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Help CenterSteel Billet，Steel Round Bar: Types, Specifications, Applications & Complete Export Guide
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Steel Round Bar: Types, Specifications, Applications & Complete Export Guide
Steel round bar is a solid long‑steel product with circular cross‑section, one of the most versatile raw materials for machinery manufacturing, construction, energy and heavy‑industry projects. It can be further forged, turned, milled and welded into finished mechanical spare parts, structural shafts and engineering components. Hot‑rolled, forged and cold‑drawn round bars manufactured in China are widely exported to Southeast Asia, Middle East, Africa, Europe and South‑America markets for industrial‑grade procurement.
1. Main Production Types
Round bars are mainly divided by manufacturing technology, each with unique performance features:
• Hot‑rolled Round Bar: The most common export type. Cost‑effective, suitable for general structural parts and subsequent forging processing. Wide diameter range from 16 mm‑300 mm.
• Forged Round Bar: High‑density internal structure, excellent tensile strength, good impact resistance. Perfect for large‑diameter, heavy‑load components, oil‑gas equipment and high‑stress machinery parts.
• Cold‑drawn Round Bar: High surface smoothness, tight dimensional tolerance. Less machining allowance, ideal for precision mechanical components.
2. Popular Steel Grades & Material Series
Carbon Steel Round Bar
Q235B, Q355B, 20#, 45#
SAE 1010, SAE 1020, SAE 1045, A36, S235JR, S355JR
Alloy Steel Round Bar
40Cr, 42CrMo, 20CrMnTi, 4140, 4340
High strength, wear‑resistant, for heavy‑duty transmission shafts and equipment accessories.
Stainless Steel Round Bar
304, 316L, 420, 430
Anti‑corrosion property, applied in marine, chemical and food‑processing industries.
3. Standard Export Specifications
• Diameter range: 16mm‑600mm
• Standard length: 6 m / 12 m, custom fixed‑length cutting available
• Surface condition: Black hot‑rolled finish, polished, peeled, galvanized
• Tolerance: Meet ASTM, EN, GB dimensional tolerance requirements
4. Wide Application Fields
Round bar is a semi‑finished material for downstream fabrication, covering multiple key industries:
• Machinery Manufacturing: Shafts, gears, bolts, hydraulic parts, forging blanks
• Construction Industry: Structural supports, foundation anchor bolts, fence posts
• Oil & Energy Sector: Drill parts, valve components, power‑plant mechanical accessories
• Transportation Industry: Truck, train and ship spare‑part raw material
• Mining & Heavy Equipment: Wear‑resistant parts, connecting rods, heavy‑load components
5. International Standards & Export Documents
Our round bars can comply with global mainstream standards for different importing‑country inspection requirements:
• Chinese Standard: GB/T 702‑2018 Hot‑rolled round steel
• American Standard: ASTM A108, A576
• European Standard: EN 10060, EN 10083
• Third‑party inspection: SGS, BV, Intertek test reports upon buyer’s request
Required Shipping Documents
1. Mill Test Certificate (MTC), including chemical composition and mechanical property data
2. Commercial Invoice, Packing List
3. Certificate of Origin
4. CE‑DoP documents for European construction‑project orders
HS‑Code reference:721499 (carbon hot‑rolled round bar)
6. Packaging & Shipment
Round‑bar export packaging prevents surface scratch, rust and deformation during long‑sea transit:
• Bundled with high‑strength steel straps
• Each bundle marked clearly with grade, diameter, heat number and batch number
• Waterproof plastic wrapping for anti‑rust protection
• Shipment options: 20GP / 40GP container loading or bulk break‑vessel shipment for large orders
7. Supplier Advantages & Custom‑Made Service
As a reliable Chinese round‑bar exporter, we supply both spot goods and bulk long‑term contract orders:
✅ Complete carbon steel, alloy steel, stainless‑steel grades available
✅ Support hot‑rolled, forged, cold‑drawn, peeling and galvanized surface treatment
✅ Strict chemical‑composition and mechanical‑performance quality control
✅ Flexible MOQ, competitive factory FOB & CFR price terms
✅ Full set of export documents, fast production lead‑time
If you are searching for qualified round‑bar supplier, kindly send us your required diameter, steel grade, quantity and destination port. We will provide you our latest quotation without delay.
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Steel Round Bar, Hot Rolled Round Bar, Forged Round Bar, Alloy Steel Round Bar, SAE 1045 Round Bar, Round Bar Export
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