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UNS S17700 / AISI 631 Special Alloys For Clean Energy And Oceaneering Excellent Hardness

Categories Special Alloys For Clean Energy And Oceaneering
Brand Name: CMMC
Model Number: As per specification and drawing
Certification: API, ISO, AS, PED etc.
Place of Origin: CMMC in CHINA
MOQ: Negotiable
Price: Negotiable
Payment Terms: D/P, L/C, T/T
Supply Ability: 300 pieces per day
Delivery Time: 60-90 days
Packaging Details: Water prevent, seaworthy transport, mill's export standard packing
Material: UNS S17700, a semi-austenitic chromium-nickel-aluminum precipitation-hardening stainless steel
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    UNS S17700 / AISI 631 Special Alloys For Clean Energy And Oceaneering Excellent Hardness

    UNS S17700 (17-7PH, AISI 631) semi-products for stainless elastic element, engine thrust unit component, ship shaft


    UNS S17700 (17-7PH, AISI 631) semi-products for stainless elastic element, engine thrust unit component, ship shaft etc.

    UNS S17700 is available in product forms as plate, sheet, strip, pipe, tube, bar (round, flat, hexagon, square, shapes), wire (profile, round, flat, square), forgings, etc.


    07Cr17Ni7Al(GB/T), 17-7PH,AISI 631(ASTM), SUS 631(JIS), W.Nr. 1.4568, ATI 17-7™


    UNS S17700 provides valuable property combinations particularly well suited for aerospace and many spring type applications requiring high strength.

    This special alloy also provides benefits for other applications requiring formability, high strength and good corrosion resistance, as well as excellent properties for flat springs, belleville (conical spring) washers, stainless elastic element, eyelets, clips, surgical parts, blades, bellows, honeycomb, engine thrust unit component, membrane, ship shaft, compressor disc and strain gauges at temperatures up to 600°F (316°C).


    S17700 stainless steel is a semi-austenitic chromium-nickel-aluminum precipitation-hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance and minimum distortion upon heat treatment. It is easily formed in the annealed condition, then hardened to high strength levels by simple heat treatments to Conditions RH 950 and TH 1050. The exceptionally high strength of Condition CH 900 offers many advantages where limited ductility and workability are permissable.

    In its heat-treated condition, this alloy provides exceptional mechanical properties at temperatures up to 900°F (482°C). Its corrosion resistance in both Conditions TH 1050 and RH 950 is superior to that of the hardenable chromium types. In some environments, corrosion resistance approximates that of the austenitic chromium nickel stainless steels. In Condition CH 900, its general corrosion resistance is comparable to that of Type 304. Fabricating practices recommended for other chromium-nickel stainless steels can be used for this material.

    In addition to material produced by the standard refining procedures, material which has been vacuum arc or electroslag remelted is available for further increase in resistance to fatigue, for those applications subject to cyclic stresses.




    Physical propertiesCondition
    ATH 1050RH 950CH 900
    Densitylbs./in3. (g/cm3)0.282 (7.81)0.276 (7.65)0.276 (7.65)0.277 (267)
    Modulus of elasticityksi. (GPa)29.0 x 103 (200)29.0 x 103 (200)
    Electrical resistivityµΩ•cm80828383
    Magnetic permeability
    @ 25 oersteds1.4 – 3.4132 – 19482 – 88
    @ 50 oersteds1.4 – 3.6120 – 167113 – 130
    @ 100 oersteds1.4 – 3.580 – 9975 – 8770
    @ 200 oersteds1.4 – 3.246 – 5544 – 5243.5
    Maximum1.4 – 3.6134 – 208119 – 135125
    Thermal conductivity,
    BTU/hr./ft2./°F (W/m/K)
    300 °F (149 °C)117 (16.9)117 (est) (16.9)114 (16.4)
    500 °F (260 °C)128 (18.5)128 (est) (18.5)127 (18.3)
    840 °F (449 °C)146 (21.1)146 (est) (21.1)150 (21.6)
    900 °F (482 °C)146 (21.1)146 (est) (21.1)151 (21.8)
    Mean coefficient of thermal expansion
    in./in./°F (μm/m/K)
    70 – 200 °F
    (21 – 93 °C)
    8.5 x 10-6 (15.3)5.6 x 10-6 (10.1)5.7 x 10-6 (10.3)6.1 (11.0)
    70 – 400 °F
    (21 – 204 °C)
    9.0 x 10-6 (16.2)6.1 x 10-6 (11.0)6.6 x 10-6 (11.9)6.2 (11.2)
    70 – 600 °F
    (21 – 316 °C)
    9.5 x 10-6 (17.1)6.3 x 10-6 (11.3)6.8 x 10-6 (12.2)6.4 (11.5)
    70 – 800 °F
    (21 – 427 °C)
    9.6 x 10-6 (16.0)6.6 x 10-6 (11.9)6.9 x 10-6 (12.4)6.6 (11.9)


    Typical room temperature mechanical properties

    ATTH 1050A 1750R 100RH 950CCH 900
    UTS, ksi. (MPa)120(827)145(1000)200(1379)133(917)175(1207)230(1586)230(1586)295(2034)
    0.2% YS, ksi. (MPa)45(310)100(690)185(1276)42(290)115(793)210(1448)190(1310)275(1896)
    Elongation % in 2"3598199752
    Rockwell HardnessB85C31C43B85C37C48C44C52


    Corrosion resistance of S17700 stainless steel in Conditions TH 1050 and RH 950 is generally superior to that of the standard hardenable chromium types of stainless steels such as Types 410, 420 and 431, but is not quite as good as chromium-nickel Type 304. Corrosion resistance in Condition CH 900 approaches that of Type 304 stainless steel in most environments.

