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.