JPS58153759A - Anti-wear alloyed steel - Google Patents

Abstract

PURPOSE:To provide anti-wear alloyed steel for the chisel of a civil engineering machine capable of being corrected in the shape thereof without generating crack by gas weld cutting, constituted by specifying the contents of C, Si, Mn, Cr, Mo, W and V. CONSTITUTION:Anti-wear alloyed steel contains, on the basis of wt%, 0.30- 0.55C, 0.60 or less Si, 1.0-2.0 Mn, 1.6-2.4 Cr, 0.20-0.75 Mo, >=0.45 W and/or >=0.20 V, according to necessity, >=0.30 Nb and/or >=0.30 Ti and/or >=0.30 Zr and/or >=1.0 Ni, and comprises the remainder Fe and inevitable elements. Because this steel has such a beneficial point that uniform hardening is applied to the center part of a chisel compared to an SCM4 type material, it is excellent in anti-wear property and, because it has high temper softening resistance, it is low in the softening degree due to friction heat during use and hardly abraded. In addition, because hardness required as the chisel is obtained by gas weld cutting, re-hardening is unnecessary and it is economical because a hardening temp. when newly formed is 900 deg.C or below.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sigma alloy steel for chisel used in civil engineering machinery for rock excavation, quarrying, demolition of concrete trenches, etc.

Conventionally, as steel for tea cell, chromium-cerebdenum 1m
(SCM4) is the main material, and tool steel is also used for some applications. In this case, the copper phase is machined into a predetermined shape and then heat-treated before use. There is -Resolution-C which can be used repeatedly after modifying.

Shape modification [Toga methods include mechanical IJII machining (1, II machining) and gas cutting. When performing weaving processing, hardness is the most important factor.Since machining is difficult, hardness is the most important factor.In this case, abrasion is difficult.
r Rimata hard chi 1! °C is the cutting machining [F]
After applying the fix to the desired hardness and modifying the shape 1r-L, , A, heat treatment 1 (1) must be applied again to obtain the desired 11!!8. zu, (1 kettle 1 [work?/r9 miscellaneous - (Yes, there is a r next to the failure.

It was.

Also, when modifying the shape by cutting the gaff,
) is a preferable method because it can be done easily on site and regardless of the convenience. ~L7
Because of this, I was unable to use it repeatedly for one history, and
If the hardenability is too good, the hardness will either be achieved or cracks will occur.

On the other hand, the characteristics required for nacelle steel are g
) Excavation, Ninoncrete painting body L7 and 111I abrasion 1 cow is broken, 411 loss during use 1 is dirty, toughness is 1 豐 3-, repeated t! The necessary fatigue strength to control the Itr attack 111 times is 1, [to prevent the low 1-1 height due to frictional heat at the time of history 114 & softening ↓
In addition to this, the sutra (i superposition 1, calling from the earth f-'l cost 1, -, and the machine F precept. Easy machining (L5 has excellent machinability) and has low hardness due to scrap cutting.
There are many things that can be said to include or contain a special 1 cow.

17 for the above σ) Anshu special feature, the conventionally used S
In the CM 4 series H lesson, lQQmsφ1 peep” - large size Chi 1! When this happens, the acid that is essential to the IC will be applied to the parts, and if the 1φ layer on the surface wears out, the inside (h) will be very abraded due to its low hardness and will be easily cleaned. ,
Softening 4-1 (Due to the small resistance, the hardness is low during the first month of use, and when the shape is repaired by gas cutting,
Not only is it not possible to obtain the desired hardness, but the hardness has decreased by 1 degree, so it has to be quenched twice. The present invention eliminates the disadvantages of conventional methods [5. While taking advantage of the characteristics of gas welding, the necessary hardness can be obtained, resulting in excellent +Il polishing 1! +: For example, it has toughness, fatigue strength, and resistance to softening.
We offer a new TYSO σ) Chisel Month 4 wear-resistant alloy steel.

The steel of the present invention is @ land soil t strained C0.80 ~ 0.55 head,
5iO160% 1 liter, lVb+1.0-2.0%
, Cr 1.6-2.4%, M.

0020~0.75 kesa, W 0.45% or more 1., Vo
, 20% 1 point] and 10, if necessary, NIl,
'r'i, Z "one or two of the following" - mixed with 0.30 chili each containing Ni l, Q soi 1. = C, cracking occurred due to gas welding. Something to do (,
HsC451J, -, 1I11 wear alloy 1k) which provides a hardness of h).

