The Class 300 Long Weld Neck Flange Raised Face is widely used in industrial piping systems to connect pipes securely and handle various operating conditions. These flanges come in multiple materials, including Titanium Grades 2, 5, and 7, as well as Carbon Steel and Stainless Steel. Each material offers distinct advantages in terms of strength, corrosion resistance, and suitability for specific applications. Understanding these differences is essential when selecting the right flange material for a particular application.
This article explores the properties and advantages of these materials, and a comparison table will be provided to highlight the key differences between Titanium Grades 2, 5, 7, Carbon Steel, and Stainless Steel.
Property | Titanium Grade 2 | Titanium Grade 5 | Titanium Grade 7 | Carbon Steel | Stainless Steel |
---|---|---|---|---|---|
Composition | 99% Titanium | 90% Titanium, 6% Aluminum, 4% Vanadium | 90% Titanium, 6% Aluminum, 2% Palladium | Iron + Carbon | Iron + Chromium (10-20%) + Nickel |
Corrosion Resistance | Excellent (especially in chlorides, seawater) | Excellent (better high-temperature resistance) | Excellent (higher corrosion resistance in acidic environments) | Poor (rusts easily in moisture, acids) | Excellent (against oxidizing acids, chlorides) |
Tensile Strength | Moderate | High (stronger than Grade 2) | Moderate to High | Moderate | High |
Fatigue Resistance | Moderate | Excellent | High | Low | Good |
Temperature Resistance | Moderate | High (better heat resistance) | High (oxidation resistance) | Low | Moderate |
Applications | Marine, Chemical, Medical | Aerospace, Military, Chemical Processing | Chemical Processing (aggressive environments) | General Industry, Construction | Chemical, Food Processing, Medical |
Advantages | Corrosion resistance, Weldability | Strength, High-performance, Heat resistance | Enhanced corrosion resistance, Weldability | Cost-effective, Strength | Durability, Corrosion resistance |
Cost | Expensive | Expensive | Expensive | Low | Moderate to High |
When selecting the Class 300 Long Weld Neck Flange Raised Face, the choice of material largely depends on the operating conditions and the specific application:
Titanium Grades (2, 5, 7):
Carbon Steel:
Stainless Steel:
Size in Inch | Size in mm | Outer Dia. | Flange Thick. | Hub OD | Weld Neck OD | RF Dia. | RF Height | PCD | Hub Length | No of Bolts | Bolt Size UNC | Machine Bolt Length | RF Stud Length | Hole Size | ISO Stud Size |
A | B | C | D | E | F | G | H | ||||||||
1/2 | 15 | 95 | 12.7 | 38 | 21.3 | 34.9 | 2 | 66.7 | As Required | 4 | 1/2 | 55 | 65 | 5/8 | M14 |
3/4 | 20 | 115 | 14.3 | 48 | 26.7 | 42.9 | 2 | 82.6 | As Required | 4 | 5/8 | 65 | 75 | 3/4 | M16 |
1 | 25 | 125 | 15.9 | 54 | 33.4 | 50.8 | 2 | 88.9 | As Required | 4 | 5/8 | 65 | 75 | 3/4 | M16 |
1 1/4 | 32 | 135 | 17.5 | 64 | 42.2 | 63.5 | 2 | 98.4 | As Required | 4 | 5/8 | 70 | 85 | 3/4 | M16 |
1 1/2 | 40 | 155 | 19.1 | 70 | 48.3 | 73 | 2 | 114.3 | As Required | 4 | 3/4 | 75 | 90 | 7/8 | M20 |
2 | 50 | 165 | 20.7 | 84 | 60.3 | 92.1 | 2 | 127 | As Required | 8 | 5/8 | 75 | 90 | 3/4 | M16 |
2 1/2 | 65 | 190 | 23.9 | 100 | 73 | 104.8 | 2 | 149.2 | As Required | 8 | 3/4 | 85 | 100 | 7/8 | M20 |
3 | 80 | 210 | 27 | 117 | 88.9 | 127 | 2 | 168.3 | As Required | 8 | 3/4 | 90 | 110 | 7/8 | M20 |
3 1/2 | 90 | 230 | 28.6 | 133 | 101.6 | 139.7 | 2 | 184.2 | As Required | 8 | 3/4 | 95 | 110 | 7/8 | M20 |
4 | 100 | 255 | 30.2 | 146 | 114.3 | 157.2 | 2 | 200 | As Required | 8 | 3/4 | 95 | 115 | 7/8 | M20 |
5 | 125 | 280 | 33.4 | 178 | 141.3 | 185.7 | 2 | 235 | As Required | 8 | 3/4 | 110 | 120 | 7/8 | M20 |
6 | 150 | 320 | 35 | 206 | 168.3 | 215.9 | 2 | 269.9 | As Required | 12 | 3/4 | 110 | 120 | 7/8 | M20 |
8 | 200 | 380 | 39.7 | 260 | 219.1 | 269.9 | 2 | 330.2 | As Required | 12 | 7/8 | 120 | 140 | 1 | M24 |
10 | 250 | 445 | 46.1 | 321 | 273 | 323.8 | 2 | 387.4 | As Required | 16 | 1 | 140 | 160 | 1 1/8 | M27 |
12 | 300 | 520 | 49.3 | 375 | 323.8 | 381 | 2 | 450.8 | As Required | 16 | 1 1/8 | 145 | 170 | 1 1/4 | M30 |
14 | 350 | 585 | 52.4 | 425 | 355.6 | 412.8 | 2 | 514.4 | As Required | 20 | 1 1/8 | 160 | 180 | 1 1/4 | M30 |
16 | 400 | 650 | 55.6 | 483 | 406.4 | 469.9 | 2 | 571.5 | As Required | 20 | 1 1/4 | 165 | 190 | 1 3/8 | M33 |
18 | 450 | 710 | 58.8 | 533 | 457 | 533.4 | 2 | 628.6 | As Required | 24 | 1 1/4 | 170 | 195 | 1 3/8 | M33 |
20 | 500 | 775 | 62 | 587 | 508 | 584.2 | 2 | 685.8 | As Required | 24 | 1 1/4 | 185 | 205 | 1 3/8 | M33 |
24 | 600 | 915 | 68.3 | 702 | 610 | 692.2 | 2 | 812.8 | As Required | 24 | 1 1/2 | 205 | 230 | 1 5/8 |
Material Selection: The first step in manufacturing titanium flanges involves selecting high-quality titanium alloys, either Grade 2 or Grade 5, based on the application’s specific requirements. Grade 2 is chosen for its excellent corrosion resistance and weldability, while Grade 5 is selected for higher strength demands.
Forming and Machining: The titanium billets are heated to a high temperature and then formed into flange shapes using techniques like forging or casting. Once the shape is formed, the flange undergoes precision machining to achieve the correct dimensions, including the raised face and bolt holes.
Heat Treatment: Both Grade 2 and Grade 5 titanium alloys may undergo heat treatment processes to enhance their mechanical properties. For Grade 5, this typically involves a solution treatment followed by aging to increase strength.
Surface Finishing: The flange surfaces, especially the raised face, are polished to a smooth finish to improve the sealing surface when paired with gaskets. This step is critical to ensuring leak-tight performance and meeting the required surface finish standards.
Inspection and Testing: Each flange is subjected to rigorous quality control, including visual inspections, dimensional checks, and non-destructive testing such as ultrasonic or X-ray inspection to ensure there are no internal defects. Pressure testing may also be performed to verify the flange’s ability to withstand the specified pressure rating.