AISI 1020 Carbon Steel Round Bar
AISI 1020 is a versatile low-carbon steel round bar with excellent weldability, good machinability, and the ability to be case-hardened. Diameter from 6mm to 500mm, available in hot rolled, cold drawn, and peeled conditions for shafts, machinery components, and welded fabrication.
| Material | Carbon Steel (Low Carbon) |
|---|---|
| Grade / Standard | AISI 1020 / SAE 1020 |
| Diameter | 6mm - 500mm |
| Length | 3m / 6m / 12m (or cut to length) |
| Delivery Condition | hot_rolled / cold_rolled / normalized / quenched_tempered / annealed / as_rolled |
| Surface Treatment | bare / polished / coated |
| MOQ | 1 Ton |
| Delivery Time | 10-25 Days / In Stock |
| Loading Port | Tianjin / Shanghai / Qingdao |
Overview of AISI 1020 Carbon Steel Round Bar
AISI 1020 is one of the most commonly used low-carbon steel round bars in global manufacturing and engineering applications. Specified under AISI/SAE 1020 standard with carbon content typically 0.17-0.23%, this grade offers an excellent combination of weldability, machinability, and ductility at an economical price point. AISI 1020 round bar is the preferred choice for parts that require moderate strength with extensive cold working, machining, or welding operations.
With a tensile strength of approximately 380-470 MPa in the as-rolled condition and the ability to be case-hardened through carburizing or surface hardening processes, 1020 steel round bar provides versatility for both unhardened structural applications and hardened wear-resistant components. It is widely stocked by steel service centers worldwide due to its proven performance and consistent quality.
Key Features and Manufacturing Methods
AISI 1020 carbon steel round bar is manufactured through three primary processes: hot rolled (HR), cold drawn (CD), and turned/peeled. Hot rolled bars provide the most economical option with mill scale surface, suitable for general fabrication and applications where surface finish is not critical. Cold drawn bars offer improved dimensional accuracy, better surface finish (Ra 1.6-3.2μm), and enhanced mechanical properties through cold working strain hardening.
The round bar is supplied in diameter range from 6mm to 500mm, with standard lengths of 3 meters, 6 meters, and 12 meters. Custom cutting service is available for specific length requirements. Surface conditions include black (mill finish), bright (cold drawn), peeled, and ground depending on application needs. The grade can be supplied as-rolled, normalized, annealed, or quenched and tempered (Q+T) heat treatment conditions.
Main Applications of AISI 1020 Round Bar
AISI 1020 carbon steel round bar is extensively used in machinery component manufacturing including shafts, axles, pins, spindles, couplings, and structural fasteners. The grade’s excellent weldability makes it ideal for welded fabrications, machine bases, fixtures, and welded structural assemblies. Its good machinability supports high-volume production of turned parts on CNC lathes, automatic screw machines, and multi-spindle machinery.
The automotive industry uses 1020 round bar for non-critical shafts, brackets, gears (after carburizing), and assembly components. In the agricultural equipment sector, it serves as raw material for tillage tools, harvester parts, and tractor components. Other applications include construction equipment pins and rollers, hydraulic cylinder rods (after surface treatment), conveyor system shafts, hand tool handles, and general mechanical engineering components requiring case-hardened wear surfaces over a tough core.
Why Choose Us for AISI 1020 Carbon Steel Round Bar
Shandong Tanglu Metal Material Co., Ltd. supplies premium AISI 1020 carbon steel round bar sourced from major Chinese special steel mills with stable production processes and reliable quality assurance. We offer flexible diameter ranges from small 6mm bars for precision components to large 500mm bars for heavy machinery applications, with multiple delivery conditions including hot rolled, cold drawn, peeled, and heat-treated options.
With monthly supply capacity of 8,000 tons of carbon steel bars and established export experience to over 50 countries, we support both small trial orders for product evaluation and large bulk orders for ongoing manufacturing supply. Each shipment includes original mill test certificate (MTC) conforming to EN 10204 3.1 standard, with EN 10204 3.2 and third-party inspection (SGS, BV, ABS, DNV, LR) available upon request for critical project applications.
