Recommend Products
Name: Xiamen Stainless Steel Flange Material: Stainless Steel Standard: ANSI B16.5 Size: 1/2 to 24 Inch Pressure: 150LB to 2500LB Process Method: Forged Type: SO/ WN/ BL Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.QS Flange: Xiamen Stainless Steel Flange
Name: Butt Weld Flange Standard: ASME B16.5 Material: Carbon Steel Pressure: 150LB to 2500LB Size: 1/2 to 24 Inch Process Method: Forged Face: RF Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.QS Flange: Butt Weld Flange
Name: Pipe Floor Flange Material: Carbon Steel Standard: ASME B16.5 Pressure: 150LB to 2500LB Size: 1/2 to 24 Inch Process Method: Forged Face: RF Usage: Commonly Used in Water Systems, Oil and Gas pipelinesQS Flange: Pipe Floor Flange
Name: ASME B16.5 Blank Flange Type: BL Face: RF Standard: ASME B16.5 Process Method: Forged Material: Carbon Steel Pressure: 150LB Size: 1/2 to 24 Inch Usage: Commonly Used in Water Systems, Oil and Gas pipelinesQS Flange: ASME B16.5 Blank Flange
Metal Pipe Flange
QS Flange: Metal Pipe Flange
Name: Metal Pipe Flange
Standard: ASME B16.5
Material: Stainless Steel
Pressure: 150LB to 2500LB
Size: 1/2 to 24 Inch
Process Method: Forged
Face: RF
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.
Standard: ASME B16.5
Material: Stainless Steel
Pressure: 150LB to 2500LB
Size: 1/2 to 24 Inch
Process Method: Forged
Face: RF
Usage: Used in the Fields of Construction, Chemical Engineering, Petroleum and Natural Gas.
Quantity
Manufactured in compliance with ASME B16.5 standards, Metal Pipe Flange adopts stainless steel forging processes, covering pressure ratings from 150LB to 2500LB and sizes ranging from 1/2"to 24", with Raised Face (RF) sealing surfaces. Customization is available upon request. Renowned for its exceptional corrosion resistance, high strength, and superior sealing performance, Metal Pipe Flange is widely used in critical industries such as construction, chemical processing, oil & gas, ensuring safe and stable operation of pipeline systems under high pressure, high temperature, and harsh environments.
1. Core Process of Metal Pipe Flange – Solution Annealing
Solution annealing is a critical heat treatment process for austenitic stainless steel flanges (e.g., 304, 316, 321), directly impacting the corrosion resistance, mechanical properties, and weldability of Metal Pipe Flange.
Solution annealing is a critical heat treatment process for austenitic stainless steel flanges (e.g., 304, 316, 321), directly impacting the corrosion resistance, mechanical properties, and weldability of Metal Pipe Flange.
(1) Principle & Function of Solution Annealing
During high-temperature processing (e.g., forging, welding), chromium carbides (Cr23C6) precipitate in austenitic stainless steel, leading to chromium depletion at grain boundaries and intergranular corrosion (IGC). Metal Pipe Flange mitigates this issue through:
- Carbide Dissolution: Heating to 1050°C~1100°C fully dissolves carbides into the austenitic matrix.
During high-temperature processing (e.g., forging, welding), chromium carbides (Cr23C6) precipitate in austenitic stainless steel, leading to chromium depletion at grain boundaries and intergranular corrosion (IGC). Metal Pipe Flange mitigates this issue through:
- Carbide Dissolution: Heating to 1050°C~1100°C fully dissolves carbides into the austenitic matrix.
- Rapid Cooling (Water Quenching): Prevents carbide re-precipitation, ensuring homogeneous single-phase austenitic microstructure.
- Stress Relief: Eliminates residual stresses from cold working/welding, avoiding stress corrosion cracking (SCC).
