Fe-Cr-Ni alloy of golf club head

Abstract

An Fe-Cr-Ni alloy of a golf club head includes 13.5-14.5wt% of Cr, 3.5-4.8wt% of Ni, 0.02-0.15wt% of C, 0.02-0.15wt% of Ti, 0.02-0.15wt% of N, 0.02-0.25wt% of Al, 0.2-1.2wt% of Mn, 0.2-1.2wt% of Si, and / or 1.5-3.0wt% of Cu, and the balance Fe and other inevitable impurities generated in the alloy material casting process. The Fe-Cr-Ni alloy undergoes high-temperature normalization treatment after the casting operation to obtain a tempered martensite structure matrix and a microstructure containing a tiny amount of alumina and a titanium carbide stable phase. The golf club head made through using the Fe-Cr-Ni alloy has the advantages of simple making process, no need of any ageing treatment, good strength, good elongation rate, and no rust.

Description

technical field [0001] The present invention relates to an iron alloy, in particular to an iron-chromium-nickel alloy for golf club heads. Background technique [0002] Golf clubs are mainly divided into woods, irons, and putters according to their uses. Among them, woods are mainly used for tee shots, and the requirements for hitting far, straight and with a low hitting error rate are the requirements. Therefore, the club head of the wooden club is basically developed towards a large size, so as to expand the effective hitting area and reduce the weight. Because titanium alloy has the characteristics of high specific strength and low specific gravity, it can make the sweet area of ​​the club head larger and maintain directional stability, so it is a commonly used material for wood club heads; in addition, it is also used for fairways, for example. For long-distance fairway woods, the size of the club head is relatively small, and stainless steel is generally used. [0003...

AI Technical Summary

Problems solved by technology

[0012] The second category is non-stainless steel series, including carbon steel and low alloy steel, distributed in Figure 4 The left side of the oblique line L; it is characterized by good castability, soft material and easy turning processing, easy to adjust the angle of the shaft (±2 degrees), and good impact feeling, so it is currently the most commonly used material for golf iron heads. But because it is easy to rust, additional surface treatment must be carried out to increase the corrosion resistance of the club head

[0013] The third type is hardened stainless steel, which has high strength and can be used especially for the striking surface of iron club heads, and is not easy to deform. At present, AM355 and 450 with high strength are common, which can be used for the striking surface of club heads, and low-strength stainless steel. 255 and A168, the elongation is about 18-22%, easier to process

[0014] The fourth type is martensitic series stainless steel, the typical alloy is 431, its main features are no rust and low price, it is usually applied after annealing and softening, its disadvantage is that the original martensite structure with high hardness is annealed After the tensile strength is greatly reduced

[0015] To sum up the above, the current development of golf iron club heads is mainly towards alloys with both strength and elongation, and corrosion resistance. However, the current manufacturing process must be performed after alloy casting, such as tempering, aging treatment, and precipitation treatment... And other operating procedures to obtain the required tensile strength, elongation, corrosion resistance iron club head characteristics, and the control of the heating and cooling process is also relatively complicated, which makes the overall process time longer and less efficient

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