What is the Difference between Marine Steel ABS Grade A and Mild Steel Q235B

The mild steel Q235B is also widely used for shipbuilding nowadays instead of marine steel?ASTM A131/A131M grade A plates. It is important to know their difference so that you can make a better choice and decision.

First, let us check their chemical composition and mechanical properties:

Q235B and ABS Grade A Chemical composition %

Q235B and ABS Grade A Mechanical properties

In general, the ABS Grade A shipbuilding plates and Q235B mild steel plates almost have no big difference in chemical composition and mechanical properties. That is why a lot of clients can also accept to use of Q235B carbon steel if they have no strict requirement for classification society certificates. Under such conditions, the Q235B has advantages such as fast delivery and lower price also.

But if the user requires a classification society certificate, Q235B will not work anymore. It must be?marine material ABS Grade A. Show you an ABS Gr. A classification society certificate and you will understand it:

Please check certificate No. In the top right corner and ABS stamp as well as a signature in the lower right corner. You can take certificate No. and check with the ABS classification society in any country about the authenticity of the marine grade plates mentioned in the Mill Test Certificate/ ABS classification society certificate.