Why steel and TMT bars require certification
TMT (thermo-mechanically treated) bars and structural steel products go directly into building and infrastructure construction, where a strength or ductility shortfall isn't discovered until it matters most — which is why this category has been under compulsory ISI certification for years.
What's covered
Coverage includes TMT reinforcement bars across their standard grades and diameters, along with other structural steel product categories, each assessed against the applicable Indian Standard for that specific product form.
What testing focuses on
Testing typically evaluates tensile strength, yield strength, elongation, and bend/re-bend properties — the mechanical characteristics that determine how the steel performs under structural load, tested both at certification and through ongoing surveillance.
The certification process
The ISI route applies: confirm the applicable standard for your specific steel products and grades, document your manufacturing process (including for re-rollers using purchased billets), submit samples for mechanical testing, undergo factory inspection, and receive your licence with ongoing surveillance.
Considerations for re-rollers
Steel re-rolling mills that don't operate a full furnace-to-finished-product line can still get certified, but need to clearly document their specific process and raw material sourcing so BIS can assess the actual production chain they're certifying — this is worth clarifying with your consultant early rather than assuming the same documentation approach as an integrated mill applies.
FAQs
Do different TMT bar diameters need separate testing?
Certification typically needs to demonstrate conformance across the range of diameters and grades you intend to produce and sell under the licence, so your testing scope should reflect your actual product range.
Can a steel re-roller get certified without owning a furnace?
Yes, but the application needs to clearly document your specific manufacturing process and raw material sourcing — we help re-rollers structure this correctly for BIS review.
This article is general information about BIS/NABL compliance, not legal or regulatory advice. Requirements change — confirm current applicability for your specific product before acting.
Need help with this?
BIS ISI Certification
End-to-end support for ISI Mark Certification under BIS.