HSS 18 × 12 × ⅜" (457.2 × 304.8 × 9.53 mm) ASTM A500 Grade B/C Rectangular HSS
457.2x304.8x9.53mm Steel rectangular hss in ASTM A500 Grade B, Grade C to ASTM A500/A500M, with an uncoated steel surface suitable for further processing or painting. Nominal weight 109.323436 kg/m.
Minimum order
Minimum 10 t per size. If the size is already in the current production cycle, we can accept orders from 5 t. Standard length 6 m; 4–12 m on request. We confirm the minimum, lead time and grade in your quote.
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Minimum order: 10 t per size (from 5 t if the size is in production)
Applications & Usage
This extra heavy-duty industrial Steel rectangular hss is commonly specified for heavy structural supports, load-bearing frames, and demanding industrial applications. The 9.53mm wall thickness provides exceptional structural integrity while maintaining workability. The natural mill finish provides a cost-effective solution for applications where aesthetics are secondary. Available in standard lengths of 6m, this profile can be easily cut, drilled, and welded to suit your specific requirements.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 457.2mm × 304.8mm × 9.53mm |
| Weight per Meter | 109.323 kg/m |
| Material | Steel |
| Alloy/Grade | ASTM A500 Grade B, C |
| Standard | ASTM A500/A500M |
| Standard Length | 6m |
| Designation (inch) | HSS 18 × 12 × ⅜ |
| Weight (lb/ft) | 73.46 lb/ft |
| Minimum Order per Size | 10 t |
| Cut-to-Length Range | 4000 – 12000 mm |
Section Properties
Calculated with the AISC design wall thickness (0.93 × nominal); mass and length per tonne use the nominal wall.
| Property | Value |
|---|---|
| Cross-sectional area(A) | 130 cm² |
| Second moment of area(Ix) | 38650 cm⁴ |
| Second moment of area(Iy) | 20784 cm⁴ |
| Radius of gyration(ix) | 17.2 cm |
| Radius of gyration(iy) | 12.6 cm |
| Elastic section modulus(Wel,x) | 1691 cm³ |
| Elastic section modulus(Wel,y) | 1364 cm³ |
| Plastic section modulus(Wpl,x) | 2021 cm³ |
| Plastic section modulus(Wpl,y) | 1534 cm³ |
| Torsional inertia constant(It) | 42515 cm⁴ |
| Torsional modulus constant(Ct) | 2241 cm³ |
| Surface area per metre(As) | 1.49 m²/m |
| Length per tonne | 9.15 m |
Grade strength and capacity
Minimum strength of each grade this size is rolled in, with the indicative capacity calculated on the AISC design wall (0.93 × nominal).
| Grade | Min. yield | Tensile | Bending Wel·fy | Axial A·fy |
|---|---|---|---|---|
| Grade B | 46 ksi (315 MPa) | 58 ksi (400 MPa) | 533 kNm · 393 kip·ft | 4092 kN · 920 kips |
| Grade C | 50 ksi (345 MPa) | 62 ksi (425 MPa) | 583 kNm · 430 kip·ft | 4482 kN · 1008 kips |
Indicative values from nominal dimensions: Wel × fy and A × fy, without buckling, cross-section class or partial safety factors. Not a design check.
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