ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 HSLA Grade 55 — Hot Roll PO Steel

ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 is a hsla grade 55 grade hot roll po steel conforming to the astm standards. At 380 MPa minimum yield strength, this is high-strength steel for front-end structure components, rocker inners, and A-pillar reinforcements.

Class one requires tighter mechanical property tolerances with lower maximum yield variability, ensuring more predictable forming behavior in progressive die stamping operations.

The Class 1 designation indicates tighter mechanical property control with lower yield variability for precision stamping. Within the ASTM family, different class numbers reflect progressively different ductility and elongation requirements to suit varying stamping complexity.

ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 is a Low Alloy / HSLA steel at 380 MPa yield. Micro-alloying elements in ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 — typically niobium, vanadium, or titanium — provide grain refinement and precipitation strengthening, delivering structural-grade mechanical properties with good weldability and formability for automotive and industrial applications.

Ameristeel carries ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 across a range of gauges and widths in hot roll po form, available as coils, sheets, or custom-cut blanks. With 380 MPa minimum yield strength, this hsla grade 55 specification requires precise handling and testing — our ISO 9001:2015 certified processes include third-party laboratory verification on every incoming coil.

ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 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 380 MPa yield, the coating selection for ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 should account for forming severity and post-stamping corrosion exposure in the final application.

ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 at 380 MPa yield compares to ASTM A1008/A1008M GRADE 55 (380) CLASS 1 (0 MPa lower yield at 380 MPa) and ASTM A1008/A1008M GRADE 55 (380) CLASS 2 (0 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.

ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 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 ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 specifications with complete mill test reports and material certification.

Ameristeel offers in-house processing for ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 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, 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 ASTM A1011/A1011 HSLAS GR55 (380) CLASS 1 to your exact specifications.