Steel H&I beam tolerance after rolling
Rolled steel beams are widely used in various occasions, such as structural functionality or aesthetics, circular shell stiffeners on ships and monorail or roof truss. The steel beam can roll vertically (weak axis) or horizontally (strong axis). When rolling a steel beam, it is important to consider the deformation.
Deformation is any degree that usually deviates from the original cross-sectional shape to some degree in each curved member. Consider rolling a straight line-the rolling process will deform the original shape into a curved shape. The possibility of deformation depends on several factors, including bending radius, material thickness, beam size, bending axis, bending method, and initial material geometric defects of the rolling mill.
When the steel beam undergoes a rolling process, its strain exceeds its yield point, which usually results in a certain degree of cross-sectional deformation. This process will produce inelastic compressive stress in the steel, which will cause deformation of the cross section of the rolled steel beam. Deformation is the product of local contact forces, where the machine's rollers are in contact with the steel beam.
When rolling steel beams in a hard way or on a strong shaft, inspections must be completed before and after rolling to ensure quality. This includes checking whether straight beams are suitable for AISC mill tolerances. Use the frame square to check the beam to ensure that the flange is perpendicular to the web. Place the beam flange on the horizontal floor and check the gap between the flange and the floor. The gap means sweeping out from the mill.
On very critical radius parts, the internal rolling radius must be maintained and suitable for scribing. The rolling radius tolerance should be specified by the customer (for example, +/- 1/8 "of the scribe). The minimum length tolerance of the rolled section should be measured along the outer radius surface using the theoretical outer arc. The rolled part must allow at least 4 inches of extra The length is used for manufacturing or on-site trimming. The sweep tolerance is usually specified by the customer (for example, 1/8 inch on a 36-inch section). The flange beyond the square tolerance should also be specified by the customer (for example, + 1/8 / -0 inches).
Here is a quick overview of tolerance checks on a hard way rolled beam:
Radius tolerance (+/-)
Minimum length, outside arc (+)
Sweep tolerance with 36” template (+/-)
Max out-of-square (+1/8)
Flange Offset (+/-)
Flange Warpage & Tilt (+/-)