Seamless steel tubes have hollow sections and are widely used as pipelines for conveying fluids, such as pipelines for conveying petroleum, natural gas, gas, water and some solid materials.Steel tubes can be divided into round tubes and special-shaped tubes according to the shape of cross-sectional area.Since a circle has the largest area with the same circumference, more fluid can be transported in a circular tube.In addition, when the annular section bears internal or external radial pressure, the force is more uniform, so most steel tubes are round tubes.

However, the circular pipe also has certain limitations, such as under the condition of plane bending, the circular pipe is not as strong as square, rectangular pipe bending strength, some agricultural machinery framework, steel and wood furniture, etc., are commonly used square, rectangular pipe.Other special-shaped steel tubes with different section shapes are required according to different USES.

Seamless steel pipes of different usage:

1.Seamless steel tubes for construction

Standards: GB/T8162, ASTM A501, JIS G344,ASTM A500

Common grades: 10#, 20#, 35#, 45#, 40Mn2, 45Mn2, 27SiMn, 20Cr, 40Cr, 20CrMo, 35CrMo, 38CrMoA1, 50CrV, 30CrMnSi

2.Seamless steel tubes for conveying fluids

Standard: GB/T8163,ASTM A53, ASTM A192, JIS G3452, DIN 1629

Commonly used steel grades: 10#, 20#, Q295, Q345

3.Line pipes and petroleum seamless steel casing & tubing

Standard: API 5CT,API 5L

Common grades: J55,K55,L80, N80,P110,grade B, X42,X46,X52,X56,X60,X65,X70

4.Seamless steel tubes for gas cylinders

Standard:GB 18248,EN 10297,EN 10083,JIS G3429

Commonly used steel grades:34Mn2V, 30CrMo, 35CrMo,37Mn,34CrMo4,30CrMoSiA,38Mn6,30CrMo4,42CrMo4

5.Seamless steel tubes for high pressure boilers

Standard: GB5310,ASTM A106, ASTM A210C, ATSM A213, JIS G3461, JIS G3462, DIN 17175,BS3059: Part 2

Common steel grades: 20G, 20MnG, 25MnG, 15MoG, 20MoG, 12Cr1MoVG, 15CrMoVG, 12Cr2MoG, 12Cr2MoWVTiB, 12Cr3Movsib

6.Seamless steel tubes for low and medium pressure boilers

Standard: GB3087,ASTM A179, ASTM A192

Common brands: 10#, 20 #

7.High pressure seamless steel tubes for fertilizer equipment

Standard: GB6479,ISO 9329-2

Common steel grades: 10#, 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo, 12Cr2Mo

8.Petroleum cracking seamless steel pipe

Standard: GB/T9948, JIS G3441

Common brands: 10#, 20#, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo

9.Seamless steel pipe for car half axle sleeve

Standard: Q/OHAD001 YB/T5035,DIN 1629

Common steel grades: 45Mn2, 45#, 25MnCr

10.Hot rolled seamless steel tubes for hydraulic props

Standard: Q/OHAD010  GB/T17398

Common steel grade: 27SiMn

11.Seamless steel pipe for ship

Standard: GB/T5312,DIN 2391

Commonly used brands: Q320, Q360, Q410, Q460 and Q490

12.Cold drawn precision seamless steel tube

Standard: GB/T3639, GB/T8713

Common steel grades: 10#, 20#, 35#, 45#, 30CrMo

13.Seamless steel pipe for geological drilling

Standard: YB/T5052,YB235

Commonly used steel grades: DZ40, DZ50

Seamless steel tube is a kind of economic section steel, has a very important position in the national economy, widely used in petroleum, chemical industry, boiler, power station, ship, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction and military sectors.IMRI supplies seamless steel pipes of all kinds of usages.Just tell us your requirements and you will get seamless steel pipes which meet your needs from us.