The primary difference between S275JR and S275JO steel grades lies in their impact testing requirements, which affects their suitability for use in different environmental conditions.
S275 and S275JR steel chemical composition - ladle analysis:
| Steel Grade | С | Mn | S | P | N | Сu | |
| S275 | JR | <=0.22 | <=1.50 | 0.035 | 0.035 | <=0.012 | <=0.55 |
| J0 | <=0.18 | <=1.50 | 0.03 | 0.03 | <=0.012 | <=0.55 | |
| J2 | <=0.18 | <=1.50 | 0.025 | 0.025 | - | <=0.55 | |
S275 and S275JR steel mechanical properties:
| Grade | Min. Yield strength (t≤16mm) |
Tensile strength (t≤400mm) |
Elongation A (3mm≤t≤40mm) min |
Temperature/℃ | Impact energy (Longitudinal)/J min |
|
| S275 | JR | 275 Mpa | 380-580 Mpa | 15% | 20 | 27 |
| J0 | 275 Mpa | 380-580 Mpa | 15% | 0 | 27 | |
| J2 | 275 Mpa | 380-580 Mpa | 13% | -20 | 27 | |
Key Differences
Impact Testing Temperature:
S275JR: Tested at room temperature (20°C). It does not have additional requirements for impact toughness at lower temperatures, making it suitable for standard applications with minimal exposure to low temperatures.
S275JO: Tested at 0°C for impact toughness, it has been verified to withstand tougher conditions at colder temperatures than S275JR. This makes S275JO more suitable for applications in colder climates or in structures where extra resilience at lower temperatures is beneficial.
Mechanical Properties:
Both S275JR and S275JO have similar mechanical properties, including a minimum yield strength of 275 MPa. They are used in structural applications but differ in environmental suitability due to the impact testing requirements.
Application Suitability:
S275JR: More commonly used for general structural applications, where there are fewer concerns about cold temperatures.
S275JO: Often chosen for structures exposed to cooler environments, as it can better endure impact at low temperatures without becoming brittle.
In summary, while both grades are suitable for general structural purposes, S275JO is preferred in colder environments due to its verified toughness at 0°C, while S275JR is typically adequate for standard conditions.
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FAQ
Q: What is S275 steel used for?
A: S275 is a very popular low carbon steel grade suitable for numerous general engineering and structural applications. Supplied as a hot rolled non alloy steel it is used widely in the construction, maintenance and manufacturing industries.
Q: What is the difference between S275 and S275JR?
A: The only difference between the two is that S275JR plate has been impact tested at 27 Joules at room temperature, while S275 plate has not. This means that S275JR plate is more suitable for structural applications that require higher impact S275JR plate yield strength.
Q: What is the strength of S275JR steel?
A: 275 MPa
Grade S275JR has a minimum yield strength of 275 MPa. The impact energy at a room temperature of 20°C is at least 27 joules.
| Other steel plate | ||||
| Name | Material | Specification (mm) | Tons | Remark |
| 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 |
