ASTM B444 (ASME SB-444) is the standard specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube. The alloy 625 tubes, which are widely used for superheater or heat exchanger tubing, are generally manufactured as per ASTM B444 (ASME SB-444) UNS N06625. It is a typical nickel-chromium-molybdenum-columbium alloy, which is commercially known as a proprietary brand of "Inconel® alloy 625" . ZYTC Alloy is an ISO 9001 and AS 9120B certified superalloy manufacturer and supplier, offering ASTM B444 UNS N06625 pipe and tube at factory-direct prices with full material traceability and fast global delivery. We offer custom grades, sizes, and non-standard materials. Contact us with your requirements.
Product Forms & Availability – UNS N06625 (Alloy 625)| Product Form | Grade | Size Range |
|---|
| Seamless Pipe | Grade 1 / Grade 2 | Custom | | Seamless Tube | Grade 1 / Grade 2 | Small diameter / light wall | | Cold-Drawn Tube | Grade 1 / Grade 2 | Ground bright or pickled matte |
For all stock availability, contact Sales.
Specifications – UNS N06625 Pipe and Tube| Specification | Description |
|---|
| ASTM B444 | Standard specification for pipe and tube | | ASME SB-444 | Boiler code version | | ASTM B829 | General requirements for pipe and tube | | UNS N06625 | Unified numbering system | | Inconel® 625 | Trade name |
Operating Conditions & Selection CriteriaService Temperature Range: Grade 1 up to 593°C (1100°F); Grade 2 for temperatures above 593°C (1100°F) where creep and rupture resistance are required Strengthening Mechanism: Solid solution strengthened by molybdenum and niobium — no precipitation hardening required Corrosion Resistance: Excellent resistance to seawater, acids, alkalis, pitting, and crevice corrosion Oxidation Resistance: Good resistance to oxidation up to 982°C (1800°F) Weldability: Excellent weldability; no post-weld heat treatment required Fabricability: Good cold formability; available with ground bright or pickled matte surfaces Small Diameter / Light Wall: Special sizes available for heat exchanger and instrumentation tubing
ApplicationsHeat Exchangers: Superheater tubing, heat exchanger tubes, condenser tubes Instrumentation: Small-diameter, light-wall tubing for control and instrumentation lines Chemical Processing: Piping for corrosive media, reactor components Marine: Seawater piping systems, offshore platform equipment Oil & Gas: Downhole tubing, sour gas service, wellhead components Aerospace: Hydraulic lines, fuel lines, exhaust systems
Factory Price – ASTM B444 UNS N06625 Pipe and Tube (Inconel 625)Indicative factory pricing (FOB China): | Product Form | Grade | OD Range | Wall Range | Price (USD/kg) |
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| Seamless Tube | Grade 1 | 3mm – 31.8mm | 0.38mm – 3.0mm | $30 – $60 | | Seamless Tube | Grade 2 | 3mm – 31.8mm | 0.38mm – 3.0mm | $35 – $65 | | Seamless Pipe | Grade 1 | 1/2″ – 8″ NB | SCH 10S – 80S | $28 – $55 | | Seamless Pipe | Grade 2 | 1/2″ – 8″ NB | SCH 10S – 80S | $32 – $60 | | Cold-Drawn Tube | Grade 1/2 | Small diameter | Light wall | $40 – $80 | | Ground Bright Tube | Grade 1/2 | Small diameter | Light wall | $45 – $90 | | Pickled Matte Tube | Grade 1/2 | Small diameter | Light wall | $35 – $70 |
Volume discounts available for orders above 100 kg. Custom sizes, tolerances, and specifications available – contact us for a firm quote.
Delivery Lead Times (after pre-payment confirmation)| Stock Status | Delivery Time |
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| Products in stock | Within 3 days | | Raw material in stock | Within 10 days | | Re-melting required | 15 – 25 days |
Contact ZYTC Alloy TodayRequest a quote for ASTM B444 UNS N06625 Pipe and Tube (Inconel 625) – Nickel-Chromium-Molybdenum-Columbium Alloy – Grade 1 / Grade 2 . Please provide: Product form (pipe / tube) Grade (Grade 1 / Grade 2) Outside diameter (OD) and wall thickness Length required Surface finish (ground bright / pickled matte) Quantity (kg, meters, or pieces) Destination port Any special certification requirements
📧 Email: daisy@zytcsteel.com
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