A691 11/4CR CLASS50 TUBE

A691 Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures

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Product Introduction

TABLE 1 Plate Materials
Pipe Grade	Type of Steel	ASTM Specification		HB, max A
Pipe Grade	Type of Steel	Number	Grade	HB, max A
CM-65	carbon-molybdenum steel	A204/A204M	A	201
CM-70	carbon-molybdenum steel	A204/A204M	B	201
CM-75	carbon-molybdenum steel	A204/A204M	C	201
CMSH-70	carbon-manganese-silicon steel, normalized	A537/A537M	1
CMS-75	carbon-manganese-silicon steel	A299/A299M	. . .	. . .
CMSH-80	carbon-manganese-silicon steel, quenched and tempered	A537/A537M	2
1 ⁄ 2 CR	1 ⁄ 2 % chromium, 1 ⁄ 2 % molybdenum steel	A387/A387M	2	201
1CR	1 % chromium,1 ⁄ 2 % molybdenum steel	A387/A387M	12	201
1 1 ⁄ 4 CR	1 1 ⁄ 4 % chromium,1 ⁄ 2 % molybdenum steel	A387/A387M	11	201
2 1 ⁄ 4 CR	2 1 ⁄ 4 % chromium, 1 % molybdenum steel	A387/A387M	22	201
3CR	3 % chromium, 1 % molybdenum steel	A387/A387M	21	201
5CR	5 % chromium,1 ⁄ 2 % molybdenum steel	A387/A387M	5	225
9CR	9 % chromium, 1 % molybdenum steel	A387/A387M	9	241
91	9 % chromium, 1 % molybdenum, vanadium, niobium C	A387/A387M	91 B	241

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)
CM-65	A204/A204M	1100 to 1200 [590 to 650]	1700 [925]	. . .	. . .
CM-70	A204/A204M	1100 to 1200 [590 to 650]	1700 [925]	. . .	. . .
CM-75	A204/A204M	1100 to 1200 [590 to 650]	1700 [925]	. . .	. . .
CMSH-70	A537/A537M	1100 to 1200 [590 to 650]	1700 [925]	. . .	. . .
CMS-75	A299/A299M	1100 to 1200 [590 to 650]	1700 [925]	. . .	. . .
CMSH-80	A537/A537M	1100 to 1200 [590 to 650]	B	1700 [925]	1100 to 1250 [590 to 675]
1 ⁄ 2 CR	A387/A387M	1100 to 1300 [590 to 705]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]
1CR	A387/A387M	1100 to 1350 [590 to 730]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]
11 ⁄ 4 CR	A387/A387M	1100 to 1375 [590 to 745]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]
21 ⁄ 4 CR	A387/A387M	1200 to 1400 [650 to 760]	1850 [1010]	1700 [925]	1250 to 1400 [675 to 760]
3CR	A387/A387M	1200 to 1400 [650 to 760]	1850 [1010]	1700 [925]	1250 to 1400 [675 to 760]
5CR	A387/A387M	1200 to 1400 [650 to 760]	1850 [1010]	1650 [900]	1300 to 1400 [705 to 760]
9CR	A387/A387M	1325 to 1375 [715 to 745]	C	. . .	1325 to 1375 [715 to 745]
91	A387/A387M	1350 to 1420 [730 to 770]	1900 to 2000[1040 to 1095]	1900 min[1040 min]	1350 to 1440 [730 to 780]

Class designations are as follows
Class	Heat Treatment on Pipe	Radiography, see Section	Pressure Test, see Section
10	none	none	none
11	none	9	none
12	none	9	8.3
13	none	none	8.3
20	stress relieved, see 5.3.1	none	none
21	stress relieved, see 5.3.1	9	none
22	stress relieved, see 5.3.1	9	8.3
23	stress relieved, see 5.3.1	none	8.3
30	normalized, see 5.3.2	none	none
31	normalized, see 5.3.2	9	none
32	normalized, see 5.3.2	9	8.3
33	normalized, see 5.3.2	none	8.3
40	normalized and tempered, see 5.3.3	none	none
41	normalized and tempered, see 5.3.3	9	none
42	normalized and tempered, see 5.3.3	9	8.3
43	normalized and tempered, see 5.3.3	none	8.3
50	quenched and tempered, see 5.3.4	none	none
51	quenched and tempered, see 5.3.4	9	none
52	quenched and tempered, see 5.3.4	9	8.3
53	quenched and tempered, see 5.3.4	none	8.3