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Everything You need to Know about ASTM B670

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Overview

ASTM B670 is mainly applicable to Inconel 718 (UNS N07718), which specifies products including sheet, plate, coil and strip. This standard material is primarily used for high temperature applications. In this article, we will summarize the important points and details of ASTM B670. This helps you have more control over quality when purchasing materials.

Grades & Chemical Composition

Grades

ASTM B670 contains only one material: Inconel 718 (UNS N07718). Inconel 718 is a precipitation strengthened superalloy. It itself has very good high temperature resistance and corrosion resistance. Through solution treatment and aging treatment, it can obtain very high high temperature strength. Therefore, it is often used in many extreme environments.

Chemical Composition

Inconel 718 (UNS N07718)

718

Si

C

Al

Ti

Co

Nb

Ta

Mo

Fe

Cr

Ni

Suppliers shall perform chemical analysis of the material in accordance with ASTM B906.

Product Properties

Products in ASTM B670

ASTM A670 applies to sheet, plate, coil and strip. Generally speaking, the thickness is 0.25 to 6.4mm, and the material produced by cold rolling is defined as sheet. And the thickness is 4.8 to 57.2mm, and the material produced by hot rolling is defined as plate. The coil is a rolled sheet or plate. The width of the strip is much narrower than that of the coil. It can be obtained by slitting the coil, or it can be obtained directly by cold rolling. Strip tends to have higher strength.

Mechanical Properties

Tensile Properties for Plate, Sheet, and Strip
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

Delivery State

Inconel 718 can be significantly increased in strength by aging treatment.

The standard specifies that Inconel 718 should be delivered in the annealed condition by default. But at the same time, the supplier needs to ensure that the material can reach the mechanical properties specified in the above table after aging treatment. Of course, you can also make a request to the supplier if you need the material to be delivered directly in an aging condition.

For Inconel 718, precipitation heat treatment (aging treatment) shall consist of heating to 1325±25°F (718±14°C), hold at temperature for 8 h, furnace cool to 1150±25°F (621±14°C), hold until total aging treatment time has reached 18 h, and then air cool.

Other Information

Dimension

The dimensional tolerances of the material shall meet the requirements of the following table (refer to ASTM B906):

