Check ASTM B444 UNS N06625 CDS Pipe Dimension, Manufacturer of Alloy 625 Exhaust Pipe
"CDS" stands for Cold Drawn Bright Annealed Pipe
ASTM B444 is a standard specification for nickel-chromium-molybdenum-columbium alloys (UNS N06625 and UNS N06852) and nickel-chromium-molybdenum-silicon alloy (UNS N06219) pipe and tube. Grade 1 of ASTM B444 Alloy 625 pipe refers to a specific grade within this specification. The Alloy 625 Seamless Pipe is a high-strength, corrosion-resistant nickel-chromium-molybdenum alloy that is widely used in various applications in the aerospace, chemical processing, and oil and gas industries.
Astm B444 Alloy 625 Pipe Grade 1
ASTM B444 Inconel 625 pipe grade 1 is a corrosion and oxidation resistant nickel alloy that is used both for its high strength and outstanding aqueous corrosion resistance. Its outstanding strength and toughness is due to the addition of niobium which acts with the molybdenum to stiffen the alloy's matrix. Alloy 625 has excellent fatigue strength and stress-corrosion cracking resistance to chloride ions. This nickel alloy has excellent weldability and is frequently used to weld AL-6XN. This alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion.
Grade 1 of ASME SB 444 Alloy 625 pipe specifies the requirements for seamless pipes and tubes made from this alloy, particularly emphasizing their suitability for high-temperature and corrosive environments. These ALLOY 625 pipes are commonly used in industries such as aerospace, chemical processing, marine engineering, and nuclear power generation, where performance under extreme conditions is essential.
ASTM B444 Standard
ASTM 444 Inconel 625 / ASME SB444 Inconel 625 Seamless Tubes Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
Inconel 625 UNS N06625 products are furnished in two grades of different heat-treated conditions:
- Grade 1 (annealed)-Typically undergoes solution annealing at temperatures around 1,600°F (approximately 871°C). Material is normally employed in service temperatures up to 1100°F (593°C).
- Grade 2 (solution annealed)-Requires solution annealing at higher temperatures, approximately 2,000°F (about 1,093°C). Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.
NOTE 1: Hot-working or reannealing may change properties significantly, depending on working history and temperatures.
Certified Chemical Composition (Weight %)
| Element | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Columbium + Tantalum (Cb/Nb + Ta) | Iron (Fe) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
| Min % | 58.00 | 21.00 | 8.00 | 3.15 | - | - | - | - | - | - |
| Max % | Balance | 23.00 | 10.00 | 4.15 | 5.00 | 0.10 | 0.50 | 0.50 | 0.015 | 0.015 |
ASTM B444 Inconel 625 Seamless Tubes Mechanical Properties
| Temp° F | Tensile (psi) | .2% Yield (psi) | Elongation in 2 " (%) |
| 70 | 144,000 | 84,000 | 44 |
| 400 | 134,000 | 66,000 | 45 |
| 600 | 132,000 | 63,000 | 42.5 |
| 800 | 131,500 | 61,000 | 45 |
| 1000 | 130,000 | 60,500 | 48 |
| 1200 | 119,000 | 60,000 | 34 |
| 1400 | 78,000 | 58,500 | 59 |
| 1600 | 40,000 | 39,000 | 117 |
Sizing Capabilities & Pressure Bounds
Nominal Size Boundaries: 1/8" NPS up to 12" NPS (Outside Diameter from 10.3mm up to 323.8mm).
Wall Thickness Profiles: Full industrial schedule coverage including SCH 10S, SCH 40S, SCH 80S, SCH 160, SCH XS, and SCH XXS, along with specialized heavy-wall parameters.
Surface Delivery States: Solution Annealed & Pickled (acid-descaled matte finish) or Bright Annealed (BA protective gas-purged mirror sheen).
Length Dimensions: Single Random Lengths (SRL), Double Random Lengths (DRL), or precision cut-to-length parts down to millimeter precision.
Mandatory Non-Destructive Testing (NDT) Protocol
Every linear foot of ASTM B444 Alloy 625 Grade 1 pipe leaving the HT PIPE facility passes through zero-defect quality inspections before export packing:
Hydrostatic Pressure Testing: Each length is hydro-tested to ensure baseline pressure-containment integrity per ASTM B829 rules.
Ultrasonic (UT) & Eddy Current Testing: 100% full-body scanning to eliminate any risk of internal micro-fissures or subsurface wall flaws.
PMI Chemistry Checks: X-ray verification to confirm elemental concentrations match UNS N06625 limits exactly.
Complete B2B Package Integration for High-Stress Piping
Avoid the logistical headaches and traceability gaps of fragmented sourcing. HT PIPE designs, manufactures, and bundles complete industrial alloy packages with matching heat numbers and unified documentation. Along with ASTM B444 Grade 1 pipes, we supply matching:
ASTM B446 UNS N06625 Forged Bars: Centerless ground or smooth peeled profiles.
ASTM B443 Inconel 625 Plates & Sheets: Heavy-duty vessel grade cut-to-size options.
Forged Components & ASME B16.5 / B16.47 Flanges: Elbows, Equal/Reducing Tees, Concentric Reducers, Weldnecks, Blind Flanges, and Socket-Weld fittings.
Custom Pre-Fabricated Pipe Spools: Pre-welded, x-rayed, and non-destructively tested to seamlessly fit your isometric prints on-site.
