GB 8163 steel pipe

GB 8163 steel pipe is a seamless steel pipe for fluid transportation (GB/T8163-2018), which is a general seamless steel pipe for conveying water, oil, gas and other fluids.

Diamensional Tolerances

Types of steel tubes	Outer diameter		Wall thickness
Cold-rolled tubes	Tube sizes(mm)	Tolerances(mm)	Tube sizes (mm)	Tolerances(mm)
	＞30-50	±0.3	≤30	±10％
	＞50-219	±0.8％
Hot-rolled tubes	＞219	±1.0％	＞20	±10％

Mechanical Properties(%)

Standard codes	Models of steel tubes	Tensite strength（MPa）	Yield strength（MPa）	Elongation（％）
GB/T8163	10	335-475	≥205	≥24
	20	410-550	≥245	≥20
	Q345	490-665	≥325	≥21

Chemical Composition(%)

Standard codes	Models of steel tubes	Chemical compositions（％）
		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	/	/	/

Additional Condition

• UT(Ultrasonic examination),
• AR(As Hot Rolled only)
• TMCP(Thermal Mechanical Control Processing)
• N(Normalized)
• Q+T(Quenched and Tempered)
• Z Direction Test(Z15,Z25,Z35)
• Charpy V-Notch Impact Test
• The Third Party Test (such as SGS Test)
• Coated or Shot Blasting and Painting.