17-4 PH Stainless Steel H1025 Round Bar

What Is 17-4 PH H1025 Stainless Steel Round Bar?

17-4 PH is a copper-bearing martensitic precipitation-hardening stainless steel. The H1025 condition is achieved through solution annealing at approximately 1040°C, followed by precipitation aging at 552°C (1025°F) for 4 hours. This heat treatment promotes the precipitation of fine copper-rich phases within the martensitic matrix, helping achieve stable and uniform mechanical properties throughout the bar cross-section.

According to ASTM A564, 17-4 PH stainless steel round bars in the H1025 condition have a minimum tensile strength of ≥1070 MPa, a minimum 0.2% yield strength of ≥1000 MPa, elongation of ≥12%, and a typical hardness range of 34–42 HRC. Compared with the H900 condition, H1025 sacrifices approximately 18% of peak yield strength while offering improved impact toughness and resistance to stress corrosion cracking. Therefore, H1025 is often a preferred heat treatment condition for components subjected to cyclic loading, such as rotating shafts, valve internals and structural parts. In atmospheric, freshwater, mildly acidic and salt-spray environments, its corrosion resistance is suitable for many applications, although actual performance depends on environmental conditions and should not be assumed equivalent to 304 stainless steel in every service environment.

17-4 PH H1025 stainless steel round bars Suppliers

GNEE supplies ASTM A564 17-4 PH H1025 stainless steel round bars in various surface conditions, including hot-rolled black, peeled, turned and precision-ground finishes. Available diameters range from 8 mm to 300 mm, with standard lengths of 3–6 meters and custom cut-to-length services available upon request. We can also manufacture forged discs, stepped shafts and rectangular-section components according to customer drawings. Aging heat treatment can be completed in-house, or we can supply Condition A solution-annealed material for customers who prefer to perform the final aging treatment after machining.

17-4PH stainless steel black bar

17-4PH Stainless Steel Forgings

Each batch is supplied with a fully traceable EN 10204 3.1 Material Test Certificate (MTC). We can also facilitate third-party inspections by organizations such as SGS, BV, or TÜV to meet project tender requirements.

Chemical Composition of 17-4 PH Stainless Steel bar (ASTM A564 Type 630)

Mechanical Properties of 17-4 PH Stainless Steel H1025 (Room Temperature)

Heat Treatment Procedure (Condition H1025)

Typical Surface Finishes / Delivery Conditions

17-4 PH Stainless Steel Round Bar price per kg

The price of 17-4 PH stainless steel round bar typically ranges from US $3.00 to $8.50 per kg ($3,000 to $8,500 per ton), depending on the diameter, length, surface finish, and order quantity.

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Quality Inspection

Every production batch undergoes mandatory inspection per ASTM A564: spectroscopic chemical analysis, room-temperature tensile test, Brinell / Rockwell hardness verification, ultrasonic testing for internal soundness on critical sizes, and PMI positive material identification. Supplementary tests available for project orders include Charpy impact testing, intergranular corrosion evaluation, salt spray test and grain size assessment.

 

 

 

Brinell/Rockwell Hardness Testing

Brinell/Rockwell Hardness Testing

 

Lead time and packaging:

Standard hot-rolled and solution-annealed stock items can be shipped within 8–14 business days; bars that have undergone pre-aging (H1025 condition) and subsequent peeling or grinding require 15–25 business days. Bars are protected with end caps, wrapped in anti-rust paper, and secured with steel strapping. For ocean freight, they are packed on fumigated wooden pallets or in wooden crates.
Each package is clearly marked with the steel grade, heat-treatment condition, heat number, diameter, and the ASTM A564 standard, ensuring full traceability upon receipt.

FAQ

Q1: What Is the Difference Between 17-4 PH H1025 and H900 Round Bars?

A: The H900 condition undergoes precipitation aging at a lower temperature, resulting in extremely high strength (minimum tensile strength ≥1310 MPa) but relatively lower toughness. It is suitable for components subjected to high static loads. The H1025 condition is aged at 552°C (1025°F), offering slightly lower strength (minimum tensile strength ≥1070 MPa) but significantly improved impact toughness and fatigue performance. It is therefore more suitable for shafts, valve stems and components subjected to cyclic loading.

Q2: How Does the Corrosion Resistance of 17-4 PH Compare with 316 Stainless Steel Round Bars?

A: In atmospheric, freshwater and mildly acidic environments, 17-4 PH H1025 offers corrosion resistance broadly comparable to 304 stainless steel. However, its corrosion resistance is generally lower than that of 316 stainless steel in high-chloride environments. For applications involving high chloride concentrations or seawater exposure, super duplex stainless steel or high-nickel alloys are recommended.

Q3: Can You Supply 17-4 PH Round Bars Pre-Machined to Finished Component Dimensions?

A: Yes. Based on your supplied CAD drawings, we can provide customized machining services, including turning, milling, drilling and grinding. We can deliver finished components in the H1025 aged condition, ready for assembly, together with final inspection reports.

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