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

A106 Grade B

USApproximate match

ASTM · ASTM A106/A106M-19 (ASME SA-106)

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water, hydrocarbons, compressed air) at moderate pressure and temperature, generally up to 350-400°C. The industry's historical reference: ASTM A106 Grade B and API 5L Grade B in the United States, with close equivalents in Europe (EN 10216-1), Japan (JIS G3454) and South Korea (KS D3562,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
A106 Grade B	US	ASTM A106/A106M-19 (ASME SA-106)	240	≥415	reference
P235TR1 (1.0254)	EU	EN 10216-1:2013	235	360–500	-2%
API 5L Grade B / L245	US	API Spec 5L (46e éd.), PSL1	245	≥415	+2%
SPPS380 (anciennement SPPS38)	KR	KS D3562	220	≥380	-8%
P265TR1 (1.0258)	EU	EN 10216-1:2013	265	410–570	+10%
STPG370 (anciennement STPG38)	JP	JIS G3454:2018	215	≥370	-10%

Chemical composition (wt%)

Grade	C	Mn	Si	P	S	Cr	Ni	Mo	Cu	V
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
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	—	—	—	—	—
P265TR1 (1.0258)	≤0.2	≤1.4	≤0.4	≤0.025	≤0.02	≤0.3	≤0.3	≤0.08	≤0.3	≤0.02
STPG370 (anciennement STPG38)	≤0.25	0.3–0.9	≤0.35	≤0.04	≤0.04	—	—	—	—	—

Note: The historical reference grade for the North American market for high-temperature seamless pipe (up to ~450°C). The residual elements Cr, Cu, Mo, Ni, V combined must not exceed 1.00% total. Serves as the comparison baseline for the whole family.

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