EN S275JR steel
Non-alloy structural steel: thickness-dependent strength, JR impact-test scope, delivery conditions and procurement boundaries.
Tags: materials, steel, structural-steel
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Identity and specification edition
Tata Steel UK's EN 10025-2:2004-basis hot-rolled table gives 275 MPa minimum upper yield or 0.2% proof stress through 16 mm and 265 MPa above 16 through 20 mm, on transverse specimens. JR denotes 27 J at +20°C. Tata states that JR impact verification must be requested at enquiry or order and limits its stated values to above 6 mm with standard specimens. Tata steel properties, thyssenkrupp JR grade data
S275JR, material number 1.0044, is a non-alloy structural steel associated with EN 10025-2. The grade's strength number is not a constant yield requirement for every thickness. BSI identifies BS EN 10025-2:2019 as its current release, published 19 August 2019, replacing its 2004 edition. Thyssenkrupp grade identity, BSI edition record
Bounded hot-rolled product example
Tata Steel UK's published S275JR/J0/J2 table explicitly uses an EN 10025-2:2004 basis. It gives strength and elongation for transverse specimens and impact results for specimens taken along the rolling direction:
| Property | Thickness t, mm | Published value |
|---|---|---|
| Minimum upper yield strength or 0.2% proof stress | t ≤16 | 275 MPa |
| Minimum upper yield strength or 0.2% proof stress | 16 < t ≤20 | 265 MPa |
| Tensile strength | t <3 | 430–580 MPa |
| Tensile strength | 3 ≤t ≤20 | 410–560 MPa |
| Elongation | 3 ≤t ≤20 | 21% |
These are producer table requirements with a historical standard basis, not a transcription of the complete 2019 standard or a certificate for every product. The table's other elongation entries vary with thinner gauges; do not extend the 21% row to all thicknesses. Tata Steel UK, S275 properties and footnotes
What JR does and does not establish
Thyssenkrupp's grade description gives 27 J at +20°C for S275JR. Tata's table distinguishes JR/J0/J2 at +20/0/−20°C and states that its JR impact properties are verified only when specified at enquiry or order. Its stated impact values apply to thickness above 6 mm and standard test pieces. Thyssenkrupp grade description, Tata impact qualifications
Do not translate a Charpy test temperature into a universal minimum service temperature. The component assessment also depends on thickness, stress state, welding details, loading and the applicable design rules. Specify test temperature, specimen size/orientation, sampling and acceptance evidence where toughness matters. A tensile test or the letters JR alone do not prove that a particular shipment received the required impact test.
Delivery condition and fabrication
Tata asks buyers to specify normalized rolling +N or cold-forming suitability C when required. Its guidance says cold forming is not guaranteed for structural steel that was not specified as cold-formable. Tata delivery-condition guidance
Resolve forming direction, radius, edge condition, springback and final dimensional acceptance for the actual stock. For welding, establish the procedure for the thickness, joint, restraint and service; use actual heat chemistry where the procedure requires it. The grade label does not supply a universal preheat, consumable or heat-input instruction.
Thyssenkrupp's separate declaration of performance for hot-rolled S275JR strip identifies welded, bolted and riveted structures as the intended use. It declares CEV ≤0.40% within its stated product/thickness scope. This is a named producer declaration, not the chemistry of an unidentified S275JR part or a complete welding procedure. Thyssenkrupp declaration of performance
Review hot forming, thermal straightening, repair welds and later heat treatment before fabrication when they can alter the supplied condition. Define surface preparation and corrosion protection separately from the structural grade.
Calculation example and release record
Original nominal-stress example: a uniform 200 mm² section carrying 10,000 N has σ = 10000 / 200 = 50 MPa. Relative to the cited thin-product minimum, 50 / 275 ≈0.182; relative to the 16–20 mm row, 50 / 265 ≈0.189. Neither ratio is a code utilization or safety factor. Buckling, fatigue, connections, local stresses, load combinations and resistance factors are excluded.
Source versions
BSI's record identifies the 2019 release; Tata's live table explicitly retains a 2004 technical basis. Thyssenkrupp's inspected declaration carries identifier WB-UKCA-0011-2005-10051-S275JR-TKSE-15032023 despite a URL ending in 01012022. No separate technical revision date was verified for the live grade pages. Confirm the order's required editions and current producer commitments independently.