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. 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;
We also provide other similar material grade, such as the JIS Standard, DIN Standard, GB Standard, for detailed information, please feel free contact with us by E-mail.
| General Classification | "ASTM" Symbols | Service | |
| Casting | Forgings | Temp | |
| High-Temperature | |||
| Cast Iron | A126-Class B | 250° C | |
| Cast Iron | A126-Class C | 250° C | |
| Carbon Steel | A216-WCA | 420° C | |
| Carbon Steel | A216-WCB | A105 | 420° C |
| 1/2Mo Steel | A217-WC1 | A182-F1 | 500° C |
| 1¼Cr-1/2Mo | A217-WC6 | A182-F11 | 550° C |
| 2¼Cr-1Mo | A217-WC9 | A182-F22 | 600° C |
| 5Cr1/2Mo | A217-C5 | A182-F5a | 600° C |
| 9Cr-1Mo | A217-C12 | A182-F9 | 650° C |
| Low-Temperature | |||
| Al Stel | A352-LCB,LCC | A350-LF2 | -46° C |
| 1/2 Mo Steel | A352-LC1 | -60° C | |
| 2½ Ni Steel | A352-LC2 | -73° C | |
| 3½ Ni Steel | A352-LC3 | A350-LF3 | -101° C |
| Stainless Steel | |||
| 13Cr-1/2Mo | A217-CA15 | A182-F6a | 550° C |
| 18Cr-8Ni(Co.03) | A351-CF3 | A182-F304L | F304L 800° C |
| 18Cr-8Ni(Co.08) | A351-CF8 | A182-F304 | F304 800° C |
| 18Cr-8Ni-2Mo(Co.03) | A351-CF3M | A182-F316L | F316L 800° C |
| 18Cr-8Ni-2Mo(Co.08) | A351-CF8M | A182-F316 | F316 800° C |
| 18Cr-8Ni-Ti | A182-F321 | F321 800° C | |
| 18Cr-8Ni-Cb | A351-CF8M | A182-F347 | F347 800° C |
| 22Cr-12Ni | A351-CH20 | 1200° C | |
| 23Cr-19Ni | A351-CK20 | 1200° C | |
| 19Cr-27Ni-2Mo-3Cu | A351-CN7M | 1200° C | |