In other words, the steel of the present invention has a yield ratio of the conventional SCM4 series.
T-chee→! 1 koi is evenly baked up to 9 parts of the inside of the container.
111 Excellent abrasion resistance, tempering softening, II-
(Since the pile is large, the degree of softening due to frictional heat during use is small, and it is difficult to wear and tear. +-C, f-+=
Since the necessary hardness can be obtained with R and 1, there is no need for quenching for μ), and in addition, the IIA temperature when making cicadas is 90 (
1°C, 1; J, '1', and has the advantage of being economical.

■Reasons for limiting the composition of the steel of the present invention [I will explain the trick.

C is an element that is safe to obtain the necessary hardness through quenching and simultaneously form a carbide to improve wear resistance.
be. Hardness required for tea cell) 1RC451, J,
To obtain 1, it is necessary to contain 0.30 or more.

However, as the CB increases, the hardness increases, the toughness decreases, and the risk of breakage increases during one use, so the upper limit is set to 0.
, 55 inches.

Since Sl decreases annealing hardness and impairs machinability, it is preferable to have a small amount, and because it raises the transformation point (the quenching temperature must be increased).

Since the quenching work is complicated, the upper limit is set at 0.60% and 17. In addition, if the quenching temperature is 9001: or higher in the -F row, the quenching cost at the time of the new high-quality cell will increase, making it more economical.
There is C. For this reason, it is essential that the quenching temperature be 90°C (1"C or higher).

IVl++ is an element necessary to improve the hardenability, make the hardness distribution of the cross section uniform, and improve the wear resistance.
It is an important element in order to improve the convenience of R by 11+.

1.0% end 11:1-Is it the Z OJ effect? If it exceeds 2.0%, there is a danger that 1 crack will occur when the sludge is fused. It was the head.

N1 has the same effect as Mu, and) θ''171
, θ) is added to improve the fatigue strength and prevent rain breakage of the tea cell σ). This effect increases with the addition amount 2, or when it exceeds 1.0 inch, the common hardness υ) is low 1. Sa2)
The upper limit for machinability is 1.0%.

Cr forms carbides and improves anti-wear properties, as well as uniform hardness distribution and stiffness.
It has an effect of 19% on softening caused by passion and heat during use, and is an important element in the present invention. To obtain this effect, it is necessary to contain 1.6 pieces more.

Moreover, if it exceeds 2.4%, the quenching temperature will rise, the quenching process will become unsophisticated, and it will become impractical, so the upper limit was set at 2.4%.

iVlo has uniform hardness distribution and strength direction similar to CI.
1-7- In addition to improving 111I wear+<1 and increasing softening resistance, it also has the effect of increasing This effect cannot be obtained with 0.20% end 2r'i'7, but with (1,75% jl #li
Since there is a risk of cracking occurring when the gas bath is cut off, the upper limit is set to 0-75φ, and 1W and ■ increase the resistance to 11φ ζ and form I carbide, which improves wear distribution. Big U ", Riki Shuga Le, Rui Shiko, W
, Vσ) Fine and stable carbides have the effect of reducing the coarsening of the structure of the heat-affected zone by 1υJ due to rough fracture.

Even if W exceeds 0145chi and ■ exceeds 0.20chi, the effect σ
Since the improvement is small, the second limit is Wo, 45%, Vo
, 20 axes.

Nb, Ti, and Z+ are strong carbide-forming elements, and W
, Same as ■ (element that improves r11il wear resistance)
Car, Ru1゜The effect is much greater than that of W and V, and when it is used for a lifetime under harsh conditions, and when the diameter of the cheese cell is large, the addition of pJ L+, Ti, and Zr becomes Peace of mind 4...

Nl+, Ti, and Z+ each have 0.30% +t'! f
Even if the effect is 7 or less θ), its upper limit is 0.
．． 30 φ and / this.

The characteristics of Pl according to the present invention will be clarified by comparing it with conventional steel and comparative steel in the Examples.

Table 1 shows the results of polishing these test steels with a substance that impairs their chemical composition.

Table 1 In Table 1, the -H steel is the invention steel, the A-C steel is the first invention steel, the D and H steels are the second invention steel, and the F and ()' steels are the third invention steel. The invention steel, H steel, is the fourth invention steel, J and Ni scrap are comparison steels, L distance +: L Ll second steel and S CM 4.

Table 2 shows the test steels A to L in Table 1. This is the result of investigating the surface hardness distribution of the fusion cross section of the sword and the state of fusion cracking.

It is clear from Table 2 that the surface hardness of the welded cross section in Table 2 is the steel of the present invention, A to II, and the deviation is the lowest.
J steel, which is a comparative steel, has a hardness that is twice as strong as C45, and has a hardness that can withstand use in gas-cutting soil conditions. Necessary IVI +1
However, since it does not contain MO, its (convenience) is HhC32, and the conventional steel, Shichihagane, has an HRC of about 38 even with 1 acid, so if it is gas-fused, it will not be suitable for use. However, if used in this condition, it will wear out early, so it must be hardened and +S stapled before use, and the conventional steel SCM4 requires in-situ C gas fusion cutting (repairing the shape of the staple). iE is only -C.

