Gangsteel supplies EN 10025-2 S355JR steel plate for bridge components, machinery frames and load-bearing welded structures where the design specifies this strength class and impact quality. S355JR is a non-alloy structural steel designation, combining a nominal yield class with a defined toughness quality. We coordinate project requirements and plate supply within the EN 10025-2 steel plate family.
The number 355 identifies minimum yield strength in MPa only for nominal thickness up to 16 mm; thicker plate has lower specified minima. JR denotes impact quality, not an additional tensile-strength grade. JR impact verification is performed only when specified at the time of order; do not assume every JR plate has been impact tested.
Grade Designation
- EN 10025-2:2019 — technical delivery conditions for non-alloy structural steels.
- S355 — structural steel in the 355 MPa nominal minimum yield class at thickness ≤16 mm.
- JR — impact-quality designation; see the thickness-banded Charpy table below.
- Steel number 1.0045 — current 2019 numerical designation of S355JR.
Common written forms include EN10025-2 S355JR and EN 10025-2 S355JR. Use the complete grade, standard edition and delivery condition on the purchase order.
Key Advantages of EN 10025-2 S355JR Steel Plate
- Defined 355 MPa nominal yield class with thickness-dependent acceptance requirements.
- JR impact quality explicitly separated from the tensile-strength class.
- Delivery-condition review keeps the rolling route aligned with the purchase specification.
- Heat analysis and mechanical acceptance values linked to a stated standard edition.
- Gangsteel coordinates plate enquiries, dimensional requirements and export documentation against the agreed order.
- Processing requirements, including cutting allowances and drawing details, can be reviewed at enquiry without assuming a universal fabrication procedure.
Chemical Composition (Heat Analysis, Maximum %)
EN 10025-2:2019, Table 1: heat-analysis limits for current S355JR flat products. The +N delivery option does not create a separate chemistry table.
| Element / nominal thickness | Maximum, mass % |
|---|---|
| C, ≤400 mm | 0.24 |
| Si | 0.55 |
| Mn | 1.60 |
| P | 0.035 |
| S | 0.035 |
| N | 0.012 |
| Cu | 0.55 |
| Ni | 0.42 |
| Cr | 0.29 |
| Mo | 0.11 |
A dash means no numerical limit is listed for that entry in Table 1; it does not mean zero content or exemption from all chemical requirements. Ni, Cr and Mo limits follow Table 1 footnote l. These are heat-analysis limits, not typical analyses; product-analysis tolerances are separate. Long-product phosphorus and sulfur allowances are not used for these flat-product tables.
The nitrogen maximum does not apply if total Al is at least 0.020%, acid-soluble Al is at least 0.015%, or sufficient other nitrogen-binding elements are present. The nitrogen-binding elements must then be identified in the inspection document.
Mechanical Properties
Current-standard basis: EN 10025-2:2019, Table 6, S355JR, flat products of width ≥600 mm. The values apply to the underlying quality and do not increase when +N is selected.
| Nominal plate thickness | Yield ReH min, MPa | Tensile Rm, MPa | Transverse A min, % |
|---|---|---|---|
| 3–16 mm | 355 | 470–630 | 20 |
| >16–40 mm | 345 | 470–630 | 20 |
| >40–63 mm | 335 | 470–630 | 19 |
| >63–80 mm | 325 | 470–630 | 18 |
| >80–100 mm | 315 | 470–630 | 18 |
| >100–150 mm | 295 | 450–600 | 18 |
| >150–200 mm | 285 | 450–600 | 17 |
| >200–250 mm | 275 | 450–600 | 17 |
| >250–400 mm | 265 | 450–600 | 17 |
This table deliberately covers plate thickness ≥3 mm. Elongation uses the proportional gauge length L₀ = 5.65√S₀. For plate, strip and wide flats of width ≥600 mm, Table 6 specifies the transverse tensile-test direction; narrower products use the applicable longitudinal requirements, including different elongation values. Confirm the ordered thickness, orientation, delivery condition and all acceptance values on the mill certificate / inspection document.
| Nominal flat-product thickness | Charpy test temperature, °C | Longitudinal KV2 minimum average, J |
|---|---|---|
| ≤150 mm | +20 | 27 |
| >150–250 mm | +20 | 27 |
| >250–400 mm | +20 | 27 |
Impact values follow EN 10025-2:2019, Table 8, for full-size longitudinal Charpy V-notch specimens. JR impact properties are verified only when specified at the time of order. Acceptance uses the average of three tests with the standard’s individual-result and retest rules. Subsize energies are reduced in proportion to specimen cross-sectional area; below 6 mm nominal thickness no impact tests are required for flat products under Clause 9.2.3.3. A Charpy test temperature is not an approved minimum service temperature.
Delivery Condition and Fabrication
Under EN 10025-2:2019, Clause 6.3, +AR means as rolled, +N means normalized or normalized rolled, and +M means thermomechanically rolled. For quarto plate the permitted delivery choices are +AR or +N; +M is an option for long products and hot-rolled strip, not a general quarto-plate option. Unless otherwise agreed, selection is at the manufacturer’s discretion within those limits. State the required condition on the order and inspection document.
Welding, forming, flame straightening and subsequent heat treatment require a procedure suited to the actual heat chemistry, thickness, restraint and project code. Gangsteel does not infer a universal preheat, welding procedure or heat-treatment cycle from the designation alone.
