ASTM A564 17-4 PH Stainless Steel Round Bar
Equivalent Grades:UNS S17400, Type 630, EN 1.4542, JIS SUS630
Diameter Range (Round Bar):
Hot Rolled / Forged: 20 mm – 400 mm (0.78" – 15.75")
Cold Drawn / Bright: 3 mm – 100 mm (0.12" – 3.93")
Length & Tolerances Standard length: 3,000 mm – 6,000 mm
Custom cut-to-length available Precision tolerance: H9, H10, H11
Delivery Conditions:(Condition A), H900, H1025, H1050, H1150, H1150D Aging Conditions
Surface Finishes:Centerless Ground, Polished, Peeled, Turned, Black Surface
Inspection & Testing:100% Ultrasonic Testing (UT) according to ASTM A388, PMI Spectrometer Analysis, Hardness Testing
Export records for ASTM A564 17-4 PH Stainless Steel Round Bars
With over 18 years of experience in stainless steel exports, GNEE has successfully supplied products to more than 60 countries and regions-including the USA, Germany, Italy, the Netherlands, Canada, Australia, South Korea, Japan, the UAE, Saudi Arabia, India, Vietnam, Turkey, South Africa, and Brazil. We provide high-performance stainless steel materials for industries such as aerospace, oil and gas, energy equipment, shipbuilding, medical devices, and precision machinery. Our services include the provision of EN 10204 3.1/3.2 material certificates, third-party inspections (SGS/BV/TÜV), PMI material verification, UT ultrasonic testing, hardness testing, tensile testing, and 100% dimensional inspection.
Export ASTM A564 17-4 PH Stainless Steel Round Bars, Dia 25mm × 6000mm, Total in 14,500KGS.
Export ASTM A564 17-4 PH Stainless Steel Bright Bars, Dia 45mm × 3000mm, Total in 11,200KGS.
Export ASTM A564 Grade 630 (17-4 PH) Stainless Steel Bars, Dia 75mm × 6000mm, Total in 25,800KGS.
Export ASTM A564 17-4 PH Stainless Steel Forged Bars, Dia 150mm × 4000mm, Total in 19,400KGS.
Export ASTM A564 UNS S17400 Stainless Steel Round Bars, Dia 55mm × 6000mm, Total in 21,600KGS.
Export ASTM A564 17-4 PH Condition H1025 Stainless Steel Bars, Dia 35mm × 6000mm, Total in 13,700KGS.
What is ASTM A564?
ASTM A564 specification covers hot-rolled and cold-finished age-hardening stainless steel bars. Designed for operating temperatures up to approximately 315°C (600°F), it meets the stringent requirements of demanding working conditions where both high strength and corrosion resistance are essential.
Our ASTM A564 17-4 PH (UNS S17400 / Grade 630) is a precipitation-hardening martensitic stainless steel round bar. Its greatest advantage lies in its ability to achieve mechanical properties far superior to those of 304 and 316 stainless steels while maintaining good corrosion resistance. Following aging treatments such as H900, H1025, or H1150, its tensile strength can exceed 1310 MPa, and its yield strength can surpass 1170 MPa. This performance, significantly higher than 304 and 316 grades, makes it exceptionally suitable for manufacturing high-load shafts, valves, pump shafts, aerospace fasteners, molds, medical devices, and high-precision mechanical components.
GNEE supplies ASTM A564 17-4 PH round steel bars in diameters ranging from Φ6 mm to 450 mm. We offer a wide range of product forms, including hot-rolled, forged, cold-drawn, smooth-turned, peeled, polished, and precision-ground bars. These are available in various heat-treated conditions such as Condition A, H900, H1025, H1075, H1100, and H1150 to meet diverse strength and toughness requirements. Furthermore, we support saw-cutting, CNC precision machining, cut-to-length processing, and export-grade rust-proof packaging, enabling customized production tailored to customer drawings.
