17-4 PH Heat Treated Bar

17-4 PH steel (AMS 5604) is a grade of martensitic, precipitation-hardening stainless steel with the additions of chromium, nickel, and copper. 17-4 stainless steel has a valuable combination of high strength, good corrosion resistance, and toughness in both base metals and welds. This material provides excellent corrosion resistance (comparable to grade 304) for many chemical, paper, and food processing industries, and it withstands corrosive attacks better than most hardenable stainless steels. These properties give designers the ability to add reliability to their products while simplifying fabrication and often reducing their costs. High strength is maintained to approximately 600°F (316°C).  17-4ph has good resistance to stress corrosion cracking at higher aging temperatures.  

17-4PH Heat Treated Inventory Size Ranges


0.375” – 1.500”

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Characteristics of 17-4 PH stainless steel

Also known as Alloy 630, type 17-4PH is the most widely used of all precipitation-hardening steels. Compared to other PH alloys, it requires a simple heat treatment to produce a wide range of properties, including its high strength. It has a slightly higher ferrite content than other PH grades, making it a bit more magnetic. To improve formability, heat treatments may be used before cold working.

We are suppliers of 17-4 PH stainless steel sheet and coil, in addition to stocking 17-4 PH plate and round bar. In addition to stocking 17-4 PH round bar further, we stock it in heat treated conditions and precision ground forms for medical and special applications. Our materials can be found in aerospace applications, gas turbines, chemical processing equipment, oil refining equipment, food processing industries and more.

Standard Inventory Specifications

  • UNS S17400
  • AMS 5604
  • ASTM A 693
  • ASTM A 564
  • ASTM F 899
  • ASME SA 693

Other industry standards we comply with:

  • W.NR. 1.4542
  • S1000 / S-SPEC-1
  • GE Aviation S-SPEC-35 AeDMS S-400
  • RR SABRe Edition 2
  • DFARS Compliant

Common Trade Names

  • 17-4 (® AK Steel)
  • ATI 17-4 (™ Allegheny Technologies)
  • Type 630 stainless

Common Applications of 17-4PH Heat Treated

  • Surgical instrumentation
  • Fasteners
  • Base plates
  • Chemical processing equipment
  • Oil and petroleum refining equipment
  • Nuclear components and waste casks
  • Food grade stainless steel for processing equipment
  • General metalworking applications that call for precipitation-hardening stainless steel
  • Paper / pulp processing
  • Aircraft and Aerospace materials

Chemical Composition

17-4PH Heat Treated Chemical Composition
Element Percent by Weight
C Carbon 0.07 maximum
Mn Manganese 1.00 maximum
P Phosphorus 0.04 maximum
S Sulfur 0.03 maximum
Si Silicon 1.00 maximum
Cr Chromium 15.00 - 17.50
Ni Nickel 3.00 - 5.00
Cu Copper 3.00 - 5.00
Nb Ta Columbium plus Tantalum 0.15 - 0.45
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17-4PH Heated Treated Physical Properties

  • Melting Range: 2560-2625°F (1404-1440°C)
  • Density: 0.2820 lb/in³

Mean Coefficient of Thermal Expansion (Annealed Condition)

Temperature Range Coefficients
°C °F μm/m·°C in/in/°F·106
21-93 70-200 10.8 6.0
21-204 70-400 10.8 6.0
21-316 70-600 11.2 6.2
21-427 70-800 11.2 6.3

Thermal Conductivity (H 900 Condition)

Temperature Range W/m·K Btu/(hr/ft²/in/°F)
°C °F
149 300 17.90 124
260 500 19.50 135
460 860 22.50 156
482 900 22.60 157
Specific Heat (Annealed Condition)
Temperature Range J/gg·K Btu/lb/°F
°C °F
0-100 32-212 460 0.11

Electrical Resistivity (Annealed Condition)

  • Microhm-cm: 98
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Mechanical Properties and Yield Strength 17-4PH Heat Treated Stainless Steel - Cold Flattened (Annealed)

  • Ultimate Tensile Strength Ksi (MPa): 160 (1103)
  • 0.2% Tensile Yield Strength Ksi (MPa): 145 (1000)
  • Elongation % in 2" (50mm): 5.0
  • Hardness Rockwell C: 35
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For a deeper understanding of the difference between 17-4 PH and 17-7 PH precipitation hardening alloys, request our white paper on the topic.

*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.