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ASTM A355 P9 11CR SERRATED FIN TUBE

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ASTM A355 P9 11CR SERRATED FIN TUBE

Country/Region	china
City & Province	ningbo zhejiang
Categories	Ventilation Fan Parts

Product Details

ASTM A355 P9 11CR SERRATED FIN TUBE

ASTM A355 is a standard specification for seamless ferritic alloy-steel pipe for high-temperature service. P9 refers to the grade of steel used in the pipe, which is a low alloy steel with chromium and molybdenum content.

11CR refers to the 11% chromium content in the steel, which provides enhanced corrosion resistance and high-temperature strength.

Serrated fin tube refers to a type of heat exchanger tube that has fins on the outer surface. These fins increase the surface area of the tube, allowing for more efficient heat transfer between the fluid inside the tube and the surrounding environment. The serrated design of the fins helps to improve heat transfer even further.

Heat Treatement Requirement

	P5, P9, P11, and P22
Grade	Heat Treatment Type	Normalizing Temperature Range F [C]	Subcritical Annealing
			or Tempering
			Temperature Range F
			[C]
P5 (b,c)	Full or isothermal Anneal
	Normalize and Temper	*****	1250 [675]
	Subcritical Anneal (P5c only)	*****	1325 - 1375 [715 - 745]
P9	Full or isothermal Anneal
	Normalize and Temper	*****	1250 [675]
P11	Full or isothermal Anneal
	Normalize and Temper	*****	1200 [650]
P22	Full or isothermal Anneal
	Normalize and Temper	*****	1250 [675]
P91	Normalize and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]
	Quench and Temper	1900-1975 [1040 - 1080]	1350-1470 [730 - 800]

Chemical Requirements

		Grade	P-5	P-9	P-11	P-22
Element		UNS Designation	K41545	S50400	K11597	K21590
	Carbon		0.15 max	0.15 max	0.05 - 0.15	0.05 - 0.15
	Manganese		0.30 - 0.60	0.30 - 0.60	0.30 - 0.60	0.30 - 0.60
	Phosphorous, max		0.025	0.025	0.025	0.025
	Sulfur, max		0.025	0.025	0.025	0.025
	Silicon		0.50 max	0.25 - 1.00	0.50 - 1.00	0.50 max
	Chromium		4.00 - 6.00	8.00 - 10.00	1.00 - 1.50	1.90 - 2.60
	Molybdenum		0.45 -0.65	0.90 - 1.10	0.44 - 0.65	0.87 - 1.13

APPLICATION OF ASTM A355 P9 11CR SERRATED FIN TUBE

ASTM A355 is a standard specification for seamless ferritic alloy-steel pipe for high-temperature service. P9 refers to the grade of steel used in the pipe, which is a low alloy steel with chromium and molybdenum content.

11CR refers to the 11% chromium content in the steel, which provides enhanced corrosion resistance and high-temperature strength.

Serrated fin tube refers to a type of heat exchanger tube that has fins on the outer surface. These fins increase the surface area of the tube, allowing for more efficient heat transfer between the fluid inside the tube and the surrounding environment. The serrated design of the fins helps to improve heat transfer even further.