Urea-class stainless steel pipe and production process thereof
A technology of stainless steel pipe and production process, which is applied in the field of production process of stainless steel pipe, can solve problems such as incomplete dissolution of carbides, excessive corrosion rate, intergranular corrosion, etc., and achieve good intergranular corrosion resistance and selective corrosion performance, good Corrosion resistance and the effect of stabilizing the austenite structure
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Embodiment 1
[0033] This embodiment is a urea grade stainless steel pipe, its chemical composition and mass percentage are: Ni: 19.6%, Mo: 3.2%, Cr: 19.1%, C: 0.025%, Si: 1.3%, Mn: 1.7%, S : 0.03%, P: 0.035%, Cu: 0.03%, Co: 0.012%, O: 0.03%, Al: 0.3%, Nb: 0.07%, B: 0.001%, N: 0.03%, and the balance is Fe.
[0034] The production process of the urea-grade stainless steel pipe in this embodiment, its process line is: tube blank→solution treatment→peeling and sawing→heating→perforation→first pickling→waste tube inspection→first cold rolling→first degreasing→ First heat treatment→first straightening and cutting pipe→first cooling→second pickling→intermediate inspection→second cold rolling→second degreasing→second heat treatment→bend pipe and elbow heat treatment→second cooling→bright heat treatment→ The third cooling → the second straightening and cutting of pipes → the third pickling → surface inspection of finished products → ultrasonic flaw detection → eddy current flaw detection → spray mark...
Embodiment 2
[0046] This embodiment is a urea grade stainless steel pipe, its chemical composition and mass percentage are: Ni: 19.8%, Mo: 3.5%, Cr: 19.3%, C: 0.028%, Si: 1.5%, Mn: 1.9%, S : 0.05%, P: 0.037%, Cu: 0.05%, Co: 0.016%, 0: 0.05%, Al: 0.5%, Nb: 0.09%, B: 0.003%, N: 0.05%, and the balance is Fe.
[0047] The production process of the urea-grade stainless steel pipe in this embodiment, its process line is: tube blank→solution treatment→peeling and sawing→heating→perforation→first pickling→waste tube inspection→first cold rolling→first degreasing→ First heat treatment→first straightening and cutting pipe→first cooling→second pickling→intermediate inspection→second cold rolling→second degreasing→second heat treatment→bend pipe and elbow heat treatment→second cooling→bright heat treatment→ The third cooling → the second straightening and cutting of pipes → the third pickling → surface inspection of finished products → ultrasonic flaw detection → eddy current flaw detection → spray ma...
Embodiment 3
[0059] This embodiment is a urea grade stainless steel pipe, its chemical composition and mass percentage are: Ni: 19.7%, Mo: 3.3%, Cr: 19.2%, C: 0.027%, Si: 1.4%, Mn: 1.8%, S : 0.034%, P: 0.036%, Cu: 0.04%, Co: 0.014%, O: 0.04%, Al: 0.4%, Nb: 0.08%, B: 0.002%, N: 0.04%, and the balance is Fe.
[0060] The production process of the urea-grade stainless steel pipe in this embodiment, its process line is: tube blank→solution treatment→peeling and sawing→heating→perforation→first pickling→waste tube inspection→first cold rolling→first degreasing→ First heat treatment→first straightening and cutting pipe→first cooling→second pickling→intermediate inspection→second cold rolling→second degreasing→second heat treatment→bend pipe and elbow heat treatment→second cooling→bright heat treatment→ The third cooling → the second straightening and cutting of pipes → the third pickling → surface inspection of finished products → ultrasonic flaw detection → eddy current flaw detection → spray m...
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