Carbon & alloy steel
AISI 1045
Manufacturer or standards-body identification; product values do not apply to every form or condition.
Identity / state reference
What distinguishes this material
The Metallus 1045 chemistry row specifies carbon 0.43–0.50% and manganese 0.60–0.90% by mass. These identify the grade band; they are not a tensile-strength or hardness guarantee.
- Designation in this reference
- SAE 1045
- Forms covered by the sources
- Nucor lists this grade in its hot-rolled SBQ bar programme.
- Nucor lists cold-finished bar products for this grade; exact shapes depend on its grade/shape table.
- States to distinguish or confirm
- The chemistry designation does not establish a heat-treatment condition.
- Hot-rolled product route; confirm subsequent heat treatment on the order.
- Cold-finished is a product route, not proof of a particular final hardness.
- Temperature and exposure
- No universal service-temperature limit or room-temperature property set is assigned. Use the cited product document and the purchase certificate.
Property evidence for a stated condition
No condition-specific numerical table is reproduced here
The linked sources establish the identity and the stated product/state scope. Obtain the row for your actual form, section, treatment and test conditions before adopting strength, hardness or a thermal limit.
Metallus Practical Data for Metallurgists, 19th edition (2024) ↗
Resolve these conditions next
- What product standard, edition and complete grade are on the material certificate?
- What product form, section size and delivery/heat-treatment condition will be machined?
For machining, take the exact grade, supplied condition and measured hardness where applicable into the tool maker’s application data. A generic material-family speed is not a substitute for an operation and tool-specific recommendation.
Sources and what they establish
Reviewed 23 October 2026. A source’s publication date and the review date are different. The scope below identifies the fields checked.
Metallus Practical Data for Metallurgists, 19th edition (2024)
Grade chemistry tables, printed pp. 4–7, visually checked; supports chemistry identity, not a universal mechanical-property or delivery-condition table.
Metallus Practical Data for Metallurgists, 19th edition (2024) ↗Nucor hot-rolled bar product programme
Exact listed SBQ grades and available hot-rolled product route; not heat-treated mechanical guarantees.
Nucor hot-rolled bar product programme ↗Nucor cold-finished bar product programme
Grade-specific round, hexagon, square and flat listings; distinguishes 1144 SR and 4140 annealed listings.
Nucor cold-finished bar product programme ↗Source identity, a named product example and a supplied-batch certificate are different evidence. Cross-standard similarity does not approve substitution.
Corrections from the previous article
- Replace unqualified international equivalents with certificate-based comparisons; the reviewed chemistry source does not certify interchangeability.
- Withdraw the legacy generic hardness (170–210 HB) and tensile-strength (585 MPa (85 ksi)) pair: the old page does not establish a matching product, heat treatment, section and test source.
- Remove the unsupported cutting-speed table and machinability percentage; select tooling only after the actual material condition is known.