A691 1/2CR CLASS41 alloy steel pipe
A691 1/2CR CL41 efw pipe
A691 1/2CR CL41 Chrome Moly Welded Pipe

A691 1/2CR Class41 Alloy Steel Pipe

A691 1/2CR Class 41 welded pipe is an electric fusion welded alloy steel pipe for high temperature and high pressure specified in the American Society for Testing and Materials (ASTM) standard.

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Product Introduction

A691 1/2CR CL41 alloy welded pipe is a chromium-molybdenum alloy pipe for high temperature and high pressure specified by the American Standard.
Grade 41 steel pipe should be uniformly heated to the austenitizing temperature range and not exceed the maximum normalizing temperature shown in Table 2, and then air-cooled at room temperature. After normalizing, the steel pipe should be reheated to the minimum tempering temperature shown in Table 2 and kept at a temperature of at least 1/2 h/in.
[0.2hr/cm] thickness or 1/2h, whichever is greater, and then air-cooled.

TABLE 1 Plate Materials
Pipe Grade	Type of Steel	ASTM Specification		HB, max A
		Number	Grade
1 ⁄ 2 CR	1 ⁄ 2 % chromium, 1 ⁄ 2 % molybdenum steel	A387/A387M	2	201

TABLE 2 Heat Treatment Parameters A
Pipe Grade	ASTM Specification	Post-Weld Heat-Treat Temperature Range (StressRelieving), °F (°C)	Normalizing Temperature, max unless otherwise noted, °F (°C)	Quenching Temperature, max unless otherwise noted,°F (°C)	Tempering Temperature, min, °F(°C)
1 ⁄ 2 CR	A387/A387M	1100 to 1300 [590 to 705]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]

Class designations are as follows
Class	Heat Treatment on Pipe	Radiography, see Section	Pressure Test, see Section
41	normalized and tempered, see 5.3.3	9	none

Applications of A691 1/2CR Class41 Pipe

oil pipeline

Chemical Plant

power plant

Due to its good high temperature performance and strength, A691 1/2CR Class41 welded pipe is often used in high temperature and high pressure piping systems in the petroleum, chemical, electric power and other industries, such as heating furnace tubes in refineries, heat transfer tubes in steam generators, reactor pipes in chemical plants, etc.

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