ASTM A638 Grade 660 stainless steel Fasteners Specification

ASTM A638 Grade 660 stainless steel Fasteners like Heavy Hex Bolts Screws Nuts Washers
ASTM A638 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 A638 grade 660 Fasteners are referred as high temperature bolting with co-efficient expansion similar to Austenitic Stainless Steel. ASTM A638 material specification is achieved by producing ASTM A638 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 A638 can be age hardened with both oil quench and liquid quench conditions. Unlike other precipitation hardening steels, this ASTM A638 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 A638 Stainless Steel Properties. ASTM A638 steel is available in both solution treated condition and age hardened conditions.

ASTM A638 Grade 660 stainless steel Fasteners Properties

Chemical Properties     
CMnPSSiCr
0.08 Max2.00 Max0.040 Max0.030 Max1.0 Max13.5-16.0
MoNiVTiAlB
1.00-1.5024.0-27.00.10-0.501.90-2.350.35 Max0.001-0.010

Mechanical Properties      
Yeild strengthTensile strengthElongationReductionHardness
MpaMpa%%BHNHRBHRC
minminminminminmax
5858951518248-3419937

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.


ASTM A453 Chemical Properties

ELEMENT
Grade 660
Grade 651
Grade 662
Grade 665
Grade 668
%
%
%
%
%
Carbon
0.08 max
0.28-0.35
0.08 max
0.08 max
0.08 max
Manganese
2.00 max
0.75-1.5
0.40-1.00
1.25-2.00
2.00 max
Phosphorus, max
0.040 max
0.040 max
0.040 max
0.040 max
0.040 max
Sulfur, max
0.030 max
0.030 max
0.030 max
0.030 max
0.030 max
Silicon
1.00 max
0.30-0.80
0.40-1.00
0.1-0.80
1.00 max
Nickel
24.0-27.0
8.0-11.0
24.0-28.0
24.0-28.0
17.5-21.5
Chromium
13.5-16.0
18.0-21.0
12.0-15.0
12.0-15.0
13.5-16.0
Molybdenum
1.00-1.50
1.00-1.75
2.0-3.50
1.25-2.25
1.50 max
Tungsten
É
1.00-1.75
É
É
É
Titanium
1.9-2.35
0.1-0.35
1.80-2.10
2.70-3.30
2.20-2.80
Columbium *
É
0.25-0.6
É
É
É
Aluminum
0.35 max
0.35 max
0.25 max
0.50 max
Vanadium
0.10-0.50
É
É
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
É

ASTM A453 Mechanical Properties

Size
Class
Tensile, Mpa
Yield, Mpa
Elong. %, min
RA %, min
Grade 660
A, B , & C
895 min
585 min
15
18
D
895 min
725 min
15
18
Grade 651
A
690 min
485 min
18
35
415 min
B
655 min
415 min
18
35
345 min
Grade 662
A
895 min
585 min
15
18
B
860 min
550 min
15
18
Grade 665
A
1170 min
830 min
12
15
B
1070 min
830 min
12
15
Grade 665
A & B
895 min
858 min
15
18

