ASTM B409 Alloy 800HT Plate & Sheet for Creep Service | N08811

Product Specification

ASTM B409 Alloy 800HT Plate & Sheet for Creep Service | N08811

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies astm b409 alloy 800ht plate & sheet for creep service | n08811 for buyers whose primary search intent is high-temperature creep- and rupture-controlled flat product, 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. Alloy 800HT plate and sheet to ASTM B409 for elevated-temperature equipment where controlled chemistry, annealing and grain size support creep performance.

The material decision should start with service conditions. Ni-Fe-Cr alloy with restricted carbon, aluminum and titanium ranges and a controlled solution-annealed grain structure for high-temperature strength. Alloy 601 may be preferred for oxidation-scale performance; 800HT is selected when allowable stresses and creep/rupture behavior drive the design. 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 thickness, width, length, edge, flatness, required grade/UNS and any grain-size or supplementary high-temperature tests. 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. Rolling, controlled solution annealing, grain-size verification, leveling and cutting with complete grade traceability. The baseline verification plan is: MTC, chemistry/mechanical tests, grain-size/heat-treatment records as required, PMI, dimensions 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: Welding procedure, filler and any post-fabrication treatment must preserve the design basis. Avoid confusing weld-metal strength with base-metal allowables. Selection boundary: 800HT is a precise material condition, not a generic trade name. Verify UNS N08811, chemistry restrictions, heat treatment, grain size and code allowables. 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

· Petrochemical furnace components.

· Reformer outlet hardware.

· High-temperature heat exchangers.

· Process-heater and steam-system parts.

Buyer Decision Boundary

Alloy 601 may be preferred for oxidation-scale performance; 800HT is selected when allowable stresses and creep/rupture behavior drive the design.

Processing, Inspection and Documentation

· Manufacturing: Rolling, controlled solution annealing, grain-size verification, leveling and cutting with complete grade traceability.

· Fabrication: Welding procedure, filler and any post-fabrication treatment must preserve the design basis. Avoid confusing weld-metal strength with base-metal allowables.

· Inspection: MTC, chemistry/mechanical tests, grain-size/heat-treatment records as required, PMI, dimensions 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 B409

· Grade / UNS: Alloy 800HT / N08811

· Form and route: Plate, sheet and strip

· 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 B409 cover for this product? Alloy 800HT plate and sheet to ASTM B409 for elevated-temperature equipment where controlled chemistry, annealing and grain size support creep performance. 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: Plate, sheet and strip. Do not rely on a product photograph or a family name to establish the route.

3. How should buyers select Alloy 800HT? Ni-Fe-Cr alloy with restricted carbon, aluminum and titanium ranges and a controlled solution-annealed grain structure for high-temperature strength. Alloy 601 may be preferred for oxidation-scale performance; 800HT is selected when allowable stresses and creep/rupture behavior drive the design.

4. Which dimensions must be included in the RFQ? State thickness, width, length, edge, flatness, required grade/UNS and any grain-size or supplementary high-temperature tests. Add quantity, unit basis, tolerances and any drawing-controlled geometry.

5. What heat-treatment or delivery condition is required? Solution annealed to the 800HT requirements. Do not substitute 800, 800H and 800HT without code/design approval. 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, grain-size/heat-treatment records as required, PMI, dimensions 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? 800HT is a precise material condition, not a generic trade name. Verify UNS N08811, chemistry restrictions, heat treatment, grain size and code allowables. A material engineer should approve the final choice using actual service data.

8. What fabrication issues should be addressed? Welding procedure, filler and any post-fabrication treatment must preserve the design basis. Avoid confusing weld-metal strength with base-metal allowables. Use a qualified procedure and preserve heat/lot traceability after cutting or fabrication.

9. What are typical applications? Common candidate applications include petrochemical furnace components, reformer outlet hardware, high-temperature heat exchangers, process-heater and steam-system parts. 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.