📐 Dimension & Size Table
| Diameter (mm) | Length (m) | Weight (kg/m) | Tolerance |
|---|---|---|---|
| 6 | 3 / 6 | 0.222 | ± 0.30mm |
| 8 | 3 / 6 | 0.395 | ± 0.30mm |
| 10 | 6 / 12 | 0.617 | ± 0.30mm |
| 12 | 6 / 12 | 0.888 | ± 0.40mm |
| 16 | 6 / 12 | 1.578 | ± 0.40mm |
| 20 | 6 / 12 | 2.466 | ± 0.40mm |
| 25 | 6 / 12 | 3.853 | ± 0.50mm |
| 30 | 6 / 12 | 5.549 | ± 0.50mm |
| 40 | 6 / 12 | 9.864 | ± 0.60mm |
| 50 | 6 / 12 | 15.413 | ± 0.80mm |
| 60 | 6 / 12 | 22.195 | ± 0.80mm |
| 80 | 6 / 12 | 39.458 | ± 1.10mm |
| 100 | 6 / 12 | 61.654 | ± 1.30mm |
| 150 | 3 / 6 | 138.722 | ± 1.80mm |
| 200 | 3 / 6 | 246.617 | ± 2.50mm |
| 250 | 3 / 6 | 385.339 | ± 3.50mm |
| 300 | 3 / 6 | 554.888 | ± 4.50mm |
| 400 | 3 / 6 | 986.467 | ± 6.00mm |
| 500 | 3 / 6 | 1541.354 | ± 8.00mm |
* Custom sizes available upon request. Tolerances per relevant international standards.
🔬 Chemical Composition
| Element | Min | Max | Display Value | Note |
|---|---|---|---|---|
| C | 0.17 | 0.23 | 0.17-0.23 | Low carbon range |
| Mn | 0.30 | 0.60 | 0.30-0.60 | |
| P | - | 0.040 | ≤0.040 | |
| S | - | 0.050 | ≤0.050 | |
| Si | 0.17 | 0.37 | 0.17-0.37 | |
| Cr | - | 0.25 | ≤0.25 | Residual element |
| Ni | - | 0.25 | ≤0.25 | Residual element |
| Cu | - | 0.25 | ≤0.25 | Residual element |
* Chemical composition may vary by heat, thickness and specification. Please refer to the actual mill test certificate.
⚙️ Mechanical Properties
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Hot Rolled) | 380-470 | MPa | As-rolled condition |
| Yield Strength (Hot Rolled) | ≥245 | MPa | Diameter ≤25mm |
| Elongation | ≥25 | % | Gauge length 50mm, hot rolled |
| Reduction of Area | ≥55 | % | Hot rolled condition |
| Brinell Hardness | 111-156 | HBW | Hot rolled / Annealed |
| Impact Energy | ≥31 | J | Charpy V-notch at 20°C |
| Tensile Strength (Cold Drawn) | 440-590 | MPa | Cold drawn condition |
| Yield Strength (Cold Drawn) | ≥370 | MPa | Cold drawn condition |
* Values shown are minimum requirements unless otherwise stated.
📦 Commercial Information
| Packaging | Standard seaworthy export packing. Round bars bundled in hexagonal bundles with 3-5 steel strapping bands per bundle, weight typically 2-5 tons per bundle. Plastic end caps for bars over 50mm diameter. Each bundle clearly tagged with heat number, grade, diameter, and length. Custom packaging including wooden crates available for premium polished bars or international air shipment. |
|---|---|
| Payment Terms | T/T (Telegraphic Transfer),L/C (Letter of Credit),D/P (Documents against Payment),Western Union,PayPal |
| Price Term | FOB,CFR,CIF,EXW |
| Supply Capacity | 8,000 Tons/Month (Carbon Steel Bars) |
| Loading Port | Tianjin / Shanghai / Qingdao |
Why Choose Our AISI 1020 Carbon Steel Round Bar?
Mill Certified Quality Assurance
AISI 1020 round bar supplied with original mill test certificate EN 10204 3.1/3.2, including chemical composition analysis, mechanical test results, hardness verification, and complete metallurgical traceability from heat to finished bar.
Comprehensive Diameter Range
Diameter range from 6mm precision bars to 500mm heavy industrial bars, available in standard 3m / 6m / 12m lengths. Custom cutting and length requirements supported with precision tolerance per ISO 286 h11/h13.
Multiple Surface Finish Options
Available in hot rolled (black), cold drawn (bright), peeled, and ground surface finishes. Cold drawn bars achieve surface roughness Ra 1.6-3.2μm, suitable for direct CNC machining without additional surface preparation.
