What is the material of CR340LA+Z steel coil?
The base material of CR340LA+Z galvanized steel coil is cold-rolled low-alloy high-strength steel (HSLA) galvanized coil, and the surface is hot-dip galvanized (Z)
Composition characteristics:
Low carbon (C≤0.12%): ensure weldability and formability.
Microalloying elements (such as Nb, Ti, V): improve strength through fine grain strengthening and precipitation hardening.
Low phosphorus, low sulfur (P, S≤0.025%): improve stamping performance and toughness
|
Element |
C (Carbon) |
Mn (Manganese) |
P (Phosphorus) |
S (sulfur) |
Nb (niobium) / Ti (titanium) |
|
Content |
≤0.12% |
0.5~1.5% |
≤0.025% |
≤0.025% |
0.01~0.1% |
Coating type:
GI (Hot-Dip Galvanized): pure zinc coating, bright white surface, good corrosion resistance.
GA (Galvannealed): zinc-iron alloy coating (Fe-Zn alloy), dark gray color, better weldability.
Coating weight: common double-sided coating 60/60 g/m² (Z60), can be customized according to needs
CR340LA+Z galvanized steel coil is equivalent to?
|
Standard system |
Direct Equivalent Grade |
Approximate alternative grades |
Differences |
|
China (GB) |
HC340LAD+Z |
HC340LA+Z |
More stringent composition requirements |
|
Europe (EN) |
HX340LAD+Z |
HX340LAD+ZF |
"+ZF" is zinc-iron alloy coating |
|
Japan (JIS) |
SAPH370+Z |
SAPH440+Z |
440 grade has slightly higher strength (needs verification) |
|
USA (ASTM) |
ASTM A653 SS340 |
ASTM A792 Gr340 |
Al-zinc plating grades are optional |
CR340LA+Z steel is used for?
CR340LA+Z galvanized steel coil is a "jack of all trades" material that combines strength, corrosion resistance and cost-effectiveness. It is used for:
Automobile safety parts (requires lightweight design)
Recommended model: CR340LA+ZF (zinc-iron alloy coating)
Reason: less welding smoke, more suitable for robot automated welding production line
Appearance parts of home appliances (requires surface quality + rust prevention)
Recommended model: CR340LA+Z (smooth surface)
Reason: surface Ra≤0.8μm, can be directly coated/sprayed, eliminating the grinding process
Building load-bearing structure (requires long life + high load)
Recommended model: CR340LA+Z120 (thick coating)
Reason: C3/C4 corrosion environment (such as chemical plants) requires a higher level of corrosion resistance
Can CR340LA+Z steel replace ordinary galvanized steel (DX51D+Z)?
Yes, but the strength requirements need to be evaluated - CR340LA+Z is stronger and suitable for load-bearing parts; ordinary galvanized steel is more suitable for general structures.
Does the zinc coating affect welding?
GA (zinc-iron alloy) coating has better weldability than GI (pure zinc), but the current must be controlled and ventilation must be provided during welding (zinc vapor is harmful)