JP2005152910A - Method for joining titanium clad steel and stainless steel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for joining a titanium clad steel and a stainless steel. <P>SOLUTION: In the method, when joining a stainless steel 1 and a titanium three-layered clad steel 2, which is made by stacking a base material 3b, a stainless material layer 4b, a titanium material layer 5 in this order, and which has the stainless material layer exposed on the outer surface of its outer peripheral edge part, the base material of the titanium three-layered clad steel 2 and the stainless steel are joined by conducting build-up weld. On a build-up welded part 6, which is formed between the base material and the stainless steel, build-up weld is further conducted using a stainless material 7. Thus, a welded part is formed being joined to both of the stainless material layer of the titanium three-layered clad steel and the stainless steel and covers the build-up welded part formed between the base material of the titanium clad steel and the stainless steel. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

      The present invention relates to a method for joining titanium clad steel and stainless steel. More specifically, a base material, a stainless material layer, and a titanium material layer are laminated in this order, and the outer surface of the outer peripheral edge relates to a method for joining the titanium three-layer clad steel with the stainless material layer exposed to the stainless steel.

  Various materials such as a reaction tank, a reaction tower, and a storage tank in a chemical plant, particularly an inner wall material, are selected depending on the type and composition of contents to be used, use conditions such as reaction temperature, and the like. When reaction conditions are severe or when corrosion is likely to occur, a titanium material made of titanium or an alloy thereof may be used.

  However, if the entire reaction vessel or the like is made of a titanium material, the cost becomes high. For this reason, there are cases in which the entire reaction vessel is manufactured with carbon steel or stainless steel, the inside of which is laminated with titanium steel on the surface of carbon steel or stainless steel, and lined with rolled titanium clad steel. is there.

  By the way, depending on the type and composition of contents to be used, use conditions such as operation temperature, etc., the inner surface of a reaction vessel, a distillation column, etc. may be mixed with not only titanium material but also stainless material.

However, since titanium material is difficult to weld with carbon steel or stainless steel, as described above, when titanium material and stainless steel material may be mixed on the inner surface of a reaction vessel or the like, there is a problem in joining. Had.
Then, this invention aims at providing the method for joining titanium clad steel and stainless steel.

  This invention solved the said subject by using the joining method of predetermined titanium clad steel and stainless steel. That is, in the invention about the method for joining titanium clad steel and stainless steel, the base material, the stainless material layer, and the titanium material layer are laminated in this order, and the outer surface of the outer peripheral edge portion is titanium exposed from the stainless steel layer. When joining the three-layer clad steel and stainless steel, the base material of the above-mentioned titanium three-layer clad steel and stainless steel are welded and welded, and the stainless steel material is used on the weld overlay. By weld welding, this weld is joined to the stainless steel layer and stainless steel of the titanium three-layer clad steel, and the base material of the titanium three-layer clad steel and the overlay weld of the stainless steel are covered by a method. is there.

The build-up weld of the base metal is welded with stainless steel or covered with a plate made of stainless steel, so that it is possible to prevent the base material of the clad steel from being exposed at the joint. Etc. can be prevented.
Moreover, this invention can be used for the apparatus used of a terephthalic-acid manufacturing process, for example.

Hereinafter, the present invention will be described in detail.
The joining method concerning this invention is a method of joining titanium clad steel and stainless steel.

With titanium clad steel, as shown in FIG. 1 (a) and FIG. 2 (a), a base material 3b, a stainless material layer 4b, and a titanium material layer 5 are laminated in this order, and on the outer surface of the outer peripheral portion. The titanium three-layer clad steel 2 with the stainless steel material layer 4b exposed.
In the present invention, the titanium clad steel may have another metal layer formed between the base material and the titanium material layer as necessary.

  This titanium clad steel is composed of carbon steel, stainless steel layer, titanium material layer, and other metal layers between the base material and titanium material layer, if necessary. Manufactured by. Accordingly, the titanium clad steel basically has three layers, but may have four or more layers.

