Materials
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The gasket material should be selected to suit the service conditions. It is always recommended that the gasket material be softer than the mating flanges. The popular ring joint materials with recommended maximum hardness and identification as specified in API 6A, are show in the table below. For more highly specialized applications, ring joints can be machined from DUPLEX steels and other exotic materials such as Monel®, Inconel® Incoloy®, and Hastelloy®.
| Material | Werkstoff Number | Maximum Brinell* | Hardness Rockwell Bt | Identification |
| SOFT IRON | 90 | 50 | D | |
| LOW CARBON STEEL | 120 | 68 | S | |
| 4-6% CHROME _% MOLY | 130 | 72 | F5 | |
| TYPE 304 STAINLESS STEEL | 1.4301 | 160 | 83 | S304 |
| TYPE 316 STAINLESS STEEL | 1.4401 | 160 | 83 | S316 |
| TYPE 347 STAINLESS STEEL | 1.4550 | 160 | 83 | S347 |
| TYPE 410 STAINLESS STEEL | 1.4006 | 170 | 86 | S410 |
* Measured with 3000 Kg load except soft iron which is measured with 500 Kg load.
t Measured with 100 Kg load and 1/16 inch diameter ball.
As with all metallic joints, the re-use of Ring Joint gaskets is not recommended. Work hardening of the material occurs during assembly and use. With subsequent re-use, increased bolt loads are required to achieve similar sealing performance. Flange indentations also may result.
725 North Drennan
Houston, Texas 77003-1320
Telephone: 713-356-3500
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725 North Drennan
Houston, Texas 77003-1320
Telephone: 713-356-3560
Toll Free: 1-800-231-6355
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Gardena, California 90248
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