The Amazing Qualities of Super Duplex

September 20th, 2011

Super duplex stainless steel was first developed for use in the sulphite paper industry in Sweden over 70 years ago. Today it is recognised as being an improvement on duplex stainless steel because its higher alloy content provides it with increased resistance levels to the potentially destructive effects of pitting, crevice and stress corrosion and cracking. In addition, it is also significantly stronger than normal stainless steel and duplex stainless steel.

Physical properties
Super duplex’s amazing physical properties allow it to resist corrosion fatigue, enjoy higher thermal conductivity and experience low coefficients of thermal expansion to a far greater degree than austentic stainless steels. Furthermore, tests have also shown that super duplex has high energy absorption, high strength, very effective resistance to sulphide stress corrosion and is ideal for welding. In addition, the high chromium levels present in super duplex stainless steel makes it far more resistant to acid chlorides and caustic solutions than other stainless steels. Naturally, this helps to make it the ideal solution for the most strenuous environments. In fact, these robust properties make it a very real replacement option for nickel based steels or 300 grade stainless alloys.

Chemipetro
We here at Chemipetro are one of the largest stockholders and manufacturers of super duplex pipes, fittings, fasteners and associated products in the United Kingdom. To view our extensive range of high-quality products in more detail, take some time to browse through the relevant pages here on our easy-to-use website.

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Reap the Benefits of Duplex Pipe Fittings

June 21st, 2011

When you are selecting items to help you run your machinery, such as seamless steel tube and other such offerings, you no doubt want to get the most suitable offerings produced using the very best materials.

After all, there is no point in spending your hard-earned money on provisions that are in some way unsuitable.

Here at Chemipetro, we provide a vast array of products in a range of materials, including duplex stainless steel. Whether you are looking for pipes, weld fittings, fasteners or anything else, we might well have the perfect solution for you.

There are many advantages associated with items fashioned from this substance. For example, duplex grade stainless steel is around twice as strong as regular austenitic or ferritic steel. Meanwhile, because it contains less nickel and molybdenum than austenitic offerings it can often be cheaper.

Also, due to its added strength, less of the material has to be used, meaning structures can be thinner and lighter.

Of course, when it comes to seamless steel tube and other such offerings, you can choose from other materials too. By taking a look around our website and finding out a little more about the respective properties of the metals, you might be able to come to a decision concerning what you are seeking.

Also, you can always get in touch with our friendly and expert team by phone if you have any questions about the products we offer. This means you shouldn’t struggle to make the ideal selection for your company.

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Why Choose Duplex or Super Duplex?

June 3rd, 2011

If you are seeking a particularly strong grade of stainless steel, a recommended material is duplex grade stainless steel.

Duplex is around twice as strong as normal steel, known as ferritic or austenitic, and also has a resistance to corrosion that ranks alongside certain austenitic steels. However, it contains less molybdenum and nickel and is therefore cheaper.

Duplex, because of its light weight and reduced section thicknesses, finds many uses, particularly in the gas and oil industry. It is also popular with companies working in high chloride or marine environments, and is suitable – in a variety called lean duplex – for storing ethanol.

Around 70 years ago, scientists in Scandinavia developed super duplex stainless steels to be used in the sulphite paper business. Super duplex has an extremely high tensile strength, and can beat ordinary steels in corrosion resistance by a long chalk.

Super duplex’s low thermal expansion rates make it suitable for components that undergo heat changes, such as heat exchangers and cooling pipes.

At Chemipetro Ltd, duplex and super duplex are among the materials we use extensively – we are among largest stockholders and manufacturers of flanges, pipe, pipe fittings, fasteners and associated products in duplex, super duplex and high nickel alloys.

As experts in this field, we can advise on the correct products and materials for your project, and also provide everything you need to get the job done. Our website is packed with detailed information, and we pride ourselves on maintaining the most exemplary of standards.

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Super Duplex Sets the Standards

May 6th, 2011

As a leading worldwide industrial supplier of super duplex stainless steel, our researchers and engineering teams are more than encyclopaedic on the properties, functions and common uses of super duplex. But what are the benefits, in simple terms?

