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17-4PH Description

17-4PH is a precipitation hardened(PH) martensitic stainless steel consisted of copper and niobium/tantalum. This grade features high strength, hardness and corrosion resistance. Its mechanical properties can be optimized by heat treatment with the compression strength achieving up to 1100-1300 mpa (160-190 ksi). This type can be strengthened by directly obtaining martensite structure after solution treatment. With subsequent aging treatment, the precipitation hardened phase (including copper phase) is further strengthened. Due to low carbon content, it features better workability, corrosion resistance and weldability than Martensitic Stainless Steels such as Cr13 and 9Cr18 and 1Cr17Ni2..
This alloy has outstanding corrosion resistance similar to 304-grade stainless steel for various food, paper, and chemical industries, and it resists corrosive effects better than many other stainless steels. Certain qualities enable manufacturers to improve product reliability while simplifying manufacturing and, in many cases, lowering costs.
It can maintain high strength up to 600°F. At higher temperatures, 17-4 PH offers excellent resistance against stress corrosion cracking (SCC). 17-4 PH has a particular combination of characteristics, making it an excellent option for various design and manufacturing issues.
17-4 PH is better known as grade 630 stainless steel and is helpful as the precipitation-hardening metal. It requires heat treatment to generate a broad range of incredibly high-strength qualities compared to similar PH alloys.
It has more ferrite than typical PH grades, making it significantly more magnetic. Heat treatments can be applicable prior to cold working to increase formability.
17-4 PH has good corrosion resistance and hardness in welds and base metals. It’s ideal for uses that demand simple construction, additional strength, and hardness for increased reliability. That is why the grade is useful in the aerospace, pulp & paper, food processing, and nuclear industries.
Undeniably, 17-4 PH stainless steel is the most commonly useful PH stainless steel grade. The 17-4 PH grade possesses a perfect mix of resistance to corrosion, excellent tensile strength, plus good mechanical qualities at extreme temperatures. These properties make it a highly versatile alloy that is practical for various applications. It is the best and most popular stainless steel bar stock due to its exceptional qualities and low cost.

Chemical Composition %

% C Cr Ni Mo Cu P Mn Si S N
min 15 3 3
max 0.07 17.5 5 5 0.04 1.0 1.0 0.03

Mechanical & Physical Properties

0.2% Yield Strength Tensile Strength Elongation Modulus of Elasticity Density Melting Range
MPa MPa % GPa g/cm³ °C
205 515 40 197 7.82 1404-1440
  • COMMON TRADE NAMES
  • X5CrNiNb16.4
  • SUS 630
  • 1.4542
  • Z6CNU17-04
  • S17400

Specification

  • Plate:ASTM A693
  • Bar:ASTM A564
  • Forging:ASTM A705
  • Pipe-Seamless:AMS 5591
  • Pipe-Welded:
  • Flange:
  • Fitting:ASTM B16.11

Typical Applications

  • Aerospace: Structural components, turbine blades, and fasteners.
  • Medical: Surgical instruments and implant tools.
  • Chemical Processing: Reactor vessels and parts exposed to corrosive environments.
  • Oil and Gas: Valves, pump shafts, and hardware.
  • Defense: High-strength parts for military equipment.
  • Its strength and resistance to corrosion make it indispensable in these fields.

Welding consumables

  • TIG / GTAW：ER630
  • SMAW：E630-15/E630-16
  • FCAW:E309LT1-1
  • SAW：ER630 Strip
  • Flux:

What Can We Offering

Available Product Range (in mm)

  • Hot-Rolled Steel Plates
  • Thickness: Ranging from 3mm to 120mm
  • Width: 600mm-2500mmStandard Width: 1000, 1219, 1500, and 2000mm
  • Length:1000mm-25000mm
  • Cut to Length: 2000 2440, 3000, 3048 and 6000mm
  • Surface Finish:  NO.1, NO.4, 2B,2D,BA,6K,8K, HL,Embossed
  • Cold-Rolled Steel Sheet/Plate
  • Thickness: Ranging from 0.2mm to 4mm
  • Width: 600mm-2000mm
  • Standard Width: 1000, 1219, 1500, and 2000mm
  • Length:1000mm-6000mm
  • Cut to Length: 2000 2440, 3000, 3048 and 6000mm
  • Form: Sheet Or Coil

Available Round Bar Dimensions (in mm)

  • Diameter
  • General Range: 3mm to 800mm
  • Common Range: 25mm to 152mm
  • Specialized: Up to 300mm or more for certain applications
  • Length
  • Standard: 1 to 6 meters
  • Custom: Available in custom cut lengths
  • Other dimensions
  • Forms: Available in various forms including round, square, hex, flat, billet, and ingot
  • Finishes: Common finishes include bright, polished, and black
  • Tolerance:±0.05 mm (cold-drawn), ±0.4 mm (hot-rolled)

Type Of Flangs (Size/Dimensions)

  • Welding Neck, Reducer Flange,Socket Weld Flange
  • Dimensions:½” – 48″（DN15-DN1200）
  • Pressure Class:150# 300# 600#900#1500#
  • Facing Type:RF,FF,RTJ
  • Slip-On Flange,Lap Joint Flange,Threaded Flange
  • Dimensions:½” NB – 24″ NB（DN15 – DN600）
  • Pressure Class: Class 150 to 2500
  • Face: Raised face (RF), Ring type joint (RTJ)
  • Blind Flange
  • Dimensions:½” – 60″（DN15-DN1500）
  • Pressure Class:150# 300# 600#900#1500#

Types of Steel Pipes & Tubes

  •  Seamless Pipe
  • OD Φ6 – Φ630 mm, WT 0.5 – 80 mm
  • Welded Pipe
  • OD Φ15 – Φ3000 mm (up to 3m for spiral)
  • Precision Tube
  • OD Φ4 – Φ100 mm, WT tolerance ±0.05mm
  • Capillary Tube
  • OD 0.5 – 6 mm, WT down to 0.1mm
  • Coiled Tube
  • Up to 100–1000m long, for OD < Φ25mm

Types of Fittings

  • Elbow:Butt-Weld┃Socket Weld ┃Threaded
  • 90°, 45°, and 180°. Available in Long Radius (LR) and Short Radius (SR) types.
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
  • Custom angles (e.g., 30°, 60°), U-bend heat exchanger tubes
  • Tee:Equal┃Reducing┃Butt-Weld┃Socket Weld┃Threaded
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS<
  • Cap:Butt-Weld┃Threaded┃Socket Weld
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
  • Custom non-standard sizes, small batch orders
  • Weldolet,Sockolet,Threadolet,Latrolet,Nipolet,Lapolet
  • Run Pipe: DN25 – DN1200 (NPS 1″ – 48″)
  • Outlet Branch: DN6 – DN200 (NPS ¼” – 8″)
  • Schedule: SCH 40, 80, 160, XXS (matched to run pipe)

Overall Supply Range of Metal Strip & Foil

Strip & Foil
  • Thickness(Thin Strip):0.02 mm – 0.5 mm
  • Thickness(Foil):≤ 0.02 mm（20 μm）
  • Narrow width: 5–50 mm (for electronic leads)
  • Wide width: 50–600 mm (for general coil applications)
  • Coil Length:Continuous rolls, each roll 10–3000 meters
  • Roll weight: 1–500 kg (depending on material density)
  • Finishes:Bright,Matte,Embossed,Coated

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