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ASTM A108 1018 Cold Drawn Carbon Steel Bar | Easy Machining Steel Rod for Shafts & Mechanical Parts
Comparison of Chemical Composition of ASTM A108 1018 Cold Drawn Carbon Steel Bar (%)
Chemical Composition Table (Refer to AISI/SAE 1018 Component Range)
| Element | Content (%) |
| C (Carbon) | 0.15 – 0.20 |
| Mn (Manganese) | 0.60 – 0.90 |
| P (Phosphorus) | ≤ 0.040 |
| S (Sulfur) | ≤ 0.050 |
| Fe (Iron) | Balance |
Notes:
| Item | Description |
| Standard System | ASTM A108 follows AISI/SAE 1018 chemical composition system |
| Material Type | Low carbon steel |
| Properties | Good plasticity and toughness |
| Processing | Easy to machine and weld |
| Applications | Suitable for cold drawn bars, shafts, and general mechanical parts |
Comparison Table of Mechanical Properties of ASTM A108 1018 Cold Drawn Carbon Steel Bar
| Property | Typical Value | Unit | Notes |
| Tensile Strength (UTS) | 440 – 630 | MPa | Depends on cold draw / heat treatment |
| Yield Strength (YS) | 370 | MPa | 0.2% offset |
| Elongation (in 50 mm) | 15 – 20 | % | Indicates ductility |
| Brinell Hardness (BHN) | 120 – 180 | HB | Cold drawn |
| Rockwell Hardness (HRB) | 70 – 90 | HRB | Cold drawn |
| Reduction of Area | 40 – 50 | % | Typical for low carbon steel |
Complete Specifications of ASTM A108 1018 Cold Drawn Carbon Steel Bar
| Nominal Diameter (inches) | Nominal Diameter (mm) | Tolerance (mm) | Standard Length (m) | Notes |
| 1/4" | 6.35 | ±0.05 | 1 – 6 | Cold drawn, round bar |
| 3/8" | 9.53 | ±0.05 | 1 – 6 | |
| 1/2" | 12.7 | ±0.05 | 1 – 6 | |
| 5/8" | 15.88 | ±0.06 | 1 – 6 | |
| 3/4" | 19.05 | ±0.06 | 1 – 6 | |
| 1" | 25.4 | ±0.08 | 1 – 6 | |
| 1 1/4" | 31.75 | ±0.10 | 1 – 6 | |
| 1 1/2" | 38.1 | ±0.10 | 1 – 6 | |
| 2" | 50.8 | ±0.12 | 1 – 6 | |
| 2 1/2" | 63.5 | ±0.15 | 1 – 6 | |
| 3" | 76.2 | ±0.15 | 1 – 6 | |
| 4" | 101.6 | ±0.20 | 1 – 6 |
Notes:
Tolerance: Cold drawn bars have tighter tolerances than hot rolled bars.
Length: Standard stock length usually 1 – 6 meters; can be cut-to-size on request.
Surface Finish: Cold drawn, smooth surface, suitable for shafts, pins, and mechanical parts.
Customization: Other diameters and lengths can be supplied based on customer requirements.
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| Customization Category | Options | Description / Notes |
| Dimensions | Diameter, Length | Diameter: Ø10–Ø100 mm (may be customized); Length: 6 m / 12 m or cut-to-length as per project requirements |
| Processing | Cutting, Threading, Bending, Machining | Bars can be cut, threaded, bent, drilled and machined as per drawing or requirements of application. |
| Surface Treatment | Black, Pickled & Oiled, Galvanized, Painted | Choose for indoor/outdoor application and resistance to corrosion. |
| Straightness & Tolerance | Standard / Precision | Straightness and dimensional tolerances can be controlled on request |
| Marking & Packaging | Custom Labels, Heat No., Export Packing | Labels: size, grade (ASTM A572 Grade 50), heat number; packaged in steel strapped bundles ideal for container shipping or local delivery |
Notes Added to Proof:
Small Round Steel (6–25mm): used for mechanical parts, bolts, and shaft parts;
Medium Round Steel (25–200mm): popular application within building structure, bridges and engineering machinery parts;
Q345 is a low alloy high strength steel which possesses a much higher load bearing capacity than Q235 and Q275, is applicable for the high strength application;
Data in the tables are according to the standards of GB/T 699-1999 (Carbon Structural Steel) and GB/T 700-2006 (Low-alloy High-strength Steel).
