Category Archives: Case Hardening Steel

20MnCr5 Carburized steel

20MnCr5 steel (DIN 1.7147 material)

5. 20MnCr5 Heat treatment Related

• Annealing of 20MnCr5|1.7147 Carburizing steel

Slowly heated to 790-810 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. Different annealing ways will get different hardness.The 20MnCr5|1.7147 Carburizing steel will get Hardness MAX 248 HB （Brinell hardness）.

• Quenching and temperature of 20MnCr5|1.7147 Carburizing steel

Heated slowly to 788°C, Then put in salt-bath furnace keep 1191 ℃ to 1204 ℃。quenching by oil get 60 to 66 HRc hardness. High temperature tempering: 650-700℃，cool in air, get hardness 22 to 30HRC. Low temperature tempering: 150-200 ℃， Cool  in ari, get 61-66HRC hardness.

• Hot work and cold work of 20MnCr5|1.7147 Carburizing steel

DIN 16MnCr5|1.7131 steel can hot worked at 205 to 538°C, 16MnCr5|1.7131 gearing steel can be cold worked using conventional techniques in the annealed or normalized conditions.

6. Mechanical Properties Of 20MnCr5|1.7147 gearing steel

The mechanical properties of annealed DIN 20MnCr5|1.7131 gearing steel (typical for steel) are outlined in the table below:

 7.Applications of 20MnCr5|1.7147 Carburizing steel

DIN 20MnCr5|1.7147 gearing steel steel is widely used for a variety of applications in the used to the gearings in rotating machinery.

Typical applications such as: valve bodies, pumps and fittings, the high load of wheel, bolts, double-headed bolts, gears, internal combustion engine. Electric locomotives, machine tools, tractors, steel rolling equipment, boring machine, railway vehicle, and mining machinery transmission shaft on the steel ball, roller and shaft sleeve, etc.

1.6523 case hardening steel

1.6523 steel  is a low alloy nickel, chromium, molybdenum case hardening steel,1.6523 alloy steel  has good external and internal strength, so there with high wear-resistant. As a carburized steel, it is usually used to make many medium-strength tools.

1.6523 Steel equivalent standards:

1.6523 steel Mechanical Properties:

1.7131 carburized steel

EN 1.7131 steel (16MnCr5 material) is an European standard carburized steel (case hardening steel) with good hardenability and machinability. For larger cross-section parts, high surface hardness and wear resistance can be obtained after heat treatment, and low-temperature impact toughness is also high.

1.7131 steel – Equivalent Materials:

1.7131 steel Mechanical Properties:

Yield Strength Rp0.2 (MPa):≥461
Tensile Strength Rm (MPa):882
Impact KV/Ku (J):21
Elongation A (%):24
Reduction Z (%):41
Brinell hardness (HBW):413

655M13 case hardening steel

655M13 steel is a nickel-chromium alloy case-hardening steel that is specified for heavy duty highly-stressed applications. And it is  is suitable for deep hardening to develop a tough core.When carburised and hardened core strengths of 850 – 1230 N/mm² are attainable.Chromium increases hardenability whilst the nickel content increases toughness and resistance.

BS 655M13 – Equivalent Materials:

655M13 Mechanical Properties:

Yield Strength:540 Mpa

Tensile Strength:700/770 Mpa

Elongation:25%

Hardness:255 HB Max

655M13 case-hardening steel Application 

General applications include all industry sectors for applications requiring high surface wear resistance, high core
strength & impact properties. Typical uses include Gears, King Pins, Sprockets, Shafts etc

21NiCrMo2 Alloy steel

21NiCrMo2 Alloy steel is a hardenable chromium, molybdenum, nickel low alloy steel more often used for carbonizing to advance a case-hardened phase as case hardening steel. This case-hardening will influence in just right wear traits.

21NiCrMo2 equivalent steel grades:

21NiCrMo2 Mechanical properties:

Tensile R_m (MPa):545 (≥)

Impact KV/Ku (J):42

Elongation A (%):33

Reduction Z (%):33

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)

20CrNi2Mo low-carbon steel

20CrNi2Mo steel is a kind of high-quality low-carbon medium. Due to its low content of alloy elements and good coordination effect of various alloy elements, it is listed as the recommended standard in the world’s major industrial countries.

20CrNi2Mo equivalent grade:

20CrMnMo case hardening steel

20CrMnMo steel is a high strength high grade carburizing steel(case hardening steel), alsp known as 20CrMnMo alloy steel.  Its strength is higher than 15crmnmo, its plasticity and toughness are slightly lower, and its hardenability and mechanical properties are higher than 20CrMnTi steel.(20CrMnMo steel vs 20CrMnTi steel)

After quenching and tempering, it has good comprehensive mechanical properties and low-temperature impact toughness. After carburizing and quenching, it will get high bending strength and wear resistance, but it is easy to produce cracks during grinding. Poor weldability, suitable for resistance welding, it need to be  preheated before welding and tempered after welding. Its machinability and thermal workability are good.

20CrMnMo Mechanical properties

Tensile strength (σ B / MPA): ≥ 1180
Yield strength (σ s / MPA): ≥ 885
Elongation after fracture (δ 5 /%): ≥ 10
Reduction of area (ψ /%): ≥ 45
Shock absorption energy (aku2 / J): ≥ 55
Brinell hardness (hbs100 / 3000) (annealed or tempered at high temperature): ≤ 217

18CrNiMo7-6 carburized steel

18CrNiMo7-6 steel belongs to Case Hardening Steel(carburized steel). It is a grade consisting of the addition of chromium, nickel, molybdenum with a range characteristic for all carburizing grades.18CrNiMo7-6 material can be used for much larger sizes and loads.

18CrNiMo7-6 equivalent materials

18CrNiMo7-6 mechanical properties——Quenched and Tempered at 200°C