Dalian Shipbuilding Heavy Industry Co., Ltd. was rated as a national new product

Recently, two significant maritime projects developed by Dalian Shipbuilding Industry Group Co., Ltd. have gained recognition and acclaim. The 400-foot water-depth jack-up rig and the 76,000-ton Panamax-type finished product/crude oil ship were both evaluated and approved by the Ministry of Science and Technology, earning the prestigious title of "National New Product of 2007." These achievements mark a major milestone in China's marine engineering and shipbuilding industry. The 400-foot jack-up drilling platform is a groundbreaking development that has filled a critical domestic gap. It significantly enhances China’s capability to explore and develop marine resources, while also strengthening the supply chain for key marine engineering projects. This innovation plays a vital role in supporting the country’s energy security strategy and contributes to the sustainable growth of the shipbuilding sector. Moreover, it opens up new opportunities and creates additional economic value in the marine engineering field. On the other hand, the 76,000-ton Panamax-type product oil tanker represents a competitive and standardized vessel designed to meet global market demands. Its successful development not only boosts Dalian Shipbuilding’s position in the heavy oil tanker market but also helps secure a stronger foothold in the international shipping industry. By introducing a ship with independent intellectual property rights, the company strengthens the overall technological capabilities of the domestic shipbuilding industry, setting a new benchmark for quality and innovation. These two projects demonstrate the growing strength and technical expertise of Chinese shipbuilders on the global stage, reinforcing their ability to compete and innovate in an increasingly complex maritime environment.

Bimetallic Barrel

Centrifugal casting or rotocasting is a casting technique that is typically used to cast thin-walled cylinders. It is chiefly used to manufacture rotationally symmetric stock materials in standard sizes for further machining, rather than shaped parts tailored to a particular end-use.

Technical Parameters

Product Name : Bimetallic Barrel

Material: JYN3 + JYK Series Alloy

Suitable Machine: Injection / Extrusion / Blowing ...

Available Size: Φ < 500mm, L < 8,000mm

Process Method: Centrifugal Casting

Surface Hardness: 52-62 HRC

Surface Roughness: < Ra 0.8

Screw Straightness: < 0.02mm/m

Advantages

By casting and sintering high quality alloy powder on barrel inside surface with thickness1.5-2.0mm, screws can get higher performance in both wearing & corrosion resistant performance.

Application

General plastics & engineering plastics with below 70% glass fibre filling.

JYK Series Alloy

At this stage, we have JYK-1, JYK-2 and JYK-3 alloy types and treatments for wear fighting

TYPE	COMPONENTS	HARDNESS (HRC)	Abrasive RESISTANCE	Corrosion resistance	applications
JYK-1, C	Fe, Cr, Ni	56 – 60	x	x	Recycling & engineering plastics, reinforced additives less than 20%.
JYK-2, B	Ni, W, Cr	58 – 62	xx	xx	Moderate corrosive, reinforced additives less than 35%
JYK-3, D	Ni, W, Cr	60 – 64	xxx	xx	High abrasive and moderate corrosive plastics

Suitability: (x good) to (xxx excellent).

TYPE	INGREDIENTS (WEIGHT %)
	Cr	C	Fe	B	Si	W *	Mn	Ni	Others
JYK-1, C	8	1.2	Bal	4.3	4	/	0.65	10.8	< 1.0
JYK-2, B	8	1.4	5	4	3.3	16.5	0.5	Bal	< 1.0
JYK-3, D	8	1.4	5	4	3.3	40	0.5	Bal	< 1.0

*Highest composition of tungsten carbide can go up to 45%, which enables the barrels have 5 times wear-resistance capability than normal bimetallic barrels and up to 60% glass fibre filling in general & engineering plastics materials.

Bimetallic Barrels,Bimetallic Barrel Casting line,Extruder Bimetallic Parallel Twin Screw

Ningbo Jinyi Precision Machinery Co., Ltd. , https://www.jinyi-machinery.com