CNC Machining 35CrMo Steel Parts
35CrMo Is An Alloy Structural Steel ( Alloy Quenched And Tempered Steel ) Specifications Numbering. This Steel Is Mainly Used To Manufacture Important Parts In Various Machines That Are Subjected To Impact, Bending And High Load.Uniform Digital Code: A 30352 Implementation Standard: GB/T 3077-2015.
Chinese Name: 35CrMo
British Standard: 708A37
German Standard: 1.7220
Law Standard: 35CD4
Italy Standard: 35CrMo4
NBN Standard: 34CrMo4
Sweden Standard: 2234
Japanese Standard: SCM432 / SCRRM3
Weld Ability
Carbon Equivalent Value Recommended By The International Welding Society (IIW)
When Ceq<0.40% , The Hard Tendency Of The Steel Is Not Obvious, The Weld Ability Is Excellent, And It Is Not Necessary To Perform Preheating During Welding, And The Welding Can Be Directly Performed;
When Ceq=0.40~0.60% , The Hard Tendency Of Steel Is Gradually Obvious, And The Weld ability Is Acceptable. When Welding, It Is Necessary To Adopt Proper Preheating Before Welding, Slow Cooling After Welding, And Other Measures To Control The Welding Line Energy;
When Ceq>0.60% , The Hard Tendency Of Steel Is Stronger And The Weld Ability Is Poor. It Belongs To The Steel Which Is Difficult To Weld. When Welding, It Must Adopt Higher Preheating Temperature And Strict Process Measures To Select Suitable Welding Materials.
It Was Calculated That The Carbon Equivalent Value Of The 35CrMo Steel Was Ceq=0.72%.It Can Be Seen That The Weld Ability Of This Material Is Poor, The Hard Tendency Is Strong During Welding, And The Hot Cracking And Cold Cracking Tendency Of The Heat Affected Zone Will Be Large, Especially In The Quenched And Tempered State, The Cold Cracking Tendency Of The Heat Affected Zone Will Be The Performance Is Very Prominent, So The Selection Of Suitable Welding Materials, Reasonable Welding Methods, High Pre-Weld Preheating Temperature, Strict Process Measures And Control Of The Appropriate Inter layer Temperature Conditions, In Order To Achieve Product Welding Purpose.
Strength Characteristics
35CrMo Alloy Structural Steel, Has High Static Strength, Impact Toughness And High Fatigue Limit, High Harden Ability Than 40 Cr, High Creep Strength And Long-Term Strength At High Temperature, Long-Term Working Temperature Up To 500 ° C; Cold The Plasticity Is Moderate During Deformation And The Weld Ability Is Poor.Low Temperature To -110 Degrees Celsius, High Static Strength, Impact Toughness And High Fatigue Strength, Good Harden Ability, No Tendency To Overheat, Small Quenching Deformation, Good Plasticity During Cold Deformation, Medium Cutting Work Ability,
However, There Is a First Type Of Temper Brittleness, Poor Weld Ability, Preheating To 150~400 Degrees Celsius Before Welding, Post-Weld Heat Treatment To Eliminate Stress, Generally Used After Quenching And Tempering Treatment, Or Quenching Or Quenching At High Intermediate Frequency Surface. Use After Low And Medium Temperature Tempering. WuGang Production Executive Standards: GB/T 11251-2009, WuGang Enterprise Standards, Military Standards, Delivery Status: Normalizing Or Normalizing + Tempering, Quenching And Tempering.
Manufacturing Use
Used To Manufacture Important Parts In Various Machines Subjected To Impact, Bending And High Load, Such As Rolling Mill Herringbone Gears, Crankshafts, Hammers, Connecting Rods, Fasteners, Turbine Engine Spindles, Axles, Engine Transmission Parts, Large Motor Shafts, Perforators In Petroleum Machinery, Boiler Bolts With Operating Temperatures Below 400 Degrees Celsius, Nuts Below 510 Degrees Celsius, High Pressure Seamless Thick Walled Tubes In Chemical Machinery (Temperature 450-500 Degrees Celsius, Non-Corrosive Medium) ); Can Also Be Used To Replace 40CrNi For The Manufacture Of High-Load Transmission Shafts, Turbine Engine Rotors, Large-Section Gears, Support Shafts (Less Than 500MM In Diameter), Etc.; Equipment Materials, Pipes, Welding Consumables, Etc.
