JAH400W Low Carbon — Hot Rolled Steel

JAH400W is a low carbon grade hot rolled steel conforming to the other international standards. JAH400W is a hot rolled product with a base tensile strength of 400 MPa. The "W" suffix designates structural quality with 400 MPa minimum yield strength for load-bearing applications, defining specific elongation and mechanical property requirements under the JIS G 3302 / G 3313 family.

Ameristeel stocks JAH400W in a range of thicknesses and widths for structural and forming applications. As a hot rolled product, this specification is supplied in coils, cut sheets, or blanked parts. Our dedicated purchasing team sources JAH400W through direct mill relationships, and every incoming coil is third-party tested under our ISO 9001:2015 quality management system.

JAH400W is supplied with the following coating options: galvanneal (zinc-iron alloy) for superior paint adhesion and weldability. The right coating choice for JAH400W depends on your forming process, paint system, and end-use corrosion environment.

JAH400W is listed alongside JAH370W and JAH440W within this specification family. As a low carbon designation, JAH400W addresses specific hot rolled forming requirements that distinguish it from adjacent grades in ductility, surface quality, and mechanical property control.

JAH400W is widely used across structural steel fabrication, trailer and chassis manufacturing, agricultural equipment, and heavy-duty industrial 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 JAH400W specifications with complete mill test reports and material certification.

Ameristeel offers in-house processing for JAH400W 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 for complex profiles and prototypes on our TRUMPF fiber laser systems, 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 JAH400W to your exact specifications.