welded H-beam

What Are the Differences between Hot Rolled H-Beam Steel and Welded H-beam Steel?

Hot-rolled H-shaped steel is a new type of economical construction steel. Its web (often called the waist) is perpendicular to the two flanges (often called the legs). The cross-section is shaped like the English letter “H”, so it is called H-beam steel. And because the inner and outer sides of the flange are parallel to each other, the leg ends are straight and have sharp edges, it is also called “parallel leg I-beam”.

Compared with the traditional I-beam steel, the section resistance moment of welded H-beam steel is larger, and the mechanical properties are stronger, so it is very suitable for the construction of steel structures. In terms of load-bearing capacity, welded H-beam steel can steadily play its good bearing capacity, and it saves 10%-15% of materials than traditional I-beam steel; Moreover, the welded H-beam steel will not be restricted by the mold size during manufacturing, and can flexibly produce a variety of changing specifications, and the size is very accurate, and some requirements for strange designs can also be achieved without missing.

There are some differences in characteristics between hot-rolled H-shaped steel and welded H-beam steel:

Hot rolled H-shaped steel

1.Wide range of specifications

The height, web, flange width, and flange thickness can be selected and welded according to customer requirements. In addition to standard sizes, various non-standard sizes can also be made as needed.

2. Choose from a variety of steel types

Hot-rolled H-beams are mainly Q235B and Q354B. If a small batch of special steel is needed, the manufacturer may not be able to meet the demand. However, for welded H-beams, steel plates can be selected as needed.

3. High product precision and good surface quality

Since the steel plate product has high precision and good surface quality, the welded H-beam steel has high precision and good surface quality, which makes the hot-rolled H-shaped steel smoother and more beautiful in appearance.

4. Stable performance and good internal organization

Since the smelting, continuous casting, and rolling process requirements of hot-rolled H-beam steel are high, and the equipment capabilities, control levels, and detection methods are high, its internal structure, chemical composition, and various performance (mechanical properties, process performance, etc.) indicators are all reliable and stable.

Welded H-beam

1.Wide range of specifications

Similar to hot-rolled H-beam steel, the cross-sectional size of welded H-beam steel can also be selected and produced according to customer requirements to accommodate various non-standard sizes.

2. Lower loss

Compared with hot-rolled H-beam steel, welding H-beam steel requires less work and material, which can better reduce the loss of raw materials and energy.

3. Outstanding product features

Welded H-shaped steel has the advantages of good pressure resistance and high load-bearing capacity, but its product performance uniformity is difficult to guarantee, and its size specifications are subject to certain restrictions.

4. Welding defects are prone to exist

Although welding H-shaped steel has many advantages, due to the characteristics of welding formation, welding residual thermal stress exists in the welding area. The structure of the welding area is different, and there is organizational stress, which is prone to welding defects.

There are differences between hot-rolled H-beam steel and welded H-shaped steel in the following aspects:

1. Processing technology

Hot-rolled H-beams are formed by rolling mills, while welded H-beams are formed by welding the sides and waist in a continuous welding set.

2. Consumption of raw materials and wages

Hot-rolled H-beams use fewer raw materials, which can better reduce energy and labor losses, while welded H-beams consume more labor.

3. Product features

The product performance uniformity of welded H-shaped steel is not easy to guarantee, the size specifications are limited, but it has the advantages of good pressure resistance and high load bearing. Hot-rolled H-beam steel has high structural stability and is suitable for building construction in the first earthquake zone.

4. Specification and selection of steel

The specifications (section size) of welded H-beam steel have a wide range, and the steel plate can be selected for welding according to customer requirements, and the steel grades can be selected are more diverse. The specifications of hot-rolled H-beam steel are relatively fixed, and the choice of steel is relatively limited.

5. Product accuracy and internal organization

The product precision of welding H-shaped steel is high and the surface quality is good, which is because the steel plate used for welding is of high precision and good surface quality, so the H-beam steel after welding is also of high precision and good surface quality. In addition, due to the smelting, continuous casting, rolling and other process requirements, equipment capacity, control level, detection means are high, so its internal organization and chemical composition, various properties (mechanical properties, process properties, etc.) indicators are reliable and stable.

In summary, there are obvious differences between hot-rolled H-beam and welded H-beam in processing technology, raw material and quantity consumption, product characteristics, specifications and steel selection, product accuracy and internal organization. The specific type of H-beam steel should be selected according to the specific application scenarios and needs.