ASTM S235jr S275jr A572 Gr50 Gr60 A36 Ss400 Standard Unequal Equal Carbon Angle Steel

ASTM S235jr, S275jr, A572 Gr50, Gr60, A36, and SS400 standard unequal and equal carbon angle steel is a series of high-performance structural steel profiles, engineered to meet diverse load-bearing and framing needs across industrial, construction, and infrastructure projects worldwide. Compliant with strict international standards-including ASTM (American Society for Testing and Materials), EN (European Norm), and JIS (Japanese Industrial Standard)-this carbon angle steel is available in both equal-sided and unequal-sided L-shaped cross-sections, each optimized for specific structural scenarios. Manufactured from high-purity carbon steel billets via advanced hot-rolling technology, it delivers consistent quality, excellent mechanical properties, and superior processability, making it a versatile and reliable choice for structural support, framing, and reinforcement applications.

A key distinguishing feature of this product line is its dual configuration: equal and unequal carbon angle steel, each designed to address distinct force distribution requirements. Equal carbon angle steel features two identical-length legs (flanges) connected at a precise 90-degree right angle, ensuring symmetric load transmission and ease of assembly. It is ideal for applications requiring balanced structural support, such as light steel frames, roof purlins, wall girts, handrails, and general-purpose brackets. Unequal carbon angle steel, by contrast, has two legs of different lengths, optimized for asymmetric load-bearing scenarios-including beam brackets, column reinforcements, equipment bases, and bridge auxiliary structures-where one side requires enhanced support while the other minimizes material weight.

All variants of this carbon angle steel are produced using mature hot-rolling technology, a critical process that defines their mechanical integrity and dimensional precision. Carbon steel billets are heated to temperatures above the recrystallization point (typically 800-1050℃), softening the material while preserving its internal structural uniformity. The heated billets are then passed through precision rolling mills to form either equal or unequal L-shaped cross-sections, followed by natural cooling to room temperature. This process refines the internal grain structure, eliminates defects such as porosity and segregation, and results in a smooth surface finish, tight dimensional tolerances, and consistent thickness-ensuring compatibility with other structural components and facilitating on-site processing.

The product line encompasses six core carbon steel grades, each with well-defined chemical and mechanical properties, tailored to adapt to varying load requirements and application scenarios while adhering to their respective international standards.

S235jr and S275jr, compliant with EN 10025 standards, are European non-alloy structural steel grades. S235jr features a minimum yield strength of 235MPa and a tensile strength range of 360-510MPa, offering good ductility and weldability for light to medium-duty applications. S275jr, with a minimum yield strength of 275MPa and tensile strength of 410-560MPa, provides enhanced load-bearing capacity, suitable for medium-duty structural framing and support.

ASTM A36, a widely used American general-purpose carbon steel grade, has a minimum yield strength of 250MPa and tensile strength of 400-550MPa. With a maximum carbon content of 0.25%, it boasts excellent weldability and formability, making it a staple in global construction for general framing, brackets, and light to medium-load components.

ASTM A572 Gr50 and Gr60 are high-strength low-alloy (HSLA) carbon steel grades, engineered for heavy-duty applications. A572 Gr50 offers a minimum yield strength of 345MPa and tensile strength of 450-550MPa, while Gr60 provides a minimum yield strength of 415MPa and tensile strength of 520-650MPa. Both grades contain trace alloying elements that enhance strength and fatigue resistance, making them ideal for heavy-load structures such as bridge frames, industrial plant main supports, and large-scale infrastructure reinforcement.

SS400, adhering to JIS G 3101 standards, is a Japanese general-purpose carbon steel grade with a minimum yield strength of 245MPa and tensile strength of 400-510MPa. It features flexible chemical composition control, excellent weldability, and cost-efficiency, serving as a versatile alternative for global projects requiring reliable basic structural performance.

All six grades maintain strict control over harmful impurities, with phosphorus ≤0.045% and sulfur ≤0.045%, effectively preventing material brittleness and improving long-term durability. Their carbon-based composition ensures good corrosion resistance in normal atmospheric conditions; for humid, corrosive, or coastal environments, additional anti-corrosion treatments (such as hot-dip galvanization, painting, or powder coating) can be applied to extend service life and preserve structural integrity.

Processability is a key advantage of this standard unequal and equal carbon angle steel. All variants can be easily cut, bent, welded, and drilled on-site without compromising mechanical properties, adapting to custom fabrication and installation needs. Strict quality control measures are implemented throughout production-from raw material inspection and chemical composition testing to hot-rolling parameter monitoring and dimensional verification-ensuring each batch meets or exceeds international standards.

With its diverse grade options, dual configurations, and reliable performance, ASTM S235jr S275jr A572 Gr50 Gr60 A36 Ss400 standard unequal equal carbon angle steel caters to the full spectrum of structural needs. From light-duty residential framing to heavy-duty industrial and infrastructure projects, it combines versatility, durability, and cost-efficiency, providing a practical and high-quality structural solution for global customers.