What Is S275J0 Steel
S275J0 is a European non-alloy structural steel defined by EN 10025-2:2019, with a minimum yield strength of 275 MPa and guaranteed impact toughness of 27 J at 0 degrees C. The J0 suffix means a fully killed steel with a specified impact value at 0 degrees C.
The Most Direct Equivalents
Under GB/T 1591-2018, the direct Chinese equivalent is Q275C, with a minimum yield of 275 MPa and impact testing at 0 degrees C with at least 34 J, marginally stricter than the 27 J of S275J0. Under ISO 630-2:2021, the international equivalent is E275C, with the same strength and 0 degrees C impact requirements.
Other International Equivalents
ASTM A36 has similar strength, a yield of about 250 MPa, but no mandated impact test at 0 degrees C, so it is not a full equivalent for cold service; ASTM A709 Gr. 36 with Charpy requirements is the safer substitute in the American system. The former German DIN 17100 St44-2 is obsolete, and Japanese SS400 has a tensile requirement but no specified yield or low-temperature impact. The United Kingdom adopted the EN standards, so BS EN 10025-2 S275J0 is identical.
Key Substitution Principles
The J0 impact toughness at 0 degrees C is as important as the strength: a grade with correct strength but no toughness certification is not a safe substitute for exposed structures in cold climates. Chemical composition may differ between standards, affecting welding procedures, and substitution for critical projects must be based on certified mill test reports rather than cross-reference tables.
Applications
S275J0 is used for building frames, industrial platforms, and machinery supports in temperate climates where impact loading at moderate temperatures is a consideration, and is chosen specifically for verified performance at 0 degrees C.
Frequently Asked Questions
Q: What is S275J0 equivalent to?
A: Q275C per GB/T 1591-2018 and E275C per ISO 630-2:2021.
Q: What does J0 mean?
A: Fully killed steel with 27 J impact at 0 degrees C.
Q: What is the difference between J0 and J2?
A: J2 is tested at minus 20 degrees C.
Q: Is A36 a full equivalent?
A: No, it has no mandated 0 degrees C impact test.
Q: Can S275J0 be welded easily?
A: Yes, with a carbon content typically below 0.20 percent.
Q: What is the yield strength?
A: 275 MPa minimum up to 16 mm.
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