About: Cathy Liu

20Cr2Ni4 alloy carburized steel

20Cr2Ni4 steel is a high strength alloy carburized steel with good comprehensive mechanical properties. Its hardenability, strength and toughness are better than those of 12crni3 steel. The forging temperature is 1200 ℃, the initial forging temperature is 1150 ℃, the final forging temperature is more than 850 ℃, and slow cooling after forging. If the grains of 20Cr2Ni4 steel are coarse after forging, the coarse martensite structure will be obtained after quenching even after normalizing and subsequent carburizing.

20Cr2Ni4 steel mechanical properties:

Tensile strength σ B (MPA): ≥ 1175
Yield strength σ s (MPA): ≥ 850
Reduction of area ψ (%): ≥ 45
Impact toughness value α kV (J / cm2): ≥ 78 (8)

65Mn carbon steel

After heat treatment and cold drawing hardening, the strength of 65Mn steel is relatively high, and it has certain flexibility and plasticity; Under the same surface state and complete quenching, the fatigue limit of 65Mn spring steel  is equivalent to that of multicolor alloy spring. But the hardenability is  poor. Manganese (Mn) improves the hardenability, so the strength, hardness, elasticity and hardenability are higher than that of 65# steel.

65Mn steel properties:

Tensile strength Rb (MPA): 735
Yield strength RS (MPA): 430
Elongation δ 10 (%): 14 ~ 21.5
Reduction of area ψ (%): ≥10
Hot rolling hardness: 240 ~ 270HB
Cold rolling soft hardness: 190 ~ 220HB
Cold rolled hard hardness: 300 ~ 340HB
Heat treatment hardness: 38 ~ 60HRC

Equivalent Of 65Mn alloy Spring Steel:

90MNV8 Cold Work Steel

90MNV8 steel material has high hardness and wear resistance. During quenching, the deformation is small and the hardenability is good. Due to a certain amount of vanadium in the steel, the grain size is refined and the superheat sensitivity of the steel is reduced. At the same time, the carbides are fine and evenly distributed.

90MNV8 equivalent steel grades:

90MNV8 Mechanical Properties:

Tensile strength:650 – 880MPA

Yield strength:350 – 550MPA

Elongation:8 %- 25%

Fatigue:275 – 275MPA

105WCr6 cold work steel

105wcr6 is a kind of cold work tool steel which is widely used. It is known as “constant shape steel”, but it is sensitive to form network carbide.

105WCr6 steel Mechanical properties：

Proof strength (MPa):≥833

Tensile strength(MPa):≥722

Impact energy KV (J): 43

Elongation at fracture A (%): 11

Reduction in cross section on fracture Z (%): 22

DIN 105WCr6  equivalent material:

51CrMoV4 spring steel

51CrMoV4  steel is a kind of spring steel , as spring steel for quenching in oil. The strength and hardenability of 51CrMoV4 steel is strengthened not only by chromium and vanadium – as in the case of 51CrV4 / AISI 6150, but also by molybdenum. Molybdenum strengthens the solution during heat treatment, while chromium and vanadium form carbides that improve the hardness of the material during tempering.

51CrMoV4 equivalent steel grades:

51CrMoV4 properties:

Treated for cold shearability +S: ≤ 280 HB
Soft annealed +A: ≤248 HB
Spheroidized annealed – GKZ (+AC):≤225 HB
Core hardness after quenching: ≥54 HRC

51CrV4 Spring steel

51CrV4 (1.8159) Spring steel has good mechanical and technological properties and high hardenability. Vanadium in the steel can refine the grain size, reduce the overheat sensitivity, improve the strength and toughness. The steel grade has high fatigue strength and high yield ratio, but poor weldability and low cold deformation plasticity.

51CrV4 equivalent steel grades:

51CrV4 mechanical property:
Tensile strength σ B (MPA): ≥ 1274
Yield strength σ s (MPA): ≥ 1127
Elongation δ 5 (%): ≥ 10
Reduction of area ψ (%): ≥ 40
Hardness: ≤ 321HB

40Cr engineering steel

40Cr steel is one of the most widely used steels in mechanical manufacturing industry. After quenching and tempering, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. Except from quenching and tempering, the steel is also suitable for cyaniding and high frequency quenching. When the hardness is 174-229hb, the relative machinability is 60%.

