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A kind of production method of stainless steel tube for heat exchanger

A stainless steel tube and production method technology, applied in the field of stainless steel production process improvement, can solve the problems of unsuitability for heat exchangers, waste of production costs, lack of quality assurance, etc., and achieve high surface quality, improved stability, and good surface quality. Effect

Active Publication Date: 2017-04-05
HUZHOU HUATE STAINLESS STEEL TUBES MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether the product is qualified or unqualified until the final product is inspected results, resulting in waste of production costs, and the quality is not guaranteed
In some cases, it cannot be remanufactured, especially when unqualified products are found in the inspection of fixed-length tubes, and the production can only be refilled.
[0003] Chinese patent CN1563772A (2005-1-12) discloses a fully wrapped stainless steel pipe and its manufacturing method, but it is not suitable for preparing heat exchangers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The production method of the stainless steel tube used in the heat exchanger includes the following steps: round steel raw material—peeling—perforation—barren pipe—polishing—inspection—cold rolling—cold drawing—degreasing—annealing—pickling—finished product;

[0033] For finished TP304L (06Cr19Ni10) stainless steel pipes with specifications of 19.01*1.61mm:

[0034] The perforation temperature is 1150°C; the blank tube is 66*4.2;

[0035] The lubricating oil that adopts during cold drawing is the paraffin of 35wt% and the machine oil mixture of 65wt%;

[0036] The first cold rolling to 37*2.31mm, the cold deformation coefficient is 3.31;

[0037] The second cold rolling to 19.01*1.61mm, the cold deformation coefficient is 2.88.

[0038] Annealing is carried out in stages, the temperature is 720°C, 930°C, 1010°C, 1045°C, 1045°C in sequence, and the temperature is kept for 6 minutes;

[0039] Pickling adopts mixed acid pickling, the mixed acid includes hydrofluoric aci...

Embodiment 2

[0042] The production method of the stainless steel tube used in the heat exchanger includes the following steps: round steel raw material—peeling—perforation—barren pipe—polishing—inspection—cold rolling—cold drawing—degreasing—annealing—pickling—finished product;

[0043] For finished TP304L (06Cr19Ni10) stainless steel pipes with specifications of 19.08*1.69mm:

[0044] The perforation temperature is 1190°C; the blank tube is 68*4.8;

[0045] The lubricating oil that adopts during cold drawing is the paraffin of 45wt% and the machine oil mixture of 55wt%;

[0046] The first cold rolling to 39*2.38mm, the cold deformation coefficient is 3.38;

[0047] The second cold rolling to 19.08*1.69mm, the cold deformation coefficient is 2.95.

[0048] Annealing is carried out in stages, the temperature is 750°C, 970°C, 1050°C, 1065°C, 1065°C in sequence, and the temperature is kept for 10 minutes;

[0049] Pickling adopts mixed acid pickling, the mixed acid includes hydrofluoric ac...

Embodiment 3

[0052] For finished TP304L (06Cr19Ni10) stainless steel pipes with specifications of 19.05*1.65mm:

[0053] The perforation temperature is 1160°C; the blank tube is 67*4.5mm;

[0054] The lubricating oil that adopts during cold drawing is the paraffin of 40wt% and the machine oil mixture of 60wt%;

[0055] The first cold rolling to 38*2.35mm, the cold deformation coefficient is 3.35;

[0056] The second cold rolling to 19.05*1.65mm, the cold deformation coefficient is 2.92.

[0057] The annealing is carried out in stages, the temperature is 780°C, 950°C, 1020°C, 1050°C, 1050°C in sequence; the temperature is kept for 8 minutes.

[0058]Pickling adopts mixed acid pickling, mixed acid includes 5-8wt% hydrofluoric acid and 10-15wt% nitric acid, and the pickling temperature is 40-60°C.

[0059] The final stainless steel tube is suitable for use in heat exchangers; the finished product rate is increased to 88.8%, and the cost is reduced.

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Abstract

The invention relates to stainless steel production process improvement, in particular to a stainless steel tube production method for a heat exchanger. The stainless steel tube production method sequentially includes the steps: round steel raw material preparation; peeling; perforation; billet tube preparation; polishing; checking; cold rolling; cold drawing; deoiling; annealing; acid pickling; finished product forming. The perforation temperature is 1100-1190 DEG C, and lubricating oil used for cold drawing is mixture including 35-45wt% of paraffin and 55-65wt% of oil. Annealing is realized by stages, temperatures are sequentially 700-800 DEG C at a first stage, 930-970 DEG C at a second stage, 1010-1050 DEG C at a third stage, 1030-1080 DEG C at a fourth stage and 1030-1080 DEG C at a fifth stage, and the fourth stage and the fifth stage are temperature keeping stages totally for 6-10 minutes. Mixed acid is used in acid pickling and comprises, by ratio, 5-8wt% of hydrofluoric acid and 10-15wt% of nitric acid, and the acid pickling temperature is 40-60 DEG C. A stainless steel tube produced by the method is applicable to the heat exchanger and high in yield.

Description

technical field [0001] The invention relates to an improvement of a stainless steel production process, in particular to a production method of a stainless steel tube used in a heat exchanger. Background technique [0002] Existing product implementation standards are becoming more and more stringent. Whether the product is qualified or unqualified until the final product is inspected results, resulting in waste of production costs, and the quality is not guaranteed. In some cases, it cannot be remanufactured, especially when unqualified products are found in the fixed-length tubes, and the production can only be refilled. [0003] Chinese patent CN1563772A (2005-1-12) discloses a fully wrapped stainless steel pipe and its manufacturing method, but it is not suitable for preparing heat exchangers. Contents of the invention [0004] The purpose of the present invention is to provide a production method for stainless steel tubes for heat exchangers that is suitable for hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/26
CPCB23P15/26
Inventor 沈勇柳志良吴卫星钟国鹏
Owner HUZHOU HUATE STAINLESS STEEL TUBES MFG