17-4PH Stainless Steel Bar AMS 5643 / AMS 5622

Product Detail

17-4PH Stainless Steel Bar (AMS 5643 / AMS 5622)

17-4PH Stainless Steel Bar is a precipitation-hardening martensitic stainless steel bar known for its excellent combination of high strength, good corrosion resistance, and reliable dimensional stability. It is widely used in aerospace, energy, petrochemical, marine, valve, shaft, fastener, and precision engineering applications. Under international material systems, 17-4PH is commonly identified as UNS S17400, Grade 630, 1.4542, and X5CrNiCuNb16-4. For customers requiring aerospace-grade supply, AMS 5643 and AMS 5622 are two frequently referenced standards for bar products.

Product Introduction

17-4PH stainless steel bar offers a practical solution for applications where conventional stainless steels do not provide enough strength, while ordinary alloy steels cannot deliver the required corrosion resistance. One of its main advantages is that it can be supplied in the solution-treated condition and then strengthened through aging heat treatment, allowing manufacturers to achieve high mechanical properties with relatively low distortion. Compared with common austenitic stainless steels such as 304 or 316, 17-4PH provides much higher yield and tensile strength. At the same time, it maintains good resistance to many industrial and mildly corrosive environments, making it a popular material for demanding structural and mechanical components.

Key Features of 17-4PH Stainless Steel Bar

High tensile strength and yield strength after aging treatment
Good corrosion resistance for industrial and marine-related service environments
Good machinability in solution-treated condition
Excellent dimensional stability during heat treatment
Suitable for precision shafts, valve parts, fasteners, fittings, and aerospace components
Available in multiple aging conditions such as H900, H925, H1025, H1075, H1100, and H1150

Product Specifications

Item	Description
Product Name	17-4PH Stainless Steel Bar
Material Grade	17-4PH / UNS S17400 / Grade 630 / 1.4542
Standards	AMS 5643, AMS 5622, ASTM A564, ASME SA564
Forms	Round Bar, Flat Bar, Square Bar, Hex Bar, Forged Bar
Surface Finish	Black, Peeled, Rough Turned, Bright, Polished, Centerless Ground
Diameter Range	6 mm to 350 mm
Length	1000 mm to 6000 mm or as required
Heat Treatment	Solution Treated / Condition A / Aged Condition
Certification	EN 10204 3.1 / Mill Test Certificate / PMI / UT on request
Origin	China

Chemical Composition of 17-4PH Stainless Steel Bar

Element	Content (%)
Carbon (C)	Max 0.07
Manganese (Mn)	Max 1.00
Silicon (Si)	Max 1.00
Phosphorus (P)	Max 0.040
Sulfur (S)	Max 0.030
Chromium (Cr)	15.00 - 17.50
Nickel (Ni)	3.00 - 5.00
Copper (Cu)	3.00 - 5.00
Niobium + Tantalum (Nb+Ta)	0.15 - 0.45

Mechanical Properties of 17-4PH Stainless Steel Bar

Condition	Tensile Strength	Yield Strength	Elongation	Hardness
H900	Min 1310 MPa	Min 1170 MPa	Min 10%	Approx. HRC 40 - 47
H925	Min 1170 MPa	Min 1070 MPa	Min 10%	Approx. HRC 38 - 44
H1025	Min 1070 MPa	Min 1000 MPa	Min 12%	Approx. HRC 35 - 40
H1075	Min 1000 MPa	Min 860 MPa	Min 13%	Approx. HRC 32 - 38
H1100	Min 965 MPa	Min 795 MPa	Min 14%	Approx. HRC 30 - 36
H1150	Min 930 MPa	Min 725 MPa	Min 16%	Approx. HRC 28 - 37

AMS 5643 vs AMS 5622 Comparison

Both AMS 5643 and AMS 5622 refer to 17-4PH stainless steel products, but they are not positioned exactly the same in practice.

Item	AMS 5643	AMS 5622
Material Type	17-4PH Stainless Steel	17-4PH Stainless Steel
UNS	S17400	S17400
Main Supply Form	Bar, Wire, Forgings, Tubing, Rings	Bar, Wire, Forgings, Tubing, Rings
Melting Route	Standard aerospace supply route	Vacuum melt route such as VAR / CEVM
Typical Application Level	General aerospace and industrial use	Higher reliability and more critical applications
Material Cleanliness	Standard controlled quality	Higher metallurgical cleanliness requirement

In simple terms, AMS 5643 is commonly selected for mainstream aerospace and industrial bar applications, while AMS 5622 is usually chosen when customers require a vacuum-melt quality route for more critical service conditions.

Equivalent Grades and International Designations

System	Designation
UNS	S17400
ASTM / ASME	ASTM A564 / ASME SA564 Grade 630
AISI	630
EN	1.4542
DIN / EN Name	X5CrNiCuNb16-4
AMS	AMS 5643 / AMS 5622

Typical Applications

Aerospace shafts, fittings, and structural components
Valve stems, pump shafts, and mechanical seal components
Oil and gas tools and high-strength fasteners
Marine hardware and offshore equipment parts
Chemical processing and petrochemical machinery
Paper, food processing, and industrial precision parts

Available Sizes and Supply Condition

We can supply 17-4PH stainless steel bar in a wide range of sizes and conditions according to customer drawings, machining requirements, and final application demands.

Bar Type	Common Size Range	Supply Condition
Round Bar	6 mm - 350 mm	Solution Treated / Aged
Flat Bar	Thickness 6 mm - 80 mm	Hot Rolled / Forged / Machined
Square Bar	8 mm - 100 mm	Hot Rolled / Forged
Hex Bar	8 mm - 65 mm	Bright Drawn / Machined
Forged Bar	Customized	Forged + UT + Rough Machined

Inspection and Quality Control

To ensure reliable performance and traceability, 17-4PH stainless steel bar can be supplied with full inspection documents and additional testing according to project requirements.

Packing of 17-4PH Stainless Steel Bar

Standard export packing is designed to protect the bars from rust, surface damage, and transportation impact during long-distance shipment. Bundles, wooden cases, waterproof wrapping, and end protection can be arranged according to size and shipping method.

Why Choose Our 17-4PH Stainless Steel Bar

Stable raw material sourcing and controlled production process
Support for AMS, ASTM, and customer-specific technical requirements
Available for aerospace, industrial, and precision machining applications
Flexible supply in forged, hot rolled, bright, and machined condition
Fast response for quotation, stock inquiry, and technical confirmation

FAQ

What is 17-4PH stainless steel bar used for?

17-4PH stainless steel bar is widely used for shafts, valves, fasteners, fittings, aerospace parts, marine hardware, and other components requiring both high strength and corrosion resistance.

What is the difference between AMS 5643 and AMS 5622?

AMS 5643 is a mainstream aerospace specification for 17-4PH products, while AMS 5622 generally refers to vacuum-melt material with higher metallurgical cleanliness for more critical applications.

Is 17-4PH stronger than 316 stainless steel?

Yes. 17-4PH offers significantly higher strength than 316 stainless steel, especially after aging heat treatment. It is often selected when 316 does not provide enough mechanical performance.

Can 17-4PH stainless steel bar be machined?

Yes. It is commonly machined in solution-treated condition and then aged to achieve the required final hardness and strength.

What forms of 17-4PH bar can you supply?

We can supply round bar, flat bar, square bar, hex bar, and forged bar according to customer requirements.

Can you provide MTC and UT reports?

Yes. EN 10204 3.1 certificate, PMI, UT, hardness test, and other inspection reports can be provided upon request.

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