When the pipe is rolled,45# large diameter reel, the distance between the two welds shall be greater than 100mm, and the distance between the outer wall of the outer branch pipe shall not be less than 50mm.
Separate & ldquo; Hot coil & rdquo; The word is a noun, which is the abbreviation of hot rolled coil, and the hot coil used here to connect with thick wall steel pipe is a verb, indicating a kind of behavior.
.For pipe fittings with nominal pressure indicating their grade or specified pressure and temperature rating, for pipe fittings with nominal thickness of straight pipe connected to them, the applicable pressure and temperature rating shall be determined according to the reference pipe grade specified in the standard, For example, for pipe fittings with only overall dimensions specified in gb14383 ~ GB standards, such as GB1245 and GB 1340, confirmatory test shall be conducted to determine their bearing strength.
Finish machining is performed below, and after shot peening, the scales on the inner and outer surfaces of the elbow are removed, and both ends are processed with grooves to facilitate welding.
.Due to the continuous application of thick wall coiled pipe in industry and the continuous expansion of its scope, it has many advantages. In order to prevent the thick wall coiled pipe from rusting, we can apply antirust oil on the surface of the thick wall coiled pipe.
Weld size has a great influence on the quality of rolled steel pipe. Weld size mainly includes welding process parameters, welding wire shape and position parameters, flux flow flux process performance and weld forming.
The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate. Thick wall coil and large diameter coil are mainly made of carbon steel, etc. coil is a kind of welded pipe product with simple and flexible process. If the length required by the customer is special, two or more steel pipes must be connected. Therefore, the process of this welded pipe is flexible, convenient and applicable. The disadvantage is that it can not be produced by mechanized line. The level of automation and mechanization is not high, which requires a lot of manual processing. The main problem of coiled pipes is welding. Thick wall coiled pipes can be delivered as long as they can be inspected by flaw detection. The relevant requirements are broader than other products.
The steel plate coil adopts the secondary forming process. When rolling, first bend both ends of the steel plate, and the diameter shall be less than the diameter of the coiled pipe. Then adjust the bed pressure, rolling two to three times steel pipe coiled pipe welding and strengthening the rolling pipe joint, long-term rolling pipe, Q235B coil pipe, large diameter thin wall tube, large diameter heavy wall coil pipe, stainless steel coil pipe, L360 coil pipe, 16MN coil pipe and other brand products, designated products are complete, quality assurance. Then transported to the welding platform for welding.
Thick wall coil production process thick wall coil production process can be divided into cold drawing, cold rolling, hot rolling and hot expansion.
The influence of welding process parameters mainly includes two aspects: according to the production characteristics of spiral steel pipe, the welding current is usually smaller for internal welding and larger for external welding. However, and the melting amount of welding wire is also the same
Good quality.The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
The effect of antirust oil on thick wall coiled pipe is antirust effect, which can make the thick wall coiled pipe as smooth as new for a long time and reduce the external corrosion to it. It can also increase its sealing performance and ensure that there will be no problems when transporting fluid. In addition,45# thick wall welded pipe, it has moisture-proof performance, uses antirust oil to isolate the direct air of thick wall welded pipe, so it has little chance of being changed by the external situation, which increases its stable performance and safer use.
1 carbon structural steel: q215-a, q215-a. & middot; FQ215-B,Q215-B· F,Q235-A,Q235-A· F,Q235-B,Q235-B· F. Q235-c ordinary carbon steel: B2 BY2 B2F by2f B3 by3 B3F by3f a2ay2 a2f ay2f A3 ay3 A3F ay3f2 high quality carbon steel: 10 15 20 transmission shaft steel 3 low alloy structural steel: 123mn 16Mn 19mn 08ti 10ti15ti4 special purpose steel thick wall coil is made of steel plate. Long term coil, Q235B coil, Q345B coil, large diameter thin wall coil, large diameter thick wall coil stainless steel coil, L360 coil, 16Mn coil,16Mn large diameter thick wall welded pipe, 20 old brands, with price advantages and quality! Thick wall coil can be divided into two types: hot coil and thick wall coil.
Potential development.The effect of antirust oil on thick wall coiled pipe is antirust effect, which can make the thick wall coiled pipe as smooth as new for a long time and reduce the external corrosion to it. It can also increase its sealing performance and ensure that there will be no problems when transporting fluid. In addition, it has moisture-proof performance, uses antirust oil to isolate the direct air of thick wall welded pipe, so it has little chance of being changed by the external situation, which increases its stable performance and safer use.
It is characterized by high precision. However, the grating ruler is expensive and difficult to maintain, which has a great impact on dust and field vibration.
Weight per meter of steel plate coil = (outer diameter wall thickness) * wall thickness * 0.0246615 steel plate coil is made of steel plate. Thick wall t-welded coil can be divided into coil and hot rolled thick wall coil.
.The second stage is called the complex compensation stage, that is, the sector of the coiled pipe will gradually reduce its speed until it reaches the required position, which is the inner circumference position of the steel pipe before complex required by the process design. The second stage is the pressure maintaining and stability stage: the sector block remains stationary at the inner circumference of the steel pipe before re assembly, which is the pressure maintaining and stability stage required by the equipment and expanding process.
Main technical measures for low hardening trend
The process of thick wall straight seam coiled pipe is generally rolled. If the diameter required by the customer is particularly large, it is difficult for general machinery and equipment, so it is necessary to use coiled pipe. First after the steel plate is rolled, then weld the two rolled steel pipes. The weld is also called T-welding. Sometimes, the large diameter thick wall straight seam steel needs to roll and weld the two steel plates, Therefore, there may be two welds on a pipe body, also known as double welds. Thick wall straight seam coiled pipe has a wide range of materials. As long as it is a steel plate that can be ordered in a steel plant, it is basically OK. The main problem of the product is the welding quality. The welding quality directly determines the quality of the product, which is the main step in the thick wall rolling pipe. It is suitable for columns for bearing steel structures such as buildings, bridges dams and offshore platforms, super long-span building structures and electric pole tower and mast structures requiring wind resistance and earthquake resistance.