ASTM A453/A453M Grade 651/660/662/665/668 Bolts, Stud Bolts, Nuts & Washers

ASTM A453/ A453M - Standard Specification for High-Temperature Bolting, with Expansion Coefficients Comparable to Austentitic Stainless Steels

This specification covers 5 grades of bolting with twelve classes of yield strength ranging from 50 to 120 ksi [345 to 827 Mpa] for used in high temperature service such as fasteners for pressure bessel and valve flanges. The specification is expressed in both inch-pound units and in SI units. BoltPort primarily stocks and supply A453 Grade 660 Boltings for high temperature service. We stock round bar in Grade 660, Grade 651 & Grade 665 for quick manufacturing these bolts. These bolts are solution annealed and age hardened to provide maximum efficiency in their applications. We offer Rupture Test Facility for sufficient quantity order. ASTM A453M is a metric companion to ASTM A453 including metric sizes stud bolts, hex bolts, socket head cap screws, etc.

We offer precisely made Stud Bolts, Hex Bolts, Heavy Hex Bolts, Socket Head Cap Screws as per ASTM A453 Grade 600, 651, 662, 665 & 668 in various tensile class. We produce these fasteners from 3/8" to 4" in imperial and upto M100 in metric sizes. Larger size bolts can be made to order as per request. We also undertake custom made boltings in A453 as per drawing.

ASTM A453 Bolting Grades and Tensile Class

Grade 660 Class A Class B Class C Class D
Grade 651 Class A Class B
Grade 662 Class A Class B
Grade 665 Class A Class B
Grade 668 Class A Class B

ASTM A453 Grade 651/660/662/665/668 Chemical Composition

Element
Content %
Grade 660
UNS S66286
Grade 651
UNS S63198
Grade 662
UNS S66220
Grade 665
UNS S66545
Grade 668
UNS S66285
Carbon 0.08 max 0.28 - 0.35 0.08 max 0.08 max 0.08 max
Manganese 2.00 max 0.75 - 1.50 0.40 - 1.00 1.25 - 2.00 2.00 max
Phosphorus 0.04 max 0.04 max 0.04 max 0.04 max 0.04 max
Sulfur 0.03 max 0.30 max 0.03 max 0.03 max 0.03 max
Silicon 1.00 max 0.30 - 0.80 0.40 - 1.00 0.10 - 0.80 1.00 max
Nickel 24.00 - 27.00 8.00 - 11.00 24.00 - 28.00 24.00 - 28.00 17.50 - 21.50
Chromium 13.50 - 16.00 18.00 - 21.00 12.00 - 15.00 12.00 - 15.00 13.50 - 16.00
Molybdenum 1.00 - 1.50 1.00 - 1.75 2.00 - 3.50 1.25 - 2.25 1.50 max
Tungsten --- 1.00 - 1.75 --- --- ---
Titanium 1.90 - 2.35 0.10 - 0.35 1.80 - 2.10 2.70 - 3.30 2.20 - 2.80
Columbium* --- 0.25 - 0.60 --- --- ---
Aluminum 0.35 max --- 0.35 max 0.25 max 0.50 max
Vanadium 0.10 - 0.50 --- --- --- 0.50 max
Boron 0.001 - 0.010 --- 0.001 - 0.010 0.01 - 0.07 0.001 - 0.010
Copper --- 0.50 max 0.50 max 0.25 max ---

