TOR) such as high strength and corrosion resistance.
Some of the popular grades of high Strength steel bars (either hot or cold rolled) are listed in the following table.
| American Standard (ASTM A 615) | Euro Standard (DIN 488) | British Standard (BS 4449: 1997) | Indian Standard (IS: 1786) |
| Grade 75 (520) | BST 500 S | GR 460 A | Grade Fe – 500 |
| Grade 80 (550) | BST 500 M | GR 460 B | Grade Fe – 550 |
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