Mild steel plate is preferred in fabrication, construction, or anything involving structural steel. It’s used in shipyards, bridges, factory floors, storage tanks, and in applications that need steel in flat form. Getting the wrong grade or thickness for the job usually means delays and rework, so it helps to know what you’re actually ordering.
What Is an MS Plate?
An MS Plate is flat rolled steel made from mild steel, which means low carbon content, somewhere between 0.05% and 0.25%. That low carbon is what keeps the plate ductile. You can weld it, cut it, bend it, and it won’t turn brittle like higher carbon grades. This is why most fabricators turn to MS plate unless the job specifically needs something else. It’s not too hard or soft, and it takes drilling and welding without cracking under normal shop conditions.
What Are the Properties of MS Plates?
Usually the tensile strength of a mild steel plate is somewhere between 400 and 550 MPa, depending on the grade and the rolling process. That covers most structural work without needing to move into specialty alloys. Weldability is good across MIG, TIG, and arc processes, and in most cases you don’t need to preheat the metal first. Yield strength sits somewhere around 250 to 355 MPa, which is the point at which the plate starts to deform permanently under load. Hardness stays moderate too, around 120 to 150 Brinell, so machining doesn’t damage your tools. Corrosion resistance is limited, and the plate should be coated if it will be exposed to moisture or chemicals.
Types of MS Plates
- Hot rolled MS plates are formed above 1700°F and come with a scale finish, mostly used for structural and heavy fabrication work.
- Cold rolled MS plates are processed at room temperature, giving a smoother surface and tighter tolerances for precision parts.
- Checkered plates have a raised diamond pattern on one side, mainly for grip on flooring, walkways, and staircases.
- Boiler quality plates follow stricter chemical limits and are built for high pressure and temperature inside boilers and vessels.
- Shipbuilding plates come with classification society approval and are tested for toughness at low marine temperatures.
- Wear-resistant plates are treated or alloyed to resist abrasion, common in mining chutes, crusher liners, and earthmoving gear.
MS Plate Manufacturing Process
It begins with a slab of steel heated to about 1200°C, hot enough to go through the rolling mills. The slab passes through rollers over and over, each time getting thinner and thinner until it gets to the desired thickness. Hot rolling occurs above the recrystallisation temperature of the steel, relieving stress in the metal and providing a fairly uniform grain structure. After rolling, the plate cools on a runout table and is cut to length by shears or plasma cutting. Some batches go through normalizing after that, a heat treatment step that refines the grain and improves toughness, mostly for structural or boiler-grade orders. There are quality checks covering thickness, surface finish, and mechanical properties before anything goes into stock.
MS Plate Sizes and Thicknesses
Thickness generally ranges from 3mm up to 200mm, so it covers everything from light sheet work to heavy structural sections. Widths tend to run between 1250mm and 2500mm, and standard lengths go from 2500mm to 12000mm, though this depends a bit on the mill. Anything under 6mm is usually for ducting, cladding, or light enclosures where weight matters more than strength. The 10mm to 40mm range covers most structural beams, machine bases, and decking. Above 50mm, you have heavy equipment frames, pressure vessels, and shipbuilding hulls, where you need the plate to absorb impact and carry a serious load.
MS Plate Specifications and Standards
In India, IS 2062 is the standard most buyers reference for structural steel plate. It sets limits on carbon, manganese, and sulfur, along with minimum yield and tensile values. For international projects, ASTM A36 is common and broadly covers similar mild steel grades for general structural use. Generally, boilers and pressure vessels require IS 2002 or ASME SA516, which are more strict on chemistry and require impact testing at low temperatures. Each standard also defines the thickness tolerance, flatness, and the condition of the edges, so picking the right one for your application avoids problems at inspection down the line.
Applications of MS Plates
- Structural framing for buildings, bridges, and industrial sheds, where load-bearing capacity and weldability matter most.
- Shipbuilding hulls and decks use classification-approved grades tested for marine impact and low-temperature toughness.
- Pressure vessels and boilers rely on boiler-quality plates that meet strict chemical and mechanical tolerances.
- Heavy machinery bases, where thick plates absorb vibration and support equipment weight without deforming.
- Storage tanks for water, oil, and chemicals, using plate thickness matched to pressure and corrosion requirements.
- Flooring and walkways, where checkered plates provide slip resistance in factories and processing plants.
Advantages of MS Plates
- Costs less than alloy or stainless steel, which matters a lot on large structural projects.
- Welds easily across MIG, TIG, and arc processes, cutting down fabrication time on site.
- Comes in a wide range of thicknesses and sizes, so lead times stay shorter for standard orders.
- Machines well, meaning drilling and cutting don’t wear out tools as fast.
- It is recyclable as the scrap mild steel can be put straight back into production without the loss of its properties.
Contact MetalOre for stock and pricing on the Mild Steel Plate grade and thickness you need.