High strength anti-corrosion easy processing and low magnetic cast steel for manufacturing ship weldable structure
A processing method and welding structure technology, applied in the direction of manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve the problems of easy generation of pores and microcracks, high manganese steam pollution, and difficulty in guaranteeing the performance of welded joints, etc., to achieve low magnetic properties Unstable energy and broad application prospects
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specific Embodiment approach 1
[0017] Formulation C: 0.05%, Cr: 10.3%, Mn: 3.0%, Ni: 2.0%, N: 0.10%.
[0018] After batching 500kg, use a 500kg intermediate frequency induction furnace to melt, cast into Kiel samples and test panels, keep warm for 0.5h at 1050°C, and cool in water. Reprocessed into samples. The measured mechanical properties of materials and welded joints are as follows:
[0019] sample
Rp0.2 / MPa
Rm / MPa
A / ％
Z / ％
Akv / J
Heat treatment sample
278
510
55.6
72.3
260
Welded joint sample
-
490～505
-
-
130～146
[0020] Through testing and comparison, the machining efficiency is 60-68% of that of 1Cr18Ni9Ti stainless steel.
[0021] After the ingot cast by the above method was machined into a corrosion sample, the corrosion rate in the 3.5NaCl solution was 1.6×10 -3 mm / a, about 2.6% of the corrosion rate of the currently used 917 (ZG45Mn17Al3) low magnetic cast steel.
Specific implem...
specific Embodiment 3
[0027] Formulation C: 0.15%, Cr: 22.0%, Mn: 12.0%, Ni: 12.0%, N: 0.28%.
[0028] After batching 500kg, use a 500kg intermediate frequency induction furnace to melt, cast into Kiel samples and test panels, keep warm for 0.5h at 1050°C, and cool in water. Reprocessed into samples. The measured mechanical properties of materials and welded joints are as follows:
[0029] sample
Rp0.2 / MPa
Rm / MPa
A / ％
Z / ％
Akv / J
Heat treatment sample
416
660
36.9
32.3
128
Welded joint sample
-
620～651
-
-
130～146
[0030] After testing and comparison, the machining efficiency is 72% to 78% of that of 1Cr18Ni9Ti stainless steel.
[0031] After the ingot cast by the above method is machined into a corrosion sample, the corrosion rate in the 3.5NaCl solution is 0.5×10 -3 mm / a, about 1.0% of the corrosion rate of the currently used 917 (ZG45Mn17Al3) low magnetic cast steel.
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