ASTM A1082 Specification

This specification covers high strength stainless steel bolting materials and bolting components for special purpose applications such as pressure vessels. Several grades of precipitation-hardened and duplex (ferritic-austenitic) stainless steels are covered. Selection will depend upon design, service conditions, mechanical properties and characteristics related to the application.

Chemical Composition

UNS DesignationB TypeB Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum Nitrogen Other Elements
Duplex (Ferritic-Austenitic) Grades
S31100 ... 0.06 1.00 0.045 0.030 1.00 25.0-27.0 6.0-7.0 ... ... Ti 0.25
S31260 ... 0.030 1.00 0.030 0.030 0.75 24.0-26.0 5.5-7.5 2.5-3.5 0.10-0.30 Cu 0.20-0.80,
W 0.10-0.50
S31803 ... 0.030 2.00 0.030 0.020 1.00 21.0-23.0 4.5-6.5 2.5-3.5 0.08-0.20 ...
S32101 ... 0.040 4.0-6.0 0.040 0.030 1.00 21.0-22.0 1.35-1.70 0.10-0.80 0.20-0.25 Cu 0.10-0.80
S32202 ... 0.030 2.00 0.040 0.010 1.00 21.5-24.0 1.0-2.80 0.45 0.18-0.26 ...
S32205 2205 0.030 2.00 0.030 0.020 1.00 22.0-23.0 4.5-6.5 3.0-3.5 0.14-0.20 ...
S32304 2304 0.030 2.50 0.040 0.030 1.00 21.5-24.5 3.0-5.5 0.05-0.60 0.05-0.20 Cu 0.05-0.60
832506 0.030 1.00 0.040 0.015 0.90 24.0-26.0 5.5-7.2 3.0-3.5 0.08-2.0 w 0.05-0.30
832550 255 0.040 1.50 0.040 0.030 1.00 24.0-27.0 4.5-6.5 2.9-3.9 0.10-0.25 Cu 1.50-2.50
832750 2507 0.030 1.20 0.035 0.020 0.80 24.0-26.0 6.0-8.0 3.0-5.0 0.24-0.32 Cu 0.50
832760 0.030 1.00 0.030 0.010 1.00 24.0-26.0 6.0-8.0 3.0-4.0 0.20-0.30 Cu 0.50-1.00,
W 0.50-1.00,
%Cr+3.3x%Mo
+16x%N≥40
832906 ... 0.030 0.80-1.50 0.030 0.030 0.50 28.0-30.0 5.8-7.5 1.50-2.60 0.30-0.40 Cu 0.80
832950 ... 0.030 2.00 0.035 0.010 0.60 26.0-29.0 3.5-5.2 1.00-2.50 0.15-0.35 ...
839277 ... 0.025 0.80 0.025 0.002 0.80 24.0-26.0 6.5-8.0 3.0-4.0 0.23-.033 Cu 1.20-2.00,
W 0.80-1.20
Precipitation Hardening Grades
815700 632 0.09 1.00 0.040 0.030 1.00 14.0-16.0 6.5·7.7 2.00-3.00 ... Al  0.75·1.50
817400 630 0.07 1.00 0.040 0.030 1.00 15.0-17.0 3.0·5.0 ... ... Cu 3.0 5.0,
817600 635 0.08 1.00 0.040 0.030 1.00 16.0-17.5 6.0·7.5 ... ... Cb +Ta 0.15·0.45
Al 0.40,
817700 631 0.09 1.00 0.040 0.030 1.00 16.0·18.0 6.5·7.7 ... ... Ti 0.40·1.20
Al  0.75·1.50
835500 634 0.10 0.15 0.50 1.25 0.040 0.030 0.50 15.0·16.0 4.0·5.0 2.5 3.2 0.07 0.13 Cb 0.10 0.50
Note:

A. Maximum or range unless otherwise indicated.
B. See Guide A959/A959M.

Mechanical Properties for PH Grades A

UNS Designation Type Solution TreatmentB,C °F [°C] Mechanical Property Requirements in the Solution Treated Condition
Tensile Strength ksi [MPa] Yield Strength ksi [MPa] Elongation in 2” [50 mm] or 4D, min. % Reduction of Area, min. % HardnessD
Rockwell, maximum Brinell, maximum
S15700 632 ... ... ... ... ... 100 HRB 269
S17400 630 Cool to below 90 [32] ... ... ... ... 38 HRC 363
S17600 635 Air Cool 120 [825] 75 [515] 10 45 32 HRC 302
S17700 631 ... ... ... ... ... 98 HRB 229
S35500 634 Hold at ≤ -100 [-73] for at least 3 hours ... ... ... ... ... 363
Note:

A. Values shown are minimums or ranges unless maximum is indicated.
B. 1900 [1040] ± 25°F [15°C].
C. Quenched in water unless the table specifies another media.
D. Either Rockwell or Brinell testing is permitted unless thickness is below 1⁄2 ” in which case Rockwell is preferred.

