1.4529 1.4532 Stainless Steel Threaded Pipe Fittings
Product Name: 1.4529 / 1.4532 Stainless Steel Threaded Fittings
Equivalent Grades: 1.4529: UNS N08926 / Alloy 926; 1.4532: UNS S31254 / 254 SMO
Standards: ASME B16.11 / MSS SP-114 / EN 10241 / EN 10242
Fitting Types: Threaded Elbows, Threaded Tees
Manufacturing Process: Forging / Precision Casting / Machining
Connection Types: NPT, BSPT, BSPP, PT Threads
Thread Standards: ASME B1.20.1 NPT / ISO 7-1 BSPT / ISO 228 BSPP
Size Range: 1/8" – 4" (DN6 – DN100)
Pressure Class: Class 150, 3000, 6000, 9000 (per design requirements)
Wall Thickness: Compliant with ASME B16.11 pressure class requirements
Surface Finish: Pickling & Passivation / Machined Finish / Custom Finish
Heat Treatment: Solution Annealing
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of 1.4529 1.4532 stainless steel threaded pipe fittings in China. With abundant experience, we warmly welcome you to wholesale customized 1.4529 1.4532 stainless steel threaded pipe fittings from our factory. For price consultation, contact us.
What are 1.4529 and 1.4532 stainless steel threaded fittings?
1.4529 (Alloy 926/6Mo/UNS N08926) is a super-austenitic stainless steel containing 19.0–21.0% Cr, 24.0–26.0% Ni, and 6.0–7.0% Mo, with a Pitting Resistance Equivalent Number (PREN) > 43; it is specifically designed for environments involving extremely high chloride levels and acidic corrosion.
1.4532 (PH15-7 Mo/UNS S15700) is a semi-austenitic precipitation-hardening stainless steel containing 14.0–16.0% Cr, 6.5–7.5% Ni, and 2.0–3.0% Mo; following age hardening, it achieves a tensile strength exceeding 1200 MPa, making it suitable for high-pressure, high-load threaded piping systems that require both ultra-high mechanical strength and corrosion resistance.
What is the pressure rating for 1.4529 / 1.4532 threaded fittings?
In accordance with the ASME B16.11 standard for forged fittings, threaded pipe fittings are primarily categorized as follows:
Class 2000 (2000LB): Suitable for medium-to-high-pressure industrial piping systems.
Class 3000 (3000LB): The most common industrial pressure rating; the allowable working pressure at ambient temperature can reach 20–25 MPa.
Class 6000 (6000LB): An ultra-high-pressure rating; high-strength 1.4532 precipitation-hardening material is typically preferred for use with extra-heavy wall thickness.
In which industrial sectors are 1.4529 and 1.4532 threaded fittings primarily used?
1.4529: Flue gas desulfurization (FGD) systems (spray piping); high-pressure pumps and instrumentation piping for seawater desalination; phosphoric acid production equipment; and piping for strong-acid media in fine chemical processing.
1.4532: High-pressure hydraulic piping for aerospace applications; high-pressure valve connections for offshore oil and gas wellheads; and high-stress, explosion-proof threaded fittings.
1.4529 & 1.4532 Threaded Pipe Fittings Specification
| Feature | 1.4529 (UNS N08926) | 1.4532 (XM-19 / S20910) |
| Material Category | 6% Moly Super Austenitic | High-Strength Nitrogen-Strengthened |
| Common Standard | ASTM B649 / B366 | ASTM A479 / A276 |
| Threads Standard | ASME B1.20.1 (NPT) / ISO 7-1 (BSPT) | ASME B1.20.1 (NPT) / ISO 7-1 (BSPT) |
| Pressure Rating | Class 2000 / 3000 / 6000 | Class 3000 / 6000 |
| Fitting Types | Elbow, Tee, Union, Coupling, Plug, Bushing | Elbow, Tee, Union, Coupling, Plug, Bushing |
| Surface Finish | Pickled or Passivated | Machined / Passivated |
| Typical Applications | Desalination, Offshore, Chemical | Pumps, Valves, Marine Hardware |
Chemical Composition
| Element | 1.4529 (UNS N08926 / Alloy 926) | 1.4532 (UNS S31254 / 254 SMO) |
|---|---|---|
| Cr (Chromium) | 19.0 – 21.0% | 19.5 – 20.5% |
| Ni (Nickel) | 24.0 – 26.0% | 17.5 – 18.5% |
| Mo (Molybdenum) | 6.0 – 7.0% | 6.0 – 6.5% |
| Cu (Copper) | 0.5 – 1.5% | ≤0.75% |
| N (Nitrogen) | 0.15 – 0.25% | 0.18 – 0.22% |
| PREN Value | ≥40 | ≥42 |
Mechanical Properties Reference
| Mechanical Property | 1.4529 (Alloy 926) | 1.4532 (254 SMO) |
|---|---|---|
| Tensile Strength (Rm) | ≥650 MPa | ≥650 MPa |
| Yield Strength (Rp0.2) | ≥295 MPa | ≥300 MPa |
| Elongation (A%) | ≥35% | ≥35% |
| Hardness | ≤35 HRC (Typical) | ≤35 HRC (Typical) |
| Density | Approx. 8.1 g/cm³ | Approx. 8.0 g/cm³ |
Customer Case
FAQ
Q: What pressure ratings do these fittings typically support?
A: They are generally available in Class 3000 and Class 6000 ratings, in accordance with the ASME B16.11 standard. The specific pressure rating depends on the fitting's wall thickness and size.
Q: Is "galling" a concern when using these materials?
A: Yes. High-alloy materials are more prone to galling than 316L. It is standard practice to use thread lubricants-such as nickel-based or molybdenum disulfide anti-seize compounds-to prevent the threads from seizing during assembly.
Q: Is 1.4529 suitable for sour gas environments (NACE service)?
A: Yes. 1.4529 is commonly used in environments compliant with NACE MR0175/ISO 15156 standards. If your project involves the oil and gas industry, be sure to explicitly specify "NACE compliance" when requesting a quote.
Q: Do I need a Mill Test Certificate (MTC)?
A: It is highly recommended. For high-performance materials, you should always request an MTC compliant with EN 10204 3.1. This document verifies the material's chemical composition (crucial for the 6% molybdenum content in 1.4529 steel) and its mechanical properties.
Q: What are the typical lead times for these materials?
A: Unlike standard stock items like 316L, 1.4529 and 1.4532 are usually made-to-order (MTO) or require specific raw material procurement. Depending on the order quantity and specific forging requirements, lead times can range from 4 to 12 weeks.
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