ASTM A691 EFW Carbon And Alloy Steel Pipe_pipe

Description

ASTM A691 / A691M – 19 EFW Carbon and Alloy Steel Pipe for High-Pressure Service at High Temperatures

This specification covers carbon and alloy steel pipe, electric-fusion-welded with filler metal added, fabricated from the pressure-vessel-quality plate of several analyses and strength levels, and suitable for high-pressure service at high temperatures. Heat treatment may or may not be required to attain the desired mechanical properties or to comply with applicable code requirements. Supplementary requirements are provided for use when additional testing or examination is desired.

The specification nominally covers pipe 16 in. [400 mm] in outside diameter and larger with wall thicknesses up to 3 in. [75 mm] inclusive. Pipes having other dimensions may be furnished provided it complies with all other requirements of this specification.

Dimensions: OD: NPS 16″ – 60″ WT: 8 – 75mm Length: 5.8 – 12m

Class designates the type of heat treatment performed in the manufacture of the pipe, whether the weld is radiographically examined, and whether the pipe has been pressure tested as listed below:

Class designations are as follows (Note 1):

Class	Heat Treatment on Pipe	Radiography, see Section	Pressure Test, see Section
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

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
½ CR	½% chromium, ½% molybdenum steel	A387/A387M	2	201
1CR	1% chromium, ½% molybdenum steel	A387/A387M	12	201
1 ¼CR	1 ¼% chromium, ½% molybdenum steel	A387/A387M	11	201
2 ¼CR	2 ¼% chromium, 1% molybdenum steel	A387/A387M	22	201
3CR	3% chromium, 1% molybdenum steel	A387/A387M	21	201
5CR	5% chromium,½% molybdenum steel	A387/A387M	5	225
9CR	9% chromium, 1% molybdenum steel	A387/A387M	9	241
91	9% chromium, 1% molybdenum, vanadium, columbium	A387/A387M	91	241
^A Hardness values listed are applicable to S3.

Heat Treatment Parameters^A

Pipe Grade	ASTM Specification	Post-Weld Heat-Treat Temperature Range (Stress Relieving), °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]
½ CR	A387/A387M	1100 to 1300 [590 to 705]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]
1 CR	A387/A387M	1100 to 1350 [590 to 730]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]
1 ¼CR	A387/A387M	1100 to 1375 [590 to 745]	1850 [1010]	1700 [925]	1150 to 1375 [620 to 745]
2 ¼CR	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]

^AWhere ellipses (…) appear in the table, there is no requirement.

^BRequires quenching and tempering.

^C9 CR steel is an air-hardenable steel, at times retaining austenite down to near atmospheric temperature.

Good practice is to allow the steel to cool to 150°F or lower before subjecting the steel to a tempering treatment or post-weld heat treatment.

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