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      Stabilizer Forging

The Technique Requirement of 4145H Steel                                                   

1.    Chemical composition (%)                                                         

 4145H MOD

C

Mn

Si

P

S

Cr

Mo

Cu

Ni

AI

0.42-0.49

0.90-1.25

0.15-0.35

≤0.025

≤0.025

0.95-1.35

0.25-0.35

≤0.35

≤0.25

≤0.050

 

2. Smelting    method: EAF+LF+VD                                           

3．Forging: The forging ratio shall be not less than 3.0. The shape of forgings shall be according to the requirement of the drawing (rough turned forgings). 。   

4. Heat treatment: Quenching & Tempering                                                                 

5. Machining:                                                                     

      According to the drawing, the externality and dimensions must meet the requirement of the drawing. External surface area: Ra 3.2; Internal surface: Ra 6.3—12..5

per6. Mechanical properties  (according to ASTMA370 and API7)(in 1” depth under the surface, room temperature):

      Ten       sile strength           ≥931N/mm2                                                                  

      Yield strength        ≥759N/mm2                                                                    

      Elongation             ≥13%                                                                    

      Reduction of area         ≥45%                                                                     

      V type notch, radial, notch direction: radius direction:  40Ft/Lbs (≥54J)    

7.    Hardness:                                                     

     Surface hardness: 285-341HB (respectively measuring one point in 300mm from both sides)

     Under surface 1“hardness：285-341HB

8.    Ultrasonic test ：As per ASTM A388                                                                    

9. Surface defects                                                      

     After final heat treatment and machining, the surface defects shall be checked for each stabilizer.

    Test methods: Magnetic test or liquid penetrant inspection or other methods.

  Acceptance: There shall be free from surface defects such as cracks, scabs, folds etc.     Welding repair shall be forbidden.
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