Custom 17-4 PH / 630 Stainless Steel Bars
17-4 PH Precision Stainless Steel Bar Specification
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Product |
Stainless Steel Bar |
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Standard |
ASTM A479,ASTM A276,ASTM A484, ASTM A582, |
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Material |
630 2205 2507 |
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Specifications |
Round bar |
Diameter:0.1~500mm |
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Hexagonal bar |
Size: 2mm~100mm |
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Flat bar |
Thickness |
0.3~200mm |
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Width |
1~2500mm |
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Square bar |
Size: 1mm*1mm~800mm*800mm |
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Length |
2m, 5.8m, 6m, or as required. |
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Surface |
Black, peeled, polishing, bright, sand blast, hair line, etc. |
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17-4 PH Stainless Steel Rod Chemical Composition
| Element | C | Cr | Ni | Cu | Nb+Ta | Mn | Si | P≤ | S≤ |
|---|---|---|---|---|---|---|---|---|---|
| 17-4 PH | ≤0.07 | 15.5–17.5 | 3.0–5.0 | 3.0–5.0 | 0.15–0.45 | ≤1.0 | ≤1.0 | 0.04 | 0.03 |
17-4 PH Stainless Steel Rod Mechanical Properties (Ageing Treatment Conditions)
| Heat Treatment Condition | Tensile Strength Rm (MPa / ksi) | Yield Strength Rp0.2 (MPa / ksi) | Elongation A5 (%) | Reduction of Area Z (%) | Brinell Hardness (HBW) | Rockwell Hardness (HRC) |
|---|---|---|---|---|---|---|
| Condition A (Solution Treated) | N/A (Base State) | N/A (Base State) | N/A | N/A | ≤363 | ≤38 |
| Condition H900 (482°C / 900°F Aging) | ≥1310 (≥190) | ≥1170 (≥170) | ≥10 | ≥40 | ≥388 | ≥40 |
| Condition H1025 (552°C / 1025°F Aging) | ≥1070 (≥155) | ≥1000 (≥145) | ≥12 | ≥45 | ≥331 | ≥35 |
| Condition H1050 (566°C / 1050°F Aging) | ≥1000 (≥145) | ≥930 (≥135) | ≥13 | ≥45 | ≥311 | ≥33 |
| Condition H1150 (621°C / 1150°F Aging) | ≥930 (≥135) | ≥725 (≥105) | ≥16 | ≥50 | ≥277 | ≥28 |
| Condition H1150D (Double Aging) | ≥860 (≥125) | ≥725 (≥105) | ≥16 | ≥50 | 255–311 | 24–33 |
17-4 PH Round Bar Weight Calculation
The theoretical weight of 17-4 PH stainless steel round bar can be calculated based on a material density of 7.78 g/cm³ (0.281 lb/in³):
Weight per meter (kg/m) = Diameter (mm)² × 0.006115
Example: Round bar with a diameter of 50 mm:
Weight = 50² × 0.006115 = 15.2875 kg/m
17-4 PH Stainless Steel Rod Application
Mechanical manufacturing: high-strength structural components such as shafts, gears, sleeves, forgings, etc;
Hydraulic/Pneumatic: Cylinder piston rod, valve core, valve components;
Aerospace: aircraft landing gear parts, engine components;
Medical devices: surgical instruments, implants (must meet biocompatibility);
Chemical/Marine: Valves, flanges, and connectors in mildly corrosive environments (avoiding strongly corrosive media);
Electronic devices: precision structural components without magnetic requirements.
Possible alternative grades to 630 stainless steels
| Grade | Reasons for choosing 17/4PH (630) |
| 431 | 431 Has higher toughness than 17/4PH. Better availability in some sizes. |
| 416 | Free-machining martensitic stainless steel - better for repetition machining. Lower cost. |
| 316 | Higher corrosion resistance of 316 to resist more severe environments, but with much lower strength than 17/4PH. |
| 2205 | Much better corrosion resistance than 17/4PH, with a lower strength (but not as low as 316). |
Stainless Steel 17-4PH Round Bars Supplier, Stockist
GNEE Stainless Steel has currently installed over 100 units of various types of machinery and equipment. Key equipment includes a 2,000-ton rapid forging press, heat treatment furnaces, a 10-meter quenching tank, a 500-ton straightening machine, a 6-meter medium-frequency surface quenching machine, CNC horizontal lathes (ranging from 3 to 11 meters), CNC machining centers, a 10-meter deep-hole boring machine, a 10-meter honing machine, and various inspection and testing equipment.
PACKAGING AND SHIPPING
GNEE packages Stainless Steel 17-4PH Round Bars in accordance with international export standards to ensure damage-free delivery. Each bundle is securely strapped with steel bands, wrapped in waterproof plastic film and anti-rust paper, and protected with wooden pallets or fumigated wooden cases for long-distance sea transport. Both ends are fitted with protective caps where required, and every package is clearly labeled with grade, size, heat number, and PO number for full traceability.
FAQ
Q. How does the corrosion resistance of 17-4 PH compare to other grades?
A. In most environments, the corrosion resistance of 17-4 PH is superior to standard 400-series stainless steels (such as 410 or 431) and comparable to 304 stainless steel in many media. However, in certain highly corrosive chemical or marine environments, its pitting resistance is slightly inferior to that of 316L.
Q. What are the advantages of 17-4 PH over 316 stainless steel?
A. Its greatest advantage is strength. The yield strength of 17-4 PH can be more than three times that of 316 stainless steel. If an application requires both corrosion resistance and the ability to withstand extremely high mechanical loads, 17-4 PH is the better choice.
Q. Is 17-4 PH magnetic?
A. Yes, it is magnetic. 17-4 PH is a martensitic precipitation-hardening stainless steel; it exhibits strong magnetism in both the solution-annealed state (Condition A) and various age-hardened states (such as H900), unlike austenitic stainless steels like 304 and 316.
Q. What is the maximum hardness 17-4 PH can achieve?
A. In the H900 condition (aged at 482°C), 17-4 PH reaches its peak hardness-typically between 40 and 47 on the Rockwell C scale (HRC)-with a tensile strength exceeding 1310 MPa.
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