ASTM B425 Alloy 825 Round Bar for Chemical and Offshore Parts

Product Specification

ASTM B425 Alloy 825 Round Bar for Chemical and Offshore Parts

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm b425 alloy 825 round bar for chemical and offshore parts for buyers whose primary search intent is machined components for sulfuric/phosphoric acid and oil-and-gas service, not generic stainless or nickel-alloy stock. The page should be quoted against the selected standard edition, the equipment or component drawing and the governing design code. Nickel-iron-chromium Alloy 825 round bar to ASTM B425 for machined chemical-process, oil-and-gas and offshore components.

The material decision should start with service conditions. Ni-Fe-Cr alloy with molybdenum, copper and titanium, combining acid resistance with useful localized-corrosion resistance. Compare with Alloy 625 for higher strength and broader chloride resistance; compare with C276/C22 for more severe mixed acid service. This comparison belongs in the enquiry stage because a higher alloy name does not automatically deliver the lowest life-cycle risk.

A complete RFQ needs product form, grade/UNS, ordered condition, dimensional basis, tolerances, quantity and inspection level. State diameter, tolerance, length, straightness, surface, machining allowance and any NDE requirement. For pressure-containing products, the material standard controls product quality; it does not replace pressure-design calculations, corrosion allowance or code approval.

Manufacturing and documentation must remain connected. Hot or cold working, required heat treatment, straightening and surface finishing with heat traceability. The baseline verification plan is: MTC, chemistry/mechanical tests, PMI, dimensions/straightness and optional UT/PT. Any supplementary requirement—PMI extent, UT class, eddy-current acceptance, corrosion testing, grain size, roughness, cleanliness or third-party inspection—must appear in the PO before production.

Fabrication guidance: Machine with rigid tooling and positive feeds. Select filler metal and any post-weld cleaning based on the joint and process environment. Selection boundary: Alloy 825 is not a default seawater alloy for every temperature and crevice condition. Evaluate pitting, crevice corrosion and sour-service qualification separately. Buyers should provide fluid composition, maximum and minimum temperature, pressure, design life, fabrication route and applicable code so the quotation can separate mandatory requirements from optional controls.

Standards, Dimensions and Supply Definition

Material and Selection Markers

Use note: Values above are concise identification/selection markers, not a replacement for the ordered ASTM/AWS chemistry table or the MTC.

Candidate Applications

· Acid-service valve parts.

· Pump shafts.

· Oil-and-gas components.

· Phosphoric-acid process hardware.

Buyer Decision Boundary

Compare with Alloy 625 for higher strength and broader chloride resistance; compare with C276/C22 for more severe mixed acid service.

Processing, Inspection and Documentation

· Manufacturing: Hot or cold working, required heat treatment, straightening and surface finishing with heat traceability.

· Fabrication: Machine with rigid tooling and positive feeds. Select filler metal and any post-weld cleaning based on the joint and process environment.

· Inspection: MTC, chemistry/mechanical tests, PMI, dimensions/straightness and optional UT/PT.

· Traceability: Keep heat/lot identity through cutting, machining, bending, welding, testing and packing.

· Documentation: Confirm MTC type, test reports, packing list, country-of-origin statement and third-party inspection before production.

RFQ Checklist

· Standard and adopted edition: ASTM B425

· Grade / UNS: Alloy 825 / N08825

· Form and route: Rod and round bar

· Dimensions, tolerances, quantity and unit basis

· Delivery/heat-treatment condition and surface/end finish

· Design code, service fluid/atmosphere, pressure and temperature

· Inspection/NDE, acceptance criteria, MTC and third-party witness points

· Marking, preservation, packing and delivery destination

Inquiry CTA

Frequently Asked Questions

1. What does ASTM B425 cover for this product? Nickel-iron-chromium Alloy 825 round bar to ASTM B425 for machined chemical-process, oil-and-gas and offshore components. Always purchase to the edition adopted by the contract or project specification.

2. Is this product seamless, welded, forged, rolled or drawn? The PO must state the required route exactly: Rod and round bar. Do not rely on a product photograph or a family name to establish the route.

3. How should buyers select Alloy 825? Ni-Fe-Cr alloy with molybdenum, copper and titanium, combining acid resistance with useful localized-corrosion resistance. Compare with Alloy 625 for higher strength and broader chloride resistance; compare with C276/C22 for more severe mixed acid service.

4. Which dimensions must be included in the RFQ? State diameter, tolerance, length, straightness, surface, machining allowance and any NDE requirement. Add quantity, unit basis, tolerances and any drawing-controlled geometry.

5. What heat-treatment or delivery condition is required? Hot-finished or cold-drawn and annealed/stabilized as required by the ordered specification. The MTC and heat-treatment records should use the same grade and condition language as the PO.

6. Which inspection documents can be requested? MTC, chemistry/mechanical tests, PMI, dimensions/straightness and optional UT/PT. The final inspection scope must be agreed before order placement.

7. Is it suitable for the intended corrosive or high-temperature service? Alloy 825 is not a default seawater alloy for every temperature and crevice condition. Evaluate pitting, crevice corrosion and sour-service qualification separately. A material engineer should approve the final choice using actual service data.

8. What fabrication issues should be addressed? Machine with rigid tooling and positive feeds. Select filler metal and any post-weld cleaning based on the joint and process environment. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.

9. What are typical applications? Common candidate applications include acid-service valve parts, pump shafts, oil-and-gas components, phosphoric-acid process hardware. These examples are not blanket design approvals.

What information is needed for a firm quotation? Send standard and edition, grade/UNS, form, dimensions, condition, quantity, delivery destination, inspection/NDE, documentation, packing and any third-party inspection or code requirement.