Technical standards for high-pressure fertilizer pipes
High pressure fertilizer pipe GB6479-2000
High pressure fertilizer pipe specifications: 8-1240×1-200mm
High-pressure fertilizer pipe manufacturing process: hot rolling, cold drawing, thermal expansion
High-pressure fertilizer pipe standard: GB6479 – Chinese national standard
High-pressure fertilizer pipe uses: Seamless steel pipes used for high-pressure fertilizer equipment and pipelines.
Partial material list of high-pressure fertilizer pipe
121×6-7-8-10-12-14-16-20
273×30-35-38-40
127×-6-7-8-10-12-14-16-20
299×8-12-16-20-24-28
133×6-8-12-14-16-18-20-25-30
299×30-32-36-38-40
140×6-7-8-9-10-12-14-16-20-22
325×8-12-14-18-38
146×6-8-12-14-16-18-20-25-30
325×28-32-34-38
152×6-8-12-14-16-18-20-25-30
351×10-16-20-25-40
159×6-10-12-14
355×6-18-20-25-30-40
159×16-18-20-22-25-30
377×8-12-15-20-24-28
168×8-10-12-14-20-25-30-35
377×30-37-40
180×8-12-16-25-30
402×10-15-20-25-30-35
180×32-34-38-40
406×10-20-25-28-35-40
194×6-8-12-16-20-25-30-40
426×10-12-14-16-20-25-30-35-40
High-pressure fertilizer pipe weight formula: [(outer diameter-wall thickness)*wall thickness]*0.02466=kg/meter (weight per meter)
The main steel pipe grades produced for high-pressure fertilizer pipes are:
Serial number Grade Heat treatment system
1 10 normalizing
2 20 normalizing
3 16Mn normalizing
4 12CrMo 900~930℃ normalizing, 670~720℃ tempering, holding time: periodic furnace is more than 2h, continuous furnace is more than 1h
5 15CrMo 930~960℃ normalizing, 680~720℃ tempering, holding time: periodic furnace more than 2h, continuous furnace more than 1h
6 12Cr2Mo Normalizing at 900~960℃, tempering at 700~750℃, holding time: more than 1h
7 1Cr5Mo Annealing
High-pressure fertilizer pipe process flow: tube blank – inspection – metal forging – peeling – inspection – heating – perforation – pickling – grinding – lubrication and air drying – welding head – cold drawing – solidification Solution treatment – pickling – pickling and passivation – inspection – cold rolling – degreasing – cutting – air drying – internal polishing – external polishing – inspection – marking – finished product packaging
Industrial pipe and seamless pipe process flow: tube blank – inspection – peeling – inspection – heating – perforation – pickling – mushroom repair – lubrication and air drying – welding head – cold drawing – solid solution Treatment – pickling – pickling passivation – inspection
High-pressure fertilizer pipe delivery status: Steel pipes should be delivered after heat treatment as specified in the following table. The heat treatment system should be filled in the material certificate.
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