hemos obtenido ISO 9001, ISO 14001, ISO 45001, CE, certificación de calificación crediticia de nivel AAA, etc.
ASTM A334/A334M Standard Specification for Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service.This specification 2 covers several grades of minimum-wall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification because heavier.
Chemical Composition
|
Element |
Composition, % |
||||||
|
Grade 1A |
Grade 3 |
Grade 6A |
Grade 7 |
Grade 8 |
Grade 9 |
Grade 11 |
|
|
Carbon, max |
0.30 |
0.19 |
0.30 |
0.19 |
0.13 |
0.20 |
0.10 |
|
Manganese |
0.40-1.06 |
0.31-0.64 |
0.29-1.06 |
0.90 max |
0.90 max |
0.40-1.06 |
0.60 max |
|
Phosphorus, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
|
Sulfur, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
|
Silicon |
|
0.18-0.37 |
0.10 min |
0.13-0.32 |
0.13-0.32 |
|
0.35 max |
|
Nickel |
|
3.18-3.82 |
|
2.03-2.57 |
8.40-9.60 |
1.60-2.24 |
35.0-37.0 |
|
Chromium |
|
|
|
|
|
|
0.50 max |
|
Copper |
|
|
|
|
|
0.75-1.25 |
|
|
Cobalt |
|
|
|
|
|
|
0.50 max |
|
Molybdenum |
|
|
|
|
|
|
0.50 max |
For each reduction of 0.01 % carbon below 0.30 %, an increase of 0.05 % manganese above 1.06 % will be permitted to a maximum of 1.35 % manganese.
Mechanical Properties
|
Mechanical Properties |
Grade 1 |
Grade3 |
Grade 6 |
Grade 7 |
Grade 8 |
Grade 9 |
Grade 11 |
|
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
|
|
Tensile Strength (min) |
380 |
450 |
415 |
450 |
690 |
435 |
450 |
|
Yield Strength(min) |
205 |
240 |
240 |
240 |
520 |
315 |
240 |
