SAE 1018 Carbon Steel

Primary Designation:SAE 1018

Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification, ASTM/CDA endorsement, or guaranteed material conformity for procurement.

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Data Completeness & Record Integrity:4 composition elements and 16 contextual property values cataloged.

Omitted fields represent unverified parameters. "Missing is better than invented."

Key Engineering Properties

Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.

Density

7.87 g/cm³TYPICAL · temperature not stated

Thermal Conductivity

51.9 W/(m·K)TYPICAL · at 100 °C

Specific Heat Capacity

486 J/(kg·K)TYPICAL · temperature not stated

Composition Excerpt

C 0.15–0.2 wt%Carbon (range)

Standard Elemental Basis: RANGE

Engineering Summary

SAE 1018 Carbon Steel. Source-scoped engineering data is shown with its reported limits and conditions. Unreported properties are not inferred.

Recognized Aliases

Source-backed commercial trade name and short designations cataloged in canonical data.

Standard Designations & Applicable Specifications

Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.

Direct Standard DesignationsDIRECT DESIGNATION

2 Primary Identifiers

System	Identifier	Standard System Name	Classification Notes & Provenance
SAEPRIMARY	1018	SAE	—Ref: Practical Data for Metallurgists, 19th edition
AISI	1018	AISI	—Ref: Practical Data for Metallurgists, 19th edition

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

1 Applicable Standards

Standards Body	Specification Code	Specification Title / Scope	Relationship Type
SAE	SAE 1018 Carbon Steel Engineering Datasheet	Applicable specification reference.	Specification Reference

Engineering Notice: Applicable specifications establish manufacturing requirements, dimensional tolerances, and test criteria for specific product forms (e.g. bus bar, wire, plate, pipe). They represent applicable technical standards, not alternative or equivalent alloy grades.

Chemical Composition (Weight %)

Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).

Element	Symbol	Atomic No.	Semantic Basis	Specified Value	Unit	Metallurgical Notes & Qualification	Data Status
Carbon	C	6	RANGE	0.15 – 0.20	wt%	Source cell: .15/.20. Scope: p4, SAE 1018.Ref: Metallus	VERIFIED
Manganese	Mn	25	RANGE	0.60 – 0.90	wt%	Source cell: .60/.90. Scope: p4, SAE 1018.Ref: Metallus	VERIFIED
Phosphorus	P	15	MAXIMUM	≤ 0.04	wt%	Source cell: .040max. Scope: p4, SAE 1018.Ref: Metallus	VERIFIED
Sulfur	S	16	MAXIMUM	≤ 0.05	wt%	Source cell: .050max. Scope: p4, SAE 1018.Ref: Metallus	VERIFIED

* Elemental percentages are expressed in weight percent (wt%). Values represent applicable specification limits. Unspecified trace elements are not fabricated or assumed.Preserves exact semantic basis

Property Display UnitsSwitch between Canonical SI and Source / US Customary units:

Physical Properties

Source-specific physical properties. Test temperatures are shown only where reported.

3 Parameters

Property Parameter	Canonical SI Value	Semantic Basis	Source Raw Reference	Source Reference	Status
Density	7.87 g/cm³	TYPICAL	7.87 g/cm3	Metallus	VERIFIED
Elastic Modulus	205 GPa	TYPICAL	205 GPa	Metallus	VERIFIED
Poisson's Ratio	0.29 dimensionless	TYPICAL	0.29 dimensionless	Metallus	VERIFIED

Thermal & Thermodynamic Properties

Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.

3 Parameters

Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Specific Heat Capacity	486 J/(kg·K)	TYPICAL		486 J/(kg·K)	Metallus	VERIFIED
Coefficient of Thermal Expansion	11.7 µm/(m·K)	TYPICAL	Test Temp: 100 °C	11.7 10^-6/K	Metallus	VERIFIED
Thermal Conductivity	51.9 W/(m·K)	TYPICAL	Test Temp: 100 °C	51.9 W/(m·K)	Metallus	VERIFIED

Contextual Mechanical Properties & Tempers

Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.

Temper / Condition:

Showing 5 of 5 conditions

Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Bar	Hot rolled (estimated minimum) Source values and qualifiers Tensile Strength: ≥ 399.9 MPa (MINIMUM)Producer estimated minimum, not a certified or guaranteed specification limit. Section size and test temperature are not stated.Metallus — p118, SAE and AISI 1018 Yield Strength: ≥ 220.6 MPa (MINIMUM)Producer estimated minimum, not a certified or guaranteed specification limit. Section size and test temperature are not stated.Metallus — p118, SAE and AISI 1018 Elongation: ≥ 25 % (MINIMUM)Producer estimated minimum, not a certified or guaranteed specification limit. Section size and test temperature are not stated. Elongation gauge length: 2 in.Metallus — p118, SAE and AISI 1018 Reduction Of Area: ≥ 50 % (MINIMUM)Producer estimated minimum, not a certified or guaranteed specification limit. Section size and test temperature are not stated.Metallus — p118, SAE and AISI 1018 HB Hardness: ≥ 116 HB (MINIMUM)Producer estimated minimum, not a certified or guaranteed specification limit. Section size and test temperature are not stated.Metallus — p118, SAE and AISI 1018	—	≥ 399.9 MPa	≥ 220.6 MPa	≥ 25 %	—	—	≥ 116 HB	VERIFIED
Bar	Cold Drawn Bar · Cold Drawn Source values and qualifiers Ultimate Tensile Strength: ≥ 440 MPa (MINIMUM)ASTM A108Metallus — p119, Estimated Minimum Mechanical Properties of Cold-Drawn Carbon Steel Bars, SAE 1018 Reduction of Area: ≥ 40 % (MINIMUM)ASTM A108Metallus — p119, Estimated Minimum Mechanical Properties of Cold-Drawn Carbon Steel Bars, SAE 1018	— · 19 to 32 mm (3/4 to 1-1/4 in)	≥ 440 MPa	—	—	—	—	—	VERIFIED
Bar	Cold Drawn Bar · Cold Drawn Source values and qualifiers Yield Strength: ≥ 370 MPa (MINIMUM)ASTM A108 (0.2% offset)Metallus — p119, Estimated Minimum Mechanical Properties of Cold-Drawn Carbon Steel Bars, SAE 1018	— · 19 to 32 mm (3/4 to 1-1/4 in)	—	≥ 370 MPa	—	—	—	—	VERIFIED
Bar	Cold Drawn Bar · Cold Drawn Source values and qualifiers Elongation at Break: ≥ 15 % (MINIMUM)ASTM A108Metallus — p119, Estimated Minimum Mechanical Properties of Cold-Drawn Carbon Steel Bars, SAE 1018	— · in 50 mm (2 in)	—	—	≥ 15 %	—	—	—	VERIFIED
Bar	Cold Drawn Bar Source values and qualifiers HB Hardness: ≥ 126 HB (MINIMUM)Metallus — p119, Estimated Minimum Mechanical Properties of Cold-Drawn Carbon Steel Bars, SAE 1018	—	—	—	—	—	—	≥ 126 HB	VERIFIED

Hardness Integrity Notice: Rockwell B (HRB), Rockwell F (HRF), and Superficial 30T (HR30T) scales are reported on their measured scales without cross-scale mathematical conversion.

Source: See fact-level citations