Qualities
Super duplex stainless steel embodies remarkable strength, resistance to crevice corrosion and pitting/stress cracking, workability, high thermal conductivity, high energy absorption, low thermal expansion, and resistance to sulphide stress corrosion in a single material. This makes it ideal for use in the production of mechanical and structural components.

Make-Up
The inherent make-up of the duplex family of stainless steels covers a range of qualities in terms of corrosion resistance that depends upon their alloy content. They are roughly twice as strong as austenitic or ferritic steels. Super duplex is formed from a mixed microstructure of almost equal fractions of austenite and ferrite, rather making it the best-in-class of the duplex family. Exemplary corrosion performance makes the duplex family – in particular super duplex – ideally suited to application in the marine industries.

Industrial Applications
Super duplex stainless steel pipes contending materials to the post financially thanks to its higher yield strength (savings are possible through reduced weight etc.) Super duplex is often the material of choice in the marine and fossil fuel industries. A few examples include heat exchangers in desalination plants, high strength resistant wiring, mining pipes for the transport of fossil fuels, and chemical oil tanks.

The duplex stainless steel family has seen success across the industrial board thanks to a potent combination of desirable qualities and cost effectiveness.

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Dynamic Duplex

February 26th, 2011

Chemi Petro makes use of duplex stainless steel alloys which are just perfect for use in products such as seamless pipe, flanges, butt welded pipe and socket weld and screwed pressure fittings. We also make extensive use of super duplex stainless steel, which was developed in the 1980s to replace the first generation of duplex stainless steel materials.

Super duplex steel has many advantages: it is extremely high strength, is completely resistant to pitting and corrosion, will not crack or corrode and has a high thermal conductivity. Super duplex also has a high energy absorption rate and is easily weld-able and workable.  We also make use when it is appropriate, of premium titanium and regular traditional stainless steel. We only work with the very best materials and carefully consider which is the best material for each  particular product.

Our considerable experience in the manufacturing industry puts us in the ideal position to have a great depth of knowledge of the unique properties of each material as well as the foresight to recognize new developments early as far as new high tech materials are concerned.

Whether you need to order regular products from our comprehensive range or require a bespoke solution to a particular problem, we always enjoy the challenge of turning a problem into an opportunity to hone our specialist skills. For more details and in order to obtain a quote, please contact us via our website today at www.chemipetro.co.uk.

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Classic Chemipetro

February 24th, 2011

Chemipetro Limited is the United Kingdom’s largest manufacturer and stockholder of a superb range of pipes, pipe fittings, flanges,  fasteners and all associated products such as tie rods.

We also manufacture high quality specialist plant such as Mazak turning centres, Bridgeport vertical machining centres , Missler automatic band saws and sensotronic vapour degreasers. Our fantastic flanges conform to all major recognized standards such as Shell ES247 and NORSOK M650 and we can easily manufacture bespoke flanges to absolutely any specification for any installation in the world. Our flanges are of the highest quality and we have the capacity and skills needed to complete emergency orders at very short notice. Furthermore, all of our flanges can be supplied with grooves, bevels, backfaces and bores inlaid with a variety of alloys by fully qualified and highly experienced welders.

Our pipes are also absolutely premium; we can supply NB pipe and OD tube in a huge variety of wall thicknesses as well as specialist pipe for difficult grades, heat exchanger tubes and heavy wall thicknesses. Of course, all of our pipe can be produced in varying grades, including duplex/super stainless, stainless steel and exotic alloys such as incoloy and titanium. For more information on all of our products and our high tech manufacturing processes, please take a look a tour website at www.chemipetro.co.uk today. Whether you can a take advantage of our off the peg products or require a specialist solution to a particular problem, we are definitely always happy to help.

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What is Duplex Stainless Steel?

February 21st, 2011

There are very few people who have not heard of stainless steel. After all, many common items in homes, gardens and workplaces around the world are made from this material. Its properties have made it popular among manufactures and consumers alike.

Indeed, here at Chemipetro we use the substance in many of our products, such as flanges and pipe fittings.

However, unlike its more well known sibling, duplex stainless steel remains somewhat mysterious for many people.

This metal gets its name because it has a two-phase microstructure that consists of grains of ferritic and austenitic stainless steel.

