S275JR and S355JR steel are low alloy steel materials under standard EN10025-2. In the steel grades, "S" means structure steel, the number "275" and "355" means the Min. yield strength of S275JR and S355JR steel are 275Mpa and 355Mpa respectively. "JR" indicates the steel needs +20℃ impact test.
Chemical Composition: S275JR vs S355JR
The chemical composition of S275JR and S355JR is similar, as both are low-carbon steels designed for structural use. However, subtle differences in their composition can influence their performance:
| Grade | C (t≤16mm) | Si | Mn | P | S | Cu | N |
| S275JR | 0.24 max | - | 1.60 max | 0.045 max | 0.045 max | 0.60 max | 0.014 max |
| S355JR | 0.27 max | 0.6 | 1.70 max | 0.045 max | 0.045 max | 0.60 max | 0.014 max |
Mechanical Properties
The primary distinction between S275JR and S355JR lies in their yield strength and tensile strength, which directly impact their suitability for different applications.
| Grade | Yield strength ReH/(N/mm2) (t≤16mm) min | Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) | Elongation A/%(3mm≤t≤40mm) min | Charpy V test | |
| Temperature/℃ | Impact energy (Longitudinal)/J min | ||||
| S275JR | 275 | 410-560 | 23 | 20 | 27 |
| S355JR | 355 | 470-630 | 22 | 20 | 27 |
Applications of S275JR and S355JR Steel
The choice between S275JR and S355JR depends on the specific requirements of your project, including load-bearing needs, structural design, and budget constraints.
S275JR Steel Applications
Lightweight structures: Used in residential buildings, small bridges, and warehouses where moderate strength is sufficient.
General fabrication: Ideal for components like beams, columns, and trusses in low-to-medium load applications.
Cost-sensitive projects: Preferred when cost is a primary concern, as S275JR is typically less expensive than S355JR.
S355JR Steel Applications
Heavy-duty structures: Employed in high-rise buildings, large bridges, and industrial facilities requiring higher strength and durability.
Infrastructure projects: Used in railway bridges, offshore platforms, and other structures subject to significant loads.
High-load components: Suitable for heavy machinery frames, crane booms, and structural supports in demanding environments.
GNEE steel has been engaged in steel materials for more than 17 years. For any information about carbon steel S275JR and S355JR low alloy steel, such as carbon steel S275JR chemical composition, S355JR low alloy steel mechanical property, carbon steel S275JR specification, S355JR low alloy steel data sheet, carbon steel S275JR and S355JR low alloy steel price, please feel free to consult GNEE steel.
GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to info@gneesteels.com. You are welcome to consult us, and we are very willing to answer your questions.
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.
| Other steel plate | ||||
| Name | Material | Specification (mm) | Tons | Remark |
| Clad steel plate | P265GH+410,S355JR+410,A516Gr70+316, A537CL1+304L,Q235B+304L,Q345B+304, A516Gr70(NACE)+410,A537CL1+904L, A537CL1+316L,A516Gr70+304L,A537CL1+304 ,A516Gr70+410,A516Gr70+904L |
2-300mm(Based plate),1-50mm(Composited plate) | / | UT, AR, TMCP.Normalized, Quenched and Tempered,Z Direction Test, Charpy V-Notch impact TestThe Third Party Test , Coated or Shot Blasting and Painting. |
| Low Alloy | Q345A, Q345B, Q345C, Q345D, Q345E, Q390, Q420, Q460C, ST52-3, S355J2+N, SS400, SA302GrC, S275NL, 35CrMo | 6 - 350 | 5788.56 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| Pressure Vessel Plate | Q245R, Q345R, Q370R, 16MnDR, 09MnNiDR, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R, SA516Gr60, SA516Gr70, SA516Gr485, SA285, SA387Gr11, SA387Gr12, SA387Gr22, P265,P295,P355GH,Q245R(R-HIC),Q345R(R-HIC) | 3 - 300 | 8650 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| High-Strength Plate | WH785D/E,Q960D/E, Q890D/E,WH60D/E,WH70B,Q550D,Q590D,Q690D/E | 8 - 120 | 3086.352 | Quenched and tempered |
| Wear-Resistant Plate | NM360, NM400, NM450, NM500 | 6 - 150 | 3866.297 | Quenched and tempered |
| Bridge Plate | Q235qC, Q345qC, Q370qC, Q420qC, Q345qDNH, Q370qDNH, A709 - 50F - 2, A709 - 50T - 2 | 8 - 200 | 2853.621 | Hot rolling, normalized ,hot rolling controlled rolling, quenched and tempered + toughness and brittleness |