Carbon Equivalent
| Nominal thickness | Maximum heat-analysis CEV, % |
|---|---|
| ≤30 mm | 0.45 |
| >30–40 mm | 0.47 |
| >40–150 mm | 0.47 |
| >150–250 mm | 0.49 |
| >250–400 mm | 0.49 |
Base limits are from EN 10025-2:2019, Table 5, for current S355JR flat products. CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. The agreed copper-alloyed option in Clause 7.2.4 increases the tabulated maximum by 0.02. For controlled-silicon S275/S355 orders under Clause 7.2.5, the stated adjustments are +0.02 at Si ≤0.04% or +0.01 at Si ≤0.25%, as applicable; these two silicon adjustments are alternatives, not cumulative. Confirm the applicable order options and actual heat CEV before fabrication; these limits are not a welding procedure.
Impact Quality Comparison
| Current quality | Test temperature, °C | Longitudinal KV2 at ≤150 mm, J | Longitudinal KV2 at >150–400 mm, J |
|---|---|---|---|
| S355JR | +20 | 27 | 27 |
| S355J0 | 0 | 27 | 27 |
| S355J2 | −20 | 27 | 27 |
| S355K2 | −20 | 40 | 33 |
Comparison basis: EN 10025-2:2019, Tables 6 and 8. Qualities within a strength class share the tensile table; this comparison does not override differences in chemistry, testing, delivery condition or order options. JR testing remains order-dependent. The quality comparison is not a stock list or substitution approval.
Available Dimensions
- Current S355JR flat-product scope in EN 10025-2:2019 extends to nominal thickness 400 mm; the displayed tensile table covers 3–400 mm. This is standard coverage, not a mill stock range.
- Actual thickness × width × length and dimensional tolerances must be agreed for the selected mill and project.
- Provide quantity, delivery condition, inspection requirements and processing allowance. Exact availability is confirmed against the enquiry, not assumed from the grade name.
Main Applications
- Bridge and building structural components subject to the applicable design code.
- Heavy support members, machinery frames and welded equipment structures.
- Project-specific assemblies whose design specifies the stated impact quality and delivery condition.
Application suitability depends on design temperature, stress state, thickness, fatigue, fabrication and construction-code requirements. This structural-steel designation is not automatic approval for pressure-vessel service.
Equivalent Grades of EN 10025-2 S355JR
No direct cross-standard equivalent is asserted for EN 10025-2 S355JR. A matching strength number does not establish equivalence; any substitute requires designer and purchaser approval after comparing the contractual edition, product form, chemistry, thickness-dependent strength, toughness, delivery condition and inspection requirements.
Related official articles: EN 10025-2 S355J0, EN 10025-2 S355J2, EN 10025-2 S355K2. JR, J0, J2 and K2 identify different impact qualities within the S355 strength class; they are not different tensile-strength classes.
DIN 17100 ST52-3 / ST52-3N is a withdrawn legacy structural-steel reference related to the S355 family, not an unconditional equivalent. EN 10025-3 S355N and EN 10025-3 S355NL are separate normalized fine-grain grades, not alternate spellings of S355J2+N or S355K2+N.
Related Products
- EN 10025-2 steel plate — family page
- EN 10025-2 S235JR steel plate
- EN 10025-2 S235J0 steel plate
- EN 10025-2 S235J2 steel plate
- EN 10025-2 S275J0 steel plate
- EN 10025-2 S275J2G3 steel plate
- EN 10025-2 S355J0 steel plate
- EN 10025-2 S355J2 steel plate
- EN 10025-2 S355J2+N steel plate
- EN 10025-2 S355J2G3 steel plate
- EN 10025-2 S355K2 steel plate
- EN 10025-2 S355K2+N steel plate
- EN 10025-2 S355K2G3 steel plate
- EN 10025-2 S355K2N steel plate
- EN 10025-2 S450J0 steel plate
- Low-alloy and high-strength steel plate
- EN 10025-3 normalized fine-grain steel plate
- EN 10025-3 S355N
- EN 10025-3 S355NL
- DIN 17100 steel plates — legacy family
- DIN 17100 ST52-3 / ST52-3N
Frequently Asked Questions (FAQ)
What is EN 10025-2 S355JR (EN10025-2 S355JR) steel plate?
It is a non-alloy structural steel of the 355 MPa nominal yield class with JR impact quality. The complete thickness-dependent strength requirements and ordered delivery condition are essential parts of the specification.
Does EN 10025-2 S355JR have one yield value at every thickness?
No. The minimum is 355 MPa through 16 mm, falling to 265 MPa above 250–400 mm in the 2019 flat-product table. The displayed elongation and tensile values also follow their own thickness bands.
What impact test applies to EN 10025-2 S355JR?
The underlying current S355JR quality uses longitudinal Charpy testing at +20 °C: 27 J minimum average in the displayed flat-product thickness bands. JR verification must be specified at order. These full-size requirements are subject to specimen-size and inspection rules, not a minimum service-temperature rating.
Which delivery condition should be ordered for EN 10025-2 S355JR?
Specify the required condition instead of assuming it from the impact suffix. Current quarto plates permit +AR or +N; +M is provided for long products and hot-rolled strip, not as a general quarto-plate option.
Can another grade replace EN 10025-2 S355JR?
Only with designer and purchaser approval. Compare the complete specification, product form, edition, chemistry, thickness-dependent strength, toughness, delivery condition and inspection. Similar names or nominal strength do not authorize substitution.
Can EN 10025-2 S355JR be welded and processed?
Fabrication must be assessed against the actual material certificate, thickness, joint design and applicable code. Agree drawing details and processing allowances at enquiry; no universal welding, preheat or heat-treatment procedure is implied.
What should an enquiry for EN 10025-2 S355JR include?
Provide the standard edition, full designation, product form, delivery condition, thickness × width × length, quantity, impact requirements, inspection documentation and processing drawings. Gangsteel will review the technical basis and confirm exact dimensions, availability, price and delivery against the enquiry.
For EN 10025-2 S355JR steel plate supply and technical enquiries, please contact Gangsteel with your specification, dimensions and quantity.