ANHUI TIANDA OIL PIPE COMPANY LIMITED As a salesman, there is always customerconsultation, whether 20# and 20G is consistent and can be universal inGB/T8163, GB3087, GB6479 and GB5310 during normal communication with customers.Regarding to the standard requirement and daily accumulated knowledge, thesummary is as follows:
GB/T8163-2008 | GB3087-2008 | GB6479-2013 | GB5310-2008 | |
Standard name | Fluid seamless steel tube | Low medium pressure boiler seamless steel tube | Seamless steel pipe used in high pressure chemical fertilizer equipment | High pressure boiler seamless steel tube |
Standard category | recommendry | mandatory | mandatory | Mandatory |
Scope of application | Apply to general seamless steel tube for conveying fluid, work pressure ≤1.0MPa,apply environment temperature under 120 ℃. | Apply to manufacturing various structure of low and medium pressure boiler and locomotive boiler seamless steel tubes, work pressure ≤5.9 MPa,, service environment temperature 300-400 ℃ | Apply to manufacturing seamless steel tube used in high pressure chemical fertilizer equipment and pipeline, working pressure > 5.9 MPa, service environment temperature at 450 ℃and above. | Apply to manufacturing high pressure and over pressure of the steam boiler and pipes with seamless steel tubes, working pressure > 5.9 MPa, service environment temperature at 450 ℃and above. |
Steelmaking process | Converter or electric furnace smelting and external refining | Converter or electric furnace smelting and external refining | Converter or electric furnace smelting and external refining,Vacuum degassing | Converter or electric furnace smelting and external refining,Vacuum degassing |
Chemical component | P≤0.030% S≤0.030% | P≤0.030% S≤0.030% | P≤0.025% S≤0.015% | P≤0.025% S≤0.015% |
Delivery condition | Hot rolling or annealing and normalizing | Hot rolling or normalizing | Normalizing rolling or Normalizing | Normalizing rolling or Normalizing |
NDT | Without compulsive requirements | Without compulsive requirements | LEVEL 3 UT | LEVEL 2 UT |
IMPACT PROPERTY | Without compulsive requirements | Without compulsive requirements | 0℃impact requirements | Room impact requirements |
Without compulsive requirements | Without compulsive requirements | Without compulsive requirements | F+P |
Inconclusion, 20 steel (it should be pointed out that G in the meaning of 20 G isthe boiler rather than high pressure). And In different standards, they allhave different requirements of the use scope, the steelmaking process, physicaland chemical properties, delivery status. Therefore, in order to choosesuitable products and services for our customers, in the process of purchasingand selling, we must communicate with customers about the product use andservice environment, etc.,
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