What is equivalent to 1018 steel?

1018 Steel is equivalent to A36 Steel in many applications. Both are used for high-performance tasks, though 1018 is typically cold-rolled and A36 is hot-rolled. International equivalents include BS 970 708A30, JIS SCM 420/430, and EN 1.7218.

What is the composition of 1018 steel?

1018 steel contains 0.15–0.20% carbon, 0.60–0.90% manganese, max 0.030% phosphorus, max 0.035% sulphur, and iron (balance). It may also include trace amounts of chromium (max 0.150%), copper (max 0.200%), nickel (max 0.200%), and molybdenum (max 0.060%).

SAE 1018 Steel – Chemical Composition, AISI Properties, Equivalent Grades & Uses

Q: What is SAE 1018 steel?

SAE 1018 steel is a mild/low carbon steel known for its excellent weldability and ease of fabrication. It is often used for carburized parts due to its ability to produce a uniform, harder case while maintaining a tough core.

Q: What is the tensile strength of SAE 1018 steel?

SAE/AISI 1018 steel has a tensile strength of 440 MPa (63,800 psi) and a yield strength of 370 MPa (53,700 psi) in the cold-drawn condition. Elongation at break is 15% and Brinell hardness is 126 HB.

Q: Can SAE 1018 steel be hardened?

SAE 1018 cannot be through-hardened due to its low carbon content. However, surface hardening via carburizing is very effective — it creates a hard, wear-resistant outer case while maintaining a tough, ductile core, making it ideal for gears, pins, and bushings.

Q: What are the main applications of SAE 1018 steel?

SAE 1018 steel is widely used in oil and gas pipelines, chemical processing, heat exchangers, structural pipe, food processing equipment, water supply systems, power plants, and general fabrication. It is also common in automotive components, machinery parts, fasteners, and carburized parts like gears and pins.

SAE 1018 mild carbon steel has very good weldability and is a versatile material for fabrication. It is suitable for carburizing, and can be used to make parts with uniform and hard surface. AISI 1018 is a very common material due to its high ductility, strength and toughness. It has strong mechanical properties in the hot-rolled state, which can be used in many aspects. It also has good machining characteristics, which is ideal for projects requiring precise work. Moreover, SAE 1018 has a high Brinell hardness, which makes the material hard and effective for use in applications when hardness is required. In summary, AISI 1018 is a reliable mild carbon steel that provides a good balance of properties for various industrial applications. Get top-quality pipes and tubes from Solitaire Overseas.

SAE 1018 Chemical Composition

Chemical Composition
Carbon	C %	0.150–0.200
Manganese	Mn %	0.600–0.900
Phosphorus	P %	0.030 max.
Sulphur	S %	0.035 max.
Boron	B %	0.0005–0.003
Chromium	Cr %	0.150 max.
Copper	Cu %	0.200 max.
Molybdenum	Mo %	0.060 max.
Nickel	Ni %	0.200 max.
Lead	Pb %	0.150–0.350
Iron	Fe %	Balance

SAE 1018 Chemical Properties

SAE 1018 is a low-carbon steel with around 0.6% to 0.9% manganese and small amounts of other elements. This composition makes it ideal for a variety of automotive and machinery uses. In its cold-drawn or polished form, AISI 1018 offers higher yield and tensile strength compared to hot-rolled or regular AISI 1010 steel. The steel’s chemical properties also give it excellent weldability, allowing for strong and reliable welds in different applications. Its versatility makes SAE 1018 suitable for many industrial uses, from construction machinery to small parts like screws and nuts. Overall, AISI 1018 is a dependable choice for creating tools and equipment due to its balanced and effective chemical composition.

Mechanical Properties of SAE/AISI 1018 Steel

SAE/AISI 1018 steel is known for its balanced mechanical properties. It has a tensile strength between 380 MPa and 540 MPa, and a yield strength ranging from 310 MPa to 420 MPa. The steel also features an elongation at break of about 21–23%, which indicates good ductility. The hardness of SAE/AISI 1018 can be adjusted through heat treatment processes, allowing customization for different applications. These properties make AISI 1018 a versatile steel choice for many industrial uses, where both strength and flexibility are required.

