SA266 Gr. 4 Forging Ring DISC Manufacturer
SA266 Grade 4 Flanges – High-Strength Forged Steel forging parts for Pressure Applications
SA-266 SA-266M is Standard Specification for Carbon Steel Forgings for Pressure Vessel Components
This specification2 covers four grades of carbon steel forgings for boilers, pressure vessels, and associated equipment.
NOTE 1—Designations have been changed as follows:
Current Formerly
Grade 1 Class 1
Grade 2 Class 2
Grade 3 Class 3
Grade 4 Class 4
SA266 Grade 4 Forgings are a top choice for industries requiring superior strength and performance under high-pressure and high-temperature conditions. Manufactured from carbon-manganese steel, these flanges offer excellent mechanical properties, weldability, and durability—ideal for critical piping and vessel systems.
SA266 Grade 4 Chemical Requirements
| Element | Composition, % (Grades 1 and 2) | Composition, % (Grade 3) | Composition, % (Grade 4) |
|---|---|---|---|
| Carbon, max | 0.30 | 0.35 | 0.30 |
| Manganese | 0.40–1.05 | 0.80–1.35 | 0.80–1.35 |
| Phosphorus, max | 0.025 | 0.025 | 0.025 |
| Sulfur, max | 0.025 | 0.025 | 0.025 |
| Silicon | 0.15–0.35 | 0.15–0.35 | 0.15–0.35 |
SA266 Grade 4 Tensile Requirements
| Property | Grade 1 | Grades 2 and 4 | Grade 3 |
|---|---|---|---|
| Tensile strength, min, ksi [MPa] | 60–85 [415–585] | 70–95 [485–655] | 75–100 [515–690] |
| Yield strength (0.2 % offset), min, ksi [MPa] | 30 [205] | 36 [250] | 37.5 [260] |
| Elongation in 2 in. [62.5 mm], min, % | 23 [21] | 20 [18] | 19 [17] |
| Reduction of area, min, % | 38 | 33 | 30 |
SA266 Gr. 4 Forging Material specification
Material: ASME SA266 Gr. 4 / ASTM A266 Grade 4
Type: Forged steel flanges – Weld Neck (WN), Blaind (BL), Slip-On (SO), Socket Weld (SW), Threaded (TH)
Forged disc,Forged ring,forged tubesheet,
Size Range: ½” to 60”,customized size
Pressure Ratings: Class 150 to 2500 (ANSI B16.5 / B16.47 Series A & B)
Standards: ASME, ANSI, ASTM, DIN, EN, JIS, GOST
ASTM A266 grade 4 Testing & Certification:
All SA266 Grade 4 flanges are supplied with:
- Mill Test Certificates (EN 10204 3.1 or 3.2)
- Ultrasonic & Radiographic Test reports (on request)
- PMI, Hardness, Impact, and Mechanical Test Reports
Looking for reliable, high-performance SA266 Grade 4 forged flanges for pressure vessel applications,contact us for any support.
