JPS58207357A - Alloy with corrosion resistance to molten zinc - Google Patents

Abstract

PURPOSE:To obtain a low-cost alloy with improved resistance to corrosion due to molten zinc by adding specified amounts of C, Si, Mn, Cr and Cu to Fe. CONSTITUTION:This alloy with resistance to corrosion due to molten zinc consists of, by weight, 0.05-0.7% C, 0.5-2% Si, 0.5-2% Mn, 5-25% Cr, 0.5-4% Cu and the balance Fe. Cu in the alloy composition is an element which is effective in providing resistance to corrosion due to molten zinc, and it is added by said amount causing no deterioration of the corrosion resistance and mechanical characteristics. Since the alloy contains no expensive elements, it can be manufactured at a relatively low cost. When the alloy is used as the material of a sink roll or the like used in a zinc bath in a galvanizing line, corrosion and surface roughening are not caused, so the roll can be used over a long term without requiring planing again.

Description

[Detailed description of the invention] The present invention provides excellent corrosion resistance to molten zinc.
.

Regarding alloys.

Conventionally, as melt-resistant 1F lead alloy, -1<zu composition (/
One thing is known. (The value should be below・＼-CIl
To I: % is shown) OMnSiCrNi't+1: a O,,2~0.3-1+2:1.24'~
, 2g // ~/'7 remainder -b <o, 3<
ノ <, 2. 2. s~3/ remainder ・-,
z5-c O,3~/,7-:l~,3.
! ;/S~λ/ 10~/Otsu≦9 remainder/B 7.0~3.3 W5~/Otsu d - Mi, θ, /S -27-, /, 510~/3 - remainder
−θ−/−0. ll-, 2/. S~3.53~-〇-
Remaining e-: l ll
' Remainder (At /, 0, 'i' i
/, 0, Ilb 2, W 3, Mn2, v /)
Of which j, -)i was N--1 or more 1, d is used 1f'
[ζ21') I'm scolding for corrosion resistance.

1114 I l) J'νl equipment-
ζ2niobium''!'F4-j,f;S111-,,!
, -, +1 L-ζ General (-use 11) sleeping.

11. i, −,, −) then 6X d, (2−/,
O-,! 1st 1:) 17□, fusion 11c K'r corrosion, ψ first test, Roga! ! () Shito N Ku 2 horns to 11 To,'(Mu・ta~'I JI 'r:I C
L +:':+ 1 song, σ)゛(, part 1Li-
, a, d, -;-/, 畦''-) are used in III.

But a is also 1. As mentioned above, there are many 1. t +, M no with 1'3 of Nininokeru, k), Hatake fill + although not as good as c)
It is. .

・1. e-/, e-, 2 is mostly nickel
・Although it is cheap because it does not have a structure, its corrosion resistance against molten 1111 is slightly better or on the same level as that of a. There is a desire to develop a molten lead corrosion resistant alloy for use in steel.

1. The LI objective of the invention is to provide an alloy that is more resistant to melting than the alloys listed in I.

In order to achieve this object, the present invention has particularly developed an alloy as shown in the claims.

The reason why the alloy composition of the present invention is claimed is as follows.

C2 θ, θ,; 1' to 0.7% Considering the corrosion resistance of molten zinc, it is better to keep it as low as possible, but in the case of parts that rotate in molten zinc, it is important to have resistance other than corrosion resistance. Abrasion resistance is also required first. .

In addition to wear resistance, this element is necessary to provide strength, but if it exceeds this range, it will become brittle, so it should be within this range.

Si: 0. ! ;~2% Mn: 0.3~Co% During casting, it has the effect of deoxidizing agent, improves the fluidity of the molten metal, and is an element necessary for making healthy products. . However, it is set in this range because the amount of particles contained increases.

Qr: 5-25% Similar to C, this is arsenic, which is necessary for providing wear resistance and strength. The effect of adding this element occurs from 5%, but a
As the number of 1 increases, it becomes brittle and becomes unsuitable for practical use, so 25% is limited to 4.

Ou: Q, 3; A-7% This is an element that is particularly effective in molten salivary lead corrosion resistance, and is an element lacking i+J that is not necessary to achieve the object of the present invention.

It was discovered that the effect of its addition becomes sharper from 0.5%. This point is the most distinctive feature of the present invention. However, if the addition rate exceeds 9%, the corrosion resistance and mechanical properties will deteriorate rapidly, so the limit is set at 7%.

Next, the alloy of the present invention will be explained in comparison with the conventional alloy.

Table 1 shows the compositions of the conventional alloy and the alloy of the present invention.

Table 1 Example 1 Each component of the alloy composition shown in Table 1 was blended, melted and processed, and then cut to produce a test piece with dimensions of 15w in diameter and 4ISW in length. Next, zinc lθ~ was dissolved in an experimental furnace, and the test piece was suspended therein for an immersion test. The molten metal temperature is I
ll, kept at 0-4I90C. The following two types of molten metal lines and minutes were used.

1) Pure z’n II) Zn [0.2%At The test results are shown in Table 2.

Table 2 (Condition 1I7 (7 tl'X/g for hours) Example) The zinc roll used in the zinc coating of the hot-dip galvanizing line is conventionally manufactured mainly from alloy J-/.
Corrosion or roughening occurs during use, and the surface must be re-sharpened at regular intervals. This cutting period is about 2θ[1.

When a roll was actually made with the composition of H-3 in Table 1, which is an alloy of the present invention, and subjected to a practical test, there was no need for resharpening until 10 I] had passed.

Applicant: Taihei Metal Industry Co., Ltd.

Claims (1)

[Claims] Ill +r< int%, C0,03;~0.7
%, 5lO85~,,I! , +, Mnθ, 5-z2%,
Gold that exhibits corrosion resistance to molten zinc, consisting of 5 to 23% Cu, the remainder Fe, and 3 to 23% Fe.