Delivery Time:30-60 days
Certification:ABS,DNV,BV,GL,KR,CCS,LR,NK,RINA,RS

Carbon Steel Accurate Crankshaft Forging Heat Treatment For Marine

1st, Products:

marine crankshaft,diesel engine crankshaft,ship inspection crankshaft,large scale high precision marine crankshaft

2, Products reference:

Material	50Mn,DG20Mn,25Cr2Ni4MoV,34CrNiMo6
Max weight	50T
Application	Crankshaft is most important parts of engine,it take forces from connecting rod, transfer into torque and output to drive others part of engine
Melting process	EF+LF+VD
Production process	Forging+heat treatment+rough machining+finish machining
Forging ratio	≥3.5
Applicable standard	ASTM,ASME,DIN,JIS,ISO,BS,API,EN
Executive standard	JB/GB/EN/DIN/JIS/ASME/ASTM/ISO
Certification authority	ABS,DNV,BV,GL,KR,CCS,LR,NK,RINA,RS
Delivery term	Rough machining(N+T);finish machining(Q+T)
Test equipment	Spectrograph,UT device ,tensile and compact test machine,metalloscope,outside micrometer,bore dial indicator,hardness test machine
Service	Our service included the forging, process, heat treatment, finish machining, package, local logistics, customers clearance and maritime transport. We took the customer’s requirements as the principal thing, and pay attention on the products quality.

3, Custom properties

Material elements	C	Si	Mn	P	S	Cr	Ni	Mo	V
50Mn	0.48-0.56	0.17-0.37	0.70-1.00	≤0.035	≤0.035	≤0.25	≤0.30	--	-
DG20Mn	0.17-0.24	0.17-0.34	0.70-1.00	≤0.035	≤0.035	≤0.25	≤0.25	--
25Cr2Ni4MoV	≤0.25	≤0.23	≤0.53	≤0.006	≤0.004	≥1.62	≥3.75	≥0.33	≥0.09
34CrNiMo6	0.30-0.38	≤0.040	0.50-0.80	≤0.035	≤0.035	1.30-1.70	1.30-1.70	0.15-0.30

Mechanical property	Dia.(mm)	TS/Rm(Mpa)	YS/Rp0.2(Mpa)	EL/A5(%)	RA/Z(%)	Type Of notch	Impact energy	HBW
50Mn	Ø25	≥645	≥390	≥13	≥40	V	≥31	≤255HBS
DG20Mn	Ø25	≥450	≥275	≥24	≥50
34CrNiMo6	Ø15	750-900	450-600	≥13	≥55	V	-40℃≥20	≤269HBS

4, Process procedure:

Forging process flow quality control: Raw material steel ingot into warehouse(test the chemical content) → Cutting→ Heating(Furnace temperture test) → Heat treatment after forging(Furnace temperture test) Discharge the furnace(blank inspection)→ Machining→ Inspection(UT,MT,Visal diamention, hardness)→ QT→ Inspection(UT, mechanical properties, hardness, grain size)→ Finish machining→ Inspection (dimension)→ Packing and Marking(steel stamp, mark)→ Storage Shipment

5, Commerce clause

MOQ	1PC
Delivery time	30-60 days
Package	wood pallet,steel frame
Delivery term	FOB;CIF;CFR；DDU；
Payment term	T/T,LC
Type of shipping	By ocean,air

6, Keywords

Marine diesel engine crankshaft,crankshaft type ship inspection forging,crankshaft classification society certification,can be approved by big ten classifica