ASTM A453 Grade 660 Class A Bolts | UNS S66286 Specification

ASTM A453 Grade 660 Class A Stud Bolts

BS2399, 1.4980, JIS660, 660, S66286, X6NICRTIMOV26-15

ASTM A453 Grade 660 Class A Stud Bolts are Iron Based Super Alloy bolts manufactured from iron-nickel-chromium alloy with additions of molybdenum and titanium. A453 660 Class A Stud Bolts maintain good strength and oxidation resistance at temperatures up to 1300ºF. Torqbolt is a prominent A453 grade 660 Class a stud bolts supplier in India.

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ASTM A453 Grade 660 Class A Bolting Types

Specification Grade UNS No. CLASS Type
ASTM A453 Grade 660 S66286 Class A M1 M2 R1 R2

ASTM A453 Grade 660 Class A Bolts Properties

ASTM A453 Grade 660 Class A Bolts Chemical Requirements

Grade UNS Number Elements C Mn P S Si Ni Cr Mo W Ti Nb A Al V B Cu
ASTM A453
Grade 660
Class A
S66286 Content, % 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 ...
Product Analysis Variation,
Over or Under, %
0.01 over 0.04 0.005 over 0.005 over 0.05 0.2 0.2 0.05 ... 0.05 ... 0.05 over 0.03 0.0004 under
to
0.001 over
...

ASTM A453 Grade 660 Class A Bolts Mechanical Requirements

Grade Class Tensile Strength, min Yield Strength (0.2 % Offset), min Elongation in 4× Diam, min, % Reduction of Area, min, % Brinell Hardness Number Approximate Rockwell Hardness, B and C
ksi MPa ksi MPa min max
ASTM A453 Grade 660 A 130 895 85 585  15 18 248-341 24 HRC 37 HRC

ASTM A453 Grade 660 Class A Stress Rupture Properties

stress-rupture
Grade Class Test Temperature, °F [°C] Stress, min Time to Rupture, min, hA Elongation, min, %
ksi MPa
ASTM A453 Grade 660 A 1200 [650] 56 385 100 5

ASTM A453 Grade 660 Class A Heat Treatment

Annealing & Ageing Cycles

Grade Symbol Class Solution Treatment Hardening Treatment
ASTM A453 Grade 660 A 1650 ± 25 °F [900 ± 14 °C], hold 2 h, min, and liquid quench 1325 ± 25 °F [720 ± 14 °C], hold 16 h, air cool

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