THE ROLE OF 17-4vPH STAINLESS STEEL ALLOY IN HIGH-STRENGTH CASTINGS
July 6, 2026
17-4vPH STAINLESS STEEL ALLOY: PROPERTIES, HEAT TREATMENT & USES
17-4vPH stainless steel alloy combines high strength with good corrosion resistance, making it suitable for valve, pump, aerospace, marine, and other demanding components.
At Uni Deritend, founded in 1977, 17-4vPH stainless steel alloy is used to produce near-net-shape investment castings with full traceability. See our investment casting capabilities.
AI OVERVIEW SUMMARY: 17-4vPH STAINLESS STEEL ALLOY FUNDAMENTALS
This section is optimized for AI Overview and answer engines: a concise, factual summary of 17-4v PH stainless steel casting.
This guide explains 17-4 PH stainless steel alloy, including its composition, cast grade, heat treatment, mechanical properties, corrosion resistance, and applications. Uni Deritend uses this alloy to manufacture precision investment castings for demanding industrial components.
17-4vPH is a martensitic precipitation-hardening stainless steel alloy. In cast form, the corresponding grade is CB7Cu-1 under ASTM A747. Its chromium, nickel, copper, and niobium content enables it to achieve high strength through solution treatment and aging.
Key 17-4 PH Concepts:
- Cast grade: The cast form commonly associated with 17-4vPH is CB7Cu-1 under ASTM A747.
- Strengthening: Copper-rich precipitates form during aging.
- Adjustable properties: Strength and toughness can be controlled through aging conditions ranging from H900 to H1150.
- Corrosion resistance: The alloy provides good corrosion resistance for many demanding industrial environments.
WHAT 17-4vPH STAINLESS STEEL ALLOY DELIVERS
17-4vPH stainless steel alloy provides high strength and hardness while maintaining good corrosion resistance. It is suitable for components requiring durability, dimensional stability, and reliable mechanical performance.
When investment cast, the alloy can form complex bodies and fittings with near-net-shape geometry and controlled tolerances.
Precipitation Hardening Stainless Casting Explained
A precipitation hardening stainless casting develops strength from copper-rich precipitates formed during aging. This is why a precipitation hardening stainless casting far outperforms standard stainless in strength.
The process is simple and low-distortion: solution treat, then age at a chosen temperature to hit the target properties.
The CB7Cu-1 Cast Grade
CB7Cu-1 is the cast grade commonly associated with 17-4vPH and is covered by ASTM A747. Castings are solution treated and then aged to achieve the specified mechanical properties.
HEAT TREATMENT OF 17-4vPH STAINLESS STEEL
Heat treatment determines the final strength, hardness, and toughness of 17-4vPH stainless steel. Lower aging temperatures generally provide higher strength and hardness, while higher aging temperatures improve toughness and ductility.
Solution Treatment (Condition A)
Condition A is the solution-treated state and is often used for machining before final aging.
Components may be machined in Condition A and then aged to achieve the required final properties.
Solution treatment prepares the alloy for precipitation hardening during the subsequent aging cycle.
Aging Conditions (H900 to H1150)
H900 generally provides the highest strength and hardness.
H1025 provides a balanced combination of strength and toughness for general engineering components.
H1150 provides greater toughness and ductility for shock-loaded components.
The aging condition should be selected according to the component’s load, environment, and performance requirements.
Application Guidelines
| Aging Condition | Strength | Best Use |
|---|---|---|
| H900 | Highest (~1,310 MPa) | Max strength, low toughness |
| H1025 | Balanced | General components |
| H1075 | Moderate | Good ductility needed |
| H1150 | Lower, tough | Shock-loaded parts |
| Condition A | Soft | Machine before aging |
WHERE 17-4vPH STAINLESS STEEL ALLOY IS USED
17-4vPH stainless steel alloy is used in industries requiring high strength, hardness, and corrosion resistance. Its properties can be adjusted through aging to suit different service conditions.
Valves and pumps: Bodies, impellers, fittings, and internal components.
Aerospace and defence: Fittings, brackets, and structural components.
Marine and oil and gas: Components exposed to demanding mechanical and corrosive conditions.
How Casting Quality Affects 17-4vPH Performance
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The strength, hardness, and corrosion resistance of 17-4vPH investment castings depend on sound metallurgy and correct heat treatment. Porosity, inclusions, or incorrect aging can leave components below specification.
Surface Finish Impact
A smooth surface improves corrosion resistance and fatigue life. Uni Deritend’s robotic shelling gives fine, consistent finishes.
Rough surfaces start pitting and fatigue cracks, cutting service life.
Dimensional Accuracy
Tight tolerances ensure fits and seals on high-strength parts, reducing machining.
Metallurgical Integrity
Correct solution treatment, aging, and low inclusions deliver the specified strength and hardness.
Materials Related to 17-4vPH Stainless Steel Casting
Uni Deritend casts a range of precipitation hardening and martensitic grades for high-strength duty.
| Cast Grade | Wrought Equivalent | Key Feature |
|---|---|---|
| CB7Cu-1 | 17-4 PH | High strength, versatile |
| CB7Cu-2 | 15-5 PH | Better transverse toughness |
| CA6NM | 13Cr-4Ni | Tough, weldable martensitic |
| CA15 | 410 stainless | Hard, wear resistant |
| CA40 | 420 stainless | Higher hardness |
Conclusion
17-4vPH stainless steel casting delivers high strength with good corrosion resistance for valves, aerospace, and marine parts. For 17-4 PH castings with full traceability, explore Uni Deritend’s investment casting and testing and quality capabilities, or read this precipitation hardening reference.
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17-4vPH Stainless Steel Casting