ERW Pipe are divided into many different kinds. Following is their difference and various usage. Welded steel pipe: also known as pipe, it is made by bending steel sheet or strip, and then welded. According to the weld form it is divided into Longitudinal and spiral pipe.By end-use it is divided into general pipe, galvanized pipe, oxygen lance pipe, wire casing, metric pipe, roller pipe, deep well pump tubes, automobile tubes, transformers pipes, welding thin-walled tube, welding shape tube and spiral welded pipe.

1.    General pipe: General pipe are used to transport low pressure fluid, we also call it black pipe. Material is almost of Q195A, Q215A, Q235A. Or some other easily welded mild steel. Pipes must be conducted the experiment of the pressure, bending, flattening and surface quality. Generally the delivery length is 4-10m, and often be required to deliver special length (or double length). Specifications of welded pipe with nominal diameter (millimeters or inches) are different with the actual. As to the wall thickness of pipe, there are ordinary steel pipe and thicker steel pipe. By the form of pipe end, there are sub-threaded and threaded. With the technology of welded steel pipe to improve and processing be more simply, some welded pipe can replace part of the seamless pipe. And we can produce pipes of outer diameter up to 219mm (8 inch) right now.

2.       Galvanized steel pipe: in order to improve the corrosion resistance of steel pipes, we always coat some zinc on the surface of general steel pipe, that is galvanized pipe. There are two division of galvanized pipes: hot-dipped and electro-galvanized. The zinc coating of hot-dipped galvanized is thicker than electrical. But the latter is less cost.

3.       Blowing Oxygen: The pipe is used for blowing Oxygen in steelmaking. generally are small diameter pipes. And sizes are almost eight kinds from 3/8 inch to 2 inch. Material are almost 08,10,15,20 or Q195 AT-of Q235. For corrosion resistance, some pipes are aluminized.

4.       Electric wire conduit: Generally it is common welded carbon steel pipe and used in concrete and a variety of structure and distribution projects. The nominal diameter are from 13mm to 76mm. The wall thickness is thin and mostly coated or galvanized. And cold bending test has been requested.

5.       Metric pipe: The specifications are always the same with seamless pipe, that is OD*wall thickness(mm), Material are almost of ordinary carbon steel, quality carbon steel or general tropical low-alloy steel. Welding or cold-drawing after welding. Metric pipe are divided into ordinary used and thin-wall. Ordinary used pipes are used as structural components, such as drive shafts and transmission fluid. Thin-wall pipes are used in the production of furniture and lamps, etc., But it has to ensure the strength and bending tests of the steel pipe.

6.       Roller tube: The roller tube is used for belt conveyor, usually the material are Q215, Q235A, B-grade steel and 20# steel. Diameter are from 63.5mm to 219.0mm. It has certain requirements curvature, end perpendicular to the centerline and ellipticity. Always it should be conducted the general pressure and flattening test.

7.       Transformer tube: The transformer tube is used for transformer cooling pipes and other heat exchangers, material is almost ordinary carbon steel. The tubes should be conducted the flattening, flaring, bending, and hydraulic test. Transformer tubes are required to cut to length or double length delivery, there are certain requirements for curvature of tubes.

8.       Shaped tubes: The material are almost ordinary carbon structural steel or 16Mn. Shapes are always square, rectangular, cap and tubes for doors and windows. The shaped tubes are mainly used for agricultural components and steel window and door.

9.       Welding thin-walled tube: Welding thin-walled tube is mainly used to make furniture, toys, lamps, etc.. In recent years, the applications of stainless thin-walled tubes is very wide range, like fine furniture, decorative material and fence.

10.   Spiral welded steel pipe: Spiral welded pipe is produced to roll the low-carbon structural steel or low alloy steel strip according to the angle of the spiral line (called the forming angle) rolled into the tube and then welded together, It can produce large diameter steel pipe by narrow strip. Spiral welded pipe is mostly used for oil and gas pipelines, Its specification is always of OD * wall thickness. There are two welding forms of spiral welded pipes, that is one-sided and double-sided welding. the pipe should be conducted test of hydrostatic, the weld tensile strength and cold bending performance.

Forum: Buying and Selling Steel ]]> http://forum.worldsteelprices.com/post?id=5793908 Thu, 12 Apr 2012 01:57:50 GMT http://forum.worldsteelprices.com/post?id=5761191

Forum: Questions & Answers ]]> http://forum.worldsteelprices.com/post?id=5761191 Tue, 20 Mar 2012 10:12:01 GMT http://forum.worldsteelprices.com/post?id=5741798

One of my old customer said that a galvanized steel coil mill made a very simple package of the goods, and when arrived, customer opened the package and found that the surface of coils are all wet, or even water droplets. This will affect the normal use of galvanized roll. It’s really terrible. Below are some notes, according to my experience, I would like to share with everyone refer to the package of the galvanized rolls. 

