Flange materials acc. to ASTM

Dimensions from carbon steel and stainless steel flanges are defined in the ASME B16.5 standard. The material qualities for these flanges are defined in the ASTM standards.

These ASTM standards, define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by “Grade”.
For example, a carbon steel flange can be identified with Grade F9 or F11, a stainless-steel flange with Grade F316 or Grade F321 etc..
Below you will find as an example a table with chemical requirements for fittings ASTM A403 Grade WP304, WP304L, WP316L and a table with frequent Grades, arranged on pipe and pipe-components, which belong together as a group.
As you may be have noted, in the table below, ASTM A105 has no Grade. Sometimes ASTM A105N is described;
“N” stands not for Grade, but for normalized. Normalizing is a type of heat treatment, applicable to ferrous metals only. The purpose of normalizing is to remove the internal stresses induced by heat treating, casting, forming etc..

Chemical requirements composition, %

Chemical elementsGrade F304 (A)Grade F304L (A)Grade F316L (A-B)
Carbon, max0.080.0350.035
Manganese, max2.002.002.00
Phosphorus, max0.0450.0450.045
Sulfur, max0.030.030.03
Silicon, max1.001.001.00
Nickel8-118-1310-15
Chrome18 – 2018 – 2016 – 18
Molybdenum--2.00-3.00
(A) Carbon 0.040% max. is necessary where many drawing passes are required, as with outside
diameter <0.5 inch (12.7 mm), or nominal wall thickness <0.049 inch (1.2 mm).
(B) On pierced tube, Nickel may be 11 – 16.00%.

ASTM Grades

MaterialFittingsFlangesValvesBolts & Nuts
Carbon SteelA234 Gr WPAA105A216 Gr WCBA193 Gr B7
A194 Gr 2H
A234 Gr WPBA105A216 Gr WCB
A234 Gr WPCA105A216 Gr WCB
Carbon Steel
Alloy
High-Temp		A234 Gr WP1A182 Gr F1A217 Gr WC1A193 Gr B7
A194 Gr 2H
A234 Gr WP11A182 Gr F11A217 Gr WC6
A234 Gr WP12A182 Gr F12A217 Gr WC6
A234 Gr WP22A182 Gr F22A217 Gr WC9
A234 Gr WP5A182 Gr F5A217 Gr C5
A234 Gr WP9A182 Gr F9A217 Gr C12
Carbon Steel
Alloy Low-Temp		A420 Gr WPL6A350 Gr LF2A352 Gr LCBA320 Gr L7
A194 Gr 7
A420 Gr WPL3A350 Gr LF3A352 Gr LC3
Austenitic
Stainless
Steel		A403 Gr WP304A182 Gr F304A182 Gr F304A193 Gr B8
A194 Gr 8
A403 Gr WP316A182 Gr F316A182 Gr F316
A403 Gr WP321A182 Gr F321A182 Gr F321
A403 Gr WP347A182 Gr F347A182 Gr F347

ASTM Materials

FITTINGS

ASTM A234 = This specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction.
ASTM A420 = Standard specification for piping fittings of wrought carbon steel and alloy steel for low-temperature service.
ASTM A403 = Standard specification for wrought austenitic stainless steel piping fittings.

FLANGES

ASTM A105 = This specification covers standards for forged carbon steel piping components, that is, flanges, fittings, Valves, and similar parts, for use in pressure systems at ambient and higher-temperature service conditions.
ASTM A182 = This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.
ASTM A350 = This specification covers several grades of carbon and low alloy steel forged or ring-rolled flanges, forged fittings and Valves for low-temperature service.

VALVES

ASTM A216 = This specification covers carbon steel castings for Valves, flanges, fittings, or other pressure-containing parts for high-temperature service and of quality suitable for assembly with other castings or wrought-steel parts by fusion welding.
ASTM A217 = This specification covers steel castings, martensitic stainless steel and alloys steel castings for Valves, flanges, fittings, and other pressure-containing parts intended primarily for high-temperature and corrosive service.
ASTM A352 = This specification covers steel castings for Valves, flanges, fittings, and other pressure-containing parts intended primarily for low-temperature service.
ASTM A182 = This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.

BOLDS & NUTS

ASTM A193 = This specification covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
ASTM A320 = Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-Temperature Service.
ASTM A194 = Standard specification for nuts in many different material types.
  • Flange Tolerance
  • Tolerance For butt Welding Fittings
  • ANSI B36.19 & 36.10 Wall thickness & Outside diameter

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