SAE 1008 steel

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

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

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

Chemistry: preserve the source context

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

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

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

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

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

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:

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

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

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

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.