Galvanized steel coil packaging are divided into horizontal packaging and vertical packaging. The main difference lies in the vertical packaging with a wooden tray or iron under it, in order to make the reinforcement of galvanized coils in containers more solid. Of course, horizontal packing is also safety, because when loaded into containers, it will be reinforced by different ways. No matter horizontal or vertical, the packing of roll is same.

One: Waterproof paper. Waterproof paper is wrapped in the surface of a galvanized roll. Its main function is to prevent galvanized volume moisture, and avoid water vapor into the volume, then influence of hot dip galvanized coil surface. Such as zinc oxide layer when water vapor, can appear on the zinc spend turned white, affect beauty and using. This layer is necessary for the waterproof.

Two: Galvanized steel layer. It’s out of waterproof paper. During the transportation progress, it’s very easy to hit. This layer is to prevent the scratch on the surface.

Three: Edge Protection layer.  It is on the both sides of the roll, and made of iron. It’s mainly to protect the edge of galvanized roll. It’s very important, if the edge of galvanized steel coil wasn’t protected, might affect the deep processing, and even damage the machine.

Four: Straps. It is used to fix the waterproof paper and galvanized iron packaging, avoid the iron fall off. For galvanized roll with the width of 1000mm to 1500mm, it should be 8 straps and transverse 4 pieces, vertical 4 pieces. It’s the best way to tighten the rolls. S

Five: Tags/Marks. Mill tags will be stick on every coils outside the packages. Including: name of commodity, grade, gross weight, net weight, roll number, and information of the mill, supplier information, etc. It’s will be helpful for clients to find the right rolls against the packing list.

Above all is the detailed info for the packing, and hopefully it will be helpful for you to choose suppliers for galvanized steel coils. Indeed, whatever you choose the galvanized steel coil or galvanized steel sheet, these experiences above can be noticed, as long as you do the packaging services better, customers can satisfy with our steel products and steel prices  better.

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5741798 Wed, 07 Mar 2012 02:37:51 GMT http://forum.worldsteelprices.com/post?id=5718224 hello all.

we have the above subject materials on offer ever month, if there are any interested party's please feel free to contact myself on robby@chickssm.co.za  the volumes monthly of each product ranges between 1/2000 tons a month.

further details and picture's/packing lists can be supplied for serious buyers

regards

Robby mcclelland.

Forum: Buying and Selling Steel ]]> http://forum.worldsteelprices.com/post?id=5718224 Tue, 21 Feb 2012 00:17:35 GMT http://forum.worldsteelprices.com/post?id=5654048

When choosing the type of Steel Sheet you need for the correct application, it is important to decide the basic properties your Steel Sheet must have in order for it to fit its application perfectly.

Galvanized Steel Sheet is the chosen product for domestic appliances, building applications, roofing, automotive parts (e.g. underbody), lighting fixtures, drums and so on. The reason why is simple: Galvanized Steel Sheet has excellent anti corrosive properties.

Galvanized Steel Sheet is produced by submerging Steel Sheet in a bath of molten zinc. Due to its high level of zinc coating, which is often preferred in 275grams/sqm for many European applications, Galvanized Steel Sheet is the first weapon of choice for manufacturing products that must be rust resistant, such as roofing, which is highly exposed to the elements.

Other Steel Sheet, such as Hot Rolled Sheet and Cold Rolled Sheet would not be a wise choice for such purposes, as it does not have any rust protection. Indeed, the base Steel Sheet for making Galvanized Steel Sheet is either Hot Rolled Steel Sheet or Cold Rolled Steel Sheet, but the hot dip galvanizing process simply must be applied to this base Steel Sheet in order for it to gain the anti corrosive properties needed.

If you take a step back and think about how many products in day to day life are created out of Galvanized Steel Sheet you’d be quite amazed. One of the easy ways to spot Galvanized Steel Sheet on an appliance or building application is to look for its trademark “Spangle”. Galvanized Steel Sheet will either be made with zero spangle, small spangle, regular spangle or big spangle.

So what is “spangle” you may ask?

Due to the hot dip galvanizing process, crystallites are produced and create an aesthetic feature known as spangle, which varies with the number of particles added for the heterogeneous nucleation and the rate of cooling in the hot dip process. The appearance you get on the Galvanized Steel Sheet are small or large patchy crystal effects.

