Model No: 17-4PH

17-4PH Precipitation-Hardening Stainless Steel Tube

17-4PH stainless steel is widely used in aerospace, chemical, marine engineering, nuclear industry, and other fields due to its high strength, hardness, and good corrosion resistance.

Delivery :

FOB

minimum order :

100 kilograms

Supply Ability :

5000Tonkilograms / Month

Stock Time :

7-10Day

Country of Origin :

CHINA

Quantity :

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Product Introduction

17-4PH (UNS S17400, AISI 630) is a martensitic precipitation-hardening stainless steel. It offers a combination of both high hardness and corrosion resistance; based on our years of experience working with this material, our primary takeaway is that it strikes the optimal balance between the seemingly contradictory properties of"strength"and"corrosion resistance"—though one must indeed exercise caution when welding it.

"With standard stainless steel tubing, the strength is typically fixed, yet the hardness is often insufficient. 17-4PH, however, is different: our process involves first forming the material into a tube, and then subjecting it to an aging heat treatment. This allows us to double its strength and boost its hardness to over HRC 40. That is precisely where its greatest value lies."

Typical applications for 17-4PH tubing include high-pressure valves and pump bodies, aerospace fasteners, petrochemical pipelines, nuclear reactor components, food processing equipment, and offshore platform structural components. Simply put, 17-4PH is the preferred choice for any component requiring high strength, moderate corrosion resistance, and complex geometries.

Chemical Composition

Material Type	C	Nb	Ni	Cr	Cu	Fe
17-4PH	≤0.07	0.15-0.45	3.0-5.0	15.0-17.5	3.0-5.0	Balance

Copper (Cu) plays the leading role as the key element in precipitation hardening, while niobium (Nb) serves as the supporting player—stabilizing carbides, providing auxiliary strengthening, and refining grain structure. Chemical composition analysis using a spectrometer should focus primarily on these elements.

Mechanical Properties

The differences in 17-4PH resulting from different aging temperatures are substantial.

Aging Conditions	Temperature	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation	Hardness (HRC)
H900	480℃	≥1310	≥1180	≥10	≥40
H1025	540℃	≥1070	≥1000	≥12%	≥35
H1075	570℃	≥1000	≥865	≥13%	≥31

Note: The lower the aging temperature, the higher the strength; however, the lower the elongation (toughness). The H900 condition offers the highest strength and is suitable for wear-resistant components, while the H1150 condition provides the best toughness and is suitable for parts subjected to impact loads.

Physical Properties

Density: 7.78 g/cm³

Elastic Modulus: Approx. 200 GPa
Thermal Conductivity: Approx. 15 W/(m·K)
Coefficient of Thermal Expansion: Approx. 10.8 × 10⁻⁶/K (20–10

We would like to draw your particular attention to the following point:
Usage Temperature Limit: Do not exceed 300°C (572°F). Exceeding this temperature will cause the precipitate phase to coarsen, resulting in a decrease in strength.

Standards and Grades

If you require 17-4PH material, verifying the production standards applicable to the material is crucial.

Standard / Grade	illustrate
UNS S17400	Most Common Unified Numbering System Designation
AISI 630	American Iron and Steel Institute Designation
ASTM A564	Standard for Bars
ASTM A693	Standard for Plates
AMS 5643	Aerospace Material Specification
SUS630	Japanese Standard
ASTM A789/ A790	General Stainless Steel Pipe Standards

Confirm Product Specifications and Status

Regarding the 17-4PH precipitation-hardening stainless steel tubing you inquired about, there are several technical points that require clarification:

Dimensions: Outer Diameter, Wall Thickness, and Length
Condition: Solution-treated (Condition A) or Aged (H900, H1025, H1150, etc.)?
Melting Method: Standard AOD or Vacuum Melting (VIM/VAR)? Aerospace and nuclear power applications typically require the latter.

Recommendations for Condition Selection:
If welding or cold forming is required, select the solution-treated condition; aging can be performed after processing is complete.
If the tubing is to be used directly as a structural component without further processing, you may select the aged condition to eliminate an additional heat treatment step.
If you are unsure which condition the customer requires, you might ask:"Upon receipt, will this tubing be used directly, or will it undergo further processing?"