Alloys for Oil & Gas and Sour Service
Select alloys for oil and gas, sour service and API projects. Compare Inconel 625, Incoloy 825, Duplex 2507, 2205, 17-4PH, API 6A, 6D, 5CT, 5L, 17D, NACE MR0175 and RFQ details.
Send RFQFor sour service, material choice depends on H2S, CO2, chloride level, pH, temperature, pressure, stress, hardness limits, product form, API equipment specification and NACE MR0175 / ISO 15156 or project-specific requirements.
Recommended Alloys
| Alloy | Common Service | Why It Is Considered | Product Page |
|---|---|---|---|
| Inconel 625 | Offshore, sour service and chloride corrosion | High nickel alloy corrosion resistance and strength | View product |
| Incoloy 825 | Selected sour and acid oilfield environments | Nickel-iron-chromium alloy with molybdenum and copper | View product |
| Duplex 2507 | High-strength chloride oil and gas systems | Super duplex stainless steel with high strength and chloride resistance | View product |
| Duplex 2205 | Moderate chloride and process piping | Cost-effective duplex stainless steel for less severe service | View product |
| 17-4PH | Shafts, valves and high-strength machined parts | PH stainless steel where service conditions and hardness limits allow | View product |
Selection Guide
| If Your Project Needs | Start With | RFQ Notes |
|---|---|---|
| Severe chloride and sour environment | Start with Inconel 625 or Duplex 2507 | Confirm H2S, CO2, chloride, pH, temperature, NACE MR0175 / ISO 15156 and any API 6A, API 6D or API 17D project requirement. |
| Moderate oilfield process piping | Compare Duplex 2205 and Duplex 2507 | Choose based on chloride level, strength and corrosion risk. If the project references API 5L, also provide the line-pipe or base-pipe specification and the separate CRA, clad, overlay or component material requirement. |
| Acidic or chemical injection service | Review Incoloy 825 and Inconel 625 | Provide fluid chemistry, pressure and temperature. |
| High-strength valve or shaft component | Consider 17-4PH only if corrosion severity allows | Confirm hardness, heat treatment and project approval. |
API, NACE and Project Standard Selection
| Referenced Standard | Where It Commonly Appears | Material / RFQ Notes |
|---|---|---|
| API 6A | Wellhead and Christmas tree equipment, valve bodies, stems, bolting and pressure-control components | Commonly paired with NACE MR0175 / ISO 15156 for sour service. Confirm PSL, material class, hardness and inspection requirements. |
| API 6D | Pipeline valves, ball valves, gate valves, trims, shafts and corrosion-resistant components | Confirm valve component drawing, alloy grade, pressure class, corrosion medium and MTC/PMI requirements. |
| API 5CT | Casing, tubing and downhole-related material requirements | For nickel alloy or CRA-related items, provide grade, size, condition, sour service requirement and any customer specification. |
| API 5L | Seamless and welded steel line pipe; it is not by itself a nickel-alloy or duplex product standard | If API 5L is referenced, provide the line-pipe or base-pipe specification plus the separate CRA, clad, overlay, fitting, flange or component material specification. |
| API 17D | Subsea wellhead and tree equipment, subsea valve and high-pressure components | Often requires strict traceability, sour service checks, mechanical properties and third-party inspection. |
| NACE MR0175 / ISO 15156 | Materials exposed to H2S-containing oil and gas production environments | Confirm H2S, CO2, chloride, pH, temperature, pressure, hardness limits, heat treatment and product form. |
| NORSOK M-630 / project MDS | North Sea, offshore and project-specific material datasheet requirements | Send the MDS or project specification with the RFQ to check chemistry, mechanical testing, corrosion testing and certification scope. |
Common Product Forms
| Product Form | Typical Materials | Related Landing Page |
|---|---|---|
| Pipe / Tube | Inconel 625, Incoloy 825, Duplex 2507 | Duplex 2507 pipe supplier |
| Bar / Shaft | 17-4PH, Monel K500, Inconel 718 | 17-4PH bar supplier |
| Plate / Fittings | Duplex 2507, Inconel 625, Hastelloy C-276 | Hastelloy C-276 plate supplier |
Standards and Inspection Notes
Standards
Confirm ASTM, ASME, API, NACE MR0175 / ISO 15156, NORSOK M-630, EN or project-specific standards before quotation. Material availability and inspection scope depend on the requested product form and condition.
Service Conditions
Include medium, concentration, chloride level, pH, temperature, pressure, flow condition and whether crevice corrosion, welding or stress is expected.
Inspection
Available quotation options may include EN 10204 3.1 MTC, PMI, dimensional inspection, mechanical tests, UT or third-party inspection depending on product form.
Application FAQ
What alloys are used in oil and gas sour service?
Inconel 625, Incoloy 825, Duplex 2507, Duplex 2205 and selected stainless steels may be used depending on H2S, CO2, chloride, pH, temperature, stress, NACE MR0175 / ISO 15156 and project requirements.
Is Duplex 2507 suitable for oil and gas?
Duplex 2507 is often selected for oil and gas systems needing high strength and strong chloride corrosion resistance, but sour service use must be checked against NACE and project-specific limits.
What information is needed for an oil and gas alloy RFQ?
Send grade, product form, size, API or project standard, quantity, H2S, CO2, chloride, pH, temperature, pressure, hardness requirement, inspection requirement and destination country.
Can J&A Alloy quote materials for API 6A or API 6D projects?
Yes. Send the API reference, project MDS, alloy grade, product form, size, pressure class or drawing, NACE requirement and inspection scope. We can check practical material availability and quotation options.
Which standards matter most for sour service materials?
NACE MR0175 / ISO 15156 is the key sour-service material reference. API 6A, API 6D, API 5CT or API 17D may define equipment requirements. API 5L applies to steel line pipe, so CRA, clad, overlay and associated nickel-alloy or duplex items need separate material and project specifications.
Related Material Links
Request an Application-Based Alloy Quote
Send us the service medium, H2S, CO2, chloride level, pH, temperature, pressure, alloy grade if known, product form, size, quantity, material condition, API/NACE/project standard, inspection requirement and destination country.
- Material need: application, medium, sour service condition and target alloy family
- Product form: pipe, tube, plate, sheet, bar, wire, flange, fitting or forging
- Standards: applicable API equipment specification; API 5L line-pipe/base-pipe specification where relevant; separate CRA, clad or overlay material specification; NACE MR0175 / ISO 15156, NORSOK M-630 or project MDS
- Inspection: MTC, PMI, UT, mechanical tests, hardness, corrosion testing or third-party inspection
- Delivery: destination country, quantity and required lead time