The Seamless steel pipe for ship building usage are mainly used for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding.
Seamless steel tubes for ship-building refer to the ship building steel pipes which are designed and manufactured for boilers,super heaters and pressure systems of ship. The ship building steel pipes can be expansively used in various kinds of ships such as CCS,DNV,LR,GL,ABS,BV,RINA,NK as well as China national standards.
Types of steel tubes | Outer diameters | wall thickness | ||
Cold-rolled tubes | Rube size(mm) |
tolerances (mm) |
Tube sizes (mm) |
Tolerances (mm) |
>30-50 | ±0.3 | ≤30 | ±10% | |
>50-219 | ±0.8% | |||
Hot-rolled tubes | >219 | ±1.0% | >20 | ±10% |
Mechanocal properties:
Standard | Type of steel | Grade | Tensile strength (Mpa) |
Yield point(Mpa) not less than |
Elongation(%) not less than |
GB/T 5312 | Carbon & Carbon-Manganese | 320 | 320-440 | 195 | 25 |
360 | 360-480 | 215 | 24 | ||
410 | 410-530 | 235 | 22 | ||
460 | 460-580 | 265 | 21 | ||
490 | 490-610 | 285 | 21 | ||
China Classification Society (CCS) | 1Cr0.5Mo | 440 | 440-590 | 275 | 22 |
2.25Cr1Mo | 410 | 410-560 | 135 | 20 | |
490 | 490-640 | 275 | 16 |
Chemical compisition:
Grade | Steel Grade | C | Si | Mn | S | P | Residual element | |||||
Standard | Cr | Mo | Ni | Cu | Total | |||||||
GB/T 5312 | Carbon & Carbon-Manganese | 320 | ≤0.16 | ≤0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | ≤0.025 | ≤0.010 | ≤0.030 | ≤0.30 | ≤0.70 |
360 | ≤0.17 | ≤0.35 | 0.40-0.80 | ≤0.035 | ≤0.035 | ≤0.025 | ≤0.010 | ≤0.030 | ≤0.30 | ≤0.70 | ||
410 | ≤0.21 | ≤0.35 | 0.40-1.20 | ≤0.035 | ≤0.035 | ≤0.025 | ≤0.010 | ≤0.030 | ≤0.30 | ≤0.70 | ||
460 | ≤0.22 | ≤0.35 | 0.80-1.40 | ≤0.035 | ≤0.035 | ≤0.025 | ≤0.010 | ≤0.030 | ≤0.30 | ≤0.70 | ||
490 | ≤0.23 | ≤0.35 | 0.80-1.50 | ≤0.035 | ≤0.035 | ≤0.025 | ≤0.010 | ≤0.030 | ≤0.30 | ≤0.70 | ||
China Classification Society (CCS) | 1Cr0.5Mo | 440 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | 0.70-1.10 | 0.45-0.65 | ≤0.030 | ≤0.25 | Sn≤0.03 Al≤0.02 |
2.25Cr1Mo | 410 | 0.08-0.15 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | 2.00-2.50 | 0.90-1.20 | ≤0.030 | ≤0.25 | Sn≤0.03 Al≤0.02 |
|
490 | 0.08-0.15 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | 2.00-2.50 | 0.90-1.20 | ≤0.030 | ≤0.25 | Sn≤0.03 Al≤0.02 |
Other classifications of ships can also be provided after consulting with customers.
