Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1990-07-03
1992-05-26
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
148151, 148419, 148442, 118419, 118423, 428602, C25C 700, B32B 330
Patent
active
051164310
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an immersion member for hot dip galvanizing bath and a method for preparing the same.
More particularly, the present invention relates to an improvement in the corrosion-resistant and abrasion-resistant properties of a roll to be immersed in a hot dip galvanizing bath, such as a sink roll or a support roll, or a constituent member thereof and also to stabilization of the quality of such a member. The present invention realizes an improvement in the corrosion resistance and abrasion resistance of a sink roll, a support roll or a bearing part or the like thereof in a hot dip galvanizing bath containing up to 5.5% by weight of Al as a bath content and stabilization of the quality thereof.
2. Background Art
Heretofore, a roll, a bearing part or the like to be used in a hot dip galvanizing bath has been produced by using a special stainless steel as its base material and flame-spraying a Co-based self-fusing alloy and a carbide cermet on said base material. However, the material thus produced is poor in corrosion-resistant and abrasion-resistant properties and inferior in stability of quality, and it tends to often cause abnormal corrosion or peeling of the flame-sprayed layer during use. Accordingly, the conventional immersion member is defective in that its life is short, and especially in case of a sink roll, this defect is serious because the working conditions are severe so that it is eagerly desired to overcome this defect. Moreover, the use of this sink roll results in a further disadvantage of formation of flaws on a product obtained by hot dip galvanizing process.
DISCLOSURE OF INVENTION
It is a general object of the present invention to eliminate the above-described defects of an immersion member to be used in a hot dip galvanizing bath.
It is a specific object of the present invention to provide an immersion member of the above kind which is superior in corrosion-resistant, abrasion-resistant and peeling-resistant properties and has a stable quality under severe conditions.
It is another specific object to provide a method for preparing an immersion member of the above kind in effective manner.
1. The present invention provides an immersion member for a hot dip galvanizing bath, which has a flame-sprayed surface layer comprising 1.0 to 1.5% by weight of C, 2.0 to 4.0% by weight of B, 2.0 to 4.0% by weight of Si, 1.0 to 6.0% by weight of Fe, 10.0 to 16.0% by weight of W, 5.0 to 21.0% by weight of Cr and 10.0 to 15.0% by weight of Ni, with the balance being Co.
2. The present invention provides an immersion for a hot dip galvanizing bath, which member has a flame-sprayed surface layer. The flame-sprayed surface layer comprises 1.0 to 1.5% by weight of C, 2.0 to 4.0% by weight of B, 2.0 to 4.0% by weight of Si, 1.0 to 6.0% by weight of Fe, 10.0 to 16.0% by weight of W, 5.0 to 21.0% by weight of Cr and 10.0 to 15.0% by weight of Ni, with the balance being Co, is formed, and then, the flame-sprayed surface layer is heated at a temperature-elevating rate of 10.degree. to 100.degree. C./hr, is maintained at a pre-heating temperature of 300.degree. to 600.degree. C. for at least 0.5 hour and is subjected to a fusing treatment by heating at a temperature of at least 1000.degree. C. for up to 30 minutes once or twice, the temperature is dropped, a soaking treatment is carried out at a temperature of 500.degree. to 800.degree. C. for at least 1 hour and a cooling treatment is then carried out at a temperature-dropping rate of 10.degree. to 50.degree. C./hr.
3. The present invention also provides a sink roll for a hot dip galvanizing bath, which has, on the surface thereof a groove having a shape characterized by a groove depth of 0.5 to 5.0 mm, a groove width of 5.0 to 10.0 mm, a groove bottom radius of at least 5.0 mm and a groove shoulder radius of at least 3.0 mm, and has a flame-sprayed surface layer comprising 1.0 to 1.5% by weight of C, 2.0 to 4.0% by weight of B, 2.0 to 4.0% by weight of Si, 1.0 to 6.0% by weight of Fe, 10.0 to 16.0% by
REFERENCES:
patent: 3035934 (1962-05-01), Cape
patent: 3642519 (1972-02-01), Tiner et al.
Patent Abstracts of Japan, vol. 5, No. 188 (C-81) (860), Nov. 27, 1981, 56-112444.
Patent Abstracts of Japan, vol. 3, No. 91 (C-54), Aug. 3, 1979, 54-69529.
Patent Abstracts of Japan, vol. 5, No. 114 (C-64) (786), Jul. 23, 1981, 56-51562.
Mizunuma Michiyoshi
Okuzaki Yuuji
Suhara Michinori
Takagi Masaaki
Tashiro Kuro
Taiyo Steel Co., Ltd. & Nippon Steel Hardfacing Co., Ltd.
Wyszomierski George
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