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Instruction
Material for Carbon Steel Seamless Tube:
Carbon and Alloy Steel, ferritic steel
Grade 1A, Grade3, Grade 4, Grade 6A, Grade 7A
Manufacture Method:
The pipes are made by seamless and welding process with the addition of no filler metal in the welding operation. So it can be both seam pipe and seamless pipe.
Grade 4 is manufactured by seamless process
Heat treatment:
All seamless and welded pipes, other than Grades 8 and 11, are heat treated to control their microstructure in accordance with methods of:
Normalizing
Quenched and Tempered
Double Normalized and Tempeed
TABLE 1 Chemical Requirements
Element |
Composition,% |
||||
Grade 1A |
Grade 3 |
Grade 4 |
Grade 6A |
Grade 7A |
|
Carbon, max |
0.30 |
0.19 |
0.12 |
0.30 |
0.19 |
Manganese |
0.40-1.06 |
0.31-0.64 |
0.50-1.05 |
0.29-1.06 |
0.90max |
Phosphorus,max |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
Sulfur,max |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
Silicon |
… |
0.18-0.37 |
0.18-0.37 |
0.10min |
0.13-0.32 |
Nickel |
… |
3.18-3.82 |
0.47-0.98 |
… |
2.03-2.57 |
Chromium |
… |
… |
0.44-1.01 |
… |
… |
Copper |
… |
… |
0.40-0.75 |
… |
… |
Aluminum |
… |
… |
0.04-0.30 |
… |
… |
Vanadium,max |
… |
… |
… |
… |
… |
Columbium,max |
… |
… |
… |
… |
… |
Molybdenum,max |
… |
… |
… |
… |
… |
Cobalt |
… |
… |
… |
… |
… |
A For each reduction of 0.01% carbon below 0.30%, an increase of 0.05% manganese above 1.06% would be permitted to a maximum of 1.35% manganese.
TABLE 2 Impact Temperature
Grade |
Minimum Impact Test Temperature |
|
°F |
°C |
|
1 |
-50 |
-45 |
3 |
-150 |
-100 |
4 |
-150 |
-100 |
6 |
-50 |
-45 |
7 |
-100 |
-75 |
8 |
-320 |
-195 |
9 |
-100 |
-75 |
10 |
-75 |
-60 |
11 |
-320 |
-195 |
Tests and Inspection:
Tensile Requirements
Impact Requirements
Mechanical Teing
- Sampling
- Transverse or Longitudinal Tensile Test and Flattening Test
- Hydrostatic Test
- Impact Test
Reference Documents:
ASTM A370 Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A999/A 999M Specification for General Requirements for Alloy and Stainless Steel Pipe
ASTM A671 Specification for Electric-Fusion-Welded Steel Pipe for Atmosphere and Low Tempearature
E 23 Test Methods for Notched Bar Impact Testing of Metallic Materials
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