🟪 Product Overview
HSLA (High‑Strength Low‑Alloy) Steel Plate is engineered to deliver higher strength, better toughness, and improved weldability compared with conventional carbon steel.
HSLA steel achieves superior performance through micro‑alloying elements such as:
- Niobium (Nb)
- Vanadium (V)
- Titanium (Ti)
- Manganese (Mn)
These steels offer:
- Higher yield strength
- Better atmospheric corrosion resistance
- Improved formability
- Reduced structural weight
- Excellent performance in demanding engineering environments
🟪 Key Features
- High strength with reduced weight
- Excellent weldability and formability
- Good atmospheric corrosion resistance
- Suitable for bending, cutting, and fabrication
- Ideal for heavy‑duty structural applications
🟪 Included Grades
GB / Chinese Standard
- Q355B / Q355C / Q355D / Q355E
- Q420B / Q420C / Q420D / Q420E
- Q460C / Q460D / Q460E
ASTM / ASME
- A572 Gr 50 / 60 / 65
- A656 Gr 50 / 60 / 70 / 80
- A709 (36 / 50 / 50W / HPS50W)
EN Standard
- S355JR / S355J0 / S355J2
- S420 / S460（optional expansion）
🟪 Mechanical Properties (Typical)
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|
| Q355D | ≥355 MPa | 490–630 MPa | ≥20% |
| Q420D | ≥420 MPa | 520–680 MPa | ≥18% |
| A572 Gr 50 | ≥345 MPa | 450–620 MPa | ≥18% |
| A656 Gr 70 | ≥485 MPa | 620–795 MPa | ≥17% |
| S355J2 | ≥355 MPa | 470–630 MPa | ≥22% |
🟪 Chemical Composition (Typical)
| Grade | C (%) | Mn (%) | Si (%) | Nb/V/Ti | P (%) | S (%) |
|---|
| Q355D | ≤0.20 | ≤1.70 | ≤0.50 | Micro‑alloyed | ≤0.035 | ≤0.035 |
| Q420D | ≤0.20 | ≤1.70 | ≤0.50 | Micro‑alloyed | ≤0.030 | ≤0.030 |
| A572 Gr 50 | ≤0.23 | 1.35 | ≤0.40 | V/Nb | ≤0.040 | ≤0.050 |
🟪 Product Specifications
Thickness
Width
Length
Delivery Conditions
- Hot Rolled
- Normalized
- Thermo‑Mechanically Rolled
- Quenched & Tempered（for certain grades）
🟪 Applications
Construction & Infrastructure
- Steel structures
- Industrial buildings
- Support beams
- Columns
Bridges & Engineering
- Bridge beams
- Girders
- Structural members
Heavy Machinery & Equipment
- Mining equipment
- Cranes
- Excavators
- Load‑bearing components
Transportation & Fabrication
- Truck frames
- Trailers
- Railway components
🟪 Why Choose WelSteels
- Full range of HSLA steel grades
- High strength with excellent weldability
- Precision cutting and processing
- SGS / BV inspection
- Export‑grade seaworthy packaging
