JPS58207352A - Cast ni alloy for guide shoe - Google Patents

Abstract

PURPOSE:To obtain a cast Ni alloy for a guide shoe with improved resistance to thermal shock, corrosion at high temp. and wear at high temp. by adding specified amounts of C, Cr, Fe, W, Mo, Co, Ti and Al as basic components. CONSTITUTION:This cast Ni alloy for a guide shoe consists of, by weight, 0.55- 2% C, 10-28% Cr, 1-30% Fe, 0.1-10% W, 0.1-10% Mo, 1-8% Co, 0.01-4.5% Ti, 0.01-4.5% Al and the balance Ni with inevitable impurities. To the alloy may be added 0.1-3% Si or 0.1-3% Mn together with at least >=1 kinds among 0.005-0.2% N, 0.01-1.5% Nb and/or 0.01-1.5% Ta, and 0.001-0.2% B and/or 0.001-0.2% Zr. When the alloy is used as the material of the guide shoe of an inclined hot rolling mill, it shows superior performance stably over a long term.

Description

[Detailed Description of the Invention] This invention has particularly excellent thermal shock resistance, high-temperature corrosion resistance, and high-temperature wear resistance, and can be used as a guide/knee for a hot tilt rolling mill for manufacturing seamless steel pipes, which requires these properties. This relates to an N1 base casting alloy suitable for! In general, a hot tilt rolling mill has six barrel-shaped tilt rolls placed at the top position, side knees placed at left and right positions, and a plug placed at the center of the front surface. A round billet heated to 1250°C is supplied and hot-pierced and rolled by the barrel-shaped inclined rolls and flags to produce a seamless steel pipe.In this case, the raw pipe is formed into an elliptical shape. However,
A guide shoe is provided to adjust the outer diameter and wall thickness of this raw tube to a constant value.

Therefore, as the raw tube rotates forward in a spiral, it slides on the surface of the guide shoe and comes into contact with the raw tube heated to a high temperature. It will be exposed to repeated rolling and sliding friction under high stress loading conditions.

Conventionally, in order to manufacture guide shoes that are used under such harsh conditions, high Lr(i) materials such as Fe-23%Cr-3%Nl and Fe-26%Cr-2%Ni are used ?J
+ Heat-resistant and wear-resistant alloy steel and %Fe-1%C-20%CI-
・.

%Ni-5%Co-54Cu system or Ni-1%C-'i
Casting alloys such as b%1°1-5'% Mo-based alloys are used, but some of these alloys are susceptible to scale and other problems that occur on the surface of raw pipes heated to high temperatures due to lack of high-temperature corrosion resistance. The steel pieces may seize on the surface of the steel pipe, causing flaws on the surface of the steel pipe and reducing production yields.Also, some pipes cannot withstand the thermal shock caused by repeated localized high-temperature heating and water cooling. These guide shoes have the required combination of thermal shock resistance, high temperature corrosion resistance, and high temperature wear resistance. At present, the alloy has not yet been developed. From the above-mentioned viewpoint, the present inventors conducted research to obtain a cast alloy that has all the characteristics required for a guide shoe for a hot tilt rolling mill for seamless steel pipe manufacturing.
C: 0.55 to 2%, Cr: 10 to less than 28%, Fe
: 1~30%, W: 0.1~LO Taro, 14c
): 0.1 ~ 10 Sauce, C,,:
1 ~ 89shi, Tl:, rl, ol ~ 45%, Aff
i: 0.01 to 4.5%, and if necessary St:
Contains 0.1 to 3% or Mn: 0.1 to 3%,
Furthermore, if necessary, fJ:o, 005~02%, N
b: 0.01-1.5% and 'I'a: 0.0
1 to 1.5% of one or two kinds, and B: 0. OO
,L~'0. '2% and Zr: 0.001-0.2
%, and the remainder is Ni and unavoidable impurities (weight %). It has excellent properties such as high temperature corrosion resistance, high temperature corrosion resistance, and high temperature wear resistance, and therefore, when used as an ID shoe for hot tilt rolling mills that require these properties, it is said to stably exhibit excellent performance over an extremely long period of time. I gained knowledge.