Permissible Variations in Thickness and Overweight of Rectangular Plates
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
Permissible Variations in Thickness for Rectangular Plates Over 2 in. (51 mm) in Thickness
Specified Thickness, in. (mm) Permissible Variations, in. (mm), over Specified Thickness for Widths Given, in. (mm)
To 36 (915), excl 36 to 60 (915 to 1520), excl 60 to 84 (1520 to 2130), excl 84 to 120 (2130 to 3050), excl 120 to 132 (3050 to 3350), excl 132 (3350 and over)
Over 2 to 3 (51 to 76.0), incl 1/16 (1.6) 3/32 (2.4) 7/64 (2.8) 1/8 (3.2) 1/8 (3.2) 9/64 (3.6)
3 to 4 (76.0 to 102.0), incl 5/64 (2.0) 3/32 (2.4) 7/64 (2.8) 1/8 (3.2) 1/8 (3.2) 9/64 (3.6)
Permissible Variations in Thickness of Sheet and Strip
Measured 3/8 in. (9.5 mm) or more from either edge except for strip under 1 in. (25.4 mm) in width which is measured at any place.
Specified Thickness, in. (mm), incl Sheet
Hot-Rolled Cold-Rolled
48 (1220) and Under Over 48 to 60 (1220 to 1520), incl 48 (1220) and Under Over 48 to 60 (1220 to 1520), incl
0.018 to 0.025 (0.5 to 0.6) 0.003 (0.08) 0.004 (0.10) 0.002 (0.05) 0.003 (0.08)
Over 0.025 to 0.034 (0.6 to 0.9) 0.004 (0.10) 0.005 (0.13) 0.003 (0.08) 0.004 (0.10)
Over 0.034 to 0.043 (0.9 to 1.1) 0.005 (0.13) 0.006 (0.15) 0.004 (0.10) 0.005 (0.13)
Over 0.043 to 0.056 (1.1 to 1.4) 0.005 (0.13) 0.006 (0.15) 0.004 (0.10) 0.005 (0.13)
Over 0.056 to 0.070 (1.4 to 1.8) 0.006 (0.15) 0.007 (0.18) 0.005 (0.13) 0.006 (0.15)
Over 0.070 to 0.078 (1.8 to 1.9) 0.007 (0.18) 0.008 (0.20) 0.006 (0.15) 0.007 (0.18)
Over 0.078 to 0.093 (1.9 to 2.4) 0.008 (0.20) 0.009 (0.23) 0.007 (0.18) 0.008 (0.20)
Over 0.093 to 0.109 (2.4 to 2.8) 0.009 (0.23) 0.010 (0.25) 0.007 (0.18) 0.009 (0.23)
Over 0.109 to 0.125 (2.8 to 3.2) 0.010 (0.25) 0.012 (0.31) 0.008 (0.20) 0.010 (0.25)
Over 0.125 to 0.140 (3.2 to 3.6) 0.012 (0.31) 0.014 (0.36) 0.008 (0.20) 0.010 (0.25)
Over 0.140 to 0.171 (3.6 to 4.3) 0.014 (0.36) 0.016 (0.41) 0.009 (0.23) 0.012 (0.31)
Over 0.171 to 0.187 (4.3 to 4.8) 0.015 (0.38) 0.017 (0.43) 0.010 (0.25) 0.013 (0.33)
Over 0.187 to 0.218 (4.8 to 5.5) 0.017 (0.43) 0.019 (0.48) 0.011 (0.28) 0.015 (0.38)
Over 0.218 to 0.234 (5.5 to 5.9) 0.018 (0.46) 0.020 (0.51) 0.012 (0.31) 0.016 (0.41)
Over 0.234 to 0.250 (5.9 to 6.4) 0.020 (0.51) 0.022 (0.56) 0.013 (0.33) 0.018 (0.46)
Measured 3/8 in. (9.5 mm) or more from either edge except for strip under 1 in. (25.4 mm) in width which is measured at any place.
Standard sheet tolerances apply for thicknesses over 0.125 in. (3.2 mm) and for all thicknesses of strip over 12 in. (305 mm) wide.
Cold-Rolled
Up to 0.050 (1.27), incl 0.0015 (0.038)
Over 0.050 to 0.093 (1.27 to 2.39) 0.0025 (0.063)
Over 0.093 to 0.125 (2.39 to 3.18) 0.004 (0.11)
Permissible Variations in Length
Outside Diameter, in. (mm) Cut Length, in. (mm)
Over Under
Under 2 (50.8) 1/8 (3.2) 0
2 (50.8) and over 3/16 (4.8) 0
