What Standards Should You Know About AISI 1045?

If you're sourcing or working with AISI 1045 steel plate, understanding the relevant standards is essential for ensuring quality, compatibility, and compliance—especially for export and international projects.

AISI 1045 is a medium carbon steel defined by the American Iron and Steel Institute (AISI). However, several international and regional standards also cover this grade, depending on the form and application.

Here are the key standards to watch:

1. ASTM A830 / A830M
This specification covers structural-quality carbon steel plates, including 1045. It outlines mechanical properties, chemical composition, and dimensional tolerances.

2. JIS S45C (Japan)
JIS S45C is the Japanese equivalent of AISI 1045 and is commonly accepted in Asian markets. Be sure to confirm dimensional and testing differences if substituting.

3. EN 10083-2 C45 (Europe)
In the European market, 1045 is commonly referred to as C45, specified under EN 10083-2. This standard focuses on heat-treated steels, so mechanical properties may differ slightly from ASTM specs.

4. ISO Certification & Mill Test Reports (MTRs)
Most international buyers expect ISO 9001-certified mills and complete MTRs that follow EN 10204 3.1 or 3.2 standards for traceability.

Understanding these standards ensures your 1045 steel meets project specs and passes inspection—especially in international trade or custom machining.