Related Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
ASTM A1082/A1082M Grade S17600 | 17-6 PH Stainless Steel
High-toughness precipitation hardening steel for critical aerospace applications
Grade S17600 (UNS S17600) is a precipitation hardening martensitic stainless steel, designated as 17-6 PH, containing 17% chromium and 6% nickel with molybdenum additions that enable age hardening to achieve high strength levels combined with superior toughness and corrosion resistance compared to 17-4 PH in demanding environments. This advanced PH grade is utilized in aerospace structural components, landing gear parts, high-performance fasteners, and critical mechanical assemblies requiring excellent strength, fracture toughness, and resistance to stress corrosion cracking. S17600 offers improved corrosion resistance over standard 17-4 PH due to its molybdenum content, making it suitable for marine and offshore applications where strength and durability are paramount. The material can be heat treated to various strength levels while maintaining excellent dimensional stability.
ASTM A1082/A1082M Grade S17600 Chemical Composition
| Grades | UNS Designation | Type | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other ElementsB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A1082/A1082M Precipitation Hardening Grades | 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 |
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ASTM A1082/A1082M Grade S17600 Solution Treatment
| UNS Designation | Type | Solution Treatment | Tensile Strength ksi [MPa] | Yield Strength ksi [MPa] | Elongation in 2" [50 mm] or 4D % | Reduction of Area, % | Rockwell, max | Brinell max |
|---|---|---|---|---|---|---|---|---|
| S17600 | 635 | Air Cool | 120 [825] | 75 [515] | 10 | 45 | 32 HRC | 302 |
ASTM A1082/A1082M Grade S17600 Age Hardening Treatment
| Type | Condition | Suggested Hardening and/or Aging Temperatures, Time at Temperature, and Quench Media °F [°C] | Tensile Strength ksi [MPA] | Yield Strength ksi [MPA] | Elongation in 2" [50 mm] or 4D % | Reduction of Area, % | Rockwell, HRC | Brinell |
|---|---|---|---|---|---|---|---|---|
| 635 | H950 | 950 [510], 1/2 h | 190 [1310] | 170 [1170] | 8 | 25 | 39 | 363 |
| 635 | h4000 | 1000 [540], 1/2 h | 180 [1240] | 160 [1100] | 8 | 30 | 37 | 352 |
| 635 | h4050 | 1050 [565], 1/2 h | 170 [1170] | 150 [1035] | 10 | 40 | 35 | 331 |
ASTM A1082/A1082M Markings
| UNS Designation | Type | Condition | Grade Symbol |
|---|---|---|---|
| S17600 | 635 | . . . | TB 176 |
| S17600 | 635 | H950 | TB 176A |
| S17600 | 635 | h4000 | TB 176B |
| S17600 | 635 | h4050 | TB 176C |
Frequently Asked Questions
What is 17-6 PH (S17600)?
17-6 PH (S17600) is a stainless steel grade covered under ASTM A1082/A1082M for high-strength bolting in special-purpose applications such as pressure vessels. UNS designation S17600. Available as bolts, studs, screws and nuts manufactured by TorqBolt for global oil/gas/nuclear/power/marine sectors.
What are the mechanical properties of 17-6 PH (S17600) per ASTM A1082?
Mechanical property requirements for S17600 are defined in ASTM A1082 Table 2 (PH grade solution treatment) or Table 4 (duplex annealed condition). Properties vary by treatment condition - refer to the bolting specification for the H-condition (PH) or annealed yield/tensile/elongation/hardness requirements applicable to your order.
Is 17-6 PH (S17600) suitable for sour service (NACE MR0175)?
Refer to NACE MR0175 / ISO 15156 Tables A.16-A.19. Most A1082 duplex grades are permitted at ≤28 HRC; PH grades require condition-specific qualification (typically H1150 for 17-4 PH at 28 HRC). TorqBolt supplies sour-service certified product on request with full PMI + hardness traceability.
What ASME / ISO dimensional standards can 17-6 PH (S17600) be supplied to?
This grade is available across the full ASME and ISO bolting dimensional standards covered on this site - ASME B18.2.1 (hex bolts, hex cap screws, lag screws), B18.2.2 (hex nuts, square nuts, lock nuts), B18.3 (socket head cap screws), B18.31.2 (clamping studs), B16.5 (flange stud bolts), ISO 4032 / 4033 / 4035 (metric nuts), and metric B18.2.3.xM / B18.2.4.xM series.
References & Standards
- ASTM A1082 / A1082M - Standard Specification for High-Strength Precipitation-Hardening and Duplex Stainless Steel Bolting for Special-Purpose Applications (current edition 2016, active)
- ASTM A962 / A962M - General Requirements for Special-Purpose Bolting Materials
- ASTM A370 - Mechanical Testing of Steel Products
- NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum & natural gas industries
- ASME B18 series - Dimensional standards for bolts, screws, nuts, studs
- ISO 4032 / 4033 / 4035 - Metric hexagon nut dimensional standards
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