Phone: +8621 3378 0199
E-mail:sales@sunnysteel.com
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% |
Standard code |
Models of steel tubes |
Tensile strength(MPa) |
Yield strength(MPa) |
Elongation(%) |
GB/T5312 |
320 |
320~410 |
≥195 |
≥25 |
360 |
360~480 |
≥215 |
≥24 | |
410 |
410~530 |
≥235 |
≥22 | |
460 |
460~580 |
≥265 |
≥21 | |
490 |
490~610 |
≥285 |
≥21 |
Standard code |
Models of steel tubes |
Chemical compisition(%) | ||||
C |
Si |
Mn |
P |
S | ||
GB/T5312 |
320 |
≤0.16 |
≤0.35 |
0.40~0.70 |
≤0.035 |
≤0.035 |
360 |
≤0.17 |
≤0.35 |
0.40~0.80 |
≤0.035 |
≤0.035 | |
410 |
≤0.21 |
≤0.35 |
0.40~1.20 |
≤0.035 |
≤0.035 | |
460 |
≤0.22 |
≤0.35 |
0.80~1.40 |
≤0.035 |
≤0.030 | |
490 |
≤0.23 |
≤0.35 |
0.80~1.50 |
≤0.035 |
≤0.030 |
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 |
residual elements:Cr≤0.25%,Mo≤0.10%,Ni≤0.30%,Cu≤0.30%aggregate≤0.70%
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Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.