ASTM A387 Grade 12 Class 1 and Class 2 alloy steel for pressure vessel plates

ASTM A387 Grade 12 Class 1 and Class 2 alloy steel for pressure vessel plates

 

ASTM A387 Grade 12 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 12 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 12 in order to produce high-quality products. The chemical composition of Grade 12 includes carbon, manganese, phosphorus, sulfur, silicon, chromium, and molybdenum. The material is also available in Class 2, which includes the addition of vanadium.

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. The two grades We produces are available as Class 1 and/or Class 2.

Dimension Range

GRADE	PRODUCT TYPE	THICKNESS (in)	WIDTH (in)	LENGTH (in)
Grade 12	Plate	0.276 - 2.00	75 - 129.9	154 - 590

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

 

Mechanical Properties

PRODUCT TYPE	GRADE	THICKNESS (in)	0.2% YS (ksi)	UTS (ksi)	ELONGATION IN 2" 1) (MIN %)	ELONGATION IN 8" 1) (MIN %)
Plate	Grade 12 Class 1	0.276 - 2.00	33	55 - 80	22	18
Plate	Grade 12 Class 2	0.276 - 2.00	40	65 - 85	22	19

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