SA387 Gr.22 Cl.1 High-Temperature Pressure Vessel Steel Plate

SA387 Gr. 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate designed for high-temperature and high-pressure service in pressure vessels, boilers, and reactors. It offers superior creep resistance and strength compared to lower-grade Cr-Mo steels like Gr. 11.

Chat Now

Send Inquiry

Product Description

1.What are the chemical compositions of SA387 Gr. 22 Class 1?

Chemical Composition (Weight %)

Element	Requirement (ASTM A387)	Typical Range
Carbon (C)	0.05–0.15%	0.08–0.12%
Manganese (Mn)	0.30–0.60%	0.40–0.55%
Phosphorus (P)	≤ 0.025%	≤ 0.020%
Sulfur (S)	≤ 0.025%	≤ 0.015%
Silicon (Si)	0.50% max	0.20–0.40%
Chromium (Cr)	2.00–2.50%	2.10–2.30%
Molybdenum (Mo)	0.90–1.10%	0.95–1.05%

2.What is the ASTM SA387 Grade 22 Class 1 equivalent to?

SA387 Gr. 22 Class 1 (2.25Cr-1Mo steel) has direct or near-equivalent grades in international standards, including EN, JIS, ISO, and ASME. Below is a detailed comparison:

International Equivalent Grades

Standard	Equivalent Grade	Key Similarities	Minor Differences
EN (Europe)	13CrMo4-5 (EN 10028-2)	Same Cr-Mo content (~2.25Cr-1Mo), similar mechanical properties	Slightly different heat treatment requirements
JIS (Japan)	SCMV 4 (JIS G4109)	Nearly identical composition & strength	Impact test requirements may vary
ISO	13CrMo4-5 (ISO 9328-2)	Matches EN standard	Same as EN equivalent
ASME	SA542 Type D (for forgings)	Similar Cr-Mo content, used in high-temp applications	Different product form (plate vs. forging)
GB (China)	12Cr2Mo1R (GB/T 713)	Close composition (slightly different Cr/Mo limits)	Chinese standard, used in domestic projects