347H stainless steel (UNS S34709) is specifically engineered for elevated temperature service, with its stabilized columbium content providing exceptional resistance to sensitization and intergranular corrosion. This material maintains superior creep strength and oxidation resistance at temperatures exceeding 1,500°F, making it indispensable for power generation, petrochemical processing, and aerospace applications where failure is not an option.
Forged 347H Stainless Steel Pipe Cap Specifications
The production of our forged 347H stainless steel pipe caps is governed by exacting material and dimensional standards to guarantee performance under stress and extreme temperatures.
|
Specification Category |
Details |
|
Material Standard |
ASTM A182 / ASME SA182 |
|
Dimensional Standard |
ASME B16.11 (Primary), MSS SP-79, MSS SP-83, MSS SP-97 |
|
Pressure Class |
Threaded: 2000, 3000, 6000 LBS |
|
Standard Size Range (Forged) |
1/8" NB to 4" NB (DN6 to DN100) |
|
Connection Types |
Threaded (NPT, BSPT, BSPP) and Socket Weld |
Detailed Size Specification Table
To assist your engineering team in material selection, below is the matrix of our production capabilities for 347H Forged Caps:
|
Nominal Pipe Size (NPS) |
Connection Type |
Pressure Class Availability |
End-to-End Length (Approx. mm) |
|
1/2" (DN15) |
SW / NPT |
3000 / 6000 |
25 - 32 |
|
3/4" (DN20) |
SW / NPT |
3000 / 6000 |
27 - 38 |
|
1" (DN25) |
SW / NPT |
3000 / 6000 |
33 - 44 |
|
1-1/2" (DN40) |
SW / NPT |
3000 / 6000 |
39 - 51 |
|
2" (DN50) |
SW / NPT |
3000 / 6000 |
45 - 64 |
|
3" (DN80) |
SW / NPT |
3000 / 6000 |
58 - 70 |
|
4" (DN100) |
SW / NPT |
3000 (Standard) |
65 - 80 |
Technical Note: For sizes larger than 4", we typically transition to ASME B16.9 Butt-Weld Caps (Seamless/Formed). However, if your project requires a custom Forged Cap >4" for a specific high-pressure vessel header, our custom forging division can machine these from solid billets up to 12" upon review of technical drawings.
Forged vs. Buttweld Pipe Cap Manufacturing
A crucial point for engineers and procurement specialists is the fundamental distinction between forged and buttweld fittings, which dictates their available size ranges and suitable applications.
|
Feature |
Forged Fittings (ASME B16.11) |
Buttweld Fittings (ASME B16.9) |
|
Primary Manufacturing Method |
Heated and shaped under pressure (forged) for high strength. |
Formed from pipe or plate (wrought) and welded. |
|
Typical Size Range |
1/8" NB to 4" NB (up to DN100). |
1/2" NB to 48" NB and larger. |
|
End Connections |
Threaded or Socket Weld. |
Butt Weld (beveled ends for welding directly to pipe). |
|
Typical Pressure Service |
High-pressure systems (2000 to 9000 LBS classes). |
Broad range, from low to high pressure, depending on wall schedule. |
|
Key Standard |
ASME B16.11. |
ASME B16.9. |
This means our forged 347H pipe caps are supplied in the standard forged size range of up to 4 inches. For larger diameter piping systems requiring caps, buttweld caps (to ASTM A403/ASME SA403) would be the appropriate specification.
Our Manufacturing and Quality Commitment
Our forged 347H caps are produced under strict quality control protocols. We use advanced forging techniques that create a uniform grain structure, enhancing the fitting's strength, impact toughness, and fatigue resistance.
Full Traceability: We provide complete material traceability from raw material to finished goods.
Certification: All products are supplied with a Material Test Certificate (MTC) compliant with EN 10204 3.1/3.2. Certifications for NACE MR0103/MR0175 (for sour service) are also available.
Testing: Our fittings undergo rigorous testing, including hardness tests, tensile tests, and intergranular corrosion tests to ensure they meet specified mechanical properties and corrosion resistance standards.
Technical Support and Engineering Collaboration
Our commitment extends beyond dimensional compliance. Our metallurgical team provides:
Application-Specific Design Review: Free consultation on pressure-temperature ratings and material selection.
Custom Dimensional Drawings: CAD-ready specifications within 24 hours of inquiry.
Failure Analysis Support: Root cause analysis for existing system failures.
Regulatory Compliance Documentation: Complete ASME Section II, Part D documentation packages.
Conclusion
In high-stakes environments, the integrity of your piping system is defined by its weakest link. A pipe cap might seem like a minor accessory, but under 6000 PSI of pressure at $600^{\circ}\text{C}$, it is a critical safety component.
Our factory stands ready to supply Forged 347H Caps that fit your exact dimensional needs and exceed your quality expectations.
