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 S17400 | 17-4 PH Stainless Steel
Most widely used precipitation hardening steel combining strength and corrosion resistance
Grade S17400 (UNS S17400) is the most popular precipitation hardening martensitic stainless steel, widely known as 17-4 PH or ASTM A1082/A1082M F6, containing 17% chromium and 4% nickel with copper additions that enable age hardening to achieve high strength levels up to 200 ksi while maintaining excellent corrosion resistance superior to 410 or 420 martensitic grades. This versatile PH grade is extensively used in aerospace components, oil and gas valves, pump shafts, chemical processing equipment, nuclear reactor components, and general engineering applications requiring high strength combined with good corrosion resistance in atmospheric and mildly corrosive environments. S17400 can be machined and fabricated in solution-annealed condition (Condition A), then precipitation hardened to various strength levels through heat treatment, offering design flexibility and excellent mechanical properties up to 600°F (316°C).
ASTM A1082/A1082M Grade S17400 Chemical Composition
| Grades | UNS Designation | Type | C | Mn | P | S | Si | Cr | Ni | Mo | N | Other ElementsB |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A1082/A1082M Precipitation Hardening Grades | 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 |
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ASTM A1082/A1082M Grade S17400 Solution Treatment
| UNS Designation | Type | Solution Treatment °F [°C] | Rockwell, HRC, max | Brinell max |
|---|---|---|---|---|
| S17400 | 630 | Cool to below 90 [32] | 38 HRC | 363 |
ASTM A1082/A1082M Grade S17400 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 |
|---|---|---|---|---|---|---|---|---|
| 630 | H900 | 900 [480], 1 hour | 190 [1310] | 170 [1170] | 10 | 35 | 40 | 388 |
| 630 | H925 | 925 [495], 4 hours | 170 [1170] | 155 [1070] | 10 | 38 | 38 | 375 |
| 630 | h4025 | 1025 [550], 4 hours | 155 [1070] | 145 [1000] | 12 | 45 | 35 | 331 |
| 630 | h4075 | 1075 [580], 4 hours | 145 [1000] | 125 [860] | 13 | 45 | 32 | 311 |
| 630 | h4100 | 1100 [595], 4 hours | 140 [965] | 115 [795] | 14 | 45 | 31 | 302 |
| 630 | h4150 | 1150 [620], 4 hours | 135 [930] | 105 [725] | 16 | 50 | 28 | 277 |
| 630 | h4150D | 1150 [620] for 4 hrs., air cool plus 1150 [620] for 4 hrs., air cool | 125 [860] | 105 [725] | 16 | 50 | 24-33 | 255-311 |
| 630 | h4150M | 1400 [760] for 2 hrs., air cool plus 1150 [620] for 4 hrs., air cool | 115 [795] | 75 [520] | 18 | 55 | 24 max | 255 max |
ASTM A1082/A1082M Markings
| UNS Designation | Type | Condition | Grade Symbol |
|---|---|---|---|
| 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 | TB 174E |
| S17400 | 630 | h4150 | TB 174G |
| S17400 | 630 | h4150D | TB 174H |
| S17400 | 630 | h4150M | TB 174J |
Frequently Asked Questions
What is 17-4 PH (S17400)?
17-4 PH (S17400) is a stainless steel grade covered under ASTM A1082/A1082M for high-strength bolting in special-purpose applications such as pressure vessels. UNS designation S17400. Available as bolts, studs, screws and nuts manufactured by TorqBolt for global oil/gas/nuclear/power/marine sectors.
What are the mechanical properties of 17-4 PH (S17400) per ASTM A1082?
Mechanical property requirements for S17400 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 17-4 PH (S17400) 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 17-4 PH (S17400) 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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