Download the Latest Steel Bar Specifications and Dimensions.
ASTM A108 1045 Carbon Steel Bar | High Strength Steel for Mechanical & Load-Bearing Components
Comparison of Chemical Composition of ASTM A108 1045 Carbon Steel Bar (%)
| Element | ASTM A108 1045 (%) | Typical Notes |
| Carbon (C) | 0.43 – 0.50 | Medium carbon steel, higher strength than 1018 |
| Manganese (Mn) | 0.60 – 0.90 | Improves strength and hardness |
| Phosphorus (P) | ≤ 0.040 | Limits impurities, prevents brittleness |
| Sulfur (S) | ≤ 0.050 | Limits impurities, improves machinability |
| Silicon (Si) | 0.10 – 0.35 | Enhances strength and elasticity |
| Chromium (Cr) | ≤ 0.25 | Trace, improves hardenability |
| Nickel (Ni) | ≤ 0.25 | Trace, improves toughness |
| Copper (Cu) | ≤ 0.25 | Trace, enhances corrosion resistance |
Chemical Composition Table (side-by-side comparison table of 1045 vs 1018)
| Element | ASTM A108 1018 (%) | ASTM A108 1045 (%) | Notes |
| Carbon (C) | 0.15 – 0.20 | 0.43 – 0.50 | 1045 has higher carbon, higher strength and hardness |
| Manganese (Mn) | 0.60 – 0.90 | 0.60 – 0.90 | Same range; improves strength and hardenability |
| Phosphorus (P) | ≤ 0.040 | ≤ 0.040 | Low content to reduce brittleness |
| Sulfur (S) | ≤ 0.050 | ≤ 0.050 | Low content to improve machinability |
| Silicon (Si) | 0.10 – 0.35 | 0.10 – 0.35 | Enhances strength and elasticity |
| Chromium (Cr) | ≤ 0.25 | ≤ 0.25 | Trace, improves hardenability |
| Nickel (Ni) | ≤ 0.25 | ≤ 0.25 | Trace, improves toughness |
| Copper (Cu) | ≤ 0.25 | ≤ 0.25 | Trace, enhances corrosion resistance |
Summary:
ASTM A108 1018 grade steel contains low carbon content. It is easier to machine, has moderate strength and can used for general application in mechanical parts.
ASTM A108 1045 is a medium carbon steel with higher strength and hardness making it suitable for shafting, gears, and other heavy-duty machine parts.
Comparison Table of Mechanical Properties of ASTM A108 1045 Carbon Steel Bar
| Property | ASTM A108 1045 Carbon Steel Bar | Notes |
| Tensile Strength (Ultimate, MPa / ksi) | 585 – 700 MPa (85 – 101 ksi) | Higher than 1018, suitable for heavy-duty parts |
| Yield Strength (MPa / ksi) | 310 – 450 MPa (45 – 65 ksi) | Medium carbon steel, supports higher loads |
| Elongation (%) | 16 – 20% | Moderate ductility for machining and forming |
| Hardness (Brinell, HB) | 170 – 210 | Harder than low-carbon steels like 1018 |
| Rockwell Hardness (HRB) | 80 – 90 | Indicative of good wear resistance |
| Modulus of Elasticity (GPa) | ~210 GPa | Standard for carbon steels |
| Shear Strength (MPa) | ~370 – 420 | Suitable for shafts and load-bearing components |
Comments:
With higher tensile and yield strength than that of the ASTM A108 1018, 1045 is the application for maximum load, mechanical shaft, gears, and other related machinery parts.
Good balance of strength and machinability, can be heat treated for additional hardness.
Complete Specifications of ASTM A108 1045 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.
Click the Button on The Right
Our 1045 steel round bar is high strength and hardened for applications such as mechanical shafts and heavy industrial equipment. We are able to provide customized sizes in length, diameter and surface treatment to fit your exact project needs.
Main Features:
High Strength Carbon Steel 1045 offers better tensile and yield strength than 1018 and is used for shafts, gears and structural parts.
Good Durability: Work well under heavy load and wear-resistance.
Precision Machining and Finishing: Cold Drawn, Hot Rolled, Cast and Forged Finish Options available!
Custom size: Diameter, length, and tolerance can be customized according to your requirements.
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!
Q1 : What is size of ASTM A108 1045 round steel bar?
A: ASTM A108 1045 steel bar is a medium-carbon steel in round bar form that has more carbon than 1018 and as a result has a higher tensile strength, Increased hardness and more resistance to wear and tear. It is a good selection for rolling or forging if you want to avoid the hot forging temperatures of 1060 or 1080 while still being able to get the wear properties of a higher carbon steel in the end.
Q2: What is the chemical composition of ASTM A108 1045?
A: Typical composition (%):
Carbon (C): 0.43 – 0.50
Manganese (Mn): 0.60 – 0.90
Phosphorus (P): ≤ 0.040
Sulfur (S): ≤ 0.050
Silicon (Si): 0.10 – 0.35
Trace elements: Cr, Ni, Cu ≤ 0.25
Q3: What are the mechanical properties?
Tensile Strength: 585 – 700 MPa (85 – 101 ksi)
Yield Strength: 310 – 450 MPa (45 – 65 ksi)
Elongation: 16 – 20%
Brinell Hardness: 170 – 210 HB
Q4: What can it be used for?
shafts, gears and industrial machine parts
load bearing structures
heavy-duty automotive and mechanical components
Q5: Whether ASTM A108 1045 Round Bars can be customized?
A: Yes, we provide customized diameters,lengths,tolerances and surface finishes in either cold-drawn or hot-rolled.
Q6: How is it packaged and shipped?
Bundled or individually packed for protection
Anti-rust treatment for long-period storage
Transport via road, rail, or sea
Q7: How is ASTM A108 1045 better than 1018?1045: Medium carbon, stronger and harder good for heavy load applications
1018: Low carbon, easier to process with good strength for general mechanical parts
Q8: 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