This invention was made based on the above knowledge, and the reason why the component composition range was limited as described above will be explained below. - (a) C The C component dissolves solidly in the matrix at high temperatures, while...1゜W
, Mo, Ti, Nb, and Ta are combined to form carbides such as "?"3+MC and M23C6 types, thereby improving strength and hardness. As a result, in addition to excellent wear resistance, If the weldability and castability are satisfied, the desired effects cannot be obtained in the above-mentioned effects, while if the content exceeds 2, not only will more carbide precipitate, but the grain size will become coarser and the toughness will deteriorate. The content was determined to be 0.55 to 2% because the temperature decreases and the thermal shock caused by rapid heating and cooling cannot be withstood.

(+31 Cr In the Cr component, a part of it dissolves in the base material, and the remaining part forms carbide to improve the hardness of the alloy, thereby improving high-temperature wear resistance and high-temperature corrosion resistance. However, if the content is less than 1 part, the desired effect cannot be obtained, and on the other hand, if the content is -28 parts or more, the thermal shock resistance will decrease. 10～
It is set at less than 28%.

((:) F'e Fpa・, component exhibits the same 1'1 effect as Ni when contained in a predetermined amount, so it is used as a partial substitute for the expensive Ni component for the purpose of cost reduction. It is contained as,
If the content is less than 1%, the economic effect is not sufficient;
If the content exceeds 1%, the high temperature strength will decrease, so the content was set at 1 to 30%.

(d) W The W component not only forms a solid solution in the matrix together with Mo, but also combines with () to form carbides and has the effect of improving the high-temperature strength, high-temperature hardness, and high-temperature wear resistance of the alloy. If the C content is less than 1.1%, the desired effect cannot be obtained, while if the content exceeds 10%, the wear resistance will improve, but on the other hand, the toughness and heat resistance will deteriorate. Since the amount of a becomes significant, the amount of a is set at 01 to 10%.

(e) M.

As mentioned above, the Mo component is a solid solution in the base material in coexistence with W, strengthening it and forming carbides to improve the high temperature strength, high temperature finesse, and high temperature wear resistance of the alloy. However, if the content is less than 0.1%, the desired effect cannot be obtained, while if the content exceeds 10%, the toughness and thermal shock resistance deteriorate as in the case of W. Therefore, the content was determined to be 01 to 10%.

(The rl Tt I1111 portion not only suppresses the growth of crystal grains in the base material, but also makes the crystal grains finer, and combines with MC type carbides and nitrides, as well as Ni and M, to form Ll 1
-3 (Al, 'Ti) has the effect of forming intermetallic compounds to improve high temperature strength, high temperature wear resistance, thermal shock resistance, and toughness, but if the content is less than 0.0 part Ti, If the desired effect is not obtained and the content exceeds -45%, the formation of carbides at high temperatures is promoted and the toughness of the alloy is reduced, and furthermore, the formation of oxides at high temperatures becomes significant. Since it causes deterioration of high-temperature corrosion resistance, its content is set at 0.001 to 4.5%.

The constant I At At component improves oxidation resistance and corrosion resistance at high temperatures when coexisting with Cr, and furthermore, as mentioned above, it combines with Ill and 1゛1 to form Ni3 (AP,,'l['i
) (D In addition to forming intermetallic compounds, nitrides are formed to further increase high-temperature strength and wear resistance, and have the effect of improving thermal shock resistance and toughness, but their content is less than 0.01%.) In this case, the desired effect cannot be obtained from the above action,
On the other hand, if the content exceeds 4.5, the fluidity and castability of the molten metal will decrease, making manufacturing difficult, and the toughness and weldability will also decrease, making it less suitable for Otsuki. The content was determined to be 0.01 to 1:).

