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Tianjin Yuantai Derun Pipe Manufacturing Group Co., Ltd., established in March 2002, is the biggest manufacturer specializing in  ERW square&rectangular tube/pipe, hollow section structure pipe, galvanized pipe and spiral welding pipe in China. Annual output reaches 5 million tons.Yuantai Derun has 59 production lines of black ERW pipe, 10 production lines of galvanized pipe and 3 production lines of spiral welding pipe. Square pipe from 20*20*1mm to 500*500*40mm, rectangular pipe from 20*30*1.2mm to 400*600*40mm,  welded pipe from 2”—60” can be manufactured. Yuantai Derun can manufacture square rectangular pipes as per the standards of ASTM A500, JIS G3466, EN10219, DIN2240, BS1387, AS1163.

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January 1993

Key team members of Yuantai Derun group began technical job in Tianjin Daqiuzhuang tube factory.

June 2002

Tianjin Yuantai Industry & Trade Co., Ltd. was founded, specialize in square, rectangular hollow steel pipe, hot galvanized welded (hot dip galvanized) square tube, the registered capital is USD 10 million.

May 2004

One of Yuantai subsidiaries Tangshan Lituo Steel Tube Co., Ltd. was established, specialize in square rectangular straight welded hollow steel pipe， registered capital is USD 10 million.

April 2005

Yuantai Steel Square Pipe Co. Ltd. was established, specialize in square welding hollow steel tube and galvanized tube, the registered is USD 2 million.

March 2010

Tianjin Yuantai Runxiang commercial trade company was established, specialize in strip steel trade, galvanized pipe agent, etc., the registered capital is USD 2 million.

March 2010

Tianjin Yuantai Derun pipe manufacturing group Co. Ltd. was formally established, marking that the production of high-frequency welded black, galvanized square pipe, spiral welded pipe, pipe logistics and pipe trade as one of the large-scale joint enterprise Yuantai Derun group was formally established, the group registered capital is USD 20 million.

March 2010

Tianjin Yuantai Derun Investment Co., Ltd. was formally established, specialize in steel pipe industry chain,lower industry mergers and acquisitions and industrial real estate development, the registered capital is USD 2 million.

August 2013

Tianjin Derun Runfeng pipe manufacturing Co. Ltd was established, specialize in hot galvanized (hot galvanizing) processing business, the registered capital is USD 8 million.

March 2015

Tianjin Yuantai Yuanda anti-corrosion insulation pipe Co., Ltd. was established, specialize in spiral welded pipe production and sales, the registered capital is USD 2 million.

August 2015

Tangshan Yuantai Derun Pipe Co., Ltd. was established, specialize in steel strip, steel pipe trade, registered capital is USD 1 million.

March 2016

Tianjin Yuantai Derun International Trade Co., Ltd was established,mainly engaged in international import and export business for Yuantai Group, registered capital is USD 2 million.

Circular Hollow Section

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Circular Hollow Section

DescriptionStandards: BS, GB, BS EN 10297, BS EN10025, BS EN10217, BS EN10219, BS EN10296, GB/T 13793-1992, GB/T 14291-2006Grade: Q195-Q345, Q195, Q215, Q235Thickness: 0.8 - 18mm (SCH30, SCH40, STD, XS, SCH80, SCH160, XXS)Section shape: roundOuter diameter:1/2-18” (20-457mm)Application: structure pipeTechnique: ERWAlloy or not: non-alloyEnds: plain ends/threading ends/bevelledPacking: bundles/PVC cover bundleUsages: conveying gas, structural steel pipes purpose

Circular Hollow Section2

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Circular Hollow Section2

Name: Rectangular hollow sectionsStandard: ASTM A500, JIS G3466, EN10219, DIN2240, BS1387, AS1163.Main steel tube grade: A.B.C, Q195, Q215, Q235, Q355Specification: 20*30*1.2mm to 400*600*40mm

High quality cheap price Hot Rolled coil

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High quality cheap price Hot Rolled coil

We have stocks of various grades of carbon steel coil and support third-party inspections. China-leading supplier of carbon steel coil, factory wholesale price is low.

C Channel Solar Panel Roof Mounting Brackets-Steel Price

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C Channel Solar Panel Roof Mounting Brackets-Steel Price

C channel steel ground solar panel mounting brackets with 20 years waranty, suitable for diferent terrains. Solar panelorientation can be both portrait and landscape. Less components, strong and easy to be instal.

