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Mild Steel S235JR
Material Type
Metal
Material Name
Mild Steel S275JR
Alternative Names
1.0044 | Fe430B | IS2062
Process Compatibility
CNC Milling, CNC Turning
introduction
Mild Steel S275JR in CNC Machining
S275JR is a non-alloy structural steel commonly delivered in hot-rolled or plate form. As a low-carbon steel, it offers moderate strength, good machinability, and ductility.
The “S” in S275JR means it is a structural steel grade, and “275” means it has a minimum yield strength of 275 N/mm². The "JR" designation indicates that the steel has been tested for longitudinal impact at 27J (Joules) at room temperature. S275JR is part of the EN 10025 standard, a European standard for hot-rolled structural steel products. It has good weldability, so it is easy to fabricate and assemble. That is also one of the reasons why it is used in various construction projects, including buildings, bridges, and machinery.
When CNC machining this material, we consider factors such as cutting speeds and feeds. We prefer to use carbide tools for their durability. We also use coolant and lubrication to help dissipate heat and improve tool life. We do proper workholding and optimize cutting conditions, tool changes, and surface finishes for quality results. Additionally, post-machining processes may be necessary depending on the specific application.
Properties
Properties Table of Mild Steel S275JR
| MECHANICAL PROPERTIES | |
|---|---|
| Ultimate Tensile Strength | 380-480 MPa |
| Yield Strength | 190-230 MPa |
| Young's Modulus(Elasticity) | 200 GPa |
| Elongation at Break | 12-20% |
| Physical Properties | |
| Corrosion Resistance | Poor |
| Magnetism | Generally non-magnetic |
| UV Resistance | Limited UV resistance |
| Weldability | Good weldability with proper procedures |
| Thermal Properties | |
| Maximum Service Temperature | Approximately 200°C(392°F) |
| Thermal Expansion Coefficient | 12.2 x 10^-6/°C(20-100°C) |
| Thermal Conductivity | 25 W/(m·°C) |
TECHNOLOGY OVERVIEW
Basic Knowledge of Mild Steel S275JR
What is Mild Steel S275JR?
S275JR steel is an easily weldable low-carbon manganese steel with good impact resistance. It is typically provided in untreated or normalized conditions.
It is known for its medium strength, high malleability, and ductility. Its chemical composition includes a maximum of 0.21% carbon, 1.50% manganese, and 0.40% silicon.
In addition to chemical composition, the material's mechanical properties, such as yield strength, tensile strength, and elongation, should also be considered when choosing S275JR for a particular application.
Advantages of Mild Steel S275JR
Good balance of strength and ductility.
Easily weldable using common methods.
Good machinability for cutting, drilling, and shaping.
Suitable for various applications, including construction and manufacturing.
Generally more cost-effective than other steel types.
Known for consistent and reliable mechanical properties.
Conforms to European and British standards.
Recyclable, aligning with environmental practices.
While not as corrosion-resistant as stainless steel, it can withstand certain conditions with proper protection.
Applications of Mild Steel S275JR
Machinery components
Support structures in roadways
Platforms in railways and airports
Chassis construction
Construction of pipelines
Production of brackets and supports
Various engineering components
Ship components and structures
Bridges in railway construction
Components for agricultural machinery
FAQ
Machining Mild Steel S275JR Buying FAQ
S235JR has a minimum yield strength of 235 N/mm², while S275JR has a minimum yield strength of 275 N/mm². Therefore, S275JR is stronger than S235JR.
S275 is a general purpose structural steel grade, while S275JR is a specific grade with additional requirements for impact testing. The "JR" designation indicates that the steel has undergone a Charpy V-notch impact test at 27 Joules at room temperature. This test ensures that the steel possesses good notch toughness.
The hardness of steel is typically measured by its tensile strength, and S355 generally has a higher tensile strength than S275. Therefore, S355 is considered harder in terms of its resistance to deformation under applied force.
Other Materials
Mild Steel S355J2
Mild Steel S355J2 is a low-carbon structural steel with excellent weldability and machinability.
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Mild Steel S235JR
Mild Steel S235JR is a low-carbon structural steel with good weldability and machinability.
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Mild Steel A36
Mild steel A36 is a popular type of structural steel in manufacturing and machining because it is easy to work with and cost-effective.
More info about Mild Steel A36
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