A691 CHROME MOLY ELECTRIC FUSION WELDED (EFW) PIPE
Several grades designate the type of plate used; classes designate the type of heat treatment performed during the manufacture of the pipe, whether the weld is radiographically examined, and if the pipe has been pressure tested.
Product analysis of plate: The pipe manufacturer shall make an analysis of each mill heat of plate material. The product analysis shall meet the requirements of the plate specification to which the material was ordered.
Product analysis of weld: The pipe manufacturer shall make an analysis of the finished deposited weld material from each 200 feet or fraction thereof. Analysis shall conform to the welding procedure for deposited weld material.
Heat treatment
Classes 10, 11, 12 and 13 are not heat treated. All other classes must be heat treated according to the parameters shown below:
| 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 | 1100-1200 (590-650) | 1700 (925) | … | … |
| CM-70 | A204/A204M | 1100-1200 (590-650) | 1700 (925) | … | … |
| CM-75 | A204/A204M | 1100-1200 (590-650) | 1700 (925) | … | … |
| CMSH-70 | A537/A537M | 1100-1200 (590-650) | 1700 (925) | … | … |
| CMS-75 | A299/A299M | 1100-1200 (590-650) | 1700 (925) | … | … |
| CMSH-80 | A537/A537M | 1100-1200 (590-650) | A | 1700 (925) | 1100-1250 (590-675) |
| 0.5 CR | A387/A387M | 1100-1300 (590-705) | 1850 (1010) | 1700 (925) | 1150-1375 (620-745) |
| 1 CR | A387/A387M | 1100-1350 (590-730) | 1850 (1010) | 1700 (925) | 1150-1375 (620-745) |
| 1.25 CR | A387/A387M | 1100-1375 (590-745) | 1850 (1010) | 1700 (925) | 1150-1375 (620-745) |
| 2.25 CR | A387/A387M | 1200-1400 (650-760) | 1850 (1010) | 1700 (925) | 1250-1400 (675-760) |
| 3 CR | A387/A387M | 1200-1400 (650-760) | 1850 (1010) | 1700 (925) | 1250-1400 (675-760) |
| 5 CR | A387/A387M | 1200-1400 (650-760) | 1850 (1010) | 1700 (925) | 1250-1400 (675-760) |
| 9 CR | A387/A387M | 1325-1375 (715-745) | B | … | 1325-1375 (715-745) |
| 91 | A387/A387M | 1350-1420 (730-770) | 1900-2000 (1040-1095) | 1900 min (1040 min) | 1350-1440 (730-780) |
Permissible Variations in Wall Thickness and Weight
Dictated by the requirements of the specification to which the manufacturer ordered the plate.
Permissible Variations in Outside Diameter
Based on circumferential measurement +/-0.5% of the specified outside diameter.
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