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What is ASTM A564 UNS S17400 Bar?
ASTM A564 UNS S17400 is a specification that covers bars made of a precipitation-hardening stainless steel known as 17-4 PH. Let's explore the details of 17-4PH stainless steel bars comprehensively:
ASTM A564 17-4PH Composition:
Chemical Composition: The composition typically includes approximately 17% chromium, 4% nickel, 4% copper, and small amounts of other elements such as manganese, silicon, phosphorus, sulfur, and carbon.
ASTM A564 Type 630 rod Mechanical Properties:
Tensile Strength: ASME SA564 UNS S17400 bars exhibit a tensile strength ranging from 1050 MPa (152 ksi) to 1275 MPa (185 ksi), depending on the heat treatment condition.
- Yield Strength: The yield strength varies between 725 MPa (105 ksi) to 1190 MPa (172 ksi).
- Elongation: Elongation at break typically ranges from 6% to 15%.
- Hardness: The hardness of these bars can reach up to HRC 38 in the H900 condition.
Mechanical Properties Matrix by Condition
| Material Condition | Tensile Strength (Min) | Yield Strength 0.2% Offset (Min) | Elongation in 2" (Min) | Hardness (Rockwell C) |
| Condition A | Not Specified | Not Specified | Not Specified | Max 38 HRC |
| Condition H900 | 190 ksi (1310 MPa) | 170 ksi (1170 MPa) | 10% | Min 40 HRC |
| Condition H1150 | 135 ksi (930 MPa) | 105 ksi (724 MPa) | 16% | Min 28 HRC |
AISI 630 Heat Treatment:
Precipitation Hardening: ASTM A564 UNS S17400 bars undergo a precipitation hardening heat treatment process to achieve the desired mechanical properties. Common heat treatment conditions include H900, H925, H1025, H1075, H1100, H1150, and H1150M, each offering different combinations of strength and toughness.
DIN 1.4542 Stainless Steel Bar Applications:
- Aerospace Components: Due to its high strength-to-weight ratio and corrosion resistance, 17-4PH stainless steel rods bars find applications in aerospace components such as landing gear, structural components, and engine parts.
- Oil and Gas Industry: These bars are used in offshore platforms, valves, and pump shafts where corrosion resistance and strength are critical.
- Medical Devices: The biocompatibility and strength of 17-4 PH stainless steel make it suitable for medical implants and surgical instruments.
- Industrial Equipment: ASTM A564 gr 630 bars are utilized in a wide range of industrial equipment, including shafts, gears, and fasteners, where a combination of strength and corrosion resistance is required.
Commercial Supply Profiles and Dimensional Tolerances
HT PIPE maintains robust, diverse stock lines to fulfill varied structural prints without long production lead times.
Available Shapes: Round Bars, Hexagonal Bars, Square Bars, Flat Bars, and Forged Shafts.
Size Spectrum:
Cold Finished: 2 mm to 100 mm diameter.
Hot Rolled / Forged: 100 mm to over 500 mm diameter.
Surface Condition Profiles: Black finish (as-forged/hot-rolled), Centerless Ground, Turned, Peeled and Polished, or Smooth Cold Drawn.
Dimensional Compliance: ASTM A484 / ASME SA484 standard tolerances.
Why Buy Your UNS S17400 Bars from HT PIPE?
Zhengzhou Huitong Pipeline Equipment Co., Ltd. protects your capital investment and scheduling deadlines through professional, vertically integrated industrial services:
Precision Processing Custom Services: We offer high-accuracy band saw cutting, centerless grinding, and chamfering to deliver finished, ready-to-machine blanks matching your production lengths.
Integrated Logistics & One-Stop Scope: Avoid tracking dozens of suppliers. We deliver matching high-strength heavy plates, forged flanges, and fittings alongside our bar stock packages.
Full Testing Verification Assurance: Every single shipment leaves our warehouse verified by comprehensive EN 10204 3.1 Mill Test Certificates (MTC), non-destructive testing (NDT), ultrasonic flaw detection, and strict positive material identification (PMI).
Request a Technical Pricing Proposal Contact our specialized industrial sales desk today at market@htpipe.com to receive customized pricing structures, verified inventory lead times, and global shipping estimates within 24 business hours.