ASTM A453 Grade 651/660/662/665/668 Mechanical Properties

Grade Class Tensile Strength Yield Strength Elongation
in 4D, min, %
Reduction
of Area, min, %
Brinell
Hardness
Number
Approximate
Rockwell
Hardness, B & C
Ksi Mpa Ksi Mpa min max
Grade 660 A, B and C 130 895 85 585 15 18 248-341 24 HRC 37 HRC
Grade 660 D 130 895 105 725 15 18 248-341 24 HRC 35 HRC
Grade 651 A 100 690 70A
60B
485
415
18 35 217-277 95 HRB 29 HRC
Grade 651 B 95 655 60A
50B
415
345
18 35 212-269 93 HRB 28 HRC
Grade 662 A 130 895 85 585 15 18 248-321 24 HRC 35 HRC
Grade 662 B 125 860 80 550 15 18 248-321 24 HRC 35 HRC
Grade 665 A 170 1170 120 830 12 15 311-388 32 HRC 41 HRC
Grade 665 B 155 1070 120 830 12 15 311-388 32 HRC 41 HRC
Grade 668 A and B 130 895 80 858 15 18 248-321 24 HRC 37 HRC

ASTM A453 Grade 651/660/662/665/668 Heat Treatment Requirements

Grade Class Solution Treatment Hardening Treatment
Grade 660 A 1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool
Grade 660 B 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and liquid quench 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool
Grade 660 C 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and oil quench 1425 +/- 25° F [775 +/- 14°C], hold 16 hr, air cool,
followed by 1200 +/- 25°F [650 +/- 14°C], air cool
Grade 660 D 1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool,
If required to achieve properties, second age:
1200 +/- 25°F [650 +/- 14°C], air cool
Grade 651 A Hot-cold worked at 1200°F [650°C] min with 15% reduction in cross sectional area,
stress relief anneal at 1200°F [650°C] min or 4 hr, min
Grade 651 B Hot-cold worked at 1200°F [650°C] min with 15% reduction in cross sectional area,
stress relief anneal at 1350°F [730°C] min or 4 hr, min
Grade 662 A 1800 +/- 25° F [980 +/- 14°C], hold 2 hr and liquid quench 1350 to 1400° F [730 to 760°C], hold 20 hr, furnace cool to 1200 +/- 25°F [650 +/- 14°C],
hold 20hr, air cool
Grade 662 B 1950 +/- 25° F [1065 +/- 14°C], hold 2 hr and liquid quench 1350 to 1400° F [730 to 760°C], hold 20 hr, furnace cool to 1200 +/- 25°F [650 +/- 14°C],
hold 20hr, air cool
Grade 665 A 1800 +/- 25° F [980 +/- 14°C], hold 3 hr and liquid quench 1350 to 1400° F [730 to 760°C], hold 20 hr, furnace cool to 1200 +/- 25°F [650 +/- 14°C],
hold 20hr, air cool
Grade 665 B 2000 +/- 25° F [1095 +/- 14°C], hold 3 hr and liquid quench 1350 to 1400° F [730 to 760°C], hold 20 hr, furnace cool to 1200 +/- 25°F [650 +/- 14°C],
hold 20hr, air cool
Grade 668 A 1650 +/- 25° F [900 +/- 14°C], hold 2 hr, min and liquid quench 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool
Grade 668 B 1800 +/- 25° F [980 +/- 14°C], hold 1 hr, min and liquid quench 1325 +/- 25° F [720 +/- 14°C], hold 16 hr, air cool

ASTM A453 Grade 651/660/662/665/668 Stress Rupture Requirements

Grade Class Test Temperature Stress, Min Time to Rupture, min, hA Elongation, min, %
°F °C Ksi Mpa
Grade 660 A, B and C 1200 650 56 385 100 5
Grade 651 A and B 1200 650 40 275 100 5
Grade 662 A and B 1200 650 55 380 100 5
Grade 665 A 1200 650 75 515 100 3
Grade 665 B 1200 650 70 485 100 5

The combination bar specimen shall be tested continuously at the temperature and at the minimum stress specified or at a greater stress and shall rupture in a time not less than than specified.

ASTM A453 Grade 651/660/662/665/668 Marking Requirements

Grade Class A Class B Class C Class D
Grade 660 FB 660A FB 660B FB 660C FB 660D NR
Grade 651 FB 651A FB 651B
Grade 662 FB 662A FB 662B
Grade 665 FB 665A FB 665B
Grade 668 FB 668A FB 668B