SHANGHAI RUICHAO INDUSTRIAL
SHANGHAI RUICHAO INDUSTRIAL
Cold rolled High-Strength Low-Alloy (HSLA) steel is a type of carbon steel that achieves higher strength than standard grades through the addition of small, precise amounts of alloying elements like niobium, vanadium, or titanium, which refine the grain structure. The cold rolling process enhances its strength further and provides a smooth, precise surface. This combination of increased strength, good formability, and weldability without the need for heat treatment makes it ideal for weight-saving structural applications such as automotive frames, chassis components, brackets, and reinforcement parts where durability is critical.
Specification Parameters
| Parameters of Cold Rolled High-Strength Low-Alloy (HSLA) Steel | ||
| Parameter Category | Key Characteristics/Values | Notes |
| Chemical Composition | C (Carbon): 0.05% - 0.25% | Low carbon ensures weldability/formability. Microalloys refine grains and precipitate for strength. |
| Mn (Manganese): 0.5% - 1.5% | ||
| Microalloys: Nb (Niobium), V (Vanadium), Ti (Titanium) (< 0.15% each) | ||
| Mechanical Properties | Yield Strength (YS): 275 MPa (40 ksi) to 550 MPa (80 ksi) | Higher strength grades have lower elongation. Properties are tailored by chemistry and processing. |
| Elongation: 15% - 30% | ||
| n-value (Strain Hardening): Varies by grade | ||
| r-value (Deep Drawing): Varies by grade | ||
| Common Grades (ASTM A1008) | HSLAS Class 1: 340 (340 MPa / 50 ksi YS) | Class 2 offers higher tensile strength for a given yield strength compared to Class 1. |
| HSLAS Class 1: 410 (410 MPa / 60 ksi YS) | ||
| HSLAS Class 1: 480 (480 MPa / 70 ksi YS) | ||
| HSLAS Class 2: 550 (550 MPa / 80 ksi YS) | ||
| Dimensional Parameters | Thickness: 0.5 mm (0.020 in) to 3.0 mm (0.120 in) | Produced to tight dimensional tolerances characteristic of cold rolling. |
| Width: Up to ~72 inches (standard mill widths) | ||
| Surface Finish | Smooth, matte finish typical of cold-rolled sheet | Classified per application (e.g., Commercial, Drawing). Ideal for painting. |
| Primary Application | Automotive frames, chassis components, brackets, reinforcement parts | Selected for weight savings and increased durability without heat treatment. |
