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S275JR is a type of steel defined by the European standard EN 10025. The letter "S" stands for "Structural Steel," while the number "275" indicates the minimum yield strength of the steel in MPa (megapascals). "JR" means that the steel has a specific impact toughness at room temperature. St44 is the equivalent of this steel in the former German standard, and 1.0044 is the international material number for this steel.
S275JR:
The letter "S" stands for "Structural Steel."
The number "275" indicates the minimum yield strength, which is 275 MPa (megapascals).
The symbol "JR" refers to the steel’s toughness and impact resistance. "JR" means that the steel achieves a specific toughness in a Charpy impact test at 20°C.
S275JR (St44):
The letter "St" stands for "Steel."
The number "44" indicates the minimum yield strength in kilograms per square millimeter (kg/mm²). Under the old German standard, 44 kg/mm² corresponds to approximately 430-440 MPa (megapascals). This value describes the strength and durability of the steel.
The German DIN standard was frequently used before the harmonization of European steel standards. The DIN 17100 standard defined various structural steel grades, with St44 being part of this standard. The DIN 17100 standard has been largely replaced and updated by the European standard EN 10025, which led to St44 being renamed to S275JR.
St44 and S275JR are largely identical in chemical composition and mechanical properties. Both steel grades are used in similar applications and share the same durability and strength. However, due to alignment with European standards (EN 10025), the term S275JR is more commonly used in projects and international trade.
The S275JR (St44) – 1.0044 steel is a low-alloy structural steel widely used in structural and engineering projects. With a minimum yield strength of 275 MPa, it offers high strength and has a tensile strength of 370-530 MPa. The chemical composition includes a maximum of 0.24% carbon, 1.60% manganese, and 0.55% silicon, which makes it both strong and machinable. The steel’s impact toughness has been determined at room temperature in the Charpy-V notch impact test with a minimum of 27 joules, indicating high fracture toughness. With an elongation of 20-23%, S275JR steel offers good ductility and formability. Due to its good weldability, it is easily applicable in various construction and engineering projects.
Overall, S275JR steel is a reliable and versatile material widely used in construction, bridge building, machinery manufacturing, and the automotive industry.
S275JR steel is a widely used material across various industries due to its low carbon structure, high strength, and good machinability. It is commonly applied in the construction and building industry, as well as in the production of steel components, machinery, equipment, agricultural machinery, industrial equipment, transport and logistics sectors, the energy and power industries, as well as in infrastructure and general industrial applications. Additional uses include safety fences, railings, modular structures, prefabricated houses, offices, and temporary buildings.
S275JR has different designations across countries and standards. In the German standard (DIN), it is known as St44, while in the USA, it is referred to as A283D and A529 Gr.D.
|
EN / EU |
Germany / DIN |
USA |
|
S275JR |
St44 |
A283D, A529 Gr.D |
Mechanical Properties of S275JR Steel
Yield Strength: The minimum yield strength of S275JR steel is 275 MPa. This indicates the maximum stress the steel can withstand without undergoing plastic deformation.
Tensile Strength: Tensile strength is the maximum stress that the steel can withstand before breaking. For S275JR steel, the tensile strength typically ranges between 370-530 MPa.
Impact Strength: The "JR" code means that the steel can absorb at least 27 Joules (J) of energy in the Charpy V-notch impact test at 20°C.
Elongation: The minimum elongation value of S275JR steel typically ranges between 20-23%, indicating how much the steel can stretch before breaking, and demonstrating the steel's ductility.
Hardness: The hardness of S275JR steel is typically measured on the Brinell hardness scale (HB), and it generally ranges between 135 and 175 HB.
S275JR (St44) – 1.0044 is a low-carbon structural steel that is commonly used in construction and engineering projects. The chemical composition of this steel plays a crucial role in its mechanical and physical properties. The chemical components influence the strength, durability, machinability, and weldability of the steel.
The chemical composition of S275JR steel consists of a mixture of various elements in specific proportions, which determine the steel’s mechanical properties.
|
Element |
C |
Mn |
Si |
P |
S |
|
Max (%) |
0.24 |
1.60 |
0.55 |
0.045 |
0.045 |
Hasçelik offers competitive prices for S275JR steel. The company minimizes production costs and increases efficiency to provide attractive prices for its customers.
Customer-Oriented Service: Hasçelik offers flexible pricing and payment options tailored to customer needs. With a focus on customer satisfaction, the company aims to build long-term business relationships. Hasçelik adapts to market conditions while providing its customers with the best prices.
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