Mechanical Property	Metric	Imperial
Hardness, Brinell	126	126
Hardness, Knoop (Converted from Brinell)	145	145
Hardness, Rockwell B (Converted from Brinell)	71	71
Hardness, Vickers (Converted from Brinell)	131	131
Tensile Strength, Ultimate	440 MPa	63,800 psi
Tensile Strength, Yield	370 MPa	53,700 psi
Elongation at Break (In 50 mm)	15.0%	15.0%
Reduction of Area	40.0%	40.0%
Modulus of Elasticity	205 GPa	29,700 ksi
Bulk Modulus	140 GPa	20,300 ksi
Poisson’s Ratio	0.290	0.290
Machinability (vs AISI 1212 = 100%)	70%	70%
Shear Modulus	80.0 GPa	11,600 ksi

Physical Properties of SAE/AISI 1018 Steel

SAE/AISI 1018 is a versatile low-carbon steel known for its excellent physical properties, making it a popular choice in many industries. Its machinability is top-notch, allowing for easy fabrication and shaping. The steel’s cold-forming ability offers flexibility in manufacturing processes. With a yield strength of 393 MPa, AISI 1018 provides reliable strength for structural applications. It also exhibits durability and weldability, which are crucial for a wide range of uses. The steel’s good ductility ensures it can handle deformation without breaking, while its wear resistance supports applications subject to abrasion. AISI 1018’s high thermal conductivity supports efficient heat treatment, and its low thermal expansion rate ensures stability across different temperatures. These physical properties make SAE/AISI 1018 a dependable choice for various engineering and manufacturing needs.

Physical Property	Metric	Imperial
Density	7.87 g/cc	0.284 lb/in³
Thermal Conductivity	51.9 W/m·K	~30 BTU/hr·ft·°F
Melting Point (approx.)	1426–1538°C	2600–2800°F
Coefficient of Thermal Expansion	11.7 µm/m·°C	6.5 µin/in·°F

SAE 1018 Equivalent Grades

Standard	AISI / SAE 1018 Equivalent
UNS	G10180
WERKSTOFF NR.	25CrMo4, GS-25CrMo4
BS 970	708A30, CDS110
UNI	25CrMo4 (KB), 30CrMo4
JIS	SCM 420, SCM 430, SCCrM1
EN name	—
EN #	1.7218
ASTM	A108 (Cold-Finished Carbon Steel Bars)

SAE 1018 Cold-Rolled vs Hot-Rolled Steel

SAE 1018 steel is available in two primary production forms like cold-drawn (cold-rolled) and hot-rolled, each suited to different industrial requirements. Understanding the difference helps engineers and procurement teams select the right form for their application.

Property	1018 Cold-Drawn / Cold-Rolled	1018 Hot-Rolled
Surface Finish	Smooth, bright, scale-free	Rough, with mill scale
Dimensional Tolerance	Tight (precision applications)	Looser (bulk fabrication)
Tensile Strength	~440–490 MPa	~380–440 MPa
Yield Strength	~370–420 MPa	~310–380 MPa
Ductility	Slightly lower	Higher
Machinability	Better (harder surface, consistent)	Good
Typical Use	Shafts, pins, bushings, precision parts	Structural frames, plates, heavy fabrication
Cost	Higher	Lower

For tubes and pipes in process industries, the cold-drawn form is preferred for heat exchangers and boiler applications due to tighter OD/ID tolerances. For structural and general piping, hot-rolled 1018 provides a cost-effective solution.

SAE 1018 vs A36 Steel Key Differences

A frequently asked question is whether SAE 1018 and ASTM A36 can be used interchangeably. While both are low-carbon steels with good weldability, there are key practical differences:

Parameter	SAE 1018	ASTM A36
Carbon Content	0.15–0.20%	Up to 0.26%
Manufacturing Form	Cold-drawn bars (primarily)	Hot-rolled plates, beams, angles
Surface Finish	Smooth, bright, precise	Rough (mill scale)
Tensile Strength	440 MPa (64,000 psi)	400–550 MPa (58,000–80,000 psi)
Yield Strength	370 MPa	250 MPa minimum
Machinability	70% (better)	Lower
Primary Use	Precision machined parts, shafts, pins	Structural steel — beams, bridges, buildings
Cost	Higher per unit	Lower (bulk structural supply)
Standard Body	AISI / SAE	ASTM

SAE 1018 Steel Corrosion Resistance

SAE/AISI 1018 steel is a good choice for applications that require moderate corrosion resistance. As a low-carbon steel, it offers a balanced combination of strength and flexibility without the surface issues found in higher carbon steels. Its weldability further adds to its versatility, making it suitable for various manufacturing processes.

Compared to higher-strength alloys, SAE 1018 is also more cost-effective, which makes it an appealing option for projects with budget constraints. While it provides decent corrosion resistance, it is best used in environments where severe corrosion is not a major concern. Overall, the mix of corrosion resistance, weldability, and affordability makes SAE 1018 a practical choice for many engineering and manufacturing applications.

SAE 1018 Grade Application

Oil and Gas Pipeline
Chemical Industry
Plumbing
Heating
Oil & Gas Industry
Water Supply Systems
Paper & Pulp Industry
Power Plant
Fabrication Industry
General Purpose Applications
Food Processing Industry
Structural Pipe
Heat Exchangers

Heat Treatment of SAE/AISI 1018 Steel

SAE/AISI 1018 steel undergoes a structured heat treatment process to achieve different material properties.

