ASTM A131 Grade B Marine Steel Plate/Coil for shipbuilding

ASTM A131 Grade B steel Description

ASTM A131 Grade B marine steel plates are one of the most widely used hull structural steel materials, which is almost exclusively used in the shipbuilding industry. The minimum yield point of A131 grade B shipbuilding steel plates is 34 ksi [235 Mpa], and A131 grade B hull steel belongs to general strength shipbuilding steel.

ASTM A131 Marine grade B steel plates are widely used in the shipbuilding industry because of their high cost performance, but their low corrosion resistance greatly affects their service life and service safety. Marine grade B steel plate is equivalent to Q235B grade steel plate.

ASTM A131 Grade B shipbuilding steel plate/coils are classified as medium and heavy plates, which are hot-rolled steel plates used to manufacture hull structures produced in accordance with the requirements of the classification society's construction specifications. First of all, good toughness is the most critical requirement for marine steel plates. In addition, high strength, good corrosion resistance, welding performance, processing and forming performance and surface quality are required. In order to ensure the quality and sufficient toughness, the Mn/C of the chemical composition is required to be above 2.5, and the carbon equivalent is also strictly required, and it is produced by a steel factory approved by the ship inspection department.

ASTM A131 Grade B steel Datasheet

Thickness: 3mm-150mm
Width: 1220 - 4220mm
Length: 5000-18000mm
Standard: ASTM A131
Classification Societies: ABS, LR, BV, DNV GL, RINA, NK, CCS, KR, RMRS
Surface Treatment: Clean, blasting and painting according to customer requirement
Export packing: Waterproof paper, and steel strip packed.
Standard Export Seaworthy Package.Suit for all kinds of transport,or as request
Capacity: 250,000 tons/year

ASTM A131 Grade B steel Chemical composition

(heat analysis, % max unless otherwise specified)

Notes: The contents of nickel, chromium, molybdenum, and copper are to be determined and reported. When the amount does not exceed 0.02 %, these elements may be reported as≤0.02 % .

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】%

ASTM A131 Grade B steel Mechanical Properties

Notes: Impact tests are not required when the material is produced using fine grain practice and normalized.

Equivalent Grade of ASTM A131 Grade B steel