First, API2HGR50 steel sheet introduction:
API2HGR50 is carburized steel, carburized steel is usually a carbon content of 0.15%-0.24% of low carbon steel, API2HGR50 is the implementation of the United States standard Marine structure with carbon manganese steel plate, this grade of steel plate has better wear resistance and corrosion resistance, so it is more used in the production of offshore platforms and hull and other engineering projects manufacturing and use. API2HGr50 Marine steel sheet heat treatment delivery, chemical composition and mechanical properties reliable guarantee
Second, the chemical composition of API2HGR50 steel plate:
Only the five elements of the steel plate are explained;
1, Silicon Si: 0.17 ~ 0.37%;
2, manganese Mn: 1.00 ~ 1.30%;
3, chromium Cr: 0.80 ~ 1.10%;
4, sulfur S: ≤0.035%;
5, P: ≤0.035%;
Third, API2HGR50 steel plate mechanical properties:
Yield strength: 735MPa;
Tensile strength: 930MPa;
Elongation: 10%;
Section shrinkage: 45%;
Impact power: 47J;
API 2HGR50 steel plate is suitable for external carburizing and hardening treatment, with excellent processability, small processing deformation, and very good anti-fatigue function. Used to make hull, offshore oil production channels, channel pipe contacts and other structural parts.
Five, API 2HGR50 steel plate improved thickness direction function of low sulfur steel:
Sixth, through chemical manipulation methods to supply low-grade sulfide doped steel plates, and then reduce the possibility of lamination tears in the joint weld area of the steel plate, the large sulfur content should be 0.006% trademark suffix xls, x refers to g, n, qt.
The low nitrogen content of improved notch tolerance under age-strain condition and the maximum nitrogen content of melting analysis is 0.009%.
Notch resistance requirements at lower temperatures: drop hammer test at -67°f(-55°c) 'no break' or Charpy impact test.
Seven, API2HGR50 is a good mechanical properties of carburized steel, hardenability is relatively high, after carburizing quenching with a hard and wear-resistant surface and tough internal, and has a high low temperature impact toughness, weldability is also better, good cutting performance after normalizing. It is widely used for carburizing parts with small cross section and high load tempering parts with large cross section, such as gear, shaft, spindle, worm, friction wheel of transmission device, etc.
