17-7PH UNS S17700 AISI 631 Stainless Steel Round Bar
Standard:AMS 5644 / ASTM A564/A564M
Diameter:5 Mm – 500 Mm
Length:1000–6000 Mm Or Customized
Surface Finish:Black, Bright, Polished, Peeled, Ground
Product Introduction
17-7PH AMS 5644 is a semi-austenitic precipitation-hardening stainless steel that combines good corrosion resistance, good formability, and high strength. It is typically supplied in the annealed condition and can be heat treated to Condition RH 950 or Condition TH 1050 to achieve significantly higher strength levels. With excellent mechanical performance, 17-7PH AMS 5644 maintains outstanding strength and reliability at service temperatures of up to 900°F (482°C).
17-7PH Stainless Steel Round Bar specifications
| Item | Specification |
|---|---|
| Product | 17-7PH Stainless Steel Round Bar |
| Standard | AMS 5644 / ASTM A564/A564M |
| Material Grade | 17-7PH |
| UNS | UNS S17700 |
| AISI | AISI 631 |
| JIS Equivalent | SUS631 |
| EN Equivalent | 1.4568 |
| Shape | Round Bar |
| Diameter | 5 mm – 500 mm |
| Length | 1000–6000 mm or Customized |
| Surface | Black, Bright, Polished, Peeled, Ground |
| Production | Hot Rolled, Cold Drawn, Forged |
| Certificate | EN10204 3.1 / MTC |
17-7PH Stainless Steel Round Bar Diameter & Weight Chart
| Diameter (mm) | Weight (kg/m) | Diameter (inch) | Weight (lb/ft) |
|---|---|---|---|
| 6 | 0.22 | 1/4" | 0.15 |
| 8 | 0.39 | 5/16" | 0.26 |
| 10 | 0.62 | 3/8" | 0.42 |
| 12 | 0.89 | 1/2" | 0.60 |
| 16 | 1.59 | 5/8" | 1.07 |
| 20 | 2.48 | 3/4" | 1.67 |
| 25 | 3.88 | 1" | 2.61 |
| 30 | 5.59 | 1-1/4" | 3.76 |
| 40 | 9.94 | 1-1/2" | 6.68 |
| 50 | 15.53 | 2" | 10.44 |
| 60 | 22.36 | 2-1/2" | 15.03 |
| 75 | 34.93 | 3" | 23.48 |
| 80 | 39.74 | 3-1/4" | 26.71 |
| 100 | 62.09 | 4" | 41.74 |
| 120 | 89.41 | 5" | 60.09 |
| 150 | 139.70 | 6" | 93.92 |
| 200 | 248.35 | 8" | 166.94 |
Theoretical weight is calculated based on a density of 7.80 g/cm³. Actual weight may vary slightly depending on manufacturing tolerances.
17-7PH vs 17-4PH Stainless Steel Bar
Both 17-7PH Stainless Steel Bar and 17-4PH Stainless Steel Bar are precipitation-hardening stainless steels that provide excellent strength, corrosion resistance, and heat treatment performance. However, they differ in chemical composition, mechanical properties, and typical applications. Choosing the right material depends on your project's strength, formability, and service environment requirements.
17-7PH vs 17-4PH Comparison
| Property | 17-7PH Stainless Steel Bar | 17-4PH Stainless Steel Bar |
|---|---|---|
| UNS Number | UNS S17700 | UNS S17400 |
| AISI Grade | AISI 631 | AISI 630 |
| Common Standard | AMS 5644 | ASTM A564/A564M |
| Microstructure | Semi-Austenitic PH Stainless Steel | Martensitic PH Stainless Steel |
| Heat Treatment | RH950, CH900, TH1050 | H900, H1025, H1075, H1150 |
| Tensile Strength | Up to 1700 MPa | Up to 1310–1450 MPa |
| Corrosion Resistance | Excellent | Excellent |
| Formability | Excellent before hardening | Good |
| Weldability | Good | Excellent |
| Spring Properties | Outstanding | Moderate |
| Machinability | Good | Excellent |
| Magnetic | Slightly magnetic after heat treatment | Magnetic |
| Maximum Service Temperature | Up to 900°F (482°C) | Up to 600°F (316°C) |
| Typical Applications | Springs, aerospace parts, diaphragms, bellows | Valve stems, pump shafts, fasteners, aerospace components |
Advantages of 17-7PH Stainless Steel Bar
Higher tensile and fatigue strength after precipitation hardening
Excellent spring performance and elastic recovery
Good corrosion resistance in industrial and marine environments
Superior formability in the annealed condition
Ideal for components subjected to repeated cyclic loading
Advantages of 17-4PH Stainless Steel Bar
Higher hardness with excellent dimensional stability
Better machinability than 17-7PH
Excellent weldability
Outstanding corrosion resistance for industrial service
Widely used for heavy-duty structural and mechanical components
Which Stainless Steel Bar Should You Choose?
Choose 17-7PH Stainless Steel Bar if your application requires:
High fatigue resistance
Excellent spring properties
High elastic recovery
Lightweight aerospace components
Thin-walled precision parts
Choose 17-4PH Stainless Steel Bar if your application requires:
High strength and hardness
Superior machinability
Better weldability
Heavy-duty mechanical components
General industrial and petrochemical equipment
Applications Of AMS 5644 17-7PH Round Bar Products Description
AMS 5644 17-7PH UNS S17700 AISI 631 Stainless Steel Round Bar is widely used in industries requiring high strength, excellent fatigue resistance, and good corrosion resistance.
Aerospace components
Aircraft springs
Fasteners and retaining rings
Precision shafts
Valve and pump components
Medical instruments
CNC machined parts
Petrochemical equipment
Industrial springs
Electronic components
FAQ
1. What is 17-7PH Stainless Steel Round Bar?
17-7PH is a semi-austenitic precipitation-hardening stainless steel offering high strength, excellent fatigue resistance, and good corrosion resistance.
2. What are the equivalent grades of 17-7PH?
Equivalent grades include UNS S17700, AISI 631, SUS631, and EN 1.4568.
3. Can 17-7PH Stainless Steel be heat treated?
Yes. It can be heat treated to conditions such as RH950, CH900, and TH1050 to achieve higher strength and hardness.
4. Is 17-7PH Stainless Steel corrosion resistant?
Yes. It provides good corrosion resistance in atmospheric, marine, and many industrial environments.
5. What surface finishes are available?
Available finishes include Hot Rolled, Cold Drawn, Bright, Polished, Peeled, and Centerless Ground.
6. Do you provide custom sizes?
Yes. We offer custom diameters, lengths, cutting, machining, and surface finishing services.
7. What industries use 17-7PH Stainless Steel Round Bar?
It is widely used in aerospace, medical, spring manufacturing, petrochemical, precision engineering, and industrial equipment.
8. Do you provide Material Test Certificates?
Yes. We can provide EN 10204 3.1 MTC, PMI reports, and third-party inspection certificates upon request.
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