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:
Applications of MS Mild/Low Carbon Steel:
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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.
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It is widely used for fixtures, mounting plates, and spacers.
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It is suitably used in applications that do not need high strength of alloy steels and high carbon.
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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.
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It is used to improve drilling, machining, threading, and punching processes.
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It is used to prevent cracking in severe bends
MS Equivalent grades:
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS M2, M35, M42, DIN-1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTM SA-105 , SAE1018, SAE1010, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
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MS 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 |
MS 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 |
MS Hardness:
MS Heat treatment:
A significant amount of this grade of steel is used in the as- forged condition since its machinability 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.
MS Hardening:
This process requires heating to be carried out between 780°C – 820°C. MS mild/low carbon steel is then quenched in water.
MS 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.
MS Physical Properties:
Physical Properties |
Metric |
Imperial |
Density |
7.87 g/cc |
0.284 lb/in3 |
MS Thermal Properties:
MS 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.
MS 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.
MS Normalizing:
MS mild/low carbon steel should be heated at 890°C – 940°C and then cooled in still air.
MS Annealing:
The MS mild/low carbon steel is heated at 870°C – 910°C and allowed to cool in a furnace.
MS Density:
Density |
7.87 g/cc |
0.284 lb/in3 |
MS Machinability:
The machinability of MS mild/low carbon steel is graded at 78% of B1112.
MS 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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