Gnee Steel's ASTM B670 standard primarily applies to Inconel 718 (UNS N07718), a standard that specifies various products including sheet, coil, and strip. This standard material is mainly used in high-temperature applications. This article summarizes the key points and details of ASTM B670 to help you better control quality when procuring materials.
Everything you need to know about ASTM B670 718 alloy
Everything you need to know about ASTM B670 718 alloy
ASTM B670 specifies Inconel 718 (UNS NO7718) alloy, a high-strength, corrosion-resistant nickel-chromium-iron precipitation-hardening superalloy. It is designed to maintain excellent strength at temperatures up to 1300°F (705°C) and in cryogenic environments, and is commonly used in aerospace engines, gas turbines, and oil/gas components.
What are the limitations of Inconel 718?
Due to the relatively low thermal conductivity of nickel-based alloys such as Inconel 718, heat tends to accumulate at the tool tip during machining. This can lead to excessive tool wear, shortening tool life or reducing machining speed.
ASTM B670 Inconel 718 Alloy
The ASTM B670 standard includes only one material: Inconel 718 (UNS N07718). Inconel 718 is a precipitation-strengthened superalloy with excellent high-temperature resistance and corrosion resistance. Through solution treatment and aging treatment, extremely high high-temperature strength can be achieved. Therefore, it is often used in a variety of extreme environments.
Inconel 718 plate chemical composition
| Element | Symbol | Content Range (%) |
|---|---|---|
| Nickel | Ni | 50.0 – 55.0 |
| Chromium | Cr | 17.0 – 21.0 |
| Iron | Fe | Balance |
| Niobium + Tantalum | Nb+Ta | 4.75 – 5.50 |
| Molybdenum | Mo | 2.80 – 3.30 |
| Titanium | Ti | 0.65 – 1.15 |
| Aluminum | Al | 0.20 – 0.80 |
| Carbon | C | ≤ 0.08 |
| Cobalt | Co | ≤ 1.00 |
| Manganese | Mn | ≤ 0.35 |
| Silicon | Si | ≤ 0.35 |
| Phosphorus | P | ≤ 0.015 |
| Sulfur | S | ≤ 0.015 |
| Boron | B | ≤ 0.006 |
Products conforming to ASTM B670 and Inconel 718 standards
ASTM A670 applies to sheet, plate, coil, and strip. Generally, cold-rolled materials with a thickness of 0.25 to 6.4 mm are defined as sheet; hot-rolled materials with a thickness of 4.8 to 57.2 mm are defined as plate; coil is a rolled sheet or plate. Strip is much narrower than coil and can be obtained by slitting coils or directly by cold rolling. Strip typically has higher strength.
| Nominal Thickness, in. (mm) |
Tensile Strength min, ksi (MPa) |
Yield Strength (0.2% offset) min. ksi (MPa) |
Elongation in 2 in. or 50 mm (or 4D), min, % |
|
|---|---|---|---|---|
| Inconel 718 (UNS N07718) | ||||
| Up to 1.0 (25.4), incl | 180 (1241) | 150 (1034) | 12 | |
| Over 1.0 to 2.25 (25.4 to 57.2), incl |
180 (1241) | 150 (1034) | 10 | |
ASTM B670 Inconel 718 Sheet Dimension
The dimensional tolerances of the materials shall meet the requirements of the following table:
| Specified Thickness, in. (mm) | Permissible Excess in Average Weight B,C per Square Foot of Plates for Widths Given in Inches (Millimetres) Expressed in Percent of Nominal Weights |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Under 48 (1220) | 48 to 60 (1220 to 1520), excl | 60 to 72 (1520 to 1830), excl | 72 to 84 (1830 to 2130), excl | 84 to 96 (2130 to 2440), excl | 96 to 108 (2440 to 2740), excl | 108 to 120 (2740 to 3050), excl | 120 to 132 (3050 to 3350), excl | 132 to 144 (3350 to 3660), excl | 144 to 160 (3660 to 4070), excl | |
| 3/16 to 5/16 (4.8 to 7.9), excl | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | ... | ... | ... |
| 5/16 to 3/8 (7.9 to 9.5), excl | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | ... | ... |
| 3/8 to 7/16 (9.5 to 11.1), excl | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | 19.5 |
| 7/16 to 1/2 (11.1 to 12.7), excl | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 |
| 1/2 to 5/8 (12.7 to 15.9), excl | 5.0 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 |
| 5/8 to 3/4 (15.9 to 19.1), excl | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 |
| 3/4 to 1 (19.1 to 25.4), excl | 4.0 | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 |
| 1 to 2 (25.4 to 50.8), incl | 4.0 | 4.0 | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 |
ASTM B670 standard primarily applies to the production of Inconel 718 sheets, rolls, and strips. This standard clearly specifies the material's chemical composition and mechanical properties, and provides specific requirements for edge and flatness. Suppliers should produce materials according to this standard and provide the corresponding material testing certificates before shipment.
We strictly adhere to the ASTM B670 standard in the production of Inconel 718 materials. Please contact us if needed; we are happy to assist you.
Gnee Steel also supplies custom Inconel 718 sheets in various sizes and specifications. Please send us your drawings for a quote!
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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