CR300LA+Z cold-rolled galvanized steel coil?
CR300LA+Z is a high-strength cold-rolled galvanized steel coil, CR: Cold Rolled; 300: Lower limit of yield strength (300 MPa grade); LA: Low Alloy, indicating high strength achieved through microalloying or special processes; +Z: Zinc Coated, commonly hot-dip galvanizing (GI) or electroplating galvanizing (EG), with excellent strength, formability and corrosion resistance.
What is CR300LA+Z galvanized steel coil equivalent to?
European Standard (EN 10346)
DX54D+Z (approximate counterpart)
Similarities: cold rolled galvanized, 300 MPa yield strength, general purpose forming.
Differences: DX54D is more focused on formability, while CR300LA+Z may have slightly higher strength (low alloy strengthening).
Japanese Standard (JIS G 3302)
SGCC 340 (approximate)
Galvanized layer and strength are similar, but SGCC is ordinary carbon steel without low alloy strengthening.
American Standard (ASTM A653)
CS Type B (300 MPa grade)
Similar to galvanized structural steel, but the alloy system may be different.
CR340LA+Z (GB/T 20564.2)
DC54D+Z
Galvanized low carbon steel, good formability but slightly lower strength (yield about 260-300MPa).
What is the difference between CR300LA+Z steel coil and DX54D+Z steel coil?
|
CR300LA+Z |
Ordinary galvanized steel (DX54D+Z) |
|
|
300MPa yield strength |
180-220MPa |
|
|
Moderate (cost-effective) |
CR300LA+Z: Balances strength and formability, suitable for lightweight structural parts of the vehicle body.
DX54D+Z: Only used for non-load-bearing decorative parts (such as roof covers).
Why is CR300LA+Z cold rolled steel coil used in automobiles?
CR300LA+Z have:
High-strength lightweight design
✅ Yield strength >= 300MPa: Higher strength than ordinary galvanized steel (such as DX51D+Z), which can reduce material thickness and vehicle weight while ensuring structural strength (helps improve fuel efficiency or electric vehicle endurance).
✅ Low alloy strengthening (LA): By adding trace elements such as Nb and Ti to improve strength, it avoids the molding difficulties of traditional high-strength steel
✅ High elongation (>=20%): suitable for complex forming processes such as stamping and rolling, reducing the risk of cracking.
✅ Strong adhesion of the galvanized layer: The zinc layer is not easy to peel off during the stamping process, ensuring the surface quality of the parts.
