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Tay Ninh Province, Vietnam
Structural steel · Grade equivalents
Structural steel grades compared – ASTM, AS/NZS, EN, JIS and GB
Projects are designed to one standard and often supplied from mills that roll to another. This reference shows the nearest structural steel grades across the five standards World Steel works with every day – and what to check before one grade replaces another.
- S355 ≈ Gr 50 ≈ 350 ≈ SM490 ≈ Q355
- The workhorse grades ≈ 345–355 MPa
- 5 standards
- US · AU · EU · JP · CN one table
- Toughness
- Must be matched test temperature & energy
- Engineer approval
- For every substitution project spec governs
Sections and plate
Hot-rolled sections and built-up members
See the nearest UB, UC and PFC equivalents in IPE, HE and W shapes, our plate grades and hollow sections, and when a built-up member beats a hot-rolled section.
Strength classes
Nearest equivalent grades
By minimum yield strength for thin material. Not identical – toughness, chemistry, tolerances and thickness ranges differ.
| Yield class | USA · ASTM | Australia · AS/NZS | Europe · EN | Japan · JIS | China · GB |
|---|---|---|---|---|---|
| 235 – 250 MPa | A36 | Grade 250 | S235JR | SS400 · SM400 · SN400 | Q235B |
| 275 – 300 MPa | — | Grade 300 | S275JR / J0 | — | Q275 |
| 345 – 355 MPa | A572 Gr 50 · A992 (sections) | Grade 350 | S355J2 | SM490 · SN490 | Q355B/C/D |
| 415 – 420 MPa | A572 Gr 60 | Grade 400 | S420M | — | Q420 |
| 450 – 460 MPa | A572 Gr 65 | Grade 450 | S460N / M | SM570 | Q460 |
| ≈ 690 MPa (Q&T) | A514 | AS 3597 Grade 700 | S690Q | SHY685 | Q690 |
| Weathering ≈ 350 MPa | A588 · A709 50W | WR350 | S355J2W | SMA490 | Q355NH |
| USA | Australia | Europe | Japan | China |
|---|---|---|---|---|
| A500 Gr C · A1085 | C350L0 | S355J2H | STKR490 · BCR295 | Q355 (GB/T 6728) |
Toughness
Impact test sub-grades
Charpy V-notch test temperature – choose by service temperature and plate thickness.
| Test temperature | EN 10025 | AS/NZS | JIS | GB |
|---|---|---|---|---|
| +20 °C | JR | — | B (SM490B at 0 °C) | B |
| 0 °C | J0 | L0 | B / C | C |
| −15 / −20 °C | J2 · K2 | L15 (−15 °C) | — | D |
| −50 °C | NL · ML | Y40 / L50 grades | — | E |
프로세스
Substituting one standard for another
- 1
Strength
Compare minimum yield and tensile strength at the actual thickness – values drop with thickness and differ between standards.
- 2
Toughness
Match or exceed the Charpy energy and test temperature required by the design.
- 3
Chemistry & weldability
Check carbon equivalent and the welding procedures qualified for the grade.
- 4
Dimensions & tolerances
Section sizes and rolling tolerances differ – see the hot-rolled section equivalents.
- 5
Approval
Submit the substitution to the engineer of record; record it in the material schedule.
- 6
Certification
Deliver with EN 10204 3.1 certificates traceable to the heat number.
FAQ
자주 묻는 질문
Is S355 the same as A572 Gr 50?
They are the nearest equivalents (355 vs 345 MPa minimum yield) but not identical – toughness requirements, chemistry limits and thickness ranges differ.
What replaced Q345 in China?
GB/T 1591-2018 replaced Q345 with Q355, aligning the yield strength with S355.
Is SS400 equivalent to S275 or S235?
SS400 has a minimum yield of 245 MPa for thin material – between S235 and S275 – and limited chemistry control; for welded structures SM400 or SN400 is preferred.
관련 콘텐츠
레퍼런스 프로젝트
Ho Chi Minh City, Vietnam
Tan Uyen Nam Son Factory
Ho Chi Minh City, Vietnam
An Phu 3S Hyundai
Need a grade substitution checked?
Send the specification and the proposed grades – our engineers prepare the comparison for approval.