GAOERJI STEEL
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Provide structural steel conforming to GB Q235B/Q355B, EN S235/S275/S355, GOST St37/St52, ASTM A36/A572 standard with yield strength of 345MPa, support large-span column-free design, shorten the construction period by 20%-30% compared with traditional concrete construction, and provide high-strength and lightweight skeleton support for multi-family residential buildings with large-scale supply capacity.
GB Q235/355
Material standard
≥ 345 MPa
Yield strength
>4 mm
Machining tolerance
Using factory prefabricated production, site installation speed is 25%-30% faster than cast-in-place concrete structure. This “plug and play” installation method significantly reduces the financing costs and on-site labor requirements of multi-family residential projects.
Utilizing a high yield strength of 50ksi(345MPa), a long span shallow beam design over 9 meters is supported. Reduce the number of load-bearing columns inside multi-family houses, increase usable floor area and optimize heating, ventilation and air conditioning (HVAC) piping layout.
The whole process adopts numerical control cutting and drilling, and the tolerance of component length and hole position is strictly controlled within 1mm. High-precision manufacturing eliminates on-site installation misalignment problems and ensures the tightness of bolt connections and the stability of the overall structure.
The self-weight of structural steel systems is usually 40%-50% lighter than that of reinforced concrete buildings. This feature significantly reduces the cost of foundation treatment for multi-family houses, while reducing seismic loads and improving the safety of buildings in earthquake zones.
As an inorganic non-combustible material, structural steel does not support combustion. With the expansion of fire retardant coating or fire board package, the fire resistance limit can easily reach 2-3 hours, fully meet the strict fire safety specifications of multi-storey and high-rise residential buildings.
It is mainly produced by the electric arc furnace process and contains more than 93% recycled materials. 100 percent recyclable at end-of-life, helping multi-family residential developments earn LEED green building certification points.
| Parameter name | Specifications/Standard Data |
| Main profile standards | ASTM A992, A572, A572 Grade 50/60/65, A992 ;EN 10025; GB/T 1591 |
| Yield strength | 50 ksi (345 MPa) |
| Tensile strength | 65 ksi (450 MPa) |
| elastic modulus | 29,000 ksi (200 GPa) |
| density | 7.85 g/cm³ |
| Manufacturing tolerance standards | AISC 303, ASTM A6 |
| Surface treatment | Shot blasting to remove rust at Sa 2.5 grade, pre-coated with epoxy zinc-rich primer. |
| Common connection methods | High-strength bolt connection (A325/A490), welding |
| Fire protection compatibility | Fire-retardant spray, intumescent coating, gypsum board wrapping |
| Recycled material content | > 90% (mainly recycled scrap steel) |
Developers seeking a fast return on investment (ROI). Using the rapid construction characteristics of structural steel, multi-family residential projects can be delivered to the market months in advance, thereby greatly saving financing interest and speeding up the return of funds.
Contractors facing tight deadlines and restricted construction sites. Off-site prefabrication and just-in-time (JIT) delivery of structural steel reduces the need for on-site material stacking, reduces construction noise and dust interference, and facilitates project management in urban centers.
Businesses that focus on prefabricated multi-family homes. The high-precision tolerance and high-strength-to-weight ratio of structural steel make it an ideal material for modular unit frames, capable of withstanding dynamic loads during transportation and lifting.
Designers who need flexible space layouts. Through the large span capacity of the steel structure, an open floor plan is designed to allow residents to freely customize space in non-load-bearing wall areas, enhancing the market appeal of the property.
Provide Tekla 3D in-depth design and structural optimization suggestions before sales; provide complete component installation instructions, on-site technical support, and a 2-year quality assurance service for welds and coatings after sales.
With proper anti-corrosion maintenance and fire protection, structural steel frames used in multi-family houses can have an expected service life of more than 75-100 years. It is recommended to check the anti-rust layer of hidden parts every 5-10 years.
