ASTM A1082/A1082M Bolting Specification

High Strength Precipitation Hardening and Ferritic and Austenitic Duplex Stainless Steel Bolting for Special Purpose Applications

ASTM A1082/A1082M Hex Bolts, Heavy Hex Bolts, Studs, Socket Head Cap Screws, Threaded Rods

ASTM A1082 / A1082M covers High Strength Precipitation Hardening and Ferritic and Austenitic Duplex Stainless Steel Bolting for Special Purpose Applications such as pressure vessels. Selection will depend upon design, service conditions, mechanical properties and characteristics related to the application. Bars shall be produced in accordance with Specifications A276/A276M, A479/A479M or A564/A564M as applicable. Finish (hot or cold, ground, rough turned, drawn, etc.) shall be at the option of the manufacturer unless otherwise specified in the purchase order or contract.

ASTM A1082/A1082M Chemical Requirements^A

Grades	UNSDesignationB	TypeB	C	Mn	P	S	Si	Cr	Ni	Mo	N	Other Elements
ASTM A1082/A1082M Austenitic Stainless Steel Grades	S31100	. . .	0.06	1.00	0.045	0.030	1.00	25.0-27.0	6.0-7.0	. . .	. . .	Ti 0.25
ASTM A1082/A1082M Super Austenitic Stainless Steel Grades	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
ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades	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
	S32506	. . .	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
	S32550	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
	S32750	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
	S32760	. . .	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
	S32906	. . .	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
	S32950	. . .	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	. . .
ASTM A1082/A1082M Super Austenitic Stainless Steel Grades	S39277	. . .	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
ASTM A1082/A1082M Precipitation Hardening Grades	S15700	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
	S17400	630	0.07	1.00	0.040	0.030	1.00	15.0-17.0	3.0-5.0	. . .	. . .	Cu 3.0-5.0,Cb +Ta 0.15-0.45
	S17600	635	0.08	1.00	0.040	0.030	1.00	16.0-17.5	6.0-7.5	. . .	. . .	Al 0.40,Ti 0.40-1.20
	S17700	631	0.09	1.00	0.040	0.030	1.00	16.0-18.0	6.5-7.7	. . .	. . .	Al 0.75-1.50
	S35500	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
	(A)Maximum or range unless otherwise indicated. (B)See GuideA959/A959M.

ASTM A1082/A1082M Solution Treatment and Mechanical Property Requirements for PH Grades

UNSDesignation	Type	Solution TreatmentB, C°F [°C]	Mechanical Property Requirements in the Solution Treated Condition
			Tensile Strengthksi [MPa]	Yield Strengthksi [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 atleast 3 hours	. . .	. . .	. . .	. . .	. . .	363
(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 below1/2" in which case Rockwell is preferred.

ASTM A1082/A1082M Age Hardening Treatment and Mechanical Property Requirements for PH Grades^A

Type	Condition	Suggested Hardeningand/or AgingTemperatures, Timeat Temperature,and Quench Media°F [°C]B,C,D,E	Maximum Thickness inch [mm] inclusive	Mechanical Properties
				TensileStrength ksi [MPA]	YieldStrengthksi [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	h4025	1025 [550], 4 hours	8	155 [1070]	145 [1000]	12	45	35	331	15 [20]
630	h4075	1075 [580], 4 hours	8	145 [1000]	125 [860]	13	45	32	311	20 [27]
630	h4100	1100 [595], 4 hours	8	140 [965]	115 [795]	14	45	31	302	25 [34]
630	h4150	1150 [620], 4 hours	8	135 [930]	105 [725]	16	50	28	277	30 [41]
630	h4150D	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	h4150M	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	Th4050	1400 [760] for 90 min. Cool to 55 ± 5 [15 ± 3] within 1 h, hold1/2h 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	Th4050	Same as Type 631	6	180 [1240]	160 [1100]	8	25	38	375	. . .
634	h4000	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],1/2h	. . .	190 [1310]	170 [1170]	8	25	39	363	. . .
635	h4000	1000 [540],1/2h	. . .	180 [1240]	160 [1100]	8	30	37	352	. . .
635	h4050	1050 [565],1/2h	. . .	170 [1170]	150 [1035]	10	40	35	331	. . .
(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 below1/2" in which case Rockwell is preferred.

ASTM A1082/A1082M Heat Treatment and Mechanical Property Requirements for Duplex Grades^A

UNSDesignation	Solution Temperature,°F [°C]B,C	Size Range	Mechanical Properties
			TensileStrength,ksi [MPA]	YieldStrength,ksi [MPA]	Elongation in 2"[50 mm] or 4D%	HardnessD
						Rockwell, HRC maximum	Brinell,maximum
S31100	1900 [1040]	. . .	90 [620]	65 [450]	20	30	290
ASTM A1082/A1082M Super Austenitic Stainless Steel Grades	S31260	1870 to 2010 [1020 to 1100]	. . .	100 [690]	70 [485]	20	31	297
ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades	S31803	1900 [1040]	. . .	90 [620]	65 [450]	25	30	290
	S32101	1870 [1020]	. . .	94 [650]	65 [450]	30	30	290
	S32202	1800 to 1975 [980 to 1080]	. . .	94 [650]	65 [450]	30	30	290
	S32205	1900 [1040]	. . .	95 [655]	65 [450]	25	30	290
	S32304	1800 [980]	. . .	90 [620]	65 [450]	18	32	302
	S32506	1870 - 2050 [1020 - 1120]	. . .	90[620]	65 [450]	18	32	302
	S32550	1900 [1040]	. . .	110[760]	80 [550]	15	31	297
	S32750	1880 - 2060 [1025 - 1125]	2 in. and under	116[800]	80 [550]	15	33	310
			>2 in.	110 [760]	75 [515]	15	33	310
	S32760	2010 [1100]	. . .	109 [750]	80 [550]	25	30	290
	S32900	1750 [955]	. . .	90 [620]	70 [485]	15	30	290
S32906	1830 to 2100 [1000 to 1150]	. . .	109 [750]	80 [550]	25	33	310
(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 below1/2" in which case Rockwell is preferred.

