Project Description

DIN41Cr4/1.7035 Steel is one of the most widely used medium carbon quenched and tempered steels in the machinery manufacturing industry as per EN10083 standard.After proper heat treatment, it has good comprehensive mechanical properties, such as good toughness, plasticity and wear resistance, low temperature impact toughness and low notch sensitivity.

The hardenability of 41Cr4 steel is good,which is higher than that of C45 steel.41Cr4 steel is suitable for surface hardening such as high frequency quenching and flame quenching.After quenching and tempering (or normalizing), good machinability can be obtained.It is usually supplied in quenched and tempered condition

41Cr4 -DIN 1.7035 round steel

41Cr4/DIN 1.7035 STEEL SUPPLY FORM & SIZE & TOLERANCE

Hot Forged Round bar:Φ80-Φ1000mm

Hot Rolled  Round bar:Φ16-Φ350mm

Hot Forged Square bar: Max Thickness:500mm

Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

41Cr4/DIN 1.7035 STEEL CHEMICAL COMPOSITION

StandardGradeCSiMnPSCr
EN1008341Cr4/1.70350.38-0.45 ≤ 0.40.6-0.9 ≤ 0.025 ≤ 0.035
0.9-1.2
ASTM A2951400.38-0.43 0.15-0.35 0.7-0.9 ≤ 0.035 ≤ 0.040.7-0.9

41Cr4/DIN 1.7035 STEEL RELATED STANDARD & EQUIVALENT GRADE

CHINA/GB 3077:40Cr

USA/ASTM A29:5140

JAPAN/ JIS G4104:SCr440

UK/BS970:530M40

41Cr4/DIN 1.7035 STEEL FORGING

  • Initial Forging Temperature:1150℃
  • Final Forging Temperature:850℃
  • Forging Ratio:above 4:1
  • Post-Forging Treatment:41Cr4 steel should be slowly cooling in sand.

41Cr4/DIN 1.7035 STEEL HEAT TREATMENT

41Cr4/1.7035 Steel Normalizing & Annealing

41Cr4/1.7035 Annealing41Cr4/1.7035 Normalizing
Temperature,℃825-845850-880
Holding timeDepend on material thicknessDepend on material thickness
CoolingFurnace CoolingAir Cooling
Cooling Speed RateMuch SlowlyQuickly
Grain sizeNormalFine
DeformationLargeLarge
Machinability Good Normal
ProductivityRelatively lowHigh
Surface Hardness,HBW≤250≤207

41Cr4/1.7035 Steel Mechanical Properties in N & A condition

Tensile Strength Yield StrengthElongationReduction of Area Impact Charpy-V Hardness
Normalizing795Mpa470Mpa22.7%59%38229HBW
Annealing570Mpa295Mpa28.6%57%41167HBW
41Cr4 Steel Normalizing Diagram

41Cr4 Steel Normalizing Diagram

41Cr4 Steel Annealing Diagram

41Cr4 Steel Annealing Diagram

41Cr4/1.7035 Steel Quenching & Tempering(Q&T)

Process Details

  • Quenching Temperature:830-860ºC
  • Quenching Medium: Oil
  • TemperingTemperature:400-600ºC
  • Cooling Medium:Air

41Cr4/1.7035 Steel Tempering Temperature Vs Hardness

GradeQuenchingTempering Temperature,ºC
Temperature,ºC Hardness150ºC 200ºC 300ºC 400ºC 500ºC 550ºC 600ºC 650ºC
41Cr4850ºC >555553514334322824

41Cr4/1.7035 Steel Mechanical Property with Quenched and Tempered Condition

Tensile Strength
Mpa
Yield Strength
Mpa
Elongation
%
Reduction of Area
%
Impact Charpy-V
J
≥1000≥800≥9≥45≥60

41Cr4/1.7035 Steel Nitriding

41Cr4 belongs to nitridable steel, and the elements it contains are conducive to nitriding.Higher surface hardness can be obtained after nitriding treatment.The hardness of 41Cr4 steel(Q&T condition) can reach up to 72~78HRA after nitriding treatment, and the hardness of the core reaches 43~55HRC.

41Cr4 steel Nitriding process route:

Forging – Annealing – Roughing – Quenching & Tempering – Finishing – Stress relief – Rough grinding – Nitriding – Fine grinding

Because the nitrided layer is thin and brittle, a high-strength core structure is required, so 41Cr4 steel should be quenched and tempered first to obtain tempered sorbite to improve the mechanical properties of the core and the quality of the nitrided layer.

41Cr4/DIN 1.7035 STEEL APPLICATION

After quenching and tempering, 41Cr4 steel is used to manufacture mechanical parts under medium load and medium speed, such as steering knuckles, rear half shafts of automobiles, and gears, shafts, worms, spline shafts, and top sleeves on machine tools.

  • Quenching  with medium temperature tempering

Manufacture of parts subjected to high load, impact and moderate speed work, such as gears, spindles, oil pump rotors, sliders, collars, etc

  • Quenching  with low temperature tempering

Manufacture of parts with heavy load, low impact and wear resistance, and the solid thickness of the section is less than 25mm, such as worm, spindle, shaft, collar, etc.

  • QT &  High frequency surface hardening

Manufacture of parts with high surface hardness and wear resistance without great impact, such as gears, sleeves, shafts, main shafts, crankshafts, mandrels, pins, connecting rods, screws, nuts, intake valves, etc.

In addition, 41Cr4 steel is suitable for the manufacture of various transmission parts for carbonitriding treatment, such as gears and shafts with large diameters and good low temperature toughness.

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