(h) The 5i Si component, together with Cr, has the effect of improving high-temperature corrosion resistance, and also has the effect of deoxidizing and improving the fluidity of molten metal to improve castability, and also has the effect of improving high-temperature strength. Therefore, if the characteristics of fLI-r are particularly required, it may be included as necessary, but if the content is
If the content is less than 0.01%, the desired effects cannot be obtained in each of the above actions, while if the content exceeds 3%, the toughness and weldability will decrease in relation to Cr9. was set as 01-3chi.

In addition, the Si component may be contained as an unavoidable impurity in a range of less than 0.1% when it is used as a deoxidizing agent, but in this case, including the content of unavoidable impurities, The total content may be 0.1% or more.

(The 11L!nt, b+ acid component, together with 171, stabilizes austenite by solid solution in the base material, and has the effect of improving thermal shock resistance and high-temperature wear resistance, and also has a deoxidizing effect. It is contained as necessary when these properties are required, but if the content is less than 11%, the desired effect cannot be secured, while if it is contained in more than 3%, high temperature corrosion resistance The content was determined to be 1J] to 3%, since this may cause deterioration of the content.

In addition, 1. (Similar to the Sl component, the n component may also be contained as an unavoidable impurity in a range of less than 0.01%, but in this case as well, the overall content line, including the unavoidable impurity content, is 0.1%.
All you have to do is adjust the ingredients so that the percentage is higher than that.

(,]) C.

The component has the effect of improving the oxidation resistance and thermal shock resistance of the alloy by being dissolved in the base material, but if the content is less than 1, the desired excellent acid resistance and thermal shock resistance are lost. However, even if more than 8 pieces of horn were contained, no further improvement effect was observed due to the above-mentioned action. Considering economic efficiency, the content of butterbur was set at 1 to 8%. .

(]<l N The N component has the effect that a part of it dissolves in the austenite matrix and stabilizes it, while the remaining part forms metal nitrides and further improves the high-temperature strength. So,
It is included as necessary especially when high temperature strength is required, but if the content is less than 0.905%, no further effect of improving high temperature strength can be seen, while if it exceeds 0.2% If it is included, not only will the amount of nitrides increase, but also coarsening will occur where the amount of nitrides = 1', resulting in embrittlement and deterioration of thermal shock resistance.
It was limited to L%. (7) Nb and Ta These components particularly suppress the growth of crystal grains in the substrate,
In addition, it forms MO-type carbides and nitrides and has the uniform effect of further improving high-temperature strength and high-temperature wear resistance, so it may be included as necessary when these properties are particularly required. However, the content is 0
If it is less than 0], the desired effect cannot be obtained in the improvement effect,
On the other hand, if each content exceeds 1.5, it will cause deterioration of high temperature corrosion resistance such as significant oxidation of oxides at high temperatures, and furthermore, the formation of too many carbides will lead to deterioration of toughness and thermal shock resistance. Therefore, the respective contents were determined to be 0.0% to 15%.

(-B and Zr The ingredients of konera include high temperature strength and high temperature abrasion resistance.

Since it has a uniform effect of further improving thermal shock resistance and high-temperature corrosion resistance, it can be included if necessary, but if the content is less than 0001%, the desired improvement effect cannot be obtained; If the content exceeds .2%, toughness, thermal shock resistance, castability and weldability will deteriorate, so the respective contents should be reduced to 0.000%.
It has been designated as Sections 1 to 02.

Next, the cast alloy of the present invention will be explained using examples and comparing with comparative examples.

EXAMPLE Using a conventional high-frequency melting furnace, molten metals having the compositions shown in Table 1 were analyzed, and then cast into sand molds to obtain 4\Komyo Casting Alloys 1 to 4.
62. Comparative casting alloys 1 to 1 and conventional casting alloy 1
．． Seven J1 and 11 test pieces of 2 were manufactured and hardness measurement tests were conducted using these test pieces.

Charpy impact test at room temperature, Okoshi type metal-to-metal wear test.

And thermal shock tests were conducted under conditions similar to the repeated rapid heating and rapid cooling of the actual machine. .

