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GMW3032M | Vda 239-100 HR420LA Steel Coil Hot Rolled Steel
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SteelPro Group offers HR420LA steel coils that allow manufacturers to produce lightweight yet strong components. Our HR420LA products are manufactured in compliance with ISO, EN, JIS, and ASTM standards, ensuring consistent performance in automotive environments.
What Is HR420LA Automotive Steel?
HR420LA is a high-strength, low-alloy (HSLA) hot-rolled steel commonly used in the automotive industry. It is designed for applications requiring strength, formability, and weldability. The “HR” indicates hot-rolled production, and “420” refers to its minimum yield strength of 420 MPa, making it suitable for critical automotive structural components.
HR420LA Steel Equivalent Grades
| Standard | Equivalent Grade |
| JIS | SAPH440 |
| ASTM | A1011 HSLAS-F Grade 50 |
| DIN/EN | S420MC |
Key Features of HR420LA Steel
- High Strength: With a minimum yield strength of 420 MPa, HR420LA provides excellent load-bearing capacity for critical structural components.
- Good Formability: Despite its high strength, HR420LA can be formed into complex shapes without cracking, ensuring design flexibility.
- Excellent Weldability: It is compatible with common welding methods, such as resistance welding and spot welding, ensuring durable joints in automotive assemblies.
- Surface Quality: As a hot-rolled product, HR420LA has a consistent surface finish, making it suitable for further processing, such as painting or coating.
HR420LA Steel Coils and Sheets Size Range
SteelPro Group offers HR420LA hot-rolled coils and sheets with the following size ranges, ensuring high quality and precision for automotive applications:
HR420LA Steel Coils
Typically used in automotive frames, structural parts, and underbody components.
| Dimension | Metric (mm) | Imperial (inches) |
| Thickness | 0.7 – 6.0 | 0.028″ – 0.236″ |
| Width | 800 – 2000 | 31.5″ – 78.7″ |
| Length | Coil length varies | Coil length varies |
HR420LA Steel Sheets
Commonly employed in large automotive panels and structural reinforcements.
| Dimension | Metric (mm) | Imperial (inches) |
| Thickness | 0.7 – 6.0 | 0.028″ – 0.236″ |
| Width | 800 – 2000 | 31.5″ – 78.7″ |
| Length | 2000 – 12000 | 78.7″ – 472.4″ |
We offer custom dimensions to meet specific automotive manufacturing requirements. Dimensional tolerances are strictly maintained according to industry standards such as EN 10149.
- HR420LA hot-rolled coated steel is thicker than cold-rolled galvanized steel. It works well for strong, thick parts where surface finish is not very important, like automotive chassis.
HR420LA Steel Chemical Composition
| Element | Typical Range (%) |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | 0.80 – 1.40 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.025 |
| Aluminum (Al) | 0.015 – 0.060 |
| Titanium (Ti) | 0.10 – 0.20 |
The precise balance of alloying elements in HR420LA ensures exceptional strength without compromising flexibility. Controlled carbon levels improve weldability, while manganese and silicon enhance tensile strength and formability, making it ideal for automotive components subjected to dynamic loads.
HR420LA Steel Mechanical Properties
| Property | Typical Value |
| Yield Strength | ≥ 420 MPa (≥ 60.9 ksi) |
| Tensile Strength | 480 – 620 MPa (69.6 – 89.9 ksi) |
| Elongation (A80) | ≥ 16% |
| Hardness (HRB) | ≤ 88 |
HR420LA Steel Coils Common Production Processes
The production of HR420LA Steel Coils involves refining, casting, reheating, and hot rolling. During refining, alloying elements are added to achieve the steel’s high strength and formability. The molten steel is then formed into large blocks, which are heated once more and flattened into sheets of the required thickness using the hot rolling method.
After cooling, the strips are coiled, inspected for quality, and packaged using protective materials to ensure safe transportation.
SteelPro Group provides the following specific custom services for HR420LA Steel Coils:
Pickling and Oiling
SteelPro Group provides pickled and oiled coils. The pickling removes surface scale, and the oil layer protects against corrosion.
Galvanization
We supply HR420LA steel coils with customizable zinc coating weights, typically in the range of 60G/60G to 120G/120G (60 to 120 grams of zinc per square meter on each side).
Phosphating
Phosphate-coated coils are available to improve paint adhesion and provide additional protection against corrosion.
Cut-to-length service
SteelPro Group offers cut-to-length processing, where coils are cut into flat sheets of specific lengths with high flatness control, suitable for direct use in automotive structural parts.
HR420LA Steel Applications
HR420LA steel excels in applications requiring high strength, lightweight construction, and cost efficiency. Its low alloy content reduces overall production costs, making it a practical choice for manufacturers balancing performance with budget constraints.
Automotive Applications
- Chassis components
- Door impact beams
- Roof rails
- Floor reinforcements
- Crash-resistant parts
Structural Applications
- Machinery reinforcements
- Lightweight structural frames
- Equipment brackets
- Industrial paneling
Get High-quality HR420LA Steel Coils From SteelPro Group
SteelPro Group supplies high-quality HR420LA steel coils and sheets worldwide. Our products are certified on-site under the ISO9001:2008 and ISO/TS16949:2009 quality management systems, ensuring consistent performance and reliability.
Our dedicated support team assists in choosing appropriate materials and enhancing your manufacturing workflow. With advanced processing capabilities, we deliver tailored solutions to meet your exact specifications.