If you take a look at the inside of a toaster or the inside of an air vent, you’ll be able to spot the tell tale sign of Galvanized Steel Sheet.

One other important use of Galvanized Steel Sheet, that must be mentioned, is its use as a base metal for further painting to be applied. A lot of manufacturers will order Prepainted Galvanized Steel Sheet, rather than first ordering the Steel Sheet and painting it themselves. The painting of Galvanized Steel Sheet acts as a further layer of corrosive protection and is also necessary in aesthetic terms, as Steel Sheet looks far better on an appliance in a nice smooth colour such as white or red.  

It’s easy to find Prepainted Galvanized Steel Sheet around the house. You’ll see it on the white refrigerator in the kitchen and the red lawnmower in the garden. Prepainted Galvanized Steel Sheet is a much loved product for many manufacturers and the beauty of buying Steel Sheet instead of Steel Coil, is that you can buy it pre-cut from the coil in the exact sizes of sheet you need, ready to be easily manufactured into your product. Galvanized Steel Sheet is readily available in the following sizes:

0.15 – 4.5mm Thick

600 to 1500mm Wide

1000 to 6000mm Long

If you’ve decided Galvanized Steel Sheet is the product for you, then why not check out a supplier of Galvanized Steel Sheet via this link---SteelFromChina.com. This company has been in the steel sheet business for many years and has even included photos of Galvanized Steel Sheet shipments they've made around the world.

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5654048 Mon, 09 Jan 2012 09:59:03 GMT http://forum.worldsteelprices.com/post?id=5648073 Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE

Now the application of steel has a long history, with the development of advanced technology, there will be more and more iron and steel products are produced. In additon to frequently used steel pipe, steel tube, steel sheet, there is another steel product which is becoming wide to use, that is steel coil, because it is facilitate storage and transport, it has been widely used.

Steel coil, also called as rolled coil, is produced from hot rolled steel, cold roll forming. It is known that steel coil is convenient to store, transport and process, and there are lots of companies interested in it, such as you can easily process it into plate, strip, etc.

Generally speaking, steel coil is divided into hot rolled coil and cold rolled coil. Hot rolled coil is pre-recrystallization in the billet processed products. Cold rolled coil is a follow-up process of hot rolled coil and steel coil weight is usually around 15-30T. Besides, the general user does not have open-book device or the amount is limited. Therefore, follow-up coil processing industry will be promising.

Hot rolled coil is the beginning of rolling slab continuous casting slab or as raw material, the reheating furnace heating, high pressure water descaling into the roughing mill, roughing material by cutting head, tail, re-entering the finishing mill, the implementation of computer controlled rolling. The performance of hot rolled products is so good, such as high strength, good toughness, easy processing and good weldability molding, etc. Therefore, it is widely used in ships, cars, bridges, buildings, machinery, pressure vessels and other manufacturing industries.

In contrast, cold rolled coil is at room temperature directly into a certain thickness of the rolling roll with a rolling machine and rolled into the entire volume of the strip. Usually, it is used in in automobile manufacturing, machinery manufacturing, light industrial, civil and construction, etc.

In additon, there are many related products of steel coil, according to the different application, they all play a key role in production. For example, galvanized steel coil owns excellent corrosion resistance, paint, decoration and good formability, it is widely used in construction, household appliances, vehicles, container manufacturing, mechanical and electrical industry, to almost all areas related to basic necessities. In recent years, increasing demand for galvanized steel coil, production increased quickly in the United States, Japan and other steel producing countries, galvanized steel coil occupys a high proportion.

Certainly, there are all kinds of steel coil, like galvalume coil, PPGI, PPGL, etc. because of different fucnitons or featrues, they can be used different areas and play an important role. If you want to know more related information about steel coil, you can visit the site: SteelFromChina.com

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5648073 Thu, 05 Jan 2012 06:38:56 GMT http://forum.worldsteelprices.com/post?id=5633068

It is known that steel can give a lot of benefits in our life and working, like our building, all kinds of house, it is more important for us is that steel can keep building structure safer, besides, it is a kind of economic and environmental material. For most of people, they know a little about the features and categories of steel, the article will provide some detail introduction about steel features, functions and categories, and some related trend of steel suppliers, steel prices, etc.

In fact, the original steel production might trace back to about 4000 years ago in Anatolia. With the development of technology, the modern steel production starts in Europe. Because steel is made of mostly iron and carbon, besides, it also contains various other elements of the other metals like tungsten, manganese, and chromium, etc.

