Q345 Onstruction Steel I Beam
Length: 1-12m
Material: Q345B Q235B Q420C etc
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Q345 Onstruction Steel I Beam |
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H-Shape steel |
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Cold Rolled.hot Rolled |
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1.Web Width (H): 80-900mm |
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1m - 12m , or according to your requests. |
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Q235B Q345B Q420C Q460C SS400 SS540 S235JR S275JR S355JR A36 A572 A992 G50 or others as buyers' requests. |
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Smooth/Black/Galvanized/Oiled/Color-coated or as required |
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ISO9001 |
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219 - 2020 mm, 219mm--2020mm |
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±1% |
Q: What is Q345 material?
A: Q345 is Chinese low alloy high strength structural steel conforming to GB/T 1591. "Q" means yield strength; 345 stands for its minimum yield strength 345MPa (plate <=16mm). Alloyed with manganese, it has good toughness and weldability. Even though Q355 replaces it in the new standard, Q345 remains widely used globally for steel plates, H beams, pipes, bridges and heavy machinery.
Q: What is the difference between Q235 and Q345?
A: Q235 is common carbon structural steel with 235MPa yield strength, low cost for light-load components. Q345 is low alloy high strength steel with 345MPa yield strength. With higher manganese content, Q345 bears heavier loads. Q235 suits simple brackets and housings; Q345 applies to load-bearing structures, bridges and engineering equipment. Thick Q345 needs attention on welding preheating.
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