Womic Stainless Steel Co., Ltd
Exceptional Pitting Resistance (PRE ≥ 45): Outperforms all stainless and duplex in chloride pitting.
High Strength: Yield strength ≥ 415 MPa in annealed condition; cold worked options available.
Excellent Seawater Compatibility: No crevice corrosion, even in stagnant seawater.
Broad Temperature Range: -196°C to 980°C.
NACE MR0175 Compliant: Sour service up to 232°C.
Full Range: Butt-weld (ASME B16.9), socket-weld (B16.11), threaded (NPT).
International Certifications: ABS, BV, DNV, LR, NORSOK M-650, NACE MR0175.
|
Standard |
Application |
Alloy 625 Grade |
|
ASME B16.9 |
Industrial butt-welding fittings (BW) |
UNS N06625 (WP625) |
|
ASME B16.11 |
Socket-welding and threaded fittings (SW / NPT) |
UNS N06625 |
|
ASTM B366 |
Factory-made wrought nickel alloy fittings |
WPN6 625 |
|
MSS SP-43 |
Light-wall butt-welding fittings |
N06625 |
|
EN 10253-2 (Type B) |
European standard butt-welding fittings |
2.4856 (NiCr22Mo9Nb) |
|
EN 10253-4 |
European standard socket-welding fittings |
NiCr22Mo9Nb |
|
GB/T 12459 |
Chinese national standard seamless/welded fittings |
NS625 |
|
Element |
Ni |
Cr |
Fe |
Mo |
Nb+Ta |
C |
Mn |
P |
S |
Si |
Al |
Ti |
|
Alloy 625 |
≥58.0 |
20.0–23.0 |
≤5.0 |
8.0–10.0 |
3.15–4.15 |
≤0.10 |
≤0.5 |
≤0.015 |
≤0.015 |
≤0.5 |
≤0.4 |
≤0.4 |
The high molybdenum (8-10%) and niobium (3.15-4.15%) provide exceptional pitting resistance and solid solution strengthening.
|
Property |
Unit |
Alloy 625 (Annealed) |
|
Tensile Strength |
MPa |
≥825 |
|
Yield Strength (0.2% offset) |
MPa |
≥415 |
|
Elongation |
% |
≥30 |
|
Hardness (Brinell) |
HBW |
≤220 |
|
Density |
g/cm³ |
8.44 |
|
Melting Range |
°C |
1290–1350 |
Heat
Treatment Condition:
Alloy 625 fittings are solution annealed at 1095–1205°C followed by
water quenching. This treatment restores corrosion resistance and ductility.
|
Class |
Pressure Rating (psig) @ 100°F |
Pressure Rating (psig) @ 600°F |
Pressure Rating (psig) @ 800°F |
|
3000 LB |
2200 |
1950 |
1700 |
|
6000 LB |
4400 |
3900 |
3400 |
|
Fitting Type |
Main Forms |
Manufacturing Method |
|
Elbow |
45°, 90°, 180° (Long Radius LR / Short Radius SR) |
Seamless / Forged |
|
Tee |
Equal, Reducing |
Seamless / Forged |
|
Cross |
Equal |
Fabricated |
|
Reducer |
Concentric, Eccentric |
Seamless / Forged |
|
Cap |
Flat, Elliptical |
Forged |
|
Stub End (Lap Joint) |
Long type, Short type |
Seamless |
|
Nipple |
Threaded ends |
Machined |
|
Parameter |
Butt-Weld Fittings (BW) |
Socket-Weld / Threaded Fittings (SW / NPT) |
|
Nominal Size (DN/NPS) |
1/2″ – 24″ |
1/8″ – 4″ |
|
Wall Thickness Schedule |
Sch10S, Sch40S, Sch80S |
3000LB, 6000LB |
|
Manufacturing Process |
Seamless (≤12″) / Fabricated (>12″) |
Forging + Machining |
Raw Material Selection: Premium Alloy 625 billet VIM/VAR from Special Metals or VDM.
Cutting & Heating: Precise cutting and induction heating.
Forming: Hot forging or extrusion.
Solution Annealing: 1095–1205°C + water quench.
Machining & Beveling: Precision machining.
Pickling & Passivation: Special blended acids for nickel alloys.
Marking & Inspection: Laser marking with full traceability.
|
Surface Finish |
Description |
|
Annealed & Pickled (AP) |
Standard industrial finish. |
|
Mechanically Polished |
Smooth finish (180#–400# grit). |
|
Electropolished |
Ultra-clean for high-purity applications. |
|
Passivated |
Enhanced passive layer. |
Chemical Analysis: PMI for Ni, Cr, Mo, Nb.
Mechanical Testing: Tensile, yield, elongation, hardness.
NDT: 100% Penetrant Testing; UT/RT optional.
Corrosion Testing: ASTM G28 intergranular; ASTM G48 pitting optional.
Third-Party Inspection: SGS, BV, DNV, TUV available.
Subsea Umbilicals: Chemical injection, hydraulic control lines fittings.
Seawater Systems: High-velocity seawater pump discharge connections.
Thermal Oxidizers: High-temperature ductwork fittings.
Aerospace: Hydraulic lines, fuel manifold fittings.
Chemical Processing: High-pressure hydrochloric acid injection.
Small bore: Cartons with moisture-proof film.
Large bore: Wooden crates with foam padding, individual wrapping.
End Protection: Plastic caps or thread protectors.
Ready stock for 1/2″–12″ Sch10S/Sch40S.
1. How
does Alloy 625 differ from Alloy 825?
625 has higher Mo (8-10% vs 2.5-3.5%), higher PRE, and higher strength. Used in
more severe seawater and high-temperature oxidizing service.
2. Can
Alloy 625 fittings be welded to stainless steel?
Yes, use ERNiCrMo-3 filler; proper overlay or buttering recommended.
3. Is 625
resistant to hydrochloric acid?
Good for dilute HCl; concentrated HCl requires Hastelloy C276.
Premium Mill Sources: Special Metals, VDM.
Deep Experience: Subsea umbilical fittings, aerospace.
Full Traceability: Heat number to finished fitting.
Fast Custom Production: Engineered-to-order available.
Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568
E-mail: info@womicstainless.com
Website: www.womicsteel.com
Contact Womic Steel today for a competitive quote on Alloy 625 stainless steel pipe fittings. We offer certified quality, fast production lead times, and reliable global delivery to keep your pipeline projects running smoothly.
Stock Examples:
90° LR Elbow: 4″ Sch40S, 2″ Sch80S
Equal Tee: 2″×2″ Sch80S, 4″×4″ Sch40S
Concentric Reducer: 8″×6″ Sch40S, 6″×4″ Sch80S
Cap: 6″ Sch40S
Related
Keywords:
ASME B16.9 Inconel 625 butt weld fittings, UNS N06625 pipe elbows, alloy 625
equal tee for seawater, 625 reducing tee for subsea, Inconel 625 concentric
reducer, ASTM B366 WPN6 625 fittings, EN 10253-2 2.4856 buttweld fitting,
3000LB Alloy 625 socket weld elbow, Inconel 625 threaded nipple NPT, alloy 625
pipe cap high temperature, NACE MR0175 Inconel 625 fittings, subsea umbilical
alloy 625 fittings, high pressure alloy 625 connectors.
