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A387 Grade 21 steel Plate

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Product: Hot rolled chromium-molybdenum alloy steel plates intended particularly for welded boilers and pressure vessels designed for elevated temperature service.
A387 Grade 21 steel product available : A387 Grade 21 Steel plates, A387 Grade 21 steel sheets,
A387 Grade 21 steel standard :ASTM A387/A387M
ASTM A387/A387M A387 Grade 21 specification includes two classes : A387 Grade 21 Class 1, A387 Grade 21 Class 2,
A387 Grade 21 delivery condition: Thermally treated, A(Annealed),N&T (Normalized + Tempered), Q&T(Quenched+Tempered)

A387 Grade 21 pressure vessel steel chemical composition %

Grade UNS No. C Mn P max S max Si Cr Mo
A387 Grade 21 K31545 0.05-0.15 0.30-0.60 0.025 0.025 0.50 max 2.75-3.25 0.90-1.10

A387 Grade 21 pressure vessel steel Mechanical properties
Grade UNS No. Yield strength ReH MPa min Tensile strength Rm MPa Elongation A% min
200mm 50mm
A387 Grade 21 class 1 K31545 205 415-585 - 18
A387 Grade 21 class 2 310 515-690 - 18


JOIN-WIN STEEL keeps enough quantity A387 Grade 21 steel in stock each month. We can meet our customer’s further process request like : cutting ( any size and any shape ) drilling, welding, milling, machining and steel structure.

Others steel grades steel plate for pressure vessel and boiler equipment in the standard ASTM A387/A387M and ASME SA387/SA387M:
A387 Grade 2 alloy steel plate for pressure vessels,
A387 Grade 12 alloy steel plate for pressure vessels,
A387 Grade 11 alloy steel plate for pressure vessels,
A387 Grade 22 alloy steel plate for pressure vessels,
A387 Grade 22L alloy steel plate for pressure vessels,
A387 Grade 21L alloy steel plate for pressure vessels,
A387 Grade 5 alloy steel plate for pressure vessels,
A387 Grade 9 alloy steel plate for pressure vessels,
A387 Grade 91 alloy steel plate for pressure vessels,
SA387 Grade 2 alloy steel plate for pressure vessels,
SA387 Grade 12 alloy steel plate for pressure vessels,
SA387 Grade 11 alloy steel plate for pressure vessels,
SA387 Grade 22 alloy steel plate for pressure vessels,
SA387 Grade 22L alloy steel plate for pressure vessels,
SA387 Grade 21 alloy steel plate for pressure vessels,
SA387 Grade 21L alloy steel plate for pressure vessels,
SA387 Grade 5 alloy steel plate for pressure vessels,
SA387 Grade 9 alloy steel plate for pressure vessels,
SA387 Grade 91 alloy steel plate for pressure vessels,

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