JIS S45C Round Steel
JIS S45C round steel is a general carbon engineering steel. It is usually supplied in the black hot rolled or occasionally normalised condition and exhibits reasonable strength and weldability.
Its appearance is smooth and round, without lines or ribs. It can be processed to manufacture ordinary mechanical parts and general rod steel.
Tensile Strength
The tensile strength of steel is the maximum stress a material can bear before it ruptures or breaks under its own weight. It is determined by the material’s chemical composition and the way it has been processed. The higher the tensile strength, the harder and stronger the steel.
We are a reliable stockist and manufacturer of cold drawn S45C round steel and ground bar for all applications. We offer a wide range of sizes in various lengths and diameters. Our team of experts is always ready to help you select the right size for your specific application.
S45C is a general carbon engineering steel supplied in the black hot rolled or occasionally normalized condition with a typical tensile range of 570 – 700 MPa and Brinell hardness ranging from 170 – 210. It is a versatile medium tensile steel with good weldability, machinability and reasonable impact properties in the as supplied condition.
It also responds very well to forging and heat treatment, gaining excellent strength and hardness. It is used in a wide range of applications such as gears, general rod steel parts, axles and shafts, bolts structural steel and studs. It is suitable for welding but must be done in accordance with accepted shop practices. It can be successfully flame or induction hardened but does not respond satisfactorily to nitriding.
Strength at Room Temperature
This grade of steel is a medium carbon engineering grade that offers a balance of strength, ductility and wear resistance. It can be cold drawn or forged, as well as flame or induction hardened. It is also characterized by good machinability and weldability, and is a popular choice for use in machinery parts that require moderate strength and wear resistance.
This steel grade can be further strengthened with heat treatment to provide added mechanical properties. Typical treatments include quenching, tempering, and normalizing. This steel can also be surface hardened by carburizing to give it greater wear resistance and extend its lifespan.
Forged S45C offers excellent machinability, meaning it can be easily shaped and forged into components such as bolts, shafts, and flanged rings. It can be hot rolled or cold rolled to the desired length and thickness, and is also available in round or square section. This grade is ideal for applications that demand greater strength, hardness and durability than the lower grade low carbon mild steels can offer. It can be clad with hard chrome to provide added protection against corrosion and reduce friction, although this is not a substitute for proper maintenance. It can also be plated with zinc to prevent the formation of hydrogen embrittlement and prolong the life of the steel. This steel grade is commonly used in machine tools, jigs and fixtures, hydraulic machinery, industrial furnaces, and other equipment.
Strength at High Temperature
Generally speaking, the strength of steel at high temperatures is lower than at room temperature. This is due to the fact that the crystalline structure of the steel becomes distorted under these conditions. This is why most of the high-temperature grades of steel are tempered in order to reduce this distortion.
Among the many engineering steels available, machine structural grade S45C is one of the most popular. It is an unalloyed medium carbon engineering steel, characterized by good machinability and excellent tensile properties in the normalised condition. It is suitable for shafts, studs and keys. It can be hardened by carburizing to achieve higher mechanical properties, but it does not respond satisfactorily to nitriding.
The forming and welding of this grade of steel is fair, compared with other low carbon steels. It is however, not a good choice for machining and cold-forming. It does, however, respond well to heat treatment, allowing it to be forged into complicated shapes. For this reason, this grade of steel is commonly used in nuts and bolts, axles, rollers, springs, wires, wheel frames, rods, engine parts, stamping dies, hammers, lock washers/lock pin gaskets, turbine rotors, railway tracks, cylinder sleeves and hand tools. This grade of steel is also used in many other mechanical applications and can be supplied in various sizes. It is often supplied as rolled bar and plate.
Hardness
As a medium carbon steel grade, JIS S45C round bar has a moderate level of hardness and strength that makes it versatile for different uses without being overly brittle. Hot dipped galvanized SGCC steel plate After heat treatment, the machinability of this grade is excellent and it can be easily welded. It also has good formability, and it responds well to forging.
The tensile and impact strength of this grade is comparable to low carbon mild grades, but it has a higher fatigue strength than those grades. This grade is suitable for a range of demanding industrial applications, including shafts, studs, crane wheels, and machine parts.
This medium carbon steel grade can be induction hardened with a typical surface hardness of Rc 54 – Rc 60 depending on the quenching medium employed, workpiece size/shape and the quenching arrangements. This grade also benefits from a hard chrome plating, which provides added wear resistance, corrosion protection and decreases the coefficient of friction. However, it is important to note that this process doesn’t significantly alter the base hardness achieved through induction hardening. For this reason, it is recommended that the hard chrome plating is only applied to environments where the steel is not exposed to extremely corrosive conditions, which could compromise the integrity of the hard chrome layer.