ASTM A1082/A1082M Markings

Grades	UNS Designation	Type	Condition	Grade Symbol
ASTM A1082/A1082M Austenitic Stainless Steel Grades	S31100	. . .	. . .	TB 31100
ASTM A1082/A1082M Super Austenitic Stainless Steel Grades	S31260	. . .	. . .	TB 31260
ASTM A1082/A1082M Duplex (Ferritic-Austenitic) Grades	S31803	. . .	. . .	TB 31803
	S32101	. . .	. . .	TB 32101
	S32202	. . .	. . .	TB 32202
	S32205	2205	. . .	TB 32205
	S32304	2304	. . .	TB 32304
	S32506	. . .	. . .	TB 32506
	S32550	255	. . .	TB 32550
	S32750	2507	. . .	TB 32750
	S32760	. . .	. . .	TB 32760
	S32900	. . .	. . .	. . .
	S32906	. . .	. . .	TB 32906
ASTM A1082/A1082M Precipitation Hardening Grades	S15700	632	. . .	TB 157
	S15700	632	RH95	TB 157A
	S15700	632	Th4050	TB 157B
	S17400	630	. . .	TB 174
	S17400	630	H900	TB 174A
	S17400	630	H925	TB 174B
	S17400	630	h4025	TB 174C
	S17400	630	h4075	TB 174D
	S17400	630	h4100	174E
	S17400	630	h4150	TB 174G
	S17400	630	h4150D	TB 174H
	S17400	630	h4150M	174J
	S17600	635	. . .	TB 176
	S17600	635	H950	TB 176A
	S17600	635	h4000	TB 176B
	S17600	635	h4050	TB 176C
	S17700	631	. . .	TB 177
	S17700	631	RH95	TB 177A
	S17700	631	Th4050	TB 177B
	S35500	634	. . .	TB 355
	S35500	634	h4000	TB 355A

ASTM A1082/A1082M Supplementary Requirements

S1 Charpy Impact Tests

This requirement evaluates a material's toughness by measuring the energy it absorbs during fracture under high-speed loading. It is essential for determining the material's resistance to brittle fracture, particularly in extreme environments or sub-zero temperatures.

S2 Product Marking

S2 provides additional guidelines for permanent product identification beyond standard requirements. These markings, which must be raised or indented, include specific grade symbols that reflect the material's thermal condition, such as "174A" for the H900 aged condition of UNS S17400.

S3 Stress Relieving

This requirement involves a thermal treatment process designed to reduce internal residual stresses caused by manufacturing operations like welding, machining, or cold working. The material is heated to a specific temperature below its critical point and then subjected to controlled cooling to improve dimensional stability.

S4 Non-Destructive Inspection

S4 mandates the use of inspection methods that do not damage the component, such as magnetic particle (MT), liquid penetrant (PT), or ultrasonic testing (UT). These techniques are used to detect surface or internal defects, such as cracks or inclusions, which could compromise structural integrity.

S5 Proof Load Testing

This test verifies the mechanical integrity of bolting components by applying a specific tensile load that the sample must withstand without permanent deformation. It ensures the fastener meets its rated strength capacity and validates the manufacturing and heat-treatment processes.

S6 Cross-Sectional Hardness Testing on Nuts

S6 requires hardness testing across a transverse cross-section of a nut to ensure material consistency from the thread roots to the core. This is often used as a substitute for proof load testing on nuts larger than 2.5 inches in diameter, where testing equipment capacity might be limited.

Related Specifications

• ASTM A276
• ASTM A479
• ASTM A453/A453M
• ASTM A564
• ASTM B637
• ASTM A638
• ASTM A693
• ASTM A1014/A1014M
• ASTM F738
• ASTM F2281
• AS 7467
• ISO 3506-1

Surface Treatments

• Xylan 1070 / 1014 / 1400 / 1424
• Xylar 2 / 101
• Geomet 321 / 500 / 720
• SermaGard 1105 / 1280
• Dacromet 320 / 500
• TakeCoat 1000 Ceramic
• Delta Tone/Seal
• Magnigard
• MolyKote
• Sherardized
• Zinc-Cobalt (ASTM B840)
• Zinc-Nickel (ASTM B841)

Certifications

• ISO 9001 - 2015 Certified
• PED 2014/68/EC
• NACE MR0175/ISO 15156-2
• NORSOK M-650
• DFAR
• MERKBLATT AD 2000 W2/W7/W10

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