A691 CM75 Chrome Moly Welded Pipe
A691 CM75 Chrome Moly Welded Pipe Description
ASTMA691 CM75 alloy welded pipe is a kind of electric fusion welded steel pipe widely used in high pressure and high temperature environment. Its manufacturing standard follows the A691 specification of the American Society for Testing and Materials (ASTM). This kind of steel pipe is mainly used in pipeline systems in industries such as petroleum, natural gas, chemical industry, and electric power, especially under conditions that need to withstand extreme working conditions.
In the material code of ASTMA691CM-75CL22 straight seam welded pipe, "CM" stands for chromium-molybdenum alloy steel, "75" means the minimum yield strength is 75ksi (about 517MPa), and "CL22" corresponds to the heat treatment process requirements.
According to the ASTM A691 standard, the steel pipe needs to undergo normalizing + tempering heat treatment to refine the grains and eliminate residual stress. Mechanical performance requirements include: tensile strength ≥90ksi (620MPa), elongation ≥18%, Charpy V-notch impact energy ≥54J (at -30℃). In addition, the steel pipe needs to pass 100% ultrasonic testing and eddy current testing to ensure that there are no defects.
A691 CM75 alloy steel EFW pipe specification
|
Product name |
Alloy Steel Pipe |
|
Grade of materials |
CM65, CM70. CM75, 1CR, 3CR, 5CR, 91 etc |
|
Standard |
ASTM A691 |
|
Certificate |
ISO, CE, API,etc. |
|
Trade clause |
FOB CIF EXW CFR |
|
Payment clause |
30% TT 70% final payment |
|
Final payment |
10-25days |
|
Market |
Russia Pakistan USA Japan Australian New Zealand Canada Korea India Singapore Algeria etc |
|
stock size |
Wall Thickness：0.6mm-75mm;Outer Diameter：8mm-610mm;Length：As customer requirements |
|
Trade clause |
FOB CIF EXW CFR |
|
payment clause |
30% TT 70% final payment |
|
Applications |
Water engineering, petrochemical industry, chemical industry, electric power industry,agricultural irrigation, and urban |
|
Surface treatment |
GalvanizedPVC black and color paintingTransparent oil ,anti-rust oilAccording to clients requirement |
Plates and standards used for steel pipes
| Steel Pipe Grade | Steel Type | Plate Standard ASTM | Steel Plate Grade |
Hardenss HB max |
| CM-75 | Carbon molybdenum steel | A204/A204M | Grade C |
201 |
•Hardness value suitable for S3
Heat treatment parameters
|
Steel Pipe Grade |
ASTM Standard |
Post-weld heat treatment Temperature (stress relief) °F (°C) |
Normalizing temperature max Except where otherwise specified °F (°C) |
Quenching temperature max Except otherwise specified °F (°C) |
Tempering temperature min °F (°C) |
| CM-75 | A204/A204M |
1100～1200 (590～650) |
1700 (925) |
- |
- |
Category number, heat treatment and inspection items
| Class | Heat Treatment on Pipe Section see: | Radiography, see Section |
Pressure |
| 10 | none | none | none |
| 11 | none | 9 | none |
| 12 | none | 9 | 8.3 |
| 13 | none | none | 8.3 |
| 21 | stress relieved, see 6.3.1 | none | none |
| 21 | stress relieved, see 6.3.1 | 9 | none |
| 22 | stress relieved, see 6.3.1 | 9 | 8.3 |
| 23 | stress relieved, see 6.3.1 | none | 8.3 |
| 31 | normalized, see 6.3.2 | none | none |
| 31 | normalized, see 6.3.2 | 9 | none |
| 32 | normalized, see 6.3.2 | 9 | 8.3 |
| 33 | normalized, see 6.3.2 | none | 8.3 |
| 40 | normalized and tempered, see 6.3.3 | none | none |
| 43 | normalized and tempered, see 6.3.3 | 9 | none |
| 43 | normalized and tempered, see 6.3.3 | 9 | 8.3 |
| 43 | normalized and tempered, see 6.3.3 | none | 8.3 |
| 50 | quenched and tempered, see 6.3.4 | none | none |
| 51 | quenched and tempered, see 6.3.4 | 9 | none |
| 52 | quenched and tempered, see 6.3.4 | 9 | 8.3 |
| 53 | quenched and tempered, see 6.3.4 | none | 8.3 |
A691 CM75 alloy steel pipe
Application fields and typical cases
ASTMA691CM-75 steel pipes are widely used in the following scenarios due to their excellent high temperature and high pressure resistance:
1. Oil and natural gas transportation: such as the acid gas gathering pipeline of an oil field in the Middle East, with a working pressure of 15MPa and a temperature of 120℃, which needs to resist H₂S corrosion;
2. Thermal power plants: high-temperature reheat steam pipelines for supercritical boilers, with a design temperature of 560℃ and a pressure of 4MPa;
3. Chemical equipment: the quench oil pipeline of an ethylene cracking unit needs to withstand 350℃ high temperature and sulfide corrosion.
Typical cases include the Khurais oil field project in Saudi Arabia, where the total length of the pipeline laid with ASTMA691CM-75 steel pipes exceeds 200 kilometers, with a pipe diameter of 24 inches and a wall thickness of 25.4mm. It has been successfully operated for 10 years without any failure records.
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