MS

MS Grade Introduction:

MS mild/low carbon steel has excellent weldability, produces a uniform and harder case, and is considered the best steel for carburized parts. MS mild/low carbon steel offers a good balance of toughness, strength, and ductility. MS hot rolled steel has significant mechanical properties, improved machining characteristics, and has a high Brinell hardness measure. Specific manufacturing controls are used for surface preparation, chemical composition, rolling and heating processes. All these processes develop a supreme quality product that is suited to fabrication processes such as welding, forging, drilling, machining, cold drawing, and heat treating.

MS Grade Application:

  • It is used in bending, crimping, and swaging processes. Carburized parts that include worms, gears, pins, dowels, non-critical components of tool and die sets, tool holders, pinions, machine parts, ratchets, dowels, and chain pins use MS mild/low carbon steel.
  • It is widely used for fixtures, mounting plates, and spacers.
  • It is suitably used in applications that do not need high strength of alloy steels and high carbon.
  • It provides high surface hardness and softcore to parts that include worms, dogs, pins, liners, machinery parts, special bolts, ratchets, chain pins, oil tool slips, tie rods, anchor pins, studs, etc.
  • It is used to prevent cracking in severe bends

MS Equivalent Grades:

MS Chemical Composition:

Element C Fe Mn P S
Content (%) 0.14-0.20 98.81-99.26 0.60-0.90 ≤ 0.040 ≤ 0.050

Mechanical Properties:

Property Metric Imperial
Hardness, Brinell 126 126
Hardness, Knoop (Converted from Brinell hardness) 145 145
Hardness, Rockwell B (Converted from Brinell hardness) 71 71
Hardness, Vickers (Converted from Brinell hardness) 131 131
Tensile Strength, Ultimate 440 MPa 63800 psi
Tensile Strength, Yield 370 MPa 53700 psi
Elongation at Break (In 50 mm) 15.0 % 15.0 %
Reduction of Area 40.0 % 40.0 %
Modulus of Elasticity (Typical for steel) 205 GPa 29700 ksi
Bulk Modulus (Typical for steel) 140 GPa 20300 ksi
Poisson's Ratio (Typical For Steel) 0.290 0.290

Physical Properties:

Property Metric Imperial
Density 7.87 g/cc 0.284 lb/in³

Thermal Properties:

Forging Properties:

This process requires heating at 1150°C – 1280°C and MS mild/low carbon steel are held until the temperature becomes constant. 900°C is the minimum temperature required for the forging process. The steel is cooled in the air after this process.

Stress Relieving:

A temperature of 500°C – 700°C is required to relieve stress in MS mild/low carbon steel that is later cooled down in still air.

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