Design |
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1. Design Code |
TIA/EIA-222-G/F |
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Structure Steel |
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2. Grade |
Mild Steel |
High Tensile Steel |
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GB/T 700:Q235B, Q235C,Q235D |
GB/T1591:Q345B, Q345C,Q3455D |
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ASTM A36 |
ASTM A572 Gr50 |
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EN10025: S235JR, S235J0,S235J2 |
EN10025: S355JR, S355J0,S355J |
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3. Design Wind Speed |
Up to 250 km/h |
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4. Allowable deflection |
0.5 ~1.0 degree @ operational speed |
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5. Tension strength (Mpa) |
360~510 |
470~630 |
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6. Yield strength (t≤16mm) (Mpa) |
355 |
235 |
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7. Elongation (%) |
20 |
24 |
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8. Impact strength KV (J) |
27(20°C)---Q235B(S235JR) |
27(20°C)---Q345B(S355JR) |
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27(0°C)---Q235C(S235J0) |
27(0°C)---Q345C(S355J0) |
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27(-20°C)---Q235D(S235J2) |
27(-20°C)---Q345D(S355J2 |
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Bolts & Nuts |
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9. Grade |
Grade 4.8, 6.8, 8.8 |
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10. Standards for mechanical properties |
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10.1 Bolts |
ISO 898-1 |
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10.2 Nuts |
ISO 898-2 |
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10.3 Washers |
ISO 6507-1 |
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11. Standards for Dimensions |
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11.1 Bolts |
DIN7990, DIN931, DIN933 |
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11.2 Nuts |
ISO4032, ISO4034 |
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11.3 Washers |
DIN7989, DIN127B, ISO7091 |
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Welding |
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12. Method |
CO2 Shielded Arc Welding & Submerged Arc Welding(SAW) |
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13. Standard |
AWS D1.1 |
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Marking |
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14. Method of marking of the members |
Hydraulic Press Stamping |
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Galvanizing |
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15. Galvanization standard of steel sections |
ISO 1461 or ASTM A123 |
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16. Galvanization standard of bolts and nuts |
ISO 1461 or ASTM A153 |
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Test |
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17. Factory test |
Tensile test,Elements analysis, Sharpy test(impact test), Cold Bending, Preece test,Hammer test |
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