42CrMo4 1.7225 Special Steels

42CrMo4 1.7225 Special Steels Introduction:

42CrMo4 steel is ultra-high strength steel, with high strength and toughness, hardenability is also good, no obvious tempering brittleness, high fatigue limit and resistance to multiple shocks after tempering treatment, low temperature impact toughness is good. The steel is suitable for the manufacture of large and medium-sized plastic molds requiring a certain strength and toughness, and the surface quenching after tempering is usually used as the heat treatment program.

42CrMo4 alloy steel application scope:

42CrMo4 alloy steel has the characteristics of strength, high hardenability, good toughness, small deformation during quenching, high creep strength and lasting strength at high temperature. It is used to manufacture forgings requiring higher strength and larger tempering cross-section than 35CrMo4 steel, such as large gear for locomotive traction, supercharger transmission gear, pressure vessel gear, rear shaft, connecting rod and spring clamp with great load, and can also be used for drilling pipe joints and fishing tools in oil deep Wells below 2000m, and can be used for bending machine molds.

42CrMo4 alloy steel Chemical composition:

Carbon C: 0.38 ~ 0.45%

Manganese Mn: 0.60 ~ 0.90%

Sulfur S: ≤0.030%

P: ≤0.035%

Chromium Cr: 0.90 ~ 1.20%

Silicon Si: ≤0.40%

Molybdenum Mo: 0.15 ~ 0.30%

42CrMo4 alloy steel mechanical properties:

Density ρ (kg/m3) : about 7850

Tensile strength σb(MPa) : ≥1080(110)

Yield strength σs(MPa) : ≥930(95)

Elongation δ5(%) : ≥12

Section shrinkage (%) : ≥45

Impact power Akv(J) : ≥63

Impact toughness value αkv(J/cm2) : ≥78(8)

Hardness: ≤217HBW

42CrMo4 alloy steel Physical properties:

1) Critical point temperature (approximate value) : Ac1=730℃, Ac3=800℃, Ms=310℃.

2) linear expansion coefficient, temperature in the 20 ~ 100 ℃ / 20 ~ 200 ℃ / 300 ℃ / 20 of 20 ~ ~ 20 ~ 400 ℃ / 500 ℃ / 20 ~ 600 ℃, the linear expansion coefficient of: 11.1 x 10 k / 12.1 x 10 k / 12.9 x 10 k / 13.5 * 10 k / 13.9 * 10 k14. 1 x 10 k.

3) Elastic modulus: temperature 20℃/300℃/400℃/500℃/600℃, elastic MPa/MPa/MPa/MPa/oMPa

42CrMo4 alloy steel heat treatment:

Annealing annealingNo. 1 ", 760 plus or minus 10 ℃ annealing furnace cooling to 400 ℃ cold, empty HB220-230

normalizeNo.4860±10℃ normalizing, oven air cooling.

quenching water or oil at quenching+temperingNo.1840±10℃ (depending on the complexity of the product), tempering at 680-700 degrees, HB< 217

quenching quenching+tempering No.2 at 840±10℃, tempering at 470 ℃, HRC41-45

quenching quenching+tempering No.3 at 840±10℃, tempering at 480 ℃, HRC35-45

quenching oil at 850℃ +tempering No.4, tempering at 510 ℃, HRC38-42

quenching oil at 850℃ +tempering No.5, tempering at 500 ℃, HRC40-43

quenching oil at 850℃ +tempering No.6, tempering at 510℃, HRC36-42

quenching oil at 850℃ +tempering No.7, tempering at 560℃, HRC32-36

quenching oil at 860℃ +tempering No.8, tempering at 390 ℃, HRC48-52

42CrMo4 alloy steel heat treatment specification:

Hot working specification

Heating temperature 1150 ~1200℃, starting temperature 1130 ~1180℃, end temperature > 850℃, φ> At 50mm, gently cool.

Normalizing specification

Normalizing temperature 850~900℃, oven air cooling;

High temperature tempering specification

Tempering temperature 680~700℃, oven air cooling;

Tempering specification

Preheating temperature 680~700℃, quenching temperature 840~880℃, oil cooling, tempering temperature 580℃, water cooling or oil cooling, hardness ≤217HBW;

Strengthening and toughening treatment

Quenching temperature 900℃, tempering temperature 560℃, hardness (37±1)HRC;

Induction hardening specification

Quenching temperature 900℃, tempering temperature 150~180℃, hardness 54~60HRC.

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