In addition, the hardness measurement test was performed at room temperature, 900°C, and ], 0
This is carried out by measuring the Vickers hardness at 00°C, and the Okoshi type metal-to-metal wear test is carried out using a mating material: S U
J-2 (HRC: 57 or more), load 1d, kg
, friction velocity: 0.083 m/sec,
The test was carried out in a dry state for 71 days, and the specific wear amount was calculated from these results. Furthermore, the thermal shock test was conducted using 1, in which a spherical concavity with a diameter of 10 mm was formed at the center of the -j end surface.
□Using a prismatic test piece with 2 x 30 mm resistance,
The spherical concavity of this test piece was heated with oxygen-propane using a spanner for 30 seconds to bring the temperature to about 900°C, and then immediately sprayed with water for 20 seconds to bring the temperature to about 20°C.
The step of bringing the temperature to 0° C. was defined as a cycle, and this was repeated, and the spherical depression was observed every three times using a fluorescence flaw detection method, and the number of cycles until cracking J1 occurred was measured. These test results were summarized in Table 2. Note that "30 or more" in the column of number of cycles until cracking in Table 2 indicates that no cracking was observed in the spherical recess even after 30 cycles of repeated thermal shock testing.

From the results shown in Table 2, the cast alloys 1 to 62 of the present invention all have extremely superior room temperature and high HP, as well as room temperature toughness and wear resistance, compared to conventional casting alloys 1 and 2. , and thermal shock resistance.

In this way, the cast alloys 1 to 62 of the present invention all have excellent room temperature and high temperature hardness, toughness, abrasion resistance, and thermal shock resistance. Comparative cast JM i'i golds 1 to 15 whose content (those marked with * in Table 1) are outside the scope of the present invention have at least one or more of these characteristics. As mentioned above, the cast alloy of the present invention has particularly excellent heat resistance, wear resistance, and thermal shock resistance (1'), so that these properties are When used as a guide shoe for a hot tilt rolling mill (including a perforating machine) for the production of seamless steel pipes as required,
It has excellent industrial properties, such as exhibiting stable performance over an extremely long period of time.

Applicant: Mitsubishi Metals Corporation Agent Tomi 1) Kazuo

Claims (1)

