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Help CenterSquare Steel- Carbon Steel: Q235B / S235JR, Q355B / S355JR, 20#, 45# / 1045 / C45
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Square Steel Bar – Complete Product Description
1. Product Overview
Square Steel Bar is a solid square cross-section structural steel profile, manufactured by hot rolling, cold drawing and forging processes. Different from hollow square steel tubes, square bars feature solid structure, uniform stress bearing, stable straightness and excellent weldability and machinability. It is one of the most widely used basic steel materials in construction, machinery manufacturing, engineering and heavy industry.
Our square steel bars strictly comply with GB, ASTM, EN and JIS international standards, with complete material grades, precise dimensional tolerance and stable mechanical performance. Custom processing and export packaging are fully supported.
2. Product Classification & Features
Hot Rolled Square Steel Bar
- Mainstream stock specification
- Side dimension: 5mm–250mm
- Standard length: 6m / 9m / 12m
- Feature: low cost, good toughness, easy welding and cutting
- Application: building steel structure, equipment base, support frame, embedded parts
Cold Drawn Square Steel Bar
- High precision bright finish
- Tighter tolerance: ±0.1mm–0.5mm
- Smooth surface, no oxide scale, high straightness
- Higher strength and small machining allowance
- Application: mechanical accessories, guide rail, mold blank, precision parts
Forged Square Steel Bar
- Dense grain structure, high impact resistance
- Excellent fatigue resistance and load-bearing performance
- Application: heavy machinery, wind power parts, ship and engineering components
Surface Treatment
Available in black hot rolled finish, galvanized finish, polished finish for anti-rust and decorative requirements.
3. Main Material Grades
- Carbon Steel: Q235B / S235JR, Q355B / S355JR, 20#, 45# / 1045 / C45
- Alloy Steel: 40Cr, 42CrMo, 20CrMnTi
- Stainless Steel: 304, 304L, 316, 316L
All materials have reliable toughness, hardness and structural stability for different industrial scenarios.
4. Size & Technical Parameters
- Side size: 3mm–250mm (custom sizes available)
- Standard length: 6m, 9m, 12m
- Custom cutting: any length from 100mm to 12m
- Straightness: ≤3mm per meter
- Weight formula: Kg/m = Side(mm) × Side(mm) × 0.00785
- Zero cracks, no burrs, no twisting deformation
5. Mechanical Properties
- Q235B: Yield ≥235MPa, Tensile 375–500MPa, Elongation ≥25%
- Q355B: Yield ≥355MPa, Tensile 470–630MPa, Elongation ≥21%
- 45# Steel: High hardness and wear resistance after quenching and tempering
- 304 Stainless Steel: Yield ≥205MPa, Tensile ≥520MPa, excellent corrosion resistance
6. Application Fields
- Construction Industry: factory frames, building supports, handrails, embedded steel parts
- Mechanical Manufacturing: machine base, frame structure, shaft parts, mold blanks
- Automobile & Engineering: vehicle beam, mechanical load-bearing components
- Chemical & Food Industry: stainless steel square bars for anti-corrosion equipment
- Hardware & Mold Industry: precision cold drawn square steel for fixture and mold processing
7. Packaging & Shipment
- Packing: steel strip bundling, waterproof plastic covering, export woven bag package
- Standard export packing for container shipment
- Each bundle marked with standard label: grade, size, weight, batch number
- Mill Test Certificate (MTC) provided
- Delivery time: 5–7 days for stock orders, 7–15 days for customized production
- Support shipment from Qingdao Port, Tianjin Port for global trade
8. Product Advantages
1. Solid and stable structure with uniform force bearing
2. Complete specifications from small precision size to large heavy-duty size
3. Multiple grades of carbon steel, alloy steel and stainless steel for diverse demands
4. Support cutting, bending, drilling, galvanizing and deep processing
5. Strict quality inspection and international standard compliance
6. Stable supply and professional export service for global clients
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