A387 Grade 11 Class 2 Steel Plate

Large heads made of ASTM ASME A387 Grade 11 being heat treated

A387 Grade 11 is a chrome moly steel according to the ASTM/ASME A387 standard and is designed for use in welded boilers and pressure vessels used a elevated temperatures

ASTM/ASME A387 11 Class 2 is available from stock in a range of thicknesses from 6 mm to 60 mm. These plates all from German or northern European mills and normally have an MTC to EN10204 3.1

A387 Gr 11 contains Chromium and Molybdenum as alloying elements to provide the heat and corrosion resistance than enables it to be used at high temperatures.

We only offer A387 Grade 11 to Class 2 as these have improved physical properties over class 1 plates

A387 Grade 11 Plates Ex-Stock

Thickness: 8 – 60 mm
Width Up to 3 metres wide
Length: up to 12 metres Long
Certification: EN 10204 3.1

European customers can purchase ASTM A387 Gr 11 from AncoferWaldram or order new rolling directly from Dillinger Hutte. You can purchase a copy of ASTM A387A387M-11 from the BSI website

ASTM A387 Grade 11 Pressure Vessel Steel Chemical Composition

Steel Grade	C	C (Min)	Si	Si (Min)	Mn	Mn (Min)	P	S	Cr	Cr (Min)	Mo	Mo (Min)
A387 11 CL2	0.17	0.04	0.86	0.44	0.73	0.35	0.035	0.035	1.56	0.94	0.7	0.4

This table provides the main features of the chemical composition of A387 Grade 11 boiler plate steel as required by ASTM/ASME A387. It is not complete as we have not included many of the minor use cases. These may have a major impact in your application so please use this for reference purposes only and refer to your original and up to date copy of the relevant standard