Stainless Steel
Specify stainless steel flanges by grade, product specification and service conditions, not by a bright surface finish or the general name stainless steel.
Material enquiry guide
Flange Materials
Material selection starts with the service environment, design conditions and exact grade designation.
These references help define an enquiry; they are not a declaration of stock, certification or suitability for a particular service.
Browse flange typesView guide
Carbon Steel
Define carbon steel flanges by product specification, temperature range and joint design. Carbon steel is a material family, not a pressure rating.
Alloy / Chrome Moly Steel
Chrome-moly flange enquiries require the exact alloy grade and heat-treatment condition, especially where elevated temperature and welding govern the design.
Duplex Steel
Duplex flange selection combines corrosion resistance with a controlled two-phase microstructure. Identify the exact grade rather than requesting duplex alone.
Super Duplex Steel
Super duplex flange enquiries need a grade-specific corrosion and fabrication review. The family name is not a guarantee of suitability for seawater or chemical service.
Nickel
Commercially pure nickel flanges are a different enquiry from nickel-alloy flanges. Specify the grade and service chemistry without relying on the word nickel alone.
Monel
Monel nickel-copper flange enquiries should identify the alloy designation and condition. Alloy 400 and K-500 have different composition and strengthening requirements.
Inconel
Specify Inconel flanges by alloy number and product specification. The nickel-chromium alloy family spans different corrosion, temperature and strength requirements.
Incoloy
Incoloy flange enquiries cover defined nickel-iron-chromium alloys. Identify the grade and required condition rather than substituting a similarly named Inconel alloy.
Hastelloy
Hastelloy flanges require an exact alloy designation and process-chemistry review. A family name is not a specification for all corrosive fluids.
Alloy 20
Alloy 20 flange enquiries should identify UNS N08020 and the applicable product specification, with corrosion suitability reviewed for the actual process.
SMO 254
SMO 254 is a high-alloy austenitic stainless material, not a duplex grade. Define the flange using the required alloy designation and product specification.
From specification to enquiry
A connection starts with the right details.
Send your material, size, rating, facing and quantity. Include a drawing reference for non-standard requirements.
Dimensions and connection data
Define Flange Materials as part of the complete joint. These fields identify required engineering data; they are not universal dimensions or a declaration of available sizes.
| Parameter / designation | Technical information | Selection requirement |
|---|---|---|
| Nominal size and bore | State the nominal connection size separately from the actual bore or pipe outside diameter. | A matching size label does not establish matching internal geometry. |
| Outside diameter and thickness | Identify the finished flange diameter, minimum thickness and any hub or collar projection. | Include the drawing datum and units for replacement measurements. |
| Bolt circle and holes | Record pitch-circle diameter, hole quantity, hole diameter and any special orientation. | Check against the mating flange; do not infer a bolt pattern from pressure class alone. |
| Gasket-contact surfaces | Specify face form, seating dimensions and surface finish on the assembled joint. | Include gasket designation; a visually similar surface is not evidence of compatibility. |
| Pipe-side interface | Identify weld preparation, socket, thread, collar or other attachment geometry as applicable. | Provide pipe schedule/wall thickness and the connection-specific standard. |
| Design conditions | State design pressure, minimum/maximum temperature, fluid and mechanical loads. | Pressure class is not a pressure value in bar or psi. Use the material-specific rating basis. |
Compare related options
Compare Flange Materials with the related forms or references below. A related product is not necessarily a permissible substitute.
| Related product / reference | Distinction | Check before selection |
|---|---|---|
| Stainless Steel Flanges | Specify stainless steel flanges by grade, product specification and service conditions, not by a bright surface finish or the general name stainless steel. | Material specification, grade and any low-carbon or stabilised variant |
| Carbon Steel Flanges | Define carbon steel flanges by product specification, temperature range and joint design. Carbon steel is a material family, not a pressure rating. | Forging or plate specification, grade and heat treatment |
| 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 |
| Duplex Steel Flanges | Duplex flange selection combines corrosion resistance with a controlled two-phase microstructure. Identify the exact grade rather than requesting duplex alone. | UNS designation and applicable product specification |
| Super Duplex Steel Flanges | Super duplex flange enquiries need a grade-specific corrosion and fabrication review. The family name is not a guarantee of suitability for seawater or chemical service. | Exact UNS and material specification |
| Nickel Flanges | Commercially pure nickel flanges are a different enquiry from nickel-alloy flanges. Specify the grade and service chemistry without relying on the word nickel alone. | Nickel grade and product specification |
Inspection, documents and delivery
Define acceptance requirements for Flange Materials 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 | Critical dimensions from the selected standard or controlled drawing. | 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. |