阅读说明：本技术 一种降膜管及其制造工艺 (Falling film tube and manufacturing process thereof ) 是由 刘志飚 国书元 丁刚 孙宏勇 张功让 于 2019-03-20 设计创作，主要内容包括：本发明属于冶金技术领域,具体涉及一种降膜管及其制造工艺,降膜管包括1#电解镍,还包括以1#电解镍为基准的重量百分比含量的复合脱氧剂：Mn:0.05％-0.30％、Ti:0.04％-0.15％、Si:0.03％-0.15％、Mg:0.03％-0.05％、Ce+La:0.03％-0.08％,以及以1#电解镍为基准的重量百分比含量的性能添加剂：Cr:0.20％-0.50％、Fe:0.05％-0.25％、Cu:0.10％-0.30％。本发明通过添加多种元素,提高了降膜管的抗拉强度和屈服轻度,以及耐腐蚀的强度,提高的管件的使用寿命,节省了设备的维修及维护成本。(The invention belongs to the technical field of metallurgy, and particularly relates to a falling film tube and a manufacturing process thereof, wherein the falling film tube comprises No. 1 electrolytic nickel and further comprises a composite deoxidizer which takes the No. 1 electrolytic nickel as a reference and comprises the following components in percentage by weight: 0.05 to 0.30 percent of Mn, 0.04 to 0.15 percent of Ti, 0.03 to 0.15 percent of Si, 0.03 to 0.05 percent of Mg, 0.03 to 0.08 percent of Ce + La and performance additives with the 1# electrolytic nickel as the reference in percentage by weight: 0.20 to 0.50 percent of Cr, 0.05 to 0.25 percent of Fe and 0.10 to 0.30 percent of Cu. By adding various elements, the tensile strength, the yield strength and the corrosion resistance of the film reducing pipe are improved, the service life of the pipe is prolonged, and the maintenance cost of equipment is saved.)

1. A falling film tube comprises No. 1 electrolytic nickel, and is characterized in that:

the composite deoxidizer also comprises a composite deoxidizer which takes the No. 1 electrolytic nickel as a reference in percentage by weight: 0.05-0.30% of Mn, 0.04-0.15% of Ti, 0.03-0.15% of Si, 0.03-0.05% of Mg, 0.03-0.08% of Ce + La and

performance additives in percentage by weight based on 1# electrolytic nickel: 0.20 to 0.50 percent of Cr, 0.05 to 0.25 percent of Fe and 0.10 to 0.30 percent of Cu.

2. The membrane-reducing tube according to claim 1, wherein: the purity of the No. 1 electrolytic nickel is more than or equal to 99.9 percent.

3. The manufacturing process of the falling film tube of claim 1,

the method comprises the following steps:

s1, ingot casting, namely adding 1# electrolytic nickel, a composite deoxidizer and a performance additive into a smelting furnace, and adopting vacuum smelting under the pressure of less than 10 Pa;

s2, forging the bar, keeping the temperature between 1050 and 1100 ℃ for 3 to 4 hours, and then adopting three upsetting and three drawing to thoroughly change the casting structure;

s3, turning a light bar;

s4, tube blank making (perforation): keeping the temperature of the pipe penetrating at 1050-1080 ℃ for 1-2 hours, and then performing pipe penetrating operation;

s5, grinding the surface of the tube blank;

s6, pipe rolling (cogging);

s7, finishing the pipe, polishing the outer surface, and boring a single edge of the inner surface by about 0.2 mm;

s8, annealing (reducing atmosphere), and keeping the temperature at 700-750 ℃ for 1-2 hours;

s9, rolling the pipe, wherein the total processing rate of the rolled pipe for the final finished product is reserved by more than 30 percent;

s10, local surface grinding;

s11, rolling a pipe;

s12, annealing the finished product (reducing atmosphere), and preserving heat for 0.5-2 hours at 500-750 ℃;

s13, straightening;

s14, cutting a head;

and S15, checking.

Technical Field

The invention belongs to the technical field of metallurgy, and particularly relates to a falling film tube and a manufacturing process thereof.

Background

Falling the membrane pipe and being the core equipment of alkali lye preparation, the production of falling the membrane formula has also significantly reduced environmental pollution, and is small, advantages such as alkali lye steady quality, accept by domestic most chemical enterprises, the environment that falling the membrane pipe used is more special, so the material of falling the membrane pipe all parts must want the material selection reasonable, it is fairly serious to fall membrane pipe and high concentration's alkali lye contact corrosion, so fall the membrane pipe and need use the nickel of alkali-resisting corruption and will pass through special treatment, the average life of falling membrane pipe 24 months of foreign import, the general shortest 4 months of domestic membrane pipe life, longest 18 months, the tradition falls the membrane pipe and utilizes carbon (C) as the deoxidier, surplus carbon is separated out at the grain boundary, produce grain boundary corrosion, influence life.

