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Petroleum Cracking Tube

Standard:GB9948-1988

Application: For manufacturing of furnace tubes, heat exchangers and pipelines in refineries

Tolerance on Dimensions

Pipe Types	Pipe Size (mm)		Tolerances
Hot Rolled	OD	≤159	±1.0%
	OD	>159	±1.20%
	WT	≤20	±12.5%
	WT	>20	±10.0%
Cold Drawn	OD	≤30	±0.20mm
		30-50	±0.30mm
		>50	±0.8%
	WT	≤3	+12% -10%
	WT	>3	±10%

Chemical composition and mechanical properties

Grade	Chemical Composition								Mechanical Properties
Grade	C	Mn	Si	Cr	Mo	Ni	S	P	Tensile Strength(Mpa)	Yield Strength(Mpa)	Elongation(%)
10	0.07-0.14	0.35-0.65	0.17-0.37	≤0.15	-	≤0.25	≤0.035	≤0.035	330-490	≥205	≥24
20	0.17-0.24	0.35-0.65	0.17-0.37	≤0.25	-	≤0.25	≤0.035	≤0.035	410-550	≥245	≥21
12CrMo	0.08-0.15	0.40-0.70	0.17-0.37	0.40-0.70	0.40-0.55	≤0.30	≤0.035	≤0.035	410-560	≥205	≥21
15CrMo	0.12-0.18	0.40-0.70	0.17-0.37	0.80-1.10	0.40-0.55	≤0.30	≤0.035	≤0.035	440-640	≥235	≥21
1Cr2Mo	≤0.15	0.30-0.60	0.50-1.00	2.15-2.85	0.40-0.65	-	≤0.035	≤0.035	≥390	≥175	≥22
1Cr5Mo	≤0.15	≤0.60	≤0.60	4.00-6.00	0.45-0.60	≤0.60	≤0.035	≤0.035	≥390	≥195	≥22

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