Steel square bars are solid, versatile structural components crafted from carbon or alloy steel, featuring a square cross-section for enhanced strength and rigidity. Available in various sizes and lengths, they can be hot-rolled, cold-drawn, or precision-ground to meet specific tolerances. Surface treatments like galvanizing or painting enhance protection against environmental factors. Renowned for their machinability and weldability, steel square bars serve as essential raw materials for frames, brackets, shafts, and architectural elements, ensuring reliability in demanding applications while adhering to international quality standards such as ASTM and ISO certifications.

ASTM A36 Steel Square Bars, conforming to ASTM A36/A36M and ASTM A6/A6M standards, are carbon structural steel bars with balanced strength and ductility. Composed of 0.25-0.29% carbon, 0.80-1.20% manganese, ≤0.04% phosphorus, and ≤0.05% sulfur, they achieve a minimum yield strength of 250 MPa and tensile strength of 400-550 MPa, with ≥20% elongation. Widely used in construction, bridges, machinery, and automotive sectors, these bars offer excellent weldability, machinability, and cost-effectiveness. Available in hot-rolled or normalized states, their square cross-section ensures structural integrity in assemblies.

A572 Steel Square Bars are high-strength low-alloy (HSLA) structural steel square bars compliant with ASTM A572/A572M, available in grades 42, 50, 55, 60, and 65 (yield strengths 290-450 MPa). Composed of ≤0.23% carbon, 1.00-1.65% manganese, and trace niobium/vanadium/titanium, they balance strength and ductility (≥18% elongation). With tensile strengths 450-620 MPa, these bars excel in heavy-load applications like bridges, building frames, crane girders, and vehicle chassis. Supplied hot-rolled or normalized, they offer superior weldability with low-hydrogen processes and require preheating for thicker sections

1018 Steel Square Bars are mild carbon steel bars with a square cross - section. They are known for their excellent weldability, machinability, and formability. These bars offer good strength and ductility, making them suitable for a wide range of applications, such as in the construction of frames, supports, and general engineering components. Their relatively low cost and versatility have made them a popular choice in various industries.

1045 Steel Square Bars are medium - carbon steel bars with a square profile. They possess higher strength and hardness compared to low - carbon steels like 1018. These bars can be heat - treated to further enhance their mechanical properties, such as increasing hardness and wear resistance. Widely used in manufacturing, they are ideal for making shafts, gears, and various mechanical components that require good strength and durability under moderate loads.

4140 Steel Square Bars are chromium-molybdenum alloy steel products conforming to ASTM A108 standards, renowned for high tensile strength, toughness, and fatigue resistance. These square bars excel in applications requiring durability under heavy loads, such as gears, shafts, bolts, and machinery components. Their heat-treatable nature allows quenching and tempering to achieve desired hardness and mechanical properties. With excellent machinability and wear resistance, they adapt well to precision manufacturing processes. 4140 steel's balanced composition of carbon, manganese, chromium, and molybdenum enhances both strength and toughness, making it ideal for demanding industrial environments.

S235JR Steel Square Bars, conforming to European standard EN 10025-2, are low-carbon structural steel bars with balanced strength and ductility. Composed of ≤0.17% carbon, ≤1.40% manganese, and ≤0.03% phosphorus/sulfur, they achieve a minimum yield strength of 235 MPa and tensile strength of 360-510 MPa, with ≥18% elongation. Widely used in construction, bridges, machinery, and general engineering, these bars offer excellent weldability and machinability. Available in hot-rolled or as-rolled states, their square cross-section (conforming to EN 10059) suits mechanical assemblies.

S275JR Steel Square Bars are structural steel bars with a square cross - section. They conform to European standards and offer a good balance of strength and ductility. These bars exhibit excellent weldability, allowing for easy fabrication in construction projects. With decent toughness, they can withstand normal loads and impacts. S275JR square bars are widely applied in building frameworks, bridges, and general engineering structures where reliable structural performance is required.

S355JR Steel Square Bars are European standard (EN 10025-2) structural steel sections with a minimum yield strength of 355 MPa, offering excellent strength-to-weight ratio and weldability. Composed primarily of carbon (≤0.24%) and manganese (≤1.60%), they exhibit tensile strength between 470-630 MPa and elongation ≥22%, ensuring ductility for cold-forming applications. These square bars are widely used in construction, machinery, and bridges due to their robust mechanical properties and adaptability to welding and machining processes. Their square geometry provides structural rigidity and efficient load distribution, making them ideal for frameworks, supports, and engineering components requiring reliable performance under moderate stress.

SS400 Steel Square Bars are carbon structural steel products compliant with JIS G3101 standards, offering a balance of strength and workability. These square-section bars exhibit good weldability, machinability, and moderate tensile properties, making them suitable for structural frameworks, machinery components, and fabrication projects. Their geometric shape provides enhanced stability in load-bearing applications while facilitating precise alignment during assembly. Available in hot-rolled or cold-drawn finishes with black oxide or galvanized coatings, they resist corrosion in various environments. SS400's uniform composition ensures consistent mechanical performance, and its cost-effectiveness makes it a preferred choice for construction, automotive, and general engineering uses.

Q345 Steel Square Bars, conforming to Chinese standard GB/T 1591, are low-alloy high-strength structural steel bars with excellent mechanical properties. Composed of ≤0.20% carbon, ≤1.70% manganese, ≤0.55% silicon, and trace alloying elements (V, Nb, Ti), they achieve a minimum yield strength of 345 MPa and tensile strength of 470-675 MPa, with ≥21% elongation. Widely used in construction, bridges, machinery, and pressure vessels, these bars excel in demanding environments requiring high strength and toughness.

Q235 Steel Square Bars are Chinese carbon structural steel square bars compliant with GB/T 700 standards, featuring ≤0.22% carbon, 0.30-0.65% manganese, and low phosphorus/sulfur content. With a minimum yield strength of 235 MPa and tensile strength ranging 375-500 MPa, they offer excellent cold-forming capabilities and ≥26% elongation. Supplied in hot-rolled condition, these bars exhibit good weldability and machinability, making them ideal for construction (building frames, scaffolding), machinery (brackets, fasteners), and general engineering applications.