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Stainless Steels HOME >> Stainless Steels
PRODUCTS:Precipitation-Hardening Stainless Steel
GRADE:15-5PH、17-4PH、17-7PH、15-7Mo
PRODUCTION STANDARD:GB、GJB、ASTM、SAE AMS
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    Introduction:



    Martensitic and precipitation hardening stainless steels are heat treatable and can therefore provide hardness and strength in a wide range. Allowing to workability they are supplied in solution annealed condition. The downstream manufacturer performs final heat treatment to meet the mechanical properties required.

    Martensitic grades are basically Fe-Cr alloys with a higher carbon content than ferritics which enables them to harden on cooling in air, oil or water. Depending on grade and intended use, ductility is improved by tempering.

    Martensitic PH steels are used in aerospace, chemical and petrochemical, and food processing applications.

    Applications include:

    -  Gears

    -  Valves and other engine components

    -  High strength shafts

    - Turbine blades

    -  Moulding dies

    -  Nuclear waste casks

    Precipitation hardening stainless steels have many advantages, due to their chromium and nickel content, such as :

    -  Ability to gain high strength through heat treatment

    -  Corrosion resistance

    -  High tensile strengths

    -  Can be supplied in a “solution treated” condition, which is readily machinable

    -  Can be age-hardening, so material undergoes no distortion


    These are  17-4PH (Grade UNS S17400),  15-5PH (Grade UNS S15500),  PH 13-8Mo (Grade UNS S13800),  17-7PH (Grade UNS S17700) and  PH 15-7Mo (Grade UNS S15700).

     

    Table 1 Typical Compositions of some commoner precipitation hardening stainless steels

    Specification

    Common Name

    Type

    Typical Chemical Analysis %

    C

    Mn

    Cr

    Ni

    Mo

    Cu

    Al

    Ti

    Others

    A693 Tp630

    17/4PH

    martensitic

    0.05

    0.75

    16.5

    4.25

    -

    4.25

    -

    -

    Nb 0.3

    A693 Tp631

    17/7PH

    austenitic-martensitic

    0.06

    0.7

    17.25

    7.25

    -

    -

    1.25

    -

    -

     

    PH 15/7 Mo

    austenitic-martensitic

    0.06

    0.7

    15.5

    7.25

    2.6

    -

    1.3

    -

    -

     

    Table 2 Applications

    Type PH 13-8 

    Precipitation hardening stainless steel bar. American aerospace grade, vacuum arc remelted (type XM-13). Very high strength/toughness with good corrosion resistance. For aircraft structural components and use in petrochemical industry.

    Type 15-5 PH 

    Precipitation hardening stainless steel bar. American aerospace grade, vacuum arc remelted or electro-slag refined (type XM-12). High strength/toughness with good corrosion resistance. For aircraft/missile construction, chemical process equipment and nuclear reactor components.

    Type 15-7 PH

    Precipitation hardening stainless steel (grade 632) with high strength and moderate corrosion resistance. For spring type applications in aerospace and other markets.

    Type 17-4 PH

    Precipitation hardening stainless steel bar. American aerospace grade (type 630). High strength/toughness, good corrosion resistance and high fatigue resistance. For aerospace equipment and missile components. Commercial grade used in Oil and Gas.

    Type 17-7 PH

    Precipitation hardening stainless steel sheet and strip (grade 631) with excellent mechanical properties up to 480oC and moderate/good corrosion resistance. For components in aerospace, chemical processing and oil refining.

     

     

    Table 3 Standards

    TYPE

    BAR/WIRE

    SHEET/STRIP

    PLATE

    TUBE

    FORGINGS

    UNS

    PH 13-8 MO

    AMS-5629
    5840
    ASTM-A-564

    AMS5864

    AMS-5629

    UNS S13800

    15-5 PH

    AMS-5659
    ASTM-A 564

    AMS5862

    AMS5862

    AMS-5659

    UNS S15500

    15-7 MO
    AISI-632

    AMS-5812
    ASTM-A 564
    A 638
    B639

    AMS-5520

    AMS-5520
    MIL-S-25043

    ASTM-A 638
    B 637
    B 639

    UNS S15700

    17-4 PH
    AISI-630

    AMS-5622
    5643
    5825
    QQ-S-763
    ASTM-A 564

    AMS-5604
    MIL-S-81506

    AMS-5604
    MIL-S-81506

    AMS-5622
    5643

    AMS-5622
    5643

    UNS S17400

    17-7PH
    AISI-631

    AMS-5678

    AMS-5528
    5529
    MIL-S-25043

    AMS-5528
    MIL-S-25043

    UNS S17700

     


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