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Grade Introduction:
MS mild/low carbon steel has excellent weldability, produces a uniform and harder case and it 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.
 
Grade Application:
Applications of MS Mild/Low Carbon Steel:
  • 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 a soft core 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 improve drilling, machining, threading and punching processes.
  • It is used to prevent cracking in severe bends
 
Equivalent grades:
 
Addition to other grades:
EN1a, EN3b, EN8, EN8d, EN9, EN19, EN24, EN31, EN32b, EN36c, EN41b, EN43b, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, 2714, SKD-11, P20, P20+s, P20+Ni, SCM 420, ASTM Sa-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
 
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Chemical composition:
The following table shows the chemical composition of MS steel:
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:
Mechanical Properties
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
Poissons Ratio (Typical For Steel)
0.290
0.290
Machinability (Based on AISI 1212 steel. as 100% machinability)
70 %
70 %
Shear Modulus (Typical for steel)
80.0 GPa
11600 ksi
 
Hardness:
 
Heat treatment:
A significant amount of this grade of steel is used in the as- forged condition, since its machine ability in this condition has been found to be better than that in the normalized condition.
Little is to be gained, at this carbon level, by a quenching treatment.
 
Hardening:
This process requires heating to be carried out between 780°C – 820°C. MS mild/low carbon steel is then quenched in water.
 
Tempering:
MS mild/low carbon steel is tempered at 150°C – 200°C to improve case toughness. This process has little or no effect on hardness. Grinding cracks are reduced when MS mild/low carbon steel is tempered.
 
Physical Properties:
Physical Properties
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 is held until the temperature becomes constant. 900°C is the minimum temperature required for the forging process. The steel is cooled in air after this process.
 
Stress Reliving:
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.
 
Normalizing:
MS mild/low carbon steel should be heated at 890°C – 940°C and then cooled in still air.
 
Annealing:
The MS mild/low carbon steel is heated at 870°C – 910°C and allowed to cool in a furnace.
 
Density:
Density
7.87 g/cc
0.284 lb/in3
 
Machine ability:
The machinability of MS mild/low carbon steel is graded at 78% of B1112.
 
Welding:
MS mild/low carbon steel can be instantly welded by all the conventional welding processes. Welding is not recommended for MS mild/low carbon steel when it is carbonitrided and carburized.
Low carbon welding electrodes are used in the welding procedure. Post-heating and pre-heating are not necessary; although pre-heating can be performed for sections over 50 mm. Post-weld stress-relieving also has benefits, like the pre-heating process.
 
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