UB Universal Beam - Hot Rolled Structural Steel Section | British Standard
料号： UB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $480 | $480.00 |
| 10 | $460 | $4,600.00 |
| 50 | $430 | $21,500.00 |
| 200 | $395 | $79,000.00 |
| 1,000 | $365 | $365,000.00 |
UB 概述
A Universal Beam is a category of hot-rolled structural steel section whose cross-section forms the capital letter I - a tall vertical web flanked by two horizontal flanges. Within the British Standards family it sits alongside the Universal Column (UC), which has a near-square flange and is optimised for axial compression; the UB, in contrast, is optimised for bending about its strong axis. In the structural steel taxonomy, UBs fall under the parent category of hot-rolled sections, then I-sections, then beams, then long products used in construction. British Steel is the only UK manufacturer of UB sections and produces them under BES 6001 certification with CE and UKCA marking.
Key features of UB sections include parallel flanges for simpler connection detailing, a wide size range covering spans from approximately 1 m to over 30 m, and availability in multiple steel grades: S235JR, S275JR/J0/J2 and S355JR/J0/J2 to EN 10025-2:2004, plus equivalent ASTM A36, A572 Gr 50 and A992 Gr 50 grades for export markets. Lengths are typically supplied 6 m to 18 m as standard, with project-specific cutting and cambering available from service centres.
Technically, UB sections are rolled from continuously-cast billets through a sequence of breakdown, intermediate, and finishing stands that progressively shape the I profile. The parallel-flange geometry - distinct from the older tapered-flange RSJ - allows moment-resisting connections to use flush end-plates without major cope-cutting. Mass-per-metre values, section depths, flange widths, web and flange thicknesses, root radii, and second-moment-of-area values are tabulated in the British Steel Universal Beams datasheet.
Typical applications of UB sections include primary beams in multi-storey commercial buildings, rafters in portal-framed warehouses, crane girders in industrial facilities, bridge girders for short- to medium-span highway and rail crossings, and mezzanine floor joists. The choice between UB, UC, IPE, HEA and HEB depends on regional design code (BS 5950 / Eurocode 3 / AISC), loading type (predominantly bending vs axial) and connection detailing preferences.
When specifying a UB, the designer should confirm grade, length, tolerance class (EN 10034), and any supplementary requirements such as CE marking, third-party inspection, or impact testing at sub-zero temperatures. For seismic or fatigue-sensitive applications, through-thickness property guarantees (Z15/Z25/Z35 to EN 10164) should be considered.
This page synthesises British Steel datasheet values, regional equivalent mapping (UB vs IPE vs W-shape), and practical specification guidance not consolidated in a single manufacturer document.
直接替换替代料： UB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
UB 127x76x13
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
UB 203x133x25
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
UB 254x146x31
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
UB 305x165x40
✅ 直接替换📋 参考替代料（不在目录中）
UB 457x152x60
✅ 直接替换📋 参考替代料（不在目录中）
UB 533x210x82
✅ 直接替换📋 参考替代料（不在目录中）
UB 610x229x101
✅ 直接替换📋 参考替代料（不在目录中）
UB 规格参数
| Section Type | Universal Beam (UB) |
| Manufacturing Process | Hot rolled |
| Cross-Section Shape | I-section (parallel flanges) |
| Design Standard | BS 4-1 / EN 10034 |
| Steel Grades (EN 10025-2:2004) | S235JR, S275JR/J0/J2, S355JR/J0/J2 |
| Equivalent ASTM Grades | A36, A572 Gr 50, A992 Gr 50 |
| Serial Size Range (Depth) | 127 mm to 1016 mm |
| Flange Width Range | 76 mm to 305 mm |
| Mass Per Metre Range | 13 kg/m to 487 kg/m |
| Standard Length Range | 6 m to 18 m |
| Flange Geometry | Parallel inner and outer flange surfaces |
| Dimensional Tolerance | EN 10034 |
| Certification | BES 6001, CE and UKCA marked |
| Surface Condition | As-rolled (mill scale) |
| Through-Thickness Option | Z15 / Z25 / Z35 to EN 10164 (on request) |
| Typical Applications | Beams, rafters, bridge girders, crane girders |
UB standard 引脚配置指南
UB（standard 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： UB.
请参阅 数据手册 以查看完整引脚配置。
典型应用
UB 适用于 6 应用s: Multi-Storey Commercial Building Frames, Portal-Framed Warehouse Rafters, Crane Girder Beams, Short to Medium-Span Highway Bridge Girders, Mezzanine Floor Joists, Roof Purlins and Side Rails (with Stubs).
Multi-Storey Commercial Building Frames
UB sections form the primary beams and rafters in steel-framed commercial buildings where bending governs the member design. A UB 457 x 152 x 60 in S355JR typically spans 6-9 m between columns at floor level; its parallel flanges allow flush end-plate moment connections without cope-cutting, accelerating fabrication. Per the British Steel UB datasheet, depths from UB 254 to UB 610 cover most commercial floor-beam applications. Designers verify moment capacity (M_c,Rd), shear capacity (V_c,Rd) and deflection (typically span/360) per Eurocode 3.
推荐
Portal-Framed Warehouse Rafters
Portal frames in single-storey warehouses and industrial sheds use UB sections as rafters and columns to form clear-span structures typically 20-40 m wide. A UB 533 x 210 x 82 in S275JR or S355JR is a common rafter size; the tapered rafter concept can be achieved by stepping down to UB 457 x 152 x 60 at the eaves. The parallel-flange geometry simplifies the haunch detailing at the rafter-to-column joint, and the UB mass per metre values from the British Steel datasheet allow quick preliminary sizing.