Annealing involves heating the steel to 870–900°C and then slowly cooling it, which refines the grain structure for improved ductility and softness.
Normalizing heats the steel to 860–890°C followed by air cooling, which adjusts the microstructure for better mechanical properties and uniformity.
Stress Relieving heats the steel to 580–650°C to release internal stresses, which helps prevent future deformation.
Hardening is done by quenching the steel in oil or water for increased hardness, followed by Tempering at 170–230°C to balance hardness with toughness.

This heat treatment sequence enhances the steel’s mechanical properties, making it suitable for various industrial applications.

Machining SAE/AISI 1018 Steel

Machining SAE/AISI 1018 steel is relatively simple because of its low carbon content and favorable machining characteristics. This steel is composed mainly of iron with small additions of manganese, phosphorus, sulfur, and silicon, making it easy to work with for various machining tasks.

To achieve the best results, it is important to use high-speed cutting tools that are hard enough for the job, as this will improve tool longevity and efficiency. Common machining processes include turning, drilling, boring, milling, and tapping.

Since SAE/AISI 1018 does not have heat-treatable alloying elements, heat treatment is not recommended for this steel. Instead, focusing on proper tool selection and machining techniques is vital for producing high-quality parts. Following these practices will help ensure successful and efficient machining of SAE/AISI 1018 steel for diverse industrial needs.

Welding SAE/AISI 1018 Carbon Steel

Welding SAE/AISI 1018 carbon steel is a practical and budget-friendly choice for many applications. This low-carbon steel is known for its strength and durability, making it suitable for a wide range of welding jobs. It is especially effective for both large construction projects and smaller everyday tasks due to its cost-effectiveness and reliable performance.

SAE/AISI 1018’s low carbon content makes it easy to weld, providing good results in various applications. Its strong and tough properties make it a great option for industries like automotive and construction. Whether you’re working on a major project or just doing some routine welding, SAE/AISI 1018 offers the versatility and dependability you need.

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The Bottom Line

SAE/AISI 1018 steel offers a range of benefits that make it a great material for many applications. Whether you’re working on automotive components, machinery, or everyday items, this steel’s strength and formability make it a top choice. Its ease of machining adds to its appeal, making it practical for a variety of projects.

This guide has covered the essential details about SAE/AISI 1018 steel, helping you understand why it’s a reliable and versatile option. With its broad uses and beneficial properties, SAE/AISI 1018 steel is a solid choice for your next industrial project.

FAQs

What is SAE 1018 steel?

SAE 1018 steel is a low-carbon (mild) steel containing approximately 0.15–0.20% carbon. It is widely valued for its excellent weldability, machinability, ductility, and ease of fabrication. Because of its low carbon content, it is easy to form and machine while maintaining good strength. SAE 1018 is also an excellent choice for carburizing, allowing a hard wear-resistant surface to be developed while retaining a tough and ductile core.

What is the equivalent of SAE 1018 steel?

SAE/AISI 1018 steel is commonly compared with ASTM A36 because both are low-carbon steels used in structural and engineering applications. However, they are not exact equivalents. SAE 1018 is typically supplied as cold-drawn steel with tighter dimensional tolerances, better surface finish, and higher strength, while ASTM A36 is generally supplied as hot-rolled structural steel intended primarily for construction and structural fabrication.

What is the chemical composition of SAE 1018 steel?

SAE 1018 steel typically contains 0.15–0.20% Carbon (C), 0.60–0.90% Manganese (Mn), with small amounts of phosphorus and sulphur as residual elements. This balanced chemical composition provides an excellent combination of machinability, weldability, moderate strength, and good response to carburizing.

What is the tensile strength of SAE 1018 steel?

In the cold-drawn condition, SAE/AISI 1018 steel typically has an ultimate tensile strength of approximately 440 MPa (63,800 psi), a yield strength of around 370 MPa (53,700 psi), and a Brinell hardness of approximately 126 HB. These mechanical properties make it suitable for shafts, pins, fasteners, and precision-machined components requiring reliable strength and good machinability.

Can SAE 1018 steel be hardened?

SAE 1018 steel cannot be effectively through-hardened because its low carbon content does not allow significant hardness throughout the entire cross-section. However, it responds very well to carburizing (case hardening), where carbon is introduced into the surface before heat treatment. This produces a hard, wear-resistant outer layer while maintaining a strong and ductile core, making it ideal for gears, bushings, pins, shafts, and other wear-resistant components.

What are the main applications of SAE 1018 steel?

SAE 1018 steel is extensively used across industrial and engineering sectors because of its excellent fabrication characteristics and cost-effectiveness. Common applications include automotive components, shafts, pins, bushings, gears, machine parts, fasteners, structural fabrications, hydraulic fittings, conveyor systems, oil and gas equipment, heat exchangers, water supply systems, food processing machinery, and carburized components requiring a hard surface with a tough core.

SAE 1018 Steel – Chemical Composition, Equivalent Material, Properties and Uses