Permissible Variations in Width of Sheared, Plasma Torch-Cut, and Abrasive-Cut Rectangular Plate
Specified Thickness Permissible Variations in Widths for Widths Given, in. (mm)
Up to 30 (760), incl Over 30 to 72 (760 to 1830), incl Over 72 to 108 (1830 to 2740), incl Over 108 to 144 (2740 to 3660), incl Over 144 to 160 (3660 to 4070), incl
Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus
Inches
Sheared:
3/16 to 5/16, excl 3/16 1/8 1/4 1/8 3/8 1/8 1/2 1/8 ... ...
5/16 to 1/2, excl 1/4 1/8 3/8 1/8 3/8 1/8 1/2 1/8 5/8 1/8
1/2 to 3/4, excl 3/8 1/8 3/8 1/8 1/2 1/8 5/8 1/8 3/4 1/8
3/4 to 1, excl 1/2 1/8 1/2 1/8 5/8 1/8 3/4 1/8 7/8 1/8
1 to 1 1/4, incl 5/8 1/8 5/8 1/8 3/4 1/8 7/8 1/8 1 1/8
Abrasive-cut:
3/16 to 1 1/4, incl 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8
Over 1 1/4 to 2 3/4, incl 3/16 1/8 3/16 1/8 3/16 1/8 3/16 1/8 3/16 1/8
Plasma torch-cut:
3/16 to 2, excl 1/2 0 1/2 0 1/2 0 1/2 0 1/2 0
2 to 2 3/4, incl 5/8 0 5/8 0 5/8 0 5/8 0 5/8 0
Millimetres
Sheared:
4.8 to 7.9, excl 4.8 3.2 6.4 3.2 9.5 3.2 12.7 3.2 ... ...
7.9 to 12.7, excl 6.4 3.2 9.5 3.2 9.5 3.2 12.7 3.2 15.9 3.2
12.7 to 19.1, excl 9.5 3.2 9.5 3.2 12.7 3.2 15.9 3.2 19.1 3.2
19.1 to 25.4, excl 12.7 3.2 12.7 3.2 15.8 3.2 19.1 3.2 22.2 3.2
25.4 to 31.8, incl 15.9 3.2 15.9 3.2 19.1 3.2 22.2 3.2 25.4 3.2
Abrasive-cut:
4.8 to 31.8, incl 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2
Over 31.8 to 69.8, incl 4.8 3.2 4.8 3.2 4.8 3.2 4.8 3.2 4.8 3.2
Plasma torch-cut:
4.8 to 50.8, excl 12.7 0 12.7 0 12.7 0 12.7 0 12.7 0
50.8 to 69.8, incl 15.9 0 15.9 0 15.9 0 15.9 0 15.9 0
Permissible Variations in Diameter for Circular Plates
Sheared Plate
Specified Diameter, in. (mm) Permissible Variations Over Specified Diameter for Thickness Given, in. (mm)
To 3⁄8 (9.5), incl
20 to 32 (508 to 813), excl 1/4 (6.4)
32 to 84 (813 to 2130), excl 5/1 6 (7.9)
84 to 108 (2130 to 2740), excl 3/8 (9.5)
108 to 140 (2740 to 3580), incl 7/16 (11.1)
Plasma Torch-Cut Plate
Specified Diameter, in. (mm) Permissible Variations in Specified Diameter for Thickness Given, in. (mm)
Thickness max, in. (mm) 3/16 to 2 (4.8 to 50.8), excl 2 to 2-3/4 (50.8 to 69.8), incl
Plus Minus Plus Minus
19 to 20 (483 to 508), excl 2-3/4 (69.8) 1/2 (12.7) 0 5/8 (15.9) 0
0 to 22 (508 to 559), excl 2-3/4 (69.8) 1/2 (12.7) 0 5/8 (15.9) 0
2 to 24 (559 to 610), excl 2-1/2 (63.5) 1/2 (12.7) 0 5/8 (15.9) 0
4 to 28 (610 to 711), excl 2-1/4 (57.3) 1/2 (12.7) 0 5/8 (15.9) 0
8 to 32 (711 to 812), excl 2 (50.8) 1/2 (12.7) 0 5/8 (15.9) 0
2 to 34 (812 to 864), excl 1-3/4 (44.5) 1/2 (12.7) 0 ... ...
4 to 38 (864 to 965), excl 1-1/2 (38.1) 1/2 (12.7) 0 ... ...
8 to 40 (965 to 1020), excl 1-1/4 (31.8) 1/2 (12.7) 0 ... ...
0 to 140 (1020 to 3560), incl 2-3/4 (69.8) 1/2 (12.7) 0 5/8 (15.9) 0
Permissible Variations in Width of Sheet and Strip
Specified Thickness, in. (mm) Specified Width, in. (mm) Permissible Variations in Specified Width, in. (m)
Plus Minus
Sheet
Up to 0.250 (6.35) All 0.125 (3.18) 0