Heat Treatment Flexibility
Available in as-rolled, normalized, annealed, or Q+T heat treatment conditions. Custom heat treatment per customer specification including stress relieving, isothermal annealing, and case-hardening preparation supported.
Reliable Stock and Production
Common diameters maintained in stock for 7-15 days dispatch. Custom production cycle 25-35 days. Container loading optimized for 20FT and 40FT containers with up to 27 tons payload capacity for standard size bars.
🏭 Applications of AISI 1020 Carbon Steel Round Bar
AISI 1020 carbon steel round bar is the industry workhorse for general machinery component manufacturing including transmission shafts, axles, motor shafts, conveyor rollers, hydraulic cylinder rods, and pump shafts. Its excellent weldability makes it ideal for welded fabrications, machine frames, jig and fixture bases, and welded structural assemblies. The grade's superior machinability supports high-volume production of turned components on CNC lathes, automatic screw machines, and Swiss-type lathes for fasteners, bushings, spacers, and precision turned parts. After carburizing or case-hardening treatment, 1020 round bar is widely used in automotive gears, spline shafts, agricultural equipment tines, construction machinery pins, and mining equipment wear components requiring tough core with hardened wear surface.
📋 Quality & Certification
Our Certifications
- ✅ ISO 9001:2015
- ✅ CE Marking
- ✅ ABS
- ✅ DNV GL
- ✅ Lloyd's Register (LR)
- ✅ Bureau Veritas (BV)
- ✅ SGS Certified
- ✅ NK
- ✅ RINA
Mill Certificate Type
- 📋 EN 10204 3.1
- 📋 EN 10204 3.2
- 📋 Original Mill Certificate
- 📋 Third Party Inspection Available
- 📋 Certificate of Origin
❓ Frequently Asked Questions
What is AISI 1020 carbon steel round bar?
AISI 1020 is a low-carbon steel round bar specified under AISI/SAE 1020 standard with carbon content of 0.17-0.23%. It is one of the most widely used carbon steel grades for general engineering applications, offering an excellent balance of weldability, machinability, ductility, and economical pricing. The bar is suitable for shafts, machinery components, welded fabrications, and case-hardened parts requiring tough core with hardened wear surface.
What is the equivalent grade of AISI 1020?
AISI 1020 has equivalent grades in multiple international standards: SAE 1020 (US Society of Automotive Engineers), ASTM A108 1020 (US specification), EN C22 / 1.0402 (European standard EN 10083), DIN C22 (German standard), JIS S20C (Japanese standard JIS G4051), and GB 20# or GB 20 (Chinese standard GB/T 699). While these grades share similar mechanical properties and chemical composition, exact substitution should be verified against specific project requirements.
What is the difference between hot rolled and cold drawn AISI 1020?
Hot rolled AISI 1020 has rougher surface (mill scale), wider dimensional tolerance (typically ±0.5-1mm), lower mechanical properties (tensile 380-470 MPa, yield ≥245 MPa), and lower cost. It is suitable for applications where surface finish and tight tolerance are not critical. Cold drawn AISI 1020 offers superior surface finish (Ra 1.6-3.2μm), tighter tolerance (h11/h13), enhanced mechanical properties (tensile 440-590 MPa, yield ≥370 MPa) due to strain hardening, and is preferred for direct CNC machining without further surface preparation.
Can AISI 1020 round bar be heat treated and case-hardened?
Yes. AISI 1020 is excellent for case-hardening through carburizing, carbonitriding, or induction surface hardening. The low carbon core remains tough and ductile while the surface achieves high hardness (typically HRC 55-62) for wear resistance. The grade can also be normalized (840-870°C) for refined grain structure, annealed (840-870°C) for improved machinability, or quenched and tempered (Q+T) for moderate strength enhancement. Through-hardening is not effective due to the low carbon content.
What sizes and lengths are available for AISI 1020 round bar?
AISI 1020 round bar is available in diameter range from 6mm to 500mm. Standard lengths include 3 meters, 6 meters, and 12 meters, with custom cut-to-length service supported for specific project requirements. Diameter tolerance per ISO 286 h11 (for cold drawn) or DIN 1013 (for hot rolled). For diameters over 200mm, lengths are typically 3-6 meters due to forging or rolling process limitations. Special long lengths up to 18 meters available for selected sizes upon request.
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AISI 1020 Carbon Steel Round Bar
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