ASME SB444 UNS N06625 Nickel Alloy Steel Seamless Tube
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What is the ASTM B444 standard?
ASTM B444 is the standard specification for nickel-chromium-molybdenum-niobium alloy (UNS N06625 and UNS N06852) and nickel-chromium-molybdenum-silicon alloy (UNS N06219) tubing. The products are cold-worked seamless tubing. UNS N06625 is available in both annealed Grade 1 and solution-annealed Grade 2 finishes, while UNS N06219 and UNS N06852 are only available in the solution-annealed finish.
GNEE manufactures cold-worked seamless pipes that meet ASTM B444 UNS N06625 standards, offering a wide range of sizes. UNS N06625 Inconel 625 is a non-magnetic nickel-based alloy containing a minimum of 58% nickel and at least 8% molybdenum. Its European equivalent is EN WNr 2.4856. This alloy provides exceptional corrosion resistance and maintains outstanding performance even under extreme conditions, from very low temperatures up to 1100°C.
Our stock of Inconel 625 seamless pipes is available in two grades (Grade 1 and Grade 2). ASTM B444 UNS N06625 Grade 1 pipes are supplied in the annealed condition, while Grade 2 pipes are provided in the solution-annealed condition. The outer diameter and nominal (or minimum) wall thickness of UNS N06625 pipes cover a broad range, with all dimensions conforming to standard pipe sizes and wall thickness schedules.
What is the difference between ASME SB444 Grade 1 and Grade 2?
Grade 1 (Annealed): Typically annealed at 1600°F (871°C) minimum. It offers higher tensile and yield strength. It is commonly used for service temperatures up to 1100°F (593°C).
Grade 2 (Solution Annealed): Solution annealed at 2000°F (1093°C) minimum. It is designed for service above 1100°F where resistance to creep and rupture is required.
What is the maximum service temperature for SB444 N06625 tubes?
It can be used from cryogenic temperatures up to 1800°F (982°C). However, for load-bearing applications at high temperatures, Grade 2 (Solution Annealed) must be specified to prevent creep.
ASME SB444 UNS N06625 Tube Specification:
| Specifications | ASTM B444 & Its equivalent ASME, DIN & EN Standard. |
| Grades | UNS N06625/DIN 2.4856/INCONEL 625 |
| Type | U-bend & Straight seamless tube |
| Outside Diameter | 1/4'' to 1'' or custom size |
| Wall Thickness | BWG25;BWG22;BWG20;BWG18;BWG16;BWG14;BWG12;BWG10 |
| Length | custom cut lengths |
| Delivery Condition | Solution Annealed & Pickled |
| Ends | Plain End, Beveled End |
| Other Testing | Product Analysis, Eddy Current Test, Hydrostatic Test, Ultrasonic Test, Flattening Test, Hardness Test, Tensile Test etc. |
| Dimension | All Pipes & Tube Is Manufactured and Inspected / Tested to the Relevant standards including ASTM and ASME |
| Packing | Plywood case |
ASME SB444 UNS N06625 Nickel Alloy Steel Tube Chemical Composition:
| Element | Limit | Element | Limit |
|---|---|---|---|
| Nickel (Ni) | 58.0 min | Cobalt (Co) | 1.0 max |
| Chromium (Cr) | 20.0–23.0 | Molybdenum (Mo) | 8.0–10.0 |
| Niobium + Tantalum | 3.15–4.15 | Iron (Fe) | 5.0 max |
| Carbon (C) | 0.10 max | Aluminum (Al) | 0.40 max |
| Manganese (Mn) | 0.50 max | Titanium (Ti) | 0.40 max |
| Silicon (Si) | 0.50 max | Phosphorus (P) / Sulfur (S) | 0.015 / 0.015 max |
ASME SB444 UNS N06625 Seamless Tube Mechanical Properties:
| Grade | Condition | Tensile (min) | Yield (min) | Elongation in 2 in (min) |
|---|---|---|---|---|
| Grade 1 | Annealed | 120 ksi (827 MPa) | 60 ksi (414 MPa) | 30% |
| Grade 2 | Solution annealed | 100 ksi (690 MPa) | 40 ksi (276 MPa) | 30% |
ASME SB 444 Tube Heat Treatment
Grade 1 (annealed): for the highest room- and low-temperature strength and fatigue resistance.
Grade 2 (solution annealed): heat treated at a higher temperature for creep resistance in elevated-temperature service.
Spring temper treatment: where specified, a low-temperature treatment at about 260–370 °C (500–700 °F) is used for spring-temper tubing.
ASTM B444 UNS N06625 Pipe Tolerances
| Outside Diameter (mm) | OD Tolerance (mm) | ID Tolerance (mm) | Wall Tolerance |
|---|---|---|---|
| OD < 2.4 | +0.05 / -0 | +0 / -0.05 | ±10% |
| 2.4 ≤ OD < 4.8 | +0.08 / -0 | +0 / -0.08 | ±10% |
| 4.8 ≤ OD < 12.7 | +0.10 / -0 | +0 / -0.10 | ±10% |
| 12.7 < OD ≤ 31.8 | +0.13 / -0 | +0 / -0.13 | ±10% |
ASTM B444 UNS N06625 Tube Price List
| Price List | Price in USD |
|---|---|
| ASTM B444 UNS N06625 Tube Size: 6.35 * 204 * 0.25 | US $ 0.10 |
| SB 444 N06625 Tube Size: 12 * 0.75 | US $ 70.00 |
If you need more help, tell me:
What outer diameter (OD) and wall thickness do you need?
What industry or environment is this for?
I can help you find size availability or technical limits.
Why is N06625 significantly more expensive than Stainless Steel 316L?
The price is driven by the high Nickel (approx. 60%) and Molybdenum (9%) content. These elements are much more expensive than the iron and chromium used in stainless steel. However, the lifespan in corrosive environments often makes it more cost-effective over time.
Quality Inspection
GNEE performs strict inspection for ASME SB444 UNS N06625 Nickel Alloy Seamless Tubes in accordance with SB444/ASTM B444 requirements. Each tube can undergo chemical composition verification, tensile testing, dimensional inspection, visual examination, and hydrostatic or nondestructive electric testing. ASTM B444 requires each pipe or tube to receive hydrostatic or nondestructive electric examination, while tensile properties are verified according to the supplied heat-treatment condition. Inspection results are documented in an EN 10204 3.1 MTC for batch traceability.
If you have project requirements for ASTM B444 N06625 Pipes, please feel free to place an order. GNEE has a large inventory of popular products for your selection. They can be processed into both seamless and welded forms. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com
Packaged with waterproof paper and steel strapping, meeting standard export sea freight packaging requirements, suitable for various shipping methods, or customized according to customer requirements.
