What does DX51D+Z100 steel strip mean?
DX51D+Z100 is a common designation for hot-dip galvanized steel strip. "DX51D" is the base plate designation, "D" represents cold-forming flat steel, and its core application is to meet cold forming requirements. "X" indicates that the base plate's rolling process is not specified, allowing manufacturers to select the appropriate rolling method based on process optimization. "51" is the steel grade serial number, corresponding to a specific range of mechanical properties. "Z100" represents the pure zinc coating type, "Z" is the designation for the pure zinc coating, and "100" indicates a minimum zinc coating weight of 100g per square meter of the steel strip (on both sides combined). This coating weight is a key indicator of the steel strip's corrosion resistance.
What are the standards for DX51D+Z100 steel strip?
Currently, the industry primarily adheres to international standards, advanced international standards, and relevant domestic standards. International and foreign standards include Europe's EN 10142 (hot-dip galvanized flat steel products for cold forming), EN 10147 (continuously hot-dip galvanized mild steel flat products), EN 10292 (hot-dip galvanized steel sheets for structural purposes), Japan's JIS G3302 (hot-dip galvanized steel sheets and strips), and the US's ASTM A653/A653M (hot-dip galvanized structural steel sheets). Domestic standards include BQB 420 (Baosteel's corporate standard, applicable to internal production and quality inspection). These standards clearly define key indicators of steel strip, including chemical composition, mechanical properties, and coating quality.
What is the chemical composition of DX51D+Z100 steel strip?
Its chemical composition strictly adheres to relevant implementation standards, with the core element contents controlled as follows: Carbon (C) ≤ 0.18%. A low carbon content ensures good weldability and cold forming properties of the steel strip, avoiding cracking during processing due to excessive carbon content. Silicon (Si) ≤ 0.50%. Silicon improves the strength of the steel strip, but excessive amounts can affect the adhesion of the galvanized coating, so the upper limit must be strictly controlled. Manganese (Mn) ≤ 1.20%. Manganese can increase the tensile strength of the steel strip through solid solution strengthening without significantly reducing its plasticity. Phosphorus (P) ≤ 0.12%, and sulfur (S) ≤ 0.045%. Phosphorus and sulfur are harmful impurities. Excessive amounts can cause cold and hot brittleness in the steel strip, affecting processing and safety, so their contents must be strictly limited.
What are the mechanical properties of DX51D+Z100 steel strip?
Mechanical properties vary by steel grade. CQ grade (common commercial grade) has a tensile strength of 270-500 MPa and a yield strength of 140-300 MPa. DQ grade (deep drawing grade) has a similar tensile strength to CQ grade, but a more stable yield strength and better formability. In terms of elongation, CQ grade steel strip has an elongation of ≥22% for thicknesses <0.7mm, while DQ grade has an elongation of ≥24% for the same thickness. This excellent elongation ensures the steel strip is suitable for various cold working processes such as bending and stamping, and is less susceptible to breakage during processing.
What is the thickness range for DX51D+Z100 steel strip?
The conventional production thickness range is 0.12-3mm, which generally covers the application requirements of most industries. Among them, thin-gauge steel strips of 0.12-0.5mm are often used in scenarios with high requirements on weight and precision, such as home appliance casings and electronic equipment accessories; medium-gauge steel strips of 0.5-2mm are widely used in building keels and automotive interior parts; thick-gauge steel strips of 2-3mm are suitable for fields with higher requirements on strength, such as mechanical structural parts and container accessories. Some manufacturers can customize products with thickness beyond the conventional range according to special customer needs.