17/7 PH (Precipitation Hardening) Stainless Steel

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Grade Designation and Chemical Composition - Precipitation Hardening Stainless Steel (17/7 PH) Header

European Designation EN 10088-2 2005 Former BS Standard American European Designations chemical composition (% weight)
Number Name BS 1554 1990 nearest fit AISI nearest fit ASTM UNS nearest fit C Si Mn P N Cr Ni Mo Al
1.4568 X7 Cr Ni Al 17-7 301S81 631 S 17700 0.09 0.7 1 0.04 0.015 16.00 – 18.00 6.50 – 7.80 - 0.70 – 1.50

Mechanical Properties - Precipitation Hardening Stainless Steel (17/7 PH) Header

Nominal Diameter (mm) Min Tensile Strength Cold drawn
(Condition C). (N/mm²)
Expected Min Tensile For
Precipitation Hardened (N/mm²)
less than 0.20 1975 2275
0.20 – 0.30 1950 2250
0.30 – 0.40 1925 2225
0.40 – 0.50 1900 2200
0.50 – 0.65 1850 2150
0.65 – 0.80 1825 2125
0.80 – 1.00 1800 2100
1.00 – 1.25 1750 2050
1.25 – 1.50 1700 2000
1.50 – 1.75 1650 1950
1.75 – 2.00 1600 1900
2.00 – 2.50 1550 1850
2.50 – 3.00 1500 1800
3.00 – 3.50 1450 1750
3.50 – 4.25 1400 1700
4.25 – 5.00 1350 1650
5.00 – 6.00 1300 1550
6.00 – 7.00 1250 1500
7.00 – 8.50 1250 1500
8.50 – 10.00 1250 1500
Note : The maximum tensile strength shall be the minimum value plus 15%.

Service Properties - Precipitation Hardening Stainless Steel (17/7 PH) Header

European Steel Designation EN10088-2: 2005 Former BS Standard nearest fit BS 2056: 1993 AISI Nearest Fit Services Properties Applications
X7 Cr Ni Al 17-7 301S81 631 Improved corrosion resistance when compared with martensitic steels although less so than the base grade austenitic stainless steel 1.4301 (AISI 304). Good formability in the hard drawn condition (Condition C) and heat treated after forming to further enhance the mechanical properties. High temperature fasteners, springs.

Wire Stockists

Knight Precision Wire is part of Knight Group, a group of companies that specialise in the processing and supply of precision metals. Quality is of the utmost importance and Knight Precision Wire operates a vigorous quality management system.

People outside the wire industry may be unaware of the sheer number of wire variations out there. Wire is an essential commodity in numerous sectors and appears in many different forms. Sectors that KPW supply wire for include the Aerospace, Medical, Petrochemical, Industrial and Heat Treatment industries. For the aerospace sector, KPW have been approved as aerospace wire suppliers by Rolls Royce, British Aerospace and Westlands. Two of the primary products supplied to the aerospace industry are locking wire and aerospace cable. You can see case study examples of how the services provided by KPW have benefited the different sectors on the website.

Below is a list of the different wire products offered by KPW :

  • Stainless Steel
  • Carbon Steel
  • Nickel & Nickel Alloys
  • Copper & Copper Alloys
  • Special Wire Materials

Visit the stainless wire product page to see more information about the different stainless wires we produce. To see all of KPW's steel wires products then visit the products page.

In addition to providing wire products to many different companies and sectors, KPW also offer wire processing services. These services include :

  • Cut to Length Wire
  • Flat Wire
  • Square and Shaped Wire
  • Stranding and Bunching
  • Rewinding and Spooling
  • Polishing & Cleaning

To find out how KPW can help you with your special wire needs, send an enquiry using the form on the contact page.