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How to select 50Mn based on load requirements
When choosing 50Mn steel based on load requirements, it is necessary to comprehensively consider the load type, part structure and process compatibility. The following is a systematic selection guide:
I. Load characteristics and material matching logic
Load type adapted process performance focus typical application examples
High static load quenching + medium-temperature tempering (600℃) tensile strength ≥645MPa machine tool support shafts, heavy equipment bases
Dynamic alternating load high-frequency quenching + low-temperature tempering (150-200℃) surface hardness HRC50-55 crankshaft, gear meshing surface
Impact wear load deep quenching + tempering impact toughness ≥39J/cm² crusher tooth plate, track connection parts
️ II. Key selection control elements
Section size limitation
For sections ≤80mm : 50Mn is preferred as the hardened layer is uniform after high-frequency quenching.
Section >80mm : Alloy steel such as 50Mn2 should be used instead to avoid insufficient hardness in the core.
Wear resistance requirements classification
Moderate wear : normalized hardness ≤217HB, suitable for low-speed transmission gears;
Severe wear : The depth of the hardened layer should be ≥3mm, and the surface hardness should be above HRC52 (such as friction discs of mining machinery).
Welding and machining constraints
Welding scenario : preheating at 200-300℃ + low-hydrogen electrode is necessary to avoid cold cracking;
Precision machining : hard alloy tools are required for annealed state cutting, and cold deformation needs to be controlled to prevent cracking.
III. Failure avoidance strategy
Overload risk : dynamic load parts must ensure a yield strength of ≥390MPa; otherwise, upgrade to 55Mn.
Fatigue failure : For components under alternating stress, there should be no decarburization layer on the surface, and 100% magnetic particle inspection should be conducted after quenching.
Brittle fracture : tempering is strictly prohibited in the range of 250-400℃ to prevent tempering brittleness.
Selection decision tree :
Load properties → Cross-sectional dimensions → surface hardness/core toughness requirements → process feasibility
Following this logical chain can maximize the balanced advantages of high strength and wear resistance of 50Mn.
How to select 50Mn based on load requirements
When choosing 50Mn steel based on load requirements, it is necessary to comprehensively consider the load type, part structure and process compatibility. The following is a systematic selection guide:
I. Load characteristics and material matching logic
Load type adapted process performance focus typical application examples
High static load quenching + medium-temperature tempering (600℃) tensile strength ≥645MPa machine tool support shafts, heavy equipment bases
Dynamic alternating load high-frequency quenching + low-temperature tempering (150-200℃) surface hardness HRC50-55 crankshaft, gear meshing surface
Impact wear load deep quenching + tempering impact toughness ≥39J/cm² crusher tooth plate, track connection parts
️ II. Key selection control elements
Section size limitation
For sections ≤80mm : 50Mn is preferred as the hardened layer is uniform after high-frequency quenching.
Section >80mm : Alloy steel such as 50Mn2 should be used instead to avoid insufficient hardness in the core.
Wear resistance requirements classification
Moderate wear : normalized hardness ≤217HB, suitable for low-speed transmission gears;
Severe wear : The depth of the hardened layer should be ≥3mm, and the surface hardness should be above HRC52 (such as friction discs of mining machinery).
Welding and machining constraints
Welding scenario : preheating at 200-300℃ + low-hydrogen electrode is necessary to avoid cold cracking;
Precision machining : hard alloy tools are required for annealed state cutting, and cold deformation needs to be controlled to prevent cracking.
III. Failure avoidance strategy
Overload risk : dynamic load parts must ensure a yield strength of ≥390MPa; otherwise, upgrade to 55Mn.
Fatigue failure : For components under alternating stress, there should be no decarburization layer on the surface, and 100% magnetic particle inspection should be conducted after quenching.
Brittle fracture : tempering is strictly prohibited in the range of 250-400℃ to prevent tempering brittleness.
Selection decision tree :
Load properties → Cross-sectional dimensions → surface hardness/core toughness requirements → process feasibility
Following this logical chain can maximize the balanced advantages of high strength and wear resistance of 50Mn.
