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Technical Introduction
1. Chemical composition (%)
C Si Mn P S Cr Mo
0.42-0.49 0.15—0.35 0.75-1.15 ≤0.025 ≤ 0.025 0.75—1.25 0.20-0.35
Cu
≤0.35
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
6. Mechanical Properties
(According to ASTMA370 and API7)(In 1” depth under the surface, room temperature):
Tensile strength ≥965N/mm2
Yield strength ≥793N/mm2
Elongation ≥15%
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 penetrated inspection or other methods.
Acceptance: There shall be free from surface defects such as cracks, scabs, folds etc. Welding repair shall be forbidden.
Stabilizer