A36 Ss400 Q235 Q345b Construction Ms Angle Steel Bar 100X100X5 Hot Rolled Iron Angle Size Slotted Profile Steel

The A36, SS400, Q235, and Q345b construction MS (mild steel) angle steel bar, specified as 100X100X5mm hot-rolled slotted iron angle, is a high-performance structural steel profile engineered specifically for construction applications, integrating standardized dimensions, robust mechanical properties, and tailored slotted design to meet diverse on-site installation and load-bearing needs. As a core material in construction projects, this angle steel strictly complies with international (ASTM, JIS) and Chinese national standards, manufactured from high-purity mild steel billets via advanced hot-rolling technology, ensuring consistent quality, excellent processability, and reliable structural stability-making it a versatile and cost-effective choice for modern construction, infrastructure, and industrial framing.

This angle steel features a standard equal-sided L-shaped cross-section with precise dimensions of 100X100X5mm, where the two parallel legs (flanges) are each 100mm in length and 5mm in thickness, connected at a precise 90-degree right angle. The 5mm thickness strikes an optimal balance between weight and load-bearing capacity, providing sufficient structural rigidity to resist bending, torsion, and shear forces while maintaining moderate weight for convenient transportation, hoisting, and on-site assembly. A key distinguishing feature is its slotted design-precisely machined slots along the leg length are tailored to facilitate quick and secure connection with bolts, screws, or other fasteners, eliminating the need for on-site drilling, reducing installation time, and ensuring accurate alignment of structural components.

Manufactured through mature hot-rolling technology, the 100X100X5mm slotted iron angle undergoes a strict thermal processing procedure: mild steel billets are heated to temperatures above the recrystallization point (800-1050℃) to soften the material, then passed through precision rolling mills to form the standard L-shape, followed by specialized slotting processing to ensure slot dimensional accuracy and surface smoothness. The hot-rolling process refines the internal grain structure of the steel, enhancing its ductility and toughness, while the post-rolling slotting is performed with high-precision equipment to avoid material deformation or structural damage-ensuring the slotted areas maintain the same mechanical performance as the rest of the angle bar.

The four core steel grades-A36, SS400, Q235, and Q345b-are all high-quality mild and low-alloy structural steels, each with well-defined chemical and mechanical properties to adapt to different construction load requirements and application scenarios, while maintaining excellent compatibility with the slotted design and hot-rolled processing.

ASTM A36, compliant with ASTM A36/A36M standards, is a general-purpose carbon structural steel with a minimum yield strength of 250MPa, tensile strength of 400-550MPa, and maximum carbon content of 0.25%. It boasts superior weldability and formability, making it suitable for general construction supports, frames, and brackets that require reliable load-bearing capacity.

SS400, adhering to JIS G 3101 standards, is a Japanese industrial general-purpose carbon steel with a minimum yield strength of 245MPa and tensile strength of 400-510MPa. It features flexible chemical composition control, excellent ductility, and cost-efficiency, widely used in global construction projects as an interchangeable alternative to mild steel grades for framing and support components.

Q235, following Chinese GB/T 700 standards, is a classic mild carbon steel with a minimum yield strength of 235MPa and tensile strength of 375-500MPa. It is characterized by good toughness, easy processability, and low cost, serving as a staple material for light to medium-duty construction components such as purlins, girts, and slotted support brackets.

Q345b (equivalent to Q355b in updated standards), compliant with GB/T 1591, is a low-alloy high-strength steel with a minimum yield strength of 345MPa and tensile strength of 470-630MPa. The "b" grade indicates it meets impact toughness requirements at 20℃, offering higher strength than mild steel grades, making it ideal for heavy-duty construction supports, load-bearing frames, and infrastructure reinforcement where enhanced structural stability is required.

All grades of this slotted hot-rolled angle steel have strictly controlled harmful impurities (phosphorus ≤0.045%, sulfur ≤0.045%), effectively preventing material brittleness and ensuring long-term durability in harsh construction environments, including outdoor, humid, and industrial settings. The mild steel (MS) base material exhibits good corrosion resistance in normal atmospheric conditions, and can be further enhanced with galvanization, painting, or other anti-corrosion treatments to extend service life in corrosive environments.

In construction applications, the 100X100X5mm slotted angle steel is widely used in framing systems, column supports, beam brackets, scaffolding accessories, piping supports, and prefabricated structural components. Its slotted design enables flexible and efficient installation, while the diverse steel grade options allow for tailored selection based on project load requirements-balancing performance and cost-efficiency. With standardized dimensions, reliable mechanical properties, and user-friendly slotted design, this A36 SS400 Q235 Q345b construction MS angle steel bar provides a practical and reliable structural solution for modern construction projects worldwide.