42CrMo4 Alloy Steel Plate 10-800mm Round Bar 200-2200mm Width for Shipbuilding Applications

Price Negotiable

Price: 800 - 9000 USD / ton

MOQ: 5T

Delivery Time: 60-75days

Brand: HDT

Product Description

42CrMo4/4140/1.7225/SCM 440 Alloy Steel Plate - High-performance alloy steel plate specifically engineered for shipbuilding applications, available with black surface, grinded, or machined finishes.

Equivalent Grades

GB	DIN	AISI	JIS
42CrMo	1.7225	4140	SCM440

42CrMo4 alloy steel plate for shipbuilding applications

Key Characteristics

Supplied in quenched and tempered conditions
Excellent machinability for precision manufacturing
High toughness and impact resistance
Superior creep strength for demanding applications
Repeated impact resistant capability

Applications

Ship plates and marine structural components
Gear wheels and pinions for marine propulsion
Connecting rods and critical mechanical parts
High-toughness components for mechanical engineering

Chemical Composition

Element	Content (%)
C	0.38-0.43
Si	0.40 max
Mn	0.60-0.90
Cr	0.90-1.20
Mo	0.15-0.30
P	≤0.035
S	≤0.035

Available Sizes

Round steel bar: 10-800mm diameter
Flat steel bar: 10-400mm thickness × 200-2200mm width

Surface Conditions

Black surface
Grinded finish
Machined surface

Hardness Specifications

Annealed: HBS 217 max

Heat Treatment Guidelines

Forging: Heat to 1150°C, hold until uniform, minimum forging temperature 850°C, cool slowly in ashes or sand
Annealing: Heat to 830°C-850°C, cool in furnace
Normalising: Heat to 870°C-900°C, cool in still air
Stress Relieving: Annealed: 600°C-650°C; Hardened: 500°C-550°C; Cool in still air
Hardening: Heat to 830°C-880°C, quench in oil or polymer
Tempering: Heat to 450°C-700°C, cool in still air (avoid 200°C-420°C range to prevent temper brittleness)