ASTM A453 Heat Treatment

GradeClassSolutiona TreatmentHardening Treatment
660A 1650 +/- 25 ¡F [900 +/-14 ¡C], hold 2 h, min and liquid quench1325 +/- 25 ¡F [720 +/- 14 ¡C] 16h, air cool
B1800 +/- 25 ¡F [980 +/-14 ¡C], hold 1 h, min and liquid quench1325 +/- 25 ¡F [720 +/- 14 ¡C] 16h, air cool
C1800 +/- 25 ¡F [980 +/-14 ¡C], hold 1 h, min and oil quench1425 +/- 25 ¡F [775 +/- 14 ¡C] hold 16h, air cool followed by 1200 +/- 25 ¡F [650 +/- 14 ¡C], hold 16h, air cool
D1650 +/- 25 ¡F [900 +/-14 ¡C], hold 2 h, min and liquid quench OR1325 +/- 25 ¡F [720 +/- 14 ¡C] hold 16h, air cool followed by 1200 +/- 25 ¡F [650 +/- 14 ¡C], hold 16h, air coolif neccessary to achieve properties, second age : 1200 +/- 25 ¡F [650 +/- 14 ¡C] hold 16h, air cool
1800 +/- 25 ¡F [980 +/-14 ¡C], hold 1 h, min and liquid quench
651Ahot-cold worked at 1200 ¡F[650] min with 15% min reduction in cross sectional area, stress-relief anneal at 1200 ¡F [650 ¡C] min or 4h, min
Bhot-cold worked at 1200 ¡F[650] min with 15% min reduction in cross sectional area, stress-relief anneal at 1350 ¡F [730 ¡C] min or 4h, min
662A1800 +/- 25 ¡F [980 +/-14 ¡C], hold 1 h, min and liquid quench1350 to 1400 ¡F [730 to 760 ¡C], hold 20h, furnace cool to 1200 +/- 25 ¡F [650 +/- 14 ¡C], hold 20h, air cool
B1950 +/- 25 ¡F [1065 +/-14 ¡C], hold 2 h, min and liquid quench1350 to 1400 ¡F [730 to 760 ¡C], hold 20h, furnace cool to 1200 +/- 25 ¡F [650 +/- 14 ¡C], hold 20h, air cool
665A1800 +/- 25 ¡F [980 +/-14 ¡C], hold 3 h, min and liquid quench1350 to 1400 ¡F [730 to 760 ¡C], hold 20h, furnace cool to 1200 +/- 25 ¡F [650 +/- 14 ¡C], hold 20h, air cool
B2000 +/- 25 ¡F [1095 +/-14 ¡C], hold 3 h, min and liquid quench1350 to 1400 ¡F [730 to 760 ¡C], hold 20h, furnace cool to 1200 +/- 25 ¡F [650 +/- 14 ¡C], hold 20h, air cool
668A 1650 +/- 25 ¡F [900 +/-14 ¡C], hold 2 h, min and liquid quench1325 +/- 25 ¡F [720 +/- 14 ¡C] 16h, air cool
B1800 +/- 25 ¡F [980 +/-14 ¡C], hold 1 h, min and liquid quench1325 +/- 25 ¡F [720 +/- 14 ¡C] 16h, air cool

ASTM A453 Stress Rupture Properties

GradeClassTest TemperatureStress, MinTime to RuptureElongation
Deg F [ Deg C ]KsiMpaMin, h*Min %
660A, B & C1200 [650]563851005
651A & B1200 [650]402751005
662A & B1200 [650]553801005
665A1200 [650]755151003
B1200 [650]704851005
  • AMS 5726
  • AMS 5731
  • AMS 5732
  • AMS 5734
  • AMS 5735
  • AMS 5736
  • AMS 5737
  • AMS 5853
  • AMS 5895
  • NACE MR-0175 ,
  • Cameron MS-003030
  • Fairchild MS 301
  • 314 Elliott Turbine MS 618
  • Weatherford WS-881
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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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Cold Forged Fasteners, Hot Forged Fastener, C-Machined Components / Fasteners, CNC Machined Components / Fasteners, Custom Machined Components / Fasteners, Threaded Components / Fasteners, Non-Threaded Components / Fasteners, Bar Stock Machined Components / Fasteners.

Metric Range from M1.0 to M100 and Imperial Range from 1/16 inch to 4 inch.

Coarse, Fine, UNC, UNF, UN, BSW, Acme Threads with Half Thread, Full Thread & Double End Thread Configuration.

Hexagon Bolts

  • ANSI B18.2.1
  • ANSI B18.2.3.1M
  • DIN 931
  • DIN 933
  • BS 1768
  • UNI 5731
  • UNI 5737
  • UNI 5739
  • ISO 4014
  • ISO 4017
  • BS 1769
  • BS 3692

Socket/Slotted Set Screws

  • DIN 913
  • DIN 914
  • DIN 915
  • DIN 916
  • DIN 551
  • DIN 553
  • DIN 438
  • BS 4168

Socket/Slotted Countersunk Screws

  • DIN 963
  • DIN 7991
  • BS 4168
  • BS 1981
  • BS 483
  • BS 2470

Socket Cap Screws

  • ANSI B18.3
  • B18.3.1M
  • DIN 912
  • DIN 6912
  • DIN 7984
  • ANSI B18.3
  • ISO 4762
  • UNI 5931
  • BS 2470
  • BS 4168

Stud Bolts

  • ASME B18.2.1
  • DIN 976
  • DIN 938
  • DIN 939
  • DIN 2510
  • BS 4439
  • BS 2693
  • BS4882

Nuts

  • ANSI B18.2.2
  • ANSI B18.2.4.6M
  • DIN 934
  • DIN 936
  • BS 1768
  • BS 1769
  • BS 1083
  • BS 3692
  • ISO 4032
  • ISO 4033
  • ISO 4035
  • UNI 5587
  • UNI 5588
  • UNI 5589

Washers

  • ASME B18.22.1
  • ASTM F436
  • ISO 7089
  • DIN 125
  • DIN 9021
  • BS 4320
  • BS 3410
  • DIN 127
  • BS 4464
  • BS 1802
  • UNI 6952

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