GB 712 AH40 shipbuilding steel is a kind of high strength structural steel for ships and ocean engineering. Hot rolled GB 712 AH40 steel products are supplied in plates, sheets, angles steel bars, steel channels, H beams and bulb flats.
GB 712 AH40 Shipbuilding Steel Specification
Standard: GB 712-2011
Material: GB 712-2011 AH40
Category: ships and ocean engineering structural steel
Shapes: GB 712 AH40 plate, GB 712 AH40 sheets, GB 712 AH40 coils, GB 712 AH40 steel angles, GB 712 AH40 H beams, GB 712 AH40 bulb flats
AH40 Shipbuilding Steel Plates Size
Thickness: 4mm to 150mm,
Width: 1200mm to 4000mm
Length: 3000mm to 18000mm
AH40 Shipbuilding Steel Chemical Composition in GB 712-2011 standard
| Grade | The element content (%) | ||||||
| C | Si | Mn | P | S | Al | N | |
| GB 712AH40 | 0.18 Max. | 0.1-0.50 | 0.90-1.60 | 0.030 Max. | 0.030 Max. | 0.015 Min. | - |
| Nb | V | Ti | Cu | Cr | Ni | Mo | |
| 0.02-0.05 | 0.05-0.10 | 0.02 Max. | 0.35 Max. | 0.20 Max. | 0.40 Max. | 0.08 Max. | |
Crack Sensitivity: Pcm = (C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B)%
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
AH40 Shipbuilding Steel Mechanical Properties in GB 712-2011 standard
| Grade | Mechanical Properties | Charpy V Impact Test | |||||
| Thickness | Yield | Tensile | Elongation | Degree | Energy 1 | Energy 2 | |
| GB 712AH40 | mm | Min Mpa | Mpa | Min % | 0 | KV₂/J | KV₂/J |
| t≤50 | 390 | 510-660 | 20% | 27 | 41 | ||
| 50＜t≤70 | 390 | 510-660 | 20% | 31 | 46 | ||
| 70＜t≤150 | 390 | 510-660 | 20% | 37 | 55 | ||
| Note: Energy 1 is transverse impact test, Energy 2 is longitudinal impact test | |||||||
The GB 712-2011 standard specifies the classification and grade, order content, size, shape, weight and allowable deviation, requirements, inspection and test, packaging, marking and quality certificate of structural steel for ships and marine engineering. This standard is applicable to the manufacture of GB 712AH40 steel plates with thickness of not more than 150 mm, GB 712AH40 steel sheets and strips less than 25.4 mm and GB 712AH40 steel profiles with diameter not more than 50 mm for the navigation vessels, fishing vessels and marine engineering structures in the ocean, coastal and inland river navigation areas.
AH40 shipbuilding steel plates in GB 712-2011 standard are applicable to the hull structure of ships in ocean, coastal and inland rivers.GB 712-2011 AH40 shipbuilding steel products also can be used for ship repairing, the offshore oil drilling platform, the platform pipe joints and other components. We can supply GB 712AH40 shipbuilding steel plates with nine marine class certifications ABS, BV, LR, DNV, CCS, GL, NK, KR, and RINA class society.