[Claims] (1) C: 0.55-2%, Cr: 10-2
Less than 8% Fe: 1-30%, W: 0.1-10%, h
IO: 01~1'Ofb, Co: l~8%,
Ti: 0.01-4.5%, At: 0.01-4
．． An N1 base casting alloy for use in a hot tilt rolling mill for producing seamless steel pipes is characterized in that it contains 5% N1 and the rest consists of N1 and unavoidable impurities (weight %). (21C2 0.5!5~2%, Cr:
10 to 2'8% non-714°Fe:
1-30%, W: 0.1
~10%, No. 20, l
~lO%, Co: 1-8%, Ti: 0.01
~4.5%, A9°:O,01-4,5%, and Si
: 0.1 to 3%, with the remainder being N1 and unavoidable impurities (weight %) N1 for guide shoe of a hot tilt rolling mill for manufacturing seamless steel pipes
Base casting alloy. (,:3J C: 0.55-2% lCr: 10-2
Less than 8%. T',: 1 to 30%, W:
0.1 to 10%, Mo: 0.1 to l ()
Li%, Co:l ~ 8%, Ti
: 0.01 to 4.5%, At:
,], Ol ~4.5%, and Mn: 0.1~
A Nl-based casting alloy for use in a 111 hot tilt rolling machine for producing seamless steel pipes, characterized by having a composition (hereinafter referred to as ERW%) containing 3% N and the remainder being N and 6 % avoidable impurities. 3゜(4) C: 0.55~2%, Cr: 10~2
Less than 8%. T'-j: 1 to 30%, W:
0.1 ~10 Taro, Mo: 0.1 ~10
%, Co: 1-8%, Ti: 0.01-4.5%,
Contains At: 0.01 to 4.5%, and further N:
I for a guide shoe of a hot tilt rolling mill for seamless steel pipe production, characterized by having a composition (weight ratio) containing 0.005~; !, base casting alloy. (5) C: 0.55-2%, Cr: 10-28%
less than. lI', -: l~30%, W: 0.1~10
%, Mo: 0.1-10%, Co:
1-8%, Ti: 0.01-4
．． 5%, AQ: 001-45%, and Si:
J ear 0.1~3% and further N:0.005~02
%, with the remainder consisting of N1 and unavoidable impurities (
The N1-based casting alloy for the hot ILrj oblique rolling mill for producing seamless steel pipes is characterized in that it yields more than 1% by weight). C61C: 0.55-2%, 'Cr: 10-28%
Not yet (West. Fe: 1~30%, W:○]~lO%, Mo2O, 1~
:l-0%, Co: 1-8%, Ti: 00
1~45%, AQO, 01~4.5'%, and Mn: 0.1~3%, and further N: 0.005~
A N base casting alloy for a guide shoe of a hot tilt rolling mill for producing seamless steel pipes, characterized in that it contains 0.2% Ni and the remainder consists of Ni and unavoidable impurities (weight %). (71C: 0.55 to 2%, Cr210 to less than 28%. Fe: 1 to 30%, W: 0.1 to 10%, Mt+:
O, 1-10%, Co: 1-8%, Ti:
0.01-4.5%, AQ: 0.01-45%, further Nb: o, o1-1.5% and Ta:
0. - A guide for a hot tilt rolling mill for producing seamless steel pipes characterized by having a composition (by weight %) containing one or two of 01 to 1.5% and the remainder consisting of unavoidable impurities. 11, base casting alloy for shoes. (81C: 0.55 to 2%, Cr: 10 to less than 28%.
-W: 0.1 to 10%,
IV4o: 0. 1-10%, CO:
1-8%, Tl: 0.01-4.5%,
Al: O, Oi ~4.5%, and! 31',
Contains 0.1 □ 3%, and further contains lJ', 0.
01-1. ．． 5% and one or two of Ta: 0.01 to 1.5%, with the remainder consisting of unavoidable impurities (weight %). 1 inch 1 for guide shoe of inclined rolling mill
Base casting alloy. ('JI C: 0.55~2%, Cr: 10~
Less than 28%. t'(+,'i~30%, W: 0.1~'1
0%, Mo, '0.1~J-0%, C+):
1-8%, Tl: 0.01-4.5%, Ae: 0
．． 01-4.5%, and Mn', 0.1-'3
% and further tJl: 0.01~],,
5% O, 1 and 'I'a: 0.01 to 1.5%. Ub
O"'1"'ffi! ? , = 1□2□11, a. An N1-based casting alloy for a guide shoe of a hot tilt rolling mill for producing seamless steel pipes, characterized in that the composition (weight %) is composed of IJ1 avoidable impurities. (10) C: 0.55~2%, Cr: 10~
Less than 28%. Fe: 1-30%, W: 0.1-10%, Isolation: 0.
