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Help CenterSteel Round Bar，Q235B, Q195, Q215, 20#, 45#, 35#. Comply With GB/T 700, GB/T 699. Equivalent International Grades: S235JR, S275JR, ASTM A36, SS400.
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1. Product Overview
Round bar is a solid long steel product with a standard circular cross-section, one of the most widely used basic section steels. It is manufactured from high-quality steel billets through hot rolling, cold rolling, cold drawing and forging processes. Our products feature regular appearance, accurate dimensions and stable mechanical properties. The surface finishes include black surface, pickled surface, bright surface and galvanized surface.
We supply a complete range of round bars with full specifications and various materials. All products comply with domestic and international standards. The steel is easy to cut, bend, weld and reprocess. We have abundant stock and support non-standard customization, fixed-length cutting and surface treatment services. Our products are exported worldwide, widely applied in construction, machinery manufacturing, hardware, engineering machinery, auto parts, molds and fastener industries.
2. Production Technology
- Hot Rolled Round Bar: The most popular type with cost-effective price and good toughness, ideal for general construction and ordinary mechanical processing.
- Cold Rolled & Cold Drawn Round Bar: Features tight dimensional tolerance, high straightness and smooth surface. Higher strength and hardness, suitable for precision machinery, shaft parts and high-grade fasteners.
- Precision Drawn Round Bar: Ultra-smooth surface and high precision, no need for secondary polishing, directly used for precision assembly parts.
- Forged Round Bar: Dense internal structure, excellent impact resistance and fatigue resistance, applied to heavy-duty equipment, large spindles and high-pressure components.
3. Main Materials & Standards
Carbon Structural Steel
Q235B, Q195, Q215, 20#, 45#, 35#. Comply with GB/T 700, GB/T 699. Equivalent international grades: S235JR, S275JR, ASTM A36, SS400. Good weldability and machinability, widely used for general structures and hardware parts.
Low Alloy High Strength Steel
Q355B/C/D/E. Excellent low temperature resistance and load-bearing capacity, used for heavy steel structures and engineering machinery components.
Alloy Structural Steel
40Cr, 35CrMo, 42CrMo, 60Si2Mn. High strength, wear resistance and fatigue resistance, for spindles, gears, springs and mold parts.
Stainless Steel
4. Specifications
- Diameter: 6mm - 300mm, custom special sizes available
- Standard Length: 6m, 9m, 12m; custom fixed length from 1m to 12m
- Form: Straight bar, small diameter available in coil
- Tolerance: Standard tolerance for hot rolled bars, precision tolerance for cold drawn bars.
5. Surface Finishes
Black Surface, Pickled Surface, Bright Surface, Hot Dip Galvanized Surface. Hot dip galvanized round bar provides superior anti-corrosion performance for outdoor and marine applications.
6. Advantages
1. Reliable raw materials, stable chemical composition and mechanical properties, quality test reports provided.
2. Complete specifications and sufficient stock, support bulk and small batch orders.
3. One-stop deep processing: cutting, chamfering, polishing, galvanizing and heat treatment.
4. Stable delivery time, rich export experience.
5. Easy for secondary processing, help customers save production cost.
7. Application Scope
Construction engineering, mechanical equipment, hardware products, auto parts, engineering machinery, molds, electric power, municipal engineering and chemical industry.
8. Packaging & Export
Standard bundling packaging with end protection to avoid collision and rust during transportation. We use steel strip, stretch film and tarpaulin for export packaging, suitable for sea and land transportation. Full set of export documents and mill test certificates are available. We support FOB, CIF, CFR and other trade terms, goods are mainly shipped from Qingdao Port with stable delivery cycle.
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