A572 Grade 50 equivalent grades: ASTM, EN, JIS, GB, DIN
A572 Grade 50 is high-strength low-alloy (HSLA) columbium-vanadium structural steel specified in ASTM A572. Substitutes are collected here from 6 standard systems; the grading column says whether a certificate covers the swap or an engineer has to. The full A572 Grade 50 data sheet carries the composition and mechanical tables.
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A572 Grade 50 is cross-certified with A992, A709 Gr. 50: the composition windows overlap closely enough that one certificate satisfies the other. A588 / A709-50W, S355JR / S355J2, S355M / S355N and 4 more differ by one requirement, which is a line on the order rather than a redesign. A36, S355MC serve in the same applications, but the composition differs enough that the engineer signs it off, not the buyer. The table holds 4 in ASTM / ASME, 3 in EN (European), 1 in GB/T (China), 1 in GOST (Russia/CIS), 1 in IS (India), 1 in JIS (Japan).
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| A992 | ASTM / ASME | Identical | Same 345 MPa yield for W-shapes with added yield cap and Fy/Fu limit; shapes are dual-certified. |
| A709 Gr. 50 | ASTM / ASME | Identical | A572-50 chemistry and strength plus Charpy zone requirements for bridges. |
| A588 / A709-50W | ASTM / ASME | Near | Weathering HSLA with 345 MPa yield and Cu-Cr-Ni for unpainted service. |
| S355JR / S355J2 | EN (European) | Near | Yield 355 MPa (≤ 16 mm), Rm 470–630 MPa, guaranteed Charpy (+20 / −20 °C); non-alloy rather than HSLA chemistry. S355J2 is the standard European substitute for A572-50 plate. |
| S355M / S355N | EN (European) | Near | EN 10025-4 / -3 thermomechanical or normalized fine-grain HSLA — the closest metallurgical match (Nb/V micro-alloyed, 355 MPa). |
| Q355B / Q345B | GB/T (China) | Near | GB/T 1591 Q355B: yield 355 MPa, Rm 470–630 MPa, 34 J at +20 °C (formerly Q345B: 345 MPa). |
| 09G2S / S345 | GOST (Russia/CIS) | Near | GOST 19281 09G2S (C345): yield 325–345 MPa; GOST 27772 S345 structural class. |
| IS 2062 E350 | IS (India) | Near | Yield 350 MPa, Rm 490 MPa min (quality A/BR/B0/C by impact). |
| SM490A / SM490YB | JIS (Japan) | Near | JIS G3106 SM490A: yield 325 MPa (≤ 16 mm), Rm 490–610 MPa; SM490YB: yield 365 MPa, 27 J at 0 °C. |
| A36 | ASTM / ASME | Functional | 250 MPa carbon steel — the grade A572-50 replaces when weight matters. |
| S355MC | EN (European) | Functional | Same yield class (345 MPa) as plate/sections, but not thermomechanically rolled and without the guaranteed bend radii. |
Identical, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
A572 Grade 50 in ASTM / ASME
- A992 — Identical Same 345 MPa yield for W-shapes with added yield cap and Fy/Fu limit; shapes are dual-certified.
- A709 Gr. 50 — Identical A572-50 chemistry and strength plus Charpy zone requirements for bridges.
- A588 / A709-50W — Near Weathering HSLA with 345 MPa yield and Cu-Cr-Ni for unpainted service.
- A36 — Functional 250 MPa carbon steel — the grade A572-50 replaces when weight matters.
A572 Grade 50 in EN (European)
- S355JR / S355J2 — Near Yield 355 MPa (≤ 16 mm), Rm 470–630 MPa, guaranteed Charpy (+20 / −20 °C); non-alloy rather than HSLA chemistry. S355J2 is the standard European substitute for A572-50 plate.
- S355M / S355N — Near EN 10025-4 / -3 thermomechanical or normalized fine-grain HSLA — the closest metallurgical match (Nb/V micro-alloyed, 355 MPa).
- S355MC — Functional Same yield class (345 MPa) as plate/sections, but not thermomechanically rolled and without the guaranteed bend radii.
A572 Grade 50 in GB/T (China)
- Q355B / Q345B — Near GB/T 1591 Q355B: yield 355 MPa, Rm 470–630 MPa, 34 J at +20 °C (formerly Q345B: 345 MPa).
A572 Grade 50 in GOST (Russia/CIS)
- 09G2S / S345 — Near GOST 19281 09G2S (C345): yield 325–345 MPa; GOST 27772 S345 structural class.
A572 Grade 50 in IS (India)
- IS 2062 E350 — Near Yield 350 MPa, Rm 490 MPa min (quality A/BR/B0/C by impact).
A572 Grade 50 in JIS (Japan)
- SM490A / SM490YB — Near JIS G3106 SM490A: yield 325 MPa (≤ 16 mm), Rm 490–610 MPa; SM490YB: yield 365 MPa, 27 J at 0 °C.
Superseded names for A572 Grade 50
- K02303 (Gr 50), K02703 (Gr 42), K02003 (Gr 60/65) — UNS
- A441 — ASTM A441 (withdrawn 1989): Predecessor Mn-V HSLA (50 ksi) replaced by A572.
- A709 Grade 50 — ASTM A709 / AASHTO M270: Bridge version with Charpy zones; 50W is the weathering variant (A588 chemistry).
- A992 — ASTM A992: W-shape grade (50–65 ksi yield, Fy/Fu ≤ 0.85); most W-shapes are dual-certified A992/A572-50.
- CSA G40.21 350W — Canada: Canadian 350 MPa structural equivalent.
Key data for A572 Grade 50
Verified against ASTM A572/A572M-21. Last checked: September 2026.