As we all know that according to the different carbon content, Iron-carbon alloy steel and cast iron into two types, steel is the carbon content of 0.03% to 2% of the iron-carbon alloys.

Carbon steel is the most commonly used ordinary steel, smelting convenient, easy processing, low cost, and in most cases to meet the requirements, the application is very common. And the use of steel in accordance with different, steel can also contain structure steel, tool steel and special steel.

Because Mild steel which is also called low carbon steel can be easy to accept a variety of processing like forging, cutting, and welding etc, therefore, it gets a vast application in many areas. Especially, now in China Steel Suppliers, like famous Baosteel, BaoLAI, AnGang Steel, Benxi Steel, etc can provide high quality mild steel for the whole world.

Certainly, iron and steel industry is a constantly dynamic process, especially Steel Prices are accompanied by economic development and change. Due to the global financial crisis, national steel production has decreased, especially in China and Japan, but for China, the export of steel is relatively stable. That is the reason that more and more world customers try to cooperate with China Steel Manufacturers.

If steel is categorized by product, it will contain more colorful kinds, like galvanized steel pipe, stainless steel tube, silicon steel coil, stainless steel sheet, angle steel, flat steel, cold rolled steel, seamless steel tube or pipe, etc.

Forum: Buying and Selling Steel ]]> http://forum.worldsteelprices.com/post?id=5633068 Fri, 23 Dec 2011 10:19:38 GMT http://forum.worldsteelprices.com/post?id=5623891

Forum: Questions & Answers ]]> http://forum.worldsteelprices.com/post?id=5623891 Fri, 16 Dec 2011 10:21:29 GMT http://forum.worldsteelprices.com/post?id=5595926
In very brief, our specialisation and expertise lies in trading in all kinds of metals, metals related semi-products and by-products. Just to name a few of the items which we would be handling specifically are as follows;

Primary copper : copper cathodes, copper wire bars,8mm copper rods, copper tubes of various dimensions.

Copper scraps : shinny mill berry, burnt berry, heavy copper, candy, telephone birch, birch, birch/cliff, refinery copper, remelted copper ingots, copper dross.

Primary aluminium : P1020 ingots and sows, a356 ingots,6063 and 6061 billets, primary aluminium 9mm rods of various specification, aluminium sheets, and aluminium foils of various dimensions.

Secondary aluminium
Alloys : wheel alloy a356, piston alloy ac8a/lm13, aluminium silicon master alloys 50/50,60/40,70/30, gravity die casting alloys lm6, lm16, lm20, pressure die casting alloys adc12, ac2c, ac4b, din 226, din239 etc.



FOR MORE INFORMATION GET BACK TO US VIA MAIL
wasterecyclingfirstclass008@live.com

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5595926 Sat, 26 Nov 2011 12:25:10 GMT http://forum.worldsteelprices.com/post?id=5595914


Send us mail to Scraptradelimited@365trade.net

Forum: Buying and Selling Steel ]]> http://forum.worldsteelprices.com/post?id=5595914 Sat, 26 Nov 2011 12:12:40 GMT http://forum.worldsteelprices.com/post?id=5557641 Would anybody have a resource to gain pricing for for 321 steel? I am looking for at least the last 6 months in EU or past year? any help would be appreciated.

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5557641 Mon, 31 Oct 2011 12:28:51 GMT http://forum.worldsteelprices.com/post?id=5531305 Hello, does anyone have 8640 Nickel-chromium-molybdenum alloy steel bar pricing history per ton, or lb, going back to 2001?  thank you.

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5531305 Tue, 11 Oct 2011 20:22:07 GMT http://forum.worldsteelprices.com/post?id=5459639 ___________________________
stainless Steel Saucepan

Forum: General ]]> http://forum.worldsteelprices.com/post?id=5459639 Wed, 24 Aug 2011 08:39:51 GMT http://forum.worldsteelprices.com/post?id=5365904 Fides (China) Investment & Trading Co., Ltd Supplies Steel Pipe, Steel Plate, Steel Coils, Aluminum Pipe, Aluminum Plate/Coils,

Forum: Buying and Selling Steel ]]> http://forum.worldsteelprices.com/post?id=5365904 Fri, 24 Jun 2011 16:09:52 GMT http://forum.worldsteelprices.com/post?id=5357135 Can anyone, help me to find what is US equivalent for German R St I304 (1304). I'm not sure if it is "I" or "1".

Forum: Questions & Answers ]]> http://forum.worldsteelprices.com/post?id=5357135 Fri, 17 Jun 2011 13:42:13 GMT