40cr- JIS:SCr440(H)/SCr440 Carbon Steel Pipe Krobo Steel

Product Introduction 

40cr steel pipe is a round steel with a hollow section and no seams around it. Compared with solid steel such as steel, when the bending and torsional strength is the same, the weight is lighter, and it is an economical section steel.

Medium carbon tempered steel, cold heading die steel. The steel is moderately priced, easy to process, and can obtain certain toughness, plasticity and wear resistance after proper heat treatment. Normalizing can promote the spheroidization of the structure and improve the cutting performance of the hardness less than 160HBS rough. Tempering at a temperature of 550~570°C, the steel has the best comprehensive mechanical properties. The hardenability of this steel is higher than that of 45 steel, and it is suitable for surface hardening such as high frequency quenching and flame quenching.


40Cr Steel Chemical Composition:

Element Composition (%)
Carbon (C) 0.37-0.44
Silicon (Si) 0.17-0.37
Manganese (Mn) 0.50-0.80
Phosphorus (P) ≤0.035
Sulfur (S) ≤0.035
Chromium (Cr) 0.80-1.10
Nickel (Ni) ≤0.30
Copper (Cu) ≤0.30




40cr steel pipe is used to manufacture mechanical parts that withstand medium loads and medium speeds, such as steering knuckles, rear axle shafts of automobiles, gears, shafts, worms, spline shafts, top sleeves, etc. on machine tools; after quenching After quenching and tempering at medium temperature, it is used to manufacture parts that withstand high load, impact and medium speed, such as gears, main shafts, oil pump rotors, sliders, collars, etc.; after quenching and low temperature tempering, it is used to manufacture parts that withstand heavy loads, low Impact and wear-resistant parts with a solid thickness of less than 25mm on the cross-section, such as worms, spindles, shafts, collars, etc.; after quenching and tempering and high-frequency surface quenching, they are used to manufacture parts with high surface hardness and wear resistance. Parts without great impact, such as gears, sleeves, shafts, main shafts, crankshafts, mandrels, pins, connecting rods, screws, nuts, intake valves, etc. In addition, this steel is suitable for the manufacture of various transmission parts that undergo carbonitriding treatment, such as gears and shafts with large diameter and good low temperature toughness.

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:

(1) 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.

Why Choose Us?

*Top 20 companies in steel industry trade volume.

*Customized processing steel one-stop purchase.

*Exports of steel exceeded tens of billions for 5 consecutive years.

**We have a complete set of testing equipment, such as ut & ET, hydraulic testing equipment, spectrometer, scanning electron microscope, etc, and have passed SGS TUV

Our Quality Assurance Policy has established guidelines for providing products and services that exceed customer expectations. certified company.