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ASTM/ASME A387 Hastelloy Plates

ASTM A387, ASME SA 387, is one of our most popular products. It is a low alloy pressure vessel quality steel for high temperatures. We have a wide range of plate sizes available and thicknesses range from 6mm to 100mm. The ASME SA387 standards covers the supply of weldable chrome molybdenum alloy steel plates for pressure vessels used in elevated temperature service.

The added molybdenum and chromium provides excellent corrosion resistance and high temperature resistance respectively. ASME SA387 standard plates are used by the world’s leading fabricators who in turn, supply primarily to the oil and petrochemical industry. Applications for ASME SA387 include pressurized vessels, industrial boilers, heat exchangers and pipe work.

This specification covers chromium-molybdenum alloy steel plates for welded boilers and pressure vessels designed for elevated temperature service. Materials considered under this specification are available in grades 2, 12, 11, 22, 22L, 5, 9 and 91. The steel materials shall be killed and shall be thermally treated. The steel specimens shall undergo heat analysis and product analysis and shall conform to the chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, nickel, vanadium, columbium, boron, nitrogen, aluminum, titanium, and zirconium. The steel specimens shall also undergo tension tests and shall conform to the required values of tensile strength, yield strength, and elongation.

This specification covers molybdenum alloy steel plates, intended particularly for welded boilers and other pressure vessels. Plates under this specification are available in three grades having different strength levels: Grade A; Grade B; and Grade C. The steel shall be killed. The steel shall conform to the chemical requirements specified.

ASME SA387 Grade 5 Alloy Steel Plates :

A high quality chrome molybdenum alloy steel plate intended specifically for use in weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperature tensile strength and the chromium provides improved corrosion resistance.







Specifications ASME SA387 Grade 5 Alloy Steel Plates :


Nominal Chromium
Content (%)

Nominal Molybdenum
Content (%)

SA387 Grade 5



Tensile Requirements for ASME SA387 Grade 5 Alloy Steel Plates Class 2 Plates :



Grade 5

SA387 Grade 5

Tensile strength, ksi [MPA]

75 to 100 [515 to 690]

Yield strength, min, ksi [MPa]/(0.2% offset)

45 [310]

Elongation in 8 in. [200mm], min %

Elongation in 2 in. [50mm], min, %


Reduction of area, min %

45 (measured on round specimen)
40 (measured on flat specimen)

Chemical Requirements for ASME SA387 Grade 5 Alloy Steel Plates :


Chemical Composition (%)

SA 387 Grade 5


Heat Analysis:

0.15 max

Product Analysis:

0.15 max


Heat Analysis:

0.30 – 0.60

Product Analysis:

0.25 – 0.66


Heat Analysis:


Product Analysis:


Sulphur (max):

Heat Analysis:


Product Analysis:



Heat Analysis:

0.50 max

Product Analysis:

0.55 max


Heat Analysis:

4.00 – 6.00

Product Analysis:

3.90 – 6.10


Heat Analysis:

0.45 – 0.65

Product Analysis:

0.40 – 0.70

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