S355JR and S355J0 are steel materials that belong to the S355 series, which are structural steels commonly used in construction and engineering applications. While they share some similarities, there are notable differences between S355JR and S355J0.

S355JR: The "JR" in S355JR stands for "Junior," indicating its lower Charpy V-notch impact requirements. It has a maximum carbon content of 0.24% and is primarily composed of iron, manganese, carbon, silicon, phosphorus, sulfur, and trace amounts of other elements.

S355J0: In comparison, S355J0 does not have any specific impact requirements denoted in its grade name. It has a maximum carbon content of 0.22% and contains similar elements to S355JR, including iron, manganese, carbon, silicon, phosphorus, sulfur, and additional trace elements.

S355JR: This grade has a minimum yield strength of 355 megapascals (MPa) and a minimum tensile strength of 470-630 MPa. It offers good weldability, machinability, and formability.

S355J0: S355J0 also has a minimum yield strength of 355 MPa, but its minimum tensile strength is slightly lower, ranging from 470-630 MPa. Like S355JR, it exhibits good weldability, machinability, and formability.

S355JR: Due to its Junior status and impact requirements, S355JR is often used in general structural engineering projects and low-load-bearing applications.

S355J0: S355J0, on the other hand, is typically utilized in higher-strength structural engineering applications and more demanding environments. It is suitable for constructing heavy-load-bearing structures, bridges, offshore structures, and power plants.

Opt for S355JR if:

Project in warm/moderate climates (rarely <5°C)

Budget constraints are significant

Application doesn't require cold weather performance

Opt for S355J0 if:

Structure will be exposed to temperatures near 0°C

Located in regions with mild winters

Design requires enhanced resistance to brittle fracture

Slight premium acceptable for improved low-temperature performance

While both S355JR and S355J0 are structural steels with similar chemical compositions, the key difference lies in their impact requirements and usage scenarios. S355J0 possesses slightly stronger mechanical properties, making it suitable for applications requiring higher strength. It is essential to consider the specific project requirements and consult relevant design codes or engineering professionals to determine the most appropriate steel material for a particular application.

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FAQ

What is S355JR equivalent to?

S355JR equivalent grades have very close chemical composition and mechanical properties to that of S355JR steel. Both the S355JR equivalent grades Q345B, A572 Gr 50, ST52-3, SM490B and S355JR steel are main products of BBN steel.

What is structural steel grade S355JR?

S355JR steel has a high strength-to-weight ratio, making it suitable for use in load-bearing structures such as bridges, buildings, and offshore structures. It has a minimum yield strength of 355 N/mm², making it one of the strongest steel grades available.

What is the difference between S355JR and J2?

In S355JR and S355J2 steel, JR and J2 indicates the steel needs to do +20℃ impact test and -20℃ impact test respectively. The different impact temperature is the main difference between S355JR and S355J2 steel. S355J2 steel can better adapt to low temperature work condition than S355JR steel.

What does JR mean in steel?

The J means that the test was conducted with 27 joules of energy. This is followed by either an R for room temperature, or a number referring to the temperature the tests were conducted at. So JR is room temperature (plus 20 degrees) J0 is 0 degrees and J2 is -20 degrees.

Is S355 better than S275?

This grade of steel is stronger than its S275 counterpart with a minimum yield strength of 355 N/mm2 resulting in its S355 name. This grade is also available in plate, round bar, flat bar, and is even available in blocks.

What is the hardness of S355 jr?

Grade S355JR has a minimum yield strength of 355 MPa. The impact energy at a room temperature of 20°C is at least 27 joules.

What is S355 steel used for?

This structural steel is used in shipbuilding and railway vehicle construction. S355 steel also finds optimal application for the construction of machinery such as cranes and excavators, as well as in building and piping construction, ventilation systems and pumps.

What is the price of S355JR per kg?

Mild Steel, Grade: S355JR – 0.61 USD/kg | 610 USD/ton

What is the difference between S275JR and S355JR?

S275JR is carbon steel, while S355JR is low alloy steel. Both carbon steel S275JR and S355JR low alloy steel are under EN10025-2 standard. The S355JR low alloy steel is higher steel grade than carbon steel S275JR.