# SAE 1008 steel

Low-carbon steel chemistry designation: product-form differences, supplier chemistry windows, strip tempers and qualification.

Reviewed: 2026-11-01

Tags: materials, steel, low-carbon-steel, sae

## Identity and specification

Brown Metals buys its **ASTM A109 cold-rolled 1008/1010 strip** to a **0.08–0.10% carbon** window. Its **October 2026** table uses **HR15T** from **0.010 to below 0.025 in**. The hardness basis is shipment, with possible increases during aging. [Brown Metals strip reference](https://www.brownmetals.com/technical-info/alloys/1008-1010-low-carbon-steel/)

SAE 1008 is a low-carbon steel chemistry designation. SAE's current public reference is **J403_202402, Chemical Compositions of SAE Carbon Steels**, stabilized February 23, 2024, with a June 2014 technical revision. SAE explains that its cast/heat composition ranges and product-analysis allowances are distinct; the latter are addressed by SAE J409. The designation alone does not establish a delivered tensile strength, hardness, product tolerance or heat-treatment condition. [SAE International, J403_202402](https://saemobilus.sae.org/standards/j403_202402-chemical-compositions-sae-carbon-steels)

SAE also states that the grades in J403 are SAE grades because AISI no longer issues steel grade designations. Commercial references may still use “AISI 1008”; preserve the ordered standard rather than treating the historical prefix as an additional certification. [SAE J403 scope](https://saemobilus.sae.org/standards/j403_202402-chemical-compositions-sae-carbon-steels)

## Chemistry: preserve the source context

Metallus' *Practical Data for Metallurgists*, **19th edition**, lists the following 1008 row in its standard-carbon-steel chemistry table:

| Element | Published mass-percent limit/range |
| --- | ---: |
| Carbon | 0.10 maximum |
| Manganese | 0.30–0.50 |
| Phosphorus | 0.040 maximum |
| Sulfur | 0.050 maximum |

This is a producer reference table, not a substitute for the complete chemistry and analysis rules on the actual order. [Metallus, standard carbon steels, page 4](https://metallus.com/wp-content/uploads/2024/01/Practical-Data-Guide-For-Metallurgists-Metallus-2024.pdf#page=1)

For comparison, ArcelorMittal's flat-products catalogue explicitly references **SAE J403:2009** and gives its 1008 product as C ≤0.100%, Mn ≤0.50%, P ≤0.030% and S ≤0.025%. Do not add a manganese minimum from one table to residual limits from another and call the result the universal 1008 specification. [ArcelorMittal, 1006/1008/1010 catalogue, chemistry](https://industry.arcelormittal.com/catalogue/B50/EN)

When assessing a certificate, first establish whether the reported result is heat analysis or product analysis and which edition/product provisions control acceptance. A number outside a simplified catalogue table should trigger review against the ordered standard, not an automatic rejection or silent acceptance.

## Product routes and supply

Nucor includes 1008 in its **hot-rolled special-bar-quality (SBQ)** grade program. Its product family includes rounds, squares, hexagons and flats, but actual size/grade availability requires supplier confirmation. That offering is evidence of a hot-rolled bar route, not an annealed-strip property specification. [Nucor, hot-rolled steel bar](https://nucor.com/products/hot-rolled-bar/)

ArcelorMittal separately markets its chemistry-defined 1006/1008/1010 flat products for deep drawing and construction applications, with a thickness-dependent dimensional catalogue. This is an application and availability description, not assurance that any part geometry can be drawn successfully. [ArcelorMittal, properties and dimensions](https://industry.arcelormittal.com/catalogue/B50/EN)

## Bounded cold-rolled strip example

Brown Metals supplies a **1008/1010 cold-rolled strip product to ASTM A109**, buying to a carbon window of **0.08–0.10%** to meet both grades. Its October 2026 reference gives these examples for the **0.010 to below 0.025 inch** thickness band:

| Temper | Published HR15T hardness |
| --- | ---: |
| No. 1 hard | 90 minimum |
| No. 2 half hard | 83.5–88.5 |
| No. 5 dead soft | 78.5 maximum |

The supplier qualifies hardness as applying at shipment and notes that aging may increase readings. Preserve scale and thickness; these HR15T values are not HRC values or properties of arbitrary 1008 stock. [Brown Metals, 1008/1010 strip data, revision 10/2026](https://www.brownmetals.com/technical-info/alloys/1008-1010-low-carbon-steel/)

For an **arithmetic-only illustration**, a 0.020-inch strip lies in that band because `0.010 ≤ 0.020 < 0.025`. A 0.025-inch strip belongs to the next band in the supplier's table. This boundary decision does not predict hardness, tensile strength or forming performance of a particular shipment.

## Condition, forming and joining

Metallus defines strain hardening as increased hardness and strength caused by plastic deformation below the recrystallization range. This helps explain why a chemistry designation needs a processing condition before a mechanical value can be used. [Metallus, metallurgical glossary](https://metallus.com/wp-content/uploads/2024/01/Practical-Data-Guide-For-Metallurgists-Metallus-2024.pdf#page=1)

For stamping or drawing, qualify representative stock thickness, temper, rolling direction, lubricant, tooling and edge condition. Specify the required forming quality rather than assuming low carbon alone guarantees deep-drawing behavior. Retain any intermediate annealing and final condition in the route. Treat a subsequent thermal cycle as a potential change to the condition that was originally tested.

For welding, use a procedure suited to actual chemistry, product thickness, restraint, coatings and service. Do not infer a universal preheat, filler or weld strength from the grade name. A raw-material certificate does not establish joint properties or the acceptance of a finished welded assembly.

Where surface hardening or a special heat treatment is proposed, define required case/core properties, depth, distortion allowance and qualification separately. Do not assign medium-carbon steel's quench-hardening behavior to 1008 merely because both are plain-carbon steels.

## Service and acceptance

Brown Metals warns that its low-carbon strip rusts in moisture/air and identifies protective finishes or rust-preventive oil as service considerations. A painted, plated or coated 1008 component therefore needs its own protective-system requirements. [Brown Metals, limitations](https://www.brownmetals.com/technical-info/alloys/1008-1010-low-carbon-steel/)

Specify exposure, surface preparation and coating separately.

An actionable purchase record includes chemistry/product standards and editions; form, dimensions and tolerance; supplied temper/condition; surface/edge requirements; inspection certificate and traceability. Distinguish specified limits, typical data and actual results. Approve substitutions against the complete requirement rather than similar carbon content alone.

## Source editions

SAE identifies J403 as stabilized in February 2024 and technically revised June 2014. Metallus' guide is the **19th edition, copyright 2024**. ArcelorMittal's catalogue cites J403:2009; Brown Metals marks its reference **Rev. 10/2026**. No printed revision date was verified for Nucor's web page. Confirm contract-required editions and current supply separately.

See also [grades, tempers and conditions](../grades-tempers-and-conditions.md).