Age Hardening Heat Treatment and Mechanical Properties for PH Grades A

Type Condition Suggested Hardening and/or Aging Temperatures, Time at Temperature, and Quench Media °F [°C] B,C,D,E Maximum Thickness inch [mm] inclusive Mechanical Properties
Tensile Strength ksi [MPA] Yield Strength ksi [MPA] Elongation in 2” [50 mm] or 4D % Reduction of Area, % HardnessF Impact Ft-lbf [J]
Rockwell, HRC Brinell
630 H900 900 [480], 1 hour 8 190 [1310] 170 [1170] 10 35 40 388 ...
630 H925 925 [495], 4 hours 8 170 [1170] 155 [1070] 10 38 38 375 5 [6.8]
630 H1025 1025 [550], 4 hours 8 155 [1070] 145 [1000] 12 45 35 331 15 [20]
630 H1075 1075 [580], 4 hours 8 145 [1000] 125 [860] 13 45 32 311 20 [27]
630 H1100 1100 [595], 4 hours 8 140 [965] 115 [795] 14 45 31 302 25 [34]
630 H1150 1150 [620], 4 hours 8 135 [930] 105 [725] 16 50 28 277 30 [41]
630 H1150D 1150 [620] for 4 hrs., air cool plus
1150 [620] for 4 hrs., air cool
8 125 [860] 105 [725] 16 50 24-33 255-311 30 [41]
630 H1150M 1400 [760] for 2 hrs., air cool plus
1150 [620] for 4 hrs., air cool
8 115 [795] 75 [520] 18 55 24 255 55 [75]
631 RH950 1750 [955] for 10 min. to 1 h, rapidly cool to room temperature. Cool within 24 hrs. to -100 ± 10 [-75 ± 5], hold 8 hrs. min. Warm in air to room temperature. Heat to 950 [510] hold 1 h, air cool. 4 185 [1280] 150 [1030] 6 10 41 388 ...
631 TH1050 1400 [760] for 90 min. Cool to 55 ± 5 [15 ± 3] within 1 h, hold 1⁄2 h min., heat to 1050 [565], hold for 90 min., air cool 6 170 [1170] 140 [965] 6 25 38 352 ...
632 RH950 Same as Type 631 4 200 [1380] 175 [1210] 7 25 44 415 ...
632 TH1050 Same as Type 631 6 180 [1240] 160 [1100] 8 25 38 375 ...
634 H1000 1750 [955] for 10 min. to 1 h, water quench. Cool to -100 [75] min., hold 3 hrs. min. Temper at 1000 [540] hold for 3 h min, air cool. ... 170 [1170] 155 [1070] 12 25 37 341 ...
635 H950 950 [510], 1⁄2 h ... 190 [1310] 170 [1170] 8 25 39 363 ...
635 H1000 1000 [540], 1⁄2 h ... 180 [1240] 160 [1100] 8 30 37 352 ...
635 H1050 1050 [565], 1⁄2 h ... 170 [1170] 150 [1035] 10 40 35 331 ...
Note:

A. Values shown are minimums or ranges unless maximum is indicated.
B. ± 25°F [15°C].
C. Temperatures are suggested and may be varied to obtain the required tensile properties.
D. Time refers to the minimum time the material is at temperature and may be extended to obtain required ductility properties.
E. Quenching shall be accomplished using air or gas cooling unless the table specifies another media.
F. Either Rockwell or Brinell testing is permitted unless thickness is below 1⁄2 ” in which case Rockwell is preferred.

Heat Treatment and Mechanical Property Requirements for Duplex Grades A

UNS Designation Solution Temperature, °F [°C] B,C Size Range Mechanical Properties
Tensile Strength, ksi [MPA] Yield Strength, ksi [MPA] Elongation in 2” [50 mm] or 4D % HardnessD
Rockwell, HRC maximum Brinell, maximum
831100 1900 [1040] 90 [620] 65 [450] 20 30 290
831260 1870 to 2010
[1020 to 1100]
100 [690] 70 [485] 20 31 297
831803 1900 [1040] 90 [620] 65 [450] 25 30 290
832101 1870 [1020] 94 [650] 65 [450] 30 30 290
832202 1800 to 1975
[980 to 1080]
94 [650] 65 [450] 30 30 290
832205 1900 [1040] 95 [655] 65 [450] 25 30 290
832304 1800 [980] 90 [620] 65 [450] 18 32 302
832506 1870 - 2050 90[620] 65 [450] 18 32 302
[1020 - 1120]
832550 1900 [1040] 110[760] 80 [550] 15 31 297
832750 1880 - 2060 2 in. and under 116[800] 80 [550] 15 33 310
[1025 - 1125]
>2 in. 110 [760] 75 [515] 15 33 310
832/60 2010 [1100] 109 (/bO] 80 [5b0] 2b 30 290
832900 1750 [955] 90 [620] 70 [485] 15 30 290
832906 1830 to 2100 109 [750] 80 [550] 25 33 310
(1000 to 1150]
Note:

A. Values shown are minimums or ranges unless maximum is indicated.
B. ± 25°F [15°C].
C. Quenched in water.
D. Either Rockwell or Brinell testing is permitted unless thickness is below 1⁄2 ” in which case Rockwell is preferred.