ASTM A131 AH32 Ship Steel

Product Introduction

ASTM A131 AH32 is a common high-strength structural steel grade designed for shipbuilding and marine offshore structures. It delivers stable mechanical performance and excellent weldability, meeting standard structural requirements for vessel hulls and marine engineering constructions.

1. Production Size Range
Standard manufacturing dimensions for ASTM A131 AH32 steel plate are as follows:
Thickness: 4mm – 200mm
Width: 1000mm – 4000mm
Length: 4000mm – 12000mm

2. Chemical Composition
The chemical composition (mass fraction, %) of ASTM A131 AH32 steel is controlled strictly for production quality analysis, with element limits listed below:

A131 AH32 high Strength Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P (Max)	S (Max)	Al	N
A131 AH32	0.18	0.1-0.50	0.90-1.6	0.035	0.035	>0.015
	Nb	V	Ti (Max)	Cu (Max)	Cr (Max)	Ni (Max)	Mo (Max)
	0.02-0.05	0.05-0.10	0.02	0.35	0.20	0.40	0.08

2.1 Welding Performance Parameters
To evaluate welding crack sensitivity and carbon equivalent for production and welding process guidance:
Crack Sensitivity Coefficient (Pcm): Pcm = (C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B) %
Carbon Equivalent (Ceq): Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

3. Mechanical Properties
All mechanical indicators comply with ASTM A131 standard, including tensile properties and 0°C Charpy V-notch impact toughness for different thickness ranges:

Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
A131 AH32	mm	Min Mpa	Mpa	Min %	0°C	J	J
	t≤50	315	440–590	19%		34	24
	50＜t≤70	315	440–590	19%
	70＜t≤100	315	440–590	19%
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

4. Applications
ASTM A131 AH32 marine steel plate features stable strength, good ductility and reliable weldability. It is widely utilized in general shipbuilding construction, including ship hull structures, deck components and conventional marine auxiliary structural parts.