Inconel 625 Ring Joint Gaskets,UNS N06625 API RX,BX Ring gasket,
Ring joint gasket is machined from solid metal in a variety of shapes according to API 6A & ASME B16.20 standards,it’s designed for high pressure ,high temperature or highly corrosive applications by selecting the most suitable material and shape. It is designed to with stand exceptionally high assembly loads over a small area, thus producing high seating stresses
Inconel Alloy 625 is a low carbon (0.03%) nickel-chromium-molybdenum-niobium alloy which has excellent corrosion resistance to a wide range of corrosive media. Alloy 625 is normally supplied in annealed condition for wet corrosion applications 。
Chemical composition of Inconel 625
Ring Type Joints
Metallic ring joint gaskets are heavy duty, high-pressure gaskets largely used in offshore and onshore petrochemical applications. They are precision-engineered components designed to be used in conjunction with precision-machined flanges. All our Ring Joints are manufactured according to ASME B16.20 and API-6A-Flange-Bolt-API-Ring-GASKET
The gasket material is selected on a number of grounds primarily; chemical compatibility with the media and the hardness of the flange. The gasket material ideally needs to be roughly 30 Brinell less than the flange material to ensure sufficient deformation of the gasket without damaging the flange facing.
Worn, pitted or corroded flange sealing surfaces can impede the sealing ability of RTJ gaskets. In such instances, a serrated octagonal RTJ gasket, covered with flexible graphite or a Maxiflex CR-RJ, can provide a temporary or emergency solution until the flange can be repaired or replaced.
A number of ring joint styles are available designed for specific flange types, these are:
Type R Oval & Octagonal
–NB1/2″ to 24″ Class Rating 150 to 2500 ASME B16.20
–NB26″ to 36″ Class 300 to 900 ASME B16.20 Series A
–NB1/2″ to 20″ Class API 6A
The original ring joint design
R Oval & Octagonal gasket ring Can be used on standard flat bottomed groove flanges and
older round bottomed groove flanges
R Oval & Octagonal gasket ring Can be used for ASME B16.5 flange class 150 to 2500 and
API 6B to Class 5000
»Soft iron and carbon steel gaskets are zinc plated to prevent
corrosion
» All rings are marked with the ring number, material and the
date of manufacture and API designation.
Type RX
–NB1 1/2″ to 24″ Class Rating 720 to 5000 ASME B16.20
–NB26″ to 36″ Class Rating 300 to 900 ASME B16.20 Series A
–NB1 1/2″ to 20″ Class Rating API 6A
Interchangeable with Type R gaskets
» Pressure energised; as the internal pressure increases the
sealing force increases
» The outer sealing faces make initial contact with the slightly
» smaller flange groove allowing the gasket to impart
» additional sealing force
» Can be drilled with additional hole to create a gasket suitable
for subsea installation Type “SRX”
» Suitable for use on ASME B16.5, API 6B to Class 5000 and
ASME B16.47 Series A flanges
Type BX
–NB1 11/16″ to 21 1/4″ Class Rating 5000 to 20000 ASME B16.20
» BX Ring gasket Suitable for use on API 6BX Flanges up to Class 20000
» During installation the ring is compressed inwards to provide
additional sealing stress
» Pressure energised; as the internal pressure increases the
sealing force increases
» Type BX rings are supplied with pressure relief holes to avoid
compressing fluid beneath the gasket
» Can be drilled with additional hole to create a gasket suitable
for subsea installation Type “SBX”
| Common Materials | |||
|---|---|---|---|
| Material | Brinell Hardness | Temperature Limitations | Identification |
| Soft Iron | 90 | -60 to +400 °C | D |
| Low carbon steel | 120 | -40 to +500°C | S |
| 4%-6% Cr ½% Mo:F5 | 130 | -125 to +500°C | F5 |
| Stainless steel 304/304L | 160 | -250 to +650°C | S304 or 304L |
| Stainless steel 316/316L | 160 | -196 to +800°C | S316 or 316L |
| Stainless steel 321 | 160 | -250 to +870°C | S321 |
| Stainless steel 347 | 160 | -250 to +870°C | S347 |
| Stainless steel 410 | 170 | -20 to +500°C | S410 |
| Inconel 625 | – | 1000°C | 625 |
| Incoloy 825 | – | 1000°C | 825 |
| Hastelloy C-276 | – | 1000°C | C-276 |
| Duplex | – | 800°C | S31803 |
| Titanium | – | 540°C | TI |
The sealing surfaces on the ring joint grooves must be smoothly finished to 63 Microinches and be free of objectionable ridges, tool or chatter marks.
Ring Gasket Material and Marking.
| Material | Maximum Hardness | Mark |
| Soft Iron Ring Gasket | 56 HRB | D-4* |
| Carbon and low-alloy steel Ring Gasket | 68 HRB | S-4* |
| 304 stainless steel Ring Gasket | 83 HRB | S304-4 |
| 316 stainless steel Ring Gasket | 83 HRB | S316-4 |
| Nickel alloy UNS N08825 Ring Gasket | 92 HRB | 825-4 |
| Other CRA materials | Hardness shall meet manufacturer’s written specification. | UNS number-4 |
The following Ring Type Joint styles are available:
Ring joint gasketsTolerances (Inches)
1.”A” Width of ring: +/-0.008
2.”B” “H” Height of ring: +/-0.020
3.”P” Average pitch diameter of ring: +/-0.007
Special Alloy Gasket
| Material |
| Hastelloy B, C, C-22, C276, D, |
| Incolloy 800, 825 |
| Inconel 600, 601, 625 |
| Monel 400,Monel K500 |
How to order our N06625 ring gasket ？
OCT. RING TYPE GASKET INCONEL 625 1/2″-600# (R11)
OCT. RING TYPE GASKET INCONEL 625 2″-600# (R23)
