A106 Grade B equivalent grades: ASTM, EN, JIS, GB, DIN

Cross-reference for A106 Grade B across standard systems. Each match is graded so you can see how safe the substitution is. Seamless carbon steel pipe for high-temperature service — full A106 Grade B 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.

A106 Grade B in ASTM / ASME

• A53 Gr. B (Type S) — Near Same 240/415 MPa; A53 may be semi-killed and is intended for general (not high-temperature) service; most seamless pipe is dual-certified A106-B/A53-B.
• API 5L Gr. B — Near Line pipe: yield 241 MPa (35 ksi), tensile 414 MPa (60 ksi); PSL1/PSL2 with different testing; often triple-certified.
• A333 Gr. 6 — Near Same strength as A106-B with guaranteed 18 J (avg 13.5 J) Charpy at −45 °C for low-temperature service; normalized.
• A335 P11 / P22 — Functional Cr-Mo seamless pipe for service above ~425 °C where carbon steel graphitizes.

A106 Grade B in EN (European)

• P235GH / P265GH — Near EN 10216-2 seamless pressure tube: P235GH (yield 235, Rm 360–500) is the usual substitute; P265GH (265 / 410–570) matches A106-B tensile. Both guarantee yield to 400–450 °C.
• P235TR2 / P265TR2 — Near EN 10216-1 non-alloy tubes for pressure (room temperature) — the A53-type equivalents.

A106 Grade B in GB/T (China)

• 20 / 20G — Near GB/T 8163 grade 20 (fluid) and GB/T 5310 20G (boiler): C 0.17–0.24, yield ≥ 245, Rm ≥ 410 MPa.

A106 Grade B in GOST (Russia/CIS)

• 20 / 10 — Near GOST 8731/8732 Steel 20 seamless tube: yield ≥ 245, Rm ≥ 412 MPa.

A106 Grade B in JIS (Japan)

• STPG370 / STPG410 — Near JIS G3454 STPG370 (Rm ≥ 370, yield ≥ 215) and STPG410 (Rm ≥ 410, yield ≥ 245) — pressure piping to 350 °C; STPT410 (G3456) for high temperature ≈ A106-B.

A106 Grade B in IS (India)

• IS 1239 / IS 3589 — Functional Indian ERW pipe specs; IS 1239 Heavy (yield 195–320) is the water/gas pipe; for seamless pressure pipe India uses A106/SA-106 directly.

Superseded names for A106 Grade B

• K03006 (Gr B), K02501 (Gr A), K03501 (Gr C) — UNS
• SA-106 — ASME BPVC Section II Part A: ASME adoption; pipe is dual-marked A106/SA-106 and usually also A53 B and API 5L B (triple stencil).
• A53 Grade B — ASTM A53 (Type S): General-service seamless/welded pipe with the same strength; A106 adds killed steel, Si min and high-temperature intent.
• API 5L Grade B — API 5L: Line pipe with the same 241/414 MPa; triple-certified pipe is common.
• St 35.8 / St 45.8 — DIN 17175 (withdrawn): German boiler tube grades now P235GH/P265GH (EN 10216-2).

Key data for A106 Grade B

Full composition, mechanical properties by thickness, heat treatment and applications for A106 Grade B →

Verified against ASTM A106/A106M-19a. Last checked: September 2026.