GB/T 38713-2020 in English
VALIDMedium manganese steel plate for offshore platform structure
- Issued on:2020-03-31
- Implemented on:2020-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
《GB/T 38713-2020海洋平台结构用中锰钢钢板》由TC183（全国钢标准化技术委员会）归口，TC183SC6（全国钢标准化技术委员会钢板钢带分会）执行，主管部门为中国钢铁工业协会。
Introduction
Analysis of the core content of the standard
This standard is applicable to medium manganese steel plates specially used for offshore platforms with a thickness range of 20mm to 150mm, which are delivered in three process states: TMCP+tempering, online quenching+tempering or offline quenching+tempering.
Characteristics of the brand system
The four-segment coding of "Q+strength value+ZM+quality grade" is adopted:
- Q690ZME: medium manganese steel with yield strength of 690MPa, grade E quality
- Z-direction performance extension: such as Q690ZMEZ35 means additional Z35-level thickness direction performance
Comparison of key technical requirements
| Performance indicators | Q550ZM | Q620ZM | Q690ZM |
|---|---|---|---|
| Yield strength (MPa) | ≥550 | ≥620 | ≥690 |
| Mn content (%) | 3.50-5.00 | 3.50-5.50 | 4.00-6.50 |
| Pcm value (≤) | 0.34(≤50mm) | 0.39(≤50mm) | 0.44(≤50mm) |
| -60℃ impact energy (J) | 69(longitudinal) | - | 69(longitudinal) |
Key points of engineering application
Welding process control
Based on the stringent requirement of Pcm≤0.44%, it is recommended that:
- Preheating temperature ≥100℃ (for plate thickness 50mm)
- Use low-hydrogen welding materials
- Dehydrogenation treatment after welding
Key points of quality acceptance
- Ultrasonic testing shall be carried out in accordance with GB/T2970, and 100% testing is required for Z-direction steel
- Thickness direction performance Z35 grade requirements ψz average value ≥35%
- Surface defect depth ≤ half of thickness tolerance
Background of standard evolution
This standard is designed for the harsh service environment (corrosion + dynamic load) of offshore platforms. It improves low-temperature toughness while ensuring strength through the Mn-C-Al alloy system design. Compared with traditional high-strength steel, the welding cold crack sensitivity index of medium manganese steel is reduced by 15%-20%.
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