    Stress cracking in marine environments

    The precipitation-hardening stainless steels, like the hardenable chromium stainless steels, may be subject to stress corrosion cracking when stressed and exposed to some corrosive environments. The tendency is related to the type of stainless steel, its hardness, the level of tensile stress and the environment.

    Stress cracking tests on the precipitation- hardening alloys has been conducted in a marine atmosphere 82 ft. (25 m) from the waterline using two-point loaded bent-beam specimens.

    Data reported here are the results of multiple specimens exposed at stress levels of 50 and 75% of the actual yield strength of the materials tested. Test specimens were 0.050 in. (0.127 mm) thick heat treated to Conditions TH 1050 and RH 950. Specimens in Condition CH 900 were 0.041 in. (1.04 mm) thick. The long dimension of all specimens was cut transverse to the rolling direction.

    When comparing the various heat-treated conditions, the data show that S17700 stainless steel has the greatest resistance to stress cracking in Condition CH 900. Likewise, Condition TH 1050, although somewhat less resistant than Condition CH 900, appears to be more resistant to stress cracking than Condition RH 950.

    Table 8-1 summarizes the test data. In addition, in the mild industrial atmosphere, specimens stressed at 90% of their yield strength had not broken after 730 days of exposure.

    Table 8-1 Summary of stress-cracking tests in coastal exposure

    Heat TreatmentStressed at 50% of the 0.2% Yield StrengthStressed at 50% of the 0.2% Yield Strength
    Stress, ksi. (MPa)Days to FailureRange DaysStress, ksi. (MPa)Days to FailureRange Days
    TH 1050100.8 (694)No failures in 746 days151.3 (1043)100 (2)**82 – 118***
    TH 105089.0 (614)No failures in 746 days133.6 (921)No failure in 746 days
    RH 950111.6 (769)30.216 – 49167.5 (1154)7.46 – 10
    RH 950110.2 (759)116(1)**165.4 (1141)51.626 – 71
    CH 900142.8 (986)No failures in 746 days214.2 (1476)No failures in 746 days


    S17700 stainless steel requires three essential steps in heat treating:

    1) Austenite conditioning

    2) Cooling to transform the austenite to martensite

    3) Precipitation hardening

    Standard heat treatments

    It presents the procedures for heat treating material in condition A to conditions TH 1050 and RH 950.

    Condition A

    For in-process annealing (mill annealing), the alloy should be heated to 1950 ± 25°F (1066 ± 14°C) for three minutes for each 0.1 in. (2.5 mm) of thickness, and air cooled. This treatment may be required to restore the ductility of cold-worked material so that it can take additional drawing or forming. Although most formed or drawn parts do not require

    re-annealing prior to hardening, annealing is required on severely formed or drawn parts to be heat treated to Condition TH 1050 if full response to heat treatment is required. Annealing is unnecessary in the case of the RH 950 heat treatment.

    Procedure from condition A to conditions TH 1050

    Procedure from condition A to conditions RH 950

    Procedure from condition A to conditions CH 900


    S17700 stainless steel in Condition A can be formed comparably to Type 301. It work hardens rapidly and may require intermediate annealing in deep drawing or in forming intricate parts. Springback is similar to that of Type 301.

    This alloy is extremely hard and strong in Condition C. Therefore, fabrication techniques for such materials must be used.


    AMS 5528 Sheet, Strip and Plate

    AMS 5529 Sheet and Strip–Cold Rolled

    AMS 5568 Welded tube

    AMS 5644 Bars and forgings

    AMS 5678 Wire

    AMS 5824 Welding wire

    ASTM A313 Spring wire

    ASTM A480 / ASME SA480 General requirements for flat-rolled stainless and heatresisting steel plate, sheet, and strip

    ASTM A484 / ASME SA484 General Requirements for Stainless Steel Bars, Billets and Forgings

    ASTM A564 / ASTM SA564 Bars, wire and shapes

    ASTM A579 Forings

    ASTM A693 / ASME SA693 Sheet, Plate and Strip

    ASTM A705 / ASME SA705 Age hardening stainless steel forgings



    (1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
    (2) 6 state key laboratories and calibration center.
    (3) Patented technologies.

    (4) Ultra-purity smelting process: VIM + IG-ESR + VAR

    (5) Excellent high performance.


    Minimum Order QuantityNegotiable
    Packaging DetailsWater prevent, seaworthy transport, mill’s export standard packing
    MarkAs per order
    Delivery Time60-90 days
    Payment TermsT/T, L/C at sight, D/P
    Supply Ability300 metric tons per month

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