{"id":19605,"date":"2026-09-20T15:33:57","date_gmt":"2026-09-20T07:33:57","guid":{"rendered":"https:\/\/daxuns.com\/?p=19605"},"modified":"2026-09-20T15:33:57","modified_gmt":"2026-09-20T07:33:57","slug":"inconel-690-sheet-plate","status":"publish","type":"post","link":"https:\/\/daxuns.com\/es\/inconel-690-sheet-plate\/","title":{"rendered":"Inconel 690 Sheet and Plate: ASTM B168-26 Procurement Guide"},"content":{"rendered":"\n

Direct answer:<\/strong> Inconel 690 sheet and plate are high-chromium nickel-alloy flat products identified as UNS N06690. For a defensible order, specify ASTM B168-26 with ASTM B906-22, the exact product form and condition, decimal dimensions, surface and edge requirements, testing, documentation, and service environment. Standard Alloy 690 plate is not automatically Alloy 690TT or nuclear-qualified material.[1]<\/sup>[2]<\/sup><\/p><\/div><\/div>\n\n\n\n

ALLOY 690 FLAT-PRODUCT PROCUREMENT GUIDE<\/p>

Fix the exact form, standard edition, condition, dimensions, surface, inspection and service environment before comparing Alloy 690 quotations.<\/strong><\/p><\/div><\/div>\n\n\n\n

\"Inconel
Specify the exact flat-product form, condition, dimensions, inspection and traceability before comparing Alloy 690 quotations.<\/figcaption><\/figure>\n\n\n\n

Alloy 690 is selected when a component needs a combination of resistance to oxidizing media, high-temperature oxidation or sulfidation, and stress-corrosion cracking in certain aqueous environments. Those strengths come mainly from its high chromium and nickel contents. They do not turn the alloy into a universal answer for every acid, caustic, chloride, nuclear, or high-temperature duty. Temperature, concentration, contaminants, stress, cold work, weld condition, deposits, and the governing construction code still control the decision.[3]<\/sup>[4]<\/sup><\/p>\n\n\n\n

DAXUN manufactures Alloy 690 sheet and plate and performs agreed cutting, forming, heat-treatment, machining, and fabrication operations in-house. We review each enquiry against the stated standard, dimensions, condition, service, and inspection plan. Stock, size capability, nuclear requirements, third-party witnessing, and delivery must be confirmed in the written quotation rather than assumed from a generic grade description.<\/p>\n\n\n\n

1. Start with the product form, not only the alloy name<\/h2>\n\n\n\n

The first purchasing decision is whether the requirement is genuinely for plate or sheet. ASTM B168-26 covers rolled UNS N06690 plate, sheet, and strip, while ASTM B906-22 supplies general requirements for flat-rolled nickel and nickel-alloy products.[1]<\/sup>[2]<\/sup> The individual material specification and the general requirements work together; the purchase order can add project-specific controls.<\/p>\n\n\n\n

A practical procurement distinction is:<\/p>\n\n\n\n

Product form<\/th>How to define it safely<\/th>What the RFQ must control<\/th><\/tr>
Plate<\/td>Use the controlled B168\/B906 definition and the ordered mill form; do not infer plate from appearance alone<\/td>Thickness, width, length, flatness, edge route, surface, condition, and plate-specific acceptance<\/td><\/tr>
Sheet<\/td>Use the controlled B168\/B906 definition and identify sheet versus cut-to-length strip<\/td>Decimal thickness, width, length or cut length, finish, flatness, protection, and sheet-specific acceptance<\/td><\/tr>
Strip<\/td>Define the cold-rolled strip or coil route under the controlled specification<\/td>Temper, coil build, edge, camber, finish, and strip tolerances<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The applicable definitions must be checked in the controlled editions named in the purchase order. A coiled flat product is not automatically \u201csheet,\u201d and a narrow cut length is not automatically \u201cstrip.\u201d The ordered form determines which dimensional tables, mechanical-property rows, finishes, and sampling rules apply.<\/p>\n\n\n\n

That distinction also prevents terminology-driven specification errors. A page that advertises \u201csheet, plate, and coil\u201d with one mechanical table may be commercially convenient, but the buyer still needs the mill form, condition, and acceptance route for the actual item. If your requirement is narrow cold-rolled coil, use a strip\/coil specification. If it is a machined thick component, identify whether the starting product is plate, forging, or another wrought form before asking for certification.<\/p>\n\n\n\n

2. What is Alloy 690?<\/h2>\n\n\n\n

Alloy 690 is an austenitic, solid-solution nickel-chromium-iron alloy. Its common identifiers are UNS N06690 and W.Nr. 2.4642. \u201cINCONEL\u201d is a Special Metals trademark; procurement documents should retain the generic UNS designation so that grade identity is unambiguous.[3]<\/sup><\/p>\n\n\n\n

The alloy is not precipitation hardened in the way age-hardenable nickel alloys are. Its performance depends on the melt chemistry, wrought processing, grain structure, annealing or solution annealing, subsequent cold work, surface condition, and any application-specific thermal treatment. Ordering only \u201cInconel 690 plate\u201d leaves too many variables unresolved.<\/p>\n\n\n\n

The producer-published limiting chemistry below is consistent across major Alloy 690 data sources. It is useful for grade identification, but the purchase order and current governing standard control the delivered heat.<\/p>\n\n\n\n

