20 #(Grade 20) seamless steel pipe

product introduction:
20 # seamless steel pipe is widely used in petrochemical and other industries for its excellent performance and suitable price. 20 #. There are national standards such as seamless steel tubes for fluid transportation (GB / t8163-2008), seamless steel tubes for low and medium pressure boilers (gb3087-2008), seamless steel tubes for petroleum cracking (gb9948-2013) and seamless steel tubes for high pressure fertilizer equipment (gb6479-2013).

There are great differences in price and effect of 20 # seamless steel pipes of different standards. At present, the price of 20 # seamless steel pipes manufactured according to GB 6479-2013 is about 1000 yuan / ton higher than that manufactured according to GB / T 8163-2008.

What are the standards for 20 # seamless steel pipes?
(1) GB / t8163-2008 seamless steel pipe for fluid transportation
(2) gb3087-2008 seamless steel tubes for low and medium pressure boilers
(3) seamless steel tubes for petroleum cracking (GB / T 9948-2013)
(4) seamless pipe for high pressure fertilizer equipment (GB / T 6479-2013)
(5) GB / T 5310-2017 seamless steel tubes for high pressure boilers (in the standard, the steel number is 20g; G refers to boiler steel tubes)

Chemical Composition of 20 # Seamless Steel Pipe:

Standard	Chemical composition
	C	Si	Mn	Cr	Mo	Ni	Cu	V	P	S
				≤
GB/T8163	0.17-0.23	0.17-0.37	0.35-0.65	0.25	--	0.30	0.25	--	0.035	0.035
GB/T 9948					0.15	0.25	0.20	0.08	0.025	0.015
GB/T 6479

Mechanical Properties of 20 # Seamless Steel Pipe:

Standard	Mechanical Properties
	Tensile strength/MPa	Yield strength/MPa			Elongation		KV2/J
		S≤16mm	16-30mm	＞30mm	Portrait	Transverse	Portrait	Transverse
		≥					Test temperature/℃  0℃
GB/T8163	410-530	245	235	225	20		---
GB/T 9948	410-550	245			24	22	≥40	≥27
GB/T 6479	410-550	245	16-40mm	＞40mm	24	22	≥40	≥27
			235	225

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