China professional manufacturer of ASTM B564 17-4PH S17400 Hex bolt,Alloy 630 1.4542 Hex Bolt.
Alloy 17-4PH or UNS S17400 or type 630, is a chromium-nickel-copper precipitation-hardening martensitic Stainless Steel with an addition of niobium. 17-4PH is normally supplied in annealed condition,that is Condition A. This Alloy combines high strength with good corrosion resistance. Optimal mechanical properties can be obtained by age hardening heat treatments. 17-4PH can be easily welded and processed machining practices
Alloy 17-4PH UNS-S17400
Also known as AISI Grade 630, stainless steel alloy grade 17-4PH is a precipitation hardening stainless steel which has extremely high strength and hardness, combined with good ductility and toughness. It has excellent corrosion resistance, approaching that of stainless steel grade 304. Designers and engineers often choose the alloy for its high strength, with corrosion resistance superior to most other high strength steels.
Applications of ASTM B564 17-4PH Hex Bolts
- Aerospace: Components like engine parts, fasteners in aircraft, turbines, and exhaust systems.
- Marine: Parts exposed to harsh, corrosive environments such as offshore rigs, shipbuilding, and chemical processing.
- Chemical Processing: Equipment for chemical reactors, pumps, valves, and heat exchangers.
- Power Generation: High-temperature applications in power plants and nuclear facilities.
- Petrochemical: Equipment exposed to corrosive chemicals, such as storage tanks, pipe fittings, and structural components.
ASTM B564
Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes
This specification covers bars and shapes of age-hardening stainless steels. Hot-finished or cold-finished rounds, squares, hexagons, bar shapes, angles, tees, and channels are included. These shapes may be produced by hot rolling, extruding, or forging. Type 631 and 632 stainless steels contain a large amount of ferrite in the microstructure and can have low ductility in forgings and large diameter bars. Material of types other than XM-16, XM-25, and Type 630 shall be furnished in the solution-annealed condition, or in the equalized and oven-tempered condition. Types 630, XM-16, and XM-25 may be furnished in the solution-annealed or age-hardened condition.
Stainless Steel 17-4PH Chemical Composition
| Element | Min (%) | Max (%) |
| Carbon, C | – | 0.07 |
| Manganese, Mn | – | 1 |
| Silicon, Si | – | 1 |
| Sulfur, S | – | 0.03 |
| Phosphorus, P | – | 0.04 |
| Chromium, Cr | 15 | 17.5 |
| Niobium + Tantalum, Nb + Ta | 0.15 | 0.45 |
| Nickel, Ni | 3.0 | 5.0 |
| Copper, Cu | 3.0 | 5.0 |
| Iron, Fe | – | *Balance |
Stainless Steel 17-4PH Hex Bolt Mechanical Properties
| Property | Imperial | Metric |
| Ultimate Tensile Strength | 23,300 psi | 160 MPa |
| Yield Strength (0.02%) | 16,680 psi | 115 MPa |
| Elongation (% in 2’’) | 5% | 5% |
| Rockwell Hardness C | 35 | 35 |
Heat Treatment
Stainless Steel 17-4PH is available in the solution annealed condition at 1900 °F (1038 °C) and then air-cooled to 90 °F (32 °C).
However, additional heat treatments can produce various hardness and toughness levels. The most common treatments are listed in the table below.
| Condition | Temperature [± 15 °F (± 8.4 °C)] | Cooling Method and Duration |
| H 900 | 900 °F (482 °C) | Air cooling for 1 hour |
| H 925 | 925 °F (496 °C) | Air cooling for 4 hours |
| H 1025 | 1025 °F (551 °C) | Air cooling for 4 hours |
| H 1075 | 1075 °F (580 °C) | Air cooling for 4 hours |
| H 1100 | 1100 °F (593 °C) | Air cooling for 4 hours |
| H 1150 | 1150 °F (621 °C) | Air cooling for 4 hours |
| H 1150 + 1150 | 1150 °F (621 °C) followed by 1150 °F (621 °C) |
Air cooling for 4 hours followed by Air cooling for 4 hours |
| H 1150-M | 1400 °F (760 °C) followed by 1150 °F (621 °C) |
Air cooling for 2 hours followed by Air cooling for 4 hours |
General Specifications for ASTM B564 17-4PH Hex Bolt
| Property | Specification |
|---|---|
| Material Grade | 17-4 PH Stainless Steel (ASTM B564),Grade 630 |
| Standard | ASTM B564 (Forged or hot-rolled precipitation-hardening stainless steel for fasteners) |
| Bolt Type | Hex Bolt |
| Size Range | From M6 (1/4″) to M100 (4″) or custom sizes based on application needs. |
| Thread Type | UNF (Unified National Fine), UNC (Unified National Coarse), or Metric threads (depending on specifications). |
| Finish | Plain, PTFE Coated stud bolt |
| Head Type | Hexagonal head, suitable for tightening with a standard wrench or socket. |
| Tensile Strength | Grade 630 (H900): 185,000 psi (1279 MPa) |
Alloy 630 ,17-4PH is a precipitation-hardening martensitic stainless steel that combines high strength and good corrosion resistance. It is commonly used in industries where strength, durability, and resistance to corrosion are critical, such as aerospace, chemical processing, and marine applications.