1-10%, Co: 1-8%, T+: 0.01
~4.5%, Ae: 0.01~4.5%, further B: O, 001~02% and Zr: 0.001~0
A guide shoe for a hot tilt rolling mill for producing seamless steel tubes, characterized in that it contains one or two glazes of 2% and the rest consists of N1 and unavoidable impurities (weight percent). N1 base casting alloy. (11) C: 0.55-2%, Cr: 1
0 to less than 28%. Fe: 1-30%, W: 0.1-10%,
Mo: 0.1-10%, Co2 1-B
'% j Ti: 0.0 1 ~ 4. ．． 5
%, Ai! :0.01-4.5%, and Sl:0.1
Contains ~3%, and further contains B20.001~0.2
% and Zr 20.001 to 0.02%, and the remainder is N1 and unavoidable impurities (hereinafter referred to as superposition). N1 base casting alloy for guide shoes of inclined rolling mills. (12) C: 0.55~2%, Cr: 10~
28% not 7^. I love [, 1-30%, W
: 0.1 ~ l O%, k (
1: 0. 1-10%, CO: l
~8%, Tj: 0.0 1~45%, A1.
001 to 45%, and M++: 0.1 to 3%, and further contains B: 0001 to 02% and Zr: O,0
A guide shoe for a hot tilt rolling mill for producing seamless steel pipes, characterized in that it contains one or two of the following: 01 to 02%, with the remainder consisting of N1 and unavoidable impurities (weight percent). Ni-based casting alloy. (13) C: 0.55~2%, Cr: 10~
Less than 28%. 11tH: 1-30%, W: 0.1-10
%, I・AQ: 0.1~10%, Co: 1
~8%, Ti: 001~4.5%, Ae: 0
．． 01 to 4.5%, and further contains Jj: 0. O05
~L, 1.2 Llb, only b: 0.01-1.5% and Ta: 0.01-1. A hot tilt rolling mill for producing seamless steel pipes, characterized in that it contains one or two of the elements listed in section b, with the remainder consisting of N and unavoidable impurities (weight percent). 11] Base casting alloy for ID shoes. (14 houses: 0.55~2.%, Cr: l O~
Less than 28%. +-', -:: 1-30%, W: 0.1-1
0%, Mo: 0.1~+0%, C: t-, +:
i ~8%, 'I'l: 0.0 ] ~4.5%,
AN2001-45%, Si: 0.1-3%, and N: 0. OO, 5~02% and Nb:
0. O]~], 5% and Ta: 0.01~1.
Contains 2 kinds of LF Ichishita out of 50, and the rest is Ni.
A Ni-based casting alloy for guide shoes of hot tilt rolling mills for manufacturing seamless steel pipes, which is characterized by having a composition (weight ratio) consisting of unavoidable impurities. (15) C: 0.55”-2%, Cr: l
O ~ less than 28%. Fe: 1 to 30%, W: O,j to 10%,
MOlo”~10%, Co: 1~8%, Ti
: 0.01~4. ．． Contains 5%, Ae: 0.01 to 4,5, and M old O1 to 3, and further N: 0005
~0.2%, Nb:0.01~15% and Ta
: 0.01 to 1.5% of lm or two, and the rest is Ni and unavoidable impurities11) A heat for producing seamless steel pipes characterized by having a composition (the above weight %) Ni-based casting alloy for guide/knee of inclined rolling mill. (16) C: 0.55-2%, Cr: 10
-Less than 28%. Fe: 1 to 30%, W: 0.1 to
10%, 1, i(): l',),
1 to 10%, Co: 1 to 8%
l T1 2 O,0,1~4.2) %,
to LI:00] to 4.5, and further N:0
．． 005~S2CH and B: 0.001~0.2%
and Zr: one or two of 0.001 to O2%
Casting for a guide shoe of a hot tilt rolling mill for seamless steel pipe production, characterized by a composition (by weight %) containing 111 and 111 carbonaceous impurities, and 111 and non-avoidable impurities. alloy. (17) (: ', 055~2%, Cr: l
O~28% Vermilion? A. ! , 4.1-30%, W: 0.1-10%
, 1-1o: 0.1-10%, CLJ: 1-8
%, Ti: 0.01-4.5, AP! . 0, C) 1 to 4.5%, and Sl', O] to 3%, further containing IJ: 0.005 to 02%, and b: 0.0
01~J, 7% and Zr: 0.001~0.2%
Idshukawa JJ is a hot tilt rolling mill for seamless steel pipe manufacturing which is characterized by having a composition (weight ratio) containing one or two of the above, and the remainder consisting of Ni and unavoidable impurities. I-base casting alloy. (is) c: o, 55~. z%, Cr:10