In addition, the comparative steel contains necessary amounts of Mu, Cr, and Mo.
Cracking occurred, and it was impossible to modify the shape by gas cutting.

On the other hand, all of the steels A to H of the present invention exhibit excellent properties as steels for J-cells that are used as they are in the slag bath.

In this way, by modifying the shape of the fusing part of the present invention B'111, it is possible to obtain a hardness that can withstand RC45 or higher and one-time use. Therefore, it is easy to modify the shape on-site, and it is a steel for adjacent steel.

Table 3 shows the results of quenching and annealing to improve wear resistance and toughness after hardening.

Quenching temperature: The minimum width necessary for the test steel to be hardened by acid. The quenching hardness Q of each test piece of paulownia was determined so that the gas fusion cutting hardness could be obtained by increasing the firing temperature and ζ.

Table 3 1 Wear resistance index, toughness index t), 'C), and U are all compared with 5CIVI4, which is the conventional MI, as 100. Wear resistance Q: A, 1), K steel, which is a problem with the present invention, is conventional L steel, and comparative steel J.
It is known that it has approximately twice the performance compared to steel, has excellent wear resistance, and has a longer lifespan.
The toughness is 7% according to the present invention. A, D, and F have high hardness, but compared to the conventional 1jllL! 14J
It is known that the performance is equivalent to or even better than that of the steel, and that the toughness is good even if the toughness is less. Also, K steel is 1000
The desired hardness cannot be obtained unless quenched at a high temperature of 'CLIJ, l.

Thus, the steel of the present invention is a steel for tea cells with excellent wear resistance that can improve wear resistance without deterioration of toughness.
be.

The steel of the present invention has a series of adhesives (11 < 1) compared to the conventional 17'18 CM4 +A series, which has excellent abrasion resistance because it is evenly pierced down to the center of the steel, and has excellent abrasion resistance. Due to its low resistance, the degree of softening caused by frictional heat during use is small, making it less likely to wear out.Furthermore, the required hardness as a tea cell can be obtained by gas cutting, making it easy to modify the shape on site. It is highly practical as steel for chiseling, which is used for rock excavation, concrete structure demolition, etc.

[Brief explanation of the drawing]

Fig. 1 shows the shape of the material under force L[+1t+, and Fig. 2 shows the shape of the material with the force L [+1t+], and Fig. 2 shows the shape of the material which has been processed into a predetermined shape by gas cutting and cumbersome processing. Patent applicant Aichi Steel Co., Ltd. Figure 12

Claims (1)

[Claims] 1, K ratio+=LteCO, 80-0,55%, S
i 0.60% 1 min, Mu 1.
0-2.0%, Cr' 1.6-2.4%,
M o O, 20-0, 75'#t, W 0.4
5'1-DJ, Hoshi, VO, 20961d) 0) A wear-resistant alloy steel characterized by containing one or two of the following, with the balance being Fe and the remainder consisting of pure redundant elements. 2. Weight ratio t to t, techo, ao-0.65%, S
i 0.60% or more T-', Mll 1.0-2.
0%, Cr 1.6-2.4%, MOo, 20-0.
75%! = , W 0.45961J lower, V
Contains one or two of O, 20% or more F, dry Nb O, 80% moon-dried, 'I'i 0.808
A ml wear alloy steel characterized in that it contains 1 to 1 to 2 types of IJ and 0.80% or less of Zr and 0.80% or less, and the remainder is Fe, which is an impurity element. 3. Ratio of weight &n c O, 80-0, 55%, SI
O, 60% IJ, l', IVI o 1, 0-
2, 0%, csh 1.6-2.4%, IVIo
O,20△0.75%z! :, W 0.45≠F
', VO, 20% It is characterized by having one or two of the following, furthermore containing Q, Ni 1.0%, J, and the remainder consisting of Fc and t impurity elements. Wear-resistant alloy steel. 4. C0.3F1-055% by weight, Si0.
60% 1 So, [Pa, Mn 1.0-2.0%, Cr
1.6-2.4φMo O, 20-0,75φ,
Wo, 45φ or less, Vo, 20% dried σ), contains one or two types of yuzu, smooth Nb-OJ 0% IJ
, "h'. Contains one or more of Ti (L30φ or less, Zr 0.80% or more - F), Ni 1.0φ or more, and the remainder consists of impurity elements of 1"C and t. Wear-resistant alloy steel featuring