Application

Used for construction of long distance pipelines for combustible liquids and gases, nuclear station pipelines, heating system pipelines, general-purpose pipelines, vessels manufacturing, mechanical engineering and instrumental engineering.

DISTINCTIVES FEATURES

Line pipes are manufactured of metal in-house produced and smelted in the electric furnace, treated with synthetic slags and cast by continuous casters. The applied steel making process ensures the achievement of chemically pure steel with reference to sulphur and phosphor contents providing high tensile, ductility and corrosion resistance properties of pipes to be operated at low temperatures in various corrosion media.

Rolling using a press piercing mill and continuous mill equipped with a fixed mandrel allows strict measurement tolerances to be obtained and ensures a lack of pipe body and surface defects.

In order to achieve high tensile and ductility steel as well as its required structure, providing a high corrosion resistance in various corrosion media, pipes are heat treated in a computerized walking beam furnace. 70% of oil line pipes are subject to heat treatment.

Pipes are inspected for internal and external flows by automatic non-distructive testing of ultrasonic and electromagnetic inspection. Pipe ends inspection after beveling is done by magnetic-fluoroscopic flaw detection.

While manufacturing seamless line pipes ensures testing of corrosion-resistance properties through hydrogen included cracking method under NACE MR 02-84 and sulphide stress corrosion cracking method under NACE MR 01-77.

All hot-finishing processes are done and completed above a temperature of 860ºC. The hardness of the material is in all instances below 22HRc, thus complying with the NACE MR 01-75 requirement for carbon steels.

Process

HOT ROLLED

COLD DRAWN

Quality Standard

GB/T 8163 Seamless steel tubes for liquid service

ASTM A106  Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

DIN 1629  SEAMLESS CIRCULAR TUBES OF NON ALLOY STEELS WITH SPECIAL QUALITY REQUIREMENTS

API 5L Line Pipe

Coating Standard

ANSI/AWWA C104/A21.4 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water

ISO 21809 Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems

DIN 30670 Polyethylen coatings of steel pipes and fittings

Steel Grade

GB/T 8163 10# 20# 35# 45# 16MN(Q345B)

GB 3087 10# 20# 35# 45# 16MN(Q345B)

GB 5310 20G 12Cr1MoV 12Cr1MoVG 12CrMoG

ASTM A106 Gr A Gr B Gr C

DIN 1629  St 37.0 St 44.0 St 52.0

API 5L A B X42X46 X52 X60 X65 X70 X80

Size

Outer Diameter Hot finish 2" - 30"  Cold drawn 0.875" - 18"

Wall Thickness Hot finish 0.250" - 4.00"  Cold drawn 0.035" - 0.875"

Length Random Length Fixed Length SRL DRL

End

square ends (straight cut saw cut and torch cut);

beveled for welding (All line piping is square cut to the tolerance specified and bevelled to ANSI B16.25. An angle of 30º (-0º +5º) and a landing of 16 mm ±08 mm is applied. Schedule 160 material is supplied without bevelling.)

Surface Lightly oiled Hot dip galvanized Electro galvanized Black Bare Varnish coating/Anti rust oil Protective Coatings (Coal Tar Epoxy  Fusion Bond Epoxy 3-layers PE)

Test Chemical Component Analysis Mechanical Properties (Ultimate tensile strength Yield

strength Elongation) Technical Properties (Flattening Test Bending Test Hardness Test Blow Test Impact Test etc.) Exterior Size Inspection Hydrostatic Test(The standard pressure is limited to 207 MPa (3000 psi)) X-ray Test.

Mill Test Certificate EN 10204/3.1B

Third party inspection SGS BV Lloyds etc.

<p>We, Shanghai Unite Steel Trading Co., Ltd, are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in china, such as: DAYE Special Steel-a famous steel enterprise with the longest history; BAO Steel- the biggest one; Northeast Special Steel Group-the biggest special steel manufacture; TPCO- largest seamless steel tube production enterprise; and some large powerful welded pipe producer: Tianjin United Steel Pipe Co., Ltd. Guangzhou JuYi Steel Pipe Co., Ltd. Tianjin Zhongshun Petroleum Steel Pipe Co., Ltd. Shengli Oilfield Longxi Petroleum Steel Tube Co., Ltd. Etc. What's more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. Our company is specialized in Special steel bars and Steel tube products. They are classified as following: Special steel bars: carbon steel, alloy steel, mould steel, tool steel, gear steel, bearing steel, spring steel, high temperature steel, and stainless steel, etc. Steel tube products: general structure pipe, fluid pipe, mechanical processing pipe, oil tubing, casing pipe, line pipe and high pressure boiler tube, stainless steel pipe etc. We can supply steel products in China's National Standard, European Standard, American Standard and other national standard, etc. Please speak out your needs to us, and we will do our best and offer you our best reply! Let's expect China's steel product would ensure you to your good business development!</p>