It has a number of properties that make it attractive to manufacturers of flanges, pipe fittings and other such things. For example, it is around twice as strong as regular versions of the metal and it is also significantly tougher and more ductile.

As with other types of stainless steel, its corrosion resistance depends mainly on its specific composition.

Meanwhile, the duplex versions are very good at resisting corrosion cracking.

In terms of cost, it can be cheaper because of its lower alloying content and this is particularly the case during times of high alloy surcharges. Also, because of its enhanced strength, it is often possible to reduce the section thickness, meaning less of it needs to be used.

For this reason, both cost and weight savings can sometimes be achieved compared with other forms of stainless steel.

So, if you have not yet begun using products made from this metal, now may be a good time to start. To find out more about the products we offer, have a look at the relevant section of our website.

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Monel 400

January 15th, 2011

At Chemipetro we produce a wide range of pipes, pipe fitting and flanges to meet the demanding needs of the petro chemical industry as well as other industrial users. We manufacture products from a wide range of materials such as duplex and super duplex stainless steels to meet these specialist needs. These specialist stainless steels have increased strength and corrosion resistance over regular steels which are needed for some of the harsh environments they are to be used in.

Sometimes, however, even these specialist stainless steels are not adequate and it is necessary to use even more specialist materials which we refer to as ‘exotic alloys’. One such material is Monel 400.

This alloy, which is primarily composed of Nickel and Copper with a small amount of iron and other trace elements, was developed by the International Nickel Company and patented in1906. It was named after the president of the company Ambrose Monell. One L was dropped as at that time the patent office did not allow use of people’s names for products.

Monel is extremely resistant to corrosion and can therefore be used in the harshest of environments. However it has two main drawbacks.

The first is that it is difficult to work compared to steel. It work hardens very quickly and so has to be machined very slowly and at low feed rates.

The second is that it is prone to galvanic corrosion when installed adjacent to steel in marine environments. Great care therefore has to be taken in its use. However, where it can be used its greater strength can be of great benefit.

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Use of Swivel Flanges

January 12th, 2011

Using flanges to connect sections of pipelines together is a relatively simple affair. First of all the flanges are welded on to the end of the pipe section and then the two flanges are bolted together. What could be more straightforward?

This is how it works in theory. In practice it is not so easy. Flanges are held together by a number of bolted connections located around the circumference of the flange plates. If one section of pipework is not connected and is free to rotate then it is relatively easy to rotate the flanges to make sure the bolt holes align. However, if both sides are fixed to something else then this is not so simple.

On dry land it is possible to put the flanges in place first and then weld the pipe in place, ensuring that the alignment of the flanges is correct. Alternatively, a slip on flange could be fitted which is free to rotate around the pipe. However, if these operations have to be carried out under water by a diver as happens with marine oil production it is a very different matter.

For these instances the swivel flange was developed. Unlike a slip on flange the flange ring is actually fixed to the pipe and so needs less man handling to get it into position. Also unlike a slip on flange, swivel flanges can be manufactured to withstand higher pressures.

At Chemipetro we manufacture a range of swivel flanges to be sure to meet you need whether used at sea or on dry land.

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Lap Joint Flanges

January 6th, 2011

At Chemipetro we manufacture a wide range of pipes, pipe fittings and flanges from a range of materials for use with liquids which can sometimes be very corrosive and rapidly destroy most steel pipes.

However, these special materials do not come cheap. The more exotic alloys that are sometimes required are expensive and difficult to work, and so are available only at a cost premium. The pipeline designer is therefore always on the lookout for ways to reduce costs and one such way is to use lap joint flanges.

Most pipe joints are welded, but flanges are employed on pipe connections which require to be dismantled. A flange normally consists of an inner section the same size as the pipe and an outer ring with bolt holes. Two flanges are placed face to face with a gasket between and securing bolts used to tighten the two rings together. From this it can be seen that the only part of the flange that comes into contact with the liquid being transported is the inner pipe section. Therefore, why not make the inner section and the outer ring separately? This is exactly how a lap joint flange works.

A stud pipe section made from the same material as the pipe is welded onto the end of the pipe. The flange is slipped onto the stub end before it is fixed in place and is held on by a rim on the end of the stub. The flange itself can then be made from a cheaper material as it is not subject to the same corrosion as the pipe.

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