SUS329J4L HEX BOLT M16x35

30/10/2020 15:10 เมื่อ 30/10/2020 เข้าชม 569
 
SUS329J4L HEX BOLT M16x35
 
  • ราคา : 500.00 ฿
  • รหัสสินค้า : HB329J4L-M16-35
  • ยี่ห้อ : JAPAN BRAND
  • รุ่น : SUS329J4L
  •  
    • SUS329J4L Duplex Stainless Steel Bolt
      Cold Forged FA Hex Bolts


      Duplex Stainless Stell Bolt Nuts Cold Forged FA Hex Bolts

      The material is stainless steel wire made by Nippon Steel Stainless Corporation. Since SUS329J4L was not standardized in JIS G 4308 'Stainless steel wire', the steel grade name of the steel inspection certificate (mill sheet) is 'S329J4L'.


       What is Duplex Stainless Steel?

      Stainless steel in which a ferrite structure and an austenite structure coexist.
      It is also resistant to corrosion, crevice corrosion, and stress corrosion cracking in a chloride environment, and is significantly superior to SUS316. Since it is stronger than SUS304 and SUS316, it can be designed to be lighter.

       

       Chemical composition (typical example) and pitting corrosion resistance index (PREN) (reference value)

       

      C

      Si Mn Cr Ni Mo N Cu PREN

      SUS329J4L

      0.01 0.50 0.70 24.90 6.80 2.80 0.12 0.20 36
      SUS316L 0.02 0.53 0.88 17.42 12.07 2.04 - - 24
      SUS304 0.01 0.37 1.76 18.07 8.02 - - - 18

      PREN (Pitting Corrosion Index) = Cr% + 3.3Mo% + 16N%

       

       Corrosion resistance (Source: Nippon Steel Stainless Steel Corporation)

       

       Mechanical properties of bolts

      Steel type classification

      Strength classification

      Tensile strength
      N / m㎡

      Permanent elongation 0.2%
      proof stress N / m㎡

      minimum

      minimum

      FA

      80

      800

      600

      Measured value Size: M16 × 70 × 38

      1092

      865

       

       Stress corrosion cracking resistance

      Although SUS304 or SUS316, which is an austenitic stainless steel, has superior performance to carbon steel in the general air environment, it comes into contact with seawater in which chlorine ions are present, and chlorine ions (Cl- In an environment where) is concentrated, the performance may not be sufficient in terms of durability. Specifically, there have been reports of stress corrosion cracking in stainless steel hexagon bolts used in heated pool sheds (environments where Cl-exists). SUS329J4L steel FA80 hexagon bolts have much better stress corrosion cracking resistance than SUS304 and SUS316 steel hexagon bolts.

       

       Corrosion comparison test (reference)

       
      Figure 1   Figure 2

      [1] Put 12% sodium hypochlorite solution in the water tank (amount is optional)
      [2] Warm with a heater from the outside of the water tank to promote corrosion (35 °C setting) 
      [3] SUS304 plate and SUS329J4L plate ( Stack two M10 drill holes + grooved),

      tighten with a bolt + nut combination specified torque, install in the water tank so that it does not touch the solution, and cover it (Fig. 1)
      [4] Saturated saline solution (500 ml at the start of the company ), Soak each sample in the same timing, warm it to about 80°C, and return it to the water tank after 8 hours (Fig. 2).
      [5] When returning the sample, put 12% of sodium hypochlorite solution in the water tank (Any amount)

       

       650 hours, after 1000 hours

       

      650 hours

      Bottom ← Beaker → Top

      1000 hours

      Bottom ← Beaker → Top

      A: 304J3

      B: 304
      C: 316L
      D: 329J4L
       

       Test combination and tightening torque

      M10 × 35 Bolt / Nut Material Board material Tightening torque (N ・ m) Estimated axial force (kN)

      A

      SUS304J3 SUS304 70 26.1
      B SUS304 SUS304 70 26.1
      C SUS316L SUS304 62 20.3
      D

      SUS329J4L

      SUS329J4L

      133

      31.3

     
     

     
 




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