The steel section 250×31.4 UB falls under the section category of Universal Beams. The section 250×31.4 UB is denoted by the Standard Industry section notation – 250UB31.4. In Australia and New Zealand, the nominal section dimensions and weights of hot-rolled sections are defined in Appendix D of AS/NZS 3679.1:2016 Structural Steel – Hot-Rolled Bars and Sections. These dimensions are used to calculate the design **section properties** of this section.

**Summary of Geometrical and Sectional Properties of 250×31.4 UB**

Section properties of** **250UB31.4 in metric units and imperial units (US Customary Units) are summarised in the table below

Property Component | Metric Units | Imperial Units (US Units) |

Depth of section, d | 25.20 cm | 9.92 in |

Breadth of section or Flange width, b | 14.60 cm | 5.75 in |

Flange thickness, t_{f} | 0.86 cm | 0.34 in |

Web thickness, t_{w} | 0.61 cm | 0.24 in |

Root radius, r | 0.89 cm | 0.35 in |

Total Area of section, A | 40.11 cm^{2} | 6.22 in^{2} |

Second moment of area about x-axis, Ixx | 4469.00 cm^{4} | 107.37 in^{4} |

Second moment of area about y-axis, Iyy | 446.70 cm^{4} | 10.73 in^{4} |

Radius of gyration about x-axis, r_{x} | 10.56 cm | 4.16 in |

Radius of gyration about y-axis, r_{y} | 3.34 cm | 1.31 in |

Elastic section modulus about x-axis, Zxx | 354.70 cm^{3} | 21.65 in^{3} |

Elastic section modulus about y-axis, Zyy | 61.19 cm^{3} | 3.73 in^{3} |

Plastic section modulus about x-axis, Sxx | 397.50 cm^{3} | 24.26 in^{3} |

Plastic section modulus about y-axis, Syy | 94.19 cm^{3} | 5.75 in^{3} |

Warping Constant, I_{w} | 66160.00 cm^{6} | 246.37 in^{6} |

Torsional Constant, J | 8.93 cm^{4} | 0.21 in^{4} |

Mass of section, M | 31.49 kg/m | 21.16 lb/ft |

**Summary of Geometrical and Sectional Properties of 250×31.4 UB in millimetres, mm**

Section properties of 250UB31.4 in millimeters, mm are summarised in the table below

Property Component | Metric Units |

Depth of section, d | 252.00 mm |

Breadth of section or Flange width, b | 146.00 mm |

Flange thickness, t_{f} | 8.60 mm |

Web thickness, t_{w} | 6.10 mm |

Root radius, r | 8.90 mm |

Total Area of section, A | 4011.00 mm^{2} |

Second moment of area about x-axis, Ixx | 44690000.00 mm^{4} |

Second moment of area about y-axis, Iyy | 4467000.00 mm^{4} |

Radius of gyration about x-axis, r_{x} | 10.56 cm |

Radius of gyration about y-axis, r_{y} | 33.37 mm |

Elastic section modulus about x-axis, Zxx | 354700.00 mm^{3} |

Elastic section modulus about y-axis, Zyy | 61190.00 mm^{3} |

Plastic section modulus about x-axis, Sxx | 397500.00 mm^{3} |

Plastic section modulus about y-axis, Syy | 94190.00 mm^{3} |

Warping Constant, I_{w} | 66160000000.00 mm^{6} |

Torsional Constant, J | 89290.00 mm^{4} |

Mass of section, M | 31.49 gm/mm |

**Geometry of 250×31.4 UB in mm – SI units **

Total depth of section = Section depth, d = 252.00 mm

Total breadth of section = Section width, b = 146.00 mm

Flange thickness, t_{f} = 8.60 mm

Web thickness, t_{w} = 6.10 mm

Root radius, r = 8.90 mm

Total Area of section, A = 4011.00 mm^{2}

Mass of section, M = 31.49 kg/m

**Sectional Properties of 250×31.4 UB in mm – Metric units**

The Second Moment of Area or Second Area Moment or Quadratic Moment of Area or Area Moment of Inertia or moment of Inertia about x-axis, I_{xx} = 44690000.00 mm^{4}

The Second Moment of Area or Second Area Moment or Quadratic Moment of Area or Area Moment of Inertia or moment of Inertia about y-axis, I_{yy} = 4467000.00 mm^{4}

Radius of gyration about x-axis, r_{x} = 105.60 mm

Radius of gyration about y-axis, r_{y} = 33.37 mm

Elastic section modulus about x-axis, Z_{xx} = 354700.00 mm^{3}

Elastic section modulus about y-axis, Z_{yy} = 61190.00 mm^{3}

Plastic section modulus about x-axis, S_{xx} = 397500.00 mm^{3}

Plastic section modulus about y-axis, S_{yy} = 94190.00 mm^{3}

Warping Constant, I_{w} = 66160000000.00 mm^{6}

Torsional Constant, J = 89290.00 mm^{4}

**Structural Design Parameters of 250×31.4 UB or 250UB31.4 in mm – Metric units**

Based on the design application and structure type, Universal Beams are to be designed in accordance with AS-NZS 5100.6-2017 and AS 4100:2020. Another design guide available for designers is AISC – Design of Structural Connection 4^{th} Edition 1994 published by Australian Steel Institute.

Depth of web between flanges, d_{w} = 234.80 mm

Surface area = 1.06 m^{2}/m

Ratio of outstanding flange/thickness of flange = 8.488

Web slenderness ratio or ratio of clear web depth/thickness of web = 38.490

Buckling Parameter of section = 0.879

**Trivia – Hot-rolled Universal Beam Structural Steel Sections**

Grade 300 Steel is the most common and standard grade manufactured by most manufacturers in Australia for hot rolled Structural Steel Sections. Depending on project and client demands, other grades available in the market are 300L0, 300L15, 350, 350L0 & 350L15.

Common stock lengths available in the market are 9.0m, 10.5m, 12.0m, 13.5m, 15.0m, 16.5m, 18.0m & 20.0. However, some lengths may not be available depending on the supplier.

Hot-rolled Structural Steel Sections are usually supplied in Mill Finish. Although, other finishes are available on demand or special orders.

Universal Beams are available in section depths of 150mm, 180mm, 200mm, 250mm, 310mm, 360mm, 410mm, 460mm, 530mm & 610mm.

**FAQs on 250×31.4 UB or 250UB31.4 **

**How much does it cost to cut**

**beam?****250UB31.4**An indicative cost of cutting **250UB31.4** beam in Australia is $18/cut. However, the final rates will depend largely on volume of order and tools used.

**What is the cost of**

**per linear metre?****250UB31.4**In Australia, the retail selling rate of **250UB31.4** is $125.38 per linear metre for raw/mill finish and $138.58 per linear metre for primed finish, excluding GST and volume discounts.

**What is the cost of drilling holes**

**beam?****250UB31.4**Suppliers can charge up to $3 per hole for drilling in hot rolled beams in Australia.

**What is the weight of 250UB31.4 per meter?**

The weight of 250UB31.4 per meter is 31.49 kg/m

**What is the cross-sectional area of 250UB31.4?**

The cross-sectional area of 250UB31.4 is 4011.00 mm^{2}

**What is the exposed surface area of 250UB31.4 per meter?**

The exposed surface area of 250UB31.4 per meter is 1.06 m^{2}/m

*Data on this page has been verified and validated with multiple data sources and reviewed regularly for correctness and accuracy, if you have any comments or suggestions, please reach out to us** **here**.*