Seamless steel tube and pipe for ship building usage
Society | Standard or usage | Steel grade | chemical composition, % | |||||||||||
C | Si | Mn | P | S | Cr | Ni | Cu | Al | Mo | V | P+S | |||
GLR |
Non alloly | GL-R 410 | ≤ 0.21 |
≤ 0.35 |
≤ 1.40 |
≤ 0.025 |
≤ 0.020 |
- | - | - | ≥0.020 | - | - | - |
GB 18248 | 37Mn | 0.34 ~0.40 |
0.10 ~0.30 |
1.35 ~1.65 |
≤ 0.030 |
≤ 0.030 |
≤ 0.30 |
≤ 0.30 |
≤ 0.20 |
- | - | - | ≤ 0.055 |
|
EN 10297 | 34CrMo4 | 0.30 ~0.37 |
≤ 0.40 |
0.60 ~0.90 |
≤ 0.035 |
≤ 0.035 |
0.9 ~1.20 |
- | - | - | 0.15 ~0.30 |
- | - | |
DNV | for pressure ASTM A53/A53M | A53B | ≤ 0.30 |
- | ≤ 1.20 |
≤ 0.050 |
≤ 0.045 |
≤ 0.40 |
≤ 0.40 |
≤ 0.40 |
- | ≤ 0.15 |
≤ 0.08 |
- |
ABS |
for pressure | Grade 3 | ≤ 0.30 |
- | ≤ 1.20 |
≤ 0.050 |
≤ 0.045 |
≤ 0.40 |
≤ 0.40 |
≤ 0.40 |
- | ≤ 0.15 |
≤ 0.08 |
- |
BV | for pressure | 410HB | ≤ 0.21 |
≤ 0.35 |
0.40 ~1.20 |
≤ 0.040 |
≤ 0.040 |
- | - | - | - | - | - | - |
LR | for pressure | 410 | ≤ 0.21 |
≤ 0.35 |
0.40 ~1.20 |
≤ 0.045 |
≤ 0.045 |
≤ 0.25 |
≤ 0.30 |
≤ 0.30 |
- | ≤ 0.10 |
- | - |
KR |
for pressure | RST138 | ≤ 0.25 |
≤ 0.35 |
0.30 ~0.90 |
≤ 0.040 |
≤ 0.040 |
- | - | - | - | - | - | - |
RST142 | ≤ 0.30 |
0.30 ~1.00 |
≤ 0.040 |
≤ 0.040 |
- | - | - | - | - | - | - | |||
RST238 | ≤ 0.25 |
0.10 ~0.35 |
0.30 ~1.10 |
≤ 0.035 |
≤ 0.035 |
- | - | - | - | - | - | - | ||
RST242 | ≤ 0.30 |
0.30 ~1.40 |
- | - | - | - | - | - | - | |||||
RST249 | ≤ 0.33 |
0.30 ~1.50 |
- | - | - | - | - | - | - | |||||
RST338 | ≤ 0.25 |
0.30 ~0.90 |
- | - | - | - | - | - | - | |||||
RST342 | ≤ 0.30 |
0.30 ~1.00 |
- | - | - | - | - | - | - | |||||
NK | for pressure | grade 1 No3/ KSTPG 42 | ≤ 0.30 |
≤ 0.35 |
0.30 ~1.00 |
≤ 0.040 |
≤ 0.040 |
- | - | - | - | - | - | - |
CCS | for pressure | 360 | ≤ 0.17 |
≤ 0.35 |
0.40 ~0.80 |
≤ 0.040 |
≤ 0.040 |
≤ 0.25 |
≤ 0.30 |
≤ 0.30 |
≤ 0.10 |
|||
410 | ≤ 0.21 |
≤ 0.35 |
0.40 ~1.20 |
≤ 0.040 |
≤ 0.040 |
≤ 0.25 |
≤ 0.30 |
≤ 0.30 |
≤ 0.10 |
|||||
460 | ≤ 0.22 |
≤ 0.35 |
0.80 ~1.40 |
≤ 0.040 |
≤ 0.040 |
≤ 0.25 |
≤ 0.30 |
≤ 0.30 |
≤ 0.10 |
|||||
490 | ≤ 0.23 |
≤ 0.35 |
0.80 ~1.50 |
≤ 0.040 |
≤ 0.040 |
≤ 0.25 |
≤ 0.30 |
≤ 0.30 |
≤ 0.10 |
Appication:
Model N0.of major steel tubes
Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.
Our team is highly trained and experienced in servicing and producing all types of steel supplies.