Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

40cr steel pipe characteristics and the purpose


Size: 1/8 to 48 inches
Standard:GB/T8163, ASTM A53, ASTM A106, JISG3452, JISG3454, DIN1629, API5L
Surface:Oiled or black paint

carbon steel seamless pipe

2 Standard:


ASTM A106/53



3Base Material:

10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42,

St 52, Q 235, Q 195, Q345, 27SiMn


4 Wall Thickness:



5 Out Diameter:




6 Length:

5.8m/6m/11.8m/12m is common length

Can according your requirement

40cr steel pipe

40cr pipe hardness / 40cr pipe chemical composition / 40cr pipe Quenched / characteristics and the purpose
40cr pipeS material the theoretical highest quenching hardness is HRC55 book. Here refers to M is 95% of the hardness. M content different hardness varies greatly. If you simply refers to the hardness of the M (99.9% M) can reach HRC62. Normally workpiece difficult to get how high M content, so you still HRC55 reference value. M hardness and the number of the carbon content, and the amount of the alloy elements of not much relationship.
Seems according to your conditions, the working conditions of the workpiece is not too bad, can consider surface hardening of medium carbon steel pipe quenched and tempered; higher wear resistance requirement with low carbon steel pipe carburizing quenching, the thickness of the diffusion layer generally between 0.5 ~ 2MM (carburizing time related), hardness up to HRC58 to 62; course nitride steel pipe hardness higher than 45 # steel pipe, you can be determined according to the situation
40cr pipe introduced
[References corresponding steel pipe]
China GB standard steel pipe 40cr pipe, the German DIN standards the material No. 1.17035/1.7045, German DIN standard steel pipe 41Cr4/42Gr4, UK EN standard steel pipe No. 18, British BS standard steel pipe No. 41Cr4, France AFNOR standard steel pipe No. 42C4, French NF standard steel pipe 38Cr4/41Cr4, the Italian UNI standard steel pipe No. 41Cr4, Belgium NBN standard steel pipe No. 42Cr4, the Swedish SS standard steel pipe No. 2245, the U.S. AISI / SAE / ASTM standard steel pipe No. 5140, Japan JIS standard steel pipe No. SCr440 (H) / SCr440 The, U.S. AISI / SAE / ASTM standard steel pipe No. 5140, the International Organization for Standardization ISO standard GangHao 41Cr4.
[Critical temperature]
(Approximate) Acm = 780 ° C
【Normalizing specifications]
Temperature of 850 ~ 870 ℃, hardness 179 to 229HBS.
[Cold-pressed blank softening treatment specifications]
Temperature of 740 ~ 760 ℃, holding time 4 ~ 6h, the cooling rate of 5 ~ 10 ℃ / h, cooling to ≤ 600 ℃, cooled baked.
Prior to treatment hardness ≤ 217HBS, to soften hardness ≤ 163HBS.
[Health the iron filings protection swing the tempering specification]
(670 ± 10) ℃ × 2h, with the furnace temperature (710 ± 10) ℃ × 2h, followed by furnace cooling, (670 ± 10) ℃ × 2h, with the furnace temperature (710 ± 10) ℃ × 2h, and then with the furnace cooling, (670 ± 10) ℃ × 2h, with the furnace temperature (710 ± 10) ℃ × 2h, followed by furnace cooling, a total of three cycles, and then cooled to 550 ° C, cooled baked.Treated hardness 153HBS.
【Quenched and specification]
Quenching temperature of 850 ° C ± 10 ° C, oil cooling; tempering temperature of 520 ℃ ± 10 ℃, water, oil cooled.
Chemical composition



















