Understanding Mild Steel (MS) Grades

Mild steel is one of the most versatile and widely used materials in industrial casting and manufacturing. The strict control of chemical composition, especially Carbon (C), Manganese (Mn), and Silicon (Si), determines the mechanical properties, weldability, and structural integrity of the final cast component.

Chemical Composition

Comparison of key elements (Max % unless specified)

Standard (Region)	Grade	Carbon (C %)	Manganese (Mn %)	Silicon (Si %)	Sulfur (S %)	Phosphorus (P %)
IS 2062 (India)	E250	0.23 max	1.50 max	0.40 max	0.045 max	0.045 max
ASTM A36 (USA)	A36	0.26 max	0.80 - 1.20	0.40 max	0.050 max	0.040 max
EN 10025-2 (Europe)	S235JR	0.17 max	1.40 max	0.35 max	0.040 max	0.040 max
DIN 17100 (Germany)	St37-2	0.17 max	1.40 max	-	0.050 max	0.050 max
JIS G3101 (Japan)	SS400	0.20 - 0.25 (Typ)	-	-	0.050 max	0.050 max

Equivalent Global MS Grades

Region / Country	Standard Code	Structural Steel Grade	Tensile Strength (MPa)
India	IS 2062	E250A / Fe410WA	410 min
USA	ASTM Series	A36	400 - 550
Europe	EN 10025-2	S235JR	360 - 510
Germany	DIN 17100	St37-2	360 - 510
Japan	JIS G3101	SS400	400 - 510
UK	BS 4360	43A	430 - 510

Common Industrial Applications

Mild steel grades offer excellent weldability and machinability, making them ideal for diverse applications.

Casting & Moulding

Used for casting heavy machinery beds, pump housings, and large industrial brackets where structural integrity is key.

Metal Fabrication

Highly favored for welding and fabrication works due to low carbon content preventing crack formations.

Machinery Parts

Ideal for general engineering components, shafts, base plates, and structural frames in manufacturing lines.

Structural Components

Used in construction, bridging, and heavy infrastructure projects as support beams and load-bearing structures.

Mild Steel (MS) Grades & Global Standards