Used As An Important Structural Component For Working Under High Loads, Such As Transmission Parts For Vehicles And Engines; Turbine Generator rotor, Main Shaft, Heavy-Duty Drive Shaft, Large-Section Parts.
Chemical Composition
Carbon C: 0.32~0.40
Silicon Si: 0.17~0.37
Manganese Mn: 0.40~0.70
Sulfur S: allow residual content ≤0.035
Phosphorus P: allowable residual content ≤0.035
Chromium Cr: 0.80~1.10
Nickel Ni: Allowable residual content ≤0.030
Copper Cu: Allowable residual content ≤ 0.30
Molybdenum Mo: 0.15~0.25
Mechanical Properties
Tensile Strength σb (MPa): ≥ 985 (100)
Yield Strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥12
Area Shrinkage ψ (%): ≥ 45
Impact Work Akv (J): ≥ 63
Impact Toughness Value αkv (J/cm²): ≥78(8)
Hardness: ≤229hb
Sample Size: Sample Blank Size Is 25mm
Heat Treatment Specification And Metallographic Organization
Heat Treatment Specifications: Quenching 850 ° C, Oil Cooling; Tempering 550 ° C, Water-Cooled, Oil-Cooled.
Machining Performance:
Steel Number: 35CrMo
Sample Blank Size / Mm: 25
Heat Treatment|Quenching|Heating Temperature/°c|First Quenching: 850
Heat Treatment|Quenching|Heating Temperature/°c|Second Quenching: —
Heat Treatment|Quenching|Coolant: Oil
Heat Treatment|Tempering|Heating Temperature/°c: 550
Heat Treatment|Tempering|Coolant: Water, Oil
Mechanical Properties|Tensile Strength Σb/Mpa|≥: 980
Mechanical Properties|Yield Point Σs/Mpa|≥: 835
Mechanical Properties|Elongation δ5(%)|≥: 12
Mechanical Properties|Face Shrinkage ψ(%)|≥: 45
Mechanical Properties|Impact Absorption Work Akv/j|≥: 63
Delivery State Hardness Hbs|≥: 229
Delivery Status: Delivered By Heat Treatment (Normalizing, Annealing Or High Temperature Tempering) Or No Heat Treatment, The Delivery Status Should Be Stated In The Contract.
Steel Mill Spot Specification
| Product Name | Specifications / Mm | Material |
| Wire Alloy Steel | Ф5.5-30 | 35CrMo |
| Hot Rolled Round Steel | Ф20-100 | 35CrMo |
| Hot Rolled Round Steel | Ф100-150 | 35CrMo |
| Alloy Steel Hot Rolled Sheet | 5-100 | 35CrMo |
| Hot Rolled Round Steel | Ф200-400 | 35CrMo |
| Alloy Steel Cold Rolled Steel Plate | 0.1-180 | 35CrMo |
Cold Plate: (Length X Width) X Thickness X 0.00785
Hot Plate: (Length X Width) X Thickness X 0.00785
Welded Pipe: (Outer Diameter – Wall Thickness) X Wall Thickness X 0.02466
Flat Steel: (Length X Width) X 0.00785
Yuan Steel: (Diameter X Diameter) X 0.00617
Square Steel: (Length X Width) X 0.00785
Galvanized Pipe: (Outer Diameter – Wall Thickness) X Wall Thickness X 0.02466 X 1.06
Medium Plate: (Length X Width) X Thickness X 0.00785
Galvanized Sheet: (Length X Width) X Thickness X 0.00785 X 1.06
Seamless Tube: (Outer Diameter – Wall Thickness) X Wall Thickness X 0.02466
Open Plate: (Length X Width) X Thickness X 0.00785
Rebar: (Diameter X Diameter) X 0.00617