 
 
	
	
Implementation Standards
	
Seamless steel tubes for fluid transport (GB/T8163-2008) are general seamless steels for water, oil, gas and other fluids
	
 
Applicable Scope
	General
 boiler tubes are mainly used to make water wall tubes, boiling water 
pipes, superheated steam pipes, superheated steam pipes used for 
locomotive boilers, big and small smoke pipes and arch brick pipes, 
etc..
The
 high pressure boiler tube is mainly used to manufacture high-pressure 
and ultrahigh pressure boiler superheater, reheater pipe, main steam 
pipe etc..
However,
 the circular tube also has some limitations, such as under the 
condition of plane bending, the round tube is not as good as square and 
rectangular tube bending strength, some agricultural machinery skeleton,
 steel and wood furniture are commonly used square, rectangular tube. 
Special shaped steel tubes with different cross section shapes are 
needed for different purposes. 
	
Chemical Composition
	
| 
					Standard 
				 | 
					Grade 
				 | 
					Chemical composition of fluid tube 
				 | |||||||
| 
					C 
				 | 
					Si 
				 | 
					Mn 
				 | 
					P 
				 | 
					S 
				 | 
					Cr 
				 | 
					Ni 
				 | 
					Cu 
				 | ||
| 
					GB/T8163 
				 | 
					10 
				 | 
					0.07~0.14 
				 | 
					0.17~0.37 
				 | 
					0.35~0.65 
				 | 
					≤0.035 
				 | 
					≤0.035 
				 | 
					≤0.15 
				 | 
					≤0.25 
				 | 
					≤0.25 
				 | 
| 
					20 
				 | 
					0.17~0.24 
				 | 
					0.17~0.37 
				 | 
					0.35~0.65 
				 | 
					≤0.035 
				 | 
					≤0.035 
				 | 
					≤0.25 
				 | 
					≤0.25 
				 | 
					≤0.25 
				 | |
| 
					Q345 
				 | 
					0.12~0.20 
				 | 
					0.20~0.55 
				 | 
					1.20~1.60 
				 | 
					≤0.045 
				 | 
					≤0.045 
				 | 
					/ 
				 | 
					/ 
				 | 
					/ 
				 | |
	
Mechanical Property
| 
						Standard 
					 | 
					Grade 
				 | 
					Tensile Strength(Mpa) 
				 | 
					Yield Strength(Mpa) 
				 | 
					Elongation(%) 
				 | 
| 
					GB/T8163 
				 | 
					10 
				 | 
					335~475 
				 | 
					≥205 
				 | 
					≥24 
				 | 
| 
					20 
				 | 
					410~550 
				 | 
					≥245 
				 | 
					≥20 
				 | |
| 
					Q345 
				 | 
					490~665 
				 | 
					≥325 
				 | 
					≥21 
				 | 
	
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