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Help CenterSteel Round Bar & Round Steel Bar，GB/T 702-2017、ASTM A36、EN 10060、GB/T 905、GB/T 3078、EN 10278
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Round Steel Bar Product Detailed Specification
1. Product Overview
Round steel bar is a long steel product with a solid circular cross-section, also known as round rod or steel bar in the industry. It is formed by hot rolling, cold drawing and forging processes. Its material grades cover plain carbon steel, high-quality carbon structural steel, alloy steel, stainless steel, bearing steel, etc. Featuring balanced strength, easy machinability, good weldability and heat treatability, it serves as a universal basic raw material for construction, machinery, automobile, mold and hardware industries.
2. Product Classification by Production Process
2.1 Hot Rolled Round Bar
Applicable Standards: GB/T 702-2017, ASTM A36, EN 10060
Process: Rolled after high-temperature heating of steel billets, with black oxide scale on surface
Sizes: Φ5.5mm – Φ500mm, standard length 4–12 meters
Dimensional tolerance: ±0.5~±1.2mm with loose tolerance range
Advantages: Low cost, excellent plasticity and toughness, easy for forging and welding
Applications: Building steel structures, mechanical blanks, rough machining of shafts, raw materials for fasteners
2.2 Cold Drawn Bright Round Bar
Applicable Standards: GB/T 905, GB/T 3078, EN 10278
Process: Cold drawing at room temperature to remove oxide scale with bright clean surface
Sizes: Φ3mm – Φ120mm, standard fixed length 3/6 meters
High dimensional accuracy: h7/h8/h9 precision grade, tolerance ±0.02~±0.15mm
Advantages: Precise dimension, smooth surface, improved hardness, no secondary turning required
Applications: Precision machinery, automatic lathe parts, bolts, pin shafts, hydraulic fittings
2.3 Forged Round Bar
Sizes: Custom large diameter Φ100mm – Φ800mm
Advantages: Dense internal structure without porosity, high pressure and impact resistance
Applications: Large gears, work rolls, heavy-duty equipment spindles, construction machinery components
3. Main Material Grades & Applicable Standards
3.1 Carbon Structural Steel (General Construction Use)
Q195/Q215/Q235/Q275 | GB/T700Application: Scaffolding, supports, ordinary bolts, simple steel structuresMechanical Property: Yield strength 235MPa, easy to weld, cost-effective
3.2 High-quality Carbon Structural Steel (Mainstream for Machining)
10#, 20#, 35#, 45#, 60# | GB/T699
20#: Low carbon grade, for cold heading, welded parts and sleeves
45#: Medium carbon grade, widely used for shafts, gears, connecting rods and standard fasteners
3.3 Alloy Structural Steel (High Strength & Wear-resistant Parts)
20Cr, 40Cr, 42CrMo, 35CrMo, 20CrMnTi | GB/T3077
40Cr: Quenched & tempered shafts, mold accessories, automobile half shafts
42CrMo: Heavy-load spindles, hydraulic cylinder tubes, engineering machinery parts
3.4 Special Round Steel Bars
Bearing Steel GCr15: Bearing sleeves, rollers, wear-resistant roll shafts
Spring Steel 65Mn: Springs, spring plates, wear-resistant fittings
Stainless Steel Round Bar 304/316L: Anti-corrosion equipment, chemical pipeline fittings
Free-cutting Steel Y12/Y40Mn: Mass production parts for high-speed automatic lathes
4. Complete Specification Parameters
4.1 Diameter Range
Hot rolled: Φ5.5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 30, 32, 35, 40, 45, 50, 60, 70, 80–500mm
Cold drawn: Φ3, 4, 5, 6, 7, 8, 9, 10, 12, 14–120mm
4.2 Standard Length
Random length: 4–12m (hot rolled); 3–6m (cold drawn)
Customization: Fixed length / multiple length from 1m to 12m, short length proportion ≤10%
Theoretical Weight Formula: Weight per meter (kg/m) = Diameter(mm) × Diameter(mm) × 0.00617
4.3 Optional Surface Treatment
Hot rolled black finish (raw material)
Cold drawn bright finish, peeled finish, centerless grinding polished finish
Anti-rust treatment: Anti-rust oil coating, VCI anti-rust film, hot-dip galvanizing, blackening & phosphating
5. Core Mechanical Properties (Reference for 45# Hot Rolled Round Bar)
Tensile Strength ≥600MPa
Yield Strength ≥355MPa
Elongation ≥16%
Brinell Hardness HB 170–220Heat delivery status including normalizing, annealing, quenching & tempering, quenching can be provided as customer requirements.
6. Application Fields
Construction Engineering: Workshop frames, embedded parts, foundation bolts, bridge supports, steel structure connectors
General Machinery: Transmission shafts, gear blanks, pin shafts, flange blanks, pump & valve fittings
Automobile Manufacturing: Half shafts, crankshaft blanks, gearbox parts, chassis fasteners
Hardware Fasteners: Bolts, nuts, screw rods, rivets, cold heading standard parts
Mould & Heavy Industry: Mold cores, work rolls, mining wear-resistant parts, large hydraulic equipment
Chemical Anti-corrosion: 304/316 stainless steel round bars for seawater and acid-alkali equipment components
7. Packaging, Marking & Logistics
7.1 Packaging
Small diameter (≤32mm): Bundled with steel strip, 1–3 tons per bundle, wrapped with waterproof plastic film outside
Large diameter heavy round bars: Single/multi-piece bundled with labels attached on bar ends
Export package: Fumigated wooden pallets, anti-rust oil, wrapped with VCI anti-rust paper
7.2 Marking
Each bundle is labeled with material grade, diameter, length, heat number, net weight, execution standard and factory logo.
7.3 Delivery Cycle
Regular spot specifications: 5–7 days delivery, shipped from Tianjin Port
Custom special materials & heat treatment products: 7–15 days delivery
7.4 Minimum Order Quantity
1 ton minimum order, mixed batch available, cutting service supported.
8. Product Advantages
Stable Material Quality: Original steel mill billets with original material test certificates; spectrum and UT inspection supported by third-party laboratories
Full Range of Specifications: Thousands tons in stock for hot rolled, cold drawn, alloy and stainless steel round bars
One-stop Processing Service: Saw cutting, turning, quenching & tempering, galvanizing, polishing available
Export Compliance: Comply with GB, ASTM, EN international standards; customs declaration and commodity inspection documents available
9. Quality Inspection Items for Each Batch Before Delivery
Spectrum analysis for chemical composition
Tensile & bending mechanical tests
Dimensional tolerance and surface appearance inspection
Macrostructure examination, ultrasonic testing (UT) upon request
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