ASTM A588 Grade K steel plate is a high-strength, low-alloy structural steel designed to provide superior resistance to atmospheric corrosion.
It offers a minimum yield strength of 345 MPa for plates up to 100 mm thickness, making it ideal for applications requiring both strength and durability.
When properly exposed to the atmosphere, A588 Grade K develops a protective oxide film, which minimizes further corrosion and eliminates the need for painting.
This makes it highly suitable for bridges, structural frameworks, and outdoor architectural applications used in the bare condition.
Available Sizes
Thickness: 6 mm – 200 mm
Width: 1500 mm – 4050 mm
Length: 3000 mm – 15000 mm
Produced by Gnee Steel with advanced rolling and heat-treatment capabilities.
Supplementary Testing and Options
Available upon request:
HIC Test | NACE MR0175 | Z15 | Z25 | Z35 | S2 | S3 | S5 | S6 | S8 | S18 | S30
These options ensure superior toughness, low-temperature performance, and hydrogen-induced cracking resistance, ideal for demanding structural and offshore environments.
Chemical Composition (Max %)
| Element | C | Si | Mn | P | S | Ni | Nb | Cu | Cr | Mo | V |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A588 Grade K | 0.17 | 0.25–0.50 | 0.50–1.20 | 0.04 | 0.05 | 0.40 | 0.005–0.05 | 0.30–0.50 | 0.40–0.70 | 0.10 | – |
Carbon Equivalent (Ceq):
Ceq = [C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15] %
Mechanical Properties
| Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| ≤100 | ≥345 | 485 | 21 |
| 100–125 | ≥315 | 460 | 20 |
| 125–200 | ≥290 | 435 | 18 |
Density: 7.85 g/cm³
Brinell Hardness: approx. 150–170 HB
Key Advantages
Excellent Atmospheric Corrosion Resistance: Service life up to 50 years without painting in typical outdoor environments.
Cost Efficiency: Reduces maintenance costs by 30–40% over conventional carbon steel due to its self-protecting patina.
Superior Strength-to-Weight Ratio: Enables up to 20% weight reduction in structural designs without compromising strength.
Sustainability: Low maintenance and long life make it ideal for eco-conscious construction projects.
