GB Q355B Low Alloy High Strength Hot Rolled H-Beam Steel In Steel Structural gets its name because of its cross-sectional shape resembling the letter ‘H’. It possesses excellent mechanical properties and high load-bearing capacity.
“Q” is the initial letter of the pinyin for “yield” in Chinese.
“355” represents that when the thickness of the steel is less than or equal to 16 millimeters, the lower limit value of its yield strength is 355 megapascals.
“B” indicates the quality grade of the steel, and the impact test is conducted at an environmental temperature of -20℃.
“H” indicates that the production state of the steel is hot-rolled.
The yield strength of Q355B is higher and its resistance to deformation is stronger. Under the same load, a smaller cross-section of the profile can be selected, and the long-term operational stability is also better. The H-shaped steel has an H-shaped cross-section, with wide flanges and thin webs. Its bending resistance is improved by 5% to 10% compared to I-beams, and the connection processing is more convenient, which can save about 30% of the manufacturing cost.
(H-Beam Section Dimension Explanation)
The cross-sectional dimensions of H-shaped steel are usually expressed as H × B × t₁ × t₂ × L:
Example: H 400×200×8×13×12m
Translation:
Expression:
Q355B is a high-strength low-alloy structural steel in accordance with China’s GB/T 1591 standard. In China, it is called: Q355B H-beam. The corresponding foreign brand name is:
Europe: EN 10025-2: S355JR
USA: ASTM: A572 Grade 50
Japan: JIS G3106: SM490A / SM490B
Germany: Old DIN standard: St52-3
UK: BS 4360: 50B
Australia: AS/NZS 3678: Grade 350
What are the specific requirements for the chemical composition of Q355BH steel?
(C)：≤0.24%
(Si)：≤0.55%
(Mn)：≤1.60%
(P)：≤0.035%
(S)：≤0.035%
(Cr)≤0.30%、
(Ni)≤0.30%、
(Cu)≤0.40%、
(N)≤0.012%
Micro-alloying elements: These elements such as Nb, V, and Ti can be added according to the process.
| Chinese | English |
|---|---|
| Q355B H型钢 | Q355B H Beam |
| 高强度H型钢 | High Strength H Beam |
| 热轧H型钢 | Hot Rolled H Section Steel |
| 结构钢H型材 | Structural Steel H Section |
Custom GB Q355B H Beam Core mechanical performance indicators：
Yield strength (ReH): ≥ 355 MPa
Tensile strength (Rm): 470 ~ 630 MPa
Post-rupture elongation (A): ≥ 21% (for longitudinal specimens)
Impact toughness (KV2): ≥ 34 J at 20°C
Density: Approximately 7.85 g/cm³
What are the standards followed by the supplier of Q355B welded H beams?
GB/T 11263-2024
Common application scenarios of Q355B Steel series：
HW (Wide Flange) :
H ≈ B, such as HW200×200, HW300×300. It is specifically used for axial compression columns and frame columns. It has high lateral stiffness and good torsional performance.
HM (Medium Flange) :
H: B ≈ 1.5:1, such as HM300×150, HM400×200. Suitable for bending members (columns as beams) or medium-span beams, taking into account both axial and bending loads.
HN (narrow flange):
H: B ≥ 2:1, such as HN200×100, HN500×200. Specifically for flexural beams. It has a large moment of inertia about the strong axis, good economy, and is the preferred choice for beam components.
Specification marking:
Usually it is “height × width × web thickness × flange thickness” (such as HN400×200×8×13), and the length is mostly 6m/9m/12m fixed length or customized.
Q355B H Beam Steel Profile 300mm*150mm*6.5mm*9mm Current price reference (July 2026):
The overall market price range is approximately 3,300 – 4,500 yuan per ton, with variations depending on the region, specification, and processing method.
Q355 H Beam for Structural & Construction Projects Markup Rules:
1. For Q355C/Q355D low-temperature materials of the same specification, the price per ton will be increased by 100 – 260 yuan.
2. For the thickened non-standard flange and web specifications, the price per ton will be increased by 90 – 220 yuan.
3. For 6-meter and 9-meter short lengths, the price per ton will be reduced by 60 yuan. For 15-meter and 18-meter extended standard lengths, the price per ton will be increased by 80 yuan.
Q355B Anti-corrosion Treatment:
Q355B high frequency welded H beam does not have weather resistance and requires painting or hot-dip galvanizing for rust prevention.
In which fields is Q355B H Beam applied?
Steel Column/Frame Beam/Floor support structure/Constructing highway bridges / Main girder of the bridge/Support structure/Steel box girder connection structure/Equipment base/Crane support/Mining equipment frame/Conveyor system support/Steel structure main body/Large-span roof truss/Shelf support/Wind power infrastructure/Power plant steel structure/Petrochemical platform/Pipeline gantry support/box girders / bridge piers / ancillary steel structures / large public buildings / sports stadiums / exhibition centers / industrial plants / roof covers / trusses / columns / curtain wall supports / power transmission towers / communication signal towers / wind turbine towers / lighting towers / railway freight carriages / containers / port machinery / outdoor sculptures / art installations / highway crash barriers / sound insulation barriers / power transmission and transformation structures / large pipeline supports/Plant building columns/Roof beams/Crane beams/Steel structure platform
What Q355B H Section Steel Cross Beam In Modern Construction inspections need to be carried out upon leaving the factory?
1. Chemical composition inspection
2. Mechanical property test
3. Tensile test
4. Impact test
5. Bending test
6. Process performance test
7. Macro and micro examination
8. Microstructure examination
9. Non-metallic inclusions inspection
10. Dimension, shape and surface quality inspection
Q355b Hot Rolled H-Section Steel 200*200 400*400mm Steel Structural Beam and Column Structural Steel H-Beam, the original factory quality certificate (material list) and the factory inspection report, as well as the product certificate, must be provided upon delivery.
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