H beam is one of the most widely used main materials in steel structure projects. Its quality directly determines the safety and installation accuracy of the entire structure. When raw materials arrive on site, loose inspection can lead to serious deviations in subsequent fabrication, welding, and even field installation, resulting in rework and safety risks. Therefore, a strict and standardized acceptance procedure must be established. The following six key points should be checked one by one.

First, check the length of the H  beam

Measure the actual length with a steel tape against the purchase contract and cutting list. The allowable deviation is generally within 0 to +20 mm (according to GB/T 11263). This prevents material waste or splicing issues caused by insufficient length.

Second, check the flange and web thickness

Use an ultrasonic thickness gauge or a micrometer. Take measurements at least 200 mm from the end. Measure at least three points per plate. The negative thickness deviation must not exceed the standard specified value.

 Allowable deviation (H-beam) – Length: ≤7000 mm, 0 to +60 mm; >7000 mm, for each additional 1 m or part thereof, add +5 mm to the positive deviation above. (I-beam) ≤8000 mm, +50 mm; >8000 mm, +80 mm. Thickness: (H-beam) according to GB/T 11263 Table 3; (I-beam) according to GB/T 706.

Third, verify the cross  section dimensions (height and width)

Measure the section height (web height) and flange width with a vernier caliper or a large caliper. Excessive deviation may cause mismatch of connecting parts or uneven force distribution.

 Fourth, check the web center offset

The web should be symmetrical to the flange centerline. Measure the maximum offset between the web center and the flange center. Too much offset will affect member alignment and weld quality.

Allowable deviation: (H-beam) For H ≤ 300 and B ≤ 200, ±2.5 mm; for H > 300 and B > 200, ±3.5 mm.

Fifth, inspect the perpendicularity of the flange plate to the web

Press one side of a square against the flange plate and the other side against the web. Observe the gap. Excessive perpendicularity deviation will cause uneven contact surfaces at beam column connections.

Allowable deviation: (H-beam) according to GB/T 11263 Table 3; (I-beam) W ≤ 0.15d.

Sixth, measure the straightness deviation of the H  beam (including lateral bending and camber)

Place the member flat. Pull a wire or use a straightedge along the length direction. If the straightness deviation exceeds L/1000 and is greater than 5 mm, the material must be rejected or straightened.

 Allowable deviation: (H-beam) according to GB/T 11263 Table 3; (I-beam) bending per meter ≤ 2 mm, total bending ≤ 0.20% of total length.

In summary, H beam acceptance is not a routine formality but a systematic check from dimensions to shape, from appearance to internal quality. Only by strictly controlling the above six points can we prevent unqualified materials from entering the workshop from the very beginning, laying a reliable foundation for subsequent assembly, welding, and installation. It is recommended to record and archive every acceptance data, forming a traceable quality record for continuous improvement and accountability management.

For more information needed or any inquiry,please feel free to contact Yumisteel team.