ASTM B622 Alloy C22 Seamless Pipe & Tube, Annealed | UNS N06022

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm b622 alloy c22 seamless pipe & tube, annealed | uns n06022 for buyers whose primary search intent is seamless pressure and heat-transfer product for chemical 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. Solution-annealed seamless Alloy C22 pipe and tube to ASTM B622 for chemical transfer, pressure containment and heat-transfer applications.

The material decision should start with service conditions. Low-carbon Ni-Cr-Mo-W alloy selected for broad resistance in mixed oxidizing/reducing chemicals and chloride-bearing environments. Use welded tube when size/economics favor it and the weld route is acceptable; use seamless when the design or purchaser specifically prohibits a longitudinal weld. 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 for pipe or OD/wall for tube, plus length, ends, tolerance and governing design code. Availability depends strongly on size. 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. Seamless hot extrusion/piercing and cold finishing as required, followed by solution annealing, sizing and NDE. The baseline verification plan is: MTC, chemistry/mechanical tests, hydrostatic or permitted NDE, optional eddy current/UT, PMI and dimensional inspection. 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: Use qualified nickel-alloy welding practice for field joints. Avoid sulfur, grease, marker contamination and excessive interpass temperature. Selection boundary: B622 product compliance does not set system pressure rating. Wall, temperature, corrosion allowance, fittings and the design code control allowable pressure. 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 transfer lines.
• Reactor dip pipes.
• Sampling and injection systems.
• Chemical heat exchangers.

Buyer Decision Boundary

Use welded tube when size/economics favor it and the weld route is acceptable; use seamless when the design or purchaser specifically prohibits a longitudinal weld.

Processing, Inspection and Documentation

• Manufacturing: Seamless hot extrusion/piercing and cold finishing as required, followed by solution annealing, sizing and NDE.
• Fabrication: Use qualified nickel-alloy welding practice for field joints. Avoid sulfur, grease, marker contamination and excessive interpass temperature.
• Inspection: MTC, chemistry/mechanical tests, hydrostatic or permitted NDE, optional eddy current/UT, PMI and dimensional inspection.
• 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 B622
• Grade / UNS: Alloy C22 / N06022
• Form and route: Seamless pipe and tube
• 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 B622 cover for this product? Solution-annealed seamless Alloy C22 pipe and tube to ASTM B622 for chemical transfer, pressure containment and heat-transfer applications. 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: Seamless pipe and tube. Do not rely on a product photograph or a family name to establish the route.
3. How should buyers select Alloy C22? Low-carbon Ni-Cr-Mo-W alloy selected for broad resistance in mixed oxidizing/reducing chemicals and chloride-bearing environments. Use welded tube when size/economics favor it and the weld route is acceptable; use seamless when the design or purchaser specifically prohibits a longitudinal weld.
4. Which dimensions must be included in the RFQ? Specify NPS/schedule for pipe or OD/wall for tube, plus length, ends, tolerance and governing design code. Availability depends strongly on size. Add quantity, unit basis, tolerances and any drawing-controlled geometry.
5. What heat-treatment or delivery condition is required? Solution annealed and descaled. Pipe/tube designation, actual dimensions and heat-treatment record must appear in order documents. 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, hydrostatic or permitted NDE, optional eddy current/UT, PMI and dimensional inspection. The final inspection scope must be agreed before order placement.
7. Is it suitable for the intended corrosive or high-temperature service? B622 product compliance does not set system pressure rating. Wall, temperature, corrosion allowance, fittings and the design code control allowable pressure. A material engineer should approve the final choice using actual service data.
8. What fabrication issues should be addressed? Use qualified nickel-alloy welding practice for field joints. Avoid sulfur, grease, marker contamination and excessive interpass temperature. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.
9. What are typical applications? Common candidate applications include acid transfer lines, reactor dip pipes, sampling and injection systems, chemical heat exchangers. 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.