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

P265TR1 (1.0258)

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water, hydrocarbons, compressed air) at moderate pressure and temperature, generally up to 350-400°C. The industry's historical reference: ASTM A106 Grade B and API 5L Grade B in the United States, with close equivalents in Europe (EN 10216-1), Japan (JIS G3454) and South Korea (KS D3562,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
P265TR1 (1.0258)	EU	EN 10216-1:2013	265	410–570	reference
API 5L Grade B / L245	US	API Spec 5L (46e éd.), PSL1	245	≥415	-8%
A106 Grade B	US	ASTM A106/A106M-19 (ASME SA-106)	240	≥415	-9%
Neighboring grades — different strength
P235TR1 (1.0254)	EU	EN 10216-1:2013	235	360–500	-11%
SPPS380 (anciennement SPPS38)	KR	KS D3562	220	≥380	-17%
STPG370 (anciennement STPG38)	JP	JIS G3454:2018	215	≥370	-19%

Chemical composition (wt%)

Grade	C	Mn	Si	P	S	Cr	Ni	Mo	Cu	V
P265TR1 (1.0258)	≤0.2	≤1.4	≤0.4	≤0.025	≤0.02	≤0.3	≤0.3	≤0.08	≤0.3	≤0.02
API 5L Grade B / L245	≤0.28	≤1.2	—	≤0.03	≤0.03	≤0.5	≤0.5	≤0.15	≤0.5	—
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
P235TR1 (1.0254)	≤0.16	≤1.2	≤0.35	≤0.025	≤0.02	≤0.3	≤0.3	≤0.08	≤0.3	≤0.02
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	—	—	—	—	—

Note: A higher-strength variant of the same EN10216-1 family as P235TR1 (slightly higher carbon and manganese). Its mechanical properties (265 MPa/410-570 MPa) are closer to A106 Gr B and API 5L Gr B (240-245 MPa/415 MPa) than P235TR1's are.

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