Can STPG410 replace A106 Gr.B on a Japanese project?

It is the home-market counterpart and normally the specified JIS option; composition and tensile class overlap A106 Gr.B closely. For ASME-code work the drawing standard still governs acceptance.

Grades · Pipe & Tube Steel · STPG410

STPG410

Data verified

STPG410 is the higher-strength JIS G3454 pressure pipe grade, the counterpart class to ASTM A106 Grade B — the most widely specified carbon pressure-pipe level in Japanese plant engineering, with tensile strength of at least 410 MPa.

DINP265GH type (near)

AISIA106 Gr.B (near)

JISSTPG410 (JIS G3454)

CategoryPipe & Tube Steel

Chemical composition

Element	Content (%)
C	≤0.30
Si	≤0.35
Mn	0.30–1.00
P	≤0.040
S	≤0.040

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Tensile strength	≥410 MPa
Yield strength	≥245 MPa
Density	7.85 g/cm³
Product form	Carbon steel pipe for pressure service (JIS G3454)

Heat treatment

As manufactured (seamless or ERW); post-weld normalizing only where the piping code calls for it.

Equivalent grades

Standard	Designation
din	P265GH type (near)
aisi	A106 Gr.B (near)
jis	STPG410 (JIS G3454)
gb	20G type (near)

Compare side by side: STPG410 vs STPG370

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Process and power plant piping, steam lines, refinery and chemical plant pressure piping.

Processing: Standard carbon-steel welding; with C up to 0.30% and Mn up to 1.00%, check CEV on heavy-wall pipe and apply preheat accordingly.

FAQ

Can STPG410 replace A106 Gr.B on a Japanese project?: It is the home-market counterpart and normally the specified JIS option; composition and tensile class overlap A106 Gr.B closely. For ASME-code work the drawing standard still governs acceptance.

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Source: JIS G3454 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.