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Materials & Specificationsaka: structural steelaka: hot-rolled steelaka: carbon steel

Steel

In Plain English

The strongest and most versatile structural metal used for building frames, beams, and columns.

Definition

Steel is a ferrous alloy of iron and carbon that is the primary structural material for high-rise buildings, long-span structures, bridges, and industrial facilities. Structural steel shapes include wide-flange beams, hollow structural sections, channels, and plates. Steel is specified by grade (such as ASTM A992 or A36), yield strength, and tensile strength.

Why It Matters in Bidding

Steel is usually one of the largest single line items on a structural bid and its pricing is volatile, so estimators must lock current mill and fabricator quotes rather than rely on historical numbers. Grade and shape callouts directly affect both material cost and connection labor, and a misread specification can leave a steel package badly underbid or noncompliant with the structural drawings.

Example

An estimator pricing a four-story frame requests a firm quote from a fabricator valid for 30 days, knowing steel pricing can move before award and that the proposal needs an escalation note to protect the markup.

Related Terms

RebarGalvanized SteelMetal StudFastener

Frequently Asked Questions

Steel is a globally traded commodity influenced by raw material costs, mill capacity, tariffs, and freight, so quotes can shift week to week. Estimators protect themselves with time-limited fabricator quotes and escalation clauses, and they confirm pricing again at award if the bid validity period is long.
The grade specifies yield and tensile strength along with chemistry. A992 is the modern standard for wide-flange shapes, while A36 is common for plates and angles. The grade affects availability and price, and substituting a different grade without engineer approval risks rejection and rework.
Estimators count each member by shape and size, calculate length, and convert to weight using the section's pounds-per-foot value, since steel is priced by weight. Connections, bolts, welds, shop coatings, and erection are estimated separately, because fabrication and field labor often rival the raw material cost.

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