A high-hardness, corrosion-resistant cast stainless steel for fluid delivery
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A technology of fluid transportation and stainless steel, which is applied in the field of high-hardness corrosion-resistant cast stainless steel, which can solve the problems of loss, thin thickness, waste, etc., and achieve the effect of hardness improvement and high corrosion resistance
Active Publication Date: 2019-06-28
LUOYANG SUNRUI SPECIAL EQUIP
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[0004] The existing technology usually solves the wear problem by partial surfacing or spraying wear-resistant coatings, but due to the high brittleness, thin thickness, high price, and high requirements on the manufacturing process of the wear-resistant layer, abnormal failures are prone to occur during actual use , leading to downtime and huge losses
Therefore, such solutions are usually not used for important fluid delivery occasions
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Embodiment 2
[0032] The chemical composition percentage of the casting is: C: 0.028%, Si: 0.516%, Mn: 0.803%, S: 0.01%, P: 0.038%, Cr: 25.8%, Ni: 4.79%, Mo: 4.1%, Cu: 2.68% ,N:0.12%
[0033] After solution treatment at 1130 degrees and hardening treatment at 850 degrees, the casting hardness reaches 43HRC.
Embodiment 3
[0035] The chemical composition percentage of stainless steel castings is: C: 0.012%, Si: 0.43%, Mn: 1.2%, S: 0.02%, P: 0.035%, Cr: 26.1%, Ni: 4.76%, Mo: 4.6%, Cu: 1.5 %,N:0.10%
[0036] After solution treatment at 1150 degrees and hardening treatment at 850 degrees, the casting hardness reaches 46HRC.
[0037] (4) Embodiment 4
[0038]The chemical composition percentage of the casting is: C: 0.012%, Si: 0.43%, Mn: 1.2%, S: 0.02%, P: 0.035%, Cr: 26.1%, Ni: 4.76%, Mo: 4.6%, Cu: 1.5% ,N:0.10%
[0039] After solution treatment at 1170 degrees and hardening treatment at 850 degrees, the casting hardness reaches 47HRC.
[0040] (5) Example 5
[0041] The chemical composition percentage of the casting is: C: 0.014%, Si: 0.35%, Mn: 0.68%, S: 0.01%, P: 0.02%, Cr: 26%, Ni: 5.2, Mo, 4.4%, Cu: 3.5%, N: 0.05%.
[0042] After solution heat treatment at 1150 degrees and age hardening at 530 degrees, the casting hardness reaches 39HRC.
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Abstract
A high-hardness corrosion-resistant cast stainless steel used for fluid transportation. The chemical composition of the stainless steel casting contains C≤0.03%, Si≤1%, Mn≤2%, S≤0.03%, P≤0.04%, Cr: 25 ~28%, Ni: 4~6%, Mo: 4~8%, Cu: 0~5%, N: 0~0.3%, the rest is Fe and unavoidable impurities, Mo / Ni range is 0.75‑1.5, PREN=(Cr+3.3*Mo+16*N)≥41; the manufacturing process is: smelting, casting, solid solution, hardening treatment, through composition improvement, the content of solid solution ferrite is much higher than that of ordinary duplex stainless steel The microstructure, duplex stainless steel phase ratio requirement (30% ~ 70%), the ferrite content of the invented material is ≥ 70%, realizes a substantial increase in the hardness of stainless steel, and further achieves high corrosion resistance and high hardness through smelting, casting, solid solution, and hardening treatments performance.
Description
technical field [0001] The invention belongs to the technical field of high-hardness corrosion-resistant stainless steel, in particular to a high-hardness corrosion-resistant cast stainless steel used for fluid transportation. Background technique [0002] Existing stainless steels include austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, precipitation hardening stainless steel, etc. Among them, except for martensitic stainless steel and precipitation hardening stainless steel, which can be strengthened by heat treatment, the rest of the stainless steel is usually in solid solution. If it is used in the normal state, the hardness is low, and it is difficult to meet the requirements of cavitation erosion and abrasive wear during fluid transportation. If medium temperature precipitation strengthening is used, the corrosion resistance of the material is usually seriously affected due to local depletion of elements due to p...
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