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Provide structural steel conforming to GB Q235B/Q355B, EN S235/S275/S355, GOST St37/St52, ASTM A36/A572 standard with yield strength of 345MPa, support large-span column-free design, shorten the construction period by 20%-30% compared with traditional concrete construction, and provide high-strength and lightweight skeleton support for multi-family residential buildings with large-scale supply capacity.
Material standard
GB Q235/355
Yield strength
≥ 345 MPa
Machining tolerance
>4 mm
Using factory prefabricated production, site installation speed is 25%-30% faster than cast-in-place concrete structure. This “plug and play” installation method significantly reduces the financing costs and on-site labor requirements of multi-family residential projects.
Utilizing a high yield strength of 50ksi(345MPa), a long span shallow beam design over 9 meters is supported. Reduce the number of load-bearing columns inside multi-family houses, increase usable floor area and optimize heating, ventilation and air conditioning (HVAC) piping layout.
The whole process adopts numerical control cutting and drilling, and the tolerance of component length and hole position is strictly controlled within 1mm. High-precision manufacturing eliminates on-site installation misalignment problems and ensures the tightness of bolt connections and the stability of the overall structure.
The self-weight of structural steel systems is usually 40%-50% lighter than that of reinforced concrete buildings. This feature significantly reduces the cost of foundation treatment for multi-family houses, while reducing seismic loads and improving the safety of buildings in earthquake zones.
As an inorganic non-combustible material, structural steel does not support combustion. With the expansion of fire retardant coating or fire board package, the fire resistance limit can easily reach 2-3 hours, fully meet the strict fire safety specifications of multi-storey and high-rise residential buildings.
It is mainly produced by the electric arc furnace process and contains more than 93% recycled materials. 100 percent recyclable at end-of-life, helping multi-family residential developments earn LEED green building certification points.
| Parameter name | Specifications/Standard Data |
| Main profile standards | ASTM A992, A572, A572 Grade 50/60/65, A992 ;EN 10025; GB/T 1591 |
| Yield strength | 50 ksi (345 MPa) |
| Tensile strength | 65 ksi (450 MPa) |
| elastic modulus | 29,000 ksi (200 GPa) |
| density | 7.85 g/cm³ |
| Manufacturing tolerance standards | AISC 303, ASTM A6 |
| Surface treatment | Shot blasting to remove rust at Sa 2.5 grade, pre-coated with epoxy zinc-rich primer. |
| Common connection methods | High-strength bolt connection (A325/A490), welding |
| Fire protection compatibility | Fire-retardant spray, intumescent coating, gypsum board wrapping |
| Recycled material content | > 90% (mainly recycled scrap steel) |
Developers seeking a fast return on investment (ROI). Using the rapid construction characteristics of structural steel, multi-family residential projects can be delivered to the market months in advance, thereby greatly saving financing interest and speeding up the return of funds.
Contractors facing tight deadlines and restricted construction sites. Off-site prefabrication and just-in-time (JIT) delivery of structural steel reduces the need for on-site material stacking, reduces construction noise and dust interference, and facilitates project management in urban centers.
Businesses that focus on prefabricated multi-family homes. The high-precision tolerance and high-strength-to-weight ratio of structural steel make it an ideal material for modular unit frames, capable of withstanding dynamic loads during transportation and lifting.
Designers who need flexible space layouts. Through the large span capacity of the steel structure, an open floor plan is designed to allow residents to freely customize space in non-load-bearing wall areas, enhancing the market appeal of the property.
Provide Tekla 3D in-depth design and structural optimization suggestions before sales; provide complete component installation instructions, on-site technical support, and a 2-year quality assurance service for welds and coatings after sales.
With proper anti-corrosion maintenance and fire protection, structural steel frames used in multi-family houses can have an expected service life of more than 75-100 years. It is recommended to check the anti-rust layer of hidden parts every 5-10 years.