Strip
Under 0.075 (1.9) Up to 12 (305), incl 0.007 (0.18) 0.007 (0.18)
Over 12 to 48 (305 to 1219), incl 0.062 (1.6) 0
0.075 to 0.100 (1.9 to 2.5), incl Up to 12 (305), incl 0.009 (0.23) 0.009 (0.23)
Over 12 to 48 (305 to 1219), incl 0.062 (1.6) 0
Over 0.100 to 0.125 (2.5 to 3.2), incl Up to 12 (305), incl 0.012 (0.30) 0.012 (0.30)
Over 12 to 48 (305 to 1219), incl 0.062 (1.6) 0
Over 0.125 to 0.160 (3.2 to 4.1), incl Up to 12 (305), incl 0.016 (0.41) 0.016 (0.41)
Over 12 to 48 (305 to 1219), incl 0.062 (1.6) 0
Over 0.160 to 0.187 (4.1 to 4.7), incl Up to 12 (305), incl 0.020 (0.51) 0.020 (0.51)
Over 12 to 48 (305 to 1219), incl 0.062 (1.6) 0
Over 0.187 to 0.250 (4.7 to 6.4), incl Up to 12 (305), incl 0.062 (1.6) 0.062 (1.6)
Over 12 to 48 (305 to 1219), incl 0.062 (1.6) 0.062 (1.6)
Permissible Variations in Length of Sheared, Plasma Torch-Cut, and Abrasive-Cut Rectangular Plate
Specified Thickness Permissible Variation in Length for Lengths Given, in. (mm)
Up to 60 (1520), incl Over 60 to 96 (1520 to 2440), incl Over 96 to 120 (2440 to 3050), incl Over 120 to 240 (3050 to 6096), incl Over 240 to 360 (6096 to 9144), incl Over 360 to 450 (9144 to 11 430), incl Over 450 to 540 (11 430 to 13 716), incl Over 540 (13 716)
Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus
Inches
Sheared:
3/16 to 5/16, excl 3/16 1/8 1/4 1/8 3/8 1/8 1/2 1/8 5/8 1/8 3/4 1/8 7/8 1/8 ... ...
5/16 to 1/2, excl 3/8 1/8 1/2 1/8 1/2 1/8 1/2 1/8 5/8 1/8 3/4 1/8 7/8 1/8 1 1/8
1/2 to 3/4, excl 1/2 1/8 1/2 1/8 5/8 1/8 5/8 1/8 3/4 1/8 7/8 1/8 1-1/8 1/8 1-3/8 1/8
3/4 to 1, excl 5/8 1/8 5/8 1/8 5/8 1/8 3/4 1/8 7/8 1/8 1-1/8 1/8 1-3/8 1/8 1-5/8 1/8
1 to 1-1/4, incl 3/4 1/8 3/4 1/8 3/4 1/8 7/8 1/8 1-1/8 1/8 1-3/8 1/8 1-5/8 1/8 ... ...
Abrasive-cut:
3/16 to 1-1/4, incl 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8 ... ... ... ...
Over 1-1/4 to 2-3/4, incl 3/16 1/8 3/16 1/8 3/16 1/8 3/16 1/8 3/16 1/8 3/16 1/8 ... ... ... ...
Plasma torch-cut:
3/16 to 2, excl 1/2 0 1/2 0 1/2 0 1/2 0 1/2 0 1/2 0 1/2 0 1/2 0
2 to 2-3/4 5/8 0 5/8 0 5/8 0 5/8 0 5/8 0 5/8 0 5/8 0 5/8 0
Millimetres
Sheared:
4.8 to 7.94, excl 4.8 3.2 6.4 3.2 9.5 3.2 12.7 3.2 15.9 3.2 19.0 3.2 22.2 3.2 ... ...
7.94 to 12.7, excl 9.5 3.2 12.7 3.2 12.7 3.2 12.7 3.2 15.9 3.2 19.0 3.2 22.2 3.2 25.4 3.2
12.7 to 19.0, excl 12.7 3.2 12.7 3.2 15.9 3.2 15.9 3.2 19.0 3.2 22.2 3.2 28.6 3.2 34.9 3.2
19.0 to 25.4, excl 15.9 3.2 15.9 3.2 15.9 3.2 19.0 3.2 22.2 3.2 28.6 3.2 34.9 3.2 41.2 3.2
25.4 to 31.8, incl 19.0 3.2 19.0 3.2 19.0 3.2 22.2 3.2 28.6 3.2 34.9 3.2 41.2 3.2 ... ...
Abrasive-cut:
4.8 to 31.8, incl 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 ... ... ... ...
Over 31.8 to 69.9, incl 4.8 3.2 4.8 3.2 4.8 3.2 4.8 3.2 4.8 3.2 4.8 3.2 ... ... ... ...
Plasma torch-cut:
4.8 to 50.8, excl 12.7 0 12.7 0 12.7 0 12.7 0 12.7 0 12.7 0 12.7 0 12.7 0
50.8 to 69.8, incl 15.9 0 15.9 0 15.9 0 15.9 0 15.9 0 15.9 0 15.9 0 15.9 0