The steel is easy to be processed and certain toughness, plasticity and wear resistance can be obtained after proper heat treatment. Normalizing can promote the microstructure refinement, close to the equilibrium state, and improve the cutting performance of the blank. The steel has the best comprehensive mechanical properties when tempered at 550 ~ 570 ℃. The hardenability of the steel is higher than that of 45 steel, which is suitable for high frequency quenching, flame quenching and other surface hardening treatment.

40Cr equivalent grade:

40Cr Mechanical Properties:

Tempering heating temperature (℃): 520;
Tensile strength (σ B / MPA): ≥ 810 (when the actual hardness is 25hrc)
Yield point (σ s / MPA): ≥ 785
Elongation after fracture (δ 5 /%): ≥ 9
Reduction of area (ψ /%): ≥ 45
Shock absorption energy (aku2 / J): ≥ 47
Brinell hardness (100 / 3000hbw) (annealed or tempered at high temperature): ≤ 207

100Cr6 bearing steel

The comprehensive properties of 100Cr6 bearing steel are good. After quenching and tempering, the hardness is high and uniform, the wear resistance is good, and the contact fatigue strength is high. The steel has good hot workability and good machinability after spheroidizing annealing. 100Cr6 has better toughness, better tempering stability, smaller deformation and better hardenability than chromium steel.

100Cr6 steel equivalent grade:

100Cr6 mechanical properties:

Bulk modulus:140 GPa

Shear modulus:80 GPa

Elastic modulus:190-210 GPa

25Cr2MoV Alloy steel

25Cr2MoV steel has good intergranular corrosion resistance, excellent corrosion resistance and cold working stamping performance. It has strong corrosion resistance to oxidizing acid (such as nitric acid), alkali solution and most organic and inorganic acids.

Due to its proper hardenability, the microstructure of the alloy is homogeneous sorbite, bainite or very fine pearlite after proper metal heat treatment. Therefore, 25Cr2MoV has higher tensile strength and yield ratio, higher toughness and fatigue strength, and lower toughness and brittle transition temperature.
Generally, the steel material can be used in the state of quenching and tempering, and can also be used after normalizing and high temperature tempering.

25Cr2MoV  steel mechanical properties:

Tensile strength σ B (MPA): 1090
Yield strength σ s (MPA): 1042
Elongation δ 5 (%): 18
Reduction of area ψ (%): 63
Impact toughness value α Ku (J / cm2): 213
Hardness: 308HB

100CrMn6 bearing steel

100CrMn6 is a kind of bearing steel, Chromium ball bearing steel.

100CrMn6 steel equivalent grade:

100CrMn6 mechanical properties:

Tensile strength:115-234MPa

Yield Strength:154MPa

Elongation:56δ5≥(%)

36CrNiMo4 alloy structural steel

36CrNiMo4 is an alloy structural steel. As a property of 36CrNiMo4 steel, density is closely related to the composition of 36CrNiMo4 steel.

36CrNiMo4 steel equivalent grade:

36CrNiMo4 mechanical properties:

Tensile strength σ B (MPA): ≥ 980 (100)
Yield strength σ s (MPA): ≥ 835 (85)
Elongation δ 5 (%): ≥ 12
Impact energy Akv (J): ≥ 78
Impact toughness value α kV (J / cm2): ≥ 98 (10)
Hardness: ≤ 269HB

34CrMo4 alloy structural steel

34CrMo4 steel is a kind of alloy structural steel. It has high rupture strength and creep strength at high temperature, good impact toughness at low temperature, good hardenability, no tendency to overheat, small quenching deformation, fair plasticity and medium machinability when cold forming. Poor weldability, preheating before welding, post welding heat treatment and stress relief are generally used after quenching and tempering treatment, and can also be used after high and medium frequency surface quenching or quenching and low and medium temperature tempering.

34CrMo4 steel equivalent grade:

34CrMo4 mechanical properties:

Tensile strength σ B (MPA): ≥ 985 (100)
Yield strength σ s (MPA): ≥ 835 (85)
Elongation δ 5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness value α kV (J / cm2): ≥ 78 (8)
Hardness: ≤ 229HB