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Everything You need to Know about ASTM B443

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Overview

ASTM B443 specifies the technical requirements for Inconel 625 sheet, plate, coil and strip. Suppliers should strictly follow this standard when producing these materials. In this article, we will detail the noteworthy points and details in ASTM B443. This will help you make better decisions when purchasing and inspecting.

Grades & Chemical Composition

Grades

The ASTM B443 standard covers two materials: nickel-chromium-molybdenum-niobium alloy (Inconel 625, UNS N06625), and nickel-chromium-molybdenum-silicon alloy (UNS N06219). Among them, Inconel 625 is a more commonly used alloy. The elements nickel and chromium give these two alloys excellent oxidation resistance. The molybdenum element ensures the reduction resistance of the material. Therefore, both alloys have good overall corrosion resistance. In Inconel 625, niobium plays a significant role in solid solution strengthening. It gives the alloy a higher strength.

Chemical Composition

Inconel 625 (UNS N06625)

625

Si

C

Al

Ti

Co

Ta

Mo

Fe

Cr

Ni

The supplier shall perform a chemical analysis of the material in accordance with ASTM B880.

Product Properties

Products in ASTM B443

ASTM B443 mainly includes four products: sheet, plate, coil and strip. The main way to distinguish them is size and production process. Generally speaking, the plate is thicker and is often produced by hot rolling. Sheet and strip are thinner and are often produced by cold rolling. Among them, the width of strip is narrower. Coil is a coiled sheet and plate. Its production process is determined by the thickness. The table below defines exactly how the different products differ.

Permissible Variations in Diameter or Distance
Between Parallel Surfaces of Cold-Worked Rod and Bar
Product Thickness, in. (mm)
Hot-rolled plate 3/16 (4.8) and over
Cold-rolled plate 3/16 to 3/8 (4.8 to 9.5), incl
Hot-rolled sheet 0.018 to 0.250 (0.46 to 6.4), incl
Cold-rolled sheet 0.018 to 0.250 (0.46 to 6.4), incl
Cold-rolled strip 0.005 to 0.250 (0.13 to 6.4), incl

Mechanical Properties

Room Temperature Tensile Properties and Heat Treatment
Product Tensile
Strength, min,
ksi (MPa)		 Yield Strength
(0.2 % Offset),
min, ksi (MPa)		 Elongation in 2
in. or 50 mm (or
4D), min, %
Grade I
UNS N06625 (Annealed)
Cold-rolled sheet and strip 120 (827) 60 (414) 30
Hot-rolled sheet and hot-rolled plate up to 2.75 in. (70 mm), incl 110 (758) 55 (379) 30
Cold-rolled plate up to 0.375 in. (9.5 mm), incl 110 (758) 55 (379) 30
Grade II
UNS N06625 (Solution Annealed)
Cold-rolled sheet and strip, hot-rolled sheet,
cold-rolled plate, and hot-rolled plate		 100 (690) 40 (276) 30
All
UNS N06219 (Solution Annealed)
All plate, sheet, and strip 96 (660) 39 (270) 50

Delivery State

Inconel 625 is specified in two states in the standard: Grade I (Annealed) and Grade II (Solution Annealed). If not specified, the supplier shall deliver in Grade I state. Alloys in the Grade II state have better creep properties at high temperatures. Therefore, if your application requires the alloy to operate at high temperatures, delivery in the Grade II condition should be specified with the supplier in advance.

The standard stipulates that all UNS N06219 alloys are delivered in a solution annealed state.

Other Information

Dimension

The standard specifies the tolerances for thickness, width and length of different products in detail. You can refer to the tables below:

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 2 3/4 (51 to 69.8), 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)
Permissible Variations in Thickness of Sheet and Strip
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)
Cold-Rolled
Specified Thickness, in. (mm), incl Widths 12 in. (305 mm) and under, plus and minus
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 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

Flatness

ASTM B443 also specifies flatness tolerances for plates. This requires suppliers to fine-tune equipment during hot rolling.

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
2400), 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 1-1/2 2-1/8 2-1/2 2-3/4 3-1/4 3-1/4 ... ... ...
1/4 to 3/8, excl 1-3/8 1-1/2 1-7/8 2-1/4 2-3/4 2-7/8 3-1/8 3-3/4 ...
3/8 to 1/2, excl 1 1-1/8 1-3/8 1-1/2 1-7/8 2-1/4 2-1/2 2-7/8 3-1/2
1/2 to 3/4, excl 1 1-1/8 1-1/4 1-1/4 1-5/8 2-1/4 2-1/4 2-1/4 2-3/4
3/4 to 1, excl 1 1-1/8 1-1/4 1-1/4 1-1/2 1-5/8 1-7/8 2 2-1/4
1 to 2, excl 1 1-1/8 1-1/8 1-1/8 1-3/8 1-3/8 1-3/8 1-1/2 2
2 to 2-3/4, incl 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-1/2 1-3/4
Millimetres
4.8 to 6.4, excl 38.1 54.0 63.5 69.8 82.6 82.6 ... ... ...
6.4 to 9.5, excl 34.9 38.1 47.6 57.2 69.8 73.0 79.4 95.2 ...
9.5 to 12.7, excl 25.4 28.6 34.9 38.1 47.6 57.2 63.5 73.0 88.9
12.7 to 19.0, excl 25.4 28.6 31.8 31.8 41.3 57.2 57.2 57.2 69.8
19.0 to 25.4, excl 25.4 28.6 31.8 31.8 38.1 41.3 47.6 50.8 57.2
25.4 to 50.8, excl 25.4 28.6 28.6 28.6 34.9 34.9 34.9 38.1 50.8
50.8 to 70.0, incl 12.7 15.9 19.0 22.2 25.4 28.6 31.8 38.1 44.4

Straightness

The edgewise curvature (depth of chord) of flat sheet, strip, and plate shall not exceed 0.05 in. (1.27 mm) multiplied by the length in feet (0.04 mm multiplied by the length in centimeters).

Edges

Sheet and strip shall have sheared or slit edges. Plate shall have sheared or cut (machined, abrasive cut, powder cut, or inert arc cut) edges, as specified.

Squareness

For sheets of all thicknesses, the angle between adjacent sides shall be 90 ± 0.15° (1/16 in. in 24 in., 1.6 mm in 610 mm).

Certification

The supplier shall provide the material test certificate corresponding to the material before delivery. The certificate should include supplier and customer information, product size and delivery state, chemical composition and mechanical properties, size, standard and heat number.

Conclusion

ASTM B443 is mainly applicable to Inconel 625 sheets. The standard stipulates the chemical composition, mechanical properties, and dimensional tolerances of materials. Suppliers shall produce materials in strict accordance with standards.

We can produce Inconel 625 sheet, plate and strip according to the standard of ASTM B443. If you have any needs, you can contact us.

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