More about seamless pipe sizes

Seamless Piping are popular in everywhere, commercial buildings, industrial plants and even homes. They have a large range of sizes and can be seen to occur in several forms. With such

an extensive range of use for the products, it is quite beneficial to the suppliers as they have a constant demand. When they are used in the different kinds of constructions, it becomes imperative to have the right kind of material used to build them. Instead of that, it is better to use the products from reputed manufacturers. 

Basic information about tubes There are no right and wrong materials for the piping among the commonly used products. The major difference comes from the use they are put into. When the right material is used for a wrong process, it could be a disaster. ASTM A53, A106, A179, A500 and A501 are some of the popular standards which are used in the manufacture of the seamless pipes made from carbon steel. 

The advantages of galvanized pipe fittings

What’s galvanized pipe fitting? Well, generally, it is an iron or steel sheet fittings with a zinc coating to prevent corrosion and rust. When comes to galvanized steel pipes, fittings and other structures, strong and desirable in different situations. We can find a lot of advantages in pipes and fittings. 

Long life is the first advantage for galvanized steel pipe, fittings are known for their long life.

1. High quality, anti-corrosion & rust.

2. Easy inspection is another added advantage of taking the adoption of galvanized and fittings. You can see the production date. The inspection process is extremely simple and straightforward. 

3. Fast assembly is also another added advantage of such pipes and fittings. Good quality steel needs to be treated right. There are various benefits and advantages of Galvanized pipe fittings.

SHINESTAR attended the Canton Fair in 2016

In April, SHINESTAR has attended the Chinese largest Exhibition, the Canton Fair ( also named The China Impor & Export Fair) in April 2016. In this year, SHINESTAR has present the high quality scaffolding products in front of clients all over the world. As the largest scaffolding pipe manufacturer, we have been the most competitive scaffold pipe exporter in China. Our scaffold pipes are manufactured directly from our invested factories in Tianjin. Meanwhile,we are able to process hot dipped galvanizing, anti-oxidant painting for the scaffolding pipe. The coating process present high anti-corrsion resistance which protects the pipes from water. In general, different application requires different types of construction scaffolding. Currently, scaffold pipe is widely used for structure support. The advantages including large carring capacity, easy assembly and disassembly, flexible erection, and it has lower price. 

Quality Problems of LSAW Steel Pipe

In the LSAW steel pipe production process, because the primary process is in a hot state, so the heating operation is resolution product quality is very important process.

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The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to billet heated from room temperature to the processing temperature; the latter is used in the process in the blank reheated to the required processing temperature.

Heating will be wrong in the outer surface of the tube surface may exhibit cracks, folds and migraine pain and other waste reason.

Furnace There are many ways, but the primary use is a ring furnace. This furnace has an annular hearth, it can slowly change the direction of the diameter of the blank along the bottom of the load from the entrance, a reversal can be used at the outlet of the heating and soaking temperature to the rule kind of stove. This operation is the key blank is heated uniformly heated to a temperature suitable for processing. Because a great impact on the quality of the perforation, that is, when the temperature of the process piercing is an important condition affecting the quality, it is generally the temperature of the billet piercing working is to manipulate.

Chinese Welded Pipe Market Sluggish

Welded pipe price are temporarly stable in most Chinese cities, while the market remains sluggish without strong downstream demand.The mainstream price of welded price Q235 φ114*3.75mm ranges from RMB 2,300/t (USD350/t) to RMB 2,550/t (USD 388/t) in major domestic markets for the time being. Insiders predict that CHinese welded pripe market will remain sluggish for some time.

A welded pipe trader in Tianjin relvealed that the price of welded pipe Q235 φ114*3.75mm from Youfa Steel is RMB 2.300/t (USD 350/t), stable compared with that of the previous trading day.

The source told Asian Metal that local market prices have kept stable in recent two days, while they have decreased by RMB100/t(USD 15/t) totally since the beginning of last week , as a result of the weak downstream demand. According to him, his current sales volume is only 100tpd against 150-200tpd in the early of May. He has an inventory of 4,000 for the time being and has no confidence in the welded pipe market outlook.

Another welded pipe trader in Wuhan, Hubei province reported that the price of welded pipe Q235 φ114*3.75mm from Huaqi Steel RMB2,400/t (USD 365/t), similar to that of the previous trading day. 

