ASTM B705 Alloy 625 Welded Pipe, Longitudinal Seam | UNS N06625

Product Specification

ASTM B705 Alloy 625 Welded Pipe, Longitudinal Seam | UNS N06625

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm b705 alloy 625 welded pipe, longitudinal seam | uns n06625 for buyers whose primary search intent is large-bore chemical and offshore welded piping, 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. Longitudinally welded Alloy 625 pipe to ASTM B705, annealed and inspected for corrosive chemical, offshore and pollution-control piping.

The material decision should start with service conditions. Ni-Cr-Mo-Nb alloy offering high strength and broad corrosion resistance, with procurement focus on seam route, cold work, annealing and NDE. Use B622 seamless product when a seam is prohibited; use B705 welded pipe when large-bore availability and a qualified longitudinal weld route meet the project. 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. Specify NPS, schedule or nominal wall, length, ends, ovality, weld reinforcement, dimensional standard and governing design code. 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. Automatic welding without filler metal, followed by required cold work/annealing, sizing and full seam inspection. Spiral construction is not acceptable for this page. The baseline verification plan is: MTC, weld procedure/route record, hydrostatic or NDE, seam UT/RT/ET as ordered, PMI, dimensions and optional corrosion testing. 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: Field girth welds require a separate qualified WPS/PQR. Control iron contamination, arc strikes, root oxidation and interpass temperature. Selection boundary: Product-standard compliance does not establish ASME pressure rating or corrosion suitability. Verify schedule, design code, weld joint factor and environment. 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

· Offshore process piping.

· Scrubber duct and piping.

· Chemical transfer lines.

· Seawater systems after design review.

Buyer Decision Boundary

Use B622 seamless product when a seam is prohibited; use B705 welded pipe when large-bore availability and a qualified longitudinal weld route meet the project.

Processing, Inspection and Documentation

· Manufacturing: Automatic welding without filler metal, followed by required cold work/annealing, sizing and full seam inspection. Spiral construction is not acceptable for this page.

· Fabrication: Field girth welds require a separate qualified WPS/PQR. Control iron contamination, arc strikes, root oxidation and interpass temperature.

· Inspection: MTC, weld procedure/route record, hydrostatic or NDE, seam UT/RT/ET as ordered, PMI, dimensions and optional corrosion testing.

· 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 B705

· Grade / UNS: Alloy 625 / N06625

· Form and route: Longitudinally welded pipe

· 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 B705 cover for this product? Longitudinally welded Alloy 625 pipe to ASTM B705, annealed and inspected for corrosive chemical, offshore and pollution-control piping. 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: Longitudinally welded pipe. Do not rely on a product photograph or a family name to establish the route.

3. How should buyers select Alloy 625? Ni-Cr-Mo-Nb alloy offering high strength and broad corrosion resistance, with procurement focus on seam route, cold work, annealing and NDE. Use B622 seamless product when a seam is prohibited; use B705 welded pipe when large-bore availability and a qualified longitudinal weld route meet the project.

4. Which dimensions must be included in the RFQ? Specify NPS, schedule or nominal wall, length, ends, ovality, weld reinforcement, dimensional standard and governing design code. Add quantity, unit basis, tolerances and any drawing-controlled geometry.

5. What heat-treatment or delivery condition is required? Annealed as required by the ordered specification; selected Grade/condition must match service temperature and design data. 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, weld procedure/route record, hydrostatic or NDE, seam UT/RT/ET as ordered, PMI, dimensions and optional corrosion testing. The final inspection scope must be agreed before order placement.

7. Is it suitable for the intended corrosive or high-temperature service? Product-standard compliance does not establish ASME pressure rating or corrosion suitability. Verify schedule, design code, weld joint factor and environment. A material engineer should approve the final choice using actual service data.

8. What fabrication issues should be addressed? Field girth welds require a separate qualified WPS/PQR. Control iron contamination, arc strikes, root oxidation and interpass temperature. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.

9. What are typical applications? Common candidate applications include offshore process piping, scrubber duct and piping, chemical transfer lines, seawater systems after design review. These examples are not blanket design approvals.

10. 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.