S275J2 vs S275JR
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
S275J2
Structural & HSLA Steel
S275J2 is the low-temperature quality of the S275 family to EN 10025-2: same 275 MPa yield as S275JR, but with Charpy toughness guaranteed at −20 °C and tighter phosphorus/sulfur limits. It is the default step up when S275 plate or sections work outdoors in cold climates.
Standards: DIN 1.0145 (S275J2) · AISI A572 Gr.42 (near) · JIS SM490A (near) · GB Q275 class (near)
S275JR
Structural & HSLA Steel
S275JR is the middle step of the EN 10025-2 structural family, offering about 17% more yield strength than S235JR at a small price premium. It is a common choice where S235 is marginally too weak but S355 is not needed.
Standards: DIN 1.0044 (S275JR) · AISI A572 Gr.42 (near) · JIS SS490 (near) · GB Q275 (legacy, near)
Chemical composition compared (%)
| Element | S275J2 | S275JR |
|---|---|---|
| C | ≤0.17 | ≤0.21 |
| Mn | ≤1.50 | ≤1.50 |
| P | ≤0.025 | ≤0.035 |
| S | ≤0.025 | ≤0.035 |
| N | ≤0.012 | — |
| Cu | ≤0.55 | ≤0.55 |
Properties compared
| Property | S275J2 | S275JR |
|---|---|---|
| Yield strength | ≥275 MPa (≤16 mm) | ≥275 MPa (≤16 mm) |
| Tensile strength | 410–560 MPa | 410–560 MPa |
| Impact | 27 J at −20 °C | JR: 27 J at 20 °C |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: S275J2 · S275JR. Substitution decisions for certified parts stay with the design authority.