ASTM B443 Inconel 625 UNS N06625 Sheet & Plate
Inconel 625 Sheet & Plate — ASTM B443 / UNS N06625
Inconel 625 sheet and plate combine strong resistance to pitting, crevice corrosion and chloride stress-corrosion cracking with good weldability and strength across a wide temperature range. SASA Alloy supplies UNS N06625 flat products for chemical processing, marine, pollution-control, aerospace and power-industry projects.
For a quotation, send the required standard and edition, Grade 1 or Grade 2 condition, thickness × width × length, quantity, surface condition, dimensional tolerance, inspection and certificate requirements. Standard and special sizes can be supplied; current availability and delivery time are confirmed against the requested size and quantity.
Quick Purchasing Specifications
| Material | Inconel 625 / Alloy 625 / UNS N06625 / W.Nr. 2.4856 |
|---|---|
| Product forms | Plate, sheet, cut plate, blank and cut-to-size flat product |
| Primary standards | ASTM B443 / ASME SB-443; AMS 5599 for applicable sheet and strip orders |
| Typical thickness range | 0.1–100 mm; thicker or special-gauge requirements reviewed by inquiry |
| Typical width | Up to 2,500 mm, subject to thickness, condition and mill route |
| Typical length | Up to 6,000 mm; standard and cut-to-length sizes available by order |
| Common sheet / plate formats | 1,000 × 2,000 mm, 1,220 × 2,440 mm, 1,500 × 3,000 mm, 2,000 × 4,000 mm, plus cut-to-size formats |
| Surface / finish | Hot rolled, cold rolled, annealed, pickled/descaled or polished as specified |
| Edges and tolerances | Mill edge, slit or cut edge; dimensional tolerance and flatness to the ordered standard or project drawing |
| Processing options | Shearing, sawing, waterjet, plasma or laser cutting selected according to thickness and edge-quality requirement |
The final supply range, tolerances and processing method are confirmed against the purchase specification and required quantity.
ASTM B443 Grade 1 vs Grade 2
| Purchase item | Grade 1 | Grade 2 |
|---|---|---|
| Heat-treatment condition | Annealed | Solution annealed |
| Normal service selection | Normally employed up to 1100°F (593°C) | Normally employed above 1100°F (593°C) when creep and rupture resistance are required |
| Purchasing instruction | State ASTM B443 Grade 1 and the required standard edition | State ASTM B443 Grade 2, standard edition and elevated-temperature design requirement |
ASTM B443 identifies the two grades by heat-treatment condition. Hot working or reannealing can materially change properties, so the required grade and condition should appear on the purchase order and MTC.
Chemical Composition — UNS N06625
| Ni | Cr | Mo | Nb + Ta | Fe | C | Mn | Si | P | S | Al | Ti | Co* |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ≥58.0 | 20.0–23.0 | 8.0–10.0 | 3.15–4.15 | ≤5.0 | ≤0.10 | ≤0.50 | ≤0.50 | ≤0.015 | ≤0.015 | ≤0.40 | ≤0.40 | ≤1.0 |
Limiting composition in weight percent; *cobalt is reported when determined. The applicable standard edition and certified heat analysis govern the order.
Typical Room-Temperature Mechanical Properties
| Form and condition | Tensile strength (MPa) | 0.2% yield strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| Plate — annealed | 827–1,034 | 414–655 | 30–60 | 145–220 |
| Plate — solution treated | 724–896 | 290–414 | 40–65 | 116–194 |
| Sheet / strip — annealed | 827–1,034 | 414–621 | 30–55 | 145–240 |
These are typical manufacturer data for common product sizes, not acceptance limits. Purchase-order acceptance values must follow the specified ASTM/ASME/AMS edition, grade, thickness and certified MTC.
Physical Properties
| Density | 8.44 g/cm³ (0.305 lb/in³) |
|---|---|
| Melting range | 1,290–1,350°C (2,350–2,460°F) |
| Specific heat at 21°C | 410 J/kg·°C |
| Thermal conductivity at 21°C | 9.8 W/m·°C |
| Electrical resistivity at 21°C | 1.29 µΩ·m |
Designations and Flat-Product Standards
| System / market | Designation or applicable flat-product specification |
|---|---|
| UNS / Werkstoff / ISO designation | UNS N06625 / W.Nr. 2.4856 / ISO NW6625 |
| ASTM / ASME | ASTM B443 / ASME SB-443 — plate, sheet and strip |
| SAE / AMS | AMS 5599 and AMS 5869 for applicable plate, sheet and strip requirements |
| ISO / European references | ISO 6208, EN 10095, DIN 17750; BS 3072 NA21 for plate and sheet |
Equivalent designations do not make different specifications interchangeable. The buyer should state the governing standard, edition, grade, dimensions and inspection requirements.
Why Buyers Specify Alloy 625 Flat Products
- Corrosion resistance: suitable for demanding chloride-bearing, seawater and chemical-process environments after project-specific material review.
- Strength without precipitation hardening: molybdenum and niobium strengthen the nickel-chromium matrix.
- Fabrication flexibility: good weldability and availability in sheet, plate and cut-to-size forms support fabricated equipment.
- Condition selection: ASTM B443 Grade 1 and Grade 2 provide a clear route for matching corrosion service or elevated-temperature creep requirements.
Inspection, Testing & Documentation
Inspection and documentation are quoted according to the purchase order. Available requirements can include:
Raw-material certificates, order documentation and after-sales support can be arranged with the supply scope. Commercial inquiries are normally answered within 24 hours on working days.
Typical Applications
Fabricated components exposed to chloride-bearing service
Vessels, linings and process equipment
Scrubber and flue-gas handling components
High-temperature fabricated parts subject to design approval
Ordering Checklist
- Material: Inconel 625 / UNS N06625
- Standard and required edition: ASTM B443, ASME SB-443 or applicable AMS specification
- Grade / heat-treatment condition: Grade 1 annealed or Grade 2 solution annealed
- Product form and dimensions: thickness × width × length
- Quantity, surface condition and protective-film requirement
- Dimensional tolerances, flatness and edge condition
- Required MTC, inspection, testing and third-party witness requirements
- Cutting, marking, packing and destination requirements
Frequently Asked Questions
What standard covers Inconel 625 sheet and plate?
ASTM B443 covers rolled UNS N06625 plate, sheet and strip. ASME SB-443 is commonly specified for ASME-related orders, while AMS 5599 applies to relevant aerospace sheet and strip requirements.
Should I specify Grade 1 or Grade 2?
Grade 1 is normally used up to 1100°F (593°C). Grade 2 is normally selected above that temperature when creep and rupture resistance are required. The design code and service conditions should control the final choice.
Can Inconel 625 plate be cut to custom dimensions?
Yes. Cut-to-size plate and blanks can be supplied using a method selected for the thickness, tolerance, edge-quality and heat-affected-zone requirements.
What information is needed for an accurate quotation?
Provide the material and standard, grade/condition, dimensions, quantity, surface, tolerance, inspection, certificate, processing, packing and delivery-destination requirements.
