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Grade Introduction:
The term Mild Steel applies to all low carbon steel that does not
contain any alloying elements in its makeup and has a carbon content
that does not exceed 0.25%. The term “Mild” is used to cover a wide
range of specifications and forms for a variety of Steel.
Mild Steel is used in mechanical engineering applications for parts
that will not be subject to high stress.
When in its bright cold drawn condition the Steel is able to endure
higher levels of stress, particularly on smaller diameters.
Compared to normal Mild Steel, bright Mild Steel provides tighter
sectional tolerances, increased straightness, and a much cleaner
surface. The main advantage of cold drawn Steel is that Steel can be
brought closer to the finished machine size, providing reduce
machining costs. Another benefit of bright Steel bars is a marked
increase in physical strength over hot rolled bars of the same
section.
EN3B bright Mild Steel (070m20) used to be the most popular
specification of bright Mild Steel available. It has since been
replaced by steels that have a tighter chemical analysis.
EN3B Bright Mild Steel is now a general purpose Steel that is suitable
for welding, can be case-hardened and is good for general machining.
EN3B is generally used in engineering applications that will not be
heavily stressed.
Grade Application:
Equivalent grades:
| BS 970 1991 | BS 970 1955 EN | AISI/SAE | Werkstoff |
| 070M20 | EN3B | 1020 | 1.0402 |
Addition to other grades:
MS, 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, SAE 52100, S40C, S355J2G3.
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Chemical composition:
The following table shows the chemical composition of EN3B steel:
| Element | C | Si | Mn | P | S | Cr | Mo | Ni |
| Content (%) | 0.25 Max | 0.35 Max | 1.0 Max | 0.06 Max | 0.06 Max | – | – | – |
Mechanical Properties:
| Condition | Tensile Strength MPa Min. | Yield Strength MPa Min. | Elongation % |
| Cold drawn | 560 | 440 | 10 |
| Turned & Polished | 430 | 215 | 21 |
Hardness:
Heat Treatment:
Hardening:
Tempering:
Physical Properties
Thermal Properties
Forging Properties:
Stress Relieving:
Normalizing:
Annealing:
Density:
Machinability:
Welding:
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