ASTM A387 Grade 11 Class 1 and Class 2 alloy steel for pressure vessel plates

ASTM A387 Grade 11 Class 1 and Class 2 alloy steel for pressure vessel plates

 

ASTM A387 Grade 11 is a specification for pressure vessel plates, alloy steel, chromium-molybdenum. This grade of steel is designed for use in welded boilers and pressure vessels, which are designed for elevated temperature service. The material has excellent corrosion and oxidation resistance, making it ideal for use in the oil, gas, and petrochemical industries, as well as in power generation and other high-temperature applications.

 

Grade 11 is one of the most commonly used grades of the ASTM A387 specification. It is available in two classes, Class 1 and Class 2. Class 1 plates are available in the normalized and tempered condition, while Class 2 plates are available in the quenched and tempered condition. The difference between the two classes lies in the addition of vanadium in Class 2 plates, which improves the toughness and high-temperature strength of the material.

 

As a manufacturer, it is important to understand the chemical composition and mechanical properties of ASTM A387 Grade 11 in order to produce high-quality products. The chemical composition of Grade 11 includes carbon, manganese, phosphorus, sulfur, silicon, chromium, and molybdenum. The material is also available in Class 2, which includes the addition of vanadium.

 

In terms of mechanical properties, ASTM A387 Grade 11 has a minimum tensile strength of 60 ksi and a minimum yield strength of 35 ksi for Class 1 plates. Class 2 plates have a higher minimum tensile strength of 75 ksi and a minimum yield strength of 43 ksi. The material also has good elongation and reduction of area values, which ensure it can withstand the stresses and strains of high-temperature service.

 

Overall, ASTM A387 Grade 11 is an excellent material for use in high-temperature and high-pressure applications. As a manufacturer, it is important to adhere to the ASTM A387 specification to ensure the production of high-quality and reliable products.

 

General Product Description

The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum intended primarily for use in welded boilers and pressure vessels designed for elevated temperature service. We can supply A387 Grade 11 to the tension test requirements for Class 1 and/or Class 2.

Dimension Range

GRADE	PRODUCT TYPE	THICKNESS (in)	WIDTH (in)	LENGTH (in)
Grade 11	Plate	0.185 - 3.60	60 - 131.9	73 - 590

Width: Inquire for widths and lengths outside the noted ranges.

 

Mechanical Properties

Tensile testing is performed in the transverse direction.

GRADE	THICKNESS (in)	YIELD STRENGTH (MIN ksi)	TENSILE STRENGTH (ksi)	ELONGATION IN 2" 1) (MIN %)	ELONGATION IN 8" 1) (MIN %)
Grade 11 Class 1	0.185 - 3.60	35	60 - 85	22	19
Grade 11 Class 2	0.185 - 3.60	45	75 - 100	22	18

1) Refer to ASTM A20/A20M for Elongation adjustments based on plate thickness.