20CrMo – JIS:G4053:2003 Hot-rolled Carbon Steel Pipe Krobo Steel

Standard JIS, AiSi, ASTM, GB, DIN, EN
Tolerance ±1%
Grade 20CrMo
Outside Diameter 21.3-1420mm
Wall Thickness 2.11-300mm
Surface require Black,grinding,bright,polish
Payments T/T or L/C at sight
Packing seaworthy packing ,wooden case ,
carton,woven bag or at client’s requires

20CrMo hot-rolled steel pipe is a kind of steel pipe product made of alloy material. The main advantages are high hardenability, no temper brittleness, good weldability, little tendency to form cold cracks, good machinability and cold strain plasticity. It is generally used in the quenched and tempered or carburized and quenched state. 20crmo hot rolled steel pipe. The main implementation standards are GB3088-82 (seamless steel pipes for automobile axle shaft casings), GB9948-2006 (seamless steel pipes for petroleum cracking), GB5310-2008 (seamless steel pipes for high-pressure boilers), etc. The high temperature resistance, low temperature resistance and corrosion resistance of 20crmo hot-rolled steel pipe are not comparable to other seamless steel pipes, so alloy pipes are widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries.


Chemical Composition (%)

Steel Grade










0.17 to 0.24

0.17 to 0.37

0.40 to 0.70

≤ 0.030

≤ 0.030

0.80 to 1.10

0.15 to 0.25

≤ 0.30

Heat Treatment Specification

First quenching heating temperature: 880 °C (Quenching agent: water, oil)

Tempering heating temperature: 500 °C (agent – water, oil)


20CrMo is widely used in aerospace, electric power, petrochemical, shipbuilding, machinery, electronics, environmental protection and other industries.

A large number of pipelines are used to transport fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. It is an economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolds used in construction. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing processes, save materials and processing time, such as rolling bearing rings, jack sets, etc., have been widely used in steel pipes.

Classification By Size:

The length is generally 6000mm, 1250mm,2200mm,12000mm, and the thickness is distinguished by cold rolling and hot rolling. Cold rolling mainly has thickness 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm. The main thickness of hot rolling is 3.0mm, 4.0mm, 6.0mm, 8.0mm, 10.0mm, and the width is generally 1000mm, 1219mm, 1500mm.Please contact customer service for general specifications.

Hot-rolled carbon steel pipe are produced by continuous hot-rolled carbon steel technology with hot-rolled steel strip or cold-rolled steel strip as the substrate. The hot-rolled carbon steel sheet is supplied as a rectangular flat plate by cross-cutting; the hot-rolled carbon steel sheet is supplied in coil form by coiling, and the hot-rolled carbon steel sheet coil can be divided into hot-rolled carbon steel sheet coil and cold-rolled carbon steel sheet Coils, they are mainly used in construction, home appliances, automobiles, containers, transportation and household business and other fields. Especially steel structure construction, automobile manufacturing, steel silo manufacturing and other industries.

Their main features are: strong corrosion resistance, good appearance quality, benefit from deep processing, economical and practical, etc.

Application range:

  • After annealing, it is processed into ordinary cold rolling;

(2) The galvanizing unit with pre-annealing treatment device processes galvanizing;

(3) Panels that basically do not need to be processed.



Our Advantages

The hydraulic seamless precision steel pipe produced has high precision, good finish, no oxide layer on the inner and outer wall of the steel pipe, the steel pipe can withstand the high pressure of liquid flow, and the cold bending of the steel pipe is not deformed, can be flamed, squished without cracks. Mechanical properties can be bent at any Angle without deformation.

Chemical Composition (%)
Steel GradeCSiMnPSCrMoCu
20CrMo0.17 to 0.240.17 to 0.370.40 to 0.70≤ 0.030

≤ 0.0300.80 to 1.100.15 to 0.25≤ 0.30