8 Seamless Steel Pipe

8 Seamless Steel Pipe

OD 20mm-300mm(1/8”-24”)
Wall Thickness 10mm-100mm
Steel material 20#,16Mn,St37,St52,St44, etc
Standard ASTM A53, ASTM A106,
API 5L, DIN 17175,
GOST8731/8732, G3457/G3452 etc.
Material Q235B, 10#,20#,45#, 16Mn, 15MnV.
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Product Details

Product Details

8 seamless steel pipe Standard: GB/ t3639-2000 GB/ t8713-88Common brands: 10#, 20#, 35#, 45#, 30CrMoSeamless steel pipe for geological drillingStandard: YB/ t5052-93 yb235-70Commonly used brand names: DZ40, DZ50Seamless steel tube for artilleryStandard: YBn1-86Commonly used brands: 40Mn2, D60Seamless steel pipe for jacking rodStandard: Q/OHAD003Common brand: 1CrMoBearing steel tubeStandard: YB/yjz84 Z12-77Commonly used brand name: GCr15Seamless steel tube for ribbed steel joint sleeveQ/OHA01110 #, 20 #

Brief Introduction

8 seamless steel pipe specifications


Random Length: 

3.5m-12m, or fixed length 5.8m or as the customer’s requirement.


ASTM A53, ASTM A106, API 5L, DIN 17175, 

GOST8731/8732, G3457/G3452 etc.

MaterialQ235B, 10#,20#,45#, 16Mn, 15MnV.

A53B, A106B, API5L B, A192, A179C, A213-T12, A213-T22, 

A335-P1, A335-P2, A333

ST37, ST33, ST37-2, ST35.8 ST52 etc.
CertificateAPI certificate and ISO certificate.

Rust remove, black painting, antirust oil, varnish, 3PE,

 hot-dip galvanized etc.


By bundles, plastic caps or steel caps, woven, 

wooden cases or as requirement.

AdvantageBig diameter and thick wall pipes.
Best price with good quality.
The partner you can trust.
Good service and very patient.

8 seamless steel pipe

Hot rolling process

Round tube billet → heating → perforation → three-roll cross rolling, continuous rolling or extrusion → tube off → sizing (or reducing) → cooling → straightening → hydraulic test (or flaw detection) → marking → warehousing of seamless steel pipe is made of steel ingot or solid tube billet through perforation into capillary tube, and then made by hot rolling, cold rolling or cold drawing.

The specification of seamless steel pipe is expressed by outer diameter * wall thickness mm number.

Seamless steel tube hot rolling and cold rolling (dial) seamless steel tube two categories.

Hot-rolled seamless steel tube can be divided into general steel tube, low and medium pressure boiler steel tube, high pressure boiler steel tube, alloy steel tube, stainless steel tube, petroleum cracking tube, geological steel tube and other steel tube.

Cold rolling (dial) seamless steel pipe in addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipes, but also including carbon thin wall steel pipe, alloy thin wall steel pipe, stainless steel pipe, stainless steel pipe, shaped steel pipe.

The outer diameter of hot rolled seamless pipe is generally more than 32mm, wall thickness 2.5-200mm, cold rolled seamless steel pipe diameter can be up to 6mm, wall thickness can be up to 0.25mm, thin wall diameter can be up to 5mm wall thickness is less than 0.25mm, cold rolling than hot rolling dimensional accuracy.

Generally used seamless steel pipe is 10, 20, 30, 35, 45 and other high quality carbon junction steel 16Mn, 5MnV and other low alloy structure steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other combined steel hot rolling or cold rolling made.

10, 20 and other low carbon steel manufacturing seamless tube is mainly used for fluid transport pipeline.

Seamless tubes made of medium carbon steel such as 45 and 40Cr are used to make mechanical parts, such as stressed parts of cars and tractors.

Generally used seamless steel tube to ensure the strength and flattening test.

Hot rolled steel tube in hot rolling state or heat treatment state delivery;

Cold rolling delivery in heat and heat treatment condition.

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