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.
Last updated
A572 Grade 50 and A992, A709 Gr. 50 are the same steel under different national numbers; a single mill certificate covers both. A588 / A709-50W, S355JR / S355J2, S355M / S355N and 4 more sit one step away, differ in a strength minimum or in the quality class rather than in the metallurgy. 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.