Spiral seam submerged arc welded steel pipe for general low-pressure fluid transportation (SY / t- is a submerged arc welded steel pipe for general low-pressure fluid transportation such as water， gas， air and steam， which is made of hot-rolled steel strip coil as pipe blank， often warm spiral forming and double-sided active submerged arc welding or single-sided welding.
1Transformer tube: it is used to make transformer heat dissipation tube and other heat exchangers. It is made of general carbon steel. Flattening， flaring zigzag and hydraulic tests are required. Steel pipes are delivered in fixed length or double length，Products Show and there are certain requirements for the tortuosity of steel pipes.
uBalakoyaAll the cracks occur at -mm away from the edge below the alloy pipe，CorallilloDN25 welded pipe more than one meterStable price and the macroeconomic orientation is vertical to the cold rolling orientation， showing a "high mountain" shape.
The fourth is the welding process method to ensure the strict implementation of the special operation method of galvanized pipe. The welding process includes pre welding groove inspection， control of welding process parameters and operation methods， post welding appearance quality inspection， and post welding nondestructive testing if necessary. Control the welding level and the amount of welding materials at each crossing.
DBinacadiGalvanized pipe cleaning， east-west derusting， pickling and shot blasting
WqPipelines of various specifications and models are complete.
The vertical of the processed reinforcement bar shall be divided into small sections as required.
Spiral seam submerged arc welded steel pipe for general low-pressure fluid transportation (SY / t- is a submerged arc welded steel pipe for general low-pressure fluid transportation such as water， gas， air and steam，Products Show which is made of hot-rolled steel strip coil as pipe blank， often warm spiral forming and double-sided active submerged arc welding or single-sided welding.
oX-ray or ultrasonic testing shall be carried out for repair welding of alloy pipe， dead end welding of strip steel and circumferential seam. For the spiral welding of steel for the transportation of flammable general liquids， yibai%sx ray or ultrasonic testing shall be carried out. For the spiral welding of alloy pipes for the transportation of water， wastewater， gas， X-ray or ultrasonic testing sampling inspection (%) shall be carried out.
ALongitudinal welded pipe has the advantages of simple production process， high production efficiency， low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can produce welded pipe with larger pipe diameter with narrow blank， and welded pipe with different pipe diameter with blank of the same width. However，Products Show compared with the straight seam pipe with the same length， the weld length increases by ~ ，CorallilloDN25 welded pipe more than one meterStable price and the production speed is low. Welded pipes with large or thick diameter are generally made of steel blank directly， while small welded pipes and thin-walled welded pipes only need to be welded directly through steel strip. Then after simple polishing， wire drawing is OK. Welded pipe is welded with strip steel， so it is not as high as seamless pipe in its original position. Welded pipe process: uncoiling of raw materials - leveling - end shearing and welding - looper - forming - Welding - removal of internal and external weld beads - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - Inspection (strict control) - Packaging - delivery.
TInspection standardThe two ends of the steel produced by the seamless pipe manufacturer shall be cut into right angles， and the burrs on the surface shall be removed， which is the raw material used by the seamless pipe manufacturer. The embryo prototube embryo needs to be cut by a cutting machine to form an embryo material with a length of about one meter， which is sent to the furnace for heating through the conveyor belt. The billet is sent to the furnace. After internal heating， the temperature is about degrees，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd and the fuel used is often ethyne. Temperature control in the furnace is a very key factor.
nTSince the s， with the rapid development trend of high-quality hot strip mill production and the development of electric welding and testing technology， the welding quality has been continuously improved， the types， specifications and models of welded steel pipes are increasing， and seamless pipes have been replaced in more and more industries. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the way of welding. Classified by production mode: classified by processing technology - electric arc welded pipe， (high frequency， low frequency) gas welded pipe， furnace welded pipe.
Galvanized pipe: the zinc layer of cold galvanized pipe is an electroplating layer， and the zinc layer is separated from the steel pipe substrate. The zinc layer is very thin. The zinc layer is simply attached to the steel pipe substrate and is easy to fall off. Therefore， its corrosion resistance is poor. In new homes， it is forbidden to use cold galvanized pipes as water supply pipes.
Longitudinal welded pipe has the advantages of simple production and processing technology high production efficiency， low cost and rapid development trend. The compressive strength of spiral welded pipe is generally higher than that of straight welded pipe. Narrow blank can be used to produce welded pipe with large pipe diameter， and blank with the same total width can also be used to produce welded pipe with different pipe diameter. However， compared with the straight seam pipe with the same length， the welding length is increased by ~ ， and the production rate is low.
Honesty is the foundationvFirst， the wall thickness of high-quality and smooth steel is particularly thick. Because the thicker the wall thickness of the product， the higher the economy and practicability. The thinner the wall thickness， the greater the processing cost and opportunity， and the higher the resource cost. Secondly， the process of smooth steel also determines its limitations. Generally， smooth steel has low precision， uneven wall thickness， high length cost pockmarks in the internal appearance， the inspection and shaping need to be processed offline. Therefore， it has its advantages in high pressure， high strength and mechanical structure materials. In the process of use， we will gradually find out. In fact seamless pipe has also entered the market in recent years. With the growth of market demand， the advantages of seamless pipe have also been stimulated. But there are also many fakes and fake products on the market. Be careful when you choose.
DThe alloy tube can be hardened by induction heating， so it has excellent rolling fatigue characteristics and corrosion resistance. Therefore， this kind of steel has been widely used as the material of rolling mill flap ball screw in rolling mill manufacturers. In addition to the excellent properties of cronidur steel， the modified LNs steel of case hardening steel also has the surface compressive stress characteristics obtained by heat treatment， and its application range is expected to be further expanded.
Steel mesh guardrail (steel mesh fence) steel mesh guardrail refers to the guardrail made of steel mesh. It is stronger and more durable than the guardrail made of electric welding mesh， steel mesh， hook mesh etc.， but its cost is much higher， and it is rarely used under normal circumstances
gBalakoyaThe production methods of seamless pipe are roughly divided into cross rolling method and extrusion method. The cross rolling method is to drill the tube with a cross roll， and then extend it to the rolling mill. This method has fast production speed， but has high requirements for the workability of the blank. It is mainly suitable for the production of carbon steel and low alloy steel pipes. The extrusion law is to pierce the blank or ingot with a punch， and then squeeze it with a steel pipe with an extruder. The efficiency of this method is lower than that of cross rolling method. It is suitable for producing high-strength alloy steel pipe. The billet or ingot must be heated before cross rolling method and extrusion method. The produced steel pipe is called thermal correlation. Steel pipes produced by hot working can sometimes be cold worked as needed. There are two methods of cold working. One is cold drawing. In other words， pull the pipe to the pipe and tilt it to make the steel pipe gradually thinner and longer. Another method is cold rolling. The method of applying the hot smoke invented by brother to cold processing. The cold working of seamless pipe can improve the dimensional accuracy and finishing of steel pipe， and improve the mechanical properties of materials.
zGGalvanized pipes shall be stored in dustproofto keep clean and new . As a professional manufacturer of galvanized pipe， we have produced galvanized pipe products for many years. Welcome friends who need to buy.
It has a thick and dense pure zinc layer covered on the steel surface， which can prevent the steel substrate from touching with any corrosion solution and maintain the steel substrate from corrosion. In general atmosphere， the surface of zinc layer forms a thin and dense zinc oxide layer， which is difficult to dissolve in water， so it plays a certain maintenance effect on steel matrix. If zinc oxide and other components in the atmosphere form insoluble zinc salts