Question 1

When is a built-up section better than a rolled section?

Accepted Answer

Built-up sections (welded from plate) are right when the required cross-section doesn't exist as a rolled section, or when the span/load combination would need a non-standard heavy rolled. Big industrial buildings, plate girders, and crane runways routinely use built-ups. Rolled sections are the cheaper choice when they exist for the load.

Question 2

Which steel grade — E250 or E350?

Accepted Answer

E250 (Fe410) is the workhorse for general structural work. E350 (Fe490) gives 40 % higher yield and is justified when section depth is constrained or weight is critical. Heavy industrial buildings often mix the two — E250 for columns, E350 for trusses and crane beams.

Question 3

What welding qualification do you operate?

Accepted Answer

Welders are qualified to AWS D1.1, ASME IX and EN ISO 9606. Procedures (WPS, PQR) are pre-approved by the customer's TPI on first contract and shared as part of the QA dossier. We employ in-house welding inspectors qualified to AWS CWI / CSWIP 3.1.

Question 4

How are built-up girders transported overseas?

Accepted Answer

Girders up to 12 m ship inside 40 ft containers; longer girders go on flat-rack containers with crane-loading. Coastal shipping from Indian ports to GCC and East Africa is well-established — we use Mundra, Pipavav, Mumbai, Chennai, Visakhapatnam depending on destination.

Question 5

What is the inspection regime on a structural-steel batch?

Accepted Answer

Plate UT before fabrication, fit-up checks before welding, visual on every weld, MPI/UT on critical welds (to the project's NDE schedule), galvanizing thickness on every member, and dimensional check before painting. Reports are batch-linked.

Question 6

Is shop-priming or full painting available?

Accepted Answer

Both. Shop-priming with a zinc-rich epoxy primer is the most common (60–80 µm) — site applies the top coat. Full system painting (primer + intermediate + top) is available where the buyer wants a finished structure from factory. We share the paint system spec for approval.

Question 7

How is heavy steel sized for blast and seismic loads on petrochem sites?

Accepted Answer

Petrochem structures often need blast-resistant connections (BRP) and seismic ductility detailing. We work to API 752/753 and ASCE 7 — connection details, bolt grades and stiffener arrangements are reviewed with the buyer's structural engineer before fabrication.

Question 8

Can built-up sections be supplied with embedded plates and lifting lugs?

Accepted Answer

Yes — embed plates (for column bases, slab connections) and lifting lugs are welded as part of the section. For complex assemblies (truss with built-up bottom chord and rolled web members), the whole assembly is shop-fabricated and shipped as a labelled crate.

Question 9

What's the typical lead time for 500 tonnes of built-up steel?

Accepted Answer

500 tonnes of built-up plate girders typically take 10–14 weeks from raw-material order to last batch dispatch. Galvanizing slot booking is the long-pole item — we hold galvanizing capacity against confirmed contracts.

Question 10

Which sectors are the largest buyers?

Accepted Answer

We supply precision components to steel mill expansions (Tata Steel, JSW, AMNS), cement plant greenfields, fertiliser infrastructure revivals, and refinery vacuum tower projects. Each tenders for 500–5,000 tonnes per project and that volume justifies our in-house machining and fast-turnaround lines. GCC industrial city build-outs are a growing export segment for us.

Length tolerance	±3 mm on standard lengths
Width tolerance	±1 mm
Thickness tolerance	±0.15 mm (IS 1079)
Straightness	≤ 1 mm per 1 m
Galvanizing coat	85 µm min (ASTM A123)
Squareness	≤ 1 mm per 100 mm

Built-Up Sections & Girders

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