Disclosure of Invention

One technical problem to be solved by one aspect of the present disclosure is to provide a falling film tube and a manufacturing process thereof, wherein tensile strength and yield strength of the falling film tube are improved by adding various elements.

In order to achieve the purpose, the invention adopts the following technical scheme that the falling film tube comprises 1# electrolytic nickel and further comprises a composite deoxidizer based on the 1# electrolytic nickel in percentage by weight: 0.05 to 0.30 percent of Mn, 0.04 to 0.15 percent of Ti, 0.03 to 0.15 percent of Si, 0.03 to 0.05 percent of Mg, 0.03 to 0.08 percent of Ce + La and performance additives with the 1# electrolytic nickel as the reference in percentage by weight: 0.20 to 0.50 percent of Cr, 0.05 to 0.25 percent of Fe and 0.10 to 0.30 percent of Cu.

Preferably, the purity of the No. 1 electrolytic nickel is more than or equal to 99.9%.

The manufacturing process of the film-reducing pipe comprises the following steps:

s1, ingot casting, namely adding 1# electrolytic nickel, a composite deoxidizer and a performance additive into a smelting furnace, and adopting vacuum smelting under the pressure of less than 10 Pa;

s2, forging the bar, keeping the temperature between 1050 and 1100 ℃ for 3 to 4 hours, and then adopting three upsetting and three drawing to thoroughly change the casting structure;

s3, turning a light bar;

s4, tube blank making (perforation): keeping the temperature of the pipe penetrating at 1050-1080 ℃ for 1-2 hours, and then performing pipe penetrating operation;

s5, grinding the surface of the tube blank;

s6, pipe rolling (cogging);

s7, finishing the pipe, polishing the outer surface, and boring a single edge of the inner surface by about 0.2 mm;

s8, annealing (reducing atmosphere), and keeping the temperature at 700-750 ℃ for 1-2 hours;

s9, rolling the pipe, wherein the total processing rate of the rolled pipe for the final finished product is reserved by more than 30 percent;

s10, local surface grinding;

s11, rolling a pipe;

s12, annealing the finished product (reducing atmosphere), and preserving heat for 0.5-2 hours at 500-750 ℃;

s13, straightening;

s14, cutting a head;

and S15, checking.

Compared with the prior art, the invention improves the tensile strength, the yield strength and the corrosion resistance strength of the membrane reducing pipe by adding various elements, prolongs the service life of the pipe fitting and saves the maintenance cost of equipment.

Detailed Description

The invention will be further explained with reference to specific embodiments, without limiting the invention.

A falling film tube, the elements comprising:

1# electrolytic nickel with the purity of 99.9%,

adding a composite deoxidizer based on the total weight of the No. 1 electrolytic nickel: 0.10 percent of Mn, 0.10 percent of Ti, 0.10 percent of Si, 0.04 percent of Mg, 0.06 percent of Ce + La,

performance additives are added: 0.30% of Cr, 0.10% of Fe and 0.20% of Cu.

Using the above elements, tubes were made according to the following procedure:

s1, ingot casting, namely adding No. 1 electrolytic nickel into a smelting furnace, adding a composite deoxidizer and a performance additive, and adopting vacuum smelting at the pressure of 9 Pa;

s2, forging a bar, keeping the temperature of 1060 ℃ for 4 hours, and then adopting three upsetting and three drawing to thoroughly change the casting structure;

s3, turning a light bar;

s4, tube blank making (perforation): keeping the pipe penetrating temperature at 1060 ℃ for 2 hours, and then performing pipe penetrating operation;

s5, grinding the surface of the tube blank;

s6, pipe rolling (cogging);

s7, finishing the pipe, polishing the outer surface, and boring a single edge of the inner surface by about 0.2 mm;

s8, annealing (reducing atmosphere), and keeping the temperature at 720 ℃ for 2 hours;

s9, rolling the pipe, wherein the pipe rolling needs to reserve 32% of total processing rate for the final finished product pipe rolling;

s10, local surface grinding;

s11, rolling a pipe;

s12, annealing the finished product (reducing atmosphere), and keeping the temperature at 600 ℃ for 2 hours;

s13, straightening;

s14, cutting a head;

and S15, checking.

The test result of the falling film tube manufactured by using the falling film tube manufacturing process is as follows:

although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.