Steel equivalents / Seamless / welded carbon steel pipe (A106 Gr B / API 5L Gr B / P235TR1-P265TR1 / STPG370 / SPPS380)

P235TR1 (1.0254)

EUApproximate match

CEN · EN 10216-1:2013

Family of seamless or welded carbon steel pipes used to convey fluids (steam, water, hydrocarbons, compressed air) at moderate pressure and temperature, generally up to 350-400°C. The industry's historical reference: ASTM A106 Grade B and API 5L Grade B in the United States, with close equivalents in Europe (EN 10216-1), Japan (JIS G3454) and South Korea (KS D3562, harmonized with the Japanese standard).

Equivalents by yield strength proximity

Grade	Region	Standard	Re (MPa)	Rm (MPa)	Delta
P235TR1 (1.0254)	EU	EN 10216-1:2013	235	360–500	reference
A106 Grade B	US	ASTM A106/A106M-19 (ASME SA-106)	240	≥415	+2%
API 5L Grade B / L245	US	API Spec 5L (46e éd.), PSL1	245	≥415	+4%
SPPS380 (anciennement SPPS38)	KR	KS D3562	220	≥380	-6%
STPG370 (anciennement STPG38)	JP	JIS G3454:2018	215	≥370	-9%
Neighboring grades — different strength
P265TR1 (1.0258)	EU	EN 10216-1:2013	265	410–570	+13%

Chemical composition (wt%)

Grade	C	Mn	Si	P	S	Cr	Ni	Mo	Cu	V
P235TR1 (1.0254)	≤0.16	≤1.2	≤0.35	≤0.025	≤0.02	≤0.3	≤0.3	≤0.08	≤0.3	≤0.02
A106 Grade B	≤0.3	0.29–1.06	≥0.1	≤0.035	≤0.035	≤0.4	≤0.4	≤0.15	≤0.4	≤0.08
API 5L Grade B / L245	≤0.28	≤1.2	—	≤0.03	≤0.03	≤0.5	≤0.5	≤0.15	≤0.5	—
SPPS380 (anciennement SPPS38)	≤0.25	0.3–0.9	≤0.35	≤0.04	≤0.04	—	—	—	—	—
STPG370 (anciennement STPG38)	≤0.25	0.3–0.9	≤0.35	≤0.04	≤0.04	—	—	—	—	—
P265TR1 (1.0258)	≤0.2	≤1.4	≤0.4	≤0.025	≤0.02	≤0.3	≤0.3	≤0.08	≤0.3	≤0.02

Note: Low-strength grade of the EN10216-1 series (no mandatory low-temperature impact test, unlike the TR2 suffix). Yield strength of 235 MPa applies to thickness ≤16mm, decreasing to 225 MPa (16-40mm) then 215 MPa (40-60mm). Sum of Cr+Cu+Mo+Ni limited to 0.70% total.

Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.