Mechanical Properties
Sample blank size (mm): 25
Heat treatment:
First quenching temperature (° C): 850; coolant: oil
Second quenching temperature (° C): -
Tempering heating temperature (℃): 520; coolant: water, oil
40cr pipe roundwood
Tensile strength (σb / MPa): ≧ 980
Yield point (σs / MPa): ≧ 785
Elongation rate (δ5 /%): ≧ 9
Section shrinkage (ψ /%): ≧ 45
Impact absorbed energy (Aku2 / J): ≧ 47
Brinell hardness (HBS100/3000) (annealing or tempering state): ≦ 207
40cr pipe quenched and tempered hardness40cr pipe hardness after quenching and tempering is probably HRC32-36, that is probably HB330-380.
40cr pipe - 830-860C oil quenching -> 55HRC
150C tempered - 55HRC
200C tempered - 53HRC
300C tempered - 51HRC
400C tempered - 43HRC
500C tempered - 34HRC
550C tempered - 32HRC
600C tempered - 28HRC
650C tempered - 24HRC
Of 40cr pipe characteristics and uses
In carbon the modulation steel pipe, cold heading die steel pipe. The steel pipe affordable, easy processing obtained by appropriate heat treatment after a certain toughness, ductility and wear resistance.Normalizing promote tissue ball, to improve hardness less than 160HBS rough cutting performance.At a temperature of 550 ~ 570 ℃ tempering, the steel pipe has the best mechanical properties. The hardenability of the steel pipe higher than 45 steel pipe, suitable for surface hardening treatment of the high-frequency hardening, flame quenching.
Quenched and tempered after this steel pipe used in the manufacture of mechanical parts withstand medium-load and medium-speed work, such as automotive steering knuckles, rear axle, and on the machine shaft, worm, spline shaft, tailstock etc.; Quenched tempering used in the manufacture of parts to withstand high loads, shock and medium speed work, such as gears, spindle, oil pump rotor, slider, collars; withstand heavy loads after quenching and tempering used in the manufacture of low-impact and has the abrasion resistance, the thickness of the cross section entities in 25mm below the parts, such as the worm and spindle shaft, collar, etc.; for manufacturing a high surface hardness and abrasion resistance after quenching and tempering and the high-frequency surface hardening no great impact on the parts, such as gears, sleeves, shaft, spindle, crank spindle, pins, connecting rods, screws, nuts, intake valve. In addition, this steel pipe is also suitable for producing the carbonitriding process, a variety of transmission parts, such as the relatively large diameter and low temperature toughness, good gear and the shaft.
[Supplier status and hardness]
Annealed hardness ≤ 207HBS.
40cr pipe shaft parts
Shaft parts is one of the frequently encountered in typical machine parts. It is mainly used to support the transmission components, torque transmission and load bearing. The shaft parts is part of the rotating body, its length is greater than the diameter, generally by the outer cylindrical surface of the concentric shaft, conical surface, the inner hole and the thread and the corresponding end surface. Depending on the structural shape, can be divided into the optical axis, stepped shaft, hollow shaft and crank shaft parts.
Axis aspect ratio of less than 5 is referred to as the minor axis, greater than 20 are referred to as the elongate shaft, most of the shaft in between.
Shaft with a bearing support, referred to the bearing with the shaft section journaled. Journal shaft assembly normally require a higher benchmark their accuracy and surface quality, the technical requirements are generally formulated according to the axis of the main function and working conditions, usually the following:
(A) from the dimensional accuracy of the supporting role of the journal in order to determine the position of the axis, usually its high dimensional accuracy requirements (IT5 ~ IT7).Journal of the assembly of transmission parts dimensional accuracy is generally lower requirement (IT6 ~ IT9).
(B) the geometry of the accuracy of the accuracy of the geometry of the shaft parts mainly refers to the journal, outer cone morse taper hole such as roundness, cylindricity, and generally its tolerance should be limited to the dimensional tolerance range. High precision internal and external circular surface, should be marked on the drawing of its allowable deviation.
(C) the mutual position accuracy of the positional accuracy requirements of the shaft parts of the main by the shaft in the machinery in position and function of the decision. Should normally ensure that the assembly Transmission Parts journal bearing journal concentricity requirements, otherwise it will affect transmission parts (gear) transmission accuracy, and generate noise.Ordinary accuracy of the shaft, with the shaft section of the radial direction of the bearing journal beating generally 0.01 ~ 0.03mm, high precision axis (such as the spindle) is usually 0.001 ~ 0.005mm.
(Iv) surface roughness typically cooperates with the transmission member the shaft diameter of the surface roughness of Ra2.5 ~ 0.63μm, surface roughness of cooperating with bearings supporting the shaft diameter for Ra0.63 to 0.16μm.
Rough and materials
(A) shaft parts the rough shaft parts according to the requirements, production type, equipment condition and structure, the selection of bars, forgings rough form. Little difference between the axis for the outer diameter, generally bar; outer diameter difference between the large stepped shaft or shaft, often used in forging, so that both saving materials and reducing the workload of the machining, but also improve the mechanical properties.
Depending on the production scale, rough forging free and die forgings two. Small and medium batch free forging, a large number of mass-produced using forging.
(B) the material of the shaft parts shaft parts requires selection of different materials and different heat treatment specifications (such as quenching and tempering, normalizing, quenching, etc.), in order to obtain a certain strength, toughness, and depending on the working conditions and the use of wear resistance.
