Q390A Q420A High Strength Steel Sheet
Q390A is a low alloy steel high-strength structural steel, compared with Q345 steel, the strength level has been improved, with higher comprehensive mechanical properties, generally in the hot rolled or normalised condition. Suitable for the manufacture of medium and high pressure boiler ladle, high and medium pressure petrochemical containers, pipelines, bridges and other high loads of welded structural parts.
Q420 is a low alloy high-strength structural steel, the implementation of the standard GB1591-2008, the grade is divided into A, B, C, D, E. Q420A high tensile steel sheet has high strength, good fatigue resistance; high toughness and low brittle transition temperature; good cold-forming properties and weldability; good corrosion resistance and some wear resistance. High strength, especially in the normalised or normalised plus tempered state has high comprehensive mechanical properties.
Q390A high tensile alloy steel chemical composition
| C | Si | Mn | P | S | V | Nb | Ti | Cr | Ni |
| 0.20 | 0.55 | 1.00-1.60 | 0.045 | 0.045 | 0.02-0.20 | 0.015-0.060 | 0.02-0.20 | 0.30 | 0.70 |
Q420A high strength structural steel chemical composition
| C | Si | Mn | P | S | V | Nb | Ti | Cr | Ni |
| 0.20 | 0.55 | 1.00-1.70 | 0.045 | 0.045 | 0.02-0.20 | 0.015-0.060 | 0.02-0.20 | 0.40 | 0.70 |
Q390A low alloy structural steel mechanical property
| Thickness (mm) | ||||
| Q390A | ≤ 16 | > 16 ≤ 35 | > 35 ≤ 50 | >50 |
| Yield strength (≥Mpa) | 390 | 370 | 350 | 330 |
| Tensile strength (Mpa) | 490-650 | |||
Q420A hSLA structural steel mechanical property
| Thickness (mm) | ||||
| Q420A | ≤ 16 | > 16 ≤ 35 | > 35 ≤ 50 | >50 |
| Yield strength (≥Mpa) | 420 | 400 | 380 | 360 |
| Tensile strength (Mpa) | 520-680 | |||
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