What is ASTM A564 UNS S17400 Bar?

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.

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.

ASTM A564 ASME SA 564 Standards and Testing:

• ASTM A564: This specification outlines the requirements for hot-finished or cold-finished bars made of alloy 17-4 PH stainless steel.
• UNS S17400: This is the Unified Numbering System designation for 1.4562 material, indicating its chemical composition and properties.
• Testing: Bars produced under ASTM A564 undergo various tests such as tensile testing, hardness testing, and chemical analysis to ensure compliance with the specified requirements.

In conclusion, type 630 bars are precipitation-hardening stainless steel bars known for their exceptional combination of mechanical properties, corrosion resistance, and versatility, making them suitable for a wide range of demanding applications across various industries.