40cr pipe shaft parts used materials, it is cheap (or normalizing) after quenching, better cutting performance can be obtained, but also to obtain higher mechanical properties such as strength and toughness, after quenching, surface hardness up to 45 ~ 52HRC.
40cr pipe alloy structural steel pipe suitable for medium accuracy and high speed shaft parts, quenched and the quenching of this type of steel pipe, has good mechanical properties.
GCr15 bearing steel pipe and spring steel pipe 65Mn, after quenched and the high-frequency quenching, surface hardness up to 50 ~ 58HRC, and have higher fatigue resistance and good wear resistance, higher precision of the shaft can be manufactured.
Precision machine tool spindle (eg grinding wheel axis jig borer spindle) optional 38CrMoAIA nitrided steel pipe. This steel pipe after quenching and surface nitriding, can not only obtain a high surface hardness, and can keep a relatively soft core portion, and therefore good resistance to impact toughness. And carburized steel pipe, heat treatment deformation is small, higher hardness characteristics.
The 40cr pipe widely used in machinery manufacturing, and mechanical properties of this steel pipe is good. But this is a medium carbon steel pipe, quenched performance is not good, 40cr pipe hardened to HRC42 to 46. So if necessary, surface hardness, and want to play 40cr pipe superior mechanical properties, 40cr pipe surface carburizing quenching often, so you can get the desired surface hardness.
40cr pipe elastic modulus
40cr pipe modulus of elasticity: elastic modulus E (20 ℃) ​​/ MPa 200000 ~ 211700, shear modulus G (20 ℃) ​​80800
Heat treatment process
Quenching process
40cr pipe quenching 850 ℃, oil cooling; tempering 520 ° C, water, oil. 40cr pipe surface quenching hardness HRC52-60, flame hardening can reach HRC48-55.
Nitriding process
40cr pipe belong to the nitride steel pipe, which contains elements conducive to nitride. 40cr pipe after the nitriding treatment to obtain a higher surface hardness, the hardness of the nitriding treatment in the 40cr pipe quenched after highest attainable HRA72 ~ 78, i.e. HRC43 to 55.
Nitride workpiece process route: forging - annealing - roughing - quenching and tempering - finishing - in addition to stress - kibble - nitride - fine grinding or abrasive. Nitride layer is thin and brittle, thus requiring the heart tissue have a higher intensity, so the first transfer of heat treatment, sorbite to improve the Heart Ministry mechanical performance and the quality of the nitrided layer. The soft nitriding reactive nitrogen used gas nitriding.
Before 40cr pipe welding preheat, to prevent matrix heat, causing the weld internal quench quench cracking. Plus the best in the quenched and tempered after welding again normalizing.
40cr pipe welding:
The crystallization easy segregation, is more sensitive to the crystalline crack (a thermal cracking), welding easy in craters and weld recessed portion cracking. Higher carbon content, rapid cooling is easy to be very sensitive to cold cracking of hardened tissue (martensite).Overheated zone in the cooling rate is larger, it is easy to form hard and brittle carbon martensite so overheated zone embrittlement.
Welding process points:
1, the general state of the annealing (normalizing) to be welded.
2, the welding method unrestricted
3, with a larger line energy, an appropriate increase in the preheat temperature, general preheat temperature and inter-layer temperature can be controlled between 250 ~ 300 ℃.
4, welding materials should ensure that the deposited metal composition substantially identical with the parent material, such as the J107-Cr
5 should timely transfer of heat treatment after welding. If timely quenching and tempering treatment is difficult, can be carried out intermediate annealing or insulation higher than the preheated temperature for a period of time, to exclude the diffusible hydrogen and softened tissue. Products of more complex structure, weld can be finished welding after a certain number of welds, the primary intermediate annealing.
Delivery Status
40cr pipe delivery status to heat treatment (normalizing, annealing or tempering) or without heat treatment delivery, the delivery status should be specified in the contract.
① steel pipe at the beginning of the two numbers indicate the carbon content of the steel pipe, said the average carbon content of the very few, such as 40cr pipe, 25Cr2MoVA alloy pipe ② steel pipe major alloying elements, in addition to individual micro-alloying elements, generally a few percent said. When the average alloy content of <1.5%, steel pipe generally marked element symbols, rather than marked content prone to cause confusion, but in exceptional circumstances, can also be marked with the number "1" in the element symbols, such as steel pipe, No. the the "12CrMoV" and "12Cr1MoV", the former of chromium content of 0.4-0.6%, the latter is 0.9-1.2%, and the remaining components are all the same. When the average content of alloying elements ≥ 1.5% ≥ 2.5% ≥ 3.5% ... behind the element symbols should be marked content, corresponding to 2,3,4 ... and so on. For example, 18Cr2Ni4WA.
③ steel pipe vanadium V, titanium Ti, AL aluminum, boron B, and rare earth RE, alloying elements, are micro-alloying elements, although the content is very low, should remain in the steel pipe marked. E.g. 20MnVB steel pipe. Vanadium 0.07-0.12% and 0.001-0.005% boron.
④ High quality steel pipe in the steel pipe and finally add the "A", to distinguish it from the general high quality steel pipe.


1 40CR Seamless pipe Application

Low and middle pressure fluid transportation pipeline

Casing Tube

Boiler Pipe

Petroleunm and natural gas industry

Chemistry industry

Electric industry


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