ASTM A453 / A453M

This specification2 covers four grades of bolting materials with ten classes of yield strength ranging from 50 to 120 ksi [345 to 827 MPa] for use in high-temperature service such as fasteners for pressure vessel and valve flanges. The material requires special processing and is not intended for general purpose applications. The term “bolting material,” as used in this specification, covers rolled, forged, or hot-extruded bars; bolts, nuts, screws, washers, studs, and stud bolts. Headed bolts and rolled threads may be supplied.Supplementary Requirement S 1 of an optional nature is provided. This shall apply only when specified by the purchaser in the order.This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.

Chemical Properties

Grade Carbon Manganese Phosphorus Sulfur Silicon Nickel Chromium Molybdenum Tungsten Titanium ColumbiumA Aluminum Vanadium Boron Copper
660 0.08 max 2.00 max 0.040 max 0.030 max 1.00 max 24.0–27.0 13.5–16.0 1.00–1.50 ... 1.90–2.35 ... 0.35 max 0.10–0.50 0.001–0.010 ...
651 0.28–0.35 0.75–1.50 0.040 max 0.030 max 0.30–0.80 8.0–11.0 18.0–21.0 1.00–1.75 1.00–1.75 0.10–0.35 0.25–0.60 ... ... ... 0.50 max
662 0.08 max 0.40–1.00 0.040 max 0.030 max 0.40–1.00 24.0–28.0 12.0–15.0 2.0–3.5 ... 1.80–2.10 ... 0.35 max ... 0.001–0.010 0.50 max
665 0.08 max 1.25–2.00 0.040 max 0.030 max 0.10–0.80 24.0–28.0 12.0–15.0 1.25–2.25 ... 2.70–3.3 ... 0.25 max ... 0.01–0.07 0.25 max

Mechanical Properties

Grade Class Tensile Strength,
min, ksi [MPa]		 Yield Strength
(0.2 % Offset), min, ksi [MPa]		 Elongation in
43 Diam,
min, %		 Reduction of
Area, min, %		 Brinell Hardness
Number		 Approximate Rockwell Hardness,
B and C
min max
660 A, B, and C 130 [895] 85 [585] 15 18 248–341 24 HRC 37 HRC
D 130 [895] 105 [725] 15 18 248–321 24 HRC 35 HRC
651 A 100 [690] 70A [485] 60B [415] 18 35 217–277 95 HRB 29 HRC
B 95 [655] 60A [415] 50B [345] 18 35 212–269 93 HRB 28 HRCC
662 A 130 [895] 85 [585] 15 18 248–321 24 HRC 35 HRCC
B 125 [860] 80 [550] 15 18 248–321 24 HRC 35 HRC
665 A 170 [1170] 120 [830] 12 15 311–388 32 HRC 41 HRC
B 155 [1070] 120 [830] 12 15 311–388 32 HRC 41 HRC

Note:
A Material sizes 3 in. [76 mm] and under in diameter.
B Material sizes over 3 in. [76 mm] in diameter.
C Conversion numbers taken from Specification A 193/A 193M, Table number 2 (austenitic steels); others by interpolation.

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