GB T 5312 Carbon and carbon-manganese steel seamless steel tubes and pipes are mainly for ship use, also known as shipbuilding steel pipes. Under GB T 5312, there are mainly 5 steel grades: grade 320, 360, 410, 460 and 490. Each grade covers three levels: I, II, III.
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GB T 5312 Carbon and carbon-manganese steel seamless steel tubes and pipes are mainly for ship use, also known as shipbuilding steel pipes. Under GB T 5312, there are mainly 5 steel grades: grade 320, 360, 410, 460 and 490. Each grade covers three levels: I, II, III.
Approved classification society: ABS, LR, BV, DNV GL, RINA, CCS, NK, KR
GB T 5312 shipbuilding steel pipe chemical composition: %
| Grade | C | Si | Mn | S | P | Residual elements | ||||
| Cr | Mo | Ni | Cu | Total | ||||||
| 320 | ≦0.16 | - | 0.40~0.70 | ≦0.020 | ≦0.025 | ≦0.25 | ≦0.10 | ≦0.30 | ≦0.30 | ≦0.70 |
| 360 | ≦0.17 | ≦0.35 | 0.40~0.80 | |||||||
| 410 | ≦0.21 | ≦0.35 | 0.40~1.20 | |||||||
| 460 | ≦0.22 | ≦0.35 | 0.80~1.20 | |||||||
| 490 | ≦0.23 | ≦0.35 | 0.80~1.50 | |||||||
GB T 5312 shipbuilding steel pipe mechanical properties:
| Grade | Tensile strength (Mpa) | Yield strength (Mpa) | Elongation (%) |
| 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 |
GB T 5312 shipbuilding steel pipe grade level:
| Grade level | Grade I | Grade II | Grade III | |||
| Media | Design Pressure / Mpa | Design temperature / ℃ | Design Pressure / Mpa | Design temperature / ℃ | Design Pressure / Mpa | Design temperature / ℃ |
| > | - | ≦ | ||||
| Steam and Hot Oil | 1.6 | 300 | 0.7-1.6 | 170-300 | 0.7 | 170 |
| fuel | 1.6 | 150 | 0.7-1.6 | 60-150 | 0.7 | 60 |
| Other media | 4.0 | 300 | 1.6-4.0 | 200-300 | 1.6 | 200 |
| Note 1: When one of the design pressures and temperatures of the pipe meet the requirements of Class I in the table, it is designated as Class I. When both the design pressures and design temperatures of the pipe meet the requirements of Class II in the table, it is designated as Class II. Note 2: Other media refer to air, water, lubricating oil and hydraulic oil, etc.. Note 3: Seamless steel pipes for Class III piping systems can be manufactured in accordance with the national standards approved by the ship inspection department. |
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GB T 5312 shipbuilding steel pipe application
GB T 5312 shipbuilding steel pipes are used for the manufacture of marine boilers and superheater I, II, III pressure pipe system tubes, as well as the manufacture of LPG transport and bulk chemical ship pipes. The working temperature of GB T 5312 shipbuilding steel pipes wall is no more than 450 degrees.
BBN SHIP STEEL FACTORY
