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Standard: ASTM, DIN, GB Standard2: ASTM A513-2007, DIN 2391, DIN EN 10305, GB/T 3639-2000 Grade Group: 10#-45#, ST35-ST52 Grade: 10#, 20#, 45#, St37, St52, St35.8, St37-2, St35.4, St52.4, ST35, ST37.4 Thickness: 0.5 - 12 mm Section Shape: Round Outer Diameter(Round): 12 - 128 mm Place of Origin: Zhejiang, China (Mainland) Application: Mechanical purpose Technique: Cold Drawn Certification: ISO 9001 TS16949 ISO 14001 Surface Treatment: Black Phosphate Finish Special Pipe: Hydraulic Seamless Tube Alloy Or Not: Non-alloy Secondary Or Not: Non-secondary Length: 1-12m Keywords: hot rolled seamless pipe
Product Details:


 st35.8 seamless   carbon steel 19mm round mild steel tube and pipe price


10#, 20#, A106B, A53B, API 5L, Q345, ST52,S355.etc.




2.5-80mm, SCH10~SCH40~XXL


 5.8m,6m,8m,9m,12m or as customer's required 


Hot Rolled/Cold Rolled

Chemical Composition

C: 0.42~0.50% 

Si: 0.17~0.37% 

Mn: 0.50~0.80% 


Mechanical Properties

Tensile strength  600MPa

Yield strength  355MPa

Elongation  16%

Applied Range

Fluid pipe


plain end or beveled end

black painting on outside

plastic caps on both end

bundle by steel strip




Tianjin or other port

Payment Term


Delivery Time

25days after receiving the deposit

Gb3087-2008 seamless steel tube

Seamless steel tube is made of steel ingot or solid tube blank through perforation into capillary, and then by hot rolling, cold rolling or cold rolling.

GB3087, also called seamless tube for low and medium pressure boiler (gb3087-2008), is used to manufacture various structures of low and medium pressure boiler superheated steam pipe, boiling water pipe and locomotive boiler superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe of high quality carbon structural steel hot rolling and cold drawing (rolling) seamless pipe.Gb3087-2008 seamless steel tubes for low and medium pressure boilers.Specifications of steel tubes for various structural boilers, with an outer diameter of 10~426mm, a total of 43 kinds.There were 29 species with wall thickness ranging from 1.5 mm to 26mm.Gb3087-2008 "seamless steel tubes for low and medium pressure boilers" and gb5310-2008 "seamless steel tubes for high pressure boilers".Appearance quality: no crack, fold, crimp, scar, separate layer and hairline are allowed on the inner and outer surface of steel tube.These defects should be completely eliminated.The clearance depth shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the cleaning place shall not be less than the minimum allowable value of the wall thickness.

According to incomplete statistics, China's existing seamless pipe production enterprises about 240, seamless steel pipe unit about 250 sets, with an annual capacity of about 4.5 million tons.From the caliber, < phi 76, 35%, < phi 159-650, 25%.From the variety, the general purpose tube 1.9 million tons, accounting for 54%;Petroleum pipeline 760,000 tons, accounting for 5.7%;Hydraulic prop, precision pipe 150,000 tons, accounting for 4.3%;Stainless steel pipes, bearing pipes and automobile pipes totaled 50,000 tons, accounting for 1.4%

The raw material for rolling seamless tube is round tube blank, which is cut by cutting machine and sent to furnace for heating by conveyor belt.The billets are sent into a furnace to be heated to a temperature of about 1200 degrees Celsius.Fuel is hydrogen or acetylene.The key problem is the temperature control in the furnace.Generally, the most common puncher is the conical roller puncher, which has high production efficiency, good product quality, large amount of perforation and enlargement, and can be used in many kinds of steel.After perforation, the round billet is rolled, rolled or extruded by three rollers.The tube must be de-sized after extrusion.The sizing machine rotates at high speed through the conical drill bit into the steel billet for drilling, forming a steel tube.The inner diameter of steel pipe is determined by the outer diameter length of the drill bit of the sizing machine.After sizing, the steel pipe enters the cooling tower and is cooled by water spraying. After cooling, the steel pipe is straightened.After straightening, the steel pipe is sent by conveyor belt to metal flaw detector (or hydraulic test) for internal flaw detection.If there are cracks or bubbles in the steel pipe, they will be detected.After the steel tube quality inspection also through the strict manual selection.After the steel pipe quality inspection, spray the serial number, specification and production batch number with paint.And by the crane into the warehouse.

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