ASTM B619/B619M Welded Nickel and Nickel-Cobalt Alloy Pipe

 1. Scope  

- Applies to welded pipe made from nickel and nickel-cobalt alloys (e.g., UNS N06600, N06625, N08825) for corrosion-resistant or high-temperature service.  

- Includes both seamless and welded construction, with welded pipes further classified as fusion-welded or welded + cold-worked.  

 2. Ordering Information  

Buyers must specify:  

- ASTM Standard (B619-22) and alloy UNS number (e.g., N06625).  

- Dimensions (OD, wall thickness, length).  

- Condition (as-welded, annealed, cold-worked).  

- Finish (pickled, blasted, etc.).  

- Certification (if required).  

- Additional Testing (e.g., hydrostatic, NDE).  

 3. Material Codes (UNS Alloys)  

Common alloys covered:  

- N02200, N02201 (Nickel 200/201)  

- N06600 (Inconel 600)  

- N06625 (Inconel 625)  

- N08825 (Incoloy 825)  

- N10276 (Hastelloy C276)  

 4. Chemical Composition  

- Strict limits for nickel, chromium, cobalt, molybdenum, and other elements based on UNS alloy.  

- Trace elements (e.g., carbon, sulfur) are controlled.  

 5. Mechanical Properties  

- Tensile strength, yield strength, elongation requirements vary by alloy and condition.  

  - Example: N06625 annealed pipe must have ≥ 120 ksi (827 MPa) tensile strength.  

 6. Inspection & Testing Requirements  

- Chemical Analysis: Performed on heat samples.  

- Tension Tests: One per lot.  

- Hydrostatic Testing: Optional unless specified.  

- NDE (Non-Destructive Examination):  

  - Radiography or dye penetrant testing for welds (if required).  

- Visual Inspection: Surface defects must meet acceptance criteria.  

 7. Certification & Marking  

- Mill Test Reports must include chemical, mechanical, and test results.  

- Pipe Marking: Alloy UNS, ASTM standard, heat number, size, and manufacturer’s identification.  

 8. Keywords  

- Nickel alloy pipe, welded pipe, corrosion-resistant, high-temperature, UNS N06625.  

The ASTM B619-22 standard covers welded nickel and nickel-cobalt alloy pipes and includes the following UNS (Unified Numbering System) material codes for the alloys specified:  

 List of Material Codes (UNS Alloys) in ASTM B619-22  

| UNS Number | Common Alloy Name | Primary Composition |

| N02200  | Nickel 200           | 99.6% Ni (low carbon) |

| N02201  | Nickel 201           | 99.6% Ni (very low carbon) |

| N04400  | Monel 400            | Ni-Cu (66% Ni, 31.5% Cu) |

| N06600  | Inconel 600          | Ni-Cr-Fe (72% Ni, 15% Cr) |

| N06625  | Inconel 625          | Ni-Cr-Mo (61% Ni, 21.5% Cr, 9% Mo) |

| N08800  | Incoloy 800          | Ni-Fe-Cr (32.5% Ni, 21% Cr) |

| N08810  | Incoloy 800H         | High-carbon 800 variant |

| N08811  | Incoloy 800HT        | Stabilized 800H variant |

| N08825  | Incoloy 825          | Ni-Fe-Cr-Mo (42% Ni, 21.5% Cr, 3% Mo) |

| N10276  | Hastelloy C276       | Ni-Mo-Cr (57% Ni, 16% Cr, 16% Mo) |

| N06022  | Hastelloy C22        | Ni-Cr-Mo-W (56% Ni, 22% Cr, 13% Mo) |

| N06059  | Hastelloy C59        | Ni-Cr-Mo (59% Ni, 23% Cr, 16% Mo) |

| N06455  | Hastelloy C-4        | Ni-Mo-Cr (65% Ni, 16% Mo) |

| N06985  | Hastelloy G-3        | Ni-Cr-Fe-Mo-Cu (44% Ni, 22% Cr) |

| N06007  | Hastelloy G-30       | Ni-Cr-Fe-Mo (43% Ni, 30% Cr, 5% Mo) |

| N06200  | Hastelloy C-2000     | Ni-Cr-Mo-Cu (59% Ni, 23% Cr, 16% Mo) |

| N06686  | Inconel 686          | Ni-Cr-Mo-W (58% Ni, 21% Cr, 16% Mo) |

| N10665  | Hastelloy B-2        | Ni-Mo (65% Ni, 28% Mo) |

| N10675  | Hastelloy B-3        | Ni-Mo (65% Ni, 28.5% Mo) |

 Notes:  

1. Welded Pipe Types: These alloys can be supplied in as-welded, annealed, or cold-worked conditions.  

2. Overlap with Other Standards: Some alloys (e.g., N06625, N10276) are also covered in ASTM B622 (seamless pipe) and ASTM B829 (general requirements).  

3. Corrosion & High-Temp Use: Alloys like C276 (N10276) and 625 (N06625) are common in aggressive environments.  

For exact chemical composition limits and mechanical properties, refer to ASTM B619-22, Table 1 (Chemical) & Table 2 (Mechanical).  

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