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Wldsteel produces welded steel line pipe

4月 27, 2021 /0 コメント/カテゴリ: /作成者:

Wldsteel produces welded steel line pipe, both spiralweld and rolled and welded, in lengths from 30’ to 60’ and wall thicknesses from .250 inches to 2.0 inches. These line pipes, often used to transfer liquid and air, meet the following standards: AWWA C200, ASTM 139, ASTM 134, and ASTM 135. Steel pipe has many advantages to offer, including strength and weight, ease of installation, and cost. Wldsteel is SPFA certified and produces 18” OD to 90” OD hydrotested line pipe using a double submerged arc weld process for a variety of applications, including but not limited to, water transmission pipelines, slurry pipelines, gravity sewer mains, sewer force mains, intake and […]

The commonly used material for condenser tubes

4月 27, 2021 /0 コメント/カテゴリ: /作成者:

The condenser is important auxiliary equipment in the thermal generator set. The condenser is generally composed of neck, casing, water chamber, tube bundle, tube plate, support rod, steam baffle, air cooling area, hot well and other parts, which is the key equipment to determine and affect the load and thermal efficiency of a steam turbine. The heat exchange tube, as the main heat transfer component of the condenser, is the key component of the condenser. With the increase of suspended solids, chloride ions and sulfur ions in the cooling circulating water, there is a higher requirement for a condenser cooling pipe. Condenser heat exchanger pipe should have excellent heat transfer performance, good corrosion resistance, […]

How to prevent Caustic Cracking？

4月 25, 2021 /0 コメント/カテゴリ: /作成者:

In the last article, we introduced what is caustic cracking, the type of caustic cracking and the harm of caustic cracking. Today here we will continue to describe how to prevent caustic cracking corrosion. Choosing the carbon steel material Carbon steel equipment can be used to hold caustic soda at room temperature, considering the terms of strength, plasticity and caustic cracking sensitivity. The 0.20%C killed carbon steel is most suitable for a caustic solution at a maximum temperature of 46℃. However, when the caustic soda temperature exceeds 46℃, post-weld heat treatment is necessary to avoid caustic cracking of high carbon steel weld. The addition of Ti and other alloying elements to carbon steel and heat […]

What’s the Caustic Cracking in the steam pipeline?

4月 19, 2021 /0 コメント/カテゴリ: /作成者:

Caustic Cracking, also known as caustic embrittlement, is the metals cracking in alkaline solutions due to the combined action of tensile stress and corrosive media, is a type of SCC. The cause cracking of pressure boiler mainly occurs in the parts where steam is repeatedly evaporated and condensed or in contact with caustic soda, which may be carbon steel, low alloy steel, ferrite steel and austenitic stainless steel equipment. Cause cracking explosion accidents often occur in boilers system, also caused by Na+ concentration may also occur in autoclaps, waste heat recovery systems and Al2O3 evaporators of electrolytic aluminum enterprises in chlor-alkali chemical plants, paper mills and nuclear power industries. When sodium hydroxide concentration is more than 5%, carbon steel […]

What’s the epoxy coal tar coated steel pipe used for?

4月 12, 2021 /0 コメント/カテゴリ: /作成者:

Epoxy coal tar is a kind of ] corrosion prevention coatings with excellent impact resistance and water resistance, consist by the modified epoxy resin, polyamide resin, coal tar, fillers and additives, offering excellent water resistance, microbial corrosion resistance, good adhesion, toughness, moisture resistant. It can prevent all kinds of ion etching, has been widely used in steel used in underground oil pipeline, water pipe, anticorrosion of sewage pipes, etc. Epoxy coal asphalt anticorrosive layer is divided into general anticorrosive, enhanced anticorrosive (one layer three oil) and special enhanced anticorrosive (two layer four oil). Epoxy coal tar asphalt anticorrosive steel pipe is an anticorrosive form of glass cloth layer and anticorrosive coating. The high quality epoxy coal tar with anticorrosive coating has smooth […]

The design of steel pipe piling

3月 29, 2021 /0 コメント/カテゴリ: /作成者:

Steel pipe pile foundation has the characteristics of quick construction, safety and highly mechanized operation, and is often widely used in large offshore bridges, substructures of ports and wharves, temporary platforms and trestles, etc. Compared with reinforced concrete foundation, steel tube pile foundation has the following advantages: Lightweight, high strength, convenient loading and transportation; High bearing capacity. The steel can be effectively driven into the hard soil and the pile body is not easy to damage and can obtain a great single pile bearing capacity; The length is easy to adjust, can be adjusted by connecting or cutting according to the need. A small amount of soil discharge. The lower end of the […]

The specifications of steel pipe pile

3月 27, 2021 /0 コメント/カテゴリ: /作成者:

In the offshore and inland alluvial plain region, the thickness of 50 ~ 60 m soft soil layer of the upper load is big and can not directly as a bearing layer, the low compression bearing layer is always deep, where usually use the general structure of steel pile with a pile hammer producing a large impact on it. Steel pipe pile reinforcing foundations are suitable than conventional reinforced concrete and prestressed concrete pile at this time. Steel Pipe Pile is generally made of spiral welded steel pipe by plain carbon steel plate. At present, steel pipe piles are mainly used in offshore areas environment were surrounded by deep water and the large impact force of waves, currents and ships. The steel […]

How to improve the strength of steel?

3月 25, 2021 /0 コメント/カテゴリ: /作成者:

The strength of steel refers to the deformation and fracture performance of metal materials under the action of external force, which generally includes tensile strength, bending strength and compressive strength. The more resistant steel is to external forces, the stronger the steel will be. So how can we improve the strength of steel? Solution Strengthening The solid solution of alloying elements in the matrix metal causes certain lattice distortion and increases the strength of the alloy. Lattice distortion increases the resistance of dislocation movement and makes it difficult to slip, thus increasing the strength and hardness of the alloy solid solution. This phenomenon of strengthening a metal by dissolving into a solute element […]

SSC VS HIC Tests

3月 23, 2021 /0 コメント/カテゴリ: /作成者:

Sulfide stress cracking (SSC) is a form of hydrogen embrittlement cracking. Sulfide stress cracking occurs in low alloy steel pipeline, high-strength steels, weld joints, and welding heat-affected zones (HAZs) subjected to tensile stress in acidic environments and temperatures below 82°C (180°F), depending on the composition, microstructure, strength, residual stress, and external stress of the steel. The steel plate samples were immersed in an acidic aqueous solution containing H2S, and the anti-SSCC performance data were obtained by applying an appropriate incremental load. According to the standard NACE TM0177-2016, the specific requirements are as follows: take a group of forged steel plate sample σb or Hb to be the highest, carry out anti-sulfide […]

The welding of API J55 casing

3月 10, 2021 /0 コメント/カテゴリ: /作成者:

API 5A J55 is a commonly used casing material. The tubing body is threaded to the coupling and must be welded to reinforce the strength of the threaded connection. A harsh working environment requires high quality for the pipe body and welding quality. We analyze its weldability by calculating carbon equivalent. The chemical composition of J55 casing is shown in the following table: C Si Mn P S Cr Ni Cu 0.34～0.39 0.20～0.35 1.25～1.50 ≤0.025 ≤0.015 ≤0.15 ≤0.20 ≤0.20 J55 Casing tubing chemical composition CE＝C＋Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 CE＝0.69＞0.4 The weldability of the material is poor when the carbon equivalent exceeds 0.4, high preheating temperature and strict process are needed to obtain qualified welding quality. The carbon content of […]