There are two main types of steel plate: Q235 and Q355.
Q means "bend", it is for the yield strength.
Q235 is the minimum yield strength 235 Mpa.
Q355 is the minimum yield strength 355 Mpa.
Q235 and Q345 as the popular construction steel materials
They are divided into 4 grades, ABCD. Such as Q235A , Q235B, Q235C, Q235D.
ABCD refers to the impact test grade. A means that it has not been impact tested. B means that it has been impact tested at 20 ° C temperature. C means that it has been impact tested at 0 ° C temperature. And D means that it has been impact tested at low temperature of -20 ° C.
Q235A&Q235B, Q345A&Q345B are the most popular.
Q345 is mainly used for main steel frame. Like column, beam, wind speed resistant column, crane girder...
Q235 is mainly used for secondary steel frame. Like tie bar, brace, vertical/horizontal support...
The choice of material can be according to the design of the structure of your specific circumstances. For example, if the structure is intensity control structure, Q345 can be considered. If the structure is stiffness control structure, you can choose Q235. The price Q345 is a little higher, but because of its high strength, the material can be saved. And the price difference is not great.
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Main steel Frame |
Materials |
Q355b (equivalent to S355JR, ASTM A572 Gr. 50) Q235b (equivalent to S235JR, ASTM A36) |
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H section steel |
steel plate thickness: 8-30mm |
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Welding |
Automatic submerged arc welding |
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Rust removal |
Sand blasting |
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Surface finish |
Alkyd / Epoxy zinc paint / hot dipping galvanized |
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Connection |
By High strength bolts, Grade 10.9, Grade 8.8 |
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Secondary steel frame |
Angle steel brace |
L steel, Q235b, painted / hot dipping galvanized |
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Horizontal brace |
Steel bar, Q235b, painted / hot-dip galvanized |
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Column brace |
Steel bar, Q235b, painted / hot-dip galvanized |
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Tie beam |
CHS, Q235b, painted / hot dipping galvanized |
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Connection |
By ordinary bolts, Grade 4.8 |
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Roof System |
Purlin |
C/Z purlin, Q235b, pre-galvanized 100g-275g |
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Roof panel |
Insulated sandwich panel or Corrugated steel sheet |
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Edge cover |
steel sheet trimming |
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Gutter |
Stainless steel / Galvanized sheet |
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Down pipe |
Φ110 PVC-U, Φ150 PVC-U |
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Fix Accessories |
sealing, self-tapping screws, etc. |
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Wall System |
Purlin |
C/Z purlin, Q235b, pre-galvanized 100g-275g |
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Wall |
Insulated sandwich panel or corrugated steel sheet |
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Accessories |
sealing, self-tapping screws, etc. |
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Edge cover |
steel sheet trimming |
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Fix Accessories |
sealing, self-tapping screws, etc. |
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Door and window |
Different sizes and types are possible to custom. |
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Additional options |
Skylight panel; Roof ventilator; Parapet; Glass curtain wall; Decorative aluminum panel |
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Tell us |
Offer our customized solution & budget |
Confirm and start |
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Share your project requirements, drawings or ideas as detailed as possible |
Our team will develop the best solution based on your specifications and provide an budget for you. |
After your approval,we'll start detailed drawing for production and manage every aspect of delivery and installation. |
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