Element<\/th>Producer-published limit, wt.%<\/th>Engineering significance<\/th><\/tr>
Nickel<\/td>58.0 min<\/td>Supports austenitic stability and resistance to several stress-corrosion environments<\/td><\/tr>
Chromium<\/td>27.0\u201331.0<\/td>Supports protective oxide formation in oxidizing aqueous and high-temperature environments<\/td><\/tr>
Iron<\/td>7.0\u201311.0<\/td>Controlled principal constituent, not an unspecified balance<\/td><\/tr>
Carbon<\/td>0.05 max<\/td>Influences carbide population and response to thermal processing<\/td><\/tr>
Manganese<\/td>0.50 max<\/td>Controlled residual\/addition<\/td><\/tr>
Silicon<\/td>0.50 max<\/td>Controlled residual\/addition<\/td><\/tr>
Copper<\/td>0.50 max<\/td>Controlled residual<\/td><\/tr>
Sulfur<\/td>0.015 max<\/td>Controlled impurity; external sulfur contamination during heating is a separate risk<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Special Metals separately lists nuclear-application amendments of 28\u201331% chromium, 0.04% maximum carbon, and 0.10% maximum cobalt.[3]<\/sup> These tighter values must not be presented as the universal chemistry of every B168 order. A purchaser requiring low cobalt, narrower carbon, residual-element reporting, controlled melting, inclusion limits, or a project-specific nuclear chemistry must state those requirements independently.<\/p>\n\n\n\n

3. Mechanical properties depend on form, condition, thickness, and source<\/h2>\n\n\n\n

There is no responsible single row called \u201cthe mechanical properties of Inconel 690 sheet and plate.\u201d The current ASTM public catalogue confirms that B168 controls mechanical properties, chemistry, dimensions, and grain size, but it does not expose every copyrighted table.[1]<\/sup> Published values must therefore retain their producer, product form, condition, and evidence type.<\/p>\n\n\n\n

Product and condition<\/th>0.2% yield strength<\/th>Tensile strength<\/th>Elongation<\/th>How to use the row<\/th><\/tr>
ATI 690 plate, listed to ASTM B168 \/ ASME SB-168<\/td>30 ksi (206 MPa) min<\/td>75 ksi (514 MPa) min<\/td>30% min<\/td>Producer-published minimum for ATI’s listed plate route; verify the current PO and MTC<\/td><\/tr>
VDM Alloy 690 sheet\/strip, solution annealed, listed as ASTM B168 minimum<\/td>240 MPa (34.8 ksi) min<\/td>586 MPa (85 ksi) min<\/td>30% min<\/td>Producer-published minimum for its sheet\/strip route; not a universal plate row<\/td><\/tr>
Special Metals hot-rolled flat, annealed at 1900\u00b0F (1040\u00b0C), 13 \u00d7 51 mm<\/td>51.0 ksi (352 MPa)<\/td>102.0 ksi (703 MPa)<\/td>46%<\/td>Representative producer test result, not an ASTM acceptance guarantee<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The gap between the rows is not evidence that one source is wrong. It shows that form, condition, size, and the purpose of the number matter. A producer typical value describes tested material; a specification minimum defines an acceptance floor for the applicable route. Neither is automatically a design allowable stress.<\/p>\n\n\n\n

For pressure equipment, high-temperature equipment, or nuclear components, use the allowable stresses and design rules in the applicable construction code and project edition. Do not derive pressure rating, creep life, fatigue life, or thermal-cycle life from a room-temperature tensile table.<\/p>\n\n\n\n

What should appear on the material certificate?<\/h3>\n\n\n\n

At minimum, the certificate and traceability package should make it possible to connect the delivered piece to its heat, production lot, ordered specification and edition, form, condition, chemistry, applicable mechanical results, dimensions, and heat treatment. The buyer should not accept a certificate that lists only \u201cN06690\u201d without the product form and condition needed to interpret the results.<\/p>\n\n\n\n

4. Annealed Alloy 690 is not automatically Alloy 690TT<\/h2>\n\n\n\n

Special Metals describes Alloy 690 as normally used in the annealed condition and gives approximately 1900\u00b0F (1040\u00b0C) as a usual annealing temperature.[3]<\/sup> VDM gives producer guidance for solution annealing and rapid cooling, with the exact route depending on product thickness and intended high-temperature properties.[5]<\/sup> These values are processing guidance, not a substitute for the ordered condition or a qualified furnace procedure.<\/p>\n\n\n\n

The term Alloy 690TT<\/strong> normally refers to an additional controlled thermal treatment associated most prominently with nuclear steam-generator tubing and other qualified nuclear products. Its purpose includes developing a specified grain-boundary carbide distribution and controlling residual stress after final mill processing. Producer and EPRI guidance describes project-specific thermal cycles around 700\u2013740\u00b0C for roughly ten hours, but those cycles are not a general ASTM B168 requirement for sheet and plate.[5]<\/sup>[10]<\/sup><\/p>\n\n\n\n

If a drawing calls for \u201c690TT plate,\u201d do not interpret the suffix from a marketing page. Ask the design authority for the controlling project specification and acceptance criteria, including:<\/p>\n\n\n\n