Introduction

1018 Carbon Steel Bar is a low-carbon structural steel bar manufactured according to ASTM A29 / A108 and SAE 1018 standards. It is mainly used in the manufacture of mechanical parts that have comprehensive requirements for strength and machinability, including shafts, connectors and general-purpose machined parts.

Specification

Item			Details
Product Name			1018 Carbon Steel Bar
Standard			ASTM A29 / A108, SAE 1018
Material Grade			1018 Low Carbon Steel
Shapes			Round Bar, Square Bar, Flat Bar, Hexagonal Bar
Manufacturing Process			Hot Rolled / Cold Drawn
Surface Finish			Black, Bright, Polished, Ground, Galvanized, Oiled
Shape		Size Range						Length
Round Bar		Ø10 – Ø300 mm						6m – 12m
Square Bar		10×10 – 250×250 mm						6m – 12m
Flat Bar		Thickness: 5 – 50 mm Width: 20 – 300 mm						6m – 12m
Hexagonal Bar		AF 10 – AF 80 mm						6m – 12m
Property				Value
Yield Strength				≥ 370 MPa
Tensile Strength				440 – 540 MPa
Elongation				≥ 15%
Hardness				126 – 163 HB
Modulus of Elasticity				205 GPa
Element	C				Mn	P(max)	S(max)		Fe
1018 Carbon Steel Bar	0.15–0.20				0.60–0.90	0.040	0.050		Balance

Features

Facilitates Machining and Forming

With a carbon content of 0.15–0.20%, it reduces cutting forces and tool wear during machining, while also reducing cracking tendency during cold bending or stamping.

High Elongation Capacity

Yield strength ≥370 MPa, tensile strength 440–540 MPa, and elongation ≥15%, providing a certain degree of plastic deformation capacity while bearing load to prevent brittle fracture.

Multiple Cross-Section Forms

Suitable for round, square, flat, and hexagonal bars (e.g., Ø10–300 mm, AF10–80 mm, etc.), allowing for adjustments to reduce subsequent machining material removal based on part geometry.

Applications

Mechanical processing industry

Used in the manufacture of shafts, pins, and connectors, serving transmission or connection functions during equipment operation.

Automotive parts industry

Used in brackets, fasteners, and structural connectors, transmitting loads and maintaining structural integrity in assembly systems.

General manufacturing industry

Used in the processing of various standard and non-standard parts, serving as a base material in the production of various components.

Engineering structure industry

Used in lightly loaded structural components and auxiliary support parts, bearing localized stresses within the overall structure.

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FAQ

Q: How to choose between 1018 and higher carbon steel?

A: 1018 can be chosen when the part's machinability and plasticity are the primary considerations. If higher hardness or wear resistance is required, materials with higher carbon content or subsequent heat treatment should be considered.

Q: Is the material suitable for surface hardening treatment?

A: 1018 can undergo carburizing treatment to achieve higher surface hardness by increasing the surface carbon content while maintaining core toughness.

Q: How to choose between hot-rolled and cold-drawn states?

A: Cold-drawn state is preferred when dimensional accuracy and surface quality are required; hot-rolled state is preferred when cost or large subsequent machining allowances are the primary considerations.

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1018 Carbon Steel Bar

Introduction

Specification

Features

Applications

Our certificates

FAQ

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