Material selection
Incoloy Flanges
Incoloy flange enquiries cover defined nickel-iron-chromium alloys. Identify the grade and required condition rather than substituting a similarly named Inconel alloy.
Distinguish the designation
Alloy 800, 800H, 800HT and 825 illustrate the different specifications found within this family. Composition controls and material condition can affect the intended service. The flange enquiry should reproduce the exact project designation and the applicable product specification.
Match the service requirement
Some enquiries are driven by high-temperature mechanical performance, while others are driven by corrosion in a process fluid. Neither requirement follows from the family name alone. Include the complete design-temperature range, chemistry and relevant loading or life considerations.
Fabrication compatibility
Confirm heat-treatment and welding requirements for the selected grade and the mating pipe. Dissimilar welds require their own review. Flange dimensions, facing and bolting still need to be specified under the applicable joint design, independently of the material choice.
Selection reference only. Offered scope, technical compliance and availability are confirmed against the complete project enquiry.
Material designations and distinctions
Reference designations for Incoloy Flanges. These are not an availability list or an equivalence table. A trade name, UNS number and ASTM product specification have different roles.
| Parameter / designation | Technical information | Selection requirement |
|---|---|---|
| 800 / UNS N08800 | Nickel-iron-chromium alloy | Confirm the product specification, grade/condition, design suitability and required material records. |
| 800H / 800HT | Separate controlled-composition and material-condition requirements | Confirm the product specification, grade/condition, design suitability and required material records. |
| 825 / UNS N08825 | Nickel-iron-chromium alloy with molybdenum and copper | Confirm the product specification, grade/condition, design suitability and required material records. |
Compare related options
Compare Incoloy Flanges with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| Inconel Flanges | Specify Inconel flanges by alloy number and product specification. The nickel-chromium alloy family spans different corrosion, temperature and strength requirements. | Alloy number or UNS and product specification |
| Alloy / Chrome Moly Steel Flanges | Chrome-moly flange enquiries require the exact alloy grade and heat-treatment condition, especially where elevated temperature and welding govern the design. | Complete specification and chrome-moly grade |
| Alloy 20 Flanges | Alloy 20 flange enquiries should identify UNS N08020 and the applicable product specification, with corrosion suitability reviewed for the actual process. | UNS N08020, product specification and condition |
Inspection, documents and delivery
Define acceptance requirements for Incoloy Flanges in the purchase order. Required examinations and documents depend on the material, design and project specification.
| Review stage | Information to confirm | Order requirement |
|---|---|---|
| Material identity and traceability | Specification, grade, heat/lot identification and the required material certificate. | Agree documentation and marking before manufacture; visual appearance cannot verify alloy identity. |
| Dimensional verification | The selected flange form, bore, thickness, bolt pattern and mating geometry. | Identify inspection points, tolerances, units and drawing revision. |
| Surface and end condition | Gasket-contact surface, attachment end, edges and any coating exclusions. | State finish and visual acceptance criteria; agree protection of machined surfaces. |
| Supplementary examinations | Any specified PMI, NDE, hardness, impact, corrosion or other tests. | Define the method, sampling and acceptance criteria; tests are not automatically included. |
| Assembly compatibility | Adjoining components, weld or mechanical interface and project service conditions. | Design approval and correct assembly remain separate from a dimensional inspection report. |
| Packing and order release | Quantity, identification, surface protection, documents and delivery destination. | Agree preservation, packaging and release requirements with the order. |
Enquiry checklist
Details for Incoloy
Specify the complete joint and design conditions. This checklist is not a dimensional table or an engineering approval.
| Item | Requirement |
|---|---|
| Designation | Full alloy variant and product specification |
| Service basis | Corrosion environment or elevated-temperature design requirements |
| Condition | Heat treatment and any project-specific material controls |
| Connection | Weld preparation, facing and dimensional standard |
Continue the specification