The source disclosed to Asian Metal that the welded pipe market hasn't shown any improvement since the early of May and the current downstream demand is much weaker than it was during March and April. He reported a sales volume of 3,000t in May, While it was 4,000-5,000t in April. Holding a stockpile of 5,000t, He prefers to hold a cautious attitude towards the forthcoming market.

A welded pipe trader in Foshan, Guangdong province disclosed to Asian Metal that the current price for Q235 φ114*3.75mm from local producers is RMB2,630/ (USD 400/t), stable compared with that of last trading day. 

The source pointed out that most end users are inactive in placing orders now and his current sales volume is only 150-200tpd against 300tpd in April. According to him, though local welded pipe prices are temporarily unchanged, he worries that they are very likely to go down again in the near future considering the insufficient downstream demand. He has a regular inventory of 5,000t and will keep a keen eye on the forthcoming market.

Line Pipe Production Status in China

1. Production Process

Welded line pipe can be distinguished into three production process which are resistance welding, spiral submerged arc welding, longitudinal submerged arc welding. These three types of line pipe are applied in different fields according to the raw materials, molding, aperture size and quality varies. 

2. Straight seam electric resistance welded pipe (ERW Steel Pipe)

ERW steel pipe is a type of welded piep has widest range of applications, most production units (more than 2,000), highest production yield (about 80% of the total capacity of the steel pipe production quantity) and the earliest production line invested in China. In China, the production size of ERW steel pipe ranges from 20mm to 610mm which played a large role in the national economy construction. Since the 1980s, about 30 sets of the ERW steel pipe production units 219mm - 610mm units are imported from oversea advanced technology. After years of production pratice, the technology and equipment level have been achieve a great progress, and the product quality is improving. Because of the less improvement, quick wide range of applications and rapid development, in the future, the development of ERW steel pipe prodcution will  focus on producing low cost and reliable products. 

2. Spiral submerged arc welded pipes (SSAW steel pipe)

SSAW steel pipe requires less investment in equipment, low prices for raw materials to produce large diamter pipe, simple production process, low running costs. In China, the oil and gas transportation spiral welded pie has formed a steel plant-based oil system belongs basic format. Low residual stress and tube end forming machinery and expanding other advanced technology, strict quality control through the spiral welded pipe in the quality can be comparable with the Longitudinal. 

3. Longitudinal submerged arc welded pipe (LSAW steel pipe)

About the LSAW steel pipe production process, in the past we mainly use UOE technology. However, in the recent years progressive, JOCE technology is becoming the new mainstream technology for producing LSAW steel pipe. Compared with other welded pipe production process, the LSAW steel pipe production units require relatively large investment, higher cost of raw materials, more complex process, low productivity and high production cost. Because of the high pressure oil and gas pipeline requires large diameter 1 million tons every year. Regardless of the spiral welded pipe, LSAW steel pipe will complement the spiral welded pipe uncovered specifications. 

Line Pipe

In modern society, line pipe is belong to low or ultra low carbon steel pipe with micro-alloyed. Line pipe is a type of high tech and high value added products which is all applied in the areas of metallurgy technology nearly 20 years of new achievements. The development trend of pipeline project is applying large diameter, high pressure, high cold and corrosive, thick wall line pipe. Therefore, in modern society, line pipe should have a high strength, low bauschinger effect, high toughness and resistance, brittle fracture, low carbon volume and good weldability properties. Meanwhile, line pipe has high resistance to HIC and anti-H2S corrosion features is necessary. The optimized production strategies is to improve the steel cleanliness and organizations uniformity, C≤0.09%, S≤0.005%, P≤0.01%, O≤0.002%, and to take micro-alloying, vacuum degassing + CaSi, the continuous casting process under light pressure, multi-stage thermomechanical rolling and accelerated cooling versatile batch process. Domestic and international pipeline specification does pipelines toughness index of steel, pipe only to specific requirements:

(1) Minimum temperature (-5 ℃) DWTT≥85% SA;

(2) the lowest temperature (-5 ℃) Charpy impact energy ≥145J.

Pipeline Technical conditions commonly used by the American Petroleum Institute standards APISpec5L, but the domestic user's specific projects or specific orders and technical conditions are often much more stringent than the API standard.

Smelting technology with more stringent requirements, technical difficulties focused on:

1) content of impurity elements control;

2) inclusion control;

3) a narrow composition control.