Edge

For Inconel 718 sheets and plates, unless the customer has a special request, the supplier shall supply them in the form of sheared or slit edge.

For Inconel 718 strips, the standard specifies two types of edges for the material: square-edge and round-edge. Strips are delivered with square-edge by default if there is no special request. If the customer requires round-edge, the supplier shall round the edge of the material after the cold rolling of the material is completed.

Flatness

For Inconel 718 plates, the standard additionally specifies the flatness of the material. Please refer to the table below for specific requirements:

Permissible Variations from Flatness of Rectangular, Circular, and Sketch Plates
Specified Thickness Permissible Variations from a Flat Surface for Thickness and Widths Given, in. (mm)
To 48 (1220), excl 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 144 (3050 to 3660), excl 144 (3660) and over
Inches
3/16 to 1/4, excl 3/4 1-1/16 1-1/4 1-3/8 1-5/8 1-5/8 ... ... ...
1/4 to 3/8, excl 11/16 3/4 1-5/16 1-1/8 1-3/8 1-7/16 1-9/16 1-7/8 ...
3/8 to 1/2, excl 1/2 9/16 11/16 3/4 1-5/16 1-1/8 1-1/4 1-7/16 1-3/4
1/2 to 3/4, excl 1/2 9/16 5/8 5/8 1-3/16 1-1/8 1-1/8 1-1/8 1-3/8
3/4 to 1, excl 1/2 9/16 5/8 5/8 3/4 13/16 15/16 1 1-1/8
1 to 2, excl 1/2 9/16 9/16 9/16 11/16 11/16 11/16 3/4 1
2 to 2-1/4, incl 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8
Millimetres
4.8 to 6.4, excl 19.0 27.0 31.8 34.9 41.3 41.3 ... ... ...
6.4 to 9.5, excl 17.5 19.0 23.8 28.6 34.9 36.5 39.7 47.6 ...
9.5 to 12.7 excl 12.7 14.3 17.5 19.0 23.8 28.6 31.8 36.5 44.4
12.7 to 19.0, excl 12.7 14.3 15.9 15.9 20.6 28.6 28.6 28.6 34.9
19.0 to 25.4, excl 12.7 14.3 15.9 15.9 19.0 20.6 23.8 25.4 28.6
25.4 to 50.8, excl 12.7 14.3 14.3 14.3 17.5 17.5 17.5 19.0 25.4
50.8 to 57.2, incl 6.4 7.9 9.5 11.1 12.7 14.3 15.9 19.0 22.2

Certification

Suppliers should issue material test certificate as required before shipment. The content of the certificate should include supplier information, customer information, standards, delivery state, product form, size, chemical composition, mechanical properties, heat number and other special requirements.

Conclusion

ASTM B670 is mainly applicable to the production of Inconel 718 sheet, plate, coil and strip. The standard clearly stipulates the chemical composition and mechanical properties of the material. In addition, the standard additionally specifies the edge and flatness of the material. The supplier shall produce the material according to the standard and provide the corresponding material test certificate before shipment.

We manufacture Inconel 718 material in strict accordance with ASTM B670. If you have needs, please contact us. We will give you the best service.

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