RS RB500 QST Rebar
High-yield reinforcement steel, SLS 375:2009 (RB500), BS 4449:2005 compliant
RS RB500 QST rebar is high-yield reinforcement steel with a minimum yield strength of 500 MPa, manufactured to SLS 375:2009 and compliant with BS 4449:2005+A2:2009, in sizes 8–20 mm and lengths of 6 m and 12 m.
| Grade | RB500 (minimum yield strength 500 MPa) |
|---|---|
| Process | QST — Quench and Self-Tempering (Thermex-type) |
| Standards | SLS 375:2009; compliant with BS 4449:2005+A2:2009 |
| Sizes | 8, 10, 12, 16, 18, 20 mm |
| Lengths | 6 m and 12 m (subject to stock) |
| Independent testing | University of Moratuwa — physical properties and chemical composition |
| Documentation | Mill test certificate (MTC) on request |
What is RB500 QST rebar?
RB500 is a high-yield reinforcement grade used in reinforced concrete, with a characteristic yield strength of 500 MPa. The QST (Quench and Self-Tempering) process gives the bar a tough tempered-martensite outer ring and a ductile ferrite-pearlite core, combining high strength with good ductility and weldability.
Independent testing
- University of Moratuwa test report — physical properties and chemical composition for RS RB500 QST rebar in sizes 8, 10, 12, 16, 18 and 20 mm.
- Scope includes yield stress, tensile strength, elongation, mass per metre, bend/rebend, rib geometry, and chemical composition.
Where it is used
- Foundations, columns, beams, and slabs in residential and commercial buildings.
- Bridges, roads, and other infrastructure requiring high-strength reinforcement.
- Any reinforced-concrete element where strength, ductility, and bond matter.
Frequently asked questions
What does RB500 mean?
RB500 denotes a ribbed reinforcement bar with a minimum characteristic yield strength of 500 MPa, suitable for high-strength reinforced concrete.
Is RS RB500 weldable?
Yes. The QST process produces a low-carbon-equivalent bar that supports good weldability and ductility while maintaining 500 MPa yield strength.
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.