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Mild steel is carbon content less than 0.25% carbon steel, because of its low strength, low hardness and soft, so it is also called mild steel. It includes most ordinary carbon structural steel and a part of high-quality carbon structural steel, most of which are used for engineering structural parts without heat treatment, and some of which are used for mechanical parts requiring wear resistance after carburizing and other heat treatment.
The annealed structure of low carbon steel is ferrite and a little pearlite, its strength and hardness are lower, plasticity and toughness are better. Therefore, its cold formability is good, can be used to roll, bending, stamping and other methods for cold forming. The steel also has good weldability. Low carbon steel generally refers to the carbon content of the steel between 0.10 and 0.25%. This kind of steel has low hardness, good plasticity, easy to use cold plastic deformation molding process, welding and cutting, often used in the manufacture of chains, rivets, bolts, shafts and so on.
The SPCC is also mild steel. SPCC is the brand of Japanese Steel (JIS series). Ordinary structural steel is mainly composed of three parts. The first part is the material, such as S (Steel) for steel, F (Ferrum) for iron; The second part represents different shapes, types and uses, such as P(Plate) for plate, T (Tube) for tube,K(Kogu) for tools; The third part represents the characteristic number, which is generally the minimum tensile strength. For example: SS400 -- the first S represents Steel, the second S represents "Structure", 400 is the lower limit tensile strength of 400MPa, the overall tensile strength of 400MPa ordinary structural steel.
SPCC- stands for common cold rolled carbon steel sheet and strip, whose chemical composition and mechanical properties are equivalent to the Chinese grade Q195 and Q215A. The third letter C is short for Cold. To ensure that the tensile test, add T at the end of the grade is SPCCT.
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Chemical composition | |
(Ideal analysis to meet the majority of grades listed above) | |
Carbon | 0.16-0.18% |
Silicon | 0.40% max |
Manganese | 0.70-0.90% |
Sulphur | 0.040% Max |
Phosphorus | 0.040% Max |
Physical Properties | Metric | Imperial |
Density | 7.87 g/cc | 0.284 lb/in3 |
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 |
Electrical Properties | Metric | English | Comments |
Electrical resistivity @0°C (32°F) | 0.0000159 Ω-cm | 0.0000159 Ω-cm | annealed condition |
@100 °C/ 212 °F | 0.0000219 Ω-cm | 0.0000219 Ω-cm | annealed condition |
@ 200 °C/392 °F | 0.0000293 Ω-cm | 0.0000293 Ω-cm | annealed condition |