A387 Gr.22 vs 10CrMo9-10?

Same 2.25Cr-1Mo alloy family: Gr.22 is the ASTM A387 plate spec, 10CrMo9-10 the EN 10028 grade. Chemistry and Class 2 properties overlap closely, but coded work follows the project specification.

Grades · Structural & HSLA Steel · A387 Gr.22

A387 Gr.22

Data verified

ASTM A387 Grade 22 is the 2.25Cr-1Mo plate behind hydrocracking and hydrotreating reactors — the workhorse alloy for hot, high-pressure hydrogen service. Its creep strength and hydrogen resistance hold to roughly 600 °C.

DIN10CrMo9-10 (near)

AISIA387 Gr.22 Cl.2

JISSCMV4 (near)

CategoryStructural & HSLA Steel

Chemical composition

Element	Content (%)
C	0.05–0.15
Si	≤0.50
Mn	0.30–0.60
P	≤0.025
S	≤0.025
Cr	2.00–2.50
Mo	0.90–1.10

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

Properties

Yield strength	≥310 MPa (Class 2)
Tensile strength	515–690 MPa (Class 2)
Density	7.85 g/cm³

Heat treatment

Supplied normalized and tempered; temper and PWHT typically 675–720 °C. Step-cooling / temper-embrittlement controls (J-factor) are specified for heavy-wall reactor plate.

Equivalent grades

Standard	Designation
din	10CrMo9-10 (near)
aisi	A387 Gr.22 Cl.2
jis	SCMV4 (near)
gb	12Cr2Mo1R (near)

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

Applications & Processing

Applications: Hydrocrackers, hydrotreaters, ammonia converters, high-temperature separators.

Processing: Strict welding discipline: low-hydrogen Cr-Mo consumables, preheat/interpass control, de-hydrogenation heat treatment and full PWHT are mandatory.

FAQ

A387 Gr.22 vs 10CrMo9-10?: Same 2.25Cr-1Mo alloy family: Gr.22 is the ASTM A387 plate spec, 10CrMo9-10 the EN 10028 grade. Chemistry and Class 2 properties overlap closely, but coded work follows the project specification.

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Source: ASTM A387 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.