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A kind of stainless steel tube production method for condenser

A technology of stainless steel pipe and production method, which is applied in the field of stainless steel production process improvement, can solve the problems of not being suitable for preparing condensers, swelling and immobility, etc., and achieve the effects of eliminating fine cracks on the surface, improving stability, and high surface quality

Active Publication Date: 2017-01-04
HUZHOU HUATE STAINLESS STEEL TUBES MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary stainless steel seamless steel pipe cannot meet its production and processing requirements, and ordinary steel pipe does not expand, so a special customized stainless steel pipe for condenser is required
[0003] For example CN1563772A (2005-1-12) discloses a kind of all-wrapped stainless steel pipe and its manufacturing method, relates to tube expansion, but is not suitable for preparing condenser

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The production method of the stainless steel tube used in the condenser includes the steps of: round steel raw material—peeling—perforation—barren pipe—polishing—inspection—cold rolling—cold drawing—degreasing—annealing—pickling—finished product;

[0048] The chemical composition mass content in the round steel raw material is:

[0049] C 0.025%

[0050] Mn 1.4%

[0051] Si 0.3%

[0052] P 0.033%

[0053] S 0.001%

[0054] Cr 18.05%

[0055] Ni 8.13%;

[0056] Annealing is carried out in stages, the temperature is 750°C, 950°C, 1040°C, 1060°C, 1060°C in sequence, the annealing speed is 0.6 m / min, and the fourth and fifth stages are heat preservation stages for a total of 13 minutes;

[0057] Pickling is specifically to use 36wt% industrial hydrofluoric acid and 96% industrial nitric acid for pickling according to the mass ratio of 5wt% and 10wt% mixed acid. The pickling temperature is 40°C; the pickling time is 4.5 hours .

[0058] For the finished product of 06...

Embodiment 2

[0064] The production method of the stainless steel tube used in the condenser includes the steps of: round steel raw material—peeling—perforation—barren pipe—polishing—inspection—cold rolling—cold drawing—degreasing—annealing—pickling—finished product;

[0065] The chemical composition mass content in the round steel raw material is:

[0066] C 0.035%

[0067] Mn 1.7%

[0068] Si 0.45%

[0069] P 0.035%

[0070] S 0.003%

[0071] Cr 18.30%

[0072] Ni 8.03%;

[0073] Annealing is carried out in stages, the temperature is 780°C, 970°C, 1050°C, 1065°C, 1065°C in sequence, the annealing speed is 0.8 m / min, and the fourth and fifth stages are heat preservation stages for a total of 16 minutes;

[0074] Pickling is specifically to use 38wt% industrial hydrofluoric acid and 98% industrial nitric acid for pickling according to the mass ratio of 8wt% and 15wt% mixed acid. The pickling temperature is 60°C; the pickling time is 5.5 hours .

[0075] For the finished product of 06C...

Embodiment 3

[0081] The production method of the stainless steel tube used in the condenser includes the steps of: round steel raw material—peeling—perforation—barren pipe—polishing—inspection—cold rolling—cold drawing—degreasing—annealing—pickling—finished product;

[0082] The chemical composition mass content in the round steel raw material is:

[0083] C 0.030%

[0084] Mn 1.6%

[0085] Si 0.35%

[0086] P 0.034%

[0087] S 0.002%

[0088] Cr 18.1%

[0089] Ni 8.08%.

[0090] Annealing is carried out in stages, the temperature is 760°C, 960°C, 1040°C, 1070°C, 1070°C in sequence, and the annealing speed is 0.7 m / min. The fourth and fifth stages are heat preservation stages for a total of 15 minutes.

[0091] Pickling is specifically to use 39wt% industrial hydrofluoric acid and 97% industrial nitric acid for pickling according to the mass ratio of 7wt% and 12wt% mixed acid, the pickling temperature is 50 ° C; the pickling time is 5 hours .

[0092] For the finished product of 06...

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Abstract

The invention relates to stainless steel production technology improvement and especially relates to a condenser stainless steel pipe production method. The condenser stainless steel pipe production method comprises round steel raw material preparation, peeling, perforation, pierced billet preparation, polishing, examination, cold rolling, cold drawing, oil removal, annealing and pickling. The round steel raw material comprises, by mass, 0.025-0.035% of C, 1.4-1.7% of Mn, 0.30-0.45% of Si, 0.033-0.035% of P, 0.001-0.003% of S, 18.05-18.30% of Cr and 8.03-8.13% of Ni. The annealing process is carried out by stages, in the annealing process, a temperature in a first stage is in a range of 750-780 DEG C, a temperature in a second stage is in a range of 950-970 DEG C, a temperature in a third stage is in a range of 1010-1050 DEG C, a temperature in a forth stage is in a range of 1060-1080 DEG C and a temperature in a fifth stage is in a range of 1060-1080 DEG C, an annealing rate is in a range of 0.6-0.8m / min, and the time of thermal insulation phases of the forth stage and the fifth stage is in a range of 13-16min. In pickling, pickling time is in a range of 4.5-5.5h. The produced stainless steel pipe can be used in a low temperature equipment condenser and can carry out safe pipe expanding before installation.

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 condenser. Background technique [0002] The production process of the product is consistent with that of ordinary stainless steel seamless steel pipe, and the material is 304. Ordinary stainless steel seamless steel pipes cannot meet its production and processing requirements, and ordinary steel pipes cannot expand, so a special customized stainless steel pipe for the condenser is required. [0003] For example, CN1563772A (2005-1-12) discloses a fully-wrapped stainless steel pipe and its manufacturing method, which involves tube expansion, but is not suitable for preparing condensers. Contents of the invention [0004] The object of the present invention is to provide a production method for stainless steel tubes suitable for cryogenic equipment, capable of safe tube expansion and good surface qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06C22C38/58C22C38/40C21D8/10
CPCB21C37/06C21D8/105C22C38/40C22C38/58
Inventor 冯永森阙金英徐培玉
Owner HUZHOU HUATE STAINLESS STEEL TUBES MFG