ASTM A36 HRC HOLLOW SECTION

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​​Scope​​: Covers carbon steel plates, shapes, and bars for structural applications (bridges, buildings).

​​Key Properties​​:

​​Min. Yield Strength​​: 250 MPa (36 ksi)

​​Min. Tensile Strength​​: 400–550 MPa (58–80 ksi)

​​Elongation​​: 20–23% (based on specimen size).

​​Chemistry​​ (Max %):

​​Carbon​​: 0.26%

​​Manganese​​: 0.60–0.90%

​​Phosphorus/Sulfur​​: ≤0.04% each

(Iron makes up the balance).

​​HRC​​: Stands for ​​Hot Rolled Commercial quality​​, ​​Cold-formed​​.

​​Form​​: Hollow structural sections (HSS) created by cold-forming flat-rolled steel (hot-rolled coil) into circular, square, or rectangular tubes.

​​Manufacturing Process​​:

Hot-rolled steel coils are unrolled.

Cold-formed into shape via roll forming or press braking.

Welded longitudinally (seam welded).

Sizing/finishing to final dimensions.

​​Strength​​: Matches ASTM A36 requirements:

Yield: ≥250 MPa | Tensile: 400–550 MPa.

​​Ductility​​: Suitable for bending/welding.

​​Chemistry​​: Similar to plates/bars but optimized for formability. Low carbon ensures weldability.

​​Shapes​​: Square (SHS), Rectangular (RHS), Round (CHS).

​​Size Range​​:

​​Square：        OD:20MM×20MM--1200MM×1200MM          WT:1.2-60MM

Rectangular​​:  OD:20MM×30MM--1200MM×1500MM          WT:1.2-60MM

Circular: ERW:1/2 inch-24inch

                LSAW:406MM-1420MM

                SSAW:219MM-4020MM

                    SMLS:1/2inch-1060MM

​​Tolerances​​: Governed by ASTM A1085 or A500 for dimensions, straightness, and squareness.

​​HRC ≠ ERW​​:

ERW (Electric Resistance Welded) is the process used to weld the seam.

HRC refers to the ​​hot-rolled coil​​ base material.

​​"HRC" vs. Hardness (Rockwell C)​​:

​​Confusion Alert​​: "HRC" here ≠ Rockwell hardness scale.

​​A36 vs. A500/A1085​​:

A36: Material standard (chemistry/strength).

A500/A1085: Product standards for HSS (tolerances/testing).

A36 HRC HSS follows A36 material properties but uses A500/A1085 for fabrication.

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​​Structural Frames​​: Beams, columns in buildings.

​​Support Structures​​: Racks, frames, conveyors.

​​Architectural​​: Railings, furniture, aesthetic elements.

​​Machinery​​: Frames, guards, equipment bases.

​

​​Cost-Effective​​: Cheaper than alloy steels.

​​Weldability​​: Low carbon content prevents cracking.

​​Formability​​: Easily cut, drilled, welded.

​​Availability​​: Widely stocked globally.

​​Corrosion​​: Not corrosion-resistant; requires painting/galvanizing.

​​Strength Limits​​: Not suitable for high-stress applications (e.g., offshore).

​​Cold-Forming Effects​​: Work hardening may cause slight property variations near corners.

​​Mill Certs​​: Ensure traceability to A36/A500/A1085.

​​Key Tests​​:

Tensile strength, yield strength, elongation.

Bend tests (for ductility).

Hydrostatic or ultrasonic weld tests.

​​Design Tip​​: Optimize by considering A1085 (better tolerances/yield strength).

​​Sourcing​​: Specify both material (A36) and shape standard (A500 or A1085).

​​Replacement​​: A500 Gr C or A1085 offer higher strengths if needed.

ASTM A36 HRC Hollow Section combines the cost-effectiveness of mild carbon steel with the versatility of cold-formed HSS. It's ideal for structural applications needing straightforward fabrication and welding. Always confirm your supplier's interpretation of "HRC" and request compliance with ASTM A500 or A1085 for seamless integration into designs. For higher performance, explore A1085-compliant sections.