MS PIPE FITTINGS AND FLANGES
MS (Mild Steel) pipe fittings and flanges are essential components in piping systems, commonly used in industries such as oil and gas, power plants, chemical manufacturing, and construction. Mild steel, known for its low carbon content, offers excellent weldability and machinability, making it suitable for various applications where moderate strength and corrosion resistance are acceptable. MS pipe fittings include elbows, tees, reducers, caps, and couplings, which are used to change the direction, branch off, reduce or close the pipe ends. MS flanges are used to connect pipes, valves, pumps, and other equipment to form a piping system.
MS Pipe Fittings – Specification
| Fitting Type |
Size Range (NB) |
Thickness (SCH) |
Material Grade |
Standard |
| Elbow (90°/45°) |
15 mm – 600 mm |
SCH 10 – SCH 80 |
IS 1239 / IS 3589 |
ASME B16.9 / B16.28 |
| Tee |
15 mm – 600 mm |
SCH 10 – SCH 80 |
IS 1239 / IS 3589 |
ASME B16.9 |
| Reducer (Concentric/Eccentric) |
20 mm – 600 mm |
SCH 10 – SCH 80 |
IS 1239 / IS 3589 |
ASME B16.9 |
| Cap |
15 mm – 600 mm |
SCH 10 – SCH 80 |
IS 1239 / IS 3589 |
ASME B16.9 |
| Coupling |
15 mm – 100 mm |
SCH 10 – SCH 80 |
IS 1239 / IS 3589 |
ASME B16.11 |
MS Flanges – Specification
| Flange Type |
Size Range (NB) |
Pressure Class |
Material Grade |
Standard |
| Slip-On Flange |
15 mm – 1200 mm |
150# – 2500# |
IS 2062 / ASTM A105 |
ASME B16.5 / IS 6392 |
| Weld Neck Flange |
15 mm – 1200 mm |
150# – 2500# |
IS 2062 / ASTM A105 |
ASME B16.5 / IS 6392 |
| Socket Weld Flange |
15 mm – 100 mm |
150# – 900# |
IS 2062 / ASTM A105 |
ASME B16.5 |
| Blind Flange |
15 mm – 1200 mm |
150# – 2500# |
IS 2062 / ASTM A105 |
ASME B16.5 / IS 6392 |
| Threaded Flange |
15 mm – 100 mm |
150# – 600# |
IS 2062 / ASTM A105 |
ASME B16.5 |
Chemical Composition
| Element |
Typical Composition (%) |
| Carbon (C) |
0.15 – 0.25 |
| Manganese (Mn) |
0.60 – 1.60 |
| Silicon (Si) |
≤ 0.40 |
| Sulphur (S) |
≤ 0.050 |
| Phosphorus (P) |
≤ 0.050 |
| Iron (Fe) |
Balance |
Mechanical Properties
| Property |
Typical Value |
| Yield Strength |
250 – 300 MPa |
| Tensile Strength |
410 – 560 MPa |
| Elongation (in 50 mm) |
≥ 20 – 25% |
| Hardness |
≤ 190 HB |
| Modulus of Elasticity |
~200 GPa |
| Density |
~7.85 g/cm³ |
