National Standards Tube for Chemical Fertilizer Equipments Standard GB6479 Application It is excellent quality carbon steel, low alloy steel and alloy steel pipes for high pressure fertilizer equipments and pipelines. Main Steel Tube Grades 20, 16Mn, Q345 etc. Chemical Composition

Grade	Chemical Composition %
	C	Si	Mn	P	S
20	0.17-0.24	0.17-0.37	0.35-0.65	≤0.030	≤0.030
16Mn	0.12-0.20	0.20-0.60	1.20-1.60	≤0.030	≤0.030

Mechanical Properties

Grade	Mechanical Properties
	Tensile Strength MPa	Yield Strength MPa	Elongation %
20	410-550	≥245	≥24
16Mn	490-670	≥320	≥21