Here, the joining method of stainless steel and titanium clad steel will be described with reference to FIGS.
The stainless steel 1 is a solid steel made of a stainless material as shown in FIG.

  Examples of the stainless steel include various types of SUS. Specific examples include ASTM standards A240-304L (JIS standard: SUS304L), A240-316L (JIS standard: SUS316L), A240-317L (JIS standard: SUS317L). Etc.

  Examples of the base material 3b constituting the titanium clad steel 2 include carbon steel. Specific examples of the carbon steel include ASTM standards A516-60 (JIS standard: SGV42), A516-65 (JIS standard: SGV46), A516-70 (JIS standard: SGV49), and the like. Moreover, as a material which comprises the stainless material layer 4b, the material similar to the stainless material layer a used for said stainless steel 1 can be used.

  Examples of the titanium material 5 constituting the titanium material layer include a material made of pure titanium having an impurity such as iron of 0.35% by weight or less, a material made of an alloy of titanium and another metal, and the like. Specific examples of the pure titanium material include ASTM standards B265-1 (JIS standard: TP-2), B265-2 (JIS standard: TP-3), B265-3 (JIS standard: TP-3), and the like. can give.

Next, a method for joining the stainless steel 1 and the titanium clad steel 2 will be described.
First, the stainless steel 1 and the base material 3b of the titanium clad steel 2 are welded and joined.
Next, build-up welding is performed on the build-up welded portion 6, that is, on the build-up portion 6 on the side where the stainless steel layer 4 b of titanium clad steel is provided, using the stainless steel, and the above stainless steel and titanium clad. It joins to both the stainless steel material layers 4b of steel, and covers the build-up welding part 6a. Thereby, exposure of the base material 3b and the build-up portion 6 of the base material is prevented, and when used as a reactor or the like, it is possible to prevent direct contact with the contents and causing corrosion or the like.

  As the material of the stainless steel constituting the build-up weld 7, the same material as that of the stainless steel 1 or the stainless steel layer 4 b of the titanium clad steel 2 may be used, but the corrosion resistance is excellent. It is more preferable to use a stainless steel material.

Moreover, as shown in FIG.1 (c), it covers from the outer surface of the stainless steel 1 to the outer surface of the exposed stainless steel layer 4b at the outer peripheral edge of the titanium clad steel 2 so as to cover the build-up weld 7. A plate-like body 8 made of stainless steel may be placed and joined. As this joining method, as shown in FIG.1 (c), the method of joining by welding the side surface of the plate-shaped object 8 and providing the welding part 9 etc. are mention | raise | lifted.
By providing the plate-like body 8 made of stainless steel, the build-up welded portion 7 made of stainless steel can be protected.

  Furthermore, as shown in FIG. 1 (d), the boundary between the titanium material layer 5 and the stainless material layer 4b of the titanium clad steel 2 may be silver braze seal welded. This part is a weld of a titanium material and a stainless material, and cannot be welded with a general material, but can be welded with silver soldering. And by providing this silver soldering welded part 10, it can suppress that the titanium material layer 5 peels according to use conditions.

  Moreover, the joined bodies having the cross sections shown in FIGS. 1B to 1D may be joined together. In this case, when the titanium layers 5 in both cross sections are joined together by the same method as described above, an opening is generated. That is, for example, as shown in FIGS. 2 and 3, when joining two joined bodies of the stainless steel 1 and the titanium clad steel 2 joined in FIG. 1B, first, the stainless steels 1 and 1 are joined. The base materials 3b and 3b and the build-up welds 6 and 6 are build-up welded in the same manner as described above to form the build-up weld 15. Subsequently, the stainless steel layers 4b and 4b and the build-up welds 7 and 7 thereon are welded with a stainless steel in the same manner as described above to form the build-up weld 16. Next, the titanium materials 5 and 5 are joined in the same manner as described above using the plate-like body 14 made of the titanium material. In this case, as shown in FIG.

