Overview
A49 steel plate is a medium-thickness structural steel material classified under Japanese industrial standards (JIS G 3131). The 0.4-3.0mm thickness range makes it particularly suitable for applications requiring both strength and formability, such as automotive chassis components and building cladding. This hot-rolled steel product undergoes controlled rolling processes to achieve consistent mechanical properties across its thickness range. Its designation 'A49' refers to specific yield strength characteristics (typically 275-355 MPa), balancing durability with workability for fabrication processes like bending and punching.
Structure and Working Principle
A49 steel derives its structural integrity from a carefully controlled chemical composition (typically 0.25% max carbon, 0.04% phosphorus) and grain structure refinement during manufacturing. The rolling process aligns the ferrite-pearlite microstructure to optimize strength parallel to the rolling direction. At 0.4-1.2mm thicknesses, the material demonstrates exceptional formability for pressed components, while 1.5-3.0mm versions provide rigid structural support. The steel's performance relies on its consistent internal structure, with yield strength maintained through thickness variations to ensure predictable behavior under load.
Key Features
The material's 275 MPa minimum yield strength (for 3.0mm thickness) meets structural requirements while maintaining elongation properties of 23-27%. This combination allows deformation without fracture during fabrication processes. Surface quality complies with Class 1 standards (JIS G 3193), with controlled oxide scale formation for optimal paint adhesion. The steel's chemical composition also enables good weldability using common arc welding methods, with preheating generally unnecessary for thin gauges below 2.0mm thickness.
Application Areas
In construction, 1.5-3.0mm A49 serves as load-bearing panels for prefabricated structures and mezzanine flooring. The automotive industry utilizes 0.8-1.6mm thicknesses for door impact beams and seat brackets where high energy absorption is required. Industrial applications include conveyor system frames (2.0-3.0mm) and agricultural equipment housings (1.2-2.3mm). The material's consistent mechanical properties make it suitable for CNC machining into precision components, particularly in the 0.4-1.0mm range for electrical enclosures and control boxes.
Maintenance and Precautions
Storage should prevent water accumulation between plates - ideally stacked on wooden pallets with desiccant packets in humid environments. For outdoor storage exceeding 30 days, temporary protective coatings are recommended. Fabrication requires tooling designed for high-strength steel to prevent premature wear. Shear clearance should be 5-7% of material thickness during cutting. When welding, use low-hydrogen electrodes (E7018) for thicknesses above 1.5mm to minimize hydrogen-induced cracking risk.
B2B Procurement Guide
Verify mill test certificates for each batch, checking yield strength elongation values match JIS G 3131 requirements. For precision applications, specify thickness tolerance (typically ±0.15mm for commercial grade). Leading manufacturers include Nippon Steel, POSCO, and domestic mills with JIS certification. Consider ordering pre-cut blanks (slit-to-width) to reduce processing costs. Spot-check first articles for surface defects using ASTM A568 inspection standards, particularly for visible applications like architectural cladding.
Related Manufacturers
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