推荐
Crane Girder Beams
UB sections are routinely used as crane girders in industrial buildings where overhead cranes impose heavy wheel loads and fatigue cycles. A UB 610 x 229 x 101 or UB 533 x 210 x 82 typically supports a 5-10 tonne crane; thicker flanges resist the localised wheel-load bending. UB's parallel flanges simplify the addition of crane-rail clamps and stiffener plates. The British Steel UB datasheet provides the elastic section modulus (Wel.y) required for combined bending plus fatigue checks per BS 5950 or Eurocode 3 Part 1-9.
推荐
Short to Medium-Span Highway Bridge Girders
UB sections are used as main girders in composite highway bridges for spans up to approximately 30 m. A UB 914 x 305 x 253 in S355J2 with sub-zero impact testing is typical for 25-30 m composite spans; the I-section geometry allows efficient shear stud placement on the top flange for composite action with a concrete deck. Designers check fatigue at the stud location and verify buckling resistance per BS 5400 or Eurocode 3 Part 1-9 and Part 2.
推荐
Mezzanine Floor Joists
UB sections in light serial sizes (UB 203 x 133 x 25 to UB 305 x 165 x 40) are widely used as mezzanine floor joists in warehouses, retail fit-outs and industrial platforms. The 6-9 m typical joist span is efficiently covered by a UB 254 x 146 x 31 in S275JR; UB parallel flanges simplify the welded shear-stud connection to the composite metal deck above. The British Steel UB datasheet provides mass per metre values for quick dead-load estimation.
推荐
Roof Purlins and Side Rails (with Stubs)
While dedicated cold-formed purlin sections are more common, heavy UB stubs (UB 127 x 76 x 13) are sometimes used as side rails on industrial buildings where impact resistance or robustness is required. The 127 mm depth and 13 kg/m mass suit short rafter spacings of approximately 1.5 m. UB's hot-rolled mill scale finish offers better corrosion resistance than cold-formed alternatives for exposed agricultural or coastal environments.
推荐
推荐产品汇总
工程参考数据： UB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | UB 254x146x31 | UB 457x152x60 | UB 610x229x101 |
|---|---|---|---|---|
| Section Type | Universal Beam (UB) | Universal Beam (UB) | Universal Beam (UB) | Universal Beam (UB) |
| Brand | British Steel | British Steel | British Steel | British Steel |
| Design Standard | BS 4-1 / EN 10034 | BS 4-1 / EN 10034 | BS 4-1 / EN 10034 | BS 4-1 / EN 10034 |
| Section Depth (mm) | Size-dependent | 254 mm | 457 mm | 610 mm |
| Mass per metre (kg/m) | Size-dependent | 31 kg/m | 60 kg/m | 101 kg/m |
| Steel Grades | S235/S275/S355 | S235/S275/S355 | S235/S275/S355 | S235/S275/S355 |
| Flange Geometry | Parallel flanges | Parallel flanges | Parallel flanges | Parallel flanges |
| Manufacturing Process | Hot rolled | Hot rolled | Hot rolled | Hot rolled |
| Certification | BES 6001, CE/UKCA | BES 6001, CE/UKCA | BES 6001, CE/UKCA | BES 6001, CE/UKCA |
关键差异点
- Parallel flange geometry for simplified connection detailing （对比 IPE section)
- UK mill-direct manufacture with BES 6001 certification （对比 Imported UB)
- Wide serial size range from 127 mm to 1016 mm depth （对比 UC (Universal Column))
设计说明
Designers must check UB sections to BS 5950-1 (legacy UK code) or Eurocode 3 (EN 1993-1-1) as applicable to the project location and specification. Section classification (Class 1-4 for cross-section, Class 1-3 for buckling) must be assigned before moment or compression resistance is calculated; UB parallel flanges typically produce Class 1 or 2 sections at common UB 254-457 sizes in S275/S355. Verify shear area, shear buckling resistance and moment-shear interaction per the relevant code.
A common pitfall when substituting UB across standards is assuming a UB has the same moment capacity as an apparently similar IPE or W-shape. UB serial sizes are not directly interchangeable with IPE or W-shape serial sizes - section depth, flange width, flange thickness and root radius all differ. Always check Wel.y (elastic section modulus) and Wel.y / mass ratio, not just mass per metre, when proposing a substitute. Use the British Steel UB datasheet or Structolution UB properties table as the authoritative source.
For structures subject to elevated temperatures (fire, chimney shafts, boiler houses), the strength reduction factors for UB steel grades must be applied per Eurocode 3 Part 1-2 or BS 5950-8. S275 loses approximately 50% of its yield strength at 550 C and S355 at approximately 540 C per EN 1993-1-2. For external steelwork in fire-resistant design, fire protection (intumescent coating, board, sprayed vermiculite) is typically required unless a fire engineering analysis justifies a bare-steel solution.
合规信息
UB is a structural steel section, not an electronic component; RoHS, REACH and AEC-Q100 do not apply. British Steel UB sections are BES 6001 certified for responsible sourcing and carry CE and UKCA marking per the Construction Products Regulation. Steel manufacture is conflict-minerals compliant per British Steel's annual reporting.
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