Welding Round Precision Steel Tubing For Hydraulic Distribution Systems / Circles.

Precision tubes for hydraulic lines

Tube sizes acc. to EN standard, ASTM standard, JIS standard.

Precision tubes are made using the cold drawing process. The rolled seamless tubes are used as the semi-finished product. Precision tubes are made from carbon and alloyed steel. Tubes are destined for hydraulic distribution systems and circles.

Tube dimensions for hydraulic lines,

Inside diameter ranges from 6 to 80 mm and wall thickness ranges from 1.0 to 12.5 mm. Precision steel tubes are delivered according to EN 10305-4, DIN 2391-1. More detailed overview of produced dimensions according to EN standards, according to ASTM standards and according to JIS standards.

The Steel grades for the hydraulic lines

Tubes are produced from the following steel. According to EN 10305-4: E215, E235, E355 and according to DIN 2391-2C: St35 and DIN 1630: St37.4, St44.4, St52.4. Steels are produced in an electric arc furnace and they are fully killed. Upon agreement it is possible to deliver other types of steel.

Allowable pressure for hydraulic lines

The highest allowable pressure for hydraulic lines in relationship to steel and tube testing is calculated according to DIN 2413.

Delivery condition and thermal treatment of the tubes for hydraulic lines

Tubes are delivered as cold drawn and normalized NBK according to DIN, +SR according to EN, . N according to ASTM. Coarseness of the outer and inner surface (starting with 15 mm of the inside diameter) is Ra <= 4 micrometers (0.004mm).

Length of the tubes for hydraulic lines

- manufactured length of the precision tubes is 6 meters (tolerances at the standard length is 0 + 50 mm and at the exact length is 0 + 10 mm)

- exact length is in the range of 3 000 - 9 000 mm.

Tolerances of the tubes for hydraulic and lines

Tolerances of the precision tubes meet the appropriate standards. MEILONG offers precision tubes with tighter tolerances, i.e. tolerances that are tighter compared with the standard values.

Straightness of the tubes for hydraulic lines

3 mm / m (1 : 1 000), overall straightness is 0,0015 % maximum of the total length of a tube.

Ends of the tubes

The ends of the tubes are smooth and enclosed with a plastic plugs.

Marking of the tubes

Each tube is marked by the InkJet system along the whole length according to standards or according to customer requirements. Tube bundles for hydraulic lines are marked by tags.

Surface protection of the tubes for hydraulic lines

The tubes are delivered as oiled, phosphated or electrolytically galvanized and chrome-coated.

Packaging of precision tubes for hydraulic lines

The tubes are delivered in bundles with either circular or hexagonal cross-section weighing maximum 2000 kilograms. The tubes are tied with a steel band. Upon agreement it is possible to protect the surface with paper lining or protect the ends of the bundle with PVC foil.

Testing of the tubes

The electromagnetic nondestructive testing of leak tightness is always performed according to EN 10246-1 or other corresponding standards. Selection of the tests is defined in EN 10305-1. On the top of it the NDT test and the flattening or drift expanding test is possible.

Certificates for the tubes

According to the following standards: EN 10 204 or DIN 50049

Specified testing 3.1.B or 3.1

Upon agreement - 3.1.C or 3.2

Standards and steel grades

Zhangjiagang Bonded Area Yaxin Precision Tube Co., Ltd.

Zhangjiagang Bonded Area Henglong Steel Tube Co., Ltd.

Long-term adherence strict quality control, uphold the "scientific management to create first-class products, promote the comprehensive development of continuous improvement, quality service to win customer satisfaction," the quality and continuously forge ahead, creating enterprise independent quality brand; uphold the integrity of the first with partners closely aligned. We sincerely hope that the friendly cooperation with the community, work together!

Zhangjiagang bonded zone Yaxin precision pipe making Co., Ltd., Zhangjiagang bonded zone Yaxin Auto Parts Technology Co., Ltd.

