BCR295
Welded steel pipes that are manufactured by electric resistance welding of steel strips are continuously formed into square sections in the product of these Cold formed square hollow sections. (Certification No. MSTL-0509)
Product Specifications
1. Mechanical properties
| Product | Tensile test | Impact test [No. 4, longitudinal] |
|||||
|---|---|---|---|---|---|---|---|
| Thickness (mm) |
Yield strength (N/mm²) |
Tensile strength (N/mm²) |
Yield ratio (%) |
Elongation [No. 5] (%) |
Test temperature (℃) |
Charpy impact energy(J) | |
| BCR295 | 9≦ t ＜12 | 295≦ | 400≦ ≦550 |
– | 23≦ | 0 | – |
| 12≦ t ≦16 | 295≦ ≦445 |
≦90 | 27≦ | ||||
| 16＜ t ≦22 | 27≦ | ||||||
1. Tensile test pieces shall be taken from the central part of a side free of welded portions in the pipe axial direction.
2. Impact test pieces shall be taken from the central part of a side free of welded portions in the pipe axial direction such that the center of the test pieces is a quarter of the thickness from the outside surface. If this is not possible, then the test pieces shall be taken from a position as close to that position as possible. The cut shall be made in the thickness direction.
If test pieces of standard dimensions (10 mm square section) cannot be taken due to material reasons, 7.5 mm-wide sub size test pieces shall be used.
2. Chemical composition
| Product | C | Si | Mn | P | S | Total N | Carbon equivalent | Weld crack sensitivity composition |
|---|---|---|---|---|---|---|---|---|
| BCR295 | ≦0.20 | ≦0.35 | ≦1.40 | ≦0.030 | ≦0.015 | ≦0.006 | ≦0.36 | ≦0.26 |
* Unit (%)
1. Alloy elements other than those specified above may be added, as needed.
2. Total N may be contained up to 0.009% if free N is 0.006% or less after elements such as Al have been added to immobilize N.
3. Carbon equivalent can be calculated with cast analysis and the following equation.
Carbon equivalent
Ceq (%) = C + Mn/6 + Si/24 + Ni/40 + Cr/5 + Mo/4 + V/14
4. Upon agreement between the parties concerned with delivery, weld crack sensitivity composition can be used instead of carbon equivalent. In this case, the weld crack sensitivity composition can be calculated with cast analysis and the following equation. Weld crack sensitivity composition
Pcm (%) = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 + 5B
3. Manufacturing size
| Size/Thickness(mm) | 9 | 12 | 16 | 19 | 22 |
|---|---|---|---|---|---|
| 250×250 | ○ | ○ | ○ | ||
| 300×300 | ○ | ○ | ○ | ○ | |
| 350×350 | ○ | ○ | ○ | ○ | ○ |
| 400×400 | ○ | ○ | ○ | ○ | ○ |
| 450×450 | ○ | ○ | ○ | ○ | |
| 500×500 | ○ | ○ | ○ | ○ | |
| 550×550 | ○ | ○ | ○ | ○ |
- Other Lineup
- Cold roll formed square hollow sections for building structure