Structural Supports
Beams, columns, baseplates, brackets, and other load bearing elements needing strength and durability.
Steel Structures & Buildings
Light to heavy steel structures for factories, bridges, workshops, warehouses and associated construction elements.
Machinery & Equipment Parts
Frames, mounts, shafts and mechanical parts that require strength and durability.
Fabricated Steel Products
Welded weldments & plates for structural, industrial and general fabrication purposes.
1. Packaging Methods
Bundling and Tying Up Steel bars are tied up into bundles as per size and length specifications using steel or plastic straps, for easy carrying, loading and unloading.
Wooden Pallet Support: Medium to large diameter steel bars are supported by wooden pallets to prevent the bar from potential uneven stress or bending.
Moisture and rust proof: The surface layer is sprayed with anti-rust oil or sealed with an anti-moisture film. Desiccants are inserted into the bundles to protect against moisture and rust during transportation.
Customization: Length cutting, sleeve protection, or special packaging on the customers׳ request.
2. Transportation Methods
Road Transport: Good for transporting in short distance or delivery to construction site.
The steel bars are tightly bundled to avoid immediately rolling and crashing so that they can arrive at destinations safety.
Rail Transportation: Applicable for steel delivery in long distance for a large volume.
Full truckload transportation, support frames, steel straps for safely mounting full truckload transportation, support frames full truckload strapping for safely mounting full truckload transportation, support frames full truckload strapping.
Ocean Transportation: Proper for the steel export / long distance bulk delivery.
Containers, bulk cargo or open-top containers - we can be flexible with the arrangements according to the nature of your cargo and your port of destination.
3. Advantages
The steel bars are steamed, water cleaned, dried, oil applied and wrapped up with several layers of newsprint before tapes wrapped around hold everything together.
Diverse transportation packages pool efficiency and safety for domestic and global logistics.
Stable cooperation with shipping companies such as MSK, MSC, COSCO efficiently logistics service chain, logistics service chain are we to your satisfaction.
We follow the standards of quality management system ISO9001 in all procedure, and have strict control from packaging material purchase to transport vehicle scheduling. This guarantees the H-beams from the factory all the way to the project site, helping you build on a solid foundation for a trouble free project!
1. What is ASTM A108 1018 cold drawn carbon steel bar?
A low carbon bar conforming to ASTM A108 with the chemistry of 1018 carbon steel. Cold drawing raises the strength, surface finish, and dimensional accuracy. Commonly used in pins, shafts, bolts and mechanical parts in general.
2, What is the chemical composition of 1018 carbon steel?
Element Content %
C (Carbon) 0.15 – 0.20
Mn (Manganese) 0.60 – 0.90
P (Phosphorus) ≤ 0.040
S (Sulfur) ≤ 0.050
Fe (Iron) Balanc e
3. What are the Mechanical properties?
PropertyTypical
ValueTensile Strength (UTS)440 – 630 Mpa
Yield Strength (YS)370 Mpa
Elongation15 – 20%
Brinell Hardness (BHN)120 – 180
Rockwell Hardness (HRB)70 – 90
4. What are the standard sizes?
Diameters: 6.35 mm (1/4") – 101.6 mm (4")
standard Length: 1 – 6 meters, can be cut-to-length on request
Tolerances: ±0.05 mm – ±0.20 mm depending on diameter
5. What is it used for?
Shafts, pins, and bolts Mechanical and automotive parts of machinery General engineering parts which have to be machined and are of medium size
6. How does cold drawing affect the steel?
Increases tensile strength and yield strength It enhances surface finish and the dimensional accuracy It still keeps very well ductility for machining and forming
7. Can it be welded or machined?
Sure - 1018 cold drawn is very easy to machine and weld with most processes.
8. How are the products packaged and how are they shipped?
Bundled or strapped with moisture proof packing.
Cover with wooden or metal frame for transportation.
Can be sent by ROAD/ RAIL / SEA.
9. How to inquire for quotation or sample?
Contact your supplier by diameter, length, quantity and surface finish required.
Free samples are generally available for testing or evaluation.
Contact Details
Address
Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
Phone
Hours
Monday-Sunday: 24-hour Service
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