A572 Grade 50 equivalent grades: ASTM, EN, JIS, GB, DIN

Cross-reference for A572 Grade 50 across standard systems. Each match is graded so you can see how safe the substitution is. High-strength low-alloy (HSLA) columbium-vanadium structural steel — full A572 Grade 50 data sheet.

Cross-reference table

Identical = same composition and mechanical limits within rounding. Near = one limit differs (e.g. carbon max or impact temperature). Functional = interchangeable for most uses after an engineering check.

How the matches are graded

Identical means the chemical composition windows overlap so that material certified to one specification meets the other without deviation, and the mechanical minimums are the same or the other is inside them — mills usually dual-certify. Near means one limit differs (a carbon maximum, an impact temperature, a strength minimum or a delivery condition) and a substitution needs a one-line engineering check. Functional means the grades serve the same purpose but are not the same steel — a designer can often use one for the other, but only after re-checking the design.

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

Full composition, mechanical properties by thickness, heat treatment and applications for A572 Grade 50 →

Verified against ASTM A572/A572M-21. Last checked: September 2026.