Zhangjiagang Free Trade Zone Yaxin Precision Steel Pipe Co.,Ltd.and Zhangjiagang Free Trade Zone Yaxin Auto Parts Technology Co.,Ltd.is a Sino-foreign joint venture company,established in 1999,located at Taiwan Road,Free Trade Zone,Zshangjiagang City,jiangsu Province.It is borderend by international mertropolis city-Shanghai to the east,the beautiful ancient city Suzhou to the south ,jiangyin Changjiang River Bridge to the west ,and international port-Zhangjiagang port to the north.The company covers the area of 200000㎡，of which constructiong area is 8500㎡ ,is has 15 million U.S.dollars (about 96 millon RMB)of registered capital,260million RMB of fixed assets,and its annual output is 30,000 tons of precision seamiess steel pipe ,precision welded pipe 50,000 tons.The company currently employs 500 people ,of which more than 60 have higher education ,more than twenty have senior titles or above .Our main products are cold rolled and cold drawn precision seamless steel pipes ,of which more steel pipes for automobile,Precision welded pipe for automobile.
The company has eamed great reputation among many well-known large business customers by our modern hardware facilities,independent designed special mould and unique production process;and by our standardized managenmen and strict management procedures;and by our business philosophy of"Honesty ,cooperation andcommon development".Our products are widely used by Shanghai Huizhong Sachs Shock Absoorber Co.,Sacths Automotive Components Systems (shanghai)Co.,Ltd.,ZF Chassis Technology-rich Mining Austria (Changchun)Co.,Ltd.,dongfeng ZF Shock Absonrher Co.,Ltd,Shanghai Huizhong Automotive Manufactuing Co.,Ltd.,FAW Tokico Shock Absorber Ltd.,Zhuzhou Nanfang Yamaha Shock Absorter Co.,Tenneco(Beijing)Co.,Ltd.
The company passed the ISO9001 quality system certification in 2008 ,obtained Special equipment manufacturing license(TS2710J44-2013)in 2009,Passed PED certified of TUV NORD in 2011,passed ISO14001 and OHSAS18001 management system certification of DNV in 2012,and was rated as a high-tech enterprise in 2013.Under the fierce market competition ,the company closely centers around the quality policy of"creating first-class products by scientific management,promoting overall development by contstant improvement and satisfying to the custorners"tokeep forging ahead ,further perfecing all kinds of equipments to dvelop the high quality brand for the company.
The company sincerely hopes that we can get friendly cooperation with all circles of the community.

Zhangjiagang Bonded Area Henglong Steel Tubes Co., Ltd.

Zhangjiagang Bonded Area Henglong Steel Tubes Co., Ltd. is a Sino-foreign joint ventrue company,estabilshed in 1999,located at Taiwan Road,Free Trade Zone,Zhangjiagang City,Jiangsu Province.It is bordered by internationgal metropolis city-Shanghai to the east,the beautiful ancient city Suzhou to the south ,Jiangyin Changjiang River Bridge to the west ,and internationgal port-Zhangjiagang port to the north .It embraces convenient land and water transportation,hospitable weather,god-blessed land rich in culture and talented people .Thereby the company enjoys a great geographical advantage.The company covers the area of 200000㎡，of which construction area is 8500㎡.It has 15 million U.S.dollars (about 96 million RMB)of registered capital,260million RMBof fixed assets,and its annual output is 145,000 tons of seamlell steel pipes.
The Company specializes in producing various types of steel,such as10、20、20G、35、45、16Mn、ST52、40Cr、37Mn5、D9MnD、40Mn2、15CrMoG、12Cr1MoVG、08Cr2ALMo、12CrMo1、T11、T12、T22、T23、T5、T9、SA179、SA192、SA106B、SA210C.Main prouducts are different types of seamless steel pipes ,for example ,steel pipes for structure,fou transmission fluid,for low and medium pressure boiler,for petrleum cracking ,for high pressure fertilizer equipment ,high pressure boiler.The outer diameter of the pipe is from 6 to 133mm,wall thickness is from 0.5 to 16mm.Our products are widely used in industry of machinery manufacturing ,ship engineering ,petrochemical,and pressrue boiler.
The company has eamed great reputaion among many well-known large business customers by our modern hardware facilities,independent designed sepcial mould and unique production process;and by our standardized management and strict management procedures;and by our business philosophy of"Honesty,cooperation and common development".
The company passed the ISO9001 quality system certification in 2008,obtained Special Equipment Manufacturing License(ts2710j44-2013)in 2009,passed PED certified of TUVNORDin2011,passed ISO14001and OHSAS18001management system certification of DNV ,AND was rated as a high-tech enterprise in2012.Unedr the fierce market competition,the company closely centers around the quality policy of"creating first-class products by scientific management ,promoting overall development by constant improvement and satisfying the customers"to keep forging ahead,fruther perfecting all kinds of equipment to develop the high quality brand for the company.The company sincerely hopes that we can get the friendly cooperation with all circles of the community.