Mild Steel Plates – Complete Guide to Properties, Grades, Uses & Specifications

Mild Steel (MS) plates are among the most widely used carbon steel products in construction, fabrication, infrastructure, and manufacturing industries. Known for their excellent weldability, machinability, and cost-effectiveness, mild steel plates provide reliable structural performance for a wide range of general engineering applications.

This detailed guide covers definition, chemical composition, mechanical properties, grades, manufacturing process, sizes, applications, advantages, standards, fabrication, testing, and price factors of mild steel plates.

What Are Mild Steel Plates?

Mild Steel Plate is a flat steel product made from low carbon steel, typically containing 0.05% to 0.25% carbon. The low carbon content makes the steel softer, more ductile, and easier to weld compared to high-carbon steels.

Mild steel plates are widely used in structural and general fabrication work due to their balance of strength, flexibility, and affordability.

Chemical Composition of Mild Steel Plates

The composition may vary depending on grade, but typical content includes:

• Carbon (C): 0.05–0.25%

• Manganese (Mn): 0.25–1.50%

• Silicon (Si): Up to 0.40%

• Phosphorus (P): Max 0.04%

• Sulfur (S): Max 0.05%

• Iron (Fe): Balance

The low carbon content improves weldability and ductility while maintaining adequate strength for structural applications.

Mechanical Properties

Typical mechanical properties of mild steel plates:

• Tensile Strength: 400–550 MPa

• Yield Strength: 250–350 MPa (varies by grade)

• Elongation: 20–25%

• Hardness: ~120–180 HB

• Density: 7.85 g/cm³

These properties make MS plates suitable for load-bearing and structural uses.

Common Grades of Mild Steel Plates

Different grades are available based on strength and application:

1️⃣ IS 2062 (India)

• E250

• E350

• E410

2️⃣ ASTM Standards

• ASTM A36

• ASTM A283

• ASTM A572

3️⃣ EN Standards

• S235JR

• S275JR

• S355JR

Each grade differs in yield strength and chemical composition depending on structural requirements.

Manufacturing Process

Mild steel plates are manufactured through:

1. Iron ore smelting in blast furnace
2. Steel refining process
3. Continuous casting
4. Hot rolling into plates
5. Controlled cooling
6. Surface finishing and testing

Hot rolling improves the mechanical properties and dimensional stability of the plate.

Types of Mild Steel Plates

Mild steel plates are available in several forms:

• Hot Rolled Plates

• Cold Rolled Plates

• Chequered Plates (anti-skid pattern)

• Structural Plates

• Boiler Quality Plates

• Pressure Vessel Plates

Each type is designed for specific industrial needs.

Available Sizes & Dimensions

Mild steel plates are available in:

• Thickness: 3 mm to 200 mm

• Width: Up to 2500 mm or more

• Length: Up to 12000 mm

• Custom cut sizes available

Thickness selection depends on load requirements and structural design.

Applications of Mild Steel Plates

Mild steel plates are used across multiple industries:

Chhajed Steel and Alloys is the largest manufacturer, supplier and stockist of Plates to various countries like Saudi Arabia, Kuwait, Qatar, Oman, Yemen, Uae, Iran, Turkey.