Steel Seamless Pipe Wholesale

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Steel Seamless Pipe Wholesale

1.Craftsmanship ExcellenceOur steel seamless pipes are crafted with meticulous attention to detail, ensuring each product meets the highest quality standards. Utilizing the latest in manufacturing technology, we employ a precise extrusion process that eliminates the need for welding, resulting in a

hot rolled coil price China

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hot rolled coil price China

What is hot rolling? What is cold rolling?1. Hot rollingUse continuous casting or initial rolling slab as raw material, heat it in a step-type heating furnace, remove phosphorus with high-pressure water, and then enter the rough rolling mill. The rough rolling material is cut and then enters the fin

Industrial square steel pipe supplier

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Industrial square steel pipe supplier

Yuantai Derun Steel Pipe Manufacturing GroupProduct Specifications:Outer diameter: 1010-12001200mm, customization is acceptable.Wall thickness: 0.5-60mm, customization is acceptable.Length: 0.5-26.5M, can be cut according to demand.Tolerance: ±5% or as required.Minimum Order Quantity (MOQ): 2-5 ton

Square tubing supplier manufacturer

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Square tubing supplier manufacturer

How to make square tubing？The production process of square tubes and square tubes includes preparation, cutting and adjustment, bending and forming, welding and connection, surface treatment, and quality inspection. Each stage requires professional equipment and tools, and control parameters to ens

C purlin Malaysia Aisan

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C purlin Malaysia Aisan

C purlin Malaysia Aisan:C purlin Malaysia Aisan is automatically processed and formed by C-shaped steel forming machines. C-shaped steel forming machines can automatically complete the forming process of C-shaped steel according to the given C-shaped steel size.What are the types of C-shaped s

ERW welded carbon steel pipe United Arab Emirates

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ERW welded carbon steel pipe United Arab Emirates

What isERW pipe? Can you distinguish between seamless pipe and welded pipe?1. Distinguish from the appearance:(1) First check whether there are welds and bulges on the inner and outer surfaces.If it is a steel pipe without surface coating, first check the inner and outer surfaces of the steel

Wholesale GI Pipe

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Wholesale GI Pipe

Product Specification：SpecificationOuter Diameter13-266.6mmThickness0.5-2.5mmLength1-12mTechniqueGi pipe pre-galvanized pipeor hot dipped galvanizedSteel gradesQ195, Q235, Q355ApplicationUsed For Structure, Accessorize And ConstructionPackagein the bundle, or wrapped with waterproof cloth as

EN10219 S355J2H LSAW Pipe supplier Asian

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EN10219 S355J2H LSAW Pipe supplier Asian

Product details:Product nameEN10219 S355J2H LSAW Pipe Supplier AsianMaterialQ195-A~Q275-A Q195B~Q275B 10# ~75# 16Mn, 5MnV, 09MnV 40Cr,30CrMnSi,45Mn2,40MnB, ASTM A53 A36, A106,API 5L A106 Gr.B etcSurfaceCoated/galvanized/blackTechniqueHot rolled/cold rolled /cold drawn /seamless/erwDimensionOuter Dia

Z purlin Z section

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Z purlin Z section

Product Specification:Size40-500mmWall thickness1.5-4mmHeight20-300mmTechniqueHot Rolled SteelSurfaceGalvanized & Black or as your requestTreatmentpolish;painted;galvanized;punchedMaterial GradeJIS, ASTM, GB, EN, etc.Packagein bundleDelivery Time20-25 days for productionLoading PortXingang

hot rolled coil Malaysia

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hot rolled coil Malaysia

Product Details:Product nameHot rolled coilColorCustomizationStandardASTM,AISI,JIS,GB, DIN,ENTechniqueHot RolledTolerance±1% or as requiredThickness0.8-25.4mmWidth100mm-4200mmLength200mm-18000mm or as the customer's requirementPlace of OriginChinaMOQ2-5 TonsProcessing ServiceBending, Welding, D

spiral pile

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spiral pile

The spiral pile is made of high-strength steel, and its surface is usually hot-dip galvanized. When used as a foundation, its corrosion resistance and service life are effectively enhanced, and it gradually replaces the traditional concrete foundation in construction projects.When used as a building

Steel Window Profiles

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Steel Window Profiles

Requirements for glass curtain wall materials and equipment:1. General regulations:a. Materials for glass curtain walls should comply with the relevant provisions and design requirements of current national standards. Materials that do not yet have corresponding standards should comply with design r

ERW pipe supplier Asian

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ERW pipe supplier Asian

Product Details:Place of Origin Tianjin, ChinaAlloy Or Not Non-AlloyStandard JISTechnique ERWGrade ASTM A106/A53 Gr.BDelivery Time 7-30daysApplication Fluid Pipe, Gas Pipe, OIL PIPE, Structure PipeSpecial Pipe Thick Wall PipeThickness 0.6 - 6 mmLength 6m, 6.4MCertificate JIS, ISO9001, etc.Processing

LSAW steel pipe supplier

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LSAW steel pipe supplier

Product details:Product nameLSAW welded steel pipeMaterialQ195-A~Q275-A Q195B~Q275B 10# ~75# 16Mn,5MnV,09MnV 40Cr,30CrMnSi,45Mn2,40MnB, ASTM A53 A36, A106,API 5L A106 Gr.B etcSurfaceCoated/galvanized/blackTechniqueHot rolled/cold rolled /cold drawn /seamless/erwDimensionOuter Diameter: 5mm-630mm&nbs

galvanized steel coil

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galvanized steel coil

Product Details:StandardAISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc.MaterialSGCC/ CGCC/ DX51D+Z, etc.Thickness(mm)0.12-4.0mmWidth(mm)30mm-1500mmToleranceThickness: ±0.01 mmWidth: ±2 mmCoil internal diameter508-610mm or as per your requestZinc Coating30g - 275g / m2SpangleBig spangle, Regular spang

Square tube project

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Square tube project

Product Details:Size20*20-500*500mm or as the requirement, large size steel tube above 500*500 can be produced.Thickness1.3-40mm or as the requirementLength5.8m/6m/12m or as the requirementSteel gradesASTM A500, ASTM A501, BS 1387, EN10219, EN10210, ASTM A53, JIS G3466,GB/T9711, GB/T3094, GB/T

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¿Cuáles son los defectos propensos a ocurrir en el proceso de soldadura de la tubería de acero soldada en espiral?-Noticias-Tianjin yuantai Derun Tubo de Acero manufacturing group co., Ltd-
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¿Cuáles son los defectos propensos a ocurrir en el proceso de soldadura de la tubería de acero soldada en espiral?
¿Cuáles son los defectos propensos a ocurrir en el proceso de soldadura de la tubería de acero soldada en espiral?

1. Participación de la escoria de soldadura: La escoria de soldadura es una parte de la escoria de soldadura que queda en el metal de soldadura.


2. Mala penetración


La superposición de metal de las soldaduras interior y exterior no es suficiente y, a veces, no hay penetración. Esta situación se denomina penetración insuficiente.


3. Socavado


La socavación es una ranura en forma de V en el borde de la soldadura a lo largo de la línea central de la soldadura. El socavado se produce cuando la velocidad de soldadura, la corriente, el voltaje y otras condiciones no son las adecuadas. Entre ellos, la velocidad de soldadura es demasiado alta para ser más adecuada que la corriente. Es más probable que cause defectos de socavado en la tubería de acero soldada en espiral.




spiral welded steel pipe7.jpg




4. Burbujas


La mayoría de las burbujas ocurren en el centro del cordón de soldadura. La razón principal es que el hidrógeno todavía está oculto en el metal soldado en forma de burbujas. La medida para eliminar este defecto es primero eliminar el óxido, el aceite, la humedad y la humedad del alambre de soldadura y la soldadura, en segundo lugar, se debe secar bien el fundente para eliminar la humedad.


5. Agrietamiento de azufre


El agrietamiento de azufre es una grieta causada por azufre. Cuando se suelda una placa con una fuerte zona de segregación de azufre, el sulfuro en la zona de segregación de azufre ingresa al metal de soldadura. La razón es que la zona de segregación de azufre contiene sulfuro de hierro y acero con un punto de fusión bajo. hay hidrógeno gaseoso.


6. Grieta caliente


En la soldadura por arco sumergido de tubería de acero soldada en espiral, se pueden generar grietas térmicas en el cordón de soldadura. Para eliminar tales grietas, las placas de respaldo generalmente se instalan en los lugares de inicio y extinción del arco, y cuando se completa la soldadura a tope de la bobina, la tubería de acero soldada en espiral se puede invertir y soldar en la soldadura por puntos.


Tianjin yuantai Derun Tubo de Acero manufacturing group co., Ltd

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