Guaranteed on time delivery
Gayatri Tubes is the unparalleled manufacturer, exporter, and supplier of Alloy Steel F91 Flanges. We ensure the quality of the products before and after we manufacture it so that it can comply with the industries and ensure the top-notch quality. Furthermore, we also ensure that we use a lesser amount of Hydrochloric acids.
These categories of flanges are better in comparison to the other forms of steels in the category of austenitic steels which means that they are better than the austenitic steels. They have included nickel and molybdenum in their alloying content. We make them using the highest quality of raw materials and ensure that it is economically affordable as well.
There is an operation that we conduct on these flanges which is known as the melting operation which is conducted with the help of ferrochromium. Furthermore, there is an addition of chromium which has an approximate concentration of around 11 to 18 percent.
We also conduct a process of hardening of the flanges with the help of a well-known process which is called heat treatment. These flanges have a good resistance against the corrosive conditions and do not get corroded or catch corrosion easily. They are used in a large number of products such as in cutleries, wrenches, turbines, and surgical instruments as well. They have various kinds of product ranges and one such range is the blind flanges which are used in various industries due to their excellent resistance against the environments that can cause corrosion on the surface of the flanges such as the acidic environments.
There is one more variants as well which is known as the lap joint flanges and it is also falling under the category of Alloy Steel F91 Flanges. This variant is also used a lot because of its excellent properties such as the superior resistant against the corrosive acids that is due to the added content of the copper. The products that we manufacture are ensured to follow all the standards both national as well as international. Moreover, they are also tested with various testing schemes so that they can ensure the quality while being used.
| STANDARD | UNS | WERKSTOFF NR. |
| Alloy Steel F91 | K90901 | 1.4903 |
| Specifications | ASTM A182 / ASME SA182 |
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Size | 1/2″NB TO 60″NB |
| Flange Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| DIN Flanges | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 |
| JIS Flanges | JIS B2220 5K, JIS B2220 10K, JIS B2220 16K, JIS B2220 20K |
| BS Flanges | BS4504 PN 6, BS 4504 PN 10, BS4504 PN 16, BS4504 PN 25, BS4504 PN 40, BS 4504 PN 64, BS 4504 PN 100, BS 4504 PN 160, BS 4504 PN 250, BS 10, BS Table D, BS Table E, BS Table F, BS Table H. |
| Grade | C | Mn | P | S | Si | Ni | Ch | Mo | Cb | N |
| F91 | 0.08-0.12 | 0.30-0.60 | 0.020 | 0.010 | 0.20-0.50 | 0.40 | 8.0-9.5 | 0.85-1.05 | 0.06-0.10 | 0.03-0.07 |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| F91 | 585 | 415 | 20 | - | 248 max |
