ASTM A453 Grade 660 stainless steel Fasteners Specification

ASTM A453 Grade 660 stainless steel Fasteners like Heavy Hex Bolts Screws Nuts Washers
ASTM A453 known as an Iron based nickel chromium super alloy with additions of titanium and molybdenum. It is typically a precipitation hardening steel used for high temperature service hence known as cres A286.

ASTM A453 grade 660 Fasteners are referred as high temperature bolting with co-efficient expansion similar to Austenitic Stainless Steel. A453 material specification is achieved by producing A453 steel in Argon oxygen decarburization (AOD) or vacuum Induction Melting Process that is further refined by Vacuum Arc Refining (VAR) or Electro Slag Refining (ESR) used for high nickel alloys like incoloy alloys. Comparable to incoloy, ASTM A453 can be age hardened with both oil quench and liquid quench conditions. Unlike other precipitation hardening steels, this ASTM A453 grade 660 fasteners require Stress Rupture Testing with 100 hours minimum time to rupture. High temperature and low stress applications, good corrosion resistance at high temperatures are some of the most ASTM A453 Stainless Steel Properties. ASTM A453 steel is available in both solution treated condition and age hardened conditions.

ASTM A453 Grade 660 stainless steel Fasteners Properties

Chemical Properties   
CMnPS
0.08 Max2.00 Max0.040 Max0.030 Max
MoNiVTi
1.00-1.5024.0-27.00.10-0.501.90-2.35

Mechanical Properties   
Yeild strengthTensile strengthElongationReduction
MpaMpa%%
minminminmin
5858951518

Heat Treatment   
Solution treated @ 900°C & liquid quenched and Hardened @ 720°C & air cooled

A286 Stainless Steel Properties:

Heat Treatment:
Solution Treatment: Solution Annealing @ 1650 +/- 25 ¡Fahrenheit [900 +/-14 ¡Celsius], hold for 2 hours minimum and liquid quench OR Solution annealing @ 1800 +/- 25 ¡Fahrenheit [980 +/-14 ¡Celsius], hold for 1 hour minimum followed by liquid quenching.

Hardening Treatment: Ageing @ 1325 +/- 25 ¡Fahrenheit [720 +/- 14 ¡Celsius] for 16hours followed by air-cooling.

Additional treatment: Solution annealing @ 900 degrees Celsius results in finer grain size and superior tensile properties at elevated temperatures. To gain Stress rupture requirements, double ageing is referred where hardening @ 1425 +/- 25 ¡Fahrenheit [775 +/- 14 ¡Celsius], hold 16hours, air cool followed by 1200 +/- 25 ¡Fahrenheit [650 +/- 14 ¡Celsius], hold for 6hours followed by air cool. Solution Annealing @980 degrees Celsius results in a slightly coarser grain size with superior creep-rupture properties.

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Equivalent Designation
ASTM/ASMEAISIUNSBritish StandardWerkstoff No.En NameSwedish(SS)JIS(SUS)
a286S 66286HR 51, HR 650 1.4944, 1.4980X6NiCrTiMoV26-1510269, 2399SUS 660
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