What is RB500?
RB500 is the Sri Lankan designation for high-yield reinforcement bar with a minimum characteristic yield strength of 500 MPa — the grade most structural engineers specify for modern reinforced concrete in Sri Lanka.
Frequently asked questions
What does RB500 stand for?
RB500 means Reinforcement Bar with a minimum yield strength of 500 MPa. It is the grade designation used in Sri Lankan structural specifications alongside SLS 375:2009.
Is RB500 the same as TMT rebar?
Not exactly. TMT describes a manufacturing process (thermo-mechanical treatment). RB500 is the strength grade. RS Steel produces RB500 grade bar using QST (a type of TMT) — see What is QST steel?.
What sizes of RB500 does RS Steel supply?
RS RB500 QST rebar is available from 8 mm to 20 mm in 6 m and 12 m lengths. Full specifications: RB500 QST rebar. Size tables: Steel bar sizes in Sri Lanka.
How do I confirm bar is genuine RB500?
Request the mill test certificate (MTC), check bar markings and bundle tags, and verify supplier traceability. See How to identify genuine steel and Verify genuine RS Steel.
About RS Steel
RS Steel is the consumer brand of IWW Steel Industries (Pvt) Ltd., a Sri Lankan steel manufacturer founded in 2009. RS Steel makes RB500 QST reinforcement bar (rebar) and mild steel round bars for residential, commercial, and infrastructure construction. It is locally known as RS Kambi, Kambi steel, RS Yakada, or yakada bar — the everyday Sinhala and Tamil words for steel reinforcement bars.
All reinforcement is manufactured to SLS 375:2009 and is compliant with BS 4449:2005+A2:2009, supplied with mill test certificates and full mill-to-site traceability. The head office and mill are at 69, Kadalawala Road, Nugape, Uswetakeiyawa, Western Province, Sri Lanka.
| Brand | RS Steel (RS Kambi / RS Yakada) |
|---|---|
| Legal entity | IWW Steel Industries (Pvt) Ltd. |
| Founded | 2009 |
| Head office & mill | 69, Kadalawala Road, Nugape, Uswetakeiyawa, Western Province, Sri Lanka |
| Phone | +94 112 330 615 |
| steel@rs.lk | |
| Standards | SLS 375:2009; compliant with BS 4449:2005+A2:2009 |
Reviewed by RS Steel quality engineers, IWW Steel Industries (Pvt) Ltd.