The 1-1-3 rolling mill layout with 2 BD mill and UR-E-UR tandem mill and large door-type straightener apply to Masteel jumbo hot-rolled H-beam production line. Advanced process and technology such as near-net-shape beam blank continuous casting technology, micro tension control technology of tandem universal rolling mills and QST technology is applied to the line.
The key technology and equipment in which adopts automatic computer control system is introduced from foreign. The line with advanced level in contemporary international has design annual production capacity of 80,0000 tons.
Comparison of flange thickness between production from different lines
Comparison of microstructure in the inside filleted area between welded H-beam and hot-rolled H-beam
| Comparison Item | Hot-rolled H-beam | Welded H-beam |
|---|---|---|
| Forming Method | Hot rolling, plastic deformation | Formed by welding web and flange plates |
| Thermal Cycle | Uniform heating, controlled cooling | Local high temperature, fast cooling |
| Grain Morphology | Grains elongated along rolling direction, uniform size (5-10μm) | Coarse grains in HAZ (up to 20μm+), non-uniform structure |
| Phase Composition | Ferrite + pearlite, possibly with minor bainite | Quenched structures like widmanstätten or martensite may appear |
| Defects & Precipitates | Uniform precipitates, no welding defects | Possible micro-cracks, inclusions, element segregation |
| Strength & Toughness | Uniform distribution of strength and toughness | Higher strength but lower toughness in HAZ, prone to brittleness |
| Fatigue Performance | Low stress concentration, long fatigue life | High residual stress, prone to fatigue cracks |
| Application Scenarios | Bridges, high-rise buildings requiring stable performance | Customized structures like heavy machinery frames, often needing post-weld treatment |
Our production line can also produce Hot-rolled figured steel.
With over 18 years of experience, GNEE has a deep understanding of the ever-changing dynamics of the steel market, enabling us to make informed decisions and provide strategic guidance to our clients. We are committed to delivering the highest quality steel products. Our stringent quality control measures ensure that every product that leaves our factory meets the strictest international standards.
Please contact us: beam@gneesteel.com