  The opening 17 can be closed by covering the opening 17 with a plate made of titanium material. The titanium plate member can be joined to the titanium material layer using the same material as that used in the joint 12 for the counterpart material, and the counterpart material is a stainless steel material. The layer can be sealed with silver braze seal welding, Teflon material or the like.

  In addition, as an example of the stainless steel material and titanium material which comprise the plate-shaped body 8 made from said stainless steel, and the plate-shaped bodies 11 and 14 made from titanium material, it is the same as that of the example of the above-mentioned stainless steel material or titanium material. Can give.

  When the joining method of the present invention is adopted, welding with stainless steel is possible even when titanium clad steel having a titanium material layer is used, and a plurality of materials including titanium material are used on the inner surface of a reaction vessel or the like. Is possible.

Hereinafter, the present invention will be described in more detail with reference to examples.
(Example 1)
The following titanium three-layer clad steel and stainless steel were arranged as shown in FIG.
Titanium three-layer clad steel: carbon material layer (A516-60: thickness 22 mm), stainless steel material layer (A240-304L, Ni: 9.00 to 13.00 wt%, Cr: 18.00 to 20.00 wt%) , C: 0.08 wt% or less, Si: 1.00 wt% or less, Mn: 2.00 wt% or less: thickness 5 mm), and titanium material layer (B265-1: thickness 3 mm) in this order Laminated and rolled.
Stainless steel: A240-304L, Ni: 9.00 to 13.00 wt%, Cr: 18.00 to 20.00 wt%, C: 0.08 wt% or less, Si: 1.00 wt% or less, Mn : A composition having a composition of 2.00% by weight or less. Thickness 27mm.

Subsequently, the carbon material layer portion of the titanium three-layer clad steel and stainless steel were build-up welded using a carbon steel welding rod. Then, using a stainless steel welding rod made of the same material as the stainless steel, overlay welding was performed so that the stainless steel layer portion of the titanium three-layer clad steel and the stainless steel were connected.
Then, a plate-like body made of stainless steel (A240-304L) is arranged on the stainless steel layer portion of the titanium three-layer clad steel and the stainless steel, and welded thereon, as shown in FIG. 1 (c). It joined as follows.

[result]
When the acetic acid aqueous solution was put into the vessel manufactured by joining the titanium clad steel and the stainless steel obtained as described above and left to stand at 60 ° C. for one month, there was no problem of leakage or corrosion. .

(A)-(d) Sectional drawing which shows the example of the joining method of titanium clad steel and stainless steel The perspective view before joining two of FIG.1 (b) The perspective view after joining two of Drawing 1 (b)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stainless steel 2 Titanium clad steel 3b Base material 4b Stainless steel layer 5 Titanium material layer 6, 6c Overlay welding part 7, 7c Overlay welding part 8 Plate-like body 9 Welding part 10 Silver brazing weld part 11 Plate-like body 12 Welding Part 13 Space part 14 Plate-like body 15 Overlay welding part 16 Overlay welding part 17 Opening part

Claims (3)

The base material, the stainless material layer, and the titanium material layer are laminated in this order, and the outer surface of the outer peripheral edge portion is formed by joining the titanium three-layer clad steel with the exposed stainless material layer and stainless steel.
The above-mentioned titanium three-layer clad steel base material and stainless steel are welded and welded together,
By overlay welding using a stainless steel on the build-up weld, this weld is joined to both the stainless steel layer and the stainless steel of the titanium tri-layer clad steel, and the titanium tri-layer clad A joining method of titanium clad steel and stainless steel covering a steel base material and a weld overlay of stainless steel. The plate-shaped body made of stainless steel is joined from the outer surface of the stainless steel to the outer surface of the stainless steel layer of the titanium three-layer clad steel so as to cover the build-up weld portion made of the stainless steel. The joining method of titanium clad steel and stainless steel as described in 1. The joining method of the titanium clad steel and stainless steel of Claim 1 or 2 which carries out silver braze seal welding of the boundary part of the titanium material layer and stainless steel material layer of the said titanium three-layer clad steel.

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