The steel for shipbuilding and oil platform---DH32 shipbuilding steel, is the high tensile strength steel.
It is the Hull structural steel,with it's good toughness properties, higher strength,strong corrosion-resistance,the processing properties,and welding properties.This kind of steel can be used in the manufacture of the ocean ship's hull structure whose weight is above 10000 tons.
DH32 steel Chemical Composition
| Grade | C max | Si max | Mn | P max | S max | Als min | Ti max | Cu max | Cr max |
Ni max |
Mo max |
| DH32 | 0.18 | 0.50 | 0.90-1.60 | 0.035 | 0.035 | 0.015 | 0.02 | 0.35 | 0.20 | 0.40 | 0.08 |
Note: Generally speaking CE will be ≤ 0.40%. If the delivery condition is TMPC, the CE will be : ≤ 0.36% (thickness ≤ 50mm),≤0.38%( when the thickness >50-100).
Ceq% =(C+Mn)/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
DH32 steel Mechanical Property
| Grade | Rm (MPa) |
Re(MPa) min | A% min | Akv/J min | ||||||
| DH32 | 440-570 | 315 | 22 | E.T °C | Thickness (mm) | |||||
| -20 | ≤ 50 | >50-70 | >70-100 | |||||||
| L | C | L | C | L | C | |||||
| 31 | 22 | 38 | 26 | 46 | 31 | |||||
Note: In the list , Rm: .tensile strength,Re: Yield strength,A%: elongation, E.T: experimental temperature,L: lengthways, C: crosswise.
DH32 steel plate Condition Of Delivery
| Grade | Fine grains elements | category | The thickness of steel | |||||
| ≤ 12 | >12.5-20 | >20-25 | >25-35 | >35-50 | >50-100 | |||
| DH32 | Nb+V or V | Plate/ sheet |
A(50) | N(50),CR(50),TM(50) | N(50),CR(25),TM(50) | |||
| Profile steel | N(50),CR(50),TM(50),AR*(25) | - | ||||||
| Al or Al+Ti | Plate/ sheet |
A(50) | AR*(25) | - | ||||
| N(50),CR(50),TM(50) | N(50),CR(25),TM(50) | |||||||
| Profile steel | A(50) | N(50),CR(50),TM(50),AR*(25) | - | |||||
Note: 1. delivery condition: A =Any ; N=Normalized ; CR=Control Rolled ; TM=TMPC, Temperature - deformation control rolling; AR*= Can be hot rolled with the agreement of Classification Society ; CR*=Can be control rolled with the agreement of Classification Society .
2. The Figure in the ( ) means the sampling volume to do the impact test, the unit is Ton.(-) means without impact test.
Contrast in the different standard
| ASTM A131M | TOCT 5521 | JIS G3106 | BS LR | GB712 |
| DH32 | D32 | SM490B SM490C |
DH32 | D32 |
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