Introduction
Low-carbon steel hot-rolled round strip (GB/T701-1997) is a kind of hot-rolled strip product made of low-carbon steel. It is an important member of the hot-rolled strip family. It is widely used in construction and machinery manufacturing and is one of the conventional steel products. Its main features are: low carbon, good plasticity, easy welding and galvanizing, good machinability and so on.
Material Characteristics
Low-carbon steel hot-rolled round strip (GB/T701-1997) is an alloy of carbon and iron. Generally, its carbon content ranges from 0.04% to 0.18%. The low content of carbon makes it have good plasticity, easy welding and galvanizing, and good machinability. The chemical components of the low-carbon steel hot-rolled round strip (GB/T701-1997) are shown in Table 1. Generally speaking, except for non-metallic impurities such as sulfur and phosphorus, low-carbon steel also contains trace elements such as manganese, silicon, copper, and nickel. The role of manganese is to improve the hardenability of steel, and its content is generally 0.20% ~ 0.60%. Silicon can increase the strength and reduce atmospheric corrosion; copper can increase the strength and improve the process performance; nickel can make the steel obtain good magnetic properties.
Table 1: Chemical Components of Low-carbon Steel Hot-rolled Round Strip (GB/T701-1997)
C (≤) 0.14-0.18
Si (≤) 0.15-0.35
Mn (≤) 0.30-0.90
P (≤) 0.030
S (≤) 0.020
Ni (≤) 0.08
Cu (≤) 0.15
Processing Technology
The manufacturing process of low-carbon steel hot-rolled round strip (GB/T701-1997) includes the following steps:
1. The raw material required for the production of strips is first heated in the electric furnace, and then the required chemical composition is maintained by adding appropriate amounts of various alloys.
2. Then, pouring the molten steel into the continuous casting machine and then shaping it into slabs through several rollers, and then cut it into strips of a certain width and size.
3. Then, the packaged coil is delivered to the hot rolling mill and heated again. After heating, the slab is rolled through several grooved rollers to obtain strips of a certain width and thickness.
4. After that, the hot rolled strips are annealed to eliminate internal stresses and soften the steel.
5. Finally, the coiled annealed strips are delivered to the cold-rolling mill and further rolled. After annealing, the surface of the strips is slightly oxidized, and then treated by pickling and phosphating, so that it has a bright, smooth, and corrosion-resistant surface.
Applications
Low-carbon steel hot-rolled round strip (GB/T701-1997) is widely used in construction and machinery manufacturing industries, such as the production of automobile and agricultural machinery parts, the construction of railway bridges and oil pipelines, the manufacture of various types of cold-formed steel, and the production of various types of containers. In addition, it can also be used to manufacture bicycle frames, electric cars, tool boxes and other stamped parts.
Conclusion
In conclusion, low-carbon steel hot-rolled round strip (GB/T701-1997) has low carbon content, good plasticity, easy welding and galvanizing, good machinability, and is widely used in construction and machinery manufacturing industries. It is an important member of the hot-rolled strip family and its applications cover a wide range.