~less than 28%. 1,,,', 1-30%, W: 0.1-10%, l-A
Q-01-10'%, Co: 1-8%, Tl: 0.
01 to 4.5%, At: 0.01 to 4.5%, and Mr+: O, 1 to 3%, and further N: 0.01 to 4.5%.
Section 005-0.2, B: O, 001-02% and Z
r: One or two of O, OOl ~ 0.2%
A Ni-based casting alloy for a guide shoe of a hot tilt rolling mill for producing seamless steel pipes, characterized by having a composition (weight ratio) containing Ni and J-type impurities. ) C: 0.55-2%, Cr: 10-2
Less than 8%. Fe: 1-30%, W: 0.1-10%, M(1:
0.1-10%, Co: 1-8%, Ti: 0.
01-4.5%, AQ2001-4.5qb, further Nb:t), 01-1.5% and Ta:0
．． One or two types of Sections 01 to 1.5 and B:O,
OO1~0.2% and Zr: O,ut) 1~0
．． A hot tilt rolling mill for producing seamless steel pipes is characterized in that it contains one or two of 2% Ni and the rest consists of Ni and unavoidable impurities. N1 base casting alloy. (20) C: 0.55-2%t Cr: 10-
Less than 28%. Fe: IA-30%, W: 0.1-10%lk4+
, + II"('], 1~10 To, 'Co:
1~B%, Ti: 0.01~4.5%, AQ: 0
．． 01 to 45%, and Si:O, 1 to 3%,
Further Nl): 0.01-1.5% and 'I'a
: One or two of 0.01 to 15% and B:
0. Contains 1-0.2% OO and one or two of Zr:O, OO1-02, and the rest is N1 and non-J.
A N, base casting alloy for a guide shoe of a hot tilt rolling mill for producing seamless steel pipes, characterized by having a composition (the above weight %) consisting of avoidable impurities. (21) C: 0.55~2%, L:r: 10~
Less than 28%. ! 1'v: l~30%, W:0.1~10%, M
o: 0.1-10qb, co: 1-s%, Ti
:, 0.01-4.5%, AQ: 0.01-4.5%
, and 1Arr:01-3 qb, and further contains 1
Summer: 0.01-1.5% and Ta: 0.01-1
One or two of 5% and B:O, OO1-02
and Zr: One or two of 0.001 to 0.02 Ti, with the remainder consisting of Nj and unavoidable impurities (weight %). TL-based casting alloy for guide shoes of inclined rolling mills. (22) C2055~2%, Cr: 10~28%
less than. J Kui: 1-30%, W: 0.1-10%, Mo: 0.1
~10%, Co: -1~8%
, Ti 20,01 to 4.5%,
Contains Ay: 0.01 to 4.5 qb, and further contains N
:0005~062%, one or two of Nb:o, ol~x, 5% and Ta:O,O1~1.5%, B:υQ O'1~0.2%, and Zr:O,O
Contains one or two of Ol ~ 0.2%,
Composition with the remainder consisting of N1 and unavoidable impurities (more than % by weight)
The N1 base casting alloy for Idonyu is a hot tilt rolling mill for producing seamless steel pipes, which is characterized by having the following. (23) C: 0.55~2%, Cr: 10~
Less than 28%. F'e: 1-30%, W: 0.1-10%,
M (1: O, i ~ l O%, Co2 l
~8%, Ti: 0. 0 1 ~
4. 5 Contains To, All: 0.01 to 4.5 qb, and Si2 0.1 to 3 qb, and further N: 0
．． 005-0.2%, Nb2 0.01-1.5% and Ta2'0. 1f heavy or 2 types of '01~1.5chi, B:, O, OOl ~0.2% and Zr
: A heat source for producing seamless steel J pipes characterized by having a composition (weight %) containing one or two of 0o(11 to 0.2g) and the remainder consisting of N1 and unavoidable impurities. N1 base casting alloy for guide shoes of inclined rolling mill. CJ) (Si: 0.55-2%, Cr: 10-28
Less than 4. +1. ,: i ~ 30%, W:
0.1-10%, Mo: 0.1-1
0%, Co: 1-8%,
Ti 20, 01 to 4.5%,
At: :), o l ~4. ．． 51%, and! ,
Contains 0.1 to 3% of J:0.
005 to 0.2, one or two of Nb: 0.01 to 15% and ']a2 0.01 to 1.5%, and )i: 0.001 to 0.2. % and Zr:O,0
Composition containing one or two of 01 to 02%, and the remainder consisting of 1.11 and 1.0% (by weight)
A Ni-based casting alloy for a guide shoe of a hot tilt rolling mill for producing seamless steel pipes, characterized by having the following characteristics: