The China Zinc Aluminum Magnesium Omega Profile supplied by Shixinda has undergone structural and mechanical strength tests, which show that the cross-section of the several characters has outstanding bending stiffness. Under the same steel usage, it has better load-bearing capacity than angle steel and channel steel. The 500MPa high-strength base material can be reduced by 30% to 40% in steel usage. The rib structure enhances the lateral stability resistance, and the top slope surface simulates rainwater drainage smoothly, reducing dust accumulation and water accumulation. The coating at the bolt assembly test holes is not prone to damage.
1. Superb Corrosion Resistance: Shixinda's zinc aluminum magnesium coating has a corrosion resistance 5-20 times that of ordinary hot-dip galvanized steel, and can withstand salt spray for 5000-9000 hours; in C5-level coastal, saline-alkali, and other highly corrosive environments, the service life is 25-30 years.
2. Self-Repairing Cut Surface, Eliminating Rust at Cut Ends: After cutting or scratching the steel, a dense composite passivation film is automatically generated at the cross-section, preventing rust from spreading inward, achieving self-sealing repair of the cut surface and solving the problem of rusting at cut ends in traditional galvanized steel.
3. High Coating Hardness, Wear Resistance and Scratch Resistance: The coating hardness is 2-3 times that of pure zinc coating, and the friction coefficient is reduced by approximately 15%; during processing, hoisting, and installation, it is less likely to be scratched or damaged.
4. Good Processing Compatibility: Excellent adhesion during cold bending, stamping, welding, and coating, with excellent forming efficiency improvement of about 30%, and the coating is less likely to fall off, meeting the requirements for various complex cross-sectional roll-forming production.
1. High Bending Bearing Capacity, Cost Savings: Shixinda's "several-character" section structure enhances the section's moment of inertia and bending stiffness. Under the same steel usage, its bearing capacity is superior to angle steel and channel steel, enabling larger-span designs.
2. Self-Drainage, Less Accumulation of Dust and Water: The top "several-character" shape forms a natural drainage slope, preventing water accumulation and dust accumulation, suitable for roof trusses, greenhouse frame, and other scenarios.
3. Strong Structural Stability: The rib-shaped structure strengthens the overall stiffness, effectively transferring horizontal loads, avoiding lateral instability of the roof truss, and can be combined with C/Z steel to form a complete supporting system.
4. Light Self-Weight, Convenient Construction: Cold-bent thin-walled profiles have a light self-weight, quick assembly with bolt connections, support for fixed-length custom cutting, reducing on-site labor and construction costs.
1. Lower total life cycle cost. Compared to ordinary galvanized steel, the initial investment is slightly higher, but it can achieve maintenance-free for 25-30 years, and the overall cost performance is outstanding in the long term.
2. Widely adaptable to harsh environments. It can be used in coastal areas, desert sand, saline-alkali land, and humid and hot agricultural environments. It has strong resistance to salt and sand.
3. Lightweight components. The yield strength of the base material can reach above 500 MPa. Under the same load-bearing conditions, the steel usage can be reduced by 30% - 40%.
4. Green building material attribute. The coating magnesium element accelerates the formation of the passive film, reduces zinc consumption, and conforms to the development direction of green building materials.
1. Plane Neutral Salt Spray Test: Shixinda zinc-aluminum-magnesium type steel, single-sided coating of 90-120 g/m², neutral salt spray lasts for 5000-9000 hours before the first batch of red rust appears; ordinary hot-dip galvanizing (Z275) usually only shows red rust after 300-600 hours, and its corrosion resistance is 5-20 times that of ordinary hot-dip galvanizing. Simulated C5 coastal high-corrosion cycle salt spray test, the sample can stably correspond to the 25-30 years engineering design life.
2. Self-Repairing Corrosion Test of Notches (Core Differentiation Test) The sample is made with a cutting notch without edge sealing treatment, simulating the real working condition of on-site cutting processing.
Salt Spray 1000 hours: The notch forms a gray-white dense passivation protective film, the width of the red rust expansion at the notch is ≤ 0.5-1.2 mm; under the same conditions, the red rust expansion at the cutting notch of ordinary hot-dip galvanizing is ≥ 4.8 mm, and the rust spreads quickly towards the base material.
Dry-Wet Cycle Corrosion Test: The notch position continuously forms a film by the migration of zinc, aluminum, and magnesium ions, and no large-scale red rust crawling occurs; traditional galvanizing cutting notches quickly expose large areas of red rust. China Steel Industry... 。
Outdoor seaside exposure simulation: 6 months in marine environment, the cut surface only forms a white rust protective layer, with no obvious red rust; the ordinary galvanized cut surface is severely rusted and peels off.
3. Hardness and wear resistance test of the coating: The measured Vickers hardness of the zinc-aluminum-magnesium coating is 2-3 times that of the ordinary pure zinc coating; the friction coefficient decreases by approximately 15%. After repeated friction and scraping, the coating is not prone to peeling or flaking; compared with ordinary galvanization, for the same external force scratch, the damage range of zinc-aluminum-magnesium is smaller.
4. Post-galvanizing Omega Profile processing after coating attachment test (bending, stamping) 180° T bending cold bending test, the coating allows for slight whitening, without coating peeling or large-scale crack detachment. Salt spray tracking test after rolling, stamping, and welding of the sample: The heat affected zone of welding still has certain anti-corrosion ability, and the forming efficiency is approximately 30% higher than that of ordinary galvanization.
1. Simply-supported bending load-bearing test: Under the same steel usage and plate thickness conditions, the moment of inertia and bending stiffness of several steel sections are superior to those of steel angles and channel sections of the same weight. Loading test: Under the same load, the deflection at the mid-span of several steel sections is smaller, enabling a larger purlin span; for 500MPa grade base materials, under the same load-bearing conditions, the steel thickness can be reduced by 30-40% to achieve lightweight.
2. Lateral instability and horizontal load simulation test: With ribbed reinforcement on the several cross-sections, horizontal lateral force loading, the lateral instability resistance of several steel sections is superior to that of ordinary C-shaped steel; when loading in a combined system with C/Z-shaped steel, the deformation of the overall structure meets the design specifications for steel roof trusses.
3. Simulation of rainwater drainage and dust accumulation for rain test: Rainwater drainage and dust accumulation simulation test: On the top slope of the several sections, the water flows quickly to both sides, and the water accumulation stays for a short time. Compared with the inner concave groove of C-shaped steel, there is less dust accumulation and water accumulation, reducing the local corrosion risk caused by water accumulation.
4. Bolt connection assembly test: Repeated disassembly and assembly test of bolts, the coating around the hole position is not prone to cracking; supports fixed-length cutting, and the cutting edge still retains the self-repairing ability after on-site assembly.
1. Yield strength measurement: ≥ 500 MPa, tensile strength ≥ 530 MPa, elongation after fracture meets the requirements of cold-formed profiles.
2. Bending test: 180° cold bending, the material shows no cracks and the coating shows no peeling.
3. Coating weight testing: The weight of the double-sided coating can be controlled within the range of 140 - 240 g/m² according to customer requirements.
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