SAE J2340 300X HSLA 40 — COLD ROLLED / HOT ROLLED Steel

SAE J2340 300X is a hsla 40 grade cold rolled / hot rolled steel conforming to the sae standards. At 300 MPa minimum yield strength, this is intermediate-strength steel for structural cross-members, seat mounting brackets, and suspension component interfaces.

The X suffix denotes solution-hardened (micro-alloyed) HSLA steel with niobium, vanadium, or titanium additions for grain refinement and precipitation strengthening.

Ameristeel maintains a deep inventory of SAE J2340 300X in standard and custom gauges, available as coils, slit coils, sheets, or precision blanks. As a cold rolled / hot rolled product, SAE J2340 300X offers the tight thickness tolerances and controlled surface finish critical for visible and semi-exposed automotive applications. Every coil is third-party tested under our ISO 9001:2015 quality system.

SAE J2340 300X is supplied with the following coating options: hot-dip galvanized (zinc) for general corrosion resistance; galvanneal (zinc-iron alloy) for superior paint adhesion and weldability; electrogalvanized for precise coating weight control and smooth surface finish. At 300 MPa yield, the coating selection for SAE J2340 300X should account for forming severity and post-stamping corrosion exposure in the final application.

SAE J2340 300X at 300 MPa yield compares to SAE J2340 340X (40 MPa lower yield at 340 MPa) and SAE J2340 380X (80 MPa lower yield at 380 MPa). Selecting the right grade depends on the balance between strength requirements and forming complexity for your specific stamping application.

SAE J2340 300X is widely used across structural construction, heavy equipment manufacturing, pressure vessel fabrication, bridge and infrastructure components, and automotive chassis applications. Ameristeel sources and stocks this grade at our Fraser, MI steel processing center, with the ability to supply production quantities, prototype runs, and custom-processed orders. Whether you need full coils, slit-to-width coils, cut-to-length sheets, or precision blanks, our team can fulfill orders to SAE J2340 300X specifications with complete mill test reports and material certification.

Ameristeel offers in-house processing for SAE J2340 300X at our Warren and Fraser, Michigan facilities. Available processing capabilities include precision slitting to custom widths on our multi-cut blanking line, cut-to-length sheet processing for exact dimensional requirements, laser cutting of high-strength profiles on our TRUMPF fiber laser with up to 4kW power, press brake forming on our TruBend series with up to 110-ton capacity and 120" bend length, shear processing for rapid sheet production. From raw material sourcing through finished part delivery, Ameristeel provides a single-source solution — eliminating the need to coordinate between separate steel suppliers, service centers, and fabrication shops. Learn more about our laser cutting capabilities, production steel sales, or request a quote for processing SAE J2340 300X to your exact specifications.