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Square steel bar is a long steel product with a square cross-section, typically manufactured through hot rolling, cold drawing, or forging processes. It features sharp corners, precise dimensions, and excellent mechanical properties. Square steel bars can be classified into hot-rolled, cold-drawn, and forged types, and are widely used in machinery manufacturing, building structures, tooling, and decorative applications. Common foreign standards include ASTM A36 (USA), EN 10060 (Europe), JIS G3194 (Japan), and BS 4-1 (UK), with typical grades such as ASTM A36, S235JR (EN), SS400 (JIS), and BS 080A15. To search for standard size ranges, use “square steel bar dimensions chart”; to compare grades across countries, use “ASTM A36 vs S235JR equivalent”; for mechanical property requirements, search “square steel tensile strength table”; for tolerance classes, use “hot rolled square bar tolerance standard”.
Square steel bars in China mainly follow GB/T 702 (Hot-rolled Steel Bars – Dimensions, Shape, Weight and Tolerances) and GB/T 905 (Cold-drawn Steel Bars), with common grades including Q235B, Q355B, 45# (high-quality carbon structural steel), and 40Cr (alloy steel). Hot-rolled square bars typically have side lengths ranging from 5 mm to 200 mm, while cold-drawn bars offer higher precision and a smoother surface. To cross-reference Chinese grades with foreign standards, search “Q235B equivalent in ASTM square bar”; for domestic size tables, use “GB/T 702 square steel size list”; to understand the differences between cold-drawn and hot-rolled, search “cold drawn vs hot rolled square bar”; for a sample Chinese mill certificate, use “China square steel mill certificate example”.
Square steel bars are widely used in mechanical components (e.g., shafts, gears, lead screws), building embedments, curtain wall mullions, railing posts, tool handles, mold materials, and electrical fittings. In building construction, square bars are often used as structural support members or decorative grilles. In machinery manufacturing, cold-drawn square bars are widely used as guide rods and transmission parts due to their high dimensional accuracy. For mechanical applications, search “square steel bar for machine shaft use”; for curtain wall mullion design, use “square steel mullion curtain wall detail”; for electrical fittings standards, search “square steel for electrical fittings specification”; for installation guidance, use “square steel post installation guide”.
In international sourcing, key factors to consider include steel grade, side length dimensions, length, straightness, twist, and surface quality. Common surface treatments include black (unfinished), bright (cold-drawn), ground, or galvanized. European grade S235JR is suitable for general structures, ASTM A36 is the most widely used in the USA, and SS400 (JIS) is common in Southeast Asian markets. For surface finish standards, search “square steel surface finish specification”; to compare machinability across materials, use “Q235B vs 45# steel machinability”; for international spot prices, use “square steel bar price per ton 2025 USA”; for a global supplier directory, use “square steel suppliers Europe directory”.
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