The I-Beam, named for its "I"-shaped cross-section, is a fundamental structural steel product widely used in construction, bridges, industrial plants, and machinery. This description covers standard hot-rolled I-beams produced by Maanshan Steel (MAGANG), Laiwu Steel (LAIGANG), and Jinxi Iron & Steel (JINXIGANG)-three major Chinese manufacturers-known for high strength, excellent bending resistance, and dimensional accuracy.
Main Manufacturers & Product Features
| Manufacturer | Key Features |
| Maanshan Iron & Steel Co., Ltd. | One of China's earliest I-beam producers; high dimensional precision and surface quality; used in national key projects. |
| Shandong Iron & Steel Group (Laiwu) | Major supplier in North China; complete product range; cost-effective for civil and industrial construction. |
| Jinxi Iron & Steel Group Co., Ltd. | Renowned for H-beams; also capable of producing large I-beams; wide size range; strong export capacity. |
Applicable Standards:
GB/T 706-2016 "Hot-Rolled Section Steel" – Chinese national standard for dimensions, tolerances, and mechanical properties.
Optional standards: JIS G3192 (Japan), ASTM A6/A6M (USA), EN 10024/10034 (Europe) upon customer request.
Materials (Grades):
Q235A/B/C/D: General carbon structural steel for common construction applications (produced by all three).
Q355A/B/C/D/E: Low-alloy high-strength steel with improved mechanical and low-temperature toughness (mainstream for heavy-duty use).
SM490A/B: Japanese standard high-strength steel (available on order from MAGANG & JINXIGANG).
S235JR, S355JR: European grades for international projects.
Applications:
Building Construction: Columns, beams, and frames in industrial workshops.
Bridge Engineering: Main girders and supports for medium/small-span bridges.
Mechanical Equipment: Machine frames, crane rails, conveyor supports.
Transportation: Rail vehicle chassis, station platforms.
Energy & Power: Substation structures, wind tower supports, pipe rack foundations.
Mining & Ports: Mine supports, port handling equipment.
Key Advantages:
High Strength & Bending Resistance: Optimized cross-section for vertical load-bearing.
Consistent Quality: Modern continuous rolling lines ensure precision and reliability.
Strong Supply Capacity: High annual output from all three mills supports large-scale projects.
Wide Size Range: Standard and custom options available.
Certified & Proven: Approved by CCS, ISO 9001; used in major projects like high-speed rail and airports.
Surface & Delivery Conditions:
Surface: As-rolled (black), optional sandblasting (Sa2.5) or anti-corrosion coating (e.g., epoxy primer).
Length: Standard 6m, 9m, 12m; cut-to-length available.
Condition: As-rolled; normalized or controlled rolling available upon request (e.g., for Q355D low-temperature impact).
Hot Tags: steel i beam header, China steel i beam header manufacturers, suppliers, factory, Stainless H Beam, Bulb Flat Steel, C Purlin And Z Purlin, stainless steel h section, Hot Rolled Equal Angle, Hot-Rolled Flat Steel
