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Inconel 625 and Alloy 6219 Plate, Sheet and Strip
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Inconel 625 and Alloy 6219 are nickel-chromium-molybdenum alloys supplied as plate, sheet and strip. Both are solid solution strengthened with no age-hardening treatment, and are used where chloride corrosion and high-temperature strength are needed together. This page covers the rolled flat product form to ASME SB-443, including the 625 Grade 1 and 2 distinction.
Specification Coverage
ASME SB-443 covers rolled nickel-chromium-molybdenum-columbium alloy UNS N06625 and nickel-chromium-molybdenum-silicon alloy UNS N06219 as plate, sheet and strip. Tolerances follow ASME B906. Matching forms:
- SB-444 — cold-worked seamless pipe and tube
- SB-446 — rod, bar, wire
- SB-366 — wrought fittings, where N06625 carries its own Grade 1 and 2 provisions
- SB-462 — forged flanges and fittings
- SB-704 — welded N06625, N06219 and N08825 tubes
Grade Comparison
| Grade | UNS | Ni | Cr | Mo | Nb+Ta | Si | Key Characteristic |
|---|---|---|---|---|---|---|---|
| Inconel 625 Gr.1 | N06625 | 58.0 min | 20.0-23.0 | 8.0-10.0 | 3.15-4.15 | 0.50 max | Annealed, higher strength |
| Inconel 625 Gr.2 | N06625 | 58.0 min | 20.0-23.0 | 8.0-10.0 | 3.15-4.15 | 0.50 max | Solution annealed, higher ductility |
| Alloy 6219 | N06219 | 44.5 min | 18.0-22.0 | 7.0-9.0 | — | 0.70-1.10 | Si-bearing, lower Ni, high strength |
| Inconel 600 | N06600 | 72.0 min | 14.0-17.0 | — | — | — | Higher Ni, no Mo |
Alloy 6219 trades roughly 13 percentage points of nickel for 0.7-1.1% silicon. Against Inconel 600, the 8-10% molybdenum raises pitting resistance substantially.
Chemical Composition (ASME SB-443 Table 2)
| Element | UNS N06625 (%) | UNS N06219 (%) | Limit Type |
|---|---|---|---|
| Carbon | 0.10 max | 0.05 max | max |
| Manganese | 0.50 max | 0.50 max | max |
| Silicon | 0.50 max | 0.70-1.10 | range |
| Phosphorus | 0.015 max | 0.020 max | max |
| Sulfur | 0.015 max | 0.010 max | max |
| Chromium | 20.0 min / 23.0 max | 18.0-22.0 | range |
| Columbium + tantalum | 3.15 min / 4.15 max | — | range |
| Cobalt (if determined) | 1.0 max | 1.0 max | max |
| Molybdenum | 8.0 min / 10.0 max | 7.0-9.0 | range |
| Iron | 5.0 max | 2.0-4.0 | range |
| Aluminum | 0.40 max | 0.50 max | max |
Niobium plus tantalum stabilises 625, while silicon strengthens 6219. Iron is 5.0% maximum in 625 and 2.0-4.0% in 6219.
Mechanical Properties (ASME SB-443 Table 3)
| Grade | Product | Condition | Tensile, min ksi (MPa) | Yield 0.2%, min ksi (MPa) | Elongation, min % |
|---|---|---|---|---|---|
| N06625 Gr.1 | Cold-rolled sheet and strip | Annealed | 120 (827) | 60 (414) | 30 |
| N06625 Gr.1 | Hot-rolled sheet and hot-rolled plate up to 2.75 in. (70 mm) | Annealed | 110 (758) | 55 (379) | 30 |
| N06625 Gr.1 | Cold-rolled plate up to 0.375 in. (9.5 mm) | Annealed | 110 (758) | 55 (379) | 30 |
| N06625 Gr.2 | Cold-rolled sheet and strip, hot-rolled sheet, cold-rolled plate, hot-rolled plate | Solution annealed | 100 (690) | 40 (276) | 30 |
| N06219 | All plate, sheet and strip | Solution annealed | 96 (660) | 39 (270) | 30 |
Grade 1 is annealed at 1600°F (871°C) minimum; Grade 2 is solution annealed, giving lower tensile and yield figures with greater ductility. Grade 1 cold-rolled sheet and strip, at 120 ksi (827 MPa) tensile, is the strongest condition.
Grade 1 versus Grade 2
The split matters when a design relies on minimum strength. Grade 2 suits pressure vessel fabrication, welding and forming, and is what most suppliers supply when no grade is stated. State the grade explicitly if the design needs Grade 1.
Product Forms and Size Range
SB-443 Table 1 gives the product ranges against ASME B906 tables: hot-rolled plate 3/16 in. (4.8 mm) and over; cold-rolled plate 3/16 to 3/8 in. (4.8 to 9.5 mm) inclusive; hot-rolled and cold-rolled sheet 0.018 to 0.250 in. (0.46 to 6.4 mm) inclusive; cold-rolled strip 0.005 to 0.250 in. (0.13 to 6.4 mm) inclusive. Material between 3/16 and 1/4 in. (4.8 and 6.4 mm) may be furnished as sheet or plate provided it meets the condition ordered.
Applications
- Chemical process vessels and columns
- Seawater desalination and brine handling
- Flue gas desulphurisation absorbers
- Pollution control equipment
- Pressure vessel shells and heads
- Furnace internals and heat shields
- Sour service equipment
Certification and Inspection
Material is supplied with a mill test certificate per EN 10204 3.1 unless otherwise specified. Available inspection items include:
- Full chemical analysis and product (check) analysis on request
- Tensile testing with test reports, and hardness testing
- Intergranular corrosion testing to ASTM A262 where specified
- Positive material identification (PMI) verification
- Non-destructive examination including ultrasonic testing
- Third-party inspection by an internationally recognised agency
Ordering Information
Please include the following when requesting a quotation:
- Alloy and grade: UNS N06625 Grade 1, UNS N06625 Grade 2, or UNS N06219
- Product form: hot-rolled or cold-rolled plate, sheet or strip
- Thickness and width, and length if cut-to-length is required
- Quantity and delivery schedule
- Certification: MTC per EN 10204 3.1, and any supplementary requirements
- Inspection and testing requirements
- Shipping terms and destination port
Send the grade, dimensions and service environment, and we will confirm material, availability and an FOB quotation.
Related specifications and products. Inconel 625 and Alloy 621 are also supplied as seamless pipe and tube and as butt weld fittings. See the hot rolled nickel alloy plate listing Inconel 625 and Alloy 621 seamless pipe Inconel 625 butt weld fitting range for the dimensional and material basis behind this page.
