Standard Scope
The standard applies to forged low alloy steel and stainless steel pipe parts for use in pressure systems. These include flanges, fittings, valves and similar parts that meet specified size or size standards. And it includes several grades of low carbon alloy steel and ferritic, martensitic, austenitic and ferritic-austenitic stainless steels. So it should be selected according to the design and use requirements.
When additional tests or inspections are required, supplementary requirements are provided for use. When the purchaser has specified them individually in the order, and it can be used.
Common Grades
Alloy grade: ASTM A182 F5, F9, F91, F92, F11, F12, F21, F22
Stainless steel grade: ASTM A182 F304, F304L, F316, F316L
Alloy Flange: ASTM A182 F11, F22
ASTM F11, F22 is the most use alloy steel grade in ASTM A182.
Stainless Steel Flange: ASTM A182 F316
ASTM A182 F316 is most used for stainless steel flange, includes weld neck flange, slip on flange, blind flange, socket weld flange and etc.
Either alloy steel or stainless steel flange dimensions available for the OD up to 48 inch, class pressure from 150# to 2500#.
Units
This specification is expressed in inch-pounds and SI units.
Manufacture Types
For Low Alloy Ferritic Steels
Low alloy ferritic steels should be smelted in one of the following methods:
a. Open hearth furnaces
b. Electric furnaces
c. Basis -oxygen process (with the option of separate degassing and refining processes).
For Stainless Steel
Stainless steel should be smelted in one of the following ways:
a. Electric furnace (with separate deoxidation and refining (optional))
b. Vacuum furnace
c. One of the above, followed by vacuum or electroslag self-consumption remelting.
The discard should be removed sufficiently, so as to ensure the elimination of harmful shrinkage and excessive segregation.