(2) Key Parameters of Solution Annealing for Metal Pipe Flange (Per ASTM A480/A961)
| Parameter | Technical Requirement | Standard Reference |
| Heating Temp. | 1040°C~1100°C** (304: 1040°C~1080°C; 316L: 1050°C~1100°C) | Excessive low temp. leaves undissolved carbides; excessive high temp. causes grain coarsening (ASTM E112 grain size ≥Grade 5) |
| Soaking Time | 1–3 minutes per mm thickness (e.g., 30–60 mins for 20mm-thick flanges) | Ensures uniform heating & complete carbide diffusion (ASM Handbook Vol.4: Heat Treating) |
| Cooling Rate | Water quenching ≥30°C/s (or cooling from 1050°C to 500°C within 3 mins) | Avoids carbide precipitation in sensitization range (500°C~850°C) (ASTM A262 Practice E) |
| Atmosphere | Inert gas (e.g., Ar) or vacuum furnace (Ti-stabilized steels like 321 require Ar shielding) | Surface oxide layer ≤0.02mm (EN 10088-2) |
2. Critical Production Controls for Metal Pipe Flange
To ensure high-quality Metal Pipe Flange, the following processes must be strictly controlled:
To ensure high-quality Metal Pipe Flange, the following processes must be strictly controlled:
(1) Heating & Cooling Equipment
- Heating Equipment:
- Electric furnace (PID-controlled ±5°C) or gas furnace (with O₂ sensors to prevent decarburization).
- Thermocouple calibration (AMS 2750E Class 1 compliant).
- Heating Equipment:
- Electric furnace (PID-controlled ±5°C) or gas furnace (with O₂ sensors to prevent decarburization).
- Thermocouple calibration (AMS 2750E Class 1 compliant).
- Cooling System:
- Quench tank volume ≥5× workpiece volume, with circulation pump flow ≥50m³/h (prevents localized water heating).
- Water quality: Chloride (Cl⁻) ≤25ppm (prevents pitting corrosion).
- Quench tank volume ≥5× workpiece volume, with circulation pump flow ≥50m³/h (prevents localized water heating).
- Water quality: Chloride (Cl⁻) ≤25ppm (prevents pitting corrosion).
(2) Deformation Control
- Large flanges (DN≥300mm) require fixturing during quenching to maintain straightness ≤0.5mm/m (ISO 9445).
- Large flanges (DN≥300mm) require fixturing during quenching to maintain straightness ≤0.5mm/m (ISO 9445).
3. Quality Verification of Metal Pipe Flange
(1) Corrosion Resistance Tests
- ASTM A262 Practice E (Strauss Test): No intergranular cracking in bent specimens.
- ASTM G48 Method A (Ferric Chloride Test): 316L flanges show no pitting after 72h in 6% FeCl₃ solution.
(1) Corrosion Resistance Tests
- ASTM A262 Practice E (Strauss Test): No intergranular cracking in bent specimens.
- ASTM G48 Method A (Ferric Chloride Test): 316L flanges show no pitting after 72h in 6% FeCl₃ solution.
(2) Metallographic Analysis
- Grain Size: ASTM E112 ≥Grade 5 (avg. grain size ≤100μm).
- Carbide Residue: SEM-EDS confirms grain boundary Cr ≥16% (EN ISO 3651-2).
- Grain Size: ASTM E112 ≥Grade 5 (avg. grain size ≤100μm).
- Carbide Residue: SEM-EDS confirms grain boundary Cr ≥16% (EN ISO 3651-2).
4. Special Material Treatments for Metal Pipe Flange
(1) Ultra-Low Carbon Stainless Steel (316L)
- Post-annealing, avoid reheating to 450°C~850°C (e.g., welding interpass temp. ≤150°C).
(1) Ultra-Low Carbon Stainless Steel (316L)
- Post-annealing, avoid reheating to 450°C~850°C (e.g., welding interpass temp. ≤150°C).
(2) Ti/Nb-Stabilized Steels (321/347)
- Stabilization annealing (850°C×2h) after solution annealing to promote TiC/NbC formation.
- Stabilization annealing (850°C×2h) after solution annealing to promote TiC/NbC formation.
5. Common Issues & Solutions for Metal Pipe Flange
(1) Sealing Face Distortion Post-Quenching
- Solution: Step quenching (air-cool to 800°C before water quenching) or 0.3mm machining allowance.
(1) Sealing Face Distortion Post-Quenching
- Solution: Step quenching (air-cool to 800°C before water quenching) or 0.3mm machining allowance.
(2) Microcracks After Water Quenching
- Solution: Control water temp. ≤40°C or switch to polymer quenchants (e.g., PAG solution).
- Solution: Control water temp. ≤40°C or switch to polymer quenchants (e.g., PAG solution).
Send Message
