Thick-walled stainless steel tube is the most common form of thick-walled tube in the industrial application of a wide range of stainless steel thick wall has a very good pressure, corrosion resistance, so become the most advanced detection of the most fashionable materials. First, the characteristics of stainless steel thick-walled tube: 1, stainless steel thick-walled tube corrosion resistance: corrosion resistance is better than 304 stainless steel, pulp and paper in the production process has good corrosion resistance. And 316L stainless steel is also resistant to marine and erosive industrial atmospheric erosion. 2, the stainless steel thick-walled tube heat resistance: 1600 degrees below the intermittent use and in the 1700 degrees below the continuous use of good oxidation resistance.

With every passing day, the world is getting superior and is seeking for a stronger choice for diversified purposes. Double Submerged Arc Welded steel pipes also known as DSAW pipes work best in this direction. These are the vast valiant pipes which are employed for innumerous purposes and have widespread applications in distinct industries. Double Submerged Arc Welded steel pipes typically come in straight and spiral welded formats and are the perfect option for a variety of applications and a number of tasks. It perfectly protects the steel from infectivity of impurities in the air with its submerged welding process. The construction of these potent pipes involves the performance of both –inside and outside welds. Manufacturing of DSAW Steel Pipes Usually, the DSAW steel pipes are designed in very large diameter and to exact outside or inside dimensions. The manufacture or construction of the Spiral Welded steel pipe is a bit different. It is the outcome of the difference in the manufacturing process that upshots in a Spiral Double Submerged Arc Welded seam the length of the pipe to lengths of 150 feet (approx.). The raw materials needed for the formation of DSAW pipes include strip volume, the welding wire and flux. Manufacturing of DSAW steel pipe engrosses first creation of steel plates into the cylindrical shapes. Post the process –the ends of the rolled platter are formed in order to form the V-shaped grooves on the interior as well as exterior surfaces at the location of the seam. Prior to molding, strip is through flattening, trimming, edge planing, transportation and to the curved side surface cleaning etc. is done. Thereafter, the pipe seam is welded by a solitary pass of an arc welder on both the surfaces –interior and exterior and the welding arc is made to be submerged under flux. Widespread Applications The leading application of the Double Submerged Arc Welded (DSAW) pipes is in the creation of long distance pipelines dedicated for combustible liquids or / and gases, heating system pipelines, general purpose pipelines, instrumental engineering, mechanical engineering and nuclear station pipelines. It’s variety in shapes makes it capable of being used for indifferent purposes. Some of the pre-eminent fields (industries) which use the DSAW steel pipes in huge amounts are: • Oil Industry • Gas Industry • Refrigeration Industry • Refining Industry  • Filtration Industry • Offshore Industry • Petrochemical Industry

Stainless steel solution heat treatment is to heat the stainless steel to high temperature and then quickly cooled, so that the carbon reached the supersaturation state, to improve its plasticity and toughness. Solution heat treatment is the production of stainless steel pipe one of the torch to take a detailed look at today's heat treatment temperature control for the importance of stainless steel pipe production. Solution heat treatment for austenitic stainless steel is the most effective softening process, after solution heat treatment of stainless steel welded pipe can get the best corrosion resistance, low strength and good plasticity, so as to be able to meet the various industrial pipe Claim. Usually austenitic stainless steel solution treatment temperature in the 1050 ~ 1150e, if not reach this temperature, its internal organization is unstable, there will be carbide precipitation, leading to the surface of steel pipe can not reach the bright color, the tube surface will show a black . In addition, the stainless steel pipe heated to 1050 ~ 1150e, then immediately cooled down the pipe, on the one hand to ensure that the austenite in the cooling process is not precipitation, on the other hand out of the furnace pipe (leaving the gas protection atmosphere) The temperature should be reduced to no oxidation temperature. Can be seen that the cooling temperature is very important to strictly control the temperature range. Therefore, in the whole solution heat treatment process, the stainless steel pipe heating and cooling temperature are required to strictly monitor the best in this process will protect the stainless steel pipe, in order to avoid the high temperature state of the pipe water oxidation.

Flexibility is poor Pipeline transport as other modes of transport (such as motor transport) flexible, in addition to the carriage of goods is relatively simple, it can not be easily extended pipeline. To achieve "door-to-door" transport services, the average user, the pipeline transportation is often associated with rail transport or motor transport, water transport with the completion of the whole delivery. Special-type strong The object of transport is restricted, the carriage of goods is relatively simple. Only suitable for transporting such as oil, natural gas, chemicals, coal slurry and other gas and liquid cargo. Franchise strong Pipeline transportation is a special transport, its production and distribution mixed, not provided to other shippers use. Fixed investment In order to carry on the continuous transmission, also needs to establish in each intermediate station the storehouse and the pressure station, promotes the pipeline transportation unimpeded.

Countries and the ISO stainless steel standards are provided for hot-rolled (forged) steel, in addition to heating and pressure processing of steel, the general state of heat treatment delivery (heat treatment requirements specified in the order contract). After heat treatment, according to requirements, to pickling, shot peening or turning peeling surface treatment or surface finishing. For cold-rolled or cold-drawn steel, cold or cold working state, or cold after heat treatment, pickling or shot peening, or heat treatment after smoothing, grinding, polishing, or re-different degrees of hardening processing delivery. ISO and EN, DIN standards, the state of delivery of steel according to the production and processing methods and surface conditions of several different types of combinations, more scientific and reasonable, conducive to standard implementation. With regard to the heat treatment system, in addition to ASTM standards, countries and ISO standards for each grade of steel delivery heat treatment system or the determination of mechanical properties of the sample heat treatment system made specific provisions. Only the ASTM standard, in addition to precipitation hardening steel, the steel standard is generally not for each brand of heat treatment system for specific provisions, only the provisions of heat treatment types (such as annealing, melting or aging), various types of steel heat treatment requirements are All varieties of general technical requirements described in the standard.