ASTM A387 is the technical delivery standard covering the supply of chrome molybdenum pressure vessel alloy steel plates. The introduction of chrome molybdenum increases the materials temperature tensile strength making it an excellent choice for elevated temperature environments. The material also displays excellent corrosion resistant characteristics. ASTM A387 is therefore ideal for the fabrication of weldable steel pressure vessels and industrial boilers found commonly in the petrochemical and oil industry.

ASTM A387 Grade 9 Alloy Steel Plates Specifications

Designation	Nominal Chromium Content (%)	Nominal Molybdenum Content (%)
A387 Grade 9	9.00%	1.00%

Carbon (C)	%
Heat Analysis: Product Analysis:	0.08 – 0.12 0.06 – 0.15
Manganese (Mn)	%
Heat Analysis: Product Analysis:	0.30 – 0.60 0.25 – 0.66
Phosphorus (P)	%
Heat Analysis: Product Analysis:	0.020 0.025
Sulphur (S) (Max)	%
Heat Analysis: Product Analysis:	0.010 0.012
Silicon (Si)	%
Heat Analysis: Product Analysis:	0.20 – 0.50 0.18 – 0.56
Chromium (Cr)	%
Heat Analysis: Product Analysis:	8.00 – 9.50 7.90 – 9.60
Molybdenum (Mo)	%
Heat Analysis: Product Analysis:	0.85 – 1.05 0.80 – 1.10
Nickel (Ni)	%
Heat Analysis: Product Analysis:	0.40 0.43
Vanadium (Vn)	%
Heat Analysis: Product Analysis:	0.18 – 0.25 0.16 – 0.27
Columbium (Nb)	%
Heat Analysis: Product Analysis:	0.06 – 0.10 0.05 – 0.11
Nitrogen (N)	%
Heat Analysis: Product Analysis:	0.030 – 0.070 0.025 – 0.080
Aluminium (Al)	%
Heat Analysis: Product Analysis:	0.02 0.02
Titanium (Ti)	%
Heat Analysis: Product Analysis:	0.01 0.01
Zirconium (Zr)	%
Heat Analysis: Product Analysis:	0.01 0.01

The carbon content for plates over 5 in. (125 mm) in thickness is 0.17 max on product analysis.

Grade	Thickness	Yield	Tensile	Elongation
A387 Gr.9 Cl.1	mm	Min Mpa	Mpa	Min  %
	t≦50	205	415-585	18
	50<t≦200	–	–	–

ASTM A387 / ASTM A387 GRADE 11 Class 1 alloy steel plates. With a steadfast commitment to excellence, Amardeep Steel delivers top-quality products that align with industry standards, catering to diverse industrial applications. ASTM A387 GRADE 11 Class 1 Steel Plate stands as a notable example of weldable carbon steel plates purposefully designed for deployment within pressure vessels and boilers subjected to elevated temperatures. This material derives enhanced properties from the strategic incorporation of chromium and molybdenum, two elements that confer upon the steel heightened resistance against corrosion and the capability to endure elevated heat conditions. SA387 Grade 9 emerges as the preferred choice for fabricators catering to the oil, gas, and petrochemical sectors.

ASTM A387 Grade 9 Alloy Steel Plates Specifications

Designation	Nominal Chromium Content (%)	Nominal Molybdenum Content (%)
A387 Grade 9	9.00%	1.00%

Grade	The Element Max (%)
	C	Si	Mn	P	S	Cr	Mo
A387 Gr.9 Cl.1	0.15	1.05	0.25-0.66	0.03	0.03	7.90-10.10	0.85-1.10

The carbon content for plates over 5 in. (125 mm) in thickness is 0.17 max on product analysis.

Grade	Thickness	Yield	Tensile	Elongation
A387 Gr.9 Cl.1	mm	Min Mpa	Mpa	Min  